WO2004050794A1 - Orgnaic light emitting materials and organic electroluminescence devices using the same - Google Patents

Orgnaic light emitting materials and organic electroluminescence devices using the same Download PDF

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WO2004050794A1
WO2004050794A1 PCT/KR2003/002605 KR0302605W WO2004050794A1 WO 2004050794 A1 WO2004050794 A1 WO 2004050794A1 KR 0302605 W KR0302605 W KR 0302605W WO 2004050794 A1 WO2004050794 A1 WO 2004050794A1
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formula
group
integer
light
organic
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Dong-Myung Shin
Gwon-Young Ryu
Sung-Taek Lim
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Dong-Myung Shin
Gwon-Young Ryu
Sung-Taek Lim
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Priority to AU2003284783A priority Critical patent/AU2003284783A1/en
Publication of WO2004050794A1 publication Critical patent/WO2004050794A1/en

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/12Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/655Aromatic compounds comprising a hetero atom comprising only sulfur as heteroatom
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10Non-macromolecular compounds
    • C09K2211/1003Carbocyclic compounds
    • C09K2211/1007Non-condensed systems
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10Non-macromolecular compounds
    • C09K2211/1003Carbocyclic compounds
    • C09K2211/1014Carbocyclic compounds bridged by heteroatoms, e.g. N, P, Si or B
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10Non-macromolecular compounds
    • C09K2211/1018Heterocyclic compounds
    • C09K2211/1025Heterocyclic compounds characterised by ligands
    • C09K2211/1074Heterocyclic compounds characterised by ligands containing more than three nitrogen atoms as heteroatoms
    • C09K2211/1081Heterocyclic compounds characterised by ligands containing more than three nitrogen atoms as heteroatoms with sulfur
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00Constructional details relating to the organic devices covered by this subclass
    • H10K2102/10Transparent electrodes, e.g. using graphene
    • H10K2102/101Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
    • H10K2102/103Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising indium oxides, e.g. ITO
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers

Definitions

  • the present invention relates to red light-emitting materials for organic electroluminescent devices and to organic electroluminescent devices using the same. More particularly, it relates to low-molecular red light-emitting materials, to be applicable for a luminescent layer, a hole-injecting and -transporting layer and an electron-injecting and -transporting layer of an organic electroluminescent device, and to organic electroluminescent devices with high efficiency using the same.
  • An organic EL device is a self-luminescent flat panel display and is characterized by high brightness, low-voltage operation, good portability and high impact resistance resulting from being a complete solid device.
  • An organic EL device has advantages that the manufacturing process thereof is simpler than those of a liquid crystal display, a plasma display device or the like, and therefore has high productivity, and multicolored electroluminescence can be realized.
  • Light-emitting materials for organic EL devices can be classified as polymer type compounds and low-molecular type compounds.
  • polymer type compounds an organic EL device should be produced by a wet process, which has relatively more factors to increase the defects of a device, such as pin-holes.
  • an organic EL device manufactured using low-molecular compounds can minimize the above defects.
  • the present invention provides light-emitting compounds to be applicable for a hole- injecting and -transporting layer, an electron-injecting and -transporting layer and a luminescent layer of an organic electroluminescent device, which is represented by the following formula 1.
  • the present invention in consideration of the problems of the above methods, provides an organic electroluminescent device comprising a luminescent layer without mixing of materials.
  • Light-emitting compounds according to the present invention may be represented by the following formula 1 : [Formula 1] wherein Dj and D 2 each independently represent an aromatic amine group, carbazole group or carbazole derivatives which is able to donate electrons by resonance; and Ai and A 2 each includes a double bond capable of conjugation with the central benzene ring, a cyano group capable of conjugation with the central benzene ring and the double bond, and a heteroaromatic or aromatic group capable of conjugation with the central benzene ring and the double bond without conjugation with the cyano group.
  • Light-emitting compounds represented by the above formula 1 have a symmetrical structure in which aromatic amine groups, carbazole groups or carbazole derivatives, which is able to donate electrons by resonance, are symmetrically arranged; and for control of the light-emitting region, groups including both a cyano group bonded to a double bond capable of conjugation with the central benzene ring and a heteroaromatic or aromatic group capable of conjugation with the central benzene ring and the double bond, without conjugation with the cyano group, are symmetrically arranged and conjugate with D] and D 2 via the central benzene ring.
  • the aromatic amine groups, carbazole groups and carbazole derivatives induce an electron-donating ability in the molecule of the light-emitting compound, and the cyano group and the heteroaromatic or aromatic group accept electron to control the luminescent region.
  • the electroluminesence characteristic of the light-emitting compound and the electric property of an electric device containing the light-emitting compound can be controlled by modifying or changing the electron-donating group and the position of the cyano group and heteroaromatic or aromatic group.
  • D] and D 2 may be the same or different from each other and represented by the following formulae 2 or 3: wherein Ri and R 2 may be the same or different from each other and selected from the group consisting of hydrogen atom, aliphatic alkyl group having from 1 to 20 carbon atoms, branched alkyl group, cyclic alkyl group having from 5 to 24 carbon atoms and aromatic group having from 4 to 30 carbon atoms; aromatic group of the formula has at least one substituent selected from the group consisting of halogen atom comprising F, CI, Br and I, alkoxy group having from 1 to 12 carbon atoms, aliphatic amine and aromatic amine; and n is an integer from 0 to 3; [Formula 3]
  • R 3 and R 4 may be the same or different from each other, each having at least one substituent selected from the group consisting of aliphatic alkyl group having from 1 to 20 carbon atoms and groups represented by the following formulae 4 to 6; and n is an integer from 1 to 5:
  • n is an integer from 0 to 10;
  • n is an integer from 0 to 10;
  • R 5 and R 6 each independently represents hydrogen atom or alkyl group having from 1 to 6 carbon atoms; and n is an integer from 0 to 10.
