Luminescent device material, luminescent device using the same, and amine compound

[0004] The present invention relates to an organic luminescent device material used for a plane light source and a plane display, and to an organic luminescent device having high luminance. More specifically, the invention is concerned with a luminescent material capable of emitting a high-luminance light in the green to red region with high efficiency under a low applied voltage and a luminescent device using such a material. Further, the invention relates to novel compounds capable of producing fluorescence.

[0005] The organic luminescence devices utilizing organic substances have favorable prospects for the use as low-priced large-size full color display device of solid luminophor type, and have been developed in large numbers. In general, an organic luminescent device is constituted of a luminescent layer and a pair of facing electrodes between which the luminescent layer is sandwiched. The luminescence is a phenomenon that, when an electric field is impressed between both electrodes, the negative electrode emits electrons and the positive electrode emits positive holes and these electrons and positive holes are injected into a luminescent layer and recombined therein to return the energy level to the valence electron band from the conduction band, thereby liberating the energy as light.

[0006] Although conventional organic luminescent devices require high driving voltage and have low luminance and low luminous efficiency, the organic EL device comprising a lamination of thin films containing organic compounds which luminesce with high fluorescent quantum efficiency when a low voltage of 10 V or below is impressed thereon has recently been proposed (Applied Physics Letters, 51, p.913 (1987)) and much attention has been focused thereon. More specifically, such a device produces green luminescence of high luminance by using a metallic chelate complex in the electron-transporting layer, a fluorescent substance in the luminescent layer and an amine compound in a positive hole-transporting layer. Further, when the utilization of organic luminescent devices as full color display or light source is intended, the devices are required to give the three primary colors or white color from a practical point of view. Such being the case, the devices doped with fluorescent dyes to emit light of a desired color were reported (Journal of Applied Physics, vol. 65, p. 3610 (1989)). The technique adopted therein is effective particularly in the case of red luminescence where the density quenching is so serious that it is difficult to form a luminous layer with a fluorescent dye alone, and satisfactory color purity and high luminance are achieved thereby. However, it bears a problem such that, in producing the device doped with a dye by the use of an evaporation technique, a host material and a slight amount of fluorescent dye are co-evaporated; as a result, the operation is complicated and the devices produced tend to be uneven in performance. From the viewpoint of simplifying the production process and ensuring even performance for the products, therefore, it has been desired to develop luminescent materials having satisfactory color purity and enabling the formation of a luminescent layer with a dye alone, especially a red luminescent material which can achieve satisfactory chromaticity and high luminance even when it form a luminescent layer by itself.

[0007] On the other hand, although the organic luminescent devices which are successful in achieving high-luminance luminescence are devices comprising organic substances laminated by vacuum evaporation, the production of devices in accordance with a coating method is advantageous from the viewpoints of simplicity of the production process, processability and easiness of size expansion. However, the devices produced by conventional coating methods are inferior to the devices produced by evaporation methods in luminance and luminous efficiency, and so the big problem which confronts them is to achieve highly efficient luminescence having high luminance. Further, the device comprising a coating of the organic low molecular compound dispersed in an organic polymer medium has a problem that, when the device is made to luminesce for a long time, the planar luminescence of even quality becomes hard to obtain due to aggregation of the organic low molecular weight compound.

[0008] In recent years, various substances having fluorescence have also been used for filter dyes, color conversion filters, dyes for a photographic material, sensitizing dyes, pulp coloring dyes, laser dyes, fluorescent drugs for medical diagnosis and organic luminescent device materials, and the demands therefor have been growing. However, there are known only few red fluorescent dyes having strong fluorescence intensity and high color purity, and so the development of new materials has been desired.

[0009] A first object of the invention is to provide a luminescent device material and a luminescent device which can give off red luminescence of high color purity.

[0010] A second object of the invention is to provide a luminescent device material and a luminescent device which can give off high-luminance, even-quality, planar luminescence in the green to red region with high efficiency when it is driven at a low voltage, and further ensure steady performance upon repeated use.

[0011] A third object of the invention is to provide a device capable of ensuring consistent performance in every product thereof and a material which enables the production of such a device and the luminescence in the green to red region.

[0012] A fourth object of the invention is to provide a luminescent device material which enables the device to luminesce with high luminance and high efficiency even when it is produced by a coating method and a luminescent device using such a material.

[0013] A fifth object of the invention is to provide a compound capable of giving off fluorescence of high intensity in the green to red region.

[0014] A sixth object of the invention is to provide a luminescent device having a high thermal durability.

[0015] [1] A luminescent device material, comprising a compound represented by the following formula (I):

[0016] wherein R¹, R²and R³, which are the same or different, each represents an unsubstituted or substituted aryl group, an unsubstituted or substituted heterocyclic group or an unsubstituted or substituted aliphatic hydrocarbon group, provided that at least two among R¹, R²and R³are each an unsubstituted or substituted aryl or heterocyclic group; any two among R¹, R²and R³may combine with each other to complete a ring; provided that at least one among R¹, R²and R³has a moiety represented by the following formula (II),

[0017] wherein R⁴, R⁵and R⁶each represents a hydrogen atom or a substituent group, Z¹represents atoms (anatomic group) forming a 5, 6 or 7-membered ring, and m represents 0, 1 or 2.

[0018] [2] A luminescent device material according to Embodiment [1], wherein the compound of formula (I) is a compound represented by the following formula (III):

[0019] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group, or R¹and R²combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; Z¹¹represents atoms forming a 5, 6 or 7-membered ring; and m represents 0, 1 or 2.

[0020] [3] A luminescent device material according to Embodiment [2], wherein the compound of formula (III) is a compound represented by the following formula (IV):

[0021] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group, or R¹and R²combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; X_A1represents an oxygen atom, a sulfur atom, N—R_A1 or CR_A2R_A3; R_A1, R_A2 and R^A3 each represent a hydrogen atom or a substituent group; Z_A1represents atoms forming a 5, 6 or 7-membered ring; and m represents 0, 1 or 2.

[0022] [4] A luminescent device material according to Embodiment 3, wherein the compound of formula (IV) is a compound represented by the following formula (V):

[0023] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group, or R¹and R²combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; X_B1and X_B2each represent an oxygen atom, a sulfur atom, N—R_B1 or CR_B2R_B3; R_B1, R_B2 and R_B3 each represent a hydrogen atom or a substituent group; Z_B1represents atoms forming a 5, 6 or 7-membered ring, provided that the 5-membered ring formed by Z_B1is a substituted 1,3-indanedione nucleus, a heterocyclic ring-condensed cyclopenta-1,3-dione nucleus or a 3,5-pyrazolidinedione nucleus; and m represents 0, 1 or 2.

[0024] [5] A luminescent device material according to Embodiment [3], wherein the compound of formula (IV) is a compound represented by the following formula (VI):

[0025] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group, or R¹and R²combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; X_Crepresents an oxygen atom, a sulfur atom, N—R_C1 or CR_C2R_C3; R_C1, R_C2 and R_C3 each represent a hydrogen atom or a substituent group; Y_C1and Y_C2each represent a nitrogen atom or C—R_C4; R_C4 represents a hydrogen atom or a substituent group; Z_C1represents atoms completing a 5, 6 or 7-membered ring, provided that the 5-membered ring completed by Z_C1is an isooxazolinone nucleus, an oxazolinone nucleus, a furanone nucleus, an oxyindole nucleus or an imidazolidone nucleus; and m represents 0, 1 or 2.

[0026] [6] A luminescent device material according to Embodiment [3], wherein the compound of formula (IV) is a compound represented by the following formula (VII):

[0027] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group; R¹and R²may combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; X_Drepresents an oxygen atom, a sulfur atom, N—R_D1 or CR_D2R_D3; R_D1, R_D2 and R_D3 each represent a hydrogen atom or a substituent group; Z_D1represents atoms completing a 5, 6 or 7-membered ring; m represents 0, 1 or 2: and R_Drepresents a substituent group and d represents an integer of 0 to 4, wherein when d is 2, 3 or 4 the R_Dgroups are the same or different.

[0028] [7] A luminescent device material according to Embodiment [3], wherein the compound of formula (IV) is a compound represented by the following formula (VIII):

[0029] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group; R¹and R²may combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; X_Erepresents an oxygen atom, a sulfur atom, N—R_E1 or CR_E2R_E3; R_E1, R_E2 and R_E3 each represent a hydrogen atom or a substituent group; Y_E1and Y_E2each represent a nitrogen atom or C—R_E4; R_E4 represents a hydrogen atom or a substituent group; Z_E1represents atoms completing a 5, 6 or 7-membered ring; and m represents 0, 1 or 2.

[0030] [8] A luminescent device material according to Embodiment [3], wherein the compound of formula (IV) is a compound represented by the following formula (IX):

[0031] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group, R¹and R²may combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; X_F1and X_F2each represents an oxygen atom, a sulfur atom, N—R_F1 or CR_F2R_F3; R_F1, R_F2 and R_F3 each represent a hydrogen atom or a substituent group; Y_F1and Y_F2each represent an oxygen atom, a sulfur atom or N—R_F5; R_F5 represents a hydrogen atom or a substituent group; and m represents 0, 1 or 2.

[0032] [9] A luminescent device material according to Embodiment [3], wherein the compound of formula (IV) is a compound represented by the following formula (X):

[0033] wherein R¹and R², which are the same or different, each represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them is an aryl group or a heterocyclic group, or R¹and R²combine with each other to complete a ring; R⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R⁷groups are the same or different; R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group; X_Grepresents an oxygen atom, a sulfur atom, N—R_G1 or CR_G2R_G3; R_G1, R_G2 and R_G3 each represent a hydrogen atom or a substituent group; Y_G1and Y_G2each represent a nitrogen atom or C—R_G4; R_G4 represents a hydrogen atom or a substituent group; m₁represents 1 or 2; Z_G1represents atoms completing a 5, 6 or 7-membered ring; and m represents 0, 1 or 2.

[0034] [10] A styrylamine compound having a structure represented by the following formula (XI):

[0035] wherein R²¹and R²², which are the same or different, each represent an aryl group or a heterocyclic group, R²¹and R²²may combine with each other to form a ring; R²⁷represents a substituent group and n represents an integer of 0 to 4, wherein when n is 2, 3 or 4 the R²⁷groups are the same or different; R²⁶represents a hydrogen atom, an alkyl group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group; and Z²represents a 1,3-indanedione nucleus having substituent groups which combine with each other to complete a condensed ring or which are each an alkyl, aryl, heterocyclic, alkenyl or silyl group, a furanone nucleus, an oxyindole nucleus, an imidazolidone nucleus, a dioxobenzothophene-3-one nucleus, a coumaranone nucleus, a 1-indanone nucleus substituted at the 3-position by an alkyl, aryl or heterocyclic group, a benzofuran-3-one nucleus, a 2-thio-2,4-thiazolidinedione nucleus, a 2-thio-2,4-oxazolidinedione nucleus, a 2-thio-2,5-thiazolidinedione nucleus, a 2,4-thiazolidinedione nucleus, 2,4-imidazolidinedione nucleus, 2-thio-2,4-imidazolidinedione nucleus, a 2-imidazoline-5-one nucleus or a nucleus formed by replacing the carbonyl oxygen or the thiocarbonyl sulfur attached to the cyclic skeleton constituting Z²with N—R^2aor CR^2bR^2c, wherein R^2a, R^2band R^2ceach represent a hydrogen atom or a substituent group.

[0036] [11] A luminescent device material according to Embodiment [1], wherein the compound of formula (I) is a compound represented by the following formula (XII):

[0037] wherein Ar³¹represents an arylene group or a divalent heterocyclic group; R³²represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group; R³⁴, R³⁵and R³⁶each represent a hydrogen atom or a substitutent group; Z³represents atoms forming a 5, 6 or 7-membered ring; m represents 0, 1 or 2; t is an integer of at least 2, and one combination made with Ar³¹, R³², R³⁴, R³⁵, R³⁶, Z³and m is the same as or different from another combination made therewith; and L represents a t-valent linkage group.

[0038] [12] A luminescent device material according to Embodiment [1], wherein the compound of formula (I) is a compound represented by the following formula (XIII):

[0039] wherein Ar⁴¹represents an arylene group or a divalent heterocyclic group; R⁴²represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group; R⁴⁴, R⁴⁵and R⁴⁶each represent a hydrogen atom or a substitutent group; Z⁴represents atoms forming a 5, 6 or 7-membered ring; m represents 0, 1 or 2; p represents 2 or 3, and two or three combinations made with Ar⁴¹, R⁴², R⁴⁴, R⁴⁵, R⁴⁶, Z⁴and m are the same or different.

[0040] [13] A luminescent device material according to Embodiment [11], wherein the compound of formula (XII) is a compound represented by the following formula (XIV):

[0041] wherein R⁵⁴, R⁵⁵and R⁵⁶each represent a hydrogen atom or a substituent group; R⁵⁷and R⁵⁸each represent a substituent group; q represents an integer of 0 to 4, and when q is 2, 3 or 4 the R⁵⁷groups are the same or different; r represents an integer of 0 to 5, and when r is 2, 3, 4 or 5 the R⁵⁸groups are the same or different; Z⁵represents atoms forming a 5, 6 or 7-membered ring; m represents 0, 1 or 2; t represents an integer of at least 2, and one combination made with R⁵⁴, R⁵⁵, R⁵⁶, R⁵⁷, R⁵⁸, Z⁵, m, q and r is the same as or different from another combination made therewith; and L represents a t-valent linkage group.

[0042] [14] A luminescent device material according to Embodiment [12], wherein the compound of formula (XIII) is a compound represented by the following formula (XV):

[0043] wherein R⁶²represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group; R⁶⁴, R⁶⁵and R⁶⁶each represent a hydrogen atom or a substituent group; R⁶⁷represents a substituent group; q represents an integer of 0 to 4, and when q is 2, 3 or 4 the R⁶⁷groups are the same or different; Z⁶represents atoms forming a 5, 6 or 7-membered ring; m represents 0, 1 or 2; p represents 2 or 3, and two or three combinations made with R⁶², R⁶⁴, R⁶⁵, R⁶⁶, R⁶⁷, Z⁶, m and q are the same or different.

