WO2009142230A1

WO2009142230A1 - Anthracene derivative and organic electroluminescent device using the same

Info

Publication number: WO2009142230A1
Application number: PCT/JP2009/059253
Authority: WO
Inventors: 光則伊藤; 河村　昌宏
Original assignee: 出光興産株式会社
Priority date: 2008-05-20
Filing date: 2009-05-20
Publication date: 2009-11-26
Also published as: JPWO2009142230A1

Abstract

Disclosed is an anthracene derivative represented by formula (1) or (2) (excluding a compound represented by formula (1')). (In the formulae, Ar₁-Ar₆ each represents a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group; Ar₁ is bonded to one of substitution positions 1-4 of the anthracene ring, and Ar₂ is bonded to one of substitution positions 5-8; Ar₄ and Ar₅ are both bonded to one of substitution positions 1-4 of the anthracene ring; a hydrogen atom or an alkyl group having 1-3 carbon atoms is bonded to each carbon atom on the anthracene skeleton to which Ar₁-Ar₆ are not bonded.)

Description

Anthracene derivative and organic electroluminescence device using the same

The present invention relates to a novel anthracene derivative useful as a light-emitting material of an organic electroluminescence device and an organic electroluminescence device using the same.

An organic electroluminescence (EL) element is a self-luminous element utilizing the principle that a light-emitting material emits light by recombination energy of holes injected from an anode and electrons injected from a cathode when an electric field is applied.
Organic EL devices have made remarkable progress, and organic EL devices have features such as low-voltage driving, high brightness, diversity of emission wavelengths, high-speed response, and the ability to produce thin and light-emitting devices. Application to applications is expected.

Luminescent materials used in organic EL elements have been actively studied since they have a great influence on the color of light emitted from the elements and the emission lifetime.
As the light-emitting material, one that emits light by a single substance or one that emits light by adding a small amount of dopant to a host material is known. In addition to fluorescent materials, it has been studied to use phosphorescent compounds as light emitting materials and to use triplet state energy for light emission. With such various light emitting materials, light emission in a visible region from blue to red is obtained.

For example, Patent Documents 1 and 2 disclose anthracene derivatives substituted at positions 2, 9, and 10 as light emitting materials. Patent Document 3 discloses an anthracene derivative substituted at the 1,9,10-position.

An object of the present invention is to provide a novel luminescent material and an organic EL element using the luminescent material.

U.S. Pat. No. 7,326,371 WO2006 / 025700 JP 2005-289921 A

According to the present invention, the following anthracene derivatives, organic EL devices and the like are provided.
1. Anthracene derivatives represented by the following formula (1) or (2) (excluding compounds represented by the following formula (1 ′)).

(In the formula, Ar ₁ to Ar ₃ are each a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group. Ar ₁ is any one of the substitution positions 1 to 4 of the anthracene ring. And Ar ₂ is bonded to any of the substitution positions 5 to 8. The carbon atom on the anthracene skeleton to which Ar ₁ to Ar ₃ is not bonded is a hydrogen atom or an alkyl having 1 to 3 carbon atoms, respectively. Group is substituted.)

(Wherein Ar ₄ to Ar ₆ are each a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group. Ar ₄ and Ar ₅ are both substituted positions on the anthracene ring. Bonded to any of 1 to 4. Hydrogen or an alkyl group having 1 to 3 carbon atoms is bonded to the carbon atom on the anthracene skeleton to which Ar ₄ to Ar ₆ are not bonded.

(In the formula, Ar ₁ to Ar ₃ are the same as those in the formula (1).)
2. 2. The anthracene derivative according to 1, represented by the following formulas (3) to (6):

(Wherein Ar ₁ to Ar ₆ are the same groups as 1)
3. A light emitting material comprising the anthracene derivative according to 1 or 2 above.
4). 4. The light emitting material according to 3, wherein the anthracene derivative is a host material.
5). Organic electroluminescence comprising an anode, a cathode, and one or more organic thin film layers sandwiched between the anode and the cathode, wherein at least one of the organic thin film layers contains the anthracene derivative according to 1 or 2 element.
6). 6. The organic electroluminescence device according to 5, wherein the layer containing the anthracene derivative further contains at least one of a phosphorescent dopant and a fluorescent dopant.
7). 7. The organic electroluminescence device according to 6, wherein the fluorescent dopant is at least one of an arylamine compound, a styrylamine compound, and a fluoranthene compound.
8). 8. The organic electroluminescence device according to 6 or 7, wherein the phosphorescent dopant is a metal complex.
9. 5. An organic electroluminescent material-containing solution containing the light emitting material according to 3 or 4 above.
10. 10. An organic electroluminescence device produced using the organic electroluminescence material-containing solution described in 9 above.

ADVANTAGE OF THE INVENTION According to this invention, the organic EL element obtained using a novel anthracene derivative and the luminescent material which consists of this, the organic EL material containing solution containing a luminescent material, and an organic EL material containing solution can be provided.
The organic EL device using the anthracene derivative of the present invention has an excellent lifetime.

It is a schematic sectional drawing of one Embodiment of the organic EL element of this invention.

The anthracene derivative of the present invention is a compound represented by the following formula (1) or (2). However, the anthracene derivative of the present invention does not include a compound represented by the following formula (1 ′).

In the formula, Ar ₁ to Ar ₆ are each a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group. Hydrogen or an alkyl group having 1 to 3 carbon atoms (methyl, ethyl, propyl) is bonded to each carbon atom on the anthracene skeleton to which Ar ₁ to Ar ₆ are not bonded.
In the formula (1), Ar ₁ is bonded to any of the substitution positions 1 to 4 of the anthracene ring, and Ar ₂ is bonded to any of the substitution positions 5 to 8.
In the formula (2), Ar ₄ and Ar ₅ are both bonded to any one of the substitution positions 1 to 4 of the anthracene ring.
The anthracene substitution positions are as follows. Ar ₃ or Ar ₆ is bonded to substitution position 9.

Examples of the substituted or unsubstituted aromatic hydrocarbon group represented by Ar ₁ to Ar ₆ include a substituted or unsubstituted phenyl group, indenyl group, fluorenyl group, naphthyl group, anthryl group, phenanthryl group, naphthacenyl group, acenaphthylenyl group, biphenyl group , A chrysenyl group, a pyrenyl group, a triphenyl group, a fluoranthenyl group, a perylenyl group, and a naphthyl group, a phenanthryl group, a chrysenyl group, a pyrenyl group, a triphenyl group, a fluorenyl group, and a terphenyl group. Specifically, phenyl group, 6-indenyl group, 7-indenyl group, 1-fluorenyl group, 2-fluorenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 9- Anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 9-phenanthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 5-naphthacenyl group, 3-acenaphthylenyl group, 4- Acenaphthylenyl group, 2-biphenyl group, 3-biphenyl group, 4-biphenyl group, 1-chrysenyl group, 2-chrysenyl group, 3-chrysenyl group, 6-chrenyl group, 1-pyrenyl group, 2-pyrenyl group, 4- Pyrenyl group, 1-triphenyl group, 2-triphenyl group, 1-fluoranthenyl group, 2-fluoranthenyl group, - fluoranthenyl group, 7-fluoranthenyl group, 8-fluoranthenyl group, 1-perylenyl group, 2-perylenyl group, and a 3-perylenyl group.
Preferred are a substituted or unsubstituted phenyl group, 1-naphthyl group, 2-naphthyl group, 9-phenanthryl group, 2-phenanthryl group, and 2-fluorenyl group.

The aromatic hydrocarbon group of Ar ₁ to Ar ₆ preferably has 6 to 60 nuclear carbon atoms, and more preferably 6 to 30 nuclear carbon atoms.

