JP2005082532A - Thiophene compound and organic electroluminescent element containing the same thiophene compound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new thiophene compound and an organic electroluminescent element having long emission lifetime and excellent in endurance. <P>SOLUTION: The thiophene compound is represented by general formula (1) (wherein Ar<SB>1</SB>, Ar<SB>2</SB>, Ar<SB>3</SB>and Ar<SB>4</SB>are each a substituted or unsubstituted aryl group and at least one thereof is a substituted or unsubstituted condensation polycyclic aryl group). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a novel thiophene compound and an organic electroluminescent device comprising the thiophene compound.

Conventionally, an inorganic electroluminescent element has been used as a panel-type light source such as a backlight. However, in order to drive the light emitting element, an alternating high voltage is required. Recently, an organic electroluminescence device (organic electroluminescence device: organic EL device) using an organic material as a luminescent material has been developed [see, for example, Non-Patent Document 1].
An organic electroluminescent device has a structure in which a thin film containing a fluorescent organic compound is sandwiched between an anode and a cathode, and electrons and holes are injected into the thin film and recombined to form an exciton (exington). ) And emits light using light emitted when the exciton is deactivated. The organic electroluminescent element can emit light at a low direct current voltage of several volts to several tens of volts, and various colors (for example, red, blue, green) can be selected by selecting the type of the fluorescent organic compound. ) Can be emitted. The organic electroluminescent element having such characteristics is expected to be applied to various light emitting elements, display elements and the like. However, in general, the luminance is low, which is not sufficient for practical use.
As a method for improving the light emission luminance, an organic electroluminescent element using tris (8-quinolinolato) aluminum as a host material and a coumarin derivative or a pyran derivative as a guest compound (dopant) has been proposed as a light emitting layer. [See Non-Patent Document 2]. In addition, organic electroluminescent elements using anthracene derivatives as the material of the light emitting layer have been proposed (see, for example, Patent Document 1 and Patent Document 2). Furthermore, an organic electroluminescent element using an anthracene derivative as a guest compound of the light emitting layer has also been proposed (see, for example, Patent Document 3 and Patent Document 4).
An organic electroluminescent element using a thiophene derivative as a light emitting material has also been reported (for example, Patent Document 5). However, it cannot be said that these organic electroluminescent elements also have sufficient life characteristics.
At present, higher brightness and longer life are desired.
Appl.Phys.lett., 51,913 (1987) J. Appl. Phys., 65, 3610 (1989) JP-A-8-12600 JP-A-11-111458 Japanese Patent Laid-Open No. 10-36832 JP-A-10-294179 JP-A-5-94876

  An object of the present invention is to provide a novel thiophene compound. More specifically, for example, it is to provide a thiophene compound that can be suitably used as a light-emitting material of an organic electroluminescent element.

  In order to solve the above-mentioned problems, the present inventors have intensively studied various thiophene compounds, in particular, thiophene compounds that can be suitably used as a light emitting material of an organic electroluminescence device, and as a result, the present invention has been completed. It was. That is, the present invention provides <1>: a thiophene compound represented by the general formula (1),

[In General Formula (1), Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ represent a substituted or unsubstituted aryl group, and at least one represents a substituted or unsubstituted condensed polycyclic aryl group]
<2>: The thiophene compound according to <1>, wherein in the general formula (1), all of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ are substituted or unsubstituted condensed polycyclic aryl groups.
<3>: The thiophene compound according to <1> or <2>, wherein in general formula (1), at least one of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ is a group represented by general formula (2) .

[Wherein, among X _{11 to} X ₁₈ , one represents a bond, the rest independently represents a hydrogen atom or a substituent, and R ₁ and R ₂ each independently represent a hydrogen atom or a substituent]
<4>: An organic electroluminescence device comprising at least one layer containing at least one thiophene compound represented by the general formula (1) between a pair of electrodes,
<5>: The organic electroluminescent element according to <4>, wherein the layer containing the thiophene compound represented by the general formula (1) is a light emitting layer.
<6>: The organic electroluminescence device according to <4>, wherein the layer containing the thiophene compound represented by the general formula (1) is a hole injection transport layer,
<7>: The organic electroluminescence device according to <4>, <5>, and <6>, further having a hole injecting and transporting layer between the pair of electrodes.
<8>: The organic electroluminescence device according to any one of <4> to <7>, further comprising an electron injection / transport layer between the pair of electrodes.
It is about.

  According to the present invention, it is possible to provide a novel thiophene compound and an organic electroluminescence device having a long emission lifetime and excellent durability.

Hereinafter, the present invention will be described in detail.
The thiophene compound of the present invention is a compound represented by the general formula (1).

[In General Formula (1), Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ represent a substituted or unsubstituted aryl group, and at least one represents a substituted or unsubstituted condensed polycyclic aryl group]
In the thiophene compound represented by the general formula (1), Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ represent a substituted or unsubstituted aryl group, and at least one represents a substituted or unsubstituted condensed polycyclic aryl group. Represent. Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ preferably represent a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, more preferably a substituted or unsubstituted aryl group having 6 to 25 carbon atoms. Represents.
The substituted or unsubstituted condensed polycyclic aryl group preferably represents a substituted or unsubstituted condensed polycyclic aryl group having 10 to 30 carbon atoms, and more preferably the number of substituted or unsubstituted carbon atoms. 11-28 represents a condensed polycyclic aryl group.