[0044] [15] A luminescent device material according to claim 13, wherein the compound of formula (XIV) is a compound represented by the following formula (XVI):

[0045] wherein R⁷⁴represents a hydrogen atom or a substituent group; R⁷⁷and R⁷⁸each represent a substituent group; q represents an integer of 0 to 4, and when q is 2, 3 or 4 the R⁷⁷groups are the same or different; r represents an integer of 0 to 5, and when r is 2, 3, 4 or 5 the R⁷⁸groups are the same or different; Z⁷represents atoms forming a 5, 6 or 7-membered ring; t represents an integer of at least 2, and one combination made with R⁷⁴, R⁷⁷, R⁷⁸, Z⁷, q and r is the same as or different from another combination made therewith; and L represents a t-valent linkage group.

[0046] [16] A luminescent device material according to Embodiment [15], wherein the compound of formula (XVI) is a compound represented by the following formula (XVII):

[0047] wherein R⁸⁴represents a hydrogen atom or a substituent group; R⁸⁷and R⁸⁸each represent a substituent group; q represents an integer of 0 to 4, and when q is 2, 3 or 4 the R⁸⁷groups are the same or different; r represents an integer of 0 to 5, and when r is 2, 3, 4 or 5 the R⁸⁸groups are the same or different; Z8 represents atoms forming a 5, 6 or 7-membered ring; X⁸represents an oxygen atom, a sulfur atom, N—R^A1or CR^A2R^A3; R^A1, R^A2and R^A3each represent a hydrogen atom or a substituent group; t represents an integer of at least 2, and one combination made with R⁸⁴, R⁸⁷, R⁸⁸, Z⁸, X⁸, q and r is the same as or different from another combination made therewith; and L represents a t-valent linkage group.

[0048] [17] A styrylamine compound having a structure represented by the following formula (XVIII):

[0049] wherein R⁹⁴represents a hydrogen atom or a substituent group; R⁹⁷and R⁹⁸each represent a substituent group; q represents an integer of 0 to 4, and when q is 2, 3 or 4 the R⁹⁷groups are the same or different; r represents an integer of 0 to 5, and when r is 2, 3, 4 or 5 the R⁹⁸groups are the same or different; Z⁹represents atoms forming a 5, 6 or 7-membered ring; X⁹represents an oxygen atom, a sulfur atom, N—R^A1or CR^A2R^A3; R^A1, R^A2and R^A3each represent a hydrogen atom or a substituent group; t represents an integer of at least 2, and one combination made with R⁹⁴, R⁹⁷, R⁹⁸, Z⁹, X⁹, q and r is the same as or different from another combination made therewith; and L represents a t-valent linkage group.

[0050] [18] A luminescent device having at least one layer of an organic thin film between electrodes, with the device comprising at least one of the compounds represented by formulae (I) and (III) to (XVIII) as defined in Embodiments [1] to [17] respectively.

[0051] [19] A luminescent device having at least one layer of an organic thin film between electrodes, with the device comprising at least one layer wherein at least one of the compounds represented by formulae (I) and (III) to (XVIII) as defined in claims 1 to17 respectively is dispersed in a polymer.

[0052] Firstly, the compound represented by the foregoing formula (I) is described below in detail.

[0053] R¹, R²and R³in formula (I) may be the same or different. And each of them represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least two of them are each an aryl group or a heterocyclic group.

[0054] Suitable examples of an aryl group represented by R¹, R²and R³each include monocyclic and bicyclic aryl groups containing 6 to 30 carbon atoms (such as phenyl and naphthyl groups), preferably phenyl and naphthyl groups containing 6 to 20 carbon atoms, particularly preferably phenyl and naphthyl groups containing 6 to 14 carbon atoms.

[0055] The heterocyclic group represented by R¹, R²and R³each is a 3- to 10-membered, saturated or unsaturated heterocyclic group containing at least one nitrogen, oxygen or sulfur atom. Such a heterocyclic ring may be a single ring, or a condensed ring formed by fusing together with another ring.

[0056] Suitable examples of a heterocyclic group include 5- to 6-membered aromatic heterocyclic groups, preferably nitrogen, oxygen or/and sulfur-containing 5- to 6-membered aromatic heterocyclic groups, particularly preferably 5- to 6-membered aromatic heterocyclic groups containing one to two nitrogen atoms or/and one to two sulfur atoms. Examples of such a heterocyclic ring include pyrrolidine, piperidine, piperazine, morpholine, thiophene, furan, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, phthalazine, naphthylizine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, phenanthroline, phenazine, tetrazole, benzimidazole, benzoxazole, benzothiazole, benzotriazole and tetraazaindene. Of these heterocyclic rings, thiophene, pyridine and quinoline are preferred over the others.

[0057] The aliphatic hydrocarbon groups represented by R¹, R²and R³each include straight-chain, branched or cyclic alkyl groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, such as methyl, ethyl, isopropyl, t-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl and cyclohexyl), alkenyl groups (containing preferably 2 to 20 carbon atoms, more preferably2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as vinyl, allyl, 2-butenyl and 3-pentenyl) and alkynyl groups (containing preferably 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as propargyl and 3-pentynyl). Of these groups, alkyl groups are preferred over the others.

[0058] The aryl, heterocyclic, or aliphatic hydrocarbon group represented by R¹, R²and R³each may have a substituent group. Examples of such a substituent group include alkyl groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, such as methyl, ethyl, iso-propyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl and cyclohexyl), alkenyl groups (containing preferably 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as vinyl, allyl, 2-butenyl and 3-pentenyl) alkynyl groups (containing preferably2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as propargyl and 3-pentynyl), aryl groups (containing preferably 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenyl, p-methylphenyl and naphthyl), amino groups (including an unsubstituted amino group and amino groups substituted, e.g., by alkyl, alkenyl, aralkyl, aryl or/and heterocyclic groups, and each containing preferably 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, particularly preferably 0 to 6 carbon atoms, such as amino, methylamino, dimethylamino, diethylamino, dibenzylamino and phenylamino), alkoxy groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, such as methoxy, ethoxy and butoxy), aryloxy groups (containing preferably 6 to 20 carbon atoms, more preferably 6 to 16 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenoxy and 2-naphthyloxy), acyl groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as acetyl, benzoyl, formyl and pivaroyl), alkoxycarbonyl groups (containing preferably 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as methoxycarbonyl and ethoxycarbonyl), aryloxycarbonyl groups (containing preferably 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, particularly preferably 7 to 10 carbon atoms, such as phenyloxycarbonyl), acyloxy groups (containing preferably 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as acetoxy and benzoyloxy), acylamino groups (containing preferably 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as acetylamino and benzoylamino), alkoxycarbonylamino groups (containing preferably 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as methoxycarbonylamino), aryloxycarbonylamino groups (containing preferably 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, particularly preferably 7 to 12 carbon atoms, such as phenyloxycarbonylamino), sulfonylamino groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methanesulfonylamino and benzenesulfonylamino), sulfamoyl groups (containing preferably 0 to 20 carbon atoms, more preferably 0 to 16 carbon atoms, particularly preferably 0 to 12 carbon atoms, such as sulfamoyl, methylsulfamoyl, dimethylsulfamoyl and phenylsulfamoyl), carbamoyl groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as carbamoyl, methylcarbamoyl, diethylcarbamoyl and phenylcarbamoyl), alkylthio groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methylthio and ethylthio), arythio groups (containing preferably 6 to 20 carbon atoms, more preferably 6 to 16 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenylthio), sulfonyl groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as mesyl and tosyl), sulfinyl groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methanesulfinyl and benzenesulfinyl), ureido groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as ureido, methylureido and phenylureido), phosphoric acid amido groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as diethylphosphoric acid amido and phenylphosphoric acid amido), a hydroxyl group, a mercapto group, halogen atoms (such as fluorine, chlorine, bromine and iodine atoms), a cyano group, a sulfo group, a carboxyl group, a nitro group, a hydroxamic acid group, a sulfino group, a hydrazino group, an imino group, heterocyclic groups (containing preferably 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, and further containing nitrogen, oxygen or/and sulfur atoms as hetero atom(s), such as groups derived from pyrrolidine, piperidine, piperazine, morpholine, thiophene, furan, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, phthalazine, naphthylizine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, phenanthroline, phenazine, tetrazole, benzimidazole, benzoxazole, benzothiazole, benzotriazole and tetraazaindene) and silyl groups (containing preferably 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably 3 to 24 carbon atoms, such as trimethylsilyl and triphenylsilyl). These substituent groups each may further be substituted. When two or more substituent groups are present, they may be the same or different and, if possible, may form a ring by combining with each other.

[0059] Of the substituent groups recited above, alkyl, alkenyl, aralkyl, aryl, alkoxy, amino, acyl, alkoxycarbonyl, aryloxycarbonyl, carbonylamino, sulfonylamino, sulfamoyl, carbamoyl, hydroxyl, silyl and heterocyclic groups are preferred over the other. Among these groups, alkyl, alkenyl, aralkyl, aryl, alkoxy, amino, carbonylamino, sulfonylamino, silyl and heterocyclic groups are more favorable. In particular, alkyl, alkenyl, aryl, alkoxy, substituted amino and silyl groups are advantageous over the others.

[0060] The term “substituted amino group” as used herein refers to the group represented by —NR_a(R_b), wherein R_aand R_bmay be the same or different and they each represent an alkyl group, an alkenyl group, an aralkyl group, an aryl group or a heterocyclic group.

[0061] Moreover, at least one among the groups R¹, R²and R³contains a moiety represented by the following formula (II).

[0062] The expression “contains a moiety represented by formula (II)” as used herein means that the substituent group of an aryl, heterocyclic or aliphatic hydrocarbon group represented by R¹, R²and R³each may be the moiety of formula (II) or may further be substituted by the moiety of formula (II).

[0063] The formula (II) is as follows:

[0064] wherein R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group, Z¹represents atoms forming a 5, 6 or 7-membered ring, and m represents 0, 1 or 2.

[0065] Further, any two among R⁴, R⁵and R⁶may combine with each other to complete a ring, or each of them may combine with R¹, R²or R³to complete a ring. Examples of a substituent group represented by R⁴, R⁵and R⁶each include the groups recited above as substituent groups which the aryl, heterocyclic or aliphatic hydrocarbon group represented by R¹, R²and R³each may have. It is desirable for m to be 0 or 1, particularly 0.

[0066] Z¹represents atoms forming a 5, 6 or 7-membered ring, which may have another ring in a fused state. Suitable examples of a ring formed by Z¹include rings employed as acidic nuclei in conventional merocyanine dyes.

[0067] The ring preferred as acidic nucleus represented by Z¹is a ring represented by the following formula (A):

[0068] wherein X_Arepresents an oxygen atom, a sulfur atom, N—R^A1or CR^A2R^A3, R^A1, R^A2and R^A3each represent a hydrogen atom or a substituent group, and Z^Arepresents atoms completing a 5, 6 or 7-membered ring, preferably constituted of any of carbon, nitrogen, oxygen and sulfur atoms.

[0069] The 5, 6 or 7-membered ring completed by Z^Amay further form a condensed ring.

[0070] To be concrete, R^A1represents a hydrogen atom, an aliphatic hydrocarbon group, an aryl group or a heterocyclic group.

[0071] The aliphatic hydrocarbon group represented by R^A1is a straight-chain, branched or cyclic alkyl group (containing preferably 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methyl, ethyl, iso-propyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl or cyclohexyl), an alkenyl group (containing preferably 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as vinyl, allyl, 2-butenyl or 3-pentenyl) or an alkynyl group (containing preferably 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as propargyl or 3-pentynyl), preferably an alkyl group or an alkenyl group, particularly preferably a methyl group, an ethyl group, a propyl group, a butyl group or an allyl group.

[0072] The aryl group suitable for R^A1is a monocyclic or bicyclic aryl group containing 6 ro 30 carbon atoms (e.g., phenyl or naphthyl), preferably a phenyl group containing 6 to 20 carbon atoms, particularly preferably a phenyl group containing 6 to 12 carbon atoms.

[0073] The heterocyclic group represented by R^A1is a group derived from a 3- to 10-membered saturated or unsaturated heterocyclic ring containing at least one nigrogen, oxygen or sulfur atom. Such a ring may be a single ring or a condensed ring formed by fusion with another ring.

[0074] The heterocyclic group suitable for R^A1is a 5 or 6-membered aromatic heterocyclic group, preferably a 5 or 6-membered nitrogen-containing aromatic heterocyclic group, particularly preferably a 5 or 6-membered aromatic heterocyclic group containing one or two nitrogen atoms. Examples of such a heterocyclic ring include pyrrolidine, piperidine, piperazine, morpholine, thiophene, furan, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, phthalazine, naphthylizine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, phenanthroline, phenazine, tetrazole, benzimidazole, benzoxazole, benzothiazole, benzotriazole and tetraazaindene. Of these rings, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, thiadiazole, oxadiazole, quinoline, phthalazine, quinoxaline, quinazoline, cinnoline, tetrazole, thiazole, oxazole, benzimidazole, benzoxazole, benzothiazole and benzotriazole are preferred over the others. In particular, pyridine and quinoline are advantageous over the others.

[0075] The aliphatic hydrocarbon group, the aryl group and the heterocyclic group represented by R^A1may have a substituent group, and examples of such a substituent group include those recited above as the substituent groups which R¹, R²and R³can have.

[0076] The group preferred as R_A1is an alkyl group, an alkenyl group or an aryl group, especially an alkyl group or a phenyl group.