Examples of the substituted or unsubstituted aromatic heterocyclic group represented by Ar ₁ to Ar ₆ include a substituted or unsubstituted pyrrolyl group, pyridinyl group, pyrazinyl group, indolyl group, furyl group, dibenzofuranyl group, dibenzothienyl group, A quinolyl group, a carbazolyl group, etc. are mentioned. Specifically, 1-pyrrolyl group, 2-pyrrolyl group, 3-pyrrolyl group, pyrazinyl group, 2-pyridinyl group, 3-pyridinyl group, 4-pyridinyl group, 1-indolyl group, 2-indolyl group, 3- Indolyl group, 4-indolyl group, 5-indolyl group, 6-indolyl group, 7-indolyl group, 1-isoindolyl group, 2-isoindolyl group, 3-isoindolyl group, 4-isoindolyl group, 5-isoindolyl group, 6- Isoindolyl group, 7-isoindolyl group, 2-furyl group, 3-furyl group, 1-benzofuranyl group, 2-benzofuranyl group, 3-benzofuranyl group, 4-benzofuranyl group, 5-benzofuranyl group, 6-benzofuranyl group, 7- Benzofuranyl group, 1-isobenzofuranyl group, 3-isobenzofuranyl group, 4-isobenzofuranyl group 5-isobenzofuranyl group, 6-isobenzofuranyl group, 7-isobenzofuranyl group, 1-dibenzofuranyl group, 2-dibenzofuranyl group, 3-dibenzofuranyl group, 4-dibenzofuranyl group Group, 1-benzothiophenyl group, 2-benzothiophenyl group, 3-benzothiophenyl group, 4-benzothiophenyl group, 5-benzothiophenyl group, 6-benzothiophenyl group, 7-benzothiophenyl group 1-dibenzothiophenyl group, 2-dibenzothiophenyl group, 3-dibenzothiophenyl group, 4-dibenzothiophenyl group, quinolyl group, 3-quinolyl group, 4-quinolyl group, 5-quinolyl group, 6-quinolyl Group, 7-quinolyl group, 8-quinolyl group, 1-isoquinolyl group, 3-isoquinolyl group, 4-isoquinolyl group, 5-isoquinolyl group, 6-iso Noryl group, 7-isoquinolyl group, 8-isoquinolyl group, 2-quinoxalinyl group, 5-quinoxalinyl group, 6-quinoxalinyl group, 1-carbazolyl group, 2-carbazolyl group, 3-carbazolyl group, 4-carbazolyl group, 9- Carbazolyl group, 1-phenanthridinyl group, 2-phenanthridinyl group, 3-phenanthridinyl group, 4-phenanthridinyl group, 6-phenanthridinyl group, 7-phenanthridinyl group 8-phenanthridinyl group, 9-phenanthridinyl group, 10-phenanthridinyl group, 1-acridinyl group, 2-acridinyl group, 3-acridinyl group, 4-acridinyl group, 9-acridinyl group, 1,7-phenanthrolin-2-yl group, 1,7-phenanthrolin-3-yl group, 1,7-phenanthrolin-4-yl group, 1,7-phenanthroline-5-yl group, 1,7-phenanthrolin-6-yl group, 1,7-phenanthrolin-8-yl group, 1,7-phenanthrolin-9-yl Group, 1,7-phenanthroline-10-yl group, 1,8-phenanthrolin-2-yl group, 1,8-phenanthrolin-3-yl group, 1,8-phenanthrolin-4 -Yl group, 1,8-phenanthroline-5-yl group, 1,8-phenanthrolin-6-yl group, 1,8-phenanthrolin-7-yl group, 1,8-phenanthroline -9-yl group, 1,8-phenanthrolin-10-yl group, 1,9-phenanthrolin-2-yl group, 1,9-phenanthrolin-3-yl group, 1,9-phen group Nanthrolin-4-yl group, 1,9-phenanthrolin-5-yl group, 1,9-phenane Lorin-6-yl group, 1,9-phenanthrolin-7-yl group, 1,9-phenanthrolin-8-yl group, 1,9-phenanthrolin-10-yl group, 1,10- Phenanthrolin-2-yl group, 1,10-phenanthrolin-3-yl group, 1,10-phenanthrolin-4-yl group, 1,10-phenanthrolin-5-yl group, 2, 9-phenanthrolin-1-yl group, 2,9-phenanthrolin-3-yl group, 2,9-phenanthrolin-4-yl group, 2,9-phenanthrolin-5-yl group, 2,9-phenanthrolin-6-yl group, 2,9-phenanthrolin-7-yl group, 2,9-phenanthrolin-8-yl group, 2,9-phenanthrolin-10-yl Group, 2,8-phenanthrolin-1-yl group, 2,8-phenanthroline 3-yl group, 2,8-phenanthrolin-4-yl group, 2,8-phenanthrolin-5-yl group, 2,8-phenanthrolin-6-yl group, 2,8-phenanth Lorin-7-yl group, 2,8-phenanthrolin-9-yl group, 2,8-phenanthrolin-10-yl group, 2,7-phenanthrolin-1-yl group, 2,7- Phenanthrolin-3-yl group, 2,7-phenanthrolin-4-yl group, 2,7-phenanthrolin-5-yl group, 2,7-phenanthrolin-6-yl group, 2, 7-phenanthrolin-8-yl group, 2,7-phenanthrolin-9-yl group, 2,7-phenanthrolin-10-yl group, 1-phenazinyl group, 2-phenazinyl group, 1-pheno Thiazinyl, 2-phenothiazinyl, 3-phenothiazinyl, 4-phenyl Enothiazinyl group, 10-phenothiazinyl group, 1-phenoxazinyl group, 2-phenoxazinyl group, 3-phenoxazinyl group, 4-phenoxazinyl group, 10-phenoxazinyl group, 2-oxazolyl group, 4-oxazolyl group, 5-oxazolyl group, 2 -Oxadiazolyl group, 5-oxadiazolyl group, 3-furazanyl group, 2-thienyl group, 3-thienyl group and the like.
Preferably, 1-dibenzofuranyl group, 2-dibenzofuranyl group, 3-dibenzofuranyl group, 4-dibenzofuranyl group, 1-carbazolyl group, 2-carbazolyl group, 3-carbazolyl group, 4-carbazolyl group , 9-carbazolyl group, 1-dibenzothiophenyl group, 2-dibenzothiophenyl group, 3-dibenzothiophenyl group, 4-dibenzothiophenyl group and the like.

The aromatic heterocyclic group represented by Ar ₁ to Ar ₆ preferably has 5 to 18 nuclear carbon atoms.

The aromatic hydrocarbon group and aromatic heterocyclic group of Ar ₁ to Ar ₆ may be substituted. Examples of the substituent include an alkyl group having 1 to 6 carbon atoms and an aromatic hydrocarbon group having 6 to 60 carbon atoms. And an aromatic heterocyclic group having 2 to 60 carbon atoms.

When Ar ₁ to Ar _{6 in the} formula (1) or (2) are a substituted aromatic hydrocarbon group or a substituted aromatic heterocyclic group, substitution of the aromatic hydrocarbon group and the aromatic heterocyclic group Specific examples of the group include alkyl groups (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, and particularly preferably 1 to 8 carbon atoms, such as methyl, ethyl, isopropyl, t-butyl, n -Octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.), an alkenyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 carbon atoms). -8, for example, vinyl, allyl, 2-butenyl, 3-pentenyl, etc.), alkynyl group (preferably having 2-20 carbon atoms, more preferably 2-12 carbon atoms). Particularly preferably, it has 2 to 8 carbon atoms, and examples thereof include propargyl, 3-pentynyl, etc.), an aryl group (preferably 6 to 60 carbon atoms, more preferably 6 to 30 carbon atoms, particularly preferably 6 carbon atoms). And, for example, phenyl, fluorenyl, naphthyl, anthryl, phenanthryl, chrysenyl, pyrenyl, triphenylenyl, fluoranthenyl, etc.), substituted or unsubstituted amino groups (preferably having 0 to 20 carbon atoms, more preferably Has 0 to 12 carbon atoms, particularly preferably 0 to 6 carbon atoms, and examples thereof include amino, methylamino, dimethylamino, diethylamino, diphenylamino, dibenzylamino, etc. An alkoxy group (preferably having 1 to 20 carbon atoms). More preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms. For example, methoxy, ethoxy, butoxy and the like), an aryloxy group (preferably having 6 to 20 carbon atoms, more preferably 6 to 16 carbon atoms, particularly preferably 6 to 12 carbon atoms such as phenyloxy, 2 -Naphthyloxy, etc.), acyl groups (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as acetyl, benzoyl, formyl, pivaloyl, etc. An alkoxycarbonyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, and examples thereof include methoxycarbonyl and ethoxycarbonyl). An aryloxycarbonyl group (preferably having 7 to 20 carbon atoms, more preferably having 7 to 16 carbon atoms, particularly preferably Alternatively, it has 7 to 10 carbon atoms, and examples thereof include phenyloxycarbonyl. ), An acyloxy group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as acetoxy, benzoyloxy, etc.), an acylamino group (preferably 2-20 carbon atoms, more preferably 2-16 carbon atoms, particularly preferably 2-10 carbon atoms, and examples thereof include acetylamino, benzoylamino, and the like, and alkoxycarbonylamino groups (preferably having 2-2 carbon atoms). 20, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as methoxycarbonylamino, etc.), an aryloxycarbonylamino group (preferably 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, particularly preferably 7 to 12 carbon atoms, such as phenyloxycarbonylamino A substituted or unsubstituted sulfonylamino group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methanesulfonylamino and benzenesulfonyl). A substituted or unsubstituted sulfamoyl group (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 16, particularly preferably a carbon number of 0 to 12, such as sulfamoyl, methylsulfayl). Moyl, dimethylsulfamoyl, phenylsulfamoyl, etc.), substituted or unsubstituted carbamoyl groups (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to carbon atoms). 12, such as carbamoyl, methylcarbamoyl, diethylcarbamoyl, phenylcarbamoyl, etc. An alkylthio group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methylthio, ethylthio, etc.), an arylthio group ( Preferably, it has 6 to 20 carbon atoms, more preferably 6 to 16 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenylthio, etc.), a substituted or unsubstituted sulfonyl group (preferably 1 carbon atom) To 20, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as mesyl, tosyl, etc.), substituted or unsubstituted sulfinyl groups (preferably having 1 to 20 carbon atoms, More preferably, it has 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, and examples thereof include methanesulfinyl and benzenesulfinyl. ), A substituted or unsubstituted ureido group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, and examples thereof include ureido, methylureido, phenylureido and the like. ), Substituted or unsubstituted phosphoramide groups (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as diethyl phosphate amide, phenyl phosphate Amide, etc.), hydroxy group, mercapto group, halogen atom (eg fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulfo group, carboxyl group, nitro group, hydroxamic acid group, sulfino group, A hydrazino group, an imino group, a heterocyclic group (preferably having 1 to 30 carbon atoms, more preferably 1 to 12 carbon atoms, For example, those containing a nitrogen atom, oxygen atom, sulfur atom, and specific examples include imidazolyl, pyridyl, quinolyl, furyl, thienyl, piperidyl, morpholino, benzoxazolyl, benzoimidazolyl, benzothiazolyl, carbazolyl and the like. ), A silyl group (preferably having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably 3 to 24 carbon atoms, and examples thereof include trimethylsilyl and triphenylsilyl). . These substituents may be further substituted. Moreover, when there are two or more substituents, they may be the same or different. If possible, they may be linked to each other to form a ring.