  • a ! and A 2 each includes a double bond capable of conjugation with the central benzene ring, a cyano group capable of conjugation with the central benzene ring and the double bond, and a heteroaromatic or aromatic group capable of conjugation with the central benzene ring and the double bond, without conjugation with the cyano group, and particularly may be represented by the following formulae 7 or 8:
  • R 9 is selected from the group consisting of alkyl group having from 1 to 5 carbon atoms, cyclic compound having from 5 to 20 carbon atoms and halogen atom comprising F, CI, Br and I;
  • R u is selected from groups represented by the following formulae 12 to 20;
  • n is an integer from 2 to 8.
  • At least one hydrogen atom of the aryl group, aromatic group and heteroaromatic group may be substituted by a halogen atom selected from F, CI, Br and I, preferably F, CF 3 or CN.
  • the present invention provides an organic EL device comprising at least one layer containing the light-emitting compound represented by the above formula 1 , inserted between anode and cathode.
  • the present invention provides an organic EL device having high luminous efficiency, which comprises a pure organic layer without mixing of other organic compounds as a luminescent layer.
  • Light-emitting compounds for electric devices are used for forming a luminescent layer (104, 204), as shown in Figs. 1 or 2.
  • a luminescent layer can be composed of pure or doped organic compounds.
  • this layer was composed of light-emitting compound capable of functioning as an electron-transporting layer.
  • the present invention suggests organic EL devices using the light-emitting compound as a hole-injecting and -transporting layer (103 of Fig. 1 or 203 of Fig. 2), without separate hole-injecting and transporting layer.
  • the light-emitting compound of the present invention can be applied to a luminescent layer, electron-transporting layer and electron-injecting layer of organic an EL device.
  • organic EL devices using the present light-emitting compound as an electron-injecting and -transporting and luminescent layer (104, 204) of Figs. 1 or 2, light emission in the visible region was observed.
  • the present invention provides light-emitting compounds satisfying the general structure of the above formula 1 which can maximize luminous efficiency in the pure form of the luminescent layer without mixing of other kinds of light-emitting compounds or sensitizer.
  • an organic EL device may be manufactured by using a known hole-injecting and -transporting layer, as shown in Fig. 1.
  • -injecting and -transporting layer may be composed of 4,4
  • NPD 4,4
  • an organic EL device may be manufactured by using a known electron-injecting and -transporting layer as shown in Fig. 2.
  • the electron-injecting and -transporting layer may be composed of 8 -hydroxyquinoline aluminum salt (hereinafter may be abbreviated to "Alq”), l,l,4,4-tetraphenyl-l,3-butaniene (hereinafter may be abbreviated to "TPB”), oxadiazole derivatives, etc.
  • an organic EL device may be manufactured by using a known electron-injecting and -transporting layer and hole-injecting and -transporting layer, as shown in Fig. 3.
  • the electron-injecting and -transporting layer may be composed of Alq, TPB, or oxadiazole derivatives, etc.
  • the hole-injecting and -transporting layer may be composed of NPD, polycarbazole, or polycyclic aromatic compounds, etc.
  • the cathode electrodes shown in Figs 1 to 3 may be formed from materials capable of easily injecting electrons into an electron-injecting and -transporting layer. Specific examples thereof include lithium-aluminum alloys; magnesium-silver alloys; magnesium; calcium; or multi-layer structures such as lithium fluoride(LiF)/aluminum, lithium oxide(Li 2 0)/aluminum, etc.
  • the compounds represented by the following formulae 21a, 21b, 21c and 2 Id may typically exemplify the compounds of the above formula 1.
  • Fig. 1 is a schematic cross-sectional view of an organic EL device manufactured by using the light-emitting compound of the present invention as an electron- injecting and -transporting and luminescent layer.
  • Fig. 2 is a schematic cross-sectional view of an organic EL device manufactured by using the light-emitting compound of the present invention as a hole-injecting and -transporting and luminescent layer.
  • Fig. 3 is a schematic cross-sectional view of an organic EL device manufactured by using the light-emitting compound of the present invention as a luminescent layer.
  • Fig. 4 is a schematic cross-sectional view of an organic EL device comprising a single layer of the light-emitting compound of the present invention.
  • Fig. 5 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 21a satisfying the chemical structure of the formula 1 , in the example 1.
  • Fig. 6 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 21b satisfying the chemical structure of the formula 1, in the example 2.
  • Fig. 7 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 21c satisfying the chemical structure of the formula 1, in the example 3.
  • Fig. 8 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 2 Id satisfying the chemical structure of the formula 1, in the example 4.
  • Fig. 9 is an electroluminescence spectrum of the organic EL device shown in Fig. 1, manufactured by using the light- emitting compound of the formula 21c satisfying the chemical structure of the formula 1, in the example 5.
  • Fig. 10 is an electroluminescence spectrum of the organic EL device shown in Fig. 2, manufactured by using the light-emitting compound of the formula 21a satisfying the chemical structure of the formula 1, in the example 6.
  • Fig. 11 is an electroluminescence spectrum of the organic EL device shown in Fig. 3, manufactured by using the light-emitting compound of the formula 21b satisfying the chemical structure of the formula 1, in the example 7.
  • Anode electrode 403 Organic light-emitting layer
  • Electron-injecting and -transporting layer Electron-injecting and -transporting layer, or Electron-injecting and -transporting and luminescent layer
  • Electron-injecting and -transporting layer Electron-injecting and -transporting layer, or Electron-injecting and -transporting and luminescent layer
  • a method for synthesizing light-emitting compounds of the present invention may be schematized by the following reaction schemes la and lb.
  • the red solid was filtrated then washed successively with distilled water, ethanol, n-hexane and a sufficient quantity of ethylacetate. Subsequently, it was recrystallized from methylene chloride/hexane and sublimated under 10-6 mmHg, to give 0.35g (45.5% of yield) of the title compound as red solid.
  • the red solid was filtrated then washed successively with distilled water, ethanol, n-hexane and a sufficient quantity of ethylacetate. Subsequently, it was recrystallized from methylene chloride/hexane and sublimated under 10-6 mmHg, to give 0.1 lg (55.6% of yield) of the title compound as red solid.