[0077] The substituent group represented by R^A2and R^A3each include those recited above as the substituent groups which R¹, R²and R³each can have.

[0078] R^A2and R^A3each preferably represent a hydrogen atom, a cyano group, an oxycarbonyl group, an acyl group, a sulfonyl group, a thioether group, a carbamoyl group or a sulfamoyl group. Therein, however, the case of R^A2=R^A3=hydrogen atom is not included.

[0079] The oxycarbonyl group, the acyl group, the sulfonyl group and the thioether group which R^A2and R^A3each can represent are respectively oxycarbonyl, acyl, sulfonyl and thioether groups substituted by an aliphatic hydrocarbon, aryl or heterocyclic group. This aliphatic hydrocarbon, aryl or heterocyclic moiety of such groups each has the same meaning as the aliphatic hydrocarbon, aryl or heterocyclic group respectively which is illustrated above as a group represented by R^A1.

[0080] The carbamoyl group and the sulfamoyl group which R^A2and R^A3each can represent are unsubstituted or aliphatic hydrocarbon, aryl or heterocyclic group-substituted carbamoyl and sulfamoyl groups respectively. This substituted moiety of such groups each, namely an aliphatic hydrocarbon, aryl or heterocyclic group, has the same meaning as the aliphatic hydrocarbon, aryl or heterocyclic group respectively which is illustrated above as a group represented by R^A1.

[0081] Of the acidic nuclei represented by the foregoing formula (A), the nuclei represented by the following formula (B), (C), (D), (E), (F) or (G) are employed to advantage.

[0082] wherein X^B1and X^B2each represent an oxygen atom, a sulfur atom, N—R^B1or CR^B2R^B3, R^B1, R^B2and R^B3each represent a hydrogen atom or a substituent group, and Z^Brepresents atoms completing a 5, 6 or 7-membered ring, preferably constituted of any of carbon, nitrogen, oxygen and sulfur atoms. The 5- to 7-membered ring completed by Z^Bmay further form a condensed ring. R^B1, R^B2and R^B3have the same meanings as R^A1, R^A2and R^A3respectively. Examples of an acidic nucleus represented by formula (B) include 1,3-indanedione nuclei, heterocyclic ring-condensed cyclopenta-1,3-dione nuclei, 3,5-pyrazolinedione nuclei, 1,3-cyclohexanedione nuclei, 1,3-dioxane-4,6-dione nuclei and 2,4,6-triketohexahydropyrimidine nuclei (including barbituric or 2-thiobarbituric acid and derivatives thereof, such as a 1-alkyl body of barbituric or 2-thiobarbituric, e.g., the 1-methyl or 1-ethyl body thereof, a 1,3-dialkyl body of barbituric or 2-thiobarbituric acid, e.g., the 1,3-dimethyl, 1,3-diethyl or 1,3-dibutyl body thereof, a 1,3-diaryl body of barbituric or 2-thiobarbituric acid, e.g., the 1,3-diphenyl, 1,3-di(p-chlorophenyl) or 1,3-di(p-ethoxycarbonylphenyl) body thereof, a 1-alkyl-1-aryl body of barbituric or 2-thiobarbituric acid, e.g., the 1-ethyl-3-phenyl body thereof, and barbituric or 2-thiobarbituric acid substituted by heterocyclic groups at the 1- and 3-positions, e.g., the 1,3-di(2-pyridyl) body of barbituric or 2-thiobarbituric acid).

[0083] More specifically, the nuclei illustrated below and derivatives thereof are suitable examples of acidic nuclei represented by formula (B):

[0084] wherein X^Crepresents an oxygen atom, a sulfur atom, N—R^C1or CR^C2R^C3; R^C1, R^C2and R^C3each represent a hydrogen atom or a substituent group; Y^C1and Y^C2each represent a nitrogen atom or C—R^C4; R^C4represents a hydrogen atom or a substituent group, examples of which include the groups recited above as substituent groups of R¹, R²and R³each; and Z^Crepresents atoms completing a 5, 6 or 7-membered ring, preferably constituted of any of carbon, nitrogen, oxygen and sulfur atoms, which may further form a condensed ring. Additionally, R^C1, R^C2and R^C3have the same meanings as the foregoing R^A1, R^A2and R^A3respectively.

[0085] Examples of an acidic nucleus represented by formula (C) include pyrazolone nuclei, isooxazolinone nuclei, oxazolinone nuclei, furanone nuclei, oxyindole nuclei, imidazolidone nuclei and 1,2,3,6-tetrahydropyridine-2,6-dione nuclei.

[0086] More specifically, the nuclei illustrated below and derivatives thereof are recited as acidic nuclei of formula (C)

[0087] wherein X^Drepresents an oxygen atom, a sulfur atom, N—R^D1or CR^D2R^D3, R^D1, R^D2and R^D3each represents a hydrogen atom or a substituent group, and Z^Drepresents atoms completing a 5, 6 or 7-membered ring, preferably constituted of any of carbon, nitrogen, oxygen and sulfur atoms. Additionally, R^D1, R^D2and R^D3have the same meanings as the foregoing R^A1, R^A2and R^A3respectively.

[0088] Examples of an acidic nucleus represented by formula (D) include the nuclei illustrated below and derivatives thereof.

[0089] wherein X^Erepresents an oxygen atom, a sulfur atom, N—R^E1or CR^E2R^E3; R^E1, R^E2and R^E3each represent a hydrogen atom or a substituent group; Y^E1and Y^E2each represent a nitrogen atom or C—R^E4; R^E4represents a hydrogen atom or a substituent group, examples of which include the groups recited above as substituent groups of R¹, R²and R³each; and Z^Erepresents atoms completing a 5, 6 or 7-membered ring, preferably constituted of any of carbon, nitrogen, oxygen and sulfur atoms, which may further form a condensed ring. Additionally, R^E1, R^E2and R^E3have the same meanings as the foregoing R^A1, R^A2and R^A3respectively.

[0090] Examples of an acidic nucleus represented by formula (E) include the nuclei illustrated below and derivatives thereof.

[0091] wherein X^F1and X^F2each represent an oxygen atom, a sulfur atom, N—R^F1or CR^F2R^F3, R^F1, R^F2and R^F3each represent a hydrogen atom or a substituent group, and Y^F1and Y^F2each represent a nitrogen atom or C—R^F5. Additionally, R^F1and R^F5each have the same meaning as the foregoing R^A1, and R^F2and R^F3have the same meanings as R^A2and R^A3respectively. Examples of an acidic nucleus of formula (F) include 2-thio-2,4-thiazolidinedione nuclei (such as rhodanine and derivatives thereof, with examples including rhodanines substituted by an aliphatic hydrocarbon group at the 3-position, such as 3-methylrhodanine, 3-ethylrhodanine and 3-allylrhodanine, those substituted by an aryl group at the 3-position, such as 3-phenylrhodanine, and those substituted by a heterocyclic group at the 3-position, such as 3-(2-pyridyl)rhodanine), 2-thio-2,4-oxazolidinedinone nuclei, 2-thio-2,4-(3H,5H)-oxazoledione nuclei, 2-thio-2,5-thiazolidinedione nuclei, 2,4-thiazolidinedione nuclei, thiazoline-4-one nuclei, 4-thiazolidinone nuclei, 2,4-imidazolidinedione (hydantoin) nuclei, imidazoline-5-one nuclei, and analogues thereof. More specifically, the nuclei illustrated below are recited as acidic nuclei of formula (F).

[0092] wherein X^Grepresents an oxygen atom, a sulfur atom, N—R^G1or CR^G2R^G3; R^G1, R^G2and R^G3each represent a hydrogen atom or a substituent group; Y^G1and Y^G2each represent a nitrogen atom or C—R^G4; R^G4represents a hydrogen atom or a substituent group, examples of which include the groups recited above as substituent groups of R¹, R²and R³each; m₁represents 1 or 2; and Z^Grepresents atoms completing a 5, 6 or 7-membered ring, preferably constituted of any of carbon, nitrogen, oxygen and sulfur atoms, which may further form a condensed ring. Additionally, R^G1, R^G2and R^G3have the same meanings as the foregoing R^A1, R^A2and R^A3respectively.

[0093] Examples of an acidic nucleus represented by formula (G) include the nuclei illustrated below.

[0094] Further, one of acidic nuclei represented by formula (A) and another of them may undergo condensation at the site of ═X^A. To take the case of a rhodanine nucleus represented by formula (F) in illustration, the following nuclei can be adduced as examples of such condensation.

[0095] As suitable examples of acidic nuclei represented by formula (A), preferably including acidic nuclei of formulae (B) to (G), mention may be made of 1,3-indanedione nuclei, 3,5-pyrazolinedione nuclei, 1,3-cyclohezanedione nuclei (including their thioketone bodies), 1,3-dioxane-4,6-dione nuclei, 2,4,6-triketohexahydropyrimidine nuclei (including their thioketone bodies), pyrazolone nuclei, isooxazolinone nuclei, oxazolinone nuclei, furanone nuclei, oxyindole nuclei, inidazolidone nuclei, 1,2,3,6-tetrahydropyridine-2,6-dione nuclei, benzothiophene-3-one nuclei, oxobenzothiophene-3-one nuclei, dioxobenzothiophene-3-one nuclei, coumaranone nuclei, 1-indanone nuclei, α-tetralone nuclei, 2-thio-2,4-thiazolidinedione nuclei, 2-thio-2,4-oxazolidinedione nuclei, 2-thio-2,5-thiazolidinedione nuclei, 2,4-thiazolidinedione nuclei, 2,4-imidazolidinedione nuclei, 2-thio-2,4-imidazolidinedione nuclei and 2-imidzoline-5-one nuclei. Of these nuclei, 1,3-indanedione nuclei, 2,4,6-triketohexahydropyrimidine nuclei (including their thioketone bodies), pyrazolone nuclei, isooxazolinone nuclei, oxazolinone nuclei, furanone nuclei, oxyindole nuclei, 1-indaznone nuclei, imidazolidone nuclei, 1,2,3,6-tetrahydropyridine-2,6-dione nuclei, benzothiophene-3-one nuclei, oxobenzothiophene-3-one nuclei, dioxobenzothiophene-3-one nuclei, coumaranone nuclei, 2-thio-2,4-thiazolidinedionenuclei, 2-thio-2,4-oxazolidinedionenuclei, 2-thio-2,5-thiazolidinedione nuclei and 2,4-thiazolidinedione nuclei are preferred over the others. In particular, 1,3-indanedione nuclei, barbituric acid derivatives, 2-thiobarbituric acid derivatives, pyrazolone nuclei, isooxazolinone nuclei, oxazolinone nuclei, furanone nuclei, 1-indanone nuclei, imidazolidone nuclei, 1,2,3,6-tetrahydropyridine-2,6-dione nuclei, oxobenzothiophene-3-one nuclei, dioxobenzothiophene-3-one derivatives, 2-thio-2,4-thiazolidinedione nuclei and 2-thio-2,4-oxazolidinedione nuclei are advantageous over the others.

[0096] Next, the compound represented by formula (III) is described below in detail.

[0097] R¹and R²in Formula (III) may be the same or different, and they each represent an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, provided that at least either of them represents an aryl or heterocyclic group.

[0098] The aryl group, heterocyclic group or aliphatic hydrocarbon group represented by R¹and R²in Formula (III) is the same as the aryl group, heterocyclic group or aliphatic hydrocarbon group represented by R¹, R²and R³in Formula (I)

[0099] Additionally, R¹and R²may combine with each other to complete a 5, 6 or 7-membered ring.

[0100] R⁷represents a substituent group and n represents an integer of 0 to 4. When n is 2, 3 or 4, two to four R₃groups may be the same or different. R⁴, R⁵and R⁶each represent a hydrogen atom or a substituent group. Any two of the substituent groups R⁴, R⁵, R⁶and R⁷may be combined with each other to complete a ring. Examples of these substituent groups include the groups recited above as the substituent groups which the aryl, heterocyclic or aliphatic hydrocarbon group represented by R¹and R²each can have. m represents 0, 1 or 2.

[0101] It is desirable that m be 0 or 1, preferably 0.

[0102] Z¹¹represents atoms forming a 5, 6 or 7-membered ring, which may have another ring in a fused state. Suitable examples of the ring formed include rings employed as acidic nuclei in conventional merocyanine dyes. Of such nuclei, the acidic nuclei represented by formulae (A1) to (G1) respectively, which are illustrated hereinafter, are preferred over the others.

[0103] Next, the compound represented by formula (IV) is illustrated below.

[0104] R¹, R², R⁴to R⁷, m and n in formula (IV) have the same meanings as in formula (III), respectively. The acidic nucleus in formula (IV), which is derived from a cyclic compound of the following formula (A1) , is a preferable one among all the acidic nuclei which can be represented by Z¹¹in formula (III);

[0105] wherein X_Arepresents an oxygen atom, a sulfur atom, N—R_A1 or CR_A2R_A3; R_A1, R_A2 and R_A3 each represent a hydrogen atom or a substituent group; and Z_A1represents atoms forming a 5, 6 or 7-membered ring, preferably a 5, 6 or 7-membered ring constituted of any of carbon, nitrogen, oxygen and sulfur atoms.

[0106] It is desirable that the substituent group represented by R_A1 be an aliphatic hydrocarbon group, an aryl group or a heterocyclic group.

[0107] The aliphatic hydrocarbon group represented by R_A1 is a straight-chain, branched or cyclic alkyl group (containing preferably 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methyl, ethyl, iso-propyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl or cyclohexyl), an alkenyl group (containing preferably 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as vinyl, allyl, 2-butenyl or 3-pentenyl) or an alkynyl group (containing preferably 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as propargyl or pentynyl), preferably an alkyl group or an alkenyl group, more preferably methyl, ethyl, propyl, butyl or allyl group.