Examples of suitable substituent groups include methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, cyclohexyl, phenyl, 1-naphthyl, 2-naphthyl, trimethylsilyl, and triphenylsilyl.

Specific examples of Ar ₁ to Ar ₆ are shown below.

In the present invention, anthracene derivatives represented by the following formulas (3) to (6) are preferred.

Ar ₁ to Ar ₆ are the same groups as in the above formulas (1) and (2), and specific examples thereof are also the same.

Specific examples of the anthracene derivative of the present invention are shown below.

The anthracene derivative of the present invention can be obtained, for example, by the synthetic route shown below. Examples of synthesis are given in the examples.

(Wherein X ₁ , X ₂ and X ₃ are each a halogen or the like and may be the same or different, Ar ₁ to Ar ₃ are each a substituted or unsubstituted aromatic hydrocarbon group or a substituted group; Or an unsubstituted aromatic heterocyclic group, which may be the same or different.)

The anthracene derivative of the present invention can be used as a light emitting material for an organic EL device. Preferably it is used as a host material.
As the anthracene derivative of the present invention, a polymerized one can also be used. When the polymer is made, it is synthesized by a method usually used in polymer synthesis (polycondensation reaction, coupling reaction, radical reaction, living polymerization, etc.). Although there is no restriction | limiting in particular in a structure, It is preferable that it is molecular weight more than the polymerization degree which has a glass transition point.

The organic EL device of the present invention has an anode and a cathode, and one or more organic thin film layers including a light emitting layer sandwiched between the anode and the cathode, and at least one of the organic thin film layers of the present invention. Contains anthracene derivatives.

The layer containing the anthracene derivative of the present invention can further contain at least one of a phosphorescent dopant and a fluorescent dopant. By including such a dopant, it can function as a phosphorescent light emitting layer, a fluorescent light emitting layer, and a hybrid light emitting layer having both phosphorescence and fluorescence.
As the fluorescent dopant, at least one of an arylamine compound, a styrylamine compound, and a fluoranthene compound is preferable. As the phosphorescent dopant, a metal complex is preferable. For these specific examples, the description of the light emitting layer described later may be referred to.

As a typical configuration of the organic EL element of the present invention,
(1) Anode / light emitting layer / cathode (2) Anode / hole injection layer / light emitting layer / cathode (3) Anode / light emitting layer / electron injection layer / cathode (4) Anode / hole injection layer / light emitting layer / electron Injection layer / cathode (5) Anode / organic semiconductor layer / light emitting layer / cathode (6) Anode / organic semiconductor layer / electron barrier layer / light emitting layer / cathode (7) Anode / organic semiconductor layer / light emitting layer / adhesion improving layer / Cathode (8) Anode / hole injection layer / hole transport layer / light emitting layer / electron injection layer / cathode (9) Anode / insulating layer / light emitting layer / insulating layer / cathode (10) Anode / inorganic semiconductor layer / insulating layer / Light emitting layer / insulating layer / cathode (11) Anode / organic semiconductor layer / insulating layer / light emitting layer / insulating layer / cathode (12) Anode / insulating layer / hole injection layer / hole transport layer / light emitting layer / insulating layer / Cathode (13) Anode / insulating layer / hole injection layer / hole transport layer / light emitting layer / electron injection layer / cathode But, but it is not limited to these. Of these, the configuration of (8) is preferably used.

In the organic EL device of the present invention, the anthracene derivative of the present invention may be used in any of the organic layers described above, but is preferably contained in the light emitting band, and particularly preferably contained in the light emitting layer. The content is preferably 30 to 100 wt%.

Fig. 1 shows the configuration (8). The organic EL element includes a cathode 10 and an anode 20 and a hole injection layer 30, a hole transport layer 32, a light emitting layer 34, and an electron injection layer 36 sandwiched therebetween. The hole injection layer 30, the hole transport layer 32, the light emitting layer 34, and the electron injection layer 36 correspond to a plurality of organic thin film layers. At least one of the organic thin film layers 30, 32, 34, and 36 contains the anthracene derivative.

Hereinafter, each member of the organic EL element will be described.
The organic EL element is usually produced on a substrate, and the substrate supports the organic EL element. It is preferable to use a smooth substrate. When light is extracted through this substrate, it is desirable that the substrate is translucent and that the transmittance of light in the visible region with a wavelength of 400 to 700 nm is 50% or more.
As such a translucent board | substrate, a glass plate, a synthetic resin board, etc. are used suitably, for example. Examples of the glass plate include soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz. Examples of the synthetic resin plate include plates made of polycarbonate resin, acrylic resin, polyethylene terephthalate resin, polyether sulfide resin, polysulfone resin, and the like.

It is effective for the anode to inject holes into the hole injection layer, the hole transport layer, or the light emitting layer and to have a work function of 4.5 eV or more. Specific examples of the anode material include indium tin oxide (ITO), a mixture of indium oxide and zinc oxide (indium zinc oxide), a mixture of ITO and cerium oxide (ITCO), and a mixture of indium zinc oxide and cerium oxide (IZCO). ), A mixture of indium oxide and cerium oxide (ICO), a mixture of zinc oxide and aluminum oxide (AZO), tin oxide (NESA), gold, silver, platinum, copper and the like.
The anode can be formed from these electrode materials by vapor deposition or sputtering.
When light emitted from the light emitting layer is extracted from the anode, it is preferable that the transmittance of the anode for light emission is greater than 10%. The sheet resistance of the anode is preferably several hundred Ω / □ or less. Although the film thickness of the anode depends on the material, it is usually 10 nm to 1 μm, preferably 10 to 200 nm.

The light emitting layer has the following functions.
(I) injection function; function capable of injecting holes from the anode or hole injection layer when an electric field is applied, and electron injection from the cathode or electron injection layer (ii) transport function; injected charge (electrons (Iii) light emission function; function to recombine electrons and holes and connect them to light emission

As a method for forming the light emitting layer, for example, a known method such as an evaporation method, a spin coating method, or an LB method can be applied. The light emitting layer is particularly preferably a molecular deposited film. The molecular deposited film is a film formed by depositing a material compound in a gas phase state or a film formed by solidifying a material compound in a solution state or a liquid phase state. Usually, this molecular deposited film is an LB. The thin film (molecular accumulation film) formed by the method can be classified by the difference in aggregated structure and higher order structure, and the functional difference resulting therefrom.
The light emitting layer can also be formed by dissolving a binder such as a resin and a material compound in a solvent to form a solution, and then thinning the solution by a spin coating method or the like.

Examples of the light emitting material or dopant material that can be used for the light emitting layer include anthracene, naphthalene, phenanthrene, pyrene, tetracene, coronene, chrysene, fluorescein, perylene, phthaloperylene, naphthaloperylene, perinone, phthaloperinone, naphthaloperinone, diphenylbutadiene, tetraphenylbutadiene, Coumarin, oxadiazole, aldazine, bisbenzoxazoline, bisstyryl, pyrazine, cyclopentadiene, quinoline metal complex, aminoquinoline metal complex, benzoquinoline metal complex, imine, diphenylethylene, vinylanthracene, diaminocarbazole, pyran, thiopyran, polymethine , Merocyanine, imidazole chelating oxinoid compounds, quinacridone, rubrene and their derivatives And a fluorescent dye and the like, but not limited thereto.

In addition to the anthracene derivatives of the present invention, specific examples of host materials that can be used in the light emitting layer include compounds represented by the following (i) to (ix), and these may be used alone or in combination. Also good.
Asymmetric anthracene represented by the following formula (i).