Specific examples of the substituted or unsubstituted aryl group include phenyl group, 5-pyridyl group, 4-pyridyl group, 3-pyridyl group, 2-pyridyl group, 2-pyrimidyl group, 4-pyrimidine group, and 5-pyrimidyl group. 2-pyridazinyl group, 2-pyrazinyl group, 3-furyl group, 2-furyl group, 3-thienyl group, 2-thienyl group, 2-oxazolyl group, 2-thiazolyl group,
4-methylphenyl group, 3-methylphenyl group, 2-methylphenyl group, 4-ethylphenyl group, 3-ethylphenyl group, 2-ethylphenyl group, 4-n-propylphenyl group, 4-isopropylphenyl group, 2-isopropylphenyl group, 4-n-butylphenyl group, 4-isobutylphenyl group, 4-sec-butylphenyl group, 2-sec-butylphenyl group, 4-tert-butylphenyl group, 3-tert-butylphenyl Group, 2-tert-butylphenyl group, 4-n-pentylphenyl group, 4-isopentylphenyl group, 4-tert-pentylphenyl group, 4-n-hexylphenyl group, 4-n-heptylphenyl group, 4 -N-octylphenyl group, 4- (2'-ethylhexyl) phenyl group, 4-tert-octylphenyl group, 4-n-nonylphenyl group, 4 n-decylphenyl group, 4-n-dodecylphenyl group, 4-n-tetradecylphenyl group, 4-n-hexadecylphenyl group, 4-n-octadecylphenyl group, 4-cyclopentylphenyl group, 4-cyclohexylphenyl Group, 4- (4′-tert-butylcyclohexyl) phenyl group, 4- (4′-methylcyclohexyl) phenyl group, 3-cyclohexylphenyl group, 2-cyclohexylphenyl group,
2,3-dimethylphenyl group, 2,4-dimethylphenyl group, 2,5-dimethylphenyl group, 3,4-dimethylphenyl group, 3,5-dimethylphenyl group, 2,6-dimethylphenyl group, 2, 3,5-trimethylphenyl group, 3,4,5-trimethylphenyl group, 2,4-diethylphenyl group, 2,3,6-trimethylphenyl group, 2,4,6-trimethylphenyl group, 2,6- Diethylphenyl group, 2,6-diisopropylphenyl group, 2,6-diisobutylphenyl group, 2,4-di-tert-butylphenyl group, 2,5-di-tert-butylphenyl group, 3,5-di- tert-butylphenyl group, 2,4-dineopentylphenyl group, 2,5-di-tert-pentylphenyl group, 4,6-di-tert-butyl-2-methylphenyl group, 5-tert-butyl- 2 Methylphenyl group, 4-tert-butyl-2,6-dimethylphenyl group, 2,3,5,6-tetramethyl-phenyl group,
5-indanyl group,
4-methoxyphenyl group, 3-methoxyphenyl group, 2-methoxyphenyl group, 4-ethoxyphenyl group, 2-ethoxyphenyl group, 3-n-propyloxyphenyl group, 4-isopropyloxyphenyl group, 2-isopropyloxy Phenyl group, 4-n-butyloxyphenyl group, 4-isobutyloxyphenyl group, 2-isobutyloxyphenyl group, 2-sec-butyloxyphenyl group, 4-n-pentyloxyphenyl group, 4-isopentyloxyphenyl Group, 2-isopentyloxyphenyl group, 2-neopentyloxyphenyl group, 4-n-hexyloxyphenyl group, 2- (2′-ethylbutyloxy) phenyl group, 4-n-octyloxyphenyl group, 4 -N-decyloxyphenyl group, 4-n-dodecyloxyphenyl group, 4 n- tetradecyloxyphenyl group, 4-n- hexadecyl oxyphenyl group, 4-n- octadecyloxyphenyl group, 4-cyclohexyloxy-phenyl group, 2-cyclohexyloxy-phenyl group,
2,3-dimethoxyphenyl group, 2,4-dimethoxyphenyl group, 2,5-dimethoxyphenyl group, 2,6-dimethoxyphenyl group, 3,4-dimethoxyphenyl group, 3,5-dimethoxyphenyl group, 3, 5-diethoxyphenyl group, 3,5-di-n-butyloxyphenyl group, 2-methoxy-4-methylphenyl group, 2-methoxy-5-methylphenyl group, 2-methyl-4-methoxyphenyl group, 3-methyl-4-methoxyphenyl group, 3-methyl-5-methoxyphenyl group, 3-ethyl-5-methoxyphenyl group, 2-methoxy-4-ethoxyphenyl group, 2-methoxy-6-ethoxyphenyl group, 3,4,5-trimethoxyphenyl group,
4-fluorophenyl group, 3-fluorophenyl group, 2-fluorophenyl group, 4-chlorophenyl group, 3-chlorophenyl group, 2-chlorophenyl group, 4-bromophenyl group, 2-bromophenyl group, 2,3-difluoro Phenyl group, 2,4-difluorophenyl group, 2,5-difluorophenyl group, 2,6-difluorophenyl group, 3,4-difluorophenyl group, 3,5-difluorophenyl group, 2,3-dichlorophenyl group, 2,4-dichlorophenyl group, 2,5-dichlorophenyl group, 2,6-dichlorophenyl group, 3,4-dichlorophenyl group, 3,5-dichlorophenyl group, 2,5-dibromophenyl group, 2,4,6-tri Chlorophenyl group, 2,3,6-tribromophenyl group, 3,4,5-trifluorophenyl group,
2-fluoro-4-methylphenyl group, 2-fluoro-5-methylphenyl group, 3-fluoro-2-methylphenyl group, 3-fluoro-4-methylphenyl group, 4-fluoro-2-methylphenyl group, 5-fluoro-2-methylphenyl group, 2-chloro-4-methylphenyl group, 2-chloro-5-methylphenyl group, 2-chloro-6-methylphenyl group, 3-chloro-2-methylphenyl group, 4-chloro-2-methylphenyl group, 4-chloro-3-methylphenyl group, 2-chloro-4,6-dimethylphenyl group, 2-fluoro-4-methoxyphenyl group, 2-fluoro-6-methoxyphenyl Group, 3-fluoro-4-ethoxyphenyl group, 5-chloro-2-methoxyphenyl group, 6-chloro-3-methoxyphenyl group, 5-chloro-2,4- Methoxyphenyl group, 2-chloro-4-nitrophenyl group, 4-chloro-2-nitrophenyl group,
4-trifluoromethylphenyl group, 3-trifluoromethylphenyl group, 2-trifluoromethylphenyl group, 3,5-bis (trifluoromethyl) phenyl group,
4-trifluoromethyloxyphenyl group,
4-allylphenyl group, 2-allylphenyl group, 2-isopropenylphenyl group, 4-benzylphenyl group, 2-benzylphenyl group, 4- (4′-methylbenzyl) phenyl group, 4-cumylphenyl group, 4- (4′-methoxycumyl) phenyl group,
4-phenylphenyl group, 3-phenylphenyl group, 2-phenylphenyl group, 4- (4′-methylphenyl) phenyl group, 4- (4′-ethylphenyl) phenyl group, 4- (4′-isopropylphenyl) ) Phenyl group, 4- (4′-tert-butylphenyl) phenyl group, 4- (4′-n-hexylphenyl) phenyl group, 4- (4′-n-octylphenyl) phenyl group,
4- (4′-methoxyphenyl) phenyl group, 4- (4′-ethoxyphenyl) phenyl group, 4- (4′-n-butoxyphenyl) phenyl group, 2- (2′-methoxyphenyl) phenyl group, 4- (4′-fluorophenyl) phenyl group, 4- (4′-chlorophenyl) phenyl group, 3-methyl-4-phenyl group, 2-methoxy-5-phenylphenyl group, 3-methoxy-4-phenylphenyl Group,
4-methoxymethylphenyl group, 4-ethoxymethylphenyl group, 4-n-butyloxymethylphenyl group, 3-methoxymethylphenyl group, 4- (2′-methoxyethyl) phenyl group, 4- (2′-ethoxy) Ethyloxy) phenyl group, 4- (2′-n-butyloxyethyloxy) phenyl group, 4- (3′-ethoxypropyloxy) phenyl group, 4-vinyloxyphenyl group, 4-allyloxyphenyl group, 3 -Allyloxyphenyl group, 4- (4'-pentenyloxy) phenyl group,
4-allyloxymethylphenyl group, 4- (2′-allyloxyethyloxy) phenyl group,
4-benzyloxyphenyl group, 2-benzyloxyphenyl group, 4-phenethyloxyphenyl group, 4- (4′-chlorobenzyloxy) phenyl group, 4- (4′-methylbenzyloxy) phenyl group, 4- ( 4′-methoxybenzyloxy) phenyl group, 4- (3′-ethoxybenzyloxy) phenyl group, 4- (benzyloxymethyl) phenyl group, 4- (2′-benzyloxyethyloxy) phenyl group,
4-phenyloxyphenyl group, 3-phenyloxyphenyl group, 2-phenyloxyphenyl group, 4- (4′-methylphenyloxy) phenyl group, 4- (4′-methoxyphenyloxy) phenyl group, 4- ( 4′-chlorophenyloxy) phenyl group, 4-phenyloxymethylphenyl group, 4- (2′-phenyloxyethoxy) phenyl group, 4- [2 ′-(4′-methylphenyloxy) ethoxy] phenyl group, 4 -[2 '-(4'-methoxyphenyloxy) ethoxy] phenyl group, 4- [2'-(4'-chlorophenyloxy) ethoxy] phenyl group,
4-acetylphenyl group, 3-acetylphenyl group, 2-acetylphenyl group, 4-ethylcarbonylphenyl group, 2-ethylcarbonylphenyl group, 4-n-butylcarbonylphenyl group, 4-n-hexylcarbonylphenyl group, 4-n-octylcarbonylphenyl group, 4-cyclohexylcarbonylphenyl group, 4-allylcarbonylphenyl group, 4-benzylcarbonylphenyl group, 4- (4′-methylbenzyl) carbonylphenyl group, 4-phenylcarbonylphenyl group, 4- (4′-methylphenyl) carbonylphenyl group, 4- (4′-chlorophenyl) carbonylphenyl group,
4-methoxycarbonylphenyl group, 2-methoxycarbonylphenyl group, 4-ethoxycarbonylphenyl group, 3-ethoxycarbonylphenyl group, 4-n-propyloxycarbonylphenyl group, 4-n-butyloxycarbonylphenyl group, 4- n-hexyloxycarbonylphenyl group, 4-n-decyloxycarbonylphenyl group, 4-cyclohexyloxycarbonylphenyl group, 4-allyloxycarbonylphenyl group, 4-benzyloxycarbonylphenyl group, 4- (4′-chlorobenzyl) ) Oxycarbonylphenyl group, 4-phenethyloxycarbonylphenyl group, 4-phenyloxycarbonylphenyl group, 4- (4'-ethylphenyl) oxycarbonylphenyl group, 4- (4'-chlorophenyl) oxycarbonyl Eniru group, 4- (4'-ethoxyphenyl) oxycarbonyl phenyl group,
4-acetyloxyphenyl group, 3-acetyloxyphenyl group, 2-acetyloxyphenyl group, 4-ethylcarbonyloxyphenyl group, 2-ethylcarbonyloxyphenyl group, 4-n-propylcarbonyloxyphenyl group, 4-n -Pentylcarbonyloxyphenyl group, 4-n-octylcarbonyloxyphenyl group, 4-cyclohexylcarbonyloxyphenyl group, 3-cyclohexylcarbonyloxyphenyl group, 4-allylcarbonyloxyphenyl group, 4-benzylcarbonyloxyphenyl group, 4 -Phenethylcarbonyloxyphenyl group,
4-phenylcarbonyloxyphenyl group, 4- (4′-methylphenyl) carbonyloxyphenyl group, 4- (2′-methylphenyl) carbonyloxyphenyl group, 4- (4′-chlorophenyl) carbonyloxyphenyl group, 4 -(2'-chlorophenyl) carbonyloxyphenyl group,
4-methylthiophenyl group, 2-methylthiophenyl group, 2-ethylthiophenyl group, 3-ethylthiophenyl group, 4-n-propylthiophenyl group, 2-isopropylthiophenyl group, 4-n-butylthiophenyl group 2-isobutylthiophenyl group, 2-neopentylphenyl group, 4-n-hexylthiophenyl group, 4-n-octylthiophenyl group, 4-cyclohexylthiophenyl group,
4-benzylthiophenyl group, 3-benzylthiophenyl group, 2-benzylthiophenyl group, 4- (4′-chlorobenzylthio) phenyl group, 4-phenylthiophenyl group, 3-phenylthiophenyl group, 2- Phenylthiophenyl group, 4- (4'-methylphenylthio) phenyl group, 4- (3'-methylphenylthio) phenyl group, 4- (4'-methoxyphenylthio) phenyl group, 4- (4'- Chlorophenylthio) phenyl group,
4-nitrophenyl group, 3-nitrophenyl group, 2-nitrophenyl group, 3,5-dinitrophenyl, 4-formylphenyl group, 3-formylphenyl group, 2-formylphenyl group,
4-pyrrolidinophenyl group, 4-piperidinophenyl group, 4-morpholinophenyl group, 4- (N-ethylpiperazino) phenyl group,
4-aminophenyl group, 3-aminophenyl group, 2-aminophenyl group,
4- (N-methylamino) phenyl group, 3- (N-methylamino) phenyl group, 4- (N-ethylamino) phenyl group, 2- (N-isopropylamino) phenyl group, 4- (Nn) -Butylamino) phenyl group, 2- (Nn-butylamino) phenyl group, 4- (Nn-octylamino) phenyl group, 4- (Nn-dodecylamino) phenyl group, 4- (N -Benzylamino) phenyl group, 4- (N-phenylamino) phenyl group, 2- (N-phenylamino) phenyl group,
4- (N, N-dimethylamino) phenyl group, 3- (N, N-dimethylamino) phenyl group, 4- (N, N-diethylamino) phenyl group, 2- (N, N-dimethylamino) phenyl group 2- (N, N-diethylamino) phenyl group, 4- (N, N-di-n-butylamino) phenyl group, 4- (N, N-di-n-hexylamino) phenyl group, 4- (N N-cyclohexyl-N-methylamino) phenyl group, 4- (N-benzyl-N-phenylamino) phenyl group, 4- (N, N-diphenylamino) phenyl group, 4- [N-phenyl-N- ( 4-methylphenyl) amino] phenyl group, 4- [N, N-di (3′-methylphenyl) amino] phenyl group, 4- [N, N-di (4′-methylphenyl) amino] phenyl group, 4- [N, N-di (4′- Tokishifeniru) amino] phenyl group, 2-(N, N-diphenylamino) phenyl group,
4-hydroxyphenyl group, 3-hydroxyphenyl group, 2-hydroxyphenyl group, 4-methyl-3-hydroxyphenyl group, 6-methyl-3-hydroxyphenyl group, 4-cyanophenyl group, 2-cyanophenyl group, etc. And substituted or unsubstituted aryl groups.

Specific examples of the substituted or unsubstituted condensed polycyclic aryl group include
1-naphthyl group, 2-naphthyl group, 2-anthracenyl group, 9-anthracenyl group, fluorenyl group, 4-quinolyl group, 2-benzoxazolyl group, 2-benzothiazolyl group, 2-benzimidazolyl group,
4-ethyl-1-naphthyl group, 6-n-butyl-2-naphthyl group,
5-indanyl group, 1,2,3,4-tetrahydro-5-naphthyl group, 1,2,3,4-tetrahydro-6-naphthyl group,
2-methoxy-1-naphthyl group, 4-methoxy-1-naphthyl group, 4-n-butyloxy-1-naphthyl group, 5-ethoxy-1-naphthyl group, 6-ethoxy-2-naphthyl group, 6-n -Butyloxy-2-naphthyl group, 6-n-hexyloxy-2-naphthyl group, 7-methoxy-2-naphthyl group, 7-n-butyloxy-2-naphthyl group,
4-chloro-1-naphthyl group, 4-chloro-2-naphthyl group, 6-bromo-2-naphthyl group, 2,4-dichloro-1-naphthyl group, 1,6-dichloro-2-naphthyl group,
4-allyloxy-1-naphthyl group,
4-benzyloxy-1-naphthyl group, 5- (4′-methylbenzyloxy) -1-naphthyl group, 6-benzyloxy-2-naphthyl group, 6- (4′-methylbenzyloxy) -2-naphthyl Group, 7-benzyloxy-2-naphthyl group,
4-phenyloxy-1-naphthyl group, 6-phenyloxy-2-naphthyl group, 7-phenyloxy-2-naphthyl group, 4-acetyl-1-naphthyl group, 6-acetyl-2-naphthyl group, 6- n-butylcarbonyl-2-naphthyl group, 4-phenylcarbonyl-1-naphthyl group,
4-ethoxycarbonyl-1-naphthyl group, 6-methoxycarbonyl-2-naphthyl group, 6-n-butyloxycarbonyl-2-naphthyl group, 6-phenyloxycarbonyl-2-naphthyl group,
4-acetyloxy-1-naphthyl group, 4-n-butylcarbonyloxy-1-naphthyl group, 5-acetyloxy-1-naphthyl group, 6-ethylcarbonyloxy-2-naphthyl group, 7-acetyloxy-2 -Naphthyl group, 6-benzylcarbonyloxy-2-naphthyl group,
4-phenylcarbonyloxy-1-naphthyl group, 6-phenylcarbonyloxy-2-naphthyl group, 7-phenylcarbonyloxy-2-naphthyl group,
2-ethylthio-1-naphthyl group, 4-methylthio-1-naphthyl group, 6-ethylthio-2-naphthyl group, 6-phenylthio-2-naphthyl group,
4-formyl-1-naphthyl group, 1-formyl-2-naphthyl group,
4-pyrrolidino-1-naphthyl group,
4- (N, N-diethylamino) -1-naphthyl group,
2-hydroxy-1-naphthyl group, 8-hydroxy-1-naphthyl group, 4-hydroxy-1-naphthyl group, 1-hydroxy-2-naphthyl group, 6-hydroxy-2-naphthyl group, 4-cyanophenyl group And substituted or unsubstituted condensed polycyclic aryl groups such as 2-cyanophenyl group, 4-cyano-1-naphthyl group, and 6-cyano-2-naphthyl group.
Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ are preferably all substituted or unsubstituted condensed polycyclic aryl groups, and more preferably at least one of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ is And a fluorene derivative represented by the general formula (2).

[Wherein, one of X _{11 to} X ₁₈ represents a bond, the rest represents a hydrogen atom or a substituent, and R 1 and R 2 represent a hydrogen atom or a substituent]
The substituent for Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ is not particularly limited, but is preferably a halogen atom, cyano group, nitro group, substituted or unsubstituted amino group, ester group, carbon A straight-chain, branched or cyclic alkylcarbonyl group having 1 to 10 atoms, a straight-chain, branched or cyclic alkyl group having 1 to 10 carbon atoms, a straight-chain, branched or cyclic alkoxy group having 1 to 10 carbon atoms A substituted or unsubstituted aralkyl group having 7 to 20 carbon atoms, a substituted or unsubstituted aralkyloxy group having 7 to 20 carbon atoms, a substituted or unsubstituted aryl group having 4 to 20 carbon atoms, or carbon Represents a substituted or unsubstituted aryloxy group having 4 to 20 atoms, more preferably a halogen atom, a cyano group, a nitro group, an ester group, a straight chain having 1 to 8 carbon atoms, Or a cyclic alkylcarbonyl group, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, a linear, branched or cyclic alkoxy group having 1 to 10 carbon atoms, a substitution having 7 to 20 carbon atoms, or An unsubstituted aralkyl group, an aralkyloxy group having 7 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, or a substituted or unsubstituted aryloxy group having 6 to 20 carbon atoms. Represent.