[0108] The aryl group represented by R_A1 is preferably a monocyclic or bicyclic aryl group containing 6 to 30 carbon atoms (such as phenyl or naphtyl), more preferably a phenyl group containing 6 to 20 carbon atoms, particularly preferably a phenyl group containing 6 to 12 carbon atoms.

[0109] The heterocyclic group represented by R_A1 is a saturated or unsaturated 3- to 10-membered heterocyclic group containing at least one N, O or S atom. The heterocyclic ring therein may be a single ring or may further be fused with another ring to form a condensed ring.

[0110] It is desirable that the heterocyclic group be a 5 or 6-membered aromatic heterocyclic group, preferably a nitrogen-containing 5 or 6-membered aromatic heterocyclic group, particularly preferably a 5 or 6-membered aromatic heterocyclic group containing one to two nitrogen atoms.

[0111] As examples of heterocyclic rings from which the foregoing heterocyclic groups are derived, mention may be made of pyrrolidine, piperidine, piperazine, morpholine, thiophene, furan, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, phthalazine, naphthylizine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, phenanthroline, phenazine, tetrazole, benzimidazole, benzoxazole, benzothiazole, benzotriazole and tetraazaindene. Of these heterocyclic rings, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, thiadiazole, oxadiazole, quinoline, phthalazine, quinoxaline, quinazoline, cinnoline, tetrazole, thiazole, oxazole, benzimidazole, benzoxazole, benzothiazole and benzotriazole are preferred over the others. Further, imidazole, pyridine, quinoline, thiazole, oxazole, benzoimidazole, benzoxazole, benzothiazole and benzotriazole, especially pyridine and quinoline, are advantageous.

[0112] The aliphatic hydrocarbon, aryl or heterocyclic group represented by R_A1 may have a substituent group. Examples of such a substituent group include the groups recited above as a substituent group which R¹and R²each can have.

[0113] The groups preferred as R_A1 are an alkyl group, an alkenyl group and an aryl group, especially alkyl and phenyl groups.

[0114] R_A2 and R_A3 each are preferably a hydrogen atom, a cyano group, an oxycarbonyl group, an acyl group, a sulfonyl group, a thioether group, a carbamoyl group or a sulfamoyl group (excluding the case of R_A2=R_A3=a hydrogen atom).

[0115] The oxycarbonyl, acyl, sulfonyl or thioether group represented by R_A2 and R_A3each is respectively an oxycarbonyl, acyl, sulfonyl or thioether group substituted by an aliphatic hydrocarbon, aryl or heterocyclic group. These aliphatic hydrocarbon, aryl and heterocyclic substituents have the same meanings as the foregoing aliphatic hydrocarbon, aryl and heterocyclic groups R_A1 can represent, respectively.

[0116] The carbamoyl or sulfamoyl group represented by R_A2 and R_A3 each is respectively a carbamoyl or sulfamoyl group having no substituent or an aliphaptic hydrocarbon, aryl or heterocyclic substituent. These aliphatic hydrocarbon, aryl and heterocyclic substituents have the same meanings as the foregoing aliphatic hydrocarbon, aryl and heterocyclic groups R_A1 can represent, respectively.

[0117] Next, the compound represented by formula (V) is illustrated below.

[0118] R¹, R², R⁴to R⁶, m and n in formula (V) have the same meanings as in formula (III), respectively. The acidic nucleus in formula (V), which is derived from a cyclic compound represented by the following formula (B1), is favorable one among all the acidic nuclei which can be represented by formula (A1):

[0119] wherein X_B1and X_B2each represent an oxygen atom, a sulfur atom, N—R_B1 or CR_B2R_B3; R_B1, R_B2 and R_B3 each represent a hydrogen atom or a substituent group; and Z_B1represents atoms forming a 5, 6 or 7-membered ring, preferably a 5, 6 or 7-membered ring constituted of any of carbon, nitrogen, oxygen and sulfur atoms. R_B1, R_B2 and R_B3 have the same meanings as the aforementioned R_A1, R_A2 and R_A3 respectively. Examples of an acidic nucleus represented by formula (B1) include substituted 1,3-indanedione nuclei, heterocyclic ring-condensed cyclopenta-1,3-dione nuclei (the heterocyclic ring of which is, e.g., pyridine, pyrazine or thiophene), 3,5-pyrazolinedione nuclei, 1,3-cyclohexanedione nuclei, 1,3-dioxane-4,6-dione nuclei, 2,4,6-triketohexahydropyrimidine nuclei [e.g., barbituric acid, 2-thiobarbituric acid, and derivatives thereof, such as those substituted by an alkyl group (e.g., methyl, ethyl) at the 1-position, those substitutedbyalkyl groups (e.g., methyl, ethyl, butyl) at the 1- and 3-positions respectively, those substituted by aryl groups (e.g., phenyl, p-chlorophenyl), p-ethoxycarbonylphenyl) at the 1- and 3-positions respectively, those substituted by alkyl and aryl groups at the 1- and 3-positions (e.g., 1-ethyl-3-phenylbarbituric acid, 1-ethyl-3-phenyl-2-thiobarbituric acid), and those substituted by heterocyclic groups at the 1- and 3-positions respectively (e.g., 1,3-di(2-pyridyl)barbituric acid, 1,3-di(2-pyridyl)-2-thiobarbituric acid)].

[0120] More specifically, the acidic nucleus represented by formula (B1) include the compounds illustrated below and derivatives thereof. Additionally, the term “a substituted 1,3-indanedione nucleus” refers to the 1,3-indanedione nucleus having a substituent group or another ring condensed thereon.

[0121] Examples of such a substituent group include an alkyl group, an aryl group, a heterocyclic group, an alkenyl group and a silyl group.

[0122] Next, the compound represented by formula (VI) is illustrated below.

[0123] R¹, R², R⁴to R⁶, m and n in formula (VI) have the same meanings as in formula (III), respectively. The acidic nucleus in formula (VI), which is derived from a cyclic compound represented by the following formula (C1), is favorable one among all the acidic nuclei which can be represented by formula (A1):

[0124] wherein X_Crepresents an oxygen atom, a sulfur atom, N—R_C1 or CR_C2R_C3; R_C1, R_C2 and R_C3 each represent a hydrogen atom or a substituent group; Y_C1and Y_C2each represent a nitrogen atom or C—R_C4; R_C4 represents a hydrogen atom or a substituent group, examples of which include the groups recited hereinbefore as substituent groups R₁and R₂may have; and Z_C1represents atoms completing a 5, 6 or 7-membered ring, preferably a 5, 6 or 7-membered ring constituted of any of carbon, nitrogen, oxygen and sulfur atoms. R_C1, R_C2 and R_C3 have the same meanings as R_A1, R_A2 and R_A3 respectively.

[0125] Examples of an acidic nucleus represented by formula (C1) include an isooxazolinone nucleus, an oxazolinone nucleus, a furanone nucleus, an oxyindole nucleus, an imidazolidone nucleus and a 1,2,3,6-tetrahydropyridine-2,6-dione nucleus. More specifically, these nuclei include the compounds illustrated below and derivatives thereof.

[0126] Further, the compound represented by formula (VII) is illustrated below.

[0127] R¹, R², R⁴to R⁶, n and m in formula (VII) have the same meanings as in formula (III), respectively. The acidic nucleus in formula (VII), which is derived from a cyclic compound represented by the following formula (D1), is favorable one among all the acidic nuclei which can be represented by formula (A1):

[0128] wherein X_Drepresents an oxygen atom, a sulfur atom, N—R_D1 or CR_D2R_D3; R_D1, R_D2 and R_D3 each represent a hydrogen atom or a substituent group, and they have the same meaning as R_A1, R_A2 and R_A3 respectively; Z_D1represents atoms completing a 5, 6 or 7-membered ring, preferably a 5, 6 or 7-membered ring constituted of any of carbon, nitrogen, oxygen and sulfur atoms; and R_Drepresents a substituent group, including the substituent groups recited hereinbefore R¹and R²may have; and d represents an integer of 0 to 4, wherein when d is 2, 3 or 4 the R_Dgroups are the same or different. Examples of an acidic nucleus represented by formula (D1) include the following cyclic compounds and derivatives thereof.

[0129] Furthermore, the compound represented by formula (VIII) is illustrated below.

[0130] R¹, R², R⁴to R⁶, n and m in formula (VIII) have the same meanings as in formula (III), respectively. The acidic nucleus in formula (VIII), which is derived from a cyclic compound represented by the following formula (E1), is favorable one among all the acidic nuclei which can be represented by formula (A1):

[0131] wherein X_Erepresents an oxygen atom, a sulfur atom, N—R_E1 or CR_E2R_E3; R_E1, R^E2 and R_E3 each represent a hydrogen atom or a substituent group; Y_E1and Y_E2each represent a nitrogen atom or C—R_E4; R_E4 represents a hydrogen atom or a substituent group, examples of which include the groups recited hereinbefore as substituent groups R₁and R₂may have; and Z^E1represents atoms completing a 5, 6 or 7-membered ring, preferably a 5, 6 or 7-membered ring constituted of any of carbon, nitrogen, oxygen and sulfur atoms. R_E1, R_E2 and R_E3 have the same meanings as R_A1, R_A2 and R_A3 respectively.

[0132] Examples of an acidic nucleus represented by formula (E1) include the following cyclic compounds and derivatives thereof.

[0133] Then, the compound represented by formula (IX) is illustrated below.

[0134] R¹, R², R⁴to R⁶, n and m in formula (IX) have the same meanings as in formula (III), respectively. The acidic nucleus in formula (IX), which is derived from a cyclic compound represented by the following formula (F1), is favorable one among all the acidic nuclei which can be represented by formula (A1):

[0135] wherein X_F1and X_F2each represents an oxygen atom, a sulfur atom, N—R_F1 or CR_F2R_F3; R_F1, R_F2 and R_F3 each represent a hydrogen atom or a substituent group; Y_F1and Y_F2each represent an oxygen atom, a sulfur atom or N—R_F5; R_F1 and R_F5 each have the same meaning as R_A1; and R_F2 and R^F3have the same meanings as R_A2 and R_A3 respectively.

[0136] As examples of an acidic nucleus represented by formula (F1), mention may be made of 2-thio-2,4-thiazolidinedione nuclei (including rhodanine and derivatives thereof, e.g., a rhodanine substituted by an aliphatic hydrocarbon group at the 3-position, such as 3-methylrhodanine, 3-ethylrhodanine or 3-allylrhodanine, a rhodanine substituted by an aryl group at the 3-position, such as 3-phenylrhodanine, and a rhodanine substituted by a heterocyclic group at the 3-position, such as 3- (2-pyridyl)rhodanine), 2-thio-2,4-oxazolidinedione nuclei, 2-thio-2,4-(3H,5H)-oxazoledione nuclei, 2-thio-2,5-thiazolidinedione nuclei, 2,4-thiazolidinedione nuclei, thiazoline-4-one nuclei, 4-thiazolidinone nuclei, 2,4-imidazolidinedione (hydantoin) nuclei, 2-thio-2,4-imidazolidinedione (2-thiohydantoin) nuclei, imidazoline-5-one nuclei and analogues thereof.

[0137] More specifically, the heterocyclic compounds illustrated below are included in the acidic nuclei represented by formula (F1):

[0138] In addition, the compound represented by formula (X) is illustrated below.

[0139] R¹, R², R⁴to R⁶, n and m in formula (X) have the same meanings as in formula (III), respectively. The acidic nucleus in formula (X), which is derived from a cyclic compound represented by the following formula (G1), is favorable one among all the acidic nuclei which can be represented by formula (A1):

[0140] wherein X_Grepresents an oxygen atom, a sulfur atom, N—R_G1 or CR_G2R_G3; R_G1, R_G2 and R_G3 each represent a hydrogen atom or a substituent group; Y_G1and Y_G2each represent a nitrogen atom or C—R_G4; R_G4 represents a hydrogen atom or a substituent group, examples of which include the groups recited hereinbefore as substituent groups R¹and R²may have; m₁represents 1 or 2; Z_G1represents atoms completing a 5, 6 or 7-membered ring, preferably a 5, 6 or 7-membered ring constituted of any of carbon, nitrogen, oxygen and sulfur atoms. Additionally, R_G1, R_G2 and R_G3 have the same meanings as R_A1, R_A2 and R_A3 defined hereinbefore, respectively.

[0141] Examples of an acidic nucleus represented by formula (G1) are as follows:

[0142] Besides the acidic nuclei as recited above, the 5, 6 or 7-membered ring represented by Z¹¹in formula (III) may be an acidic nucleus formed by condensing the moiety=X_Ain formula (A1) and an acidic nucleus represented by formula (A1). To take examples from the rhodanine nuclei represented by formula (F1), the acidic nuclei formed by such a condensation are as follows;

[0143] Suitable examples of acidic nuclei represented by formulae (A1) to (G1) include substituted 1,3-indanedione nuclei, heterocyclic ring-condensed cyclopentane-1,3-dione nuclei, 3,5-pyrazolinedionedione nuclei, 1,3-cyclohexanedione nuclei (including thioketone bodies), 1,3-dioxane-4,6-dione nuclei, 2,4,6-triketohexahydropyrimidine nuclei, isooxazolinone nuclei, oxazolinone nuclei, furanone nuclei, oxyindole nuclei, imidazolidone nuclei, 1,2,3,6-tetrahydropyridine-2,6-dione nuclei, benzothiophene-2-one nuclei, oxobenzothiophene-3-one nuclei, dioxobenzothiophene-3-one nuclei, coumaranone nuclei, 1-indanone nuclei, α-tetralone nuclei, 2-thio-2,4-thiazolidinedione nuclei, 2-thio-2,5-thiazolidinedione nuclei, 2,4-thiazolidinedione nuclei, 2,4-imidazolidinedione nuclei, 2-thio-2,4-imidazoolidinedione nuclei and 2-imidzoline-5-one nuclei. Of these nuclei, the preferable nuclei are substituted 1,3-indanedione nuclei, 2,4,6-triketohexahydropyrimidine nuclei (including thioketo bodies), isooxazolinone nuclei, oxazolinone nuclei, furanone nuclei, oxyindone nuclei, imidazolidone nuclei, 1,2,3,6-tetrahydropyridine-2,6-dione nuclei, benzothiophene-3-one nuclei, oxobenzothiophene-3-one nuclei, dioxobenzothiophene-3-one nuclei, coumaranone nuclei, oxyindole nuclei, 1-indanone nuclei, 2-thio-2,4-thiazolidinedione nuclei, 2-thio-2,4-oxazolidinedione nuclei, 2-thio-2,5-thiazolidinedione nuclei and 2,4-thiazolidinedione nuclei. In particular, substituted 1,3-indanedione nuclei, barbituric acid derivatives, 2-thiobarbituric acid derivatives, isooxazolinone nuclei, oxazolinone nuclei, furanone nuclei, imidazolidone nuclei, 1,2,3,6-tetrahydropyridine-2,6-dione nuclei, oxobenzothiophene-3-one nuclei, dioxoobenzothiophene-3-one nuclei, 1-indanone nuclei, 2-thio-2,4-thiazolidinedione nuclei and 2-thio-2,4-oxazolidinedione nuclei are advantageous.