(In the formula, Ar ⁰⁰¹ is a substituted or unsubstituted condensed aromatic hydrocarbon group having 10 to 50 nuclear carbon atoms. Ar ⁰⁰² is a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms. X ⁰⁰¹ to X ⁰⁰³ are each independently a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms, substituted or unsubstituted A substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, a substituted or unsubstituted nuclear atom number of 5 to 50 Aryloxy group, substituted or unsubstituted arylthio group having 5 to 50 nucleus atoms, substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, carboxyl group, halogen atom, cyano , A nitro group and a hydroxy group, a, b and c are each an integer of 0 to 4. n is an integer of 1 to 3. When n is 2 or more, [] Same or different.)

An asymmetric monoanthracene derivative represented by the following formula (ii).

(In the formula, Ar ⁰⁰³ and Ar ⁰⁰⁴ are each independently a substituted or unsubstituted aromatic ring group having 6 to 50 nuclear carbon atoms, and m and n are each an integer of 1 to 4, provided that When m = n = 1 and the bonding position of Ar ⁰⁰³ and Ar ^{004 to} the benzene ring is symmetrical, Ar ⁰⁰³ and Ar ⁰⁰⁴ are not the same, and m or n is an integer of 2 to 4 M and n are different integers.
R ⁰⁰¹ to R ⁰¹⁰ are each independently a hydrogen atom, a substituted or unsubstituted aromatic ring group having 6 to 50 nuclear carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms, substituted Or an unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, Substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted arylthio group having 5 to 50 nucleus atoms, substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, substituted or unsubstituted A silyl group, a carboxyl group, a halogen atom, a cyano group, a nitro group, and a hydroxy group. )

An asymmetric pyrene derivative represented by the following formula (iii).

[ ^Wherein Ar ⁰⁰⁵ and Ar ⁰⁰⁶ are each a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms. L ⁰⁰¹ and L ⁰⁰² are a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthalenylene group, a substituted or unsubstituted fluorenylene group, or a substituted or unsubstituted dibenzosilolylene group, respectively.
m is an integer from 0 to 2, n is an integer from 1 to 4, s is an integer from 0 to 2, and t is an integer from 0 to 4.
L ⁰⁰¹ or Ar ⁰⁰⁵ binds to any of the 1-5 positions of pyrene, and L ⁰⁰² or Ar ⁰⁰⁶ binds to any of the 6-10 positions of pyrene. However, when n + t is an even number, Ar ⁰⁰⁵ , Ar ⁰⁰⁶ , L ⁰⁰¹ , and L ⁰⁰² satisfy the following (1) or (2).
(1) Ar ⁰⁰⁵ ≠ Ar ⁰⁰⁶ and / or L ⁰⁰¹ ≠ L ⁰⁰² (where ≠ indicates a group having a different structure)
(2) When Ar ⁰⁰⁵ = Ar ⁰⁰⁶ and L ⁰⁰¹ = L ⁰⁰² (2-1) m ≠ s and / or n ≠ t, or (2-2) When m = s and n = t,
(2-2-1) L ⁰⁰¹ and L ⁰⁰² or pyrene are bonded to different bonding positions on Ar ⁰⁰⁵ and Ar ⁰⁰⁶ , respectively (2-2-2) L ⁰⁰¹ and L ⁰⁰² , or pyrene is , Ar ⁰⁰⁵ and Ar ⁰⁰⁶ are bonded at the same bonding position, and L ⁰⁰¹ and L ⁰⁰² or Ar ⁰⁰⁵ and Ar ⁰⁰⁶ are substituted at positions 1 and 6 or 2 and 7 in pyrene There is no. ]

An asymmetric anthracene derivative represented by the following formula (iv):

(In the formula, A ⁰⁰¹ and A ⁰⁰² are each independently a substituted or unsubstituted condensed aromatic ring group having 10 to 20 nuclear carbon atoms.
Ar ⁰⁰⁷ and Ar ⁰⁰⁸ are each independently a hydrogen atom or a substituted or unsubstituted aromatic ring group having 6 to 50 nuclear carbon atoms.
R ⁰¹¹ to R ⁰²⁰ are each independently a hydrogen atom, a substituted or unsubstituted aromatic ring group having 6 to 50 nuclear carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms, a substituted group Or an unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, Substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted arylthio group having 5 to 50 nucleus atoms, substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, substituted or unsubstituted A silyl group, a carboxyl group, a halogen atom, a cyano group, a nitro group or a hydroxy group.
Ar ⁰⁰⁷ , Ar ⁰⁰⁸ , R ⁰¹⁹ and R ⁰²⁰ may each be plural, and adjacent ones may form a saturated or unsaturated cyclic structure.
However, in the formula (iv), a group that is symmetrical with respect to the XY axis shown on the anthracene is not bonded to the 9th and 10th positions of the central anthracene. )

An anthracene derivative represented by the following formula (v).

(Wherein R ⁰²¹ to R ⁰³⁰ are each independently a hydrogen atom, alkyl group, cycloalkyl group, optionally substituted aryl group, alkoxyl group, aryloxy group, alkylamino group, alkenyl group, arylamino group, or substituted. A and b each represent an integer of 1 to 5, and when they are 2 or more, R ^021s or R ^022s may be the same or different from each other In addition, R ⁰²¹ or R ⁰²² may be bonded to each other to form a ring, or R ⁰²³ and R ⁰²⁴ , R ⁰²⁵ and R ⁰²⁶ , R ⁰²⁷ and R ⁰²⁸ , R ⁰²⁹ and R ⁰³⁰ are L ⁰⁰³ may be a single bond, —O—, —S—, —N (R) — (R is an alkyl group or an optionally substituted aryl group). Represents an alkylene group or an arylene group.)

An anthracene derivative represented by the following formula (vi).

(Wherein R ⁰³¹ to R ⁰⁴⁰ each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an alkoxyl group, an aryloxy group, an alkylamino group, an arylamino group, or an optionally substituted multicyclic group) C, d, e and f each represent an integer of 1 to 5, and when they are 2 or more, R ^031s , R ^032s , R ^036s or R ^037s may be the same. R ⁰³¹ may be different from each other, R ⁰³² may be bonded to each other, R ⁰³³ may be bonded to each other, or R ⁰³⁷ may be bonded to each other to form a ring, and R ⁰³³ and R ⁰³⁴ , R ⁰³⁹ and R ⁰⁴⁰ are based on each other. bonded to ring the optionally formed .L ⁰⁰⁴ is a single bond, -O -, - S -, - N (R) - (R is an aryl group which may be alkyl or substituted), Al Shows the alkylene group or an arylene group.)

Spirofluorene derivatives represented by the following formula (vii).

( ^Wherein A ⁰⁰⁵ to A ⁰⁰⁸ are each independently a substituted or unsubstituted biphenylyl group or a substituted or unsubstituted naphthyl group.)

A condensed ring-containing compound represented by the following formula (viii):

( ^Wherein A ⁰¹¹ to A ⁰¹³ are each independently a substituted or unsubstituted arylene group having 6 to 50 nuclear carbon atoms. A ⁰¹⁴ to A ⁰¹⁶ are each independently a hydrogen atom, or a substituted or unsubstituted group. A substituted aryl group having 6 to 50 carbon atoms, R ⁰⁴¹ to R ⁰⁴³ each independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or 1 carbon atom; Alkoxy group having 6 to 6 carbon atoms, aryloxy group having 5 to 18 carbon atoms, aralkyloxy group having 7 to 18 carbon atoms, arylamino group having 5 to 16 carbon atoms, nitro group, cyano group, ester group having 1 to 6 carbon atoms Or a halogen atom, and at least one of A ⁰¹¹ to A ⁰¹⁶ is a group having three or more condensed aromatic rings.

A fluorene compound represented by the following formula (ix).

Wherein R ⁰⁵¹ and R ⁰⁵² are a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aromatic heterocyclic group, a substituted amino group, ^{R 051} together to bind to. different fluorene group represents a cyano group or a halogen ^{atom, R 052} each other, or different, even the same, ^{R 051} and ^{R 052} bonding to the same fluorene group, R ⁰⁵³ and R ⁰⁵⁴ may be a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted group. R ⁰⁵³ and R ⁰⁵⁴ representing an aromatic heterocyclic group and bonded to different fluorene groups are the same or different. R ⁰⁵³ and R ⁰⁵⁴ bonded to the same fluorene group may be the same or different, and Ar ⁰¹¹ and Ar ⁰¹² may be a substituted or unsubstituted condensed group having a total of 3 or more benzene rings. A polycyclic aromatic hydrocarbon group or a condensed polycyclic aromatic heterocyclic group in which a total of three or more substituted or unsubstituted carbons of a benzene ring and a heterocyclic ring is bonded to a fluorene group, Ar ⁰¹¹ and Ar ⁰¹² are (It may be the same or different. N represents an integer of 1 to 10.)

In the organic EL device of the present invention, the light emitting layer may contain a phosphorescent dopant and / or a fluorescent dopant in addition to the light emitting material of the present invention, if desired. In addition, a light emitting layer containing these dopants may be stacked on the light emitting layer containing the anthracene derivative of the present invention.