Moreover, the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ may form a ring together with adjacent groups.
Examples of the halogen atom for the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ include a fluorine atom, a chlorine atom and a bromine atom.

The substituted or unsubstituted amino group of the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ includes an amino group, an N-methylamino group, an N-ethylamino group, an Nn-propylamino group, an N -Isopropylamino group, Nn-butylamino group, N-isobutylamino group, N-sec-butylamino group, N-tert-butylamino group, Nn-pentylamino group, N-cyclopentylamino group, N -N-hexylamino group, N-cyclohexylamino group, N-benzylamino group, N-phenethylamino group, N-phenylamino group, N- (1-naphthyl) amino group, N- (2-naphthyl) amino group N- (4-phenylphenyl) amino group, N- (3-phenylphenyl) amino group, N- (2-phenylphenyl) amino group, N- (4-methylphenyl) amino group N- (2-methylphenyl) amino group, N- (2-anthranyl) amino group, N- (9-anthranyl) amino group, N, N-dimethylamino group, N, N-diethylamino group, N, N- Di-n-propylamino group, N, N-di-isopropylamino group, N, N-di-n-butylamino group, N, N-di-isobutylamino group, N, N-di-sec-butylamino Group, N, N-di-n-pentylamino group, N, N-dicyclopentylamino group, N, N-dicyclohexylamino group, N, N-dibenzylamino group, N, N-diphenethylamino group, N -Methyl-N-ethylamino group, N-methyl-Nn-propylamino group, N-methyl-N-isopropylamino group, N-methyl-Nn-butylamino group, N-methyl-N-tert -Butylamino group, N-me Ru-N-cyclopentylamino group, N-methyl-N-cyclohexylamino group, N-methyl-N-benzylamino group, N-methyl-N-phenethylamino group, N-ethyl-N-tert-butylamino group, N-ethyl-N-cyclohexylamino group, N-ethyl-N-benzylamino group, N-isopropyl-N-cyclopentylamino group, N-isopropyl-N-cyclohexylamino group, N-isopropyl-N-benzylamino group, N-tert-butyl-N-cyclohexylamino group, N-tert-butyl-N-benzylamino group, N-cyclopentyl-N-benzylamino group, N-cyclohexyl-N-benzylamino group, N, N-diphenylamino group N, N-di (1-naphthyl) amino group, N, N-di (2-naphthyl) amino group, N, N-di (4-ph Enylphenyl) amino group, N, N- (4-methylphenyl) amino group, N, N-di (3-methylphenyl) amino group, N-phenyl-N- (1-naphthyl) amino group, N-phenyl -N- (2-naphthyl) amino group, N-phenyl-N- (4-phenylphenyl) amino group, N-phenyl-N- (4-methylphenyl) amino group, N- (1-naphthyl) -N A substituted or unsubstituted amino group such as-(4'-phenylphenyl) amino group can be mentioned.

As ester groups for the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ , methoxycarbonyl group, ethoxycarbonyl group, n-propyloxycarbonyl group, isopropyloxycarbonyl group, n-butyloxycarbonyl group, isobutyloxy Carbonyl group, tert-butyloxycarbonyl group, n-pentyloxycarbonyl group, cyclopentyloxycarbonyl group, cyclohexyloxycarbonyl group, benzyloxycarbonyl group, phenyloxycarbonyl group, 1-naphthyloxycarbonyl group, 2-naphthyloxycarbonyl group ,
Acetyloxy group, ethylcarbonyloxy group, n-propylcarbonyloxy group, n-butylcarbonyloxy group, tert-butylcarbonyloxy group, cyclohexylcarbonyloxy group, benzylcarbonyloxy group, phenylcarbonyloxy group, 1-naphthylcarbonyloxy And ester groups such as a 2-naphthylcarbonyloxy group.
As the linear, branched or cyclic alkylcarbonyl group for the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ , a methylcarbonyl group, an ethylcarbonyl group, an n-propylcarbonyl group, an isopropylcarbonyl group, n-butyl Carbonyl group, tert-butylcarbonyl group, n-pentylcarbonyl group, cyclopentylcarbonyl group, n-hexylcarbonyl group, cyclohexylcarbonyl group, n-heptylcarbonyl group, n-octylcarbonyl group, n-nonylcarbonyl group, n-decyl Mention may be made of linear, branched or cyclic alkylcarbonyl groups such as carbonyl groups.

Specific examples of the linear, branched or cyclic alkyl group for the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, Isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, tert-pentyl group, n-hexyl group, 1-methylpentyl group, 4-methyl-2-pentyl group, 2 -Ethylbutyl group, n-heptyl group, 1-methylhexyl group, n-octyl group, 1-methylheptyl group, 2-ethylhexyl group, 2-propylpentyl group, n-nonyl group, 2,2-dimethylheptyl group, 2,6-dimethyl-4-heptyl group, 3,5,5-trimethylhexyl group, n-decyl group, 1-ethyloctyl group, n-undecyl group, 1-methyldecyl group, n Dodecyl group, n-tridecyl group, 1-hexylheptyl group, n-tetradecyl group, n-pentadecyl group, 1-heptyloctyl group, n-hexadecyl group, n-heptadecyl group, 1-octylnonyl group, n-octadecyl group 1-nonyldecyl group, 1-decylundecyl group, n-eicosyl group, n-docosyl group, n-tetracosyl group, cyclohexylmethyl group, (1-isopropylcyclohexyl) methyl group, 2-cyclohexylethyl group, bornel group, isobornel group 1-norbornyl group, 2-norbornanemethyl group, 1-bicyclo [2.2.2] octyl group, 1-adamantyl group, 3-noradamantyl group, 1-adamantylmethyl group, cyclobutyl group, cyclopentyl group, 1- Methylcyclopentyl group, cyclohexyl group, 4-methyl Cyclohexyl group, 3-methylcyclohexyl group, 2-methylcyclohexyl group, 2,3-dimethylcyclohexyl group, 2,5-dimethylcyclohexyl group, 2,6-dimethylcyclohexyl group, 3,4-dimethylcyclohexyl group, 3,5 -Dimethylcyclohexyl group, 2,4,6-trimethylcyclohexyl group, 3,3,5-trimethylcyclohexyl group, 2,6-diisopropylcyclohexyl group, 4-tert-butylcyclohexyl group, 3-tert-butylcyclohexyl group, 4 -Phenylcyclohexyl group, 2-phenylcyclohexyl group, cycloheptyl group, cyclooctyl group, cyclodecyl group, cyclododecyl group, cyclotetradecyl group,
Methoxymethyl group, ethoxymethyl group, n-butoxymethyl group, n-hexyloxymethyl group, (2-ethylbutyloxy) methyl group, n-octyloxymethyl group, n-decyloxymethyl group, 2-methoxyethyl group 2-ethoxyethyl group, 2-n-propyloxyethyl group, 2-isopropyloxyethyl group, 2-n-butyloxyethyl group, 2-n-pentyloxyethyl group, 2-n-hexyloxyethyl group, 2- (2′-ethylbutyloxy) ethyl group, 2-n-heptyloxyethyl group, 2-n-octyloxyethyl group, 2- (2′-ethylhexyloxy) ethyl group, 2-n-decyloxyethyl Group, 2-n-dodecyloxyethyl group, 2-n-tetradecyloxyethyl group, 2-cyclohexyloxyethyl group, 2-meth Cypropyl group, 3-methoxypropyl group, 3-ethoxypropyl group, 3-n-propyloxypropyl group, 3-isopropyloxypropyl group, 3- (n-butyloxy) propyl group, 3- (n-pentyloxy) propyl Group, 3- (n-hexyloxy) propyl group, 3- (2′-ethylbutyloxy) propyl group, 3- (n-octyloxy) propyl group, 3- (2′-ethylhexyloxy) propyl group, 3 -(N-decyloxy) propyl group, 3- (n-dodecyloxy) propyl group, 3- (n-tetradecyloxy) propyl group, 3-cyclohexyloxypropyl group, 4-methoxybutyl group, 4-ethoxybutyl group 4-n-propyloxybutyl group, 4-isopropyloxybutyl group, 4-n-butyloxybutyl group, 4-n- Xyloxybutyl group, 4-n-octyloxybutyl group, 4-n-decyloxybutyl group, 4-n-dodecyloxybutyl group, 5-methoxypentyl group, 5-ethoxypentyl group, 5-n-propyloxy Pentyl group, 6-ethoxyhexyl group, 6-isopropyloxyhexyl group, 6-n-butyloxyhexyl group, 6-n-hexyloxyhexyl group, 6-n-decyloxyhexyl group, 4-methoxycyclohexyl group, 7 -Ethoxyheptyl group, 7-isopropyloxyheptyl group, 8-methoxyoctyl group, 10-methoxydecyl group, 10-n-butyloxydecyl group, 12-ethoxydodecyl group, 12-isopropyloxidedecyl group, tetrahydrofurfuryl group ,
2- (2′-methoxyethoxy) ethyl group, 2- (2′-ethoxyethoxy) ethyl group, 2- (2′-n-butyloxyethoxy) ethyl group, 3- (2′-ethoxyethoxy) propyl group 2-allyloxyethyl group, 2- (4′-pentenyloxy) ethyl group, 3-allyloxypropyl group, 3- (2′-hexenyloxy) propyl group, 3- (2′-heptenyloxy) propyl group, 3- (1′-cyclohexenyloxy) propyl group, 4-allyloxybutyl group,
Benzyloxymethyl group, 2-benzyloxyethyl group, 2-phenethyloxyethyl group, 2- (4′-methylbenzyloxy) ethyl group, 2- (2′-methylbenzyloxy) ethyl group, 2- (4 ′) -Fluorobenzyloxy) ethyl group, 2- (4'-chlorobenzyloxy) ethyl group, 3-benzyloxypropyl group, 3- (4'-methoxybenzyloxy) propyl group, 4-benzyloxybutyl group, 2- (Benzyloxymethoxy) ethyl group, 2- (4′-methylbenzyloxymethoxy) ethyl group,
Phenyloxymethyl group, 4-methylphenyloxymethyl group, 3-methylphenyloxymethyl group, 2-methylphenyloxymethyl group, 4-methoxyphenyloxymethyl group, 4-fluorophenyloxymethyl group, 4-chlorophenyloxymethyl group Group, 2-chlorophenyloxymethyl group, 2-phenyloxyethyl group, 2- (4′-methylphenyloxy) ethyl group, 2- (4′-ethylphenyloxy) ethyl group, 2- (4′-methoxyphenyl) Oxy) ethyl group, 2- (4′-chlorophenyloxy) ethyl group, 2- (4′-bromophenyloxy) ethyl group, 2- (1′-naphthyloxy) ethyl group, 2- (2′-naphthyloxy) ) Ethyl group, 3-phenyloxypropyl group, 3- (2′-naphthyloxy) propyl group, 4-phenyloxy Sibutyl group, 4- (2′-ethylphenyloxy) butyl group, 5- (4′-tert-butylphenyloxy) pentyl group, 6- (2′-chlorophenyloxy) hexyl group, 8-phenyloxyoctyl group, 10-phenyloxydecyl group, 10- (3′-chlorophenyloxy) decyl group, 2- (2′-phenyloxyethoxy) ethyl group, 3- (2′-phenyloxyethoxy) propyl group, 4- (2 ′ -Phenyloxyethoxy) butyl group,
n-butylthiomethyl group, n-hexylthiomethyl group, 2-methylthioethyl group, 2-ethylthioethyl group, 2-n-butylthioethyl group, 2-n-hexylthioethyl group, 2-n-octyl Thioethyl group, 2-n-decylthioethyl group, 3-methylthiopropyl group, 3-ethylthiopropyl group, 3-n-butylthiopropyl group, 4-ethylthiobutyl group, 4-n-propylthiobutyl group 4-n-butylthiobutyl group, 5-ethylthiopentyl group, 6-methylthiohexyl group, 6-ethylthiohexyl group, 6-n-butylthiohexyl group, 8-methylthiooctyl group, 2- (2 ′ -Methoxyethylthio) ethyl group, 4- (3'-ethoxypropylthio) butyl group, 2- (2'-ethylthioethylthio) ethyl group, 2-allylthioethyl group, 2- N-dithioethyl group, 3- (4′-methylbenzylthio) propyl group, 4-benzylthiobutyl group, 2- (2′-benzyloxyethylthio) ethyl group, 3- (3′-benzylthiopropylthio) propyl group ,
2-phenylthioethyl group, 2- (4′-methoxyphenylthio) ethyl group, 2- (2′-phenyloxyethylthio) ethyl group, 3- (2′-phenylthioethylthio) propyl group,
Fluoromethyl group, 3-fluoropropyl group, 6-fluorohexyl group, 8-fluorooctyl group, trifluoromethyl group, 1,1-dihydro-perfluoroethyl group, 1,1-dihydro-perfluoro-n-propyl 1,1,3-trihydro-perfluoro-n-propyl group, 1,1-dihydro-perfluoro-n-butyl group, 1,1-dihydro-perfluoro-n-pentyl group, 1,1- Dihydro-perfluoro-n-hexyl group, 6-fluorohexyl group, 4-fluorocyclohexyl group, 1,1-dihydro-perfluoro-n-octyl group, 1,1-dihydro-perfluoro-n-decyl group, 1,1-dihydro-perfluoro-n-dodecyl group, 1,1-dihydro-perfluoro-n-tetradecyl group, 1,1-dihydro-per Fluoro-n-hexadecyl group, perfluoro-n-hexyl group, dichloromethyl group, 2-chloroethyl group, 3-chloropropyl group, 4-chlorocyclohexyl group, 7-chloroheptyl group, 8-chlorooctyl group, 2, 2,2-trichloroethyl group,
2-hydroxyethyl group, 2-hydroxypropyl group, 3-hydroxypropyl group, 3-hydroxybutyl group, 4-hydroxybutyl group, 6-hydroxyhexyl group, 5-hydroxyheptyl group, 8-hydroxyoctyl group, 10- Examples thereof include linear, branched or cyclic alkyl groups such as hydroxydecyl group, 12-hydroxydodecyl group and 2-hydroxycyclohexyl group.