  • the red solid was filtrated and then washed successively with distilled water, ethanol, n-hexane and a sufficient quantity of ethylacetate. Subsequently, it was recrystallized from methylene chloride/hexane, to give 0.57g (57.8% of yield) of the title compound as red solid.
  • red solid was filtrated, and washed successively with distilled water, ethanol and n-hexane, then dissolved in ethylacetate. Subsequently, the obtained red solution was distillated under reduced pressure to remove solvent, to give red solid, which was recrystallized from methylene chloride/hexane, to give 0.41g of red solid. It was then sublimated under 10-6 mmHg, to give 0.35g (24.3%) of yield) of the title compound.
  • the following organic EL devices were manufactured by using the compounds of the formulae 21a to 2 Id satisfying the chemical structure of the formula 1 as hole-injecting material.
  • An organic single layer was formed by thermal evaporation of the compound of the formula 21a satisfying the chemical structure of the above formula 1 at a thickness of lOOnm on an ITO transparent electrode as shown in Fig. 4.
  • An aluminum electrode was formed thereon at a thickness of 200nm.
  • deposition rates of the compound and of aluminum were O.lnm/sec and lnm/sec respectively.
  • An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 5.
  • An organic EL device having the same structure as that in example 1 was manufactured by using the compound of the formula 21b.
  • An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 6.
  • An organic EL device having the same structure as that in example 1 was manufactured by using the compound of the formula 21c.
  • An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 7.
  • An organic EL device having the same structure as that in example 1 was manufactured by using the compound of the formula 2 Id.
  • An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 8.
  • an organic EL device having the structure shown in Fig. 1 was manufactured and electroluminescence characteristic thereof was measured. After thermal evaporation of NPD at a thickness of 50nm on an ITO transparent electrode as a hole-injecting and -transporting layer, an electron-injecting and transporting and luminescent layer was formed thereon by thermal evaporation of the compound of the formula 21c satisfying the chemical structure of the above formula 1 at a thickness of 50nm. Thereafter, the same procedure as that in example 1 was followed to form an aluminum electrode. A schematic cross-sectional view of the obtained organic EL device is shown in Fig. 1, and an electroluminescence spectrum of the obtained organic EL device in Fig. 9.
  • Light-emitting compounds of the present invention have a symmetric structure of amine derivatives donating electrons and cyano group withdrawing electron. Therefore, they can be applied as hole-transporting layer, an electron-transporting layer and a luminescent layer, and all for them.
  • the light-emitting compounds of the present invention may be used for organic EL devices, they can perform all the functions of a hole-transporting layer and an electron-transporting layer, as well as that of a luminescent layer. Multicolored electroluminescence can be realized by mixing other kinds of light-emitting compounds.
  • Light-emitting compounds of the present invention can be applied as a hole-transporting layer, an electron-transporting layer and a luminescent layer and thereby realize multicolored electroluminescence. Therefore, the present compounds can be applied to organic EL devices such as flat panel displays.

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Abstract

The present invention provides light-emitting compounds represented by the following formula 1 and organic electroluminescent devices comprising the light-emitting compounds, which can exhibit red light emission and high luminous efficiency.

Description

ORGANIC LIGHT EMITTING MATERIALS AND ORGANIC ELECTROLUMINESCENCE DEVICES USING THE SAME
FIELD OF THE INVENTION
The present invention relates to red light-emitting materials for organic electroluminescent devices and to organic electroluminescent devices using the same. More particularly, it relates to low-molecular red light-emitting materials, to be applicable for a luminescent layer, a hole-injecting and -transporting layer and an electron-injecting and -transporting layer of an organic electroluminescent device, and to organic electroluminescent devices with high efficiency using the same.
BACKGROUND OF THE INVENTION
In recent years, organic electroluminescent (EL) devices have attracted attentions to their possibility for flat panel displays, and have been rapidly developed. An organic EL device is a self-luminescent flat panel display and is characterized by high brightness, low-voltage operation, good portability and high impact resistance resulting from being a complete solid device. An organic EL device has advantages that the manufacturing process thereof is simpler than those of a liquid crystal display, a plasma display device or the like, and therefore has high productivity, and multicolored electroluminescence can be realized.
Light-emitting materials for organic EL devices can be classified as polymer type compounds and low-molecular type compounds. Using polymer type compounds, an organic EL device should be produced by a wet process, which has relatively more factors to increase the defects of a device, such as pin-holes. On the other hand, an organic EL device manufactured using low-molecular compounds can minimize the above defects.
In a development of organic EL devices using low-molecular compounds, it is very important to realize multicolored electroluminescence, a merit thereof. For multicolored electroluminescence, a lamination method has been studied to form a luminescent layer of an organic EL device by mixing two or more compounds. This method has been applied especially to red organic EL devices. Recently, this method has used a triplet state of organic compounds. Red organic EL devices using the triplet state exhibit improved luminous efficiency. This method requires a process for forming a thin film by uniformly mixing two or more compounds. However, the method of using a triplet state has difficulty in obtaining a uniformly mixed state of compounds in the process of forming the thin film. In addition, it has a problem that it is very sensitive to oxygen in the air.
Further, for multicolored electroluminescence, a novel method of laminating light-emitting materials on both sides of the interface between two organic compounds was developed. This method makes use of the characteristic that exciton due to a recombination of a hole and an electron can be formed on both sides of the interface between two organic compounds. However, this method has difficulty in obtaining a uniformly mixed state of compounds in the process of forming a thin film. In addition, it is also difficult to develop materials having both hole-injecting and -transporting abilities together with satisfactory electroluminescence characteristics.
SUMMARY OF THE INVENTION
Therefore, the present invention provides light-emitting compounds to be applicable for a hole- injecting and -transporting layer, an electron-injecting and -transporting layer and a luminescent layer of an organic electroluminescent device, which is represented by the following formula 1.
Further, the present invention, in consideration of the problems of the above methods, provides an organic electroluminescent device comprising a luminescent layer without mixing of materials.