A phosphorescent dopant is a compound that can emit light from triplet excitons. Although it is not particularly limited as long as it emits light from triplet excitons, it is preferably a metal complex containing at least one metal selected from the group consisting of Ir, Ru, Pd, Pt, Os and Re, and is preferably a porphyrin metal complex or ortho Metalated metal complexes are preferred. The phosphorescent compounds may be used alone or in combination of two or more.

The porphyrin metal complex is preferably a porphyrin platinum complex.
There are various ligands that form orthometalated metal complexes. Preferred ligands include compounds having a phenylpyridine skeleton, bipyridyl skeleton or phenanthroline skeleton, or 2-phenylpyridine derivatives, 7,8. -Benzoquinoline derivatives, 2- (2-thienyl) pyridine derivatives, 2- (1-naphthyl) pyridine derivatives, 2-phenylquinoline derivatives and the like. These ligands may have a substituent as needed. In particular, a fluorinated compound or a compound having a trifluoromethyl group introduced is preferable as a blue dopant. Furthermore, you may have ligands other than the said ligands, such as an acetylacetonate and picric acid, as an auxiliary ligand.

Specific examples of such metal complexes include tris (2-phenylpyridine) iridium, tris (2-phenylpyridine) ruthenium, tris (2-phenylpyridine) palladium, bis (2-phenylpyridine) platinum, tris (2- Phenylpyridine) osmium, tris (2-phenylpyridine) rhenium, octaethylplatinum porphyrin, octaphenylplatinum porphyrin, octaethylpalladium porphyrin, octaphenylpalladium porphyrin, etc. An appropriate complex is selected depending on the device performance and the host compound to be used.

There is no restriction | limiting in particular as content in the light emitting layer of a phosphorescent dopant, Although it can select suitably according to the objective, For example, it is 0.1-70 mass%, and 1-30 mass% is preferable. If the content of the phosphorescent compound is less than 0.1% by mass, the light emission is weak and the effect of the content may not be sufficiently exhibited. If the content exceeds 70% by mass, a phenomenon called concentration quenching becomes prominent. The device performance may be degraded.

Fluorescent dopants are required from amine compounds, aromatic compounds, chelate complexes such as tris (8-quinolinolato) aluminum complex, coumarin derivatives, tetraphenylbutadiene derivatives, bisstyrylarylene derivatives, oxadiazole derivatives, etc. It is preferable to select a compound according to the emission color, and a styrylamine compound, a styryldiamine compound, an arylamine compound, and an aryldiamine compound are more preferable. Moreover, the condensed polycyclic aromatic compound which is not an amine compound is also preferable. These fluorescent dopants may be used alone or in combination.

As the styrylamine compound and styryldiamine compound, those represented by the following formula (A) are preferable.

(In the formula, Ar ¹⁰¹ is a p-valent group, and a corresponding p-valent group of a phenyl group, a naphthyl group, a biphenyl group, a terphenyl group, a stilbenyl group, or a distyrylaryl group, and Ar ¹⁰² and Ar ¹⁰³ are Each of them is an aromatic hydrocarbon group having 6 to 20 carbon atoms, and Ar ¹⁰¹ , Ar ¹⁰² and Ar ¹⁰³ may be substituted, and any one of Ar ¹⁰¹ to Ar ¹⁰³ is substituted with a styryl group. More preferably, at least one of Ar ¹⁰² or Ar ¹⁰³ is substituted with a styryl group, and p is an integer of 1 to 4, and preferably an integer of 1 to 2.
Here, examples of the aromatic hydrocarbon group having 6 to 20 carbon atoms include a phenyl group, a naphthyl group, an anthranyl group, a phenanthryl group, and a terphenyl group.

As the arylamine compound and the aryldiamine compound, those represented by the following formula (B) are preferable.

(In the formula, Ar ¹¹¹ is a q-valent substituted or unsubstituted aromatic hydrocarbon group having 5 to 40 nuclear carbon atoms, and Ar ¹¹² and Ar ¹¹³ are each substituted or unsubstituted aryl having 5 to 40 nuclear carbon atoms. Q is an integer of 1 to 4, preferably an integer of 1 to 2.)
Here, examples of the aryl group having 5 to 40 nuclear carbon atoms include phenyl, naphthyl, anthranyl, phenanthryl, pyrenyl, coronyl, biphenyl, terphenyl, pyrrolyl, furyl, thienyl. Group, benzothienyl group, oxadiazolyl group, diphenylanthranyl group, indolyl group, carbazolyl group, pyridyl group, benzoquinolyl group, fluoranthenyl group, acenaphthofluoranthenyl group, stilbene group, perylenyl group, chrysenyl group, picenyl group, triphenylenyl Group, rubicenyl group, benzoanthracenyl group, phenylanthranyl group, bisanthracenyl group and the like, and naphthyl group, anthranyl group, chrycenyl group and pyrenyl group are preferable.

Preferred substituents for substitution on the aryl group are alkyl groups having 1 to 6 carbon atoms (ethyl group, methyl group, i-propyl group, n-propyl group, s-butyl group, t-butyl group, pentyl group). Group, hexyl group, cyclopentyl group, cyclohexyl group, etc.), alkoxy group having 1 to 6 carbon atoms (ethoxy group, methoxy group, i-propoxy group, n-propoxy group, s-butoxy group, t-butoxy group, pentoxy group) Hexyloxy group, cyclopentoxy group, cyclohexyloxy group, etc.), aryl group having 5 to 40 nuclear carbon atoms, amino group substituted with aryl group having 5 to 40 nuclear carbon atoms, aryl having 5 to 40 nuclear carbon atoms And an ester group having a group, an ester group having an alkyl group having 1 to 6 carbon atoms, a cyano group, a nitro group, and a halogen atom.

The light emitting layer may contain a hole transport material, an electron transport material, and a polymer binder as necessary.
The thickness of the light emitting layer is preferably 5 to 50 nm, more preferably 7 to 50 nm, and most preferably 10 to 50 nm. If the thickness is less than 5 nm, it is difficult to form a light emitting layer and the adjustment of chromaticity may be difficult, and if it exceeds 50 nm, the driving voltage may increase.

The hole injection layer and the hole transport layer help to inject holes into the light emitting layer and transport to the light emitting region, and have a high hole mobility and a small ionization energy of usually 5.5 eV or less. As a material for such a hole injection layer and a hole transport layer, a material that transports holes to the light emitting layer with lower electric field strength is preferable, and the hole mobility is, for example, 10 ⁴ to 10 ⁶ V / cm. When applying the electric field of 10 ⁻⁴ cm ² / V · sec or more, it is preferable.
The material for the hole injection layer and the hole transport layer is not particularly limited, and is conventionally used as a charge transport material for holes in optical transmission materials, and the hole injection layer and holes for organic EL devices. An arbitrary thing can be selected and used from the well-known things used for the transport layer.

For the hole injection layer and the hole transport layer, for example, an aromatic amine derivative represented by the following formula can be used.

Ar ²¹¹ to Ar ²¹³ , Ar ²²¹ to Ar ^223, and Ar ²⁰³ to Ar ²⁰⁸ are each a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms, or a substituted or unsubstituted number of 5 to 50 nuclear atoms. An aromatic heterocyclic group. a to c and p to r are integers of 0 to 3, respectively. Ar ²⁰³ and Ar ²⁰⁴ , Ar ²⁰⁵ and Ar ²⁰⁶ , Ar ²⁰⁷ and Ar ²⁰⁸ may be connected to each other to form a saturated or unsaturated ring.

Specific examples of the substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms include phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, and 9-anthryl group. 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 9-phenanthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthacenyl group, 1-pyrenyl group, 2-pyrenyl group 4-pyrenyl group, 2-biphenylyl group, 3-biphenylyl group, 4-biphenylyl group, p-terphenyl-4-yl group, p-terphenyl-3-yl group, p-terphenyl-2 -Yl group, m-terphenyl-4-yl group, m-terphenyl-3-yl group, m-terphenyl-2-yl group, o-tolyl group, m-tolyl group, p Tolyl group, pt-butylphenyl group, p- (2-phenylpropyl) phenyl group, 3-methyl-2-naphthyl group, 4-methyl-1-naphthyl group, 4-methyl-1-anthryl group, 4 Examples include a '-methylbiphenylyl group, 4 ″ -t-butyl-p-terphenyl-4-yl group.