Specific examples of the linear, branched or cyclic alkoxy group for the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ include, for example, a linear chain derived from the above linear, branched or cyclic alkyl group. And branched or cyclic alkoxy groups.

Specific examples of the substituted or unsubstituted aralkyl group of the substituents Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ include benzyl group, α-methylbenzyl group, α-ethylbenzyl group, phenethyl group, α-methyl. Phenethyl group, β-methylphenethyl group, α, α-dimethylbenzyl group, α, α-dimethylphenethyl group, 4-methylphenethyl group, 4-methylbenzyl group, 3-methylbenzyl group, 2-methylbenzyl group, 4 -Ethylbenzyl group, 2-ethylbenzyl group, 4-isopropylbenzyl group, 4-tert-butylbenzyl group, 2-tert-butylbenzyl group, 4-tert-pentylbenzyl group, 4-cyclohexylbenzyl group, 4-n -Octylbenzyl group, 4-tert-octylbenzyl group, 4-allylbenzyl group, 4-benzylbenzyl group, 4-phenethylbenzyl Group, 4-phenylbenzyl group, 4- (4′-methylphenyl) benzyl group, 4-methoxybenzyl group, 2-methoxybenzyl group, 2-ethoxybenzyl group, 4-n-butoxybenzyl group, 4-n- Heptyloxybenzyl group,
4-n-decyloxybenzyl group, 4-n-tetradecyloxybenzyl group, 4-n-heptadecyloxybenzyl group,
3,4-dimethoxybenzyl group, 4-methoxymethylbenzyl group, 4-isobutyloxymethylbenzyl group, 4-allyloxybenzyl group, 4-vinyloxymethylbenzyl group, 4-benzyloxybenzyl group, 4-phenethyloxybenzyl Group, 4-phenyloxybenzyl group, 3-phenyloxybenzyl group,
4-hydroxybenzyl group, 3-hydroxybenzyl group, 2-hydroxybenzyl group, 4-hydroxy-3-methoxybenzyl group, 4-fluorobenzyl group, 2-fluorobenzyl group, 4-chlorobenzyl group, 3-chlorobenzyl And substituted or unsubstituted aralkyl groups such as a group, 2-chlorobenzyl group, 3,4-dichlorobenzyl group, 2-furfuryl group, diphenylmethyl group, 1-naphthylmethyl group, and 2-naphthylmethyl group. .

Specific examples of the substituted or unsubstituted aralkyloxy group of the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ include, for example, a substituted or unsubstituted aralkyl group derived from the above substituted or unsubstituted aralkyl group. Mention may be made of aralkyloxy groups.

_{Ar 1,} Ar 2, substituents Ar ₃ and Ar _4, Specific examples of the substituted or unsubstituted aryl _{group, Ar 1, Ar 2, Ar} 3 and specific of a substituted or unsubstituted aryl group Ar ₄ Mention may be made, by way of example, of substituted or unsubstituted aryl groups.

Specific examples of the substituted or unsubstituted aryloxy group for the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ include, for example, a substituted or unsubstituted aryloxy group derived from the above aryl group. be able to.

In the thiophene compound represented by the general formula (1), it is preferable that at least one of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ is a thiophene compound which is a group represented by the general formula (2).

[In General Formula (2), one of X _{11 to} X ₁₈ represents a bond, the rest independently represents a hydrogen atom or a substituent, and R ₁ and R ₂ each independently represent a hydrogen atom or (Represents a substituent)
In the group represented by the general formula (2), one of X _{11 to} X ₁₈ represents a bond, and the rest each independently represents a hydrogen atom or a substituent, preferably a hydrogen atom, a halogen atom, A cyano group, a nitro group, a substituted or unsubstituted amino group, an ester group, a linear, branched or cyclic alkylcarbonyl group having 1 to 10 carbon atoms, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, Straight chain, branched or cyclic alkoxy group having 1 to 10 carbon atoms, substituted or unsubstituted aralkyl group having 7 to 20 carbon atoms, substituted or unsubstituted aralkyloxy group having 7 to 20 carbon atoms, and 4 to 20 carbon atoms Represents a substituted or unsubstituted aryl group or a substituted or unsubstituted aryloxy group having 4 to 20 carbon atoms, more preferably a hydrogen atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted An unsubstituted amino group, a linear, branched or cyclic alkylcarbonyl group having 1 to 8 carbon atoms, a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms, a linear, branched or cyclic group having 1 to 8 carbon atoms Cyclic alkoxy group, substituted or unsubstituted aralkyl group having 7 to 16 carbon atoms, substituted or unsubstituted aralkyloxy group having 7 to 16 carbon atoms, substituted or unsubstituted aryl group having 4 to 16 carbon atoms, or carbon number 4 to 16 substituted or unsubstituted aryloxy groups are represented.

In the group represented by the general formula (2),
Specific examples of the halogen atom represented by X _{11 to} X ₁₈ include the halogen atoms exemplified in the specific examples of the halogen atom in the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ .
Specific examples of the substituted or unsubstituted amino group of X _{11 to} X ₁₈ include the substituents listed as specific examples of the substituted or unsubstituted amino group of the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ An unsubstituted amino group can be mentioned.

Specific examples of the ester group of X _{11 to} X ₁₈ include the ester groups mentioned as specific examples of the ester group of the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ .
Specific examples of the linear, branched or cyclic alkylcarbonyl group of X _{11 to} X ₁₈ include specific examples of the linear, branched or cyclic alkylcarbonyl group of the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar _4. The linear, branched or cyclic alkylcarbonyl group mentioned as an example can be mentioned.

Specific examples of the linear, branched or cyclic alkyl group of X _{11 to} X ₁₈ include specific examples of the linear, branched or cyclic alkyl group of the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar _4. Examples thereof include linear, branched or cyclic alkyl groups.

Specific examples of the linear, branched or emotional alkoxy group of X _{11 to} X ₁₈ are derived from a linear, branched or cyclic alkyl group of the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar _4. Linear, branched or cyclic alkoxy groups can be raised.

Specific examples of the substituted or unsubstituted aralkyl group of X _{11 to} X ₁₈ include the substituents listed as specific examples of the substituted or unsubstituted aralkyl group of the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ An unsubstituted aralkyl group can be mentioned.

Specific examples of the substituted or unsubstituted aralkyloxy group for X _{11 to} X ₁₈ include a substituted or unsubstituted aralkyl group derived from a substituted or unsubstituted aralkyl group of Ar ₁ , Ar ₂ , Ar ₃ and Ar _4. A substituted aralkyloxy group can be mentioned.

Specific examples of the substituted or unsubstituted aryl group represented by X _{11 to} X ₁₈ include the substituents listed as specific examples of the substituted or unsubstituted aryl group of the substituents Ar ₁ , Ar ₂ , Ar ₃ and Ar _4. Or an unsubstituted aryl group can be mentioned.

Specific examples of the substituted or unsubstituted aryloxy group represented by X _{11 to} X ₁₈ include substituted or unsubstituted derivatives derived from a substituted or unsubstituted aryl group of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ substituents. Of aryloxy groups.

In the group represented by the general formula (2), R ₁ and R ₂ represent a hydrogen atom or a substituent, preferably a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or a carbon number. A substituted or unsubstituted aralkyl group having 7 to 20 carbon atoms or a substituted or unsubstituted aryl group having 4 to 20 carbon atoms is represented.
Specific examples of the linear, branched or cyclic alkyl group for R ₁ and R ₂ include specific examples of the linear, branched or cyclic alkyl group for the substituent of Ar ₁ , Ar ₂ , Ar ₃ and Ar _4. Examples thereof include linear, branched or cyclic alkyl groups.

Specific examples of the substituted or unsubstituted aralkyl group of R ₁ and R ₂ include the substituents listed as specific examples of the substituted or unsubstituted aralkyl group of the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ Or an unsubstituted aralkyl group can be mentioned.
Specific examples of the substituted or unsubstituted aryl group for R ₁ and R ₂ include the substituents listed as specific examples of the substituted or unsubstituted aryl group for the substituents of Ar ₁ , Ar ₂ , Ar ₃ and Ar _4. Or an unsubstituted aryl group can be mentioned.

Specific examples of the substituted or unsubstituted aryl group represented by the general formula (2) include, for example,
9H-fluoren-2-yl group, 7-methyl-9H-fluoren-2-yl group, 7-tert-butyl-9H-fluoren-2-yl group, 7-cyclohexyl-9H-fluoren-2-yl group, 7-phenyl-9H-fluoren-2-yl group, 9-methyl-9H-fluoren-2-yl group, 7-methyl-9H-fluoren-2-yl group, 7-phenyl-9H-fluoren-2-yl group Group, 7-tert-butyl-9H-fluoren-2-yl group, 9-ethyl-9H-fluoren-2-yl group, 9-n-propyl-9H-fluoren-2-yl group, 9-cyclohexyl-9H -Fluoren-2-yl group, 9-phenyl-9H-fluoren-2-yl group, 9,9-dimethyl-9H-fluoren-2-yl group, 7-methyl-9,9-dimethyl-9H-fluorene- 2-yl group, 7-phenyl-9,9-dimethyl-9H-fluoren-2-yl group, 7-cyclohexyl-9,9-dimethyl-9H-fluoren-2-yl group, 7-tert-butyl-9 , 9-dimethyl-9H-fluoren-2-yl group, 7-cyano-9,9-dimethyl-9H-fluoren-2-yl group, 7-chloro-9,9-dimethyl-9H-fluoren-2-yl group Group, 7-N, N-dimethylamino-9,9-dimethyl-9H-fluoren-2-yl group, 7-N, N-diethylamino-9,9-diethyl-9H-fluoren-2-yl group, 7 -N, N-dimethylamino-9,9-dicyclohexyl-9H-fluoren-2-yl group, 9,9-diethyl-9H-fluoren-2-yl group, 9,9-di-n-propyl-9H- Fluoren-2-yl group, , 9-Diisopropyl-9H-fluoren-2-yl group, 9,9-di-n-butyl-9H-fluoren-2-yl group, 9,9-di-n-hexyl-9H-fluoren-2- Yl group, 9,9-di-n-octyl-9H-fluoren-2-yl group, 9,9-dicyclopentyl-9H-fluoren-2-yl group, 9,9-dicyclohexyl-9H-fluorene-2- Yl group, 9,9-dibenzyl-9H-fluoren-2-yl group, 9,9-diphenyl-9H-fluoren-2-yl group, 7-methyl-9,9-diphenyl-9H-fluoren-2-yl Group, 7-phenyl-9,9-diphenyl-9H-fluoren-2-yl group, 7-tert-butyl-9,9-diphenyl-9H-fluoren-2-yl group, 7-cyclohexyl-9,9- Diphenyl-9 -Fluoren-2-yl group, 9,9- (4'-N, N-dimethylaminophenyl) -9H-fluoren-2-yl group, 9,9- (4'-methoxyphenyl) -9H-fluorene- 2-yl group, 9,9- (4′-phenoxyphenyl) -9H-fluoren-2-yl group, 9,9- (4′-n-propyloxyphenyl) -9H-fluoren-2-yl group, 9,9- (4′-cyclohexyloxyphenyl) -9H-fluoren-2-yl group, 9,9- [4 ′-(1 ″ -adamantyloxy) phenyl] -9H-fluoren-2-yl group, 9 , 9-dimethyl-9H-fluoren-1-yl group and 9,9-dimethyl-9H-fluoren-3-yl group.