Light-emitting compounds according to the present invention may be represented by the following formula 1 : [Formula 1]
Figure imgf000004_0001
wherein Dj and D2 each independently represent an aromatic amine group, carbazole group or carbazole derivatives which is able to donate electrons by resonance; and Ai and A2 each includes a double bond capable of conjugation with the central benzene ring, a cyano group capable of conjugation with the central benzene ring and the double bond, and a heteroaromatic or aromatic group capable of conjugation with the central benzene ring and the double bond without conjugation with the cyano group.
DETAILED DESCRIPTION OF THE INVENTION
Light-emitting compounds represented by the above formula 1 have a symmetrical structure in which aromatic amine groups, carbazole groups or carbazole derivatives, which is able to donate electrons by resonance, are symmetrically arranged; and for control of the light-emitting region, groups including both a cyano group bonded to a double bond capable of conjugation with the central benzene ring and a heteroaromatic or aromatic group capable of conjugation with the central benzene ring and the double bond, without conjugation with the cyano group, are symmetrically arranged and conjugate with D] and D2 via the central benzene ring.
The aromatic amine groups, carbazole groups and carbazole derivatives induce an electron-donating ability in the molecule of the light-emitting compound, and the cyano group and the heteroaromatic or aromatic group accept electron to control the luminescent region. In addition, the electroluminesence characteristic of the light-emitting compound and the electric property of an electric device containing the light-emitting compound can be controlled by modifying or changing the electron-donating group and the position of the cyano group and heteroaromatic or aromatic group.
In the above formula 1, D] and D2 may be the same or different from each other and represented by the following formulae 2 or 3:
Figure imgf000005_0001
wherein Ri and R2 may be the same or different from each other and selected from the group consisting of hydrogen atom, aliphatic alkyl group having from 1 to 20 carbon atoms, branched alkyl group, cyclic alkyl group having from 5 to 24 carbon atoms and aromatic group having from 4 to 30 carbon atoms; aromatic group of the formula has at least one substituent selected from the group consisting of halogen atom comprising F, CI, Br and I, alkoxy group having from 1 to 12 carbon atoms, aliphatic amine and aromatic amine; and n is an integer from 0 to 3; [Formula 3]
w Xherein R3 and R4 may be the same or different from each other, each having at least one substituent selected from the group consisting of aliphatic alkyl group having from 1 to 20 carbon atoms and groups represented by the following formulae 4 to 6; and n is an integer from 1 to 5:
[Formula 4] — (CH2)n-^~^>
wherein n is an integer from 0 to 10;
[Formula 5]
Figure imgf000006_0001
wherein n is an integer from 0 to 10;
[Formula 6]
Figure imgf000006_0002
wherein R5 and R6 each independently represents hydrogen atom or alkyl group having from 1 to 6 carbon atoms; and n is an integer from 0 to 10.
Meanwhile, in the above formula 1, A! and A2 each includes a double bond capable of conjugation with the central benzene ring, a cyano group capable of conjugation with the central benzene ring and the double bond, and a heteroaromatic or aromatic group capable of conjugation with the central benzene ring and the double bond, without conjugation with the cyano group, and particularly may be represented by the following formulae 7 or 8:
[Formula 7]
Figure imgf000007_0001
wherein Y is hydrogen atom or cyano group; n is an integer from 1 to 6; and R is selected from groups represented by the above formulae 2 and 3 and the following formulae 9 to 19;
[Formula 8]
Figure imgf000007_0002
wherein Y is hydrogen atom or cyano group; n is an integer from 1 to 6; and R8 is selected from groups represented by the above formulae 2 and 3 and the following formulae 9 to 20:
[Formula 9]
Figure imgf000007_0003
wherein R9 is selected from the group consisting of alkyl group having from 1 to 5 carbon atoms, cyclic compound having from 5 to 20 carbon atoms and halogen atom comprising F, CI, Br and I;
[Formula 10]
Figure imgf000008_0001
wherein Rι0 is selected from groups represented by the following formulae 12 to 20;
[Formula 11]
Figure imgf000008_0002
wherein Ru is selected from groups represented by the following formulae 12 to 20;
[Formula 12]
Figure imgf000008_0003
wherein n is an integer from 2 to 8;
[Formula 13]
Figure imgf000008_0004
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 8;
[Formula 14]
Figure imgf000009_0001
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7;
Figure imgf000009_0002
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7;
[Formula 16]
Figure imgf000009_0003
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7;
[Formula 17]
Figure imgf000009_0004
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7; [Formula 18]
Figure imgf000010_0001
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 4;
[Formula 19]
Figure imgf000010_0002
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 4;
[Formula 20]
-CN
Meanwhile, in each functional group of the formulae, at least one hydrogen atom of the aryl group, aromatic group and heteroaromatic group may be substituted by a halogen atom selected from F, CI, Br and I, preferably F, CF3 or CN.
The present invention provides an organic EL device comprising at least one layer containing the light-emitting compound represented by the above formula 1 , inserted between anode and cathode.
Further, the present invention provides an organic EL device having high luminous efficiency, which comprises a pure organic layer without mixing of other organic compounds as a luminescent layer. Light-emitting compounds for electric devices, particularly organic EL devices, are used for forming a luminescent layer (104, 204), as shown in Figs. 1 or 2. Such a luminescent layer can be composed of pure or doped organic compounds. In the prior art, this layer was composed of light-emitting compound capable of functioning as an electron-transporting layer.
Departing from known light-emitting compounds used in the prior art, the present invention suggests organic EL devices using the light-emitting compound as a hole-injecting and -transporting layer (103 of Fig. 1 or 203 of Fig. 2), without separate hole-injecting and transporting layer. In addition, the light-emitting compound of the present invention can be applied to a luminescent layer, electron-transporting layer and electron-injecting layer of organic an EL device. In all cases of organic EL devices using the present light-emitting compound as an electron-injecting and -transporting and luminescent layer (104, 204) of Figs. 1 or 2, light emission in the visible region was observed.