[0144] Next, styrylamine compounds represented by formula (XI) are illustrated below.

[0145] R²¹and R²²each in formula (III) have the same meaning as the aryl or heterocyclic group represented by R¹and R²each in formula (III). Favorable ranges of these groups are the same in both formulae. R²⁷has the same meaning as R⁷in formula (III). Z²represents a 1,3-indanedione nucleus having one or more substituent groups (which may complete a condensed nucleus or each represent an alkyl, aryl, heterocyclic, alkenyl or silyl group), a furanone nucleus, an oxyindole nucleus, an imidazolidone nucleus, a dioxobenzothophene-3-one nucleus, a coumaranone nucleus, an oxyindole nucleus, a 1-indanone nucleus having a substituent at the 3-position (wherein the substituent is an alkyl, aryl or heterocyclic group), a benzofuran-3-one nucleus, a 2-thio-2,4-thiazolidinedione nucleus, a 2-thio-2,4-oxazolidinedione nucleus, a 2-thio-2,5-thiazolidinedione nucleus, a 2,4-thiazolidinedione nucleus, 2,4-imidazolidinedione nucleus, 2-thio-2,4-imidazolidinedione nucleus or a 2-imidazoline-5-one nucleus. The carbonyl oxygen or the thiocarbonyl sulfur attached to the cyclic skeleton constituting Z²may be replaced with N—R^2aor CR^2bR^2c, wherein R^2a, R^2band R^2ceach represent a hydrogen atom or a substituent group, and they have the same meanings as R_A1, R_A2 and R_A3 in formula (IV) respectively.

[0146] The nuclei preferred as Z²include a 1,3-indanedione nucleus having one or more substituent groups (which may complete a condensed ring, such as a carbon or heterocyclic ring containing at most 20 carbon atoms, or each represent a 1-20C alkyl, 6-20C aryl, 1-20C heterocyclic or 2-30C alkenyl group), a dioxobenzothiophene-3-one nucleus, a benzofuran-3-one nucleus, a 1-indanone nucleus having a substituent at the 3-position (the substituent of which is a 1-20C alkyl, 6-20C aryl or 1-20C heterocyclic group) and a 2-thio-2,4-thiazolidinedione nucleus.

[0147] Then, the formula (XII) representing an amine compound is illustrated below in detail.

[0148] Ar³¹represents an arylene group or a divalent heterocyclic group, and R³²represents an aryl group, a heterocyclic group and an aliphatic hydrocarbon group. These aryl, heterocyclic and aliphatic hydrocarbon groups have the same meanings as those represented by R¹, R²and R³each in formula (I), respectively. Favorable ranges of these groups are the same in both formulae.

[0149] R³⁴, R³⁵, R³⁶and Z³have the same meanings as R⁴, R⁵, R⁶and Z¹in formula (II), respectively. m represents 0, 1 or 2. t represents an integer of at least 2. One combination made with Ar³¹, R³², R³⁴, R³⁵, R³⁶, Z³and m may be the same as or different from another combination made therewith. L represents a t-valent linkage group.

[0150] The suitable linkage group for L is a group constituted of at least one fragment selected from the class consisting of an oxygen atom, a nitrogen atom, a sulfur atom, a methylene group, a vinylene group, an acetylene group, a phenylene group, an aniline group and a heterocyclic group. The groups recited above may have a substituent, and those cyclic groups each may form a condensed ring by fusing together with another ring. The suitable number of carbon atoms contained in the foregoing heterocyclic group is from 1 to 20, preferably from 1 to 12, and examples of a hetero atom contained therein include nitrogen, oxygen, sulfur and selenium atoms. To be concrete, such a heterocyclic group includes the groups derived from pyrrolidine, piperidine, piperazine, morpholine, thiophene, selenophene, furan, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, phthalazine, naphthylizine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, phenanthroline, phenazine, tetrazole, benzimidazole, benzoxazole, benzothiazole, benzotriazole and tetrazaindene. And the foregoing substituent includes the groups recited as substituent groups which R¹, R²and R³can have.

[0151] It is desirable for L to be a group constituted of at least one fragment selected from the class consisting of an oxygen atom, a nitrogen atom, a sulfur atom, a methylene group, a vinylene group, an acetylene group and groups derived from aniline, benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole and oxadiazole nuclei respectively. These nuclei each may form a condensed ring.

[0152] In particular, the mono- to polymers, preferably the mono- to eicosamers, more preferably the mono- to decamers, particularly preferably the mono- to pentamers, of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneetynylene, arylenephenylene and triarylamine respectively (wherein the arylene moiety and the aryl moiety include the groups derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole and oxadiazole respectively) are preferred as L, and thereto an oxygen atom, a nitrogen atom, a sulfur atom or a methylene group may be attached as a linking moiety.

[0153] The formula (XIII) representing another amine compound is illustrated below.

[0154] Ar⁴¹represents an arylene group or a divalent heterocyclic group, and R⁴²represents an aryl group, a heterocyclic group and an aliphatic hydrocarbon group. R⁴⁴, R⁴⁵and R⁴⁶each represent a hydrogen atom or a substituent group. These Ar⁴¹, R⁴², R⁴⁴, R⁴⁵, R⁴⁶and Z⁴have the same meanings as Ar³¹, R³², R³⁴, R³, R³⁶and Z³in formula (XII), respectively. m represents 0, 1 or 2. p represents 2 or 3. One combination made with Ar⁴¹, R⁴², R⁴⁴, R⁴⁵, R⁴⁶, Z⁴and m may be the same as or different from another combination made therewith.

[0155] Then, the formula (XIV) is described below. R⁵⁴, R⁵⁵and R⁵⁶each represent a hydrogen atom or a substituent group. R⁵⁷and R⁵⁸each represent a substituent group. q represents an integer of 0 to 4, and r represents an integer of 0 to 5. When q is 2, 3 or 4, the R⁵⁷groups may be the same or different; while, when r is 2, 3, 4 or 5, the R⁵⁸groups may be the same or different. Examples of a substituent group represented by R⁵⁴, R⁵⁵, R⁵⁶, R⁵⁷and R⁵⁸each include the groups recited above as substituents which the aryl, heterocyclic or aliphatic hydrocarbon group represented by R¹, R²and R³each can have. Z⁵represents atoms forming a 5, 6 or 7-membered ring, and has the same meaning as Z¹in formula (II). m represents 0, 1 or 2. t represents an integer of at least 2. One combination made with R⁵⁴, R⁵⁵, R⁵⁶, R⁵⁷, R⁵⁸, Z⁵, m, q and r may be the same as or different from another combination made therewith. L represents a t-valent linkage group, and has the same meaning as L in formula (XII).

[0156] Further, the formula (XV) is described below. R⁶²represents an aryl group, a heterocyclic group or an aliphatic hydrocarbon group, and has the same meaning as the aryl, heterocyclic or aliphatic hydrocarbon group represented by R¹, R²and R³each in formula (I). R⁶⁴, R⁶⁵and R⁶⁶each represent a hydrogen atom or a substituent group. R⁶⁷represents a substituent group, and q represents an integer of 0 to 4. When q is 2, 3 or 4, the R⁶⁷groups may be the same or different. Z⁶represents atoms forming a 5, 6 or 7-membered ring. R⁶⁴, R⁶⁵, R⁶⁶, R⁶⁷and Z⁶have the same meanings as R⁵⁴, R⁵⁵, R⁵⁶, R⁶⁷and Z⁵, respectively. m represents 0, 1 or 2. p represents 2 or 3. One combination made with R⁶², R⁶⁴, R⁶⁵, R⁶⁶, R⁶⁷, Z⁶, m and q may be the same as or different from another combination made therewith.

[0157] Furthermore, the formula (XVI) is described below. R⁷⁴represents a hydrogen atom or a substituent group. R⁷⁷and R⁷⁸each represent a substituent group. q represents an integer of 0 to 4, and r represents an integer of 0 to 5. When q is 2, 3 or 4, the R⁷⁷groups may be the same or different; while, when r is 2, 3, 4 or 5, the R⁷⁸groups may be the same or different. Z⁷represents atoms forming a 5, 6 or 7-membered ring. R⁷⁴, R⁷⁷, R⁷⁸and Z⁷have the same meanings as R⁵⁴, R⁵⁷, R⁵⁸and Z⁵in formula (XIV), respectively. t represents an integer of at least 2. One combination made with R⁷⁴, R⁷⁵, R⁷⁶, R⁷⁷, R⁷⁸, Z⁷q and r may be the same as or different from another combination made therewith. L represents a t-valent linkage group, and has the same meaning as L in formula (XII).

[0158] In addition, the formula (XVII) is described below. R⁸⁴represents a hydrogen atom or a substituent group. R⁸⁷and R⁸⁸each represent a substituent group. q represents an integer of 0 to 4, and r represents an integer of 0 to 5. When q is 2, 3 or 4, the R⁸⁷groups may be the same or different; while, when r is 2, 3, 4 or 5, the R⁸⁸groups may be the same or different. R⁸⁴, R⁸⁷and R⁸⁸have the same meanings as R⁵⁴, R⁵⁷and R⁵⁸in formula (XIV), respectively. Z⁸represents atoms forming a 5, 6 or 7-membered ring. X⁸represents an oxygen atom, a sulfur atom, N—R^A1or CR^A2R^A3, and R^A1, R^A2and R^A3each represent a hydrogen atom or a substituent group. Z⁸and X⁸have the same meanings as Z^Aand X^Arespectively in formula (A), which constitute the acidic nucleus as one preferred example of Z¹in formula (II). t represents an integer of at least 2. One combination made with R⁸⁴, R⁸⁷, R⁸⁸, Z⁸, X⁸, q and r may be the same as or different from another combination made therewith. L represents a t-valent linkage group, and has the same meaning as L in formula (XII).

[0159] Besides the aforementioned formulae, the formula (XVIII) is described below. R⁹⁴represents a hydrogen atom or a substituent group. R⁹⁷and R⁹⁸each represent a substituent group. q represents an integer of 0 to 4, and r represents an integer of 0 to 5. When q is 2, 3 or 4, the R⁹⁷groups may be the same or different; while, when r is 2, 3, 4 or 5, the R⁹⁸groups may be the same or different. Z⁹represents atoms forming a 5, 6or 7-membered ring. X⁹represents an oxygen atom, a sulfur atom, N—R^A1or CR^A2R^A3, and R^A1, R^A2and R^A3each represent a hydrogen atom or a substituent group. R⁹⁴, R⁹⁷, R⁹⁸, Z⁹and X⁹have the same meanings as R⁸⁴, R⁸⁷, R⁸⁸, Z⁸and X⁸in formula (XVII) respectively. t represents an integer of at least 2. One combination made with R⁹⁴, R⁹⁷, R⁹⁸, Z⁹, X⁹, q and r may be the same as or different from another combination made therewith. L represents a t-valent linkage group, and has the same meaning as L in formula (XII).

[0160] The compounds represented by formula (I) or those represented by any of formulae (III) to (XVIII) may be low molecular weight compounds, or may be high molecular weight compounds having a structure that the compound residue is connected to each constitutional unit of the polymer main chain (the weight average molecular weight of which is preferably from 1,000 to 5,000,000, more preferably from 5,000 to 2,000,000, particularly preferably from 10,000 to 1,000,000) or high molecular weight compounds having a structure that the skeletons represented by formula (I) or those represented by any of formulae (III) to (XVIII) are present in their main chain (the weight average molecular weight of which is preferably from 1,000 to 5,000,000, more preferably from 5,000 to 2,000,000, particularly preferably from 10,000 to 1,000,000). Such high molecular weight compounds may be homopolymers, or copolymers of the aforementioned compounds and other monomers.

[0161] It is preferable that the compounds represented by formula (I), specifically including the compounds represented by formulae (III) to (XVIII), are low molecular weight compounds. Additionally, the formulae (II) to (XVIII) are each expressed in extreme structure for convenience's sake, and so all the compounds illustrated above may be their respective tautomers.

[0162] The desirable combinations of groups constituting a compound represented by formula (I) are described below.

[0163] It is desirable that R¹, R²and R³, which may be the same or different, each be a 6-30C monocyclic or bicyclic aryl group (e.g., phenyl, naphthyl), a 5 or 6-membered aromatic heterocyclic group containing as hetero atom(s) any of nitrogen, oxygen and sulfur atoms or a 1-20C alkyl, alkenyl or alkynyl group, provided that at least two among R¹, R²and R³are each the foregoing aryl or heterocyclic group and at least either of them has amoiety represented by formula (II) as a substituent group. And R¹, R²and R³each may have a substituent group, such as alkyl, alkenyl, aralkyl, aryl, alkoxy, amino, acyl, alkoxycarbonyl, aryloxycarbonyl, carbonylamino, sulfonylamino, sulfamoyl, carbamoyl, hydroxy or heterocyclic group. These groups each may further be substituted. R⁴, R⁵and R⁶in formula (II) are each a hydrogen atom or a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group. It is desirable for Z¹to be a ring derived from an acidic nucleus represented by formula (B), (C), (D), (E), (F) or (G).