  Specific examples of the thiophene compound represented by the general formula (1) according to the present invention include the following compounds (Chemical Formula 6 to Chemical Formula 14), but the present invention is limited to these. is not.

The thiophene compound represented by the general formula (1) of the present invention can be produced by, for example, the following steps.
Production of a thiophene compound represented by the general formula (1) (Formula 15).

[Wherein Ar represents the same meaning as Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ in formula (1), and L ₁ and L ₂ represent a halogen atom]
That is, a halogenothiophene derivative represented by the general formula (A) and a boronic acid derivative represented by the general formula (B) are converted into a palladium catalyst [for example, tetrakis (triphenylphosphine) palladium, palladium acetate / tri-tert-butyl Phosphine] and a base (for example, an organic base such as triethylamine and pyridine, and an inorganic base such as sodium carbonate and potassium carbonate) are reacted to produce the thiophene compound (1) represented by the general formula (1). be able to.

Next, the organic electroluminescent element of the present invention will be described. The organic electroluminescent element of the present invention is obtained by sandwiching at least one layer containing at least one thiophene compound represented by the general formula (1) between a pair of electrodes. An organic electroluminescent element is usually formed by sandwiching at least one light emitting layer containing at least one light emitting component between a pair of electrodes. A hole injection / transport layer and / or an electron injection containing a hole injection component as desired, considering the functional level of the hole injection and hole transport, electron injection and electron transport of the compound used in the light emitting layer. An electron injecting and transporting layer containing a transporting component can also be provided.
For example, when the hole injection function, the hole transport function and / or the electron injection function, and the electron transport function of the compound used in the light emitting layer are good, the light emitting layer is a hole injection transport layer and / or an electron injection transport layer. As a type of element configuration that also serves as a single layer type element configuration. Further, when the light emitting layer is poor in the hole injection function and / or the hole transport function, a two-layer device configuration in which a hole injection transport layer is provided on the anode side of the light emitting layer, the light emitting layer has an electron injection function and / or Alternatively, when the electron transport function is poor, a two-layer device structure in which an electron injection transport layer is provided on the cathode side of the light emitting layer can be obtained. Furthermore, a three-layer device structure in which the light-emitting layer is sandwiched between a hole injecting and transporting layer and an electron injecting and transporting layer can be used.
In addition, each of the hole injecting and transporting layer, the electron injecting and transporting layer, and the light emitting layer may have a single layer structure or a multilayer structure, and the hole injecting and transporting layer and the electron injecting and transporting layer The layer having an injection function and the layer having a transport function can be separately provided.
In the organic electroluminescence device of the present invention, the thiophene compound represented by the general formula (1) is preferably used as a component of the hole injection transport layer and / or the light emitting layer, and is used as a component of the light emitting layer. It is more preferable.
In the organic electroluminescent element of the present invention, the thiophene compound represented by the general formula (1) may be used alone or in combination.

  The configuration of the organic electroluminescent device of the present invention is not particularly limited. For example, (EL-1) anode / hole injection transport layer / light emitting layer / electron injection transport layer / cathode type device (FIG. 1). ), (EL-2) anode / hole injection transport layer / light emitting layer / cathode type device (FIG. 2), (EL-3) anode / light emitting layer / electron injection transport layer / cathode type device (FIG. 3), EL-4) Anode / light emitting layer / cathode type element (FIG. 4), and the like. Further, an EL (EL-5) anode / hole injection / transport layer / electron injection / transport layer / light-emitting layer / electron injection / transport layer / cathode-type device (FIG. 5) in which the light-emitting layer is sandwiched between electron injection / transport layers. You can also. The (EL-4) type element structure includes an element of a type in which a light emitting component is sandwiched between a pair of electrodes as a light emitting layer, (EL-6) a hole injection transport component as a light emitting layer, A device of a type in which a light emitting component and an electron injection component are mixed and sandwiched between a pair of electrodes (FIG. 6), (EL-7) a layer in which a hole injection transport component and a light emitting component are mixed as a light emitting layer Type element sandwiched between a pair of electrodes in a form (FIG. 7), (EL-8) type element sandwiched between a pair of electrodes in a single layer form in which a light emitting component and an electron injection component are mixed as a light emitting layer Any of (FIG. 8) may be sufficient.

  The organic electroluminescent device of the present invention is not limited to these device configurations, and each type of device can be provided with a plurality of hole injection / transport layers, light emitting layers, and electron injection / transport layers. Further, in each type of device, the hole injection / transport layer is disposed between the light emitting layer, the hole injection / transport component and the light emitting component mixed layer and / or the light emitting layer and the electron injection / transport layer between the light emitting component and the light emitting component. And a mixed layer of electron injecting and transporting components can be provided.

  A preferred organic electroluminescent element is an (EL-1) type element, an (EL-2) type element, an (EL-5) type element, an (EL-6) type element or an (EL-7) type element. More preferably, it is an (EL-1) type element, an (EL-2) type element or an (EL-7) type element.

  Hereinafter, the components of the organic electroluminescence device of the present invention will be described in detail. As an example, (EL-1) anode / hole injection / transport layer / light emitting layer / electron injection / transport layer / cathode type device shown in FIG. 1 will be described.

In FIG. 1, 1 is a substrate, 2 is an anode, 3 is a hole injecting and transporting layer, 4 is a light emitting layer, 5 is an electron injecting and transporting layer, 6 is a cathode, and 7 is a power source.
The organic electroluminescent element of the present invention is preferably supported by the substrate 1, and the substrate is not particularly limited, but a transparent or translucent substrate is preferable, and the material is soda lime glass, Examples thereof include glass such as borosilicate glass and transparent polymers such as polyester, polycarbonate, polysulfone, polyethersulfone, polyacrylate, polymethyl methacrylate, polypropylene, and polyethylene. Further, a substrate made of a translucent plastic sheet, quartz, transparent ceramics, or a composite sheet in which these are combined can also be used. Furthermore, for example, a color filter film, a color conversion film, and a dielectric reflection film can be combined with the substrate to control the emission color.
As the anode 2, it is preferable to use a metal, an alloy or a conductive compound having a relatively large work function as an electrode material. Examples of the electrode material used for the anode include gold, platinum, silver, copper, cobalt, nickel, palladium, vanadium, tungsten, indium oxide (In ₂ O ₃ ), tin oxide (SnO ₂ ), zinc oxide, ITO ( Indium tin oxide (Indium Tin Oxide), polythiophene, polypyrrole, etc. can be mentioned. These electrode materials may be used alone or in combination.
For the anode, these electrode materials can be formed on the substrate by a method such as vapor deposition or sputtering.
Further, the anode may have a single layer structure or a multilayer structure. The sheet electrical resistance of the anode is preferably set to several hundred Ω / □ or less, more preferably about 5 to 50 Ω / □.
The thickness of the anode is generally about 5 to 1000 nm, more preferably about 10 to 500 nm, although it depends on the material of the electrode material used.
The hole injection transport layer 3 is a layer containing a compound having a function of facilitating the injection of holes from the anode and a function of transporting the injected holes.
The hole injecting and transporting layer may be a thiophene compound represented by the general formula (1), or other compounds having a hole injecting and transporting function (for example, phthalocyanine derivatives, triarylamine derivatives, triarylmethane derivatives, oxazole derivatives, hydrazones). Derivatives, stilbene derivatives, pyrazoline derivatives, polysilane derivatives, polyphenylene vinylene and derivatives thereof, polythiophene and derivatives thereof, poly-N-vinylcarbazole, and the like).
The compounds having a hole injecting and transporting function may be used alone or in combination.

  The organic electroluminescent element of the present invention preferably contains a thiophene compound represented by the general formula (1) in the hole injecting and transporting layer. Examples of the compound having a hole injecting and transporting function other than the thiophene compound represented by the general formula (1) of the present invention that can be used in the organic electroluminescence device of the present invention include triarylamine derivatives (for example, 4,4 '-Bis [N-phenyl-N- (4 "-methylphenyl) amino] biphenyl, 4,4'-bis [N-phenyl-N- (3" -methylphenyl) amino] biphenyl, 4,4'- Bis [N-phenyl-N- (3 ″ -methoxyphenyl) amino] biphenyl, 4,4′-bis [N-phenyl-N- (1 ″ -naphthyl) amino] biphenyl, 3,3′-dimethyl-4 , 4′-bis [N-phenyl-N- (3 ″ -methylphenyl) amino] biphenyl, 1,1-bis [4 ′-[N, N-di (4 ″ -methylphenyl) amino] phenyl] cyclohexane Sun, 9,10-bis [N- (4'-methylphenyl) -N- (4 "-n-butylphenyl) amino] phenanthrene, 3,8-bis (N, N-diphenylamino) -6-phenyl Phenanthridine, 4-methyl-N, N-bis [4 ", 4" '-bis [N', N'-di (4-methylphenyl) amino] biphenyl-4-yl] aniline, N, N ' -Bis [4- (diphenylamino) phenyl] -N, N'-diphenyl-1,3-diaminobenzene, N, N'-bis [4- (diphenylamino) phenyl] -N, N'-diphenyl-1 , 4-diaminobenzene, 5,5 "-bis [4- (bis [4-methylphenyl] amino) phenyl-2,2 ': 5', 2" -terthiophene, 1,3,5-tris (N , N-diphenylamino) benzene, 4 4 ', 4 "-tris (N-carbazolyl) triphenylamine, 4,4', 4" -tris [N, N-bis (4 "'-tert-butylbiphenyl-4" "-yl) amino] tri More preferred are polythiophene and its derivatives, poly-N-vinylcarbazole and its derivatives, such as phenylamine, 1,3,5-tris (4′-N, N-diphenylaminophenyl] benzene.

When the thiophene compound represented by the general formula (1) and another compound having a hole injection function are used in combination, the content of the thiophene compound represented by the general formula (1) in the hole injection transport layer is: Preferably, it is 0.1% by weight or more, more preferably 0.5 to 99.9% by weight, still more preferably 3 to 97% by weight.
The light emitting layer 4 is a layer containing a compound having a function of injecting holes and electrons, a function of transporting them, and a function of generating excitons by recombination of holes and electrons.