In prior organic EL devices, particularly red organic EL devices, it was known how to form a luminescent layer by mixing other kinds of light-emitting compounds or sensitizer, in order to maximize luminous efficiency.
However, the present invention provides light-emitting compounds satisfying the general structure of the above formula 1 which can maximize luminous efficiency in the pure form of the luminescent layer without mixing of other kinds of light-emitting compounds or sensitizer.
In the case that the light-emitting compound satisfying the general structure of the above formula 1 is used as an electron-injecting and -transporting and luminescent layer, an organic EL device may be manufactured by using a known hole-injecting and -transporting layer, as shown in Fig. 1. The hole
-injecting and -transporting layer may be composed of 4,4|-bis[N-(l-naphthyl)- N-phenylamino]biphenyl (hereinafter may be abbreviated to "NPD"), aryl amines, polycarbazole, polycyclic aromatic compounds, etc.
In the case that the light-emitting compound satisfying the general structure of the above formula 1 is used as a hole- injecting and -transporting and luminescent layer, an organic EL device may be manufactured by using a known electron-injecting and -transporting layer as shown in Fig. 2. The electron-injecting and -transporting layer may be composed of 8 -hydroxyquinoline aluminum salt (hereinafter may be abbreviated to "Alq"), l,l,4,4-tetraphenyl-l,3-butaniene (hereinafter may be abbreviated to "TPB"), oxadiazole derivatives, etc. In the case that the light-emitting compound satisfying the general structure of the above formula 1 is used only as a luminescent layer, an organic EL device may be manufactured by using a known electron-injecting and -transporting layer and hole-injecting and -transporting layer, as shown in Fig. 3. The electron-injecting and -transporting layer may be composed of Alq, TPB, or oxadiazole derivatives, etc., and the hole-injecting and -transporting layer may be composed of NPD, polycarbazole, or polycyclic aromatic compounds, etc.
The cathode electrodes shown in Figs 1 to 3 may be formed from materials capable of easily injecting electrons into an electron-injecting and -transporting layer. Specific examples thereof include lithium-aluminum alloys; magnesium-silver alloys; magnesium; calcium; or multi-layer structures such as lithium fluoride(LiF)/aluminum, lithium oxide(Li20)/aluminum, etc.
According to the present invention, the compounds represented by the following formulae 21a, 21b, 21c and 2 Id may typically exemplify the compounds of the above formula 1. [Formula 21a]
Figure imgf000013_0001
[Formula 21b]
Figure imgf000013_0002
[Formula 21c]
Figure imgf000013_0003
[Formula 2 Id]
Figure imgf000014_0001
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic cross-sectional view of an organic EL device manufactured by using the light-emitting compound of the present invention as an electron- injecting and -transporting and luminescent layer.
Fig. 2 is a schematic cross-sectional view of an organic EL device manufactured by using the light-emitting compound of the present invention as a hole-injecting and -transporting and luminescent layer.
Fig. 3 is a schematic cross-sectional view of an organic EL device manufactured by using the light-emitting compound of the present invention as a luminescent layer. Fig. 4 is a schematic cross-sectional view of an organic EL device comprising a single layer of the light-emitting compound of the present invention.
Fig. 5 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 21a satisfying the chemical structure of the formula 1 , in the example 1. Fig. 6 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 21b satisfying the chemical structure of the formula 1, in the example 2.
Fig. 7 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 21c satisfying the chemical structure of the formula 1, in the example 3.
Fig. 8 is an electroluminescence spectrum of the organic EL device shown in Fig. 4, manufactured by using the light-emitting compound of the formula 2 Id satisfying the chemical structure of the formula 1, in the example 4. Fig. 9 is an electroluminescence spectrum of the organic EL device shown in Fig. 1, manufactured by using the light- emitting compound of the formula 21c satisfying the chemical structure of the formula 1, in the example 5.
Fig. 10 is an electroluminescence spectrum of the organic EL device shown in Fig. 2, manufactured by using the light-emitting compound of the formula 21a satisfying the chemical structure of the formula 1, in the example 6.
Fig. 11 is an electroluminescence spectrum of the organic EL device shown in Fig. 3, manufactured by using the light-emitting compound of the formula 21b satisfying the chemical structure of the formula 1, in the example 7.
<Description of reference numbers in the drawings>
101, 201, 301, 401 : Glass substrate
102, 202, 302, 402 : Anode electrode 403 : Organic light-emitting layer
103 : Hole-injecting and -transporting layer 104 : Electron-injecting and -transporting and luminescent layer
203 : Hole-injecting and -transporting and luminescent layer
204 : Electron-injecting and -transporting layer, or Electron-injecting and -transporting and luminescent layer
303 : Hole-injecting and -transporting layer
304 : Luminescent layer
305 : Electron-injecting and -transporting layer, or Electron-injecting and -transporting and luminescent layer
105, 205, 306, 404 : Cathode electrode
PREFERRED EMBODIMENT OF THE INVENTION
The present invention will be described in more detail by way of the following synthesis examples and examples, which should not be considered to limit the scope of the present invention.
[Synthesis Examples] A method for synthesizing light-emitting compounds of the present invention may be schematized by the following reaction schemes la and lb.
[Reaction Scheme la]
Figure imgf000017_0001
(1)
Figure imgf000017_0002
(IV)
[Reaction Scheme lb]
Figure imgf000017_0003
(π) + (HI) ABCV-n
(II) + (IV) ABCV-IH
Figure imgf000017_0004
<Synthesis Example 1> Preparation of ( II );
4,4"-bis(di-methylamino - 1 , l':4'.1 "-terphenyl-2'.5'-dicarbaldehvde
0.5g of 2,5-dibromo-l,4-dicarbaldehyde, 0.69g of 4-(dimethylamino) phenylboronic acid and O. lg of tetrakis(triphenylphosphine) palladium(O) were added to a mixture of 20rn-6 of toluene, lOmϋ. of tetrahydrofiiran and 1.5m# of
1M Na2CO3 degassed by nitrogen gas. The obtained mixture was reacted for 24 hours while refluxing and stirring under a nitrogen atmosphere, at a temperature of 86°C .