[0164] The preferable combinations of groups constituting the compound represented by formula (I) is represented by formula (III). The desirable combinations of groups constituting the compound represented by formula (III) are described below.

[0165] For the compound of formula (III), it is desirable that m is 0, 1 or 2, and R¹and R², which may be the same or different, each be a 6-30C (carbon atoms: 6-30) monocyclic or bicyclic aryl group or a 5 or 6-membered heterocyclic group which contains nitrogen, oxygen or/and sulfur atoms and may have a substituent group, such as alkyl, alkenyl, aralkyl, alkoxy, amino, acyl, alkoxycarbonyl, aryloxycarbonyl, carbonylamino, sulfonylamino, sulfamoyl, carbamoyl, hydroxy or heterocyclic group, R⁷and R⁴each be a hydrogen atom, an alkyl group, an alkoxy group, an alkylthio group, an acyl group, a substituted amino group (the substituent of which is an alkyl, alkenyl, alkynyl, aryl or heterocyclic group), R⁵and R⁶each be a hydrogen atom, an alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group, and Z¹¹be an acidic nucleus derived from a cyclic compound represented by formula (B1), (C1), (D1), (E1), (F1) or (G1).

[0166] The desirable combinations of groups constituting the compound represented by formula (IV) are described below.

[0167] For the compound of formula (IV), it is desirable that m be 0 or 1, R¹and R², which may be the same or different, each be an unsubstituted or substituted phenyl or naphthyl group containing up to 30 carbon atoms or an unsubstituted or substituted 5 or 6-membered aromatic heterocyclic group containing one to two nitrogen atoms or/and one to two sulfur atoms (the substituent of which contains 1 to 20 carbon atoms, such as an alkyl, alkenyl, aralkyl, aryl, alkoxy, amino, acyl, carbonylamino, sulfonylamino or heterocyclic group), R⁷and R⁴each be a hydrogen atom, a 1-20C alkyl group, a 1-20C alkoxy group or a 1-20C substituted amino group (the substituent(s) of which is(are) an alkyl group, an alkenyl group, an alkynyl group, an aryl group or/and a heterocyclic group), R⁵and R⁶each be a hydrogen atom, a 1-20C alkyl group, a 2-20C alkenyl group, a 1-20C acyl group, a 1-20C sulfonyl group, a 2-20C alkoxycarbonyl group, a 1-20C carbonamido group or a cyano group, and Z¹¹be a substituted 1,3-indanedione nucleus, a 2,4,6-triketohexahydropyrimidine nucleus (including a thioketone body), an isooxazolinone nucleus, an oxazolinone nucleus, a furanone nucleus, an oxyindole nucleus, an imidazolidone nucleus, a 1,2,3,6-tetrahydropyridine-2,6-dione nucleus, a benzothiophene-3-one nucleus, an oxobenzothiophene-3-one nucleus, a dioxobenzothiophene-3-one nucleus, a coumaranone nucleus, a 1-indanone nucleus, a 2-thio-2,4-thiazolidinedione nucleus, a 2-thio-2,4-oxazolidinedione nucleus, a 2-thio-2,5-thiazolidinedione nucleus or a 2,4-thiazolidinedione nucleus, especially a substituted 1,3-indanedione nucleus, a 2,4,6-triketohexahydropyrimidine nucleus, a dioxobenzothiophene-3-one nucleus or a 2-thio-2,5-thiazolidinedione nucleus.

[0168] Other desirable combinations of groups constituting a compound represented by formula (I) are those embodied in compounds represented by formulae (XII) and (XIII), respectively.

[0169] The desirable combinations of constituent groups in formula (XII) are described below: The Ar³¹groups, which may be the same or different, each represent a 6-30C monocyclic or bicyclic arylene group (e.g., phenylene or naphthylene) or a divalent 5 or 6-membered aromatic heterocyclic group containing as hetero atom(s) any of nitrogen, oxygen and sulfur atoms. R³²represents a 6-30C monocyclic or bicyclic aryl group (e.g., phenyl, naphthyl), a 5 or 6-membered aromatic heterocyclic group containing as hetero atom(s) any of nitrogen, oxygen and sulfur atoms, or a 1-20C alkyl, alkenyl or alkynyl group. The Ar³¹and R³²groups each may have a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an acyl group or a substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl and heterocyclic groups) R³⁴, R³⁵and R³⁶are each a hydrogen atom or a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group. Z³is any of the rings represented by formulae (B) to (G) respectively. And L is a group comprising one nucleus or at least two linked nuclei (polymerized nuclei), preferably a monomeric to eicosameric group, the nucleus or nuclei of which are selected from the family consisting of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneethynylene, arylenephenylene and triarylamine (the arylene or aryl moiety of which is a group derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole or oxadiazole). Such a nuclei or nuclei may further be combined with an oxygen, nitrogen, sulfur or methylene linkage.

[0170] The desirable combinations in formula (XIII) are described below: The Ar⁴¹groups, which may be the same or different, each represent a 6-30C monocyclic or bicyclic arylene group (e.g., phenylene or naphthylene) or a divalent 5 or 6-membered aromatic heterocyclic group containing as hetero atom(s) any of nitrogen, oxygen and sulfur atoms. R⁴²represents a 6-30C monocyclic or bicyclic aryl group (e.g., phenyl, naphthyl), a 5 or 6-membered aromatic heterocyclic group containing as hetero atom(s) any of nitrogen, oxygen and sulfur atoms, or a 1-20C alkyl, alkenyl or alkynyl group. The Ar⁴¹and R⁴²groups each may have a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an acyl group or a substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl and heterocyclic groups) R⁴⁴, R⁴⁵and R⁴⁶are each a hydrogen atom or a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group. Z⁴is any of the rings derived from the acidic nuclei represented by formulae (B) to (G) respectively.

[0171] The more desirable combinations in formula (XII) are embodied in formula (XIV). The favorable combinations in formula (XIV) are described below: R⁵⁴, R⁵⁵, and R⁵⁶are each a hydrogen atom or a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group. Z⁵is any of the rings represented by formulae (B) to (G) respectively. R⁵⁷and R⁵⁸are each an alkyl group, an alkoxy group, an alkylthio group, an acyl group or a substituted amino group (the substituent of which includes an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group). And L is a group comprising one nucleus or at least two linked nuclei (polymerized nuclei), preferably a monomeric to eicosameric group, the nucleus or nuclei of which are selected from the family consisting of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneethynylene, arylenephenylene and triarylamine (the arylene or aryl moiety of which is a group derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole or oxadiazole). Such a nucleus or nuclei may further be combined with an oxygen, nitrogen, sulfur or methylene linkage.

[0172] The more desirable combinations in formula (XIII) are embodied in formula (XV). The favorable combinations in formula (XV) are described below: R⁶²represents a 6-30C monocyclic or bicyclic aryl group (e.g., phenyl, naphthyl), a 5 or 6-membered aromatic heterocyclic group containing as hetero atom(s) any of nitrogen, oxygen and sulfur atoms, or a 1-20C alkyl, alkenyl or alkynyl group. The R⁶²group may have a substituent group, and such a substituent and R⁶⁷are each an alkyl group, an alkoxy group, an alkylthio group, an acyl group or a substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl and heterocyclic groups) R⁶⁴, R⁶⁵and R⁶⁶are each a hydrogen atom or a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group. And Z⁶is any of the rings represented by formulae (B) to (G) respectively.

[0173] The more desirable combinations in formula (XIV) are embodied in formula (XVI). The favorable combinations in formula (XVI) are described below: R⁷⁴represents a hydrogen atom or a substituent group, such as an alkyl group, an alkoxy group, an alkylthio group, an alkenyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbonamido group or a cyano group. Z⁷represents atoms forming a 5- to 7-membered ring, which may be fused together with another ring. Suitable examples of such rings include rings generally employed as acidic nuclei of merocyanine dyes. R⁷⁷and R⁷⁸are each an alkyl group, an alkoxy group, an alkylthio group, an acyl group or a substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl and heterocyclic groups). And L is a group comprising one nucleus or at least two linked nuclei (polymerized nuclei), preferably a monomeric to eicosameric group, the nucleus or nuclei of which are selected from the family consisting of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneethynylene, arylenephenylene and triarylamine (the arylene or aryl moiety of which is a group derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole or oxadiazole). Such a nucleus or nuclei may further be combined with an oxygen, nitrogen, sulfur or methylene linkage.

[0174] The desirable combinations in formula (XVI) are represented by formula (XVII). Therein, suitable R⁸⁴, R⁸⁷, R⁸⁸and L have the same meanings as R⁷⁴, R⁷⁷, R⁷⁸and L in formula (XVI) respectively, and the acidic nucleus is a ring represented by formula (A) . The more desirable combinations in formula (XVII) are described below: R⁸⁴is a hydrogen atom, a 1-20C alkyl group, a 1-20C alkenyl group, a 1-20C acyl group, a 1-20C sulfonyl group, a 1-20C alkoxycarbonyl group, a 1-20C carbonamido group or a cyano group. R⁸⁷and R⁸⁸are each a 1-20C alkyl group, a 1-20C alkoxy group or a 1-20C substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl and heterocyclic groups). The acidic nucleus is a ring represented by formula (B), (C), (D), (E), (F) or (G), particularly preferably a 1,3-indanedione nucleus, a 2,4,6-triketohexahydropyrimidine nucleus (including its thioketone body), a pyrazolone nucleus, an isooxazolinone nucleus, an oxazolinone nucleus, a furanone nucleus, an oxyindole nucleus, a 1-indanone nucleus, an imidazolidone nucleus, a 1,2,3,6-tetrahydropyridine-2,6-dione nucleus, a benzothiophene-3-one nucleus, an oxobenzothiophene-3-one nucleus, a dioxobenzothiophene-3-one nucleus, a coumaranone nucleus, a 2-thio-2,4-thiazolidinedione nucleus, a 2-thio-2,4-oxazolidinedione nucleus, a 2-thio-2,5-thiazolidinedione nucleus or a 2,4-thiazolidinedione nucleus. And L is a group comprising one nucleus or at least two linked nuclei (polymerized nuclei), preferably a monomeric to eicosameric group, the nucleus or nuclei of which are selected from the family consisting of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneethynylene, arylenephenylene and triarylamine (the arylene or aryl moiety of which is a group derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole or oxadiazole). Such a nucleus or nuclei may further be combined with an oxygen, nitrogen, sulfur or methylene linkage.

[0175] The desirable combinations in formula (XVIII) are described below: R⁹⁴is a hydrogen atom, a 1-20C alkyl group, a 1-20C alkenyl group, a 1-20C acyl group, a 1-20C sulfonyl group, a 1-20C alkoxycarbonyl group, a 1-20C carbonamido group or a cyano group. R⁹⁷and R⁹⁸are each a 1-20C alkyl group, a 1-20C alkoxy group or a 1-20C substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl and heterocyclic groups). The acidic nucleus is a ring represented by formula (B), (C), (D), (E), (F) or (G). And L is a group derived from a monomer to a polymer, preferably a monomer to an eicosamer, of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneethynylene, arylenephenylene or triarylamine (the arylene or aryl moiety of which is a group derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole or oxadiazole). Such a group may further have an oxygen, nitrogen, sulfur or methylene linkage.

[0176] In more desirable combinations, R⁹⁴is a hydrogen atom, a 1-20C alkenyl group, a 1-20C acyl group, a 1-20C sulfonyl group, a 1-20C alkoxycarbonyl group, a 1-20C carbonamido group or a cyano group, while R⁹⁷and R⁹⁸are each a 1-20C alkyl group, a 1-20C alkoxy group or a 1-20C substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl and heterocyclic groups). The acidic nucleus is a 1,3-indanedione nucleus, a 2,4,6-triketohexahydropyrimidine nucleus (including its thioketone body), a pyrazolone nucleus, an isooxazolinone nucleus, an oxazolinone nucleus, a furanone nucleus, an oxyindole nucleus, a 1-indanone nucleus, an imidazolidone nucleus, a 1,2,3,6-tetrahydropyridine-2,6-dione nucleus, a benzothiophene-3-one nucleus, an oxobenzothiophene-3-one nucleus, a dioxobenzothiophene-3-one nucleus, a coumaranone nucleus, a 2-thio-2,4-thiazolidinedione nucleus, a 2-thio-2,4-oxazolidinedione nucleus, a 2-thio-2,5-thiazolidinedione nucleus or a 2,4-thiazolidinedione nucleus. And L is a group comprising one nucleus or at least two linked nuclei (polymerized nuclei), preferably a monomeric to eicosameric group, the nucleus or nuclei of which are selected from the family consisting of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneethynylene, arylenephenylene and triarylamine (the arylene or aryl moiety of which is a group derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole or oxadiazole). Such a nucleus or nuclei may further be combined with an oxygen, nitrogen, sulfur or methylene linkage.