The light emitting layer is formed using the thiophene compound represented by the general formula (1) as a host material and at least one compound having a light emitting function other than the thiophene compound represented by the general formula (1) as a guest material. In addition, a compound having a light emitting function other than the thiophene compound represented by the general formula (1) is used as at least one host material, and the thiophene compound represented by the general formula (1) is used as a guest material. It can also be formed.
Preferably, a thiophene compound represented by the general formula (1) is used as a host material, and a compound having a light emitting function other than the thiophene compound represented by the general formula (1) is used as at least one guest material.
As a compound (guest material / host material) having a light emitting function other than the thiophene compound represented by the general formula (1), for example, an acridone derivative, a quinacridone derivative, a diketopyrrolopyrrole derivative, a polycyclic aromatic compound [for example, Rubrene, anthracene, tetracene, pyrene, perylene, chrysene, decacyclene, coronene, tetraphenylcyclopentadiene, pentaphenylcyclopentadiene, 9,10-diphenylanthracene, 9,10-bis (phenylethynyl) anthracene, 1,4-bis ( 9'-ethynylanthcenyl) benzene, 4,4'-bis (9 "-ethynylanthracenyl) biphenyl, dibenzo [f, f] diindeno [1,2,3-cd: 1 ', 2', 3 '-lm] perylene derivatives], triarylamine derivatives (for example, hole injection and transport functions) Examples of the compound include the aforementioned compounds), organometallic complexes [for example, tris (8-quinolinolato) aluminum, bis (10-benzo [h] quinolinolato) beryllium, 2- (2′-hydroxyphenyl) benzothiazole Zinc salt, zinc salt of 4-hydroxyacridine, zinc salt of 3-hydroxyflavone, beryllium salt of 5-hydroxyflavone, aluminum salt of 5-hydroxyflavone], stilbene derivative [eg 1,1,4,4-tetra Phenyl-1,3-butadiene, 4,4′-bis (2,2-diphenylvinyl) biphenyl, 4,4′-bis [(1,1,2-triphenyl) ethenyl] biphenyl], coumarin derivatives (for example, , Coumarin 1, Coumarin 6, Coumarin 7, Coumarin 30, Coumarin 106, Coumarin 38, coumarin 151, coumarin 152, coumarin 153, coumarin 307, coumarin 311, coumarin 314, coumarin 334, coumarin 338, coumarin 343, coumarin 500), pyran derivatives (eg, DCM1, DCM2), oxazone derivatives (eg, Nile Red) ), Benzothiazole derivatives, benzoxazole derivatives, benzimidazole derivatives, pyrazine derivatives, cinnamic acid ester derivatives, poly-N-vinylcarbazole and derivatives thereof, polythiophene and derivatives thereof, polyphenylene and derivatives thereof, polyfluorene and derivatives thereof, polyphenylene Vinylene and derivatives thereof, polybiphenylene vinylene and derivatives thereof, polyterphenylene vinylene and derivatives thereof, polynaphthylene vinylene and Examples thereof include polythienylene vinylene and derivatives thereof. Compounds having a light emitting function other than the thiophene compound represented by the general formula (1) (guest material / host material) include acridone derivatives, quinacridone derivatives, polycyclic aromatic compounds, triarylamine derivatives, organometallic complexes, and stilbenes. Derivatives are preferred, and polycyclic aromatic compounds and organometallic complexes are more preferred.
When the thiophene compound represented by the general formula (1) is used as a host material in combination with another compound having a light emitting function (guest material), the inclusion of the thiophene compound represented by the general formula (1) in the light emitting layer The rate is preferably 99.9-80% by weight, more preferably 99-90% by weight.
In this case, the host material may be used alone or in combination, and when a plurality of host materials are used in combination, the host material occupies the entire host material of the thiophene compound represented by the general formula (1) of the present invention. The proportion is preferably 99 to 10% by weight, more preferably 90 to 20% by weight.
Further, when the thiophene compound represented by the general formula (1) is used as a guest material in combination with another compound having a light emitting function (host material), the thiophene compound represented by the general formula (1) in the light emitting layer The content of is preferably 0.1 to 20% by weight, more preferably 1 to 10% by weight.
In this case, the guest material may be used alone or in combination, and when a plurality of guest materials are used in combination, the ratio of the thiophene compound represented by the general formula (1) of the present invention to the entire guest material Is preferably 99 to 10% by weight, more preferably 90 to 0% by weight.

  The electron injection / transport layer 5 is a layer containing a compound having a function of facilitating injection of electrons from the cathode and / or a function of transporting injected electrons.

  Examples of the compound having an electron injecting function used in the electron injecting and transporting layer include organometallic complexes, oxadiazole derivatives, triazole derivatives, triazine derivatives, perylene derivatives, quinoline derivatives, quinoxaline derivatives, diphenylquinone derivatives, nitro-substituted fluorenones. Derivatives, thiopyrandioxide derivatives and the like can be mentioned. Examples of organometallic complexes include organoaluminum complexes such as tris (8-quinolinolato) aluminum, organic beryllium complexes such as bis (10-benzo [h] quinolinolato) beryllium, beryllium salts of 5-hydroxyflavone, 5- Examples thereof include an aluminum salt of hydroxyflavone. An organoaluminum complex is preferable, and an organoaluminum complex having a substituted or unsubstituted 8-quinolinolato ligand is more preferable. Examples of the organoaluminum complex having a substituted or unsubstituted 8-quinolinolate ligand include compounds represented by general formulas (a) to (c).

(Q) ₃ -Al (a)
(Wherein Q represents a substituted or unsubstituted 8-quinolinolate ligand)
(Q) ₂ -Al-OL '(b)
(In the formula, Q represents a substituted or unsubstituted 8-quinolinolate ligand, OL ′ represents a phenolate ligand, and L ′ represents a hydrocarbon group having 6 to 24 carbon atoms having a phenyl group. )
(Q) _2- Al-O-Al- (Q) ₂ (c)
(Wherein Q represents a substituted or unsubstituted 8-quinolinolate ligand)
Specific examples of the organoaluminum complex having a substituted or unsubstituted 8-quinolinolato ligand include, for example, tris (8-quinolinolato) aluminum, tris (4-methyl-8-quinolinolato) aluminum, tris (5-methyl- 8-quinolinolato) aluminum, tris (3,4-dimethyl-8-quinolinolato) aluminum, tris (4,5-dimethyl-8-quinolinolato) aluminum, tris (4,6-dimethyl-8-quinolinolato) aluminum,
Bis (2-methyl-8-quinolinolato) (phenolate) aluminum, bis (2-methyl-8-quinolinolato) (2-methylphenolato) aluminum, bis (2-methyl-8-quinolinolato) (3-methylphenolate) ) Aluminum, bis (2-methyl-8-quinolinolato) (4-methylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (2-phenylphenolato) aluminum, bis (2-methyl-8-quinolinolato) ) (3-phenylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (4-phenylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (2,3-dimethylphenolate) aluminum, Bis (2-methyl-8-quinolinolate) ( , 6-Dimethylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (3,4-dimethylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (3,5-dimethylphenolate) aluminum Bis (2-methyl-8-quinolinolato) (3,5-di-tert-butylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (2,6-diphenylphenolato) aluminum, bis (2 -Methyl-8-quinolinolato) (2,4,6-triphenylphenolate) aluminum, bis (2-methyl-8-quinolinolato) (2,4,6-trimethylphenolato) aluminum, bis (2-methyl- 8-quinolinolato) (2,4,5,6-tetramethylphenolate) aluminum, bi (2-methyl-8-quinolinolato) (1-naphtholato) aluminum, bis (2-methyl-8-quinolinolato) (2-naphtholato) aluminum, bis (2,4-dimethyl-8-quinolinolato) (2-phenyl) Phenolate) aluminum, bis (2,4-dimethyl-8-quinolinolato) (3-phenylphenolate) aluminum, bis (2,4-dimethyl-8-quinolinolato) (4-phenylphenolate) aluminum, bis (2 , 4-dimethyl-8-quinolinolato) (3,5-dimethylphenolate) aluminum, bis (2,4-dimethyl-8-quinolinolato) (3,5-di-tert-butylphenolate) aluminum,
Bis (2-methyl-8-quinolinolato) aluminum-μ-oxo-bis (2-methyl-8-quinolinolato) aluminum, bis (2,4-dimethyl-8-quinolinolato) aluminum-μ-oxo-bis (2, 4-dimethyl-8-quinolinolato) aluminum, bis (2-methyl-4-ethyl-8-quinolinolato) aluminum-μ-oxo-bis (2-methyl-4-ethyl-8-quinolinolato) aluminum, bis (2- Methyl-4-methoxy-8-quinolinolato) aluminum-μ-oxo-bis (2-methyl-4-methoxy-8-quinolinolato) aluminum, bis (2-methyl-5-cyano-8-quinolinolato) aluminum-μ- Oxo-bis (2-methyl-5-cyano-8-quinolinolato) aluminum, bi (2-methyl-5-trifluoromethyl-8-quinolinolato) aluminum-μ-oxo-bis (2-methyl-5-trifluoromethyl-8-quinolinolato) aluminum.
A compound having an electron injection function may be used alone or in combination.

  As the cathode 6, it is preferable to use a metal, an alloy or a conductive compound having a relatively small work function as an electrode material. Examples of the electrode material used for the cathode include lithium, lithium-indium alloy, sodium, sodium-potassium alloy, calcium, magnesium, magnesium-silver alloy, magnesium-indium alloy, indium, ruthenium, titanium, manganese, yttrium, and aluminum. , Aluminum-lithium alloys, aluminum-calcium alloys, aluminum-magnesium alloys, and graphite thin films. These electrode materials may be used alone or in combination.

For the cathode, these electrode materials can be formed on the electron injecting and transporting layer by, for example, vapor deposition, sputtering, ion vapor deposition, ion plating, or cluster ion beam.
The cathode may have a single layer structure or a multilayer structure. The sheet electrical resistance of the cathode is preferably several hundred Ω / □ or less. The thickness of the cathode is usually 5 to 1000 nm, preferably 10 to 500 nm, although it depends on the electrode material used. In order to take out light emitted from the organic electroluminescence device of the present invention with high efficiency, at least one of the anode and the cathode is preferably transparent or translucent, and generally has a transmittance of emitted light of 70% or more. Thus, it is preferable to set the material and thickness of the anode or cathode.
The organic electroluminescent device of the present invention may contain a singlet oxygen quencher in at least one of the hole injection transport layer, the light emitting layer, and the electron injection transport layer. Although it does not specifically limit as a singlet oxygen quencher, For example, rubrene, a nickel complex, diphenylisobenzofuran is mentioned, Preferably it is rubrene.

The layer containing the singlet oxygen quencher is not particularly limited, but is preferably a light emitting layer or a hole injection transport layer, and more preferably a hole injection transport layer. When a singlet oxygen quencher is contained in the hole injecting and transporting layer, it may be uniformly contained in the hole injecting and transporting layer, and a layer adjacent to the hole injecting and transporting layer (for example, a light emitting layer, a light emitting function). May be contained in the vicinity of the electron injecting and transporting layer).
The content of the singlet oxygen quencher is 0.01 to 50% by weight, preferably 0.05 to 30% by weight, based on the total amount constituting the layer to be contained (for example, hole injection transport layer). Preferably, it is 0.1 to 20% by weight.

The formation method of the hole injection transport layer, the light emitting layer, and the electron injection transport layer is not particularly limited. For example, a vacuum deposition method, an ionization deposition method, a solution coating method (for example, a spin coating method, a casting method, A dip coat method, a bar coat method, a roll coat method, a Langmuir-Blodget method, an ink jet method) can be used. When forming each layer such as a hole injecting and transporting layer, a light emitting layer, and an electron injecting and transporting layer by a vacuum deposition method, the conditions for vacuum deposition are not particularly limited, but a vacuum of about 10 ⁻⁵ Torr or less is usually used. Below, it is preferable to carry out at a boating temperature (deposition source temperature) of about 50 to 500 ° C., a substrate temperature of about −50 to 300 ° C., and a deposition rate of about 0.005 to 50 nm / sec. In this case, each layer such as a hole injecting and transporting layer, a light emitting layer, and an electron injecting and transporting layer is preferably formed continuously under vacuum. It becomes possible to manufacture an organic electroluminescent element excellent in various characteristics by forming continuously. When each layer such as hole injection transport layer, light emitting layer, electron injection transport layer, etc. is formed using a plurality of compounds by vacuum deposition, the temperature of each boat containing the compounds is individually controlled and co-evaporated. It is preferable to do.

  When each layer is formed by a solution coating method, the component forming each layer or the component and a binder resin are dissolved or dispersed in a solvent to obtain a coating solution. Examples of the solvent include organic solvents (hexane solvents such as hexane, octane, decane, toluene, xylene, ethylbenzene, and 1-methylnaphthalene, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, dichloromethane, and chloroform. , Halogenated hydrocarbon solvents such as tetrachloromethane, dichloroethane, trichloroethane, tetrachloroethane, chlorobenzene, dichlorobenzene, chlorotoluene, ester solvents such as ethyl acetate, butyl acetate, amyl acetate, ethyl lactate, methanol, propanol, butanol Alcohol solvents such as pentanol, hexanol, cyclohexanol, methyl cellosolve, ethyl cellosolve, ethylene glycol, dibutyl ether, tetrahydro Ether solvents such as ethylene, dioxane, dimethoxyethane, anisole, N, N-dimethylformamide, N, N-dimethylacetamide, 1-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, dimethyl sulfoxide And polar solvents) and water. A solvent may be used independently and may be used together. When the components of the hole injecting and transporting layer, the light emitting layer, and the electron injecting and transporting layer are dispersed in a solvent, for example, a ball mill, a sand mill, a paint shaker, an attritor, a homogenizer or the like is used as a dispersion method. Can be used.