Specific examples of the substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nucleus atoms include 1-pyrrolyl group, 2-pyrrolyl group, 3-pyrrolyl group, pyrazinyl group, 2-pyridinyl group, and 3-pyridinyl group. 4-pyridinyl group, 1-indolyl group, 2-indolyl group, 3-indolyl group, 4-indolyl group, 5-indolyl group, 6-indolyl group, 7-indolyl group, 1-isoindolyl group, 2-isoindolyl group 3-isoindolyl group, 4-isoindolyl group, 5-isoindolyl group, 6-isoindolyl group, 7-isoindolyl group, 2-furyl group, 3-furyl group, 2-benzofuryl group, 3-benzofuryl group, 4-benzofuryl group 5-benzofuryl group, 6-benzofuryl group, 7-benzofuryl group, 1-isobenzofuryl group, 3-isobenzofuryl group, 4 Isobenzofuryl group, 5-isobenzofuryl group, 6-isobenzofuryl group, 7-isobenzofuryl group, quinolyl group, 3-quinolyl group, 4-quinolyl group, 5-quinolyl group, 6-quinolyl group, 7 -Quinolyl group, 8-quinolyl group, 1-isoquinolyl group, 3-isoquinolyl group, 4-isoquinolyl group, 5-isoquinolyl group, 6-isoquinolyl group, 7-isoquinolyl group, 8-isoquinolyl group, 2-quinoxalinyl group, 5 -Quinoxalinyl group, 6-quinoxalinyl group, 1-carbazolyl group, 2-carbazolyl group, 3-carbazolyl group, 4-carbazolyl group, 9-carbazolyl group, 1-phenanthridinyl group, 2-phenanthridinyl group, 3-phenanthridinyl group, 4-phenanthridinyl group, 6-phenanthridinyl group, 7-phenanthridinyl group, 8 Phenanthridinyl group, 9-phenanthridinyl group, 10-phenanthridinyl group, 1-acridinyl group, 2-acridinyl group, 3-acridinyl group, 4-acridinyl group, 9-acridinyl group, 1,7 -Phenanthrolin-2-yl group, 1,7-phenanthroline-3-yl group, 1,7-phenanthroline-4-yl group, 1,7-phenanthroline-5-yl group, 1,7-phenanthroline-6-yl group 1,7-phenanthroline-8-yl group, 1,7-phenanthroline-9-yl group, 1,7-phenanthroline-10-yl group, 1,8-phenanthroline-2-yl group, 1,8- Phenanthroline-3-yl group, 1,8-phenanthroline-4-yl group, 1,8-phenanthroline-5-yl group, 1,8-phenanthroline-6-y Group, 1,8-phenanthroline-7-yl group, 1,8-phenanthroline-9-yl group, 1,8-phenanthroline-10-yl group, 1,9-phenanthroline-2-yl group, 1,9 -Phenanthroline-3-yl group, 1,9-phenanthroline-4-yl group, 1,9-phenanthroline-5-yl group, 1,9-phenanthroline-6-yl group, 1,9-phenanthroline-7-yl group Group, 1,9-phenanthroline-8-yl group, 1,9-phenanthroline-10-yl group, 1,10-phenanthroline-2-yl group, 1,10-phenanthroline-3-yl group, 1,10- Phenanthroline-4-yl group, 1,10-phenanthroline-5-yl group, 2,9-phenanthroline-1-yl group, 2,9-phenanthroline-3-yl group, 2 9-phenanthroline-4-yl group, 2,9-phenanthroline-5-yl group, 2,9-phenanthroline-6-yl group, 2,9-phenanthroline-7-yl group, 2,9-phenanthroline-8- Yl group, 2,9-phenanthroline-10-yl group, 2,8-phenanthroline-1-yl group, 2,8-phenanthroline-3-yl group, 2,8-phenanthroline-4-yl group, 2,8 -Phenanthroline-5-yl group, 2,8-phenanthroline-6-yl group, 2,8-phenanthroline-7-yl group, 2,8-phenanthroline-9-yl group, 2,8-phenanthroline-10-yl Group, 2,7-phenanthroline-1-yl group, 2,7-phenanthroline-3-yl group, 2,7-phenanthroline-4-yl group, 2,7-phenant Rin-5-yl group, 2,7-phenanthroline-6-yl group, 2,7-phenanthroline-8-yl group, 2,7-phenanthroline-9-yl group, 2,7-phenanthroline-10-yl group 1-phenazinyl group, 2-phenazinyl group, 1-phenothiazinyl group, 2-phenothiazinyl group, 3-phenothiazinyl group, 4-phenothiazinyl group, 10-phenothiazinyl group, 1-phenoxazinyl group, 2-phenoxazinyl group 3-phenoxazinyl group, 4-phenoxazinyl group, 10-phenoxazinyl group, 2-oxazolyl group, 4-oxazolyl group, 5-oxazolyl group, 2-oxadiazolyl group, 5-oxadiazolyl group, 3-furazanyl group, 2-thienyl group 3-thienyl group, 2-methylpyrrol-1-yl group, 2-methylpyrrole- 3-yl group, 2-methylpyrrol-4-yl group, 2-methylpyrrol-5-yl group, 3-methylpyrrol-1-yl group, 3-methylpyrrol-2-yl group, 3-methylpyrrole- 4-yl group, 3-methylpyrrol-5-yl group, 2-t-butylpyrrol-4-yl group, 3- (2-phenylpropyl) pyrrol-1-yl group, 2-methyl-1-indolyl group 4-methyl-1-indolyl group, 2-methyl-3-indolyl group, 4-methyl-3-indolyl group, 2-t-butyl 1-indolyl group, 4-t-butyl 1-indolyl group, 2- Examples thereof include t-butyl 3-indolyl group and 4-t-butyl 3-indolyl group.

Furthermore, a compound represented by the following formula can be used for the hole injection layer and the hole transport layer.

Ar ²³¹ to Ar ²³⁴ are each a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms. L is a linking group, which is a single bond, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms. x is an integer of 0 to 5. Ar ²³² and Ar ²³³ may ^combine with each other to form a saturated or unsaturated ring. Specific examples of the substituted or unsubstituted aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms and the substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms are the same as those described above. can give.

Furthermore, specific examples of the material for the hole injection layer and the hole transport layer include, for example, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives. And amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aniline copolymers, and conductive polymer oligomers (particularly thiophene oligomers).

The above materials can be used for the hole injection layer and the hole transport layer, but porphyrin compounds, aromatic tertiary amine compounds, and styrylamine compounds, particularly aromatic tertiary amine compounds should be used. Is preferred.

Further, compounds having two condensed aromatic rings in the molecule, such as 4,4′-bis (N- (1-naphthyl) -N-phenylamino) biphenyl (hereinafter abbreviated as NPD), triphenylamine unit It is preferable to use 4,4 ′, 4 ″ -tris (N- (3-methylphenyl) -N-phenylamino) triphenylamine (hereinafter abbreviated as MTDATA) or the like in which three are connected in a starburst type. .

In addition, a nitrogen-containing heterocyclic derivative represented by the following formula can also be used.

In the formula, R ²⁰¹ to R ²⁰⁶ each represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aromatic heterocyclic group. R ²⁰¹ and R ²⁰² , R ²⁰³ and R ²⁰⁴ , R ²⁰⁵ and R ²⁰⁶ , R ²⁰¹ and R ²⁰⁶ , R ²⁰² and R ²⁰³ , or R ²⁰⁴ and R ²⁰⁵ may form a condensed ring.

Furthermore, the compound of a following formula can also be used.

R ²¹¹ to R ²¹⁶ are substituents, each preferably an electron-withdrawing group such as a cyano group, a nitro group, a sulfonyl group, a carbonyl group, a trifluoromethyl group, or a halogen.

In addition, inorganic compounds such as p-type Si and p-type SiC can also be used as materials for the hole injection layer and the hole transport layer.
The hole injection layer and the hole transport layer can be formed by thinning the above-described compound by a known method such as a vacuum deposition method, a spin coating method, a casting method, or an LB method. The thickness of the hole injection layer and the hole transport layer is not particularly limited, but is usually 5 nm to 5 μm. The hole injection layer and the hole transport layer may be composed of one or more layers made of the above-mentioned materials, or a plurality of hole injection layers and hole transport layers made of different compounds are laminated. There may be.

The organic semiconductor layer is a layer that assists hole injection or electron injection into the light emitting layer, and preferably has a conductivity of 10 ⁻¹⁰ S / cm or more. As a material for such an organic semiconductor layer, a conductive oligomer such as a thiophene-containing oligomer or an arylamine oligomer, a conductive dendrimer such as an arylamine dendrimer, or the like can be used.

The electron injection layer and the electron transport layer are layers that assist injection of electrons into the light emitting layer and transport them to the light emitting region, and have a high electron mobility. The adhesion improving layer is a kind of an electron injecting layer made of a material that particularly adheres well to the cathode.
The electron transport layer is appropriately selected with a film thickness of 5 nm to 5 μm. In particular, when the film thickness is large, the electron mobility is 10 ⁻⁵ cm when an electric field of 10 ⁴ to 10 ⁶ V / cm is applied in order to avoid an increase in voltage. It is preferable that it is ² / Vs or more.

As a material used for the electron injection layer and the electron transport layer, 8-hydroxyquinoline or a metal complex of its derivative or an oxadiazole derivative is preferable. Specific examples of metal complexes of 8-hydroxyquinoline or its derivatives include metal chelate oxinoid compounds containing a chelate of oxine (generally 8-quinolinol or 8-hydroxyquinoline), such as tris (8-quinolinolato) aluminum. it can.