[0177] In particularly desirable combinations, R⁹⁴is a hydrogen atom, a 1-10C alkenyl group, a 1-10C acyl group, a 1-10C sulfonyl group, a 1-10C alkoxycarbonyl group, a 1-10C carbonamido group or a cyano group, while R⁹⁷and R⁹⁸are each a 1-10C alkyl group, a 1-10C alkoxy group or a 1-20C substituted amino group (the substituent of which includes alkyl, alkenyl, alkynyl, aryl, thiophenyl, pyrrolyl, furanyl, selenophenyl, naphthyl, anthrayl, pyridyl, pyridazinyl, pyrimidyl, azulenyl and carbazolyl groups). The acidic nucleus is a 1,3-indanedione nucleus, a 2,4,6-triketohexahydropyrimidine nucleus (including its thioketone body), a pyrazolone nucleus, an isooxazolinone nucleus, an oxazolinone nucleus, a 1-indanone nucleus, a furanone nucleus, an oxyindole nucleus, an imidazolidone nucleus, a 1,2,3,6-tetrahydropyridine-2,6-dione nucleus, a benzothiophene-3-one nucleus, an oxobenzothiophene-3-one nucleus, a dioxobenzothiophene-3-one nucleus, a coumaranone nucleus, a 2-thio-2,4-thiazolidinedione nucleus, a 2-thio-2,4-oxazolidinedione nucleus, a 2-thio-2,5-thiazolidinedione nucleus or a 2,4-thiazolidinedione nucleus. And L is a group derived from one nucleus or two to six linked nuclei, the nucleus or nuclei of which are selected from the family consisting of aniline, benzene, thiophene, pyrrole, furan, selenophene, naphthalene, anthracene, pyridine, pyridazine, pyrimidine, azulene, carbazole, arylenevinylene, aryleneethynylene, arylenephenylene and triarylamine (the arylene or aryl moiety of which is a group derived from benzene, thiophene, pyrrole, furan, selenophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole or oxadiazole). Such a nucleus or nuclei may further be combined with an oxygen, nitrogen, sulfur or methylene linkage.

[0178] Examples of a compound represented by formula (I) are illustrated below, but it should be understood that these examples are not to be construed as limiting the scope of the invention in any way.

[0179] Syntheses of some of the present compounds represented by formula (I) are illustrated below.

[0180] Although various methods can be employed for synthesizing compounds represented by formula (I), the case of the method in which one aryl group of an arylamine compound is formylated and then made to react with an active methylene compound in the presence of a base is taken for illustration.

[0181] Synthesis of Compound (D-1) exemplified hereinbefore:

[0182] In 50 ml of ethanol, 2.7 g of 4-(N,N-diphenylamino)-benzaldehyde and 2.2 g of 5-phenylindane-1,3-dione were dissolved. Thereto, 1.0 g of piperidine was added, and heated under reflux for 3 hours. The resulting reaction solution was allowed to stand at room temperature, and crystals separated out during the standing. The crude crystals obtained was purified by column chromatography on silica gel, and then recrystallized from an ethanol-chloroform mixture to yield the desired product Compound (D-1). The product showed the absorption maximum λmax at 493 nm (ClCH₂CH₂Cl) and the melting point at 178-181° C.

[0183] The desired Compound (D-2) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 512 nm and the melting point at 254-255° C.

[0184] The desired Compound (D-5) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 468 nm.

[0185] The desired Compound (D-17) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 484 nm.

[0186] The desired Compound (D-22) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 469 nm.

[0187] The desired Compound (D-23) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 471 nm.

[0188] The desired Compound (D-51) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 492 nm.

[0189] The desired Compound (D-52) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 495 nm.

[0190] The desired Compound (D-53) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 507 nm.

[0191] The desired Compound (D-56) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 426 nm.

[0192] The desired Compound (D-57) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 527 nm.

[0193] The desired Compound (D-58) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 432 nm.

[0194] The desired Compound (D-59) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 451 nm.

[0195] The desired Compound (D-60) was synthesized using the same method as in Synthesis Example 1. The synthesis product showed the absorption maximum λmax at 428 nm.

[0196] Then, the electroluminescent (EL) device comprising an arylamine compound according to the invention (hereinafter referred to as the present compound) is illustrated below.

[0197] The desired Compound (E-2) was synthesized in accordance with the following reaction scheme:

[0198] In 50 ml of ethanol, 2.3 g of Intermediate A and 0.8 g of Intermediate B were dissolved, and heated under reflux for 6 hours. The reaction solution was allowed to stand at room temperature, and thereby crystals were precipitated therefrom. These crude crystals were filtered off, and purified by chromatography on silica gel. Further, they were recrystallized from an ethanol-chloroform mixture to yield the desired product, or Compound (E-2).

[0199] Then, the electroluminescent (EL) device comprising an amine compound according to the invention (which is also referred to as the present compound) is illustrated below.

[0200] The organic layers of an EL device comprising the present compound have no particular restrictions as to the formation method. Various methods, such as a resistance heating-utilized vapor deposition method, an electron-beam heating method, a sputtering method, a molecular lamination method, a coating method and an ink jet method can be adopted. In particular, the resistance heating-utilized vapor deposition method and the coating method are favorable methods from the viewpoints of the characteristics imparted to the device and the efficiency in producing the device.

[0201] The present luminescent device is a device having a luminescent layer or two or more thin layers of organic compounds, including a luminescent layer, between a pair of electrodes, an anode and a cathode. The thin layers the device may have in addition to the luminescent layer are, e.g., a hole injection layer, a hole transfer layer, an electron injection layer, an electron transfer layer and a protective layer. The aforementioned layers each may have another function also. For forming each layer, various materials can be employed.

[0202] The anode supplies holes to a hole injection layer, a hole transfer layer and a luminescent layer. As a material for the anode, metals, alloys, metal oxides, electrically conductive materials and mixtures thereof, preferably materials having a work function of at least 4 eV, can be used. Examples of such materials include conductive metal oxides, such as tin oxide, zinc oxide, indium oxide and indium tin oxide (ITO), metals such as gold, silver, chromium and nickel, mixtures or laminates of those metals and conductive metal oxides, inorganic conductive materials such as copper iodide and copper sulfide, organic conductive materials such as polyaniline, polylthiophene and polypyrrole, and laminates of those materials and ITO. Of the materials recited above, the conductive metal oxides are favored over the others. In particular, ITO is used to advantage from the viewpoint of productivity, conductivity and transparency. The suitable thickness of the anode, though can be selected depending on the anode material, is generally from 10 nm to 5 μm, preferably 50 nm to 1 μm, particularly preferably 100 nm to 500 nm.

[0203] The anode has on a soda lime glass, alkali-free glass or transparent resin substrate an anode material formed into a layer. In a case of using a glass substrate, alkali-free glass is preferred from the viewpoint of reduction in ions eluted from the glass. When soda glass is used as the substrate, it is desirable that the barrier coat, such as silica, be provided on the glass. The thickness of the substrate has no particular limitation as long as the substrate can ensure mechanical strength for the anode. For instance, the suitable thickness of a glass substrate is generally at least 0.2 mm, preferably at least 0.7 mm. The methods suitable for making the anode vary with the material used. In the case of ITO, for example, the film formation can be carried out using an electron-beam heating method, a sputtering method, a resistance heating-utilized vapor deposition method, a chemical reaction method (e.g., sol-gel method) or the method of coating a dispersion of indium tin oxide. Washing and other treatments for the anode enable the device to get a reduction in operating potential and improve in light-emitting efficiency. In the case of an anode using ITO, it is effective for the anode to receive UV-ozone treatment or plasma treatment.

[0204] The cathode supplies electrons to an electron injection layer, an electron transfer layer and a luminescent layer. In selecting the cathode, the adhesiveness to the electron injection, electron transfer or luminescent layer adjacent to the cathode, ionization potential and the stability are taken into consideration. As a material for the cathode, metals, alloys, metal halides, metal oxides, electrically conductive materials and mixtures thereof can be employed. Examples of such materials include alkali metals (e.g., Li, Na, K) and the fluorides thereof, alkaline earth metals (e.g., Mg, Ca) and the fluorides thereof, gold, silver, lead, aluminum, Na—K alloy or the mixture thereof, Li—Al alloy or mixture, Mg—Ag alloy or mixture, and rare earth metals (e.g., In, Yb). Of these materials, the materials having a work function of at most 4 eV are favored over the others. In particular, aluminum, Li—Al alloy or mixture, and Mg—Ag alloy or mixture are used to advantage. The cathode structure may be a single-layer of the compound or mixture as recited above or a laminate of the compounds and/or mixtures as recited above. The suitable thickness of the cathode, though can be selected depending on the cathode material, is generally from 10 nm to 5 μm, preferably 50 nm to 1 μm, particularly preferably 100 nm to 1 μm. Informing the cathode, various known methods, such as an electron-beam heating method, a sputtering method, a resistance heating-utilized vapor deposition method and a coating method, can be adopted. The metals as recited above may be evaporated independently, or two or more thereof may be evaporated simultaneously. Further, it is possible to evaporate a plurality of metals at the same time to form an alloy electrode, or to evaporate the previously prepared alloy. It is advantageous to the luminescent device that both anode and cathode have low sheet resistance, specifically several hundreds Ω/□ at the highest.

[0205] The material usable for a luminescent layer is a material capable of forming a layer which can function so as to receive both hole injection from the anode, the hole injection layer or the hole transfer layer and electron injection from the cathode, the electron injection layer or the electron transfer layer when the electric field is applied thereto, permit the charges injected therein to move and enable the emission of light by providing a place for recombining the holes and the electrons. As the material as defined above, the present amine compounds can be contained in the luminescent layer. In addition, other materials hitherto known to be luminescent, such as benzoxazole derivatives, benzimidazole derivatives, benzothiazole derivatives, styrylbenzene derivatives, polyphenyl derivatives, diphenylbutadiene derivatives, tetraphenylbutadiene derivatives, naphthalimide derivatives, coumarin derivatives, perylene derivatives, perinone derivatives, oxadiazole derivatives, aldazine derivatives, pyraridine derivatives, cyclopentadiene derivatives, bisstyrylanthracene derivatives, quinacridone derivatives, pyrrolopyridinederivatives, thiadiazolopyridinederivatives, styrylamine derivatives, aromatic dimethylidyne derivatives, various metal complexes represented by metal or rare earth complexes of 8-quinolinol derivatives, and polymeric compounds such as polythiophene, polyphenylene and polyphenylene-vinylene, may also be used in the luminescent layer. Although the luminescent layer has no particular restrictions as to the thickness, the suitable thickness thereof is generally from 1 nm to 5 μm, preferably 5 nm to 1 μm, particularly preferably 10 nm to 500 nm.

[0206] As to the method of forming the luminescent layer, there is no particular restrictions, but various methods including a resistance heating-utilized vapor deposition method, an electron-beam heating method, a sputtering method, a molecular lamination method, a coating method (e.g., a spin coating, cast coating or dip coating method), an ink jet method and an LB method can be adopted. Of these methods, resistance heating-utilized vapor deposition and coating methods are favored over the others.

[0207] The materials for the hole injection layer and the hole transfer layer may be any materials so long as they have any one of the functions as an injector of the holes from the anode, a transfer or of holes and a barrier against electrons injected from the cathode. Examples of materials hitherto known to have one of such functions include carbazole derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aromatic tertiary amine compounds, styrylamine compounds, aromatic dimethylidyne compounds, porphyrin compounds, polysilane compounds, and conductive polymers or oligomers, such as poly(N-vinylcarbazole) derivatives, aniline copolymers and thiophene oligomers or polythiophene. The thickness of the hole injection layer and the hole transfer layer each, though it has no particular limitation, is generally from 1 nm to 5 μm, preferably 5 nm to 1 μm, particularly preferably 10 nm to 500 nm. Each of the hole injection layer and the hole transfer layer may have a single-layer structure constituted of one or more of the materials recited above or a multiple-layer structure made up of at least two layers having the same composition or different compositions.

[0208] As a method of forming a hole injection layer and a hole transfer layer, a vacuum evaporation method, an LB method, an ink jet method and a method of coating a compound capable of injecting or transferring holes in the form of a solution or dispersion in an appropriate solvent (using, e.g., a spin coating, cast coating or dip coating method) can be adopted. In the case of a coating method, the compound can be dissolved or dispersed in the presence of a resin component (binder polymer). Examples of such a resin component include polyvinyl chloride, polycarbonate, polystyrene, polymethyl methacrylate, polybutyl methacrylate, polyester, polysulfone, polyphenylene oxide, polybutadiene, poly(N-vinylcarbazole), hydrocarbon resin, ketone resin, phenoxy resin, polyamide, ethyl cellulose, polyvinyl acetate, ABS resin, polyurethane, melamine resin, unsaturated polyester resin, alkyd resin, epoxy resin and silicone resin.

[0209] The materials for the electron injection layer and the electron transfer layer may be any materials so long as they have any one of the functions as an injector of the electrons from the cathode, a transfer or of electrons and a barrier against holes injected from the anode. Examples of compounds known to have such a function include triazole derivatives, oxazole derivatives, oxadiazole derivatives, fluorenone derivatives, anthraquinodimethane derivatives, anthrone derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodimide derivatives, fluorenylidenemethane derivatives, distyrylpyrazine derivatives, heterocyclic tetracarboxylic acid anhydrides such as naphthaleneperylene, phthalocyanine derivatives, and various metal complexes represented by metal complexes of 8-quinolinol derivatives, metallophthalocyanine and metal complexes containing benzoxazole or benzothiazole ligands. The thickness of the electron injection layer and the electron transfer layer each, though it has no particular limitation, is generally from 1 nm to 5 μm, preferably 5 nm to 1 μm, particularly preferably 10 nm to 500 nm. Each of the electron injection layer and the electron transfer layer may have a single-layer structure constituted of one or more the compounds as recited above, or a multiple-layer structure made up of at least two layers having the same composition or different compositions.

[0210] As a method of forming the electron injection layer and the electron transfer layer, a vacuum evaporation method, an LB method, an ink jet method and a method of coating the compound(s) capable of injecting or transferring electrons in the form of a solution or dispersion in an appropriate solvent (using, e.g., a spin coating, cast coating or dip coating method) can be adopted. In a case of adopting the coating method, the electron-injecting or transferring compounds can be dissolved or dispersed in the presence of a resin component. Examples of a resin component usable therein include the same resins as employed for the hole injection and transfer layers.