After reaction, the mixture was poured into water, extracted with methylene chloride, and dried over magnesium sulfate anhydride, then distillated under reduced pressure to remove solvent, to give light-brown solid. It was then subjected to chromatography using ethylacetate and n-hexane as eluant, to give
0.48g (75.2% of yield) of the title compound as light- yellow solid.
NMR analysis : Varian Unity INOVA 500 Η-NMR( δ , CDC13) : 10.10(2H, s), 8.06(2H, s, aromatic), 7.31(4H, d, aromatic),
6.82(4H, d, aromatic), 3.04(12H, s)
13C-NMR( δ , CDC13) : 192.85, 192.80, 150.45, 143.64, 136.36, 131.07, 129.88,
123.00, 112.15, 40.33
<Svnthesis Example 2> Preparation of (HI); l, -biphenyl-4-ylacetonitrile
2.00g of 4-bromophenylacetonitrile, 1.57g of phenylboronic acid and
0.59g of tetrakis(triphenylphosphine) palladium(O) were added to a mixture of
240m£ of toluene and 10ml of 1M Na2C03 degassed by nitrogen gas. The obtained mixture was reacted for 24 hours while refluxing and stirring under a nitrogen atmosphere, at a temperature of 86 °C .
After reaction, the mixture was poured into water, extracted with methylene chloride, dried over magnesium sulfate anhydride, and distillated under reduced pressure to remove solvent, then subjected to chromatography using ethylacetate and n-hexane as eluant, to give 1.42g (72.0% of yield) of the title compound as white solid, mp °C (DSC): 97.3 °C NMR analysis : Varian Unity INOVA 500
Η-NMR( δ , CDC13) : 7.61~7.34(9H, aromatic), 3.79(2H, s)
13C-NMR( δ , CDCI3) : 141.09, 140.17, 128.85, 128.33, 127.80, 127.61, 127.04,
23.28
<Synthesis Example 3> Preparation of (IV); (4-thien-2-yrphenyl) acetonitrile)
3.00g of 4-bromophenylacetonitrile, 2.35g of 2-thiopheneboronic acid and 0.88g of tetrakis(triphenylphosphine) palladium(O) were added to a mixture of 200ro£ of toluene, 40m£ of tetrahydrofiiran and 15m£ of 1M Na2C03 degassed by nitrogen gas. The obtained mixture was reacted for 24 hours while refluxing and Stirling under a nitrogen atmosphere, at a temperature of 86 °C .
After reaction, the mixture was poured into water, extracted with methylene chloride, dried over magnesium sulfate anhydride, and distillated under reduced pressure to remove solvent, and then subjected to chromatography using methylene chloride and n-hexane as eluant, to give 0.89g (29.2% of yield) of the title compound as white solid. mp°C (DSC): 106°C
NMR analysis : Varian Unity INOVA 500
Η-NMR( δ , CDCI3) : 7.61(2H, d, aromatic), 7.33~7.29(4H, aromatic) 7.08(1H, s, aromatic), 3.75(2H, s) 13C-NMR( δ , CDCI3) : 143.26, 134.28, 128.84, 128.43, 128.10, 126.49, 125.23, 123.49, 117.65, 23.28 <Synthesis Example 4> Preparation of ABCV- I ;
((2Z)-3-4,4"-bis(dimethylamino -5'-[(£r)-2-cvano-2-phenylvinyl1- 1.1 ':4M"-terphenyl -2'-yl-2-phenylacrylonitrile
0.50g of 4,4"-bis(dimethylamino)-l,l':4',l,,-te henyl-2,,5,-dicarbaldehyde and 0.40g of benzyl cyanide were added to \40mi of ethanol and thereto was added a solution of 0.15g of sodium in 10m# of absolute ethanol, under stirring. The mixture was then reacted for 40 hours at room temperature, to give red solid.
The red solid was filtrated then washed successively with distilled water, ethanol, n-hexane and a sufficient quantity of ethylacetate. Subsequently, it was recrystallized from methylene chloride/hexane and sublimated under 10-6 mmHg, to give 0.35g (45.5% of yield) of the title compound as red solid.
<Synthesis Example 5> Preparation of ABCV- II ; (2Z)-2-(l.l,-biphenyl-4-yl)-3-r5'-r(E)-2-cvano-2-(l,l,-biphenyl-4-vnvinvn-4,4"-bis (dimethylamino - 1 , l':4', 1 "-terphenyl-2'-yl] acryl onitrile
0.1 Og of 4,4"-bis(dimethylamino)- 1 , 1 ':4 1 "-teφhenyl-2',5,-dicarbaldehyde and 0.12g of l,r-biphenyl-4-ylacetonitrile were added to 130m-£ of ethanol and thereto was added a solution of 0.15g of sodium in lOmt of absolute ethanol, under stirring. The mixture was then reacted for 40 hours at room temperature, to give red solid.
The red solid was filtrated then washed successively with distilled water, ethanol, n-hexane and a sufficient quantity of ethylacetate. Subsequently, it was recrystallized from methylene chloride/hexane and sublimated under 10-6 mmHg, to give 0.1 lg (55.6% of yield) of the title compound as red solid.
<Synthesis Example 6> Preparation of ABCV- HI; ((2Z)-3-4,4"-bis(dimethylamino)-5'-r(jg -2-cvano-2-(4-thien-2-vIphenyl vinyl]-l . :4'.l"-terphenyl-2'-yl-2-('4-thien-2-ylρhenyl acrylonitrile
0.50g of 4,4"-bis(dimethylamino)- 1 , 1 ':4', 1 "-teφhenyl-2',5'-dicarbaldehyde and 0.59g of (4-thien-2-ylphenyl)acetonitrile were added to \30ml of ethanol and lOm-β of tetrahydrofiiran, and thereto was added a solution of 0.1 g of sodium in 5ml of absolute ethanol, under stirring. The mixture was then reacted for 40 hours at room temperature, to give red solid.