Examples of the oxadiazole derivative include an electron transfer compound represented by the following formula.

(In the formula, Ar ³⁰¹ , Ar ³⁰² , Ar ³⁰³ , Ar ³⁰⁵ , Ar ³⁰⁶ , and Ar ³⁰⁹ each represent a substituted or unsubstituted aryl group. Ar ³⁰⁴ , Ar ³⁰⁷ , and Ar ³⁰⁸ are each substituted or unsubstituted. Represents an arylene group.)

Here, examples of the aryl group include a phenyl group, a biphenyl group, an anthranyl group, a perylenyl group, and a pyrenyl group. Examples of the arylene group include a phenylene group, a naphthylene group, a biphenylene group, an anthranylene group, a peryleneylene group, and a pyrenylene group. Examples of the substituent include an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and a cyano group. This electron transfer compound is preferably a thin film-forming compound.

Specific examples of the electron transfer compound include the following.

(Me represents a methyl group, and tBu represents a tbutyl group.)

Furthermore, materials represented by the following formulas (E) to (J) can also be used as materials used for the electron injection layer and the electron transport layer.

(In the formulas (E) and (F), A ³¹¹ to A ³¹³ each represent a nitrogen atom or a carbon atom.
Ar ³¹¹ is a substituted or unsubstituted aryl group having 6 to 60 nuclear carbon atoms or a substituted or unsubstituted heteroaryl group having 3 to 60 nuclear atoms, and Ar ^{311 ′} is a substituted or unsubstituted nuclear carbon An arylene group of 6 to 60 or a substituted or unsubstituted heteroarylene group of 3 to 60 nuclear atoms, and Ar ³¹² represents a hydrogen atom, a substituted or unsubstituted aryl group of 6 to 60 nuclear carbon atoms, a substituted or unsubstituted An unsubstituted heteroaryl group having 3 to 60 nucleus atoms, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms. However, any one of Ar ³¹¹ and Ar ³¹² is a substituted or unsubstituted condensed ring group having 10 to 60 nuclear carbon atoms, or a substituted or unsubstituted monoheterocondensed ring group having 3 to 60 nucleus atoms.
L ³¹¹ , L ³¹² and L ³¹³ are each a single bond, a substituted or unsubstituted arylene group having 6 to 60 nuclear carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 60 nuclear atoms, or a substituted or unsubstituted group. Substituted fluorenylene group.
R and R ³¹¹ are each a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 60 nuclear carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 60 nuclear atoms, a substituted or unsubstituted carbon atom having 1 to 20 alkyl groups, or substituted or unsubstituted alkoxy groups having 1 to 20 carbon atoms, n is an integer of 0 to 5, and when n is 2 or more, a plurality of Rs may be the same or different. In addition, adjacent R groups may be bonded to each other to form a carbocyclic aliphatic ring or a carbocyclic aromatic ring. The nitrogen-containing heterocyclic derivative represented by this.

HAr-L ³¹⁴ -Ar ³²¹ -Ar ³²² (G)
(In the formula, HAr is a nitrogen-containing heterocyclic ring having 3 to 40 carbon atoms which may have a substituent, and L ³¹⁴ has a carbon number of 6 to 60 optionally having a single bond or a substituent. An arylene group, a heteroarylene group having 3 to 60 atoms which may have a substituent, or a fluorenylene group which may have a substituent, and Ar ³²¹ may have a substituent A divalent aromatic hydrocarbon group having 6 to 60 carbon atoms, and Ar ³²² is an aryl group having 6 to 60 carbon atoms which may have a substituent or an atomic number which may have a substituent A nitrogen-containing heterocyclic derivative represented by 3 to 60 heteroaryl groups).

^Wherein X ³⁰¹ and Y ³⁰¹ are each a saturated or unsaturated hydrocarbon group having 1 to 6 carbon atoms, an alkoxy group, an alkenyloxy group, an alkynyloxy group, a hydroxy group, a substituted or unsubstituted aryl group, a substituted group Or an unsubstituted heterocycle or a structure in which X and Y are combined to form a saturated or unsaturated ring, and R ³⁰¹ to R ³⁰⁴ are each a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryloxy group Perfluoroalkyl group, perfluoroalkoxy group, amino group, alkylcarbonyl group, arylcarbonyl group, alkoxycarbonyl group, aryloxycarbonyl group, azo group, alkylcarbonyloxy group, arylcarbonyloxy group, alkoxycarbonyloxy group, aryl Oxycarbonyloxy group, sulfi Group, sulfonyl group, sulfanyl group, silyl group, carbamoyl group, aryl group, heterocyclic group, alkenyl group, alkynyl group, nitro group, formyl group, nitroso group, formyloxy group, isocyano group, cyanate group, isocyanate group, A thiocyanate group, an isothiocyanate group, or a cyano group, which may be substituted, or adjacent groups may form a substituted or unsubstituted condensed ring. Pentadiene derivative.

(Wherein R ³²¹ to R ³²⁸ and Z ³²² are each a hydrogen atom, a saturated or unsaturated hydrocarbon group, an aromatic hydrocarbon group, a heterocyclic group, a substituted amino group, a substituted boryl group, an alkoxy group or an aryl group. X ³⁰² , Y ³⁰² and Z ³²¹ each represents a saturated or unsaturated hydrocarbon group, aromatic hydrocarbon group, heterocyclic group, substituted amino group, alkoxy group or aryloxy group; ³²¹ and Z ³²² may be bonded to each other to form a condensed ring. N represents an integer of 1 to 3, and when n or (3-n) is 2 or more, R ³²¹ to R ³²⁸ , X ³⁰² , Y ³⁰² , Z ³²² and Z ³²¹ may be the same or different, provided that n is 1, X ³⁰² , Y ³⁰² and R ³²² are methyl groups and R ³²⁸ is a hydrogen atom or a substituted boryl group. And a compound in which n is 3 and Z ³²¹ is a methyl group).

[ ^Wherein Q ³⁰¹ and Q ³⁰² each represent a ligand represented by the following formula (K), and L ³¹⁵ represents a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group , Substituted or unsubstituted aryl group, substituted or unsubstituted aromatic heterocyclic group, —OR (where R is a hydrogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group, substituted or unsubstituted An aryl group, a substituted or unsubstituted aromatic heterocyclic group) or —O—Ga—Q ³⁰³ (Q ³⁰⁴ ) (Q ³⁰³ and Q ³⁰⁴ are the same as Q ³⁰¹ and Q ³⁰² ). Represents a quantifier. ] The gallium complex represented by this.

[Wherein, ring A ³⁰¹ and A ³⁰² are each a 6-membered aryl ring structure condensed with each other, which may have a substituent. ]

This metal complex has strong properties as an n-type semiconductor and has a large electron injection capability. Furthermore, since the generation energy at the time of complex formation is also low, the bondability between the metal and the ligand of the formed metal complex is strengthened, and the fluorescence quantum efficiency as a light emitting material is large.
Specific examples of the substituents of the rings A ³⁰¹ and A ³⁰² that form the ligand of the formula (K) include chlorine, bromine, iodine, halogen atoms of fluorine, methyl group, ethyl group, propyl group, butyl Group, s-butyl group, t-butyl group, pentyl group, hexyl group, heptyl group, octyl group, stearyl group, trichloromethyl group and other substituted or unsubstituted alkyl groups, phenyl group, naphthyl group, biphenyl group, anthranyl Group, phenanthryl group, fluorenyl group, pyrenyl group, 3-methylphenyl group, 3-methoxyphenyl group, 3-fluorophenyl group, 3-trichloromethylphenyl group, 3-trifluoromethylphenyl group, 3-nitrophenyl group, etc. Substituted or unsubstituted aryl group, methoxy group, n-butoxy group, t-butoxy group, trichloromethoxy group Trifluoroethoxy group, pentafluoropropoxy group, 2,2,3,3-tetrafluoropropoxy group, 1,1,1,3,3,3-hexafluoro-2-propoxy group, 6- (perfluoroethyl) Substituted or unsubstituted alkoxy group such as hexyloxy group, phenoxy group, p-nitrophenoxy group, pt-butylphenoxy group, 3-fluorophenoxy group, pentafluorophenoxy group, 3-trifluoromethylphenoxy group, etc. A substituted or unsubstituted aryloxy group, a methylthio group, an ethylthio group, a t-butylthio group, a hexylthio group, an octylthio group, a trifluoromethylthio group, or a substituted or unsubstituted alkylthio group, a phenylthio group, a p-nitrophenylthio group, pt-butylphenylthio group, 3-fluorophenylthio O group, pentafluorophenylthio group, substituted or unsubstituted arylthio group such as 3-trifluoromethylphenylthio group, cyano group, nitro group, amino group, methylamino group, ethylamino group, diethylamino group, dipropylamino Group, mono- or di-substituted amino group such as dibutylamino group, diphenylamino group, bis (acetoxymethyl) amino group, bis (acetoxyethyl) amino group, bis (acetoxypropyl) amino group, bis (acetoxybutyl) amino group, etc. Substituted or unsubstituted acylamino group, hydroxyl group, siloxy group, acyl group, carbamoyl group, methylcarbamoyl group, dimethylcarbamoyl group, ethylcarbamoyl group, diethylcarbamoyl group, propylcarbamoyl group, butylcarbamoyl group, phenylcarbamoyl group, etc. Mosquito Cycloalkyl groups such as bamoyl group, carboxylic acid group, sulfonic acid group, imide group, cyclopentane group, cyclohexyl group, pyridinyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, triazinyl group, indolinyl group, quinolinyl group, acridinyl group, Pyrrolidinyl, dioxanyl, piperidinyl, morpholinyl, piperazinyl, carbazolyl, furanyl, thiophenyl, oxazolyl, oxadiazolyl, benzoxazolyl, thiazolyl, thiadiazolyl, benzothiazolyl, triazolyl, imidazolyl And aromatic heterocyclic groups such as benzimidazolyl groups. Moreover, the above substituents may combine to form a further 6-membered aryl ring or heterocyclic ring.