  Examples of binder resins that can be used in each layer such as a hole injecting and transporting layer, a light emitting layer, and an electron injecting and transporting layer include poly-N-vinylcarbazole, polyarylate, polystyrene, polyester, polysiloxane, polymethyl methacrylate, poly Methyl acrylate, polyether, polycarbonate, polyamide, polyimide, polyamideimide, polyparaxylene, polyethylene, polyphenylene oxide, polyethersulfone, polyaniline and derivatives thereof, polythiophene and derivatives thereof, polyphenylene vinylene and derivatives thereof, polyfluorene and derivatives thereof, Examples thereof include polymer compounds such as polythienylene vinylene and its derivatives. Binder resins may be used alone or in combination. The concentration of the coating solution is not particularly limited, but can be set to a concentration range suitable for producing a desired thickness by the coating method to be carried out, usually 0.1 to 50% by weight, preferably 1 to 30% by weight. When a binder resin is used, the amount used is not particularly limited, but it is usually based on the total amount of components and binder resin that form each layer such as a hole injection transport layer, a light emitting layer, and an electron injection transport layer. The binder resin is used so that the content of the binder resin is 5 to 99.9% by weight, preferably 10 to 99% by weight (relative to the total amount of each component when a single-layer element is formed).

The film pressure of each layer such as the hole injecting and transporting layer, the light emitting layer, and the electron injecting and transporting layer is not particularly limited, but is usually 5 nm to 5 μm.
The organic electroluminescent device of the present invention produced under the above conditions is provided with a protective layer (sealing layer) for the purpose of preventing contact with oxygen, moisture, etc. For example, it can be protected by enclosing it in paraffin, liquid paraffin, silicon oil, fluorocarbon oil, zeolite-containing fluorocarbon oil). Examples of the material used for the protective layer include organic polymer materials (for example, fluorine resin, epoxy resin, silicone resin, epoxy silicone resin, polystyrene, polyester, polycarbonate, polyamide, polyimide, polyamideimide, polyparaxylene, polyethylene, Polyphenylene oxide), inorganic materials (for example, diamond thin film, amorphous silica, electrically insulating glass, metal oxide, metal nitride, metal carbide, metal sulfide), and photocurable resin. The material used for the protective layer may be used alone or in combination. The protective layer may have a single layer structure or a multilayer structure.
Moreover, the organic electroluminescent element of this invention can also provide a metal oxide film (for example, aluminum oxide film) and a metal fluoride film as a protective film in an electrode.
The organic electroluminescent element of the present invention can also be provided with an interface layer (intermediate layer) on the surface of the anode. Examples of the material for the interface layer include organic phosphorus compounds, polysilanes, aromatic amine derivatives, and phthalocyanine derivatives.
Furthermore, the surface of an electrode, for example, an anode, can be used by treating the surface with acid, ammonia / hydrogen peroxide, or plasma.

  The organic electroluminescent element of the present invention can be usually used as a DC drive type element, but can also be used as an AC drive type element. Further, the organic electroluminescence device of the present invention may be a segment type, a passive drive type such as a simple matrix drive type, or an active drive type such as a TFT (thin film transistor) type or an MIM (metal-insulator-metal) type. It may be. The driving voltage is usually 2 to 30V. The organic electroluminescent element of the present invention is a panel type light source (for example, a backlight for a clock, a liquid crystal panel, etc.), various light emitting elements (for example, an alternative to a light emitting element such as an LED, an alternative to illumination (incandescent lamp / fluorescent lamp)). It can be used for various display elements [for example, information display elements (personal computer monitors, mobile phone / mobile terminal display elements)], various signs, various sensors, and the like.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further in detail, this invention is not limited to a following example.

Production of Exemplified Compound 7 2,5-dibromo-3,4-diphenylthiophene 3.94 g (0.01 mol), 9,9-dimethyl-9H-fluorene-2-boronic acid 4.76 g (0.02 mol), carbonic acid To a mixture consisting of 4.24 g of sodium, 40 g of toluene and 40 g of water, 200 mg of tetrakis (triphenylphosphine) palladium was added under an argon stream, heated to 100 ° C., and heated and stirred at the same temperature for 8 hours. The reaction mixture was cooled to room temperature, the toluene phase was separated, washed with water, and toluene was distilled off from the toluene phase under reduced pressure. The residue was purified by silica gel column chromatography and further recrystallized from isopropanol / toluene to obtain 4.3 g of the target compound of Exemplified Compound 7.

Production of Exemplified Compound 10 2,3,4,5-tetrabromothiophene 4.00 g (0.01 mol), 9,9-dimethyl-9H-fluorene-2-boronic acid 9.52 g (0.04 mol), sodium carbonate Under a stream of argon, 400 mg of tetrakis (triphenylphosphine) palladium was added to a mixture consisting of 8.48 g, 40 g of toluene and 40 g of water, heated to 100 ° C., and heated and stirred at the same temperature for 8 hours. The reaction mixture was cooled to room temperature, the toluene phase was separated, washed with water, and toluene was distilled off from the toluene phase under reduced pressure. The residue was purified by silica gel column chromatography, and further recrystallized from isopropanol / toluene to obtain 5.8 g of the target exemplified compound 10.

Preparation of Exemplary Compound 12 In Example 1, instead of using 4.76 g (0.02 mol) of 9,9-dimethyl-9H-fluorene-2-boronic acid, 9,9-di-n-butyl-9H— Except for using 6.44 g (0.02 mol) of fluorene-2-boronic acid, 5.2 g of Exemplified Compound 12 was obtained according to the procedure described in Example 1.

Production of Exemplified Compound 16,
Instead of using 3.94 g (0.01 mol) of 2,5-dibromo-3,4-diphenylthiophene in Example 1, 2,5-dibromo-3,4-bis (4′-phenylphenyl) thiophene 4.7 g of Exemplified Compound 16 was obtained according to the procedure described in Example 1 except that 5.46 g (0.01 mol) was used.

Production of Organic Electroluminescent Device A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried with nitrogen gas, further UV / ozone cleaned, fixed to a substrate holder of a vapor deposition apparatus, and the vapor deposition tank was depressurized to 3 × 10 ⁻⁶ Torr. First, 4,4′-bis (N-phenyl-N-1 ″ -naphthylamino) -1,1′-biphenyl was deposited on the ITO transparent electrode to a thickness of 75 nm at a deposition rate of 0.2 nm / sec. Next, a hole injection / transport layer was formed on the hole injection / transport layer as a light-emitting layer, and the compound of Exemplified Compound 7 and 4,4′-bis [2 ″-(4 ″ ′-N, N— Diphenylaminophenyl) vinyl] biphenyl was deposited at a deposition rate of 2.0 nm / sec and 0.02 to 0.1 nm / sec to a thickness of 40 nm to form a light emitting layer. Further, tris (8 -Quinolinolato) Aluminum was vapor deposited at a deposition rate of 0.2 nm / sec to a thickness of 15 nm to form an electron injecting and transporting layer, and further, magnesium and silver as a cathode were deposited at 200 nm at a deposition rate of 0.2 nm / sec. Thickness of The organic electroluminescence device was produced by co-evaporation (weight ratio 10: 1) to produce a cathode, and the deposition was carried out while maintaining the reduced pressure state of the vapor deposition tank. Applied, and continuously driven at a constant current density of 10 mA / cm ² at room temperature in a dry atmosphere, initially, a voltage value of 5.4 V and blue light emission with a luminance of 860 cd / m ² was confirmed. The half life of the luminance was 2000 hours.

In Example 5, an organic electroluminescent device was prepared according to the procedure described in Example 5 except that the compound of Illustrative Example Compound 10 was used instead of the compound of Illustrative Compound 7 when forming the light emitting layer. . Further, a direct current voltage was applied to the device in the same manner as in Example 5 to measure the characteristics of the device, and the results are shown in Table 1 (Table 1).

In Example 5, an organic electroluminescent device was prepared according to the procedure described in Example 5 except that the compound of Exemplified Compound 12 was used instead of the compound of Illustrated Compound 7 in forming the light emitting layer. Further, in the same manner as in Example 5, a DC voltage was applied to the device, the characteristics of the device were measured, and the results are shown in Table 1 (Table 1).

In Example 5, an organic electroluminescent device was prepared according to the procedure described in Example 5 except that the compound of Exemplified Compound 16 was used instead of the compound of Illustrated Compound 7 in forming the light emitting layer. Further, in the same manner as in Example 5, a DC voltage was applied to the device, the characteristics of the device were measured, and the results are shown in Table 1 (Table 1).

Comparative Example 1:
In Example 5, in the formation of the light emitting layer, instead of using the compound of Exemplary Compound 7, 4,4′-bis (2 ″, 2 ″ -diphenylvinyl) biphenyl was used, except that the compound described in Example 5 was used. According to the operation, an organic electroluminescent device was produced. The characteristics of blue light emission confirmed from the device were further investigated, and the results are shown in Table 1 (Table 1).

Comparative Example 2:
In Example 5, an organic electroluminescent device was produced according to the procedure described in Example 5 except that 9,10-diphenylanthracene was used instead of using the compound of Illustrative Compound 7 when forming the light emitting layer. The characteristics of blue light emission confirmed from the device were further investigated, and the results are shown in Table 1 (Table 1).

Comparative Example 3:
In Example 5, the procedure described in Example 5 was used except that 9,10-bis (3 ′, 5′-diphenylphenyl) anthracene was used in place of the compound of Exemplary Compound 7 in forming the light emitting layer. According to the above, an organic electroluminescent element was produced. The characteristics of blue light emission confirmed from the device were further investigated, and the results are shown in Table 1 (Table 1).

A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using a nitrogen gas, was further subjected to UV / ozone cleaning, it was fixed to a substrate holder of the vapor deposition apparatus, followed by vacuum vapor deposition tank 1.2 × 10- ⁶ Torr.
On the ITO transparent electrode, 1,3,5-tris (4′-N ′, N′-diphenylaminophenyl) benzene was deposited at a deposition rate of 0.1 nm / sec to a thickness of 20 nm to form a first hole. An injection transport layer was formed. Next, 4,4 ′-[N-phenyl-N- (1′-naphthyl) amino] -1,1′-biphenyl was deposited to a thickness of 50 nm at a deposition rate of 0.2 nm / sec, and the second hole An injection transport layer was formed. Next, the compound of Exemplified Compound 7 and the compound (DP) represented by the following formula are deposited on the hole injecting and transporting layer to a thickness of 40 nm at a deposition rate of 0.2 nm / sec and 0.02 nm / sec, respectively. Then, a light emitting layer was formed. Further, tris (8-quinolinolato) aluminum was deposited on the light emitting layer at a deposition rate of 0.2 nm / sec to a thickness of 50 nm to form an electron injecting and transporting layer. Furthermore, aluminum and lithium were co-deposited as a cathode at a deposition rate of 0.2 nm / sec to a thickness of 200 nm (weight ratio 10: 1) to form an organic electroluminescent device. In addition, vapor deposition was implemented, maintaining the pressure reduction state of a vapor deposition tank. A DC voltage was applied to the produced organic electroluminescence device, and the organic electroluminescence device was continuously driven at a constant current density of 10 mA / cm ² in a dry atmosphere. Initially, red light emission of 5.6 V and luminance of 1000 cd / m ² was confirmed. The half life of the brightness was 5000 hours.