The red solid was filtrated and then washed successively with distilled water, ethanol, n-hexane and a sufficient quantity of ethylacetate. Subsequently, it was recrystallized from methylene chloride/hexane, to give 0.57g (57.8% of yield) of the title compound as red solid.
<Synthesis Example 7> Preparation of ABCV- IV;
('2E)-3-4,4"-bis(dimethylamino)-5'-r(E)-2-cvano-2-thien-2-ylvinyll- 1.1 ':4'.1 "-teφhenyl -2'-yl-2-thien-2-ylacrylonitrile 0.50g of 4,4"-bis(dimethylamino)-l,l,:4,,l"-teφhenyl-2',5'-dicarbaldehyde and 0.40g of 2-thiopheneacetonitrile were added to \50ml of ethanol and thereto was added a solution of 0.15g of sodium in 5ml of absolute ethanol, under stirring. The mixture was then reacted for 40 hours at room temperature, to give red solid. The red solid was filtrated and then washed successively with distilled water, ethanol, n-hexane and a sufficient quantity of ethylacetate. Subsequently, it was recrystallized from methylene chloride/hexane and sublimated under 10-6 mmHg, to give 0.49g (62.6% of yield) of the title compound as red solid.
<Synthesis Example 8> Preparation of ABCV- V ; (2Z)-3-4,4"-bis(dimethylamino -5l-[(E -2-cvano-2-(pentafluorophenyl vinyl]-l ,r :4M "-teφhenyl-2'-yl-2-ψentafluorophenyl acrylonitrile
0.50g of 4,4"-bis(dimethylamino)-l ,l':4',l"-teφhenyl-2,,5,-dicarbaldehyde and 0.70g of pentafluoroacetonitrile were added to 150m£ of ethanol and thereto was added a solution of 0.15g of sodium in 5ml of absolute ethanol, under stirring. The mixture was then reacted for 40 hours at room temperature, to give red solid.
The red solid was filtrated, and washed successively with distilled water, ethanol and n-hexane, then dissolved in ethylacetate. Subsequently, the obtained red solution was distillated under reduced pressure to remove solvent, to give red solid, which was recrystallized from methylene chloride/hexane, to give 0.41g of red solid. It was then sublimated under 10-6 mmHg, to give 0.35g (24.3%) of yield) of the title compound.
In order to confirm that the light-emitting compounds satisfying the chemical structure of the formula 1 may function as a hole-injecting and hole-transporting layer in an organic EL device, the following organic EL devices were manufactured by using the compounds of the formulae 21a to 2 Id satisfying the chemical structure of the formula 1 as hole-injecting material.
<Examρle 1>
An organic single layer was formed by thermal evaporation of the compound of the formula 21a satisfying the chemical structure of the above formula 1 at a thickness of lOOnm on an ITO transparent electrode as shown in Fig. 4. An aluminum electrode was formed thereon at a thickness of 200nm. In this process, deposition rates of the compound and of aluminum were O.lnm/sec and lnm/sec respectively. An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 5. <Example 2>
An organic EL device having the same structure as that in example 1 was manufactured by using the compound of the formula 21b. An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 6.
<Example 3>
An organic EL device having the same structure as that in example 1 was manufactured by using the compound of the formula 21c. An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 7.
<Example 4>
An organic EL device having the same structure as that in example 1 was manufactured by using the compound of the formula 2 Id. An electroluminescence spectrum of the obtained organic EL device is shown in Fig. 8.
<Example 5>
In order to demonstrate if electroluminescence may be observed in the case that the light-emitting compound of the formula 21c satisfying the chemical structure of the above formula 1 is used for an electron-injecting and -transporting and luminescent layer, an organic EL device having the structure shown in Fig. 1 was manufactured and electroluminescence characteristic thereof was measured. After thermal evaporation of NPD at a thickness of 50nm on an ITO transparent electrode as a hole-injecting and -transporting layer, an electron-injecting and transporting and luminescent layer was formed thereon by thermal evaporation of the compound of the formula 21c satisfying the chemical structure of the above formula 1 at a thickness of 50nm. Thereafter, the same procedure as that in example 1 was followed to form an aluminum electrode. A schematic cross-sectional view of the obtained organic EL device is shown in Fig. 1, and an electroluminescence spectrum of the obtained organic EL device in Fig. 9.
<Example 6>
In order to demonstrate if electroluminescence may be observed in the case that the light-emitting compound of the formula 21a satisfying the chemical structure of the above formula 1 is used for a hole-injecting and -transporting and luminescent layer, an organic EL device having the structure shown in Fig. 2 was manufactured and the electroluminescence characteristic thereof was measured.
After thermal evaporation of the compound of the formula 21a satisfying the chemical structure of the above formula 1 at a thickness of 50nm on an ITO transparent electrode as a hole-injecting and -transporting and luminescent layer, an electron-injecting and transporting layer was formed thereon by thermal evaporation of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-l,3,4-oxadiazole (hereinafter may be abbreviated to "PBD" ) at a thickness of 50nm. Thereafter, the same procedure as that in example 1 was followed to form an aluminum electrode. A schematic cross-sectional view of the obtained organic EL device is shown in Fig. 2, and an electroluminescence spectrum of the obtained organic EL device in Fig. 10.
<Example 7>
In order to demonstrate if electroluminescence may be observed in the case that the light-emitting compound of the formula 21b satisfying the chemical structure of the above formula 1 is used for a luminescent layer, an organic EL device having the structure shown in Fig. 3 was manufactured and the electroluminescence characteristic thereof was measured.
After thermal evaporation of NPD at a thickness of 50nm on an ITO transparent electrode as a hole-injecting and -transporting layer, a luminescent layer was formed thereon by thermal evaporation of the compound of the formula 21b satisfying the chemical structure of the above formula 1 at a thickness of 20mn. An electron-injecting and -transporting layer was then formed by thermal evaporation of PBD at a thickness of 30nm. Thereafter, the same procedure as that in example 1 was followed to form an aluminum electrode. A schematic cross-sectional view of the obtained organic EL device is shown in Fig. 3, and an electroluminescence spectrum of the obtained organic EL device in Fig. 11.