[0211] The materials for a protective layer may be any substances so long as they have a function capable of inhibiting the invasion of a device deterioration promoter, such as moisture or oxygen, into the device. Examples of such a substance include metals, such as In, Sn, Pb, Au, Cu, Ag, Al, Ti and Ni; metal oxides, such as MgO, SiO, SiO₂, Al₂O₃, GeO, NiO, CaO, BaO, Fe₂O₃, Y₂O₃and TiO₂; metal fluorides, such as MgF₂, LiF, AlF₃and CaF₂; polyethylene, polypropylene, polymethyl methacrylate, polyimide, polyurea, polytetrafluoroethylene, polychlorotrifluoroethylene, polydichlorodifluoroethylene, copolymer of chlorotrifluoroethylene and dichlorodifluoroethylene, copolymers prepared by polymerizing a mixture of tetrafluoroethylene and at least one comonomer, and fluorine-containing copolymers having cyclic structures on the main chain; a water-absorbing substance having a water absorption rate of at least 1%; and a moistureproof substance having a water absorptivity of at most 0.1%.

[0212] The protective layer also has no particular restriction as to the formation method, but any of a vacuum evaporation method, a sputtering method, a reactive sputtering method, a molecular beam epitaxy (MBE) method, a cluster ion beam method, an ion plating method, a plasma polymerization method (high frequency excitation ion plating method), a plasma chemical vapor deposition (CVD) method, a laser CVD method, a heat CVD method, a gas source CVD method, a coating method and an ink jet method can be adopted for the formation thereof.

[0213] The present invention will now be illustrated in more detail by reference to the following examples. However, the invention should not be construed as being limited to these examples.

[0214] A transparent substrate having indium tin oxide (ITO) formed into a 150 nm-thick layer on a glass substrate measuring 25 mm×25 mm×0.7 mm in size (produced by Tokyo Sanyo Shinku K.K.) was etched and cleaned. Onto this substrate kept at room temperature, an about 40 nm-thick N,N′-bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD) film, an about 40 nm-thick film of a compound selected from the compounds set forth in Table 1 and an about 20 nm-thick tris(8-hydroxyquinolinato)aluminum (Alq) film were evaporated in that order under a vacuum of 10⁻³to 10⁻⁴Pa. On the organic thin film lamination thus formed, a patterned mask (for adjusting each emission area to 5 mm×5 mm) was set and further, inside the vacuum. evaporator, Mg and Ag were deposited simultaneously in a Mg/Ag ratio of 10/1 to form a metallic film having a thickness of 250 nm, followed by deposition of a 300 nm-thick Ag film.

[0215] The thus produced organic luminescent device was made to luminesce by applying thereto a DC constant voltage by means of a source measure unit, Model 2400, made by Toyo Technica Co., Ltd. The luminance and wavelength of the luminescence obtained were measured with a luminometer BM-8 made by Topcon Co. and a spectrum analyzer PMA-11 made by Hamamatsu Photonics Co. respectively. The measurement results are shown in Table 1.

[0216] The symbols in Table 1 signify the following:

[0217] ⊚: No dark spots can be confirmed by visual observation.

[0218] ◯: There are few dark spots.

[0219] Δ: There are many dark spots.

[0220] X : There are a great many dark spots.

[0221] The structural formulae of Comparative Compounds used are as follows:

[0222] (The compound described in J. Appl. Phys., (1998), 83, (8), 4403)

[0223] (The compound disclosed in JP-A-8-97465)

[0224] As can be seen from the results set forth in Table 1, the luminescent devices having luminescent layers made up of the present compounds alone gave off luminescence of high luminance at various wavelengths. This indicates that the present compounds are useful as a luminescent material enabling the planar luminescence of even quality. Moreover, the present compounds were found to ensure excellent durability. In particular, when the luminescent layer was formed using the present compound corresponding to the compound having a substituent group or a condensed ring on the 1,3-indandione nucleus of Comparative Compound D, which is described as an electron transferring material in JP-A-8-97465, the present compounds of such structures sharpened the tone and shifted the luminescence wavelength to the longer side to ensure high color purity in the luminescence, and further showed excellent durability. In addition, it was demonstrated that the present compounds having 3-phenyl-1-indanone as their respective acidic nuclei enabled the luminescence of particularly high luminance in the orange to yellow region.

[0225] After etching and cleaning an ITO substrate in the same manner as in Example 1, a TPD film having a thickness of about 40 nm was evaporated onto the ITO substrate, and further thereon to a compound selected from the compounds set forth in Table 2 and Alq (tris(8-hydroxyquinolinato)aluminum) were evaporated simultaneously at evaporation speeds of 0.04 Å/sec and 4 Å/sec respectively to form a film of about 60 nm. And then, a cathode was deposited in the same manner as in Example 1. The thus made luminescent devices were evaluated by the same method as in Example 1. The evaluation results obtained are shown in Table 2.

[0226] As can be seen from the results shown in Table 2, the use of the present compounds as doping dyes enabled the luminescence of high luminance and the production of planar luminescent materials of even quality. Further, it was found that the luminescent materials utilizing the present compounds as doping dyes had excellent durability.

[0227] On the ITO substrate etched and cleaned in the same manner as in Example 1, a solution containing 40 mg of poly(N-vinylcarbazole), 12 mg of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and 0.5 mg of a compound selected from the compounds set forth in Table 3 in 3 ml of 1,2-dichloroethane was spin-coated. The thickness of the organic thin film thus formed was about 120 nm. On the organic thin film, a cathode was formed in the same manner as in Example 1. The thus made luminescent devices were evaluated by the same method as in Example 1. The results obtained are shown in Table 3.

[0228] As can be seen from the results shown in Table 3, the devices using the present compounds enabled the luminescence of high luminance under low driving voltage though they were made by the coating method generally providing low luminance to luminescent devices, compared with those using the comparative compounds.

[0229] Onto the ITO substrate etched and cleaned in the same manner as in Example 1, a TPD film having a thickness of about 40 nm was evaporated and then a film of the present Compound D-2 was evaporated in a thickness of about 80 nm, followed by vacuum deposition of the same cathode as in Example 1.

[0230] As to the result of examinations made in the same way as in Example 1, the thus made device showed the luminance of 50 cd/m²under the driving voltage of 15 V, and the red luminescence having high color purity of (0.65, 0.34), expressed in the CIE chromaticity coordinates (x, y), and its λmax at 631 nm was observed. Thus, the present compound has proved to be useful as an electron injecting and transfer agent besides acting as a luminescent substance.

[0231] On the ITO substrate etched and cleaned in the same manner as in Example 1, a solution containing 40 mg of poly(N-vinylcarbazole), 12 mg of 2,5-BIS(1-naphthyl)-1,3,4-oxadiazole, 10 mg of 1,1,4,4-tetraphenylbutadiene, 0.5 mg of DCM and 0.1 mg of the present Compound D-1 in 3 ml of 1,2-dichloroethane was spin-coated. Thereon, a cathode was vacuum-deposited in the same manner as in Example 1.

[0232] The thus made device was examined for luminescent characteristics by applying DC voltage between the ITO electrode as anode and the Mg:Ag electrode as cathode. At the driving voltage of 15 V, the device gave off the white luminescence (luminance: 1300 cd/m²) of (x, y)=(0.35, 0.36) on the CIE chromaticity coordinates. Thus, the present compound has proved to be effective for white luminescence.

[0233] A transparent substrate having a 150 nm-thick ITO layer on a glass base measuring 25 mm×25 mm×0.7 mm in size (produced by Tokyo Sanyo Shinku K.K.) was etched and cleaned. Onto this substrate kept at room temperature, an about 40 nm-thick N,N′-bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD) film, an about 40 nm-thick film of a compound selected from the compounds set forth in Table 4 and an about 20 nm-thick tris (8-hydroxyquinolinato) aluminum (Alq) film were evaporated in that order under a vacuum of 10⁻³to 10⁻⁴Pa. On the organic thin film lamination thus formed, a patterned mask (for adjusting each emission area to 5 mm×5 mm) was set and further, inside the vacuum evaporator, Mg and Ag were deposited simultaneously in a Mg/Ag ratio of 10/1 to form a metallic film having a thickness of 250 nm, followed by deposition of a 300 nm-thick Ag film.

[0234] The thus prepared organic luminescent device was made to produce luminescence by applying thereto a DC constant voltage by means of a source measure unit, Model 2400, made by Toyo Technica Co., Ltd. The luminance and the wavelength of luminescence thus generated were measured with a luminometer BM-8 made by Topcon Co. and a spectrum analyzer PMA-11 made by Hamamatsu Photonics Co. respectively, thereby evaluating characteristics in the early stages. Further, the state of planar luminescence was observed after each device was made to produce luminescence for 100 hours by the operation at a constant current of 5 mA in an atmosphere of nitrogen. Furthermore, the thermal storage stability was evaluated by storing each device for 24 hours at 80° C. in an atmosphere of nitrogen, causing the device to produce luminescence and then observing the state of its luminous surface. The measurement results are shown in Table 4.

[0235] The results shown in Table 4 indicate that the use of the present compounds each as the only constituent of a luminescent layer enabled the resultant luminescent device to acquire satisfactory color purity (expressed in CIE chromaticity) and produce luminescence of high luminance. Further, few black spots were observed in the luminescent devices using the present compounds even after the devices continued to luminesce for many hours. This observation result proves that the present compounds ensured excellent durability for the luminescent devices. In addition, the luminescent devices prepared using the present compounds exhibited excellent planar luminescence and thermal storage stability.

[0236] Onto the ITO substrate etched and cleaned in the same manner as in Example 6 was evaporated a TPD film having a thickness of about 40 nm. Further thereon to, a compound selected from the compounds set forth in Table 5 and tris(8-hydroxyquinolinato)aluminum (Alq) were evaporated simultaneously at evaporation speeds of 0.04 Å/sec and 4 Å/sec respectively to form a film of about 40 nm. Furthermore thereon to was evaporated an Alq film having a thickness of about 20 nm, followed by evaporation of the same cathode as in Example 6. The thus prepared EL devices were evaluated by the same method as in Example 6. The evaluation results obtained are shown in Table 5.

[0237] As can be seen from the results shown in Table 5, the use of the present compounds as dopants enabled the luminescence of high luminance and the production of planar luminescent materials of even quality. Further, it has proved that the luminescent materials containing the present compounds as dopants had excellent durability.

[0238] On the ITO substrate etched and cleaned in the same manner as in Example 6 was spin-coated a solution containing 40 mg of poly(N-vinylcarbazole), 12 mg of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and 0.5 mg of a compound selected from the compounds set forth in Table 6 in 3 ml of 1,2-dichloroethane. The thickness of the organic thin film thus formed was about 120 nm. Onto the organic thin film, a cathode was evaporated in the same manner as in Example 6. The thus prepared EL devices were evaluated by the same method as in Example 6. The results obtained are shown in Table 6.

[0239] As can be seen from the results shown in Table 6, the devices using the present compounds enabled the luminescence of high luminance under low operating voltage though they were made by the coating method generally providing low luminance to luminescent devices, compared with those using the comparative compounds.

[0240] Onto the ITO substrate etched and cleaned in the same manner as in Example 6, a film of the present Compound E-2 having a thickness of about 60 nm was evaporated. Then, a Alq film having a thickness of about 40 nm was evaporated thereon to. Further thereon, the same cathode as in Example 6 was formed by vacuum deposition.

[0241] The evaluation results of the thus made device are as follows: The luminance under the operating voltage of 15 V was 550 cd/m², and the red luminescence having high color purity of (0.63, 0.35), expressed in the CIE chromaticity coordinates (x, y), and its λmax at 640 nm was observed. Thus, the present compound has proved to be useful as an electron injection and transfer agent besides acting as a luminescent substance.

[0242] Onto the ITO glass substrate etched and cleaned in the same manner as in Example 6, a N,N′-bis(1-naphthyl)-N,N′-diphenylbenzidine (NPD) film having a thickness of about 40 nm, a Compound D-2 film having a thickness of about 20 nm, a Bathocuproine film having a thickness of about 10 nm and an Alq film having a thickness of about 30 nm were evaporated in that order. Further thereon, the same cathode as in Example 6 was formed by vacuum deposition.

[0243] The evaluation results of the thus made device are as follows: The luminance under the operating voltage of 14 V was 1520 cd/m², and the red luminescence having high color purity of (0.63, 0.35), expressed in the CIE chromaticity coordinates (x, y), and its λmax at 643 nm was observed.

[0244] On the ITO glass substrate etched and cleaned in the same manner as in Example 6, a solution containing 40 mg of poly(N-vinylcarbazole), 12 mg of 2,5-bis(1-naphthyl)-1,3,4-oxadiazole, 10 mg of 1,1,4,4-tetraphenylbutadiene and 0.1 mg of the present Compound D-2 in 3 ml of 1,2-dichloroethane was spin-coated. Thereon, a cathode was vacuum-deposited in the same manner as in Example 1.

[0245] The thus made device was examined for luminescent characteristics by applying thereto a DC voltage while using the ITO electrode as anode and the Mg:Ag electrode as cathode. At the operating voltage of 15 V, the device gave off the white luminescence (luminance: 1200 cd/m²) of (x, y)=(0.36, 0.35) on the CIE chromaticity coordinates. Thus, the present compound has proved to be effective for white luminescence.

[0246] When each of the particular amine compounds represented by formula (I) according to the present invention forms one constituent film of an EL device by themselves, the constituent film enables the EL device to exhibit luminescence of high luminance, especially red electroluminescence of high luminance and high color purity, compared with the films of conventional luminescent dyes, and can ensure excellent quality and high durability for planar luminescent devices. Further, the use of the present amine compound in an EL device of non-dope type enables the production of devices of almost even quality to carry an advantage of reducing the production cost. Moreover, even when the present organic EL devices are made by a coating method known to generally provide devices of low luminance, they can have excellent luminescent characteristics.