A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using a nitrogen gas, was further subjected to UV / ozone cleaning, it was fixed to a substrate holder of the vapor deposition apparatus, followed by vacuum vapor deposition tank 1.2 × 10- ⁶ Torr.
On the ITO transparent electrode, 1,3,5-tris (4′-N ′, N′-diphenylaminophenyl) benzene was deposited at a deposition rate of 0.1 nm / sec to a thickness of 20 nm to form a first hole. An injection transport layer was formed. Next, 4,4 ′-[N-phenyl-N- (1′-naphthyl) amino] -1,1′-biphenyl was deposited to a thickness of 50 nm at a deposition rate of 0.2 nm / sec, and the second hole An injection transport layer was formed. Next, 9,10-diphenylanthracene and Exemplified Compound 10 are deposited on the hole injecting and transporting layer at a deposition rate of 0.2 nm / sec and 0.02 nm / sec to a thickness of 40 nm to form a light emitting layer. Further, tris (8-quinolinolato) aluminum was deposited on the light emitting layer at a deposition rate of 0.2 nm / sec to a thickness of 50 nm to form an electron injecting and transporting layer. Furthermore, aluminum and lithium were co-deposited as a cathode at a deposition rate of 0.2 nm / sec to a thickness of 200 nm (weight ratio 10: 1) to form an organic electroluminescent device. In addition, vapor deposition was implemented, maintaining the pressure reduction state of a vapor deposition tank. A DC voltage was applied to the produced organic electroluminescence device, and the organic electroluminescence device was continuously driven at a constant current density of 10 mA / cm ² in a dry atmosphere. Initially, blue light emission of 5.8 V and luminance of 960 cd / m ² was confirmed. The half life of luminance was 3200 hours.

Production of Organic Electroluminescent Device A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using nitrogen gas, further UV / ozone cleaned, fixed to the substrate holder of the vapor deposition apparatus, and the vapor deposition tank was depressurized to 3 × 10 ⁻⁶ Torr.
First, poly (thiophene-2,5-diyl) was deposited on the ITO transparent electrode at a deposition rate of 0.1 nm / sec to a thickness of 20 nm to form a first hole injection transport layer. Next, 4,4′-bis [N-phenyl-N- (1′-naphthyl) amino] -1,1′-biphenyl was deposited to a thickness of 55 nm at a deposition rate of 0.2 nm / sec. A hole injection transport layer was formed. Next, 4,4′-bis (2 ″, 2 ″ -diphenylvinyl) -1,1′-biphenyl and Example Compound 12 are deposited on the hole injecting and transporting layer at a deposition rate of 0.2 nm / sec, respectively. A light-emitting layer was formed by vapor deposition at a thickness of 40 nm at 0.02 nm / sec. Further, tris (8-quinolinolato) aluminum was vapor-deposited on the light-emitting layer to a thickness of 50 nm at a vapor deposition rate of 0.2 nm / sec. An electron injecting and transporting layer was formed. Further, magnesium and silver were co-deposited as a cathode at a deposition rate of 0.2 nm / sec to a thickness of 200 nm (weight ratio 10: 1) to form an organic electroluminescent device. In addition, vapor deposition was implemented, maintaining the pressure reduction state of a vapor deposition tank. A DC voltage was applied to the produced organic electroluminescence device, and the organic electroluminescence device was continuously driven at a constant current density of 10 mA / cm ² in a dry atmosphere. Initially, green light emission of 5.4 V and luminance of 920 cd / m ² was confirmed. The half life of luminance was 2100 hours.

Production of Organic Electroluminescent Device A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using nitrogen gas, further washed with UV / ozone, fixed to the substrate holder of the vapor deposition apparatus, and the vapor deposition tank was depressurized to 3 × 10 ⁻⁶ Torr. First, 4,4 ′, 4 ″ -tris [N- (3 ″ -methylphenyl) -N-phenylamino] triphenylamine is deposited on an ITO transparent electrode at a deposition rate of 0.1 nm / sec and a thickness of 50 nm. To form a first hole injection transport layer. Next, 4,4′-bis [N-phenyl-N- (1-naphthyl) amino] -1,1′-biphenyl was vapor-deposited at a deposition rate of 0.2 nm / sec to a thickness of 20 nm. A hole injection transport layer was formed. Further, a compound represented by exemplary compound 16 was deposited thereon at a thickness of 40 nm at 0.1 nm / sec to form a light emitting layer. Next, tris (8-quinolinolato) aluminum was vapor-deposited thereon to a thickness of 50 nm at a vapor deposition rate of 0.2 nm / sec to form an electron injecting and transporting layer. Further, magnesium and silver were co-deposited as a cathode at a deposition rate of 0.2 nm / sec to a thickness of 200 nm (weight ratio 10: 1) to form an organic electroluminescent device. A DC voltage was applied to the produced organic electroluminescence device, and the organic electroluminescence device was continuously driven at a constant current density of 10 mA / cm ² in a dry atmosphere. Initially, blue light emission of 5.6 V and a luminance of 930 cd / m ² was confirmed. The half life of luminance was 2100 hours.

Production of Organic Electroluminescent Device A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using nitrogen gas, further washed with UV / ozone, fixed to the substrate holder of the vapor deposition apparatus, and the vapor deposition tank was depressurized to 3 × 10 ⁻⁶ Torr. First, poly (thiophene-2,5-diyl) was deposited on the ITO transparent electrode at a deposition rate of 0.1 nm / sec to a thickness of 20 nm to form a first hole injection transport layer. After returning the vapor deposition tank to atmospheric pressure, the vapor deposition tank was again decompressed to 3 × 10 ⁻⁶ Torr. Next, the compound of Exemplified Compound 10 and rubrene were co-deposited from different vapor deposition sources to a thickness of 55 nm at a vapor deposition rate of 0.2 nm / sec (weight ratio 10: 1), and the second hole injection transport layer was also provided. A light emitting layer was formed. Next, while maintaining the reduced pressure state, tris (8-quinolinolato) aluminum was deposited thereon to a thickness of 50 nm at a deposition rate of 0.2 nm / sec to form an electron injecting and transporting layer. While maintaining the reduced pressure state, magnesium and silver were further co-deposited as a cathode to a thickness of 200 nm at a deposition rate of 0.2 nm / sec (weight ratio 10: 1) to form a cathode, and an organic electroluminescent device Was made. A DC voltage was applied to the produced organic electroluminescent element, and the organic electroluminescent element was continuously driven at a constant current density of 10 mA / cm ^{2 in} a dry atmosphere. Initially, yellow light emission of 5.6 V and luminance of 940 cd / m ² was confirmed. The luminance half-life was 2400 hours.

Production of Organic Electroluminescent Device A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using nitrogen gas, further washed with UV / ozone, fixed to the substrate holder of the vapor deposition apparatus, and the vapor deposition tank was depressurized to 3 × 10 ⁻⁶ Torr. First, Exemplified Compound 7 was deposited on the ITO transparent electrode at a deposition rate of 0.1 nm / sec to a thickness of 20 nm to form a first hole injection transport layer. After returning the vapor deposition tank to atmospheric pressure, the vapor deposition tank was again decompressed to 3 × 10 ⁻⁶ Torr. Next, the compound of Exemplified Compound 10 and rubrene were co-deposited from different vapor deposition sources to a thickness of 55 nm at a vapor deposition rate of 0.2 nm / sec (weight ratio 10: 1), and the second hole injection transport layer was also provided. A light emitting layer was formed. Next, tris (8-quinolinolato) aluminum was deposited thereon to a thickness of 50 nm at a deposition rate of 0.2 nm / sec to form an electron injecting and transporting layer. Further, magnesium and silver were co-deposited as a cathode at a deposition rate of 0.2 nm / sec to a thickness of 200 nm (weight ratio 10: 1) to form an organic electroluminescent device. In addition, vapor deposition was implemented, maintaining the pressure reduction state of a vapor deposition tank. A DC voltage was applied to the produced organic electroluminescence device, and the organic electroluminescence device was continuously driven at a constant current density of 10 mA / cm ^{2 in} a dry atmosphere. Initially, yellow light emission of 5.5 V and luminance of 910 cd / m ² was confirmed. The half life of luminance was 2100 hours.

Production of Organic Electroluminescent Device A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using nitrogen gas and further UV / ozone cleaned. Next, on the ITO transparent electrode, a 40 nm hole is formed by spin coating using a 3 wt% dichloroethane solution containing a compound of polycarbonate (weight average molecular weight 39000) and exemplary compound 12 in a weight ratio of 100: 50. An injection transport layer was formed. Next, the glass substrate having this hole injecting and transporting layer was fixed to the substrate holder of the vapor deposition apparatus, and the vapor deposition layer was decompressed to 3 × 10 ⁻⁶ Torr. Next, tris (8-quinolinolato) aluminum was vapor-deposited thereon to a thickness of 50 nm at a vapor deposition rate of 0.2 nm / sec to form a light-emitting layer also serving as an electron injecting and transporting layer. Further, magnesium and silver were co-deposited as a cathode at a deposition rate of 0.2 nm / sec to a thickness of 200 nm (weight ratio 10: 1) to form an organic electroluminescent device. When a DC voltage of 10 V was applied to the produced organic electroluminescent element in a dry atmosphere, a current of 83 mA / cm ² flowed. Green light emission with a luminance of 790 cd / m ² was confirmed. The half life of luminance was 400 hours.

Production of Organic Electroluminescent Device A glass substrate having an ITO transparent electrode (anode) having a thickness of 200 nm was subjected to ultrasonic cleaning using a neutral detergent, Semico Clean (manufactured by Furuuchi Chemical), ultrapure water, acetone, and ethanol. The substrate was dried using nitrogen gas and further UV / ozone cleaned. Next, on the ITO transparent electrode, polymethyl methacrylate (weight average molecular weight 25000), the compound of Exemplified Compound 7 and tris (8-quinolinolato) aluminum are respectively contained in a weight ratio of 100: 50: 0.5 3 A light emitting layer having a thickness of 100 nm was formed by spin coating using a weight% dichloroethane solution. Next, the glass substrate having the light emitting layer was fixed to a substrate holder of a vapor deposition apparatus, and the vapor deposition layer was decompressed to 3 × 10 ⁻⁶ Torr. On the light emitting layer, magnesium and silver were co-deposited at a deposition rate of 0.2 nm / sec to a thickness of 200 nm as a cathode (weight ratio 10: 1) to form a cathode, and an organic electroluminescent device was produced. When a DC voltage of 15 V was applied to the produced organic electroluminescent element in a dry atmosphere, a current of 81 mA / cm ² flowed. Green light emission with a luminance of 770 cd / m ² was confirmed. The half life of luminance was 400 hours.

According to the present invention, it is possible to provide a novel thiophene compound and an organic electroluminescence device using the thiophene compound, having a long emission lifetime and excellent durability.

It is a cross-sectional schematic diagram of an example of an organic electroluminescent element. It is a cross-sectional schematic diagram of an example of an organic electroluminescent element. It is a cross-sectional schematic diagram of an example of an organic electroluminescent element. It is a cross-sectional schematic diagram of an example of an organic electroluminescent element. It is a cross-sectional schematic diagram of an example of an organic electroluminescent element. It is a cross-sectional schematic diagram of an example of an organic electroluminescent element. It is a cross-sectional schematic diagram of an example of an organic electroluminescent element. It is a cross-sectional schematic diagram of an example of an organic electroluminescent element.

Explanation of symbols

1: Substrate 2: Anode 3: Hole injection / transport layer 3a: Hole injection / transport component 4: Light emitting layer 4a: Light emission component 5: Electron injection / transport layer 5 ″: Electron injection / transport layer 5a: Electron injection / transport component 6: Cathode 7: Power supply

Claims (8)

The thiophene compound represented by General formula (1).

[In General Formula (1), Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ represent a substituted or unsubstituted aryl group, and at least one represents a substituted or unsubstituted condensed polycyclic aryl group] The thiophene compound according to claim ₁ , wherein in the general formula (1), all of Ar ₁ , Ar ₂ , Ar _3, and Ar ₄ are substituted or unsubstituted condensed polycyclic aryl groups. The thiophene compound according to claim 1 or 2, wherein in the general formula (1), at least one of Ar ₁ , Ar ₂ , Ar ₃ and Ar ₄ is a group represented by the general formula (2).

[Wherein, among X _{11 to} X ₁₈ , one represents a bond, the rest independently represents a hydrogen atom or a substituent, and R ₁ and R ₂ each independently represent a hydrogen atom or a substituent] An organic electroluminescence device comprising at least one layer containing at least one thiophene compound represented by the general formula (1) between a pair of electrodes. The organic electroluminescent element according to claim 4, wherein the layer containing the thiophene compound represented by the general formula (1) is a light emitting layer. The organic electroluminescent element according to claim 4, wherein the layer containing the thiophene compound represented by the general formula (1) is a hole injection transport layer. The organic electroluminescent element according to claim 4, 5 and 6, further comprising a hole injecting and transporting layer between the pair of electrodes. The organic electroluminescent element according to claim 4, further comprising an electron injecting and transporting layer between the pair of electrodes.

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