Light-emitting compounds of the present invention have a symmetric structure of amine derivatives donating electrons and cyano group withdrawing electron. Therefore, they can be applied as hole-transporting layer, an electron-transporting layer and a luminescent layer, and all for them. In the case that the light-emitting compounds of the present invention may be used for organic EL devices, they can perform all the functions of a hole-transporting layer and an electron-transporting layer, as well as that of a luminescent layer. Multicolored electroluminescence can be realized by mixing other kinds of light-emitting compounds.
While the present invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various modifications and variations can be made therein and without departing from the spirit and scope thereof. Thus, it is intended that the present invention cover the modifications and variations thereof provided they come within the scope of the appended claims and their equivalents. INDUSTRIAL APPLICATION OF THE INVENTION
Light-emitting compounds of the present invention can be applied as a hole-transporting layer, an electron-transporting layer and a luminescent layer and thereby realize multicolored electroluminescence. Therefore, the present compounds can be applied to organic EL devices such as flat panel displays.

Claims

1. A light-emitting compound represented by the following formula 1 : [Formula 1]
Figure imgf000027_0001
wherein Dj and D2 each independently represent an aromatic amine group, carbazole group or carbazole derivatives, able to donate electrons by resonance; and A) and A2 each includes a double bond capable of conjugation with the central benzene ring, a cyano group capable of conjugation with the central benzene ring and the double bond, and a heteroaromatic or aromatic group capable of conjugation with the central benzene ring and the double bond, without conjugation with the cyano group.
2. The light-emitting compound according to Claim 1, wherein Dj and D2 in the formula 1, are the same or different from each other and represented by the following formulae 2 or 3: [Formula 2] wherein \ and R2 are the same or different from each other and selected from the group consisting of hydrogen atom, aliphatic alkyl group having from 1 to 20 carbon atoms, branched alkyl group, cyclic alkyl group having from 5 to 24 carbon atoms, and aromatic group of the formula having from 4 to 30 carbon atoms; the aromatic group has at least one substituent selected from the group consisting of halogen atom including one or more of F, CI, Br and I, alkoxy group having from 1 to 12 carbon atoms, aliphatic amine and aromatic amine; and n is an integer from 0 to 3; [Formula 3]
Figure imgf000028_0001
wherein R3 and R may be the same or different from each other each having at least one substituent selected from the group consisting of aliphatic alkyl group having from 1 to 20 carbon atoms and groups represented by the following formulae 4 to 6; and n is an integer from 1 to 5: [Formula 4]
-(CH2)n- W / wherein n is an integer from 0 to 10; [Formula 5]
Figure imgf000028_0002
wherein n is an integer from 0 to 10; [Formula 6]
Figure imgf000028_0003
wherein R5 and R6 each independently represents hydrogen atom or alkyl group having from 1 to 6 carbon atoms; and n is an integer of from 0 to 10.
3. The light-emitting compound according to Claim 1, wherein A] and A2 in the formula 1 are represented by the following formulae 7 or 8: [Formula 7]
Figure imgf000029_0001
wherein Y is hydrogen atom or cyano group; n is an integer from 1 to 6; and R7 is selected from groups represented by the above formulae 2 and 3 and the following formulae 9 to 19;
[Formula 8]
Figure imgf000029_0002
wherein Y is hydrogen atom or cyano group; n is an integer from 1 to 6; and Rg is selected from groups represented by the above formulae 2 and 3 and the following formulae 9 to 20: [Formula 9]
Figure imgf000029_0003
wherein R9 is selected from the group consisting of alkyl group having from 1 to 5 carbon atoms, cyclic compound having from 5 to 20 carbon atoms, and halogen atom comprising F, CI, Br and I; [Formula 10]
10
Figure imgf000029_0004
wherein R10 is selected from groups represented by the following formulae 12 to
20;
[Formula 11]
Figure imgf000030_0001
wherein Rn is selected from groups represented by the following formulae 12 to
20;
[Formula 12]
Figure imgf000030_0002
wherein n is an integer from 2 to 8; [Formula 13]
Figure imgf000030_0003
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 8; [Formula 14]
Figure imgf000030_0004
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7; [Formula 15]
Figure imgf000030_0005
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7; [Formula 16]
Figure imgf000031_0001
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7; [Formula 17]
Figure imgf000031_0002
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 7; [Formula 18]
Figure imgf000031_0003
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 4;
[Formula 19]
Figure imgf000031_0004
wherein X is selected from the group consisting of oxygen, nitrogen and sulfur; and n is an integer from 2 to 4;
[Formula 20]
-CN
4. The light-emitting compound according to any one of Claims 1 to 3, wherein in each functional group of the formulae 2 to 19, at least one hydrogen atom of the aryl group, aromatic group and heteroaromatic group is substituted by halogen atom selected from F, CI, Br and I, CF3, or CN.
5. The light-emitting compound according to Claim 1, which is selected from the compounds represented by the following formulae 21a to 2 Id: [Formula 21a]
Figure imgf000032_0001
[Formula 21b]
Figure imgf000032_0002
[Formula 21c]
Figure imgf000033_0001
[Formula 2 Id]
Figure imgf000033_0002
6. An organic electroluminescent device comprising an organic layer inserted between a pair of electrodes, wherein the organic layer contains the light-emitting compound according to Claim 1, represented by the formula 1.
7. The organic electroluminescent device according to Claim 6, wherein the organic layer is both hole-injecting and -transporting layer and luminescent layer.
8. The organic electroluminescent device according to Claim 6, wherein the organic layer is both electron-injecting and -transporting layer and luminescent layer.
9. The organic electroluminescent device according to Claim 6, wherein the organic layer is formed adjacent to both hole-injecting and -transporting layer and electron-injecting and transporting layer.
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