In a preferred form of the organic EL element, a reducing dopant is contained in a region for transporting electrons or an interface region between the cathode and the organic layer. Here, the reducing dopant is defined as a substance capable of reducing the electron transporting compound. Accordingly, various materials can be used as long as they have a certain reducibility, such as alkali metals, alkaline earth metals, rare earth metals, alkali metal oxides, alkali metal halides, alkaline earth metals. Oxides, alkaline earth metal halides, rare earth metal oxides or rare earth metal halides, alkali metal carbonates, alkaline earth metal carbonates, rare earth metal carbonates, alkali metal organic complexes, alkalis At least one substance selected from the group consisting of organic complexes of earth metals and organic complexes of rare earth metals can be preferably used.

Specifically, preferable reducing dopants include Na (work function: 2.36 eV), K (work function: 2.28 eV), Rb (work function: 2.16 eV) and Cs (work function: 1. 95 eV), at least one alkali metal selected from the group consisting of Ca (work function: 2.9 eV), Sr (work function: 2.0 to 2.5 eV), and Ba (work function: 2.52 eV) At least one alkaline earth metal selected from the group consisting of: A work function of 2.9 eV or less is particularly preferable. Among these, a more preferable reducing dopant is at least one alkali metal selected from the group consisting of K, Rb and Cs, more preferably Rb or Cs, and most preferably Cs. These alkali metals have particularly high reducing ability, and the addition of a relatively small amount to the electron injection region can improve the light emission luminance and extend the life of the organic EL element. Further, as a reducing dopant having a work function of 2.9 eV or less, a combination of these two or more alkali metals is also preferable. Particularly, a combination containing Cs, for example, Cs and Na, Cs and K, Cs and Rb, A combination of Cs, Na and K is preferred. By including Cs in combination, the reducing ability can be efficiently exhibited, and by adding to the electron injection region, the emission luminance and the life of the organic EL element can be improved.

An electron injection layer composed of an insulator or a semiconductor may be further provided between the cathode and the organic layer. With such a layer, current leakage can be effectively prevented, and the electron injection property can be improved. If the electron injection layer is an insulating thin film, a more uniform thin film is formed, so that pixel defects such as dark spots can be reduced.

As the insulator, it is preferable to use at least one metal compound selected from the group consisting of alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides and alkaline earth metal halides. It is preferable that the electron injection layer is composed of these alkali metal chalcogenides and the like, since the electron injection property can be further improved. Specifically, preferable alkali metal chalcogenides include, for example, Li ₂ O, K ₂ O, Na ₂ S, Na ₂ Se, and Na ₂ O, and preferable alkaline earth metal chalcogenides include, for example, CaO, BaO. , SrO, BeO, BaS, and CaSe. Further, preferable alkali metal halides include, for example, LiF, NaF, KF, CsF, LiCl, KCl, and NaCl. Examples of preferable alkaline earth metal halides include fluorides such as CaF ₂ , BaF ₂ , SrF ₂ , MgF ₂ and BeF ₂ , and halides other than fluorides.

In addition, as a semiconductor constituting the electron injection layer, an oxide containing at least one element of Ba, Ca, Sr, Yb, Al, Ga, In, Li, Na, Cd, Mg, Si, Ta, Sb, and Zn. , Nitrides or oxynitrides, or a combination of two or more. The inorganic compound constituting the electron injection layer is preferably a microcrystalline or amorphous insulating thin film.

As the cathode, a material having a work function (for example, 4 eV or less) metal, an alloy, an electrically conductive compound, and a mixture thereof as an electrode material is used. Specific examples of such electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, cesium, magnesium / silver alloy, aluminum / aluminum oxide, Al / Li ₂ O, Al / LiO, Al / LiF, aluminum Examples include lithium alloys, indium, and rare earth metals.

The cathode can be produced from these electrode materials by vapor deposition or sputtering.
When light emitted from the light emitting layer is taken out from the cathode, the transmittance of the cathode for light emission is preferably greater than 10%. The sheet resistance as the cathode is preferably several hundred Ω / □ or less, and the film thickness is usually 10 nm to 1 μm, preferably 50 to 200 nm.

In general, since an organic EL element applies an electric field to an ultrathin film, pixel defects are likely to occur due to leakage or short circuit. In order to prevent this, an insulating thin film layer may be inserted between the pair of electrodes.
Examples of the material used for the insulating layer include aluminum oxide, lithium fluoride, lithium oxide, cesium fluoride, cesium oxide, magnesium oxide, magnesium fluoride, calcium oxide, calcium fluoride, aluminum nitride, titanium oxide, silicon oxide, Examples include germanium oxide, silicon nitride, boron nitride, molybdenum oxide, ruthenium oxide, and vanadium oxide. A mixture or laminate of these may be used.

Regarding the method for producing the organic EL element, for example, the above-described materials and methods may be used to sequentially form the necessary layers from the anode and finally form the cathode. Moreover, an organic EL element can also be produced in the reverse order from the cathode to the anode.

Hereinafter, an example of manufacturing an organic EL element having a structure in which an anode / a hole injection layer / a light emitting layer / an electron injection layer / a cathode are sequentially provided on a translucent substrate will be described.
First, a thin film made of an anode material is formed on a translucent substrate by vapor deposition or sputtering to form an anode. Next, a hole injection layer is provided on the anode. The hole injection layer can be formed by a method such as a vacuum deposition method, a spin coating method, a casting method, or an LB method. However, it is easy to obtain a uniform film and pinholes are not easily generated. It is preferable to form by a vacuum evaporation method. When a hole injection layer is formed by vacuum deposition, the deposition conditions vary depending on the compound used (material of the hole injection layer), the structure of the target hole injection layer, etc., but generally the deposition source temperature is 50 to 450. It is preferable to appropriately select at a temperature of 10 ° C., a degree of vacuum of 10 ⁻⁷ to 10 ⁻³ Torr, a deposition rate of 0.01 to 50 nm / second, and a substrate temperature of −50 to 300 ° C.

Next, a light emitting layer is provided on the hole injection layer. The light emitting layer can also be formed by thinning the light emitting material by a method such as vacuum deposition, sputtering, spin coating, or casting, but it is easy to obtain a uniform film and pinholes are not easily generated. From the point of view, it is preferable to form by vacuum deposition. When the light emitting layer is formed by vacuum vapor deposition, the vapor deposition conditions vary depending on the compound used, but can generally be selected from the same condition range as the formation of the hole injection layer.

Next, an electron injection layer is provided on the light emitting layer. Also in this case, like the hole injection layer and the light emitting layer, it is preferable to form by a vacuum evaporation method because it is necessary to obtain a homogeneous film. Deposition conditions can be selected from the same condition range as the hole injection layer and the light emitting layer.
And finally, a cathode can be laminated | stacked and an organic EL element can be obtained. The cathode can be formed by vapor deposition or sputtering. In order to protect the underlying organic material layer from damage during film formation, vacuum deposition is preferred.
The above organic EL device is preferably produced from the anode to the cathode consistently by a single vacuum.

The method for forming each layer of the organic EL element is not particularly limited. The organic thin film layer containing the anthracene derivative of the present invention can be prepared by vacuum deposition, molecular beam deposition (MBE method), dipping method of a solution obtained by dissolving the anthracene derivative of the present invention in a solvent, spin coating method, casting method, bar coating. It can be formed by a known method using a coating method such as a method or a roll coating method.

In the case of a method generally referred to as a coating method, that is, a method of forming each layer of an organic EL element using a solution containing an organic EL material, the solvent used is a good solvent for the organic EL material according to its purpose. It is possible to prepare and use a uniform solution, or to use a poor solvent or to prepare a dispersion using a mixed solvent of a good solvent and a poor solvent.

The organic EL material-containing solution of the present invention contains the above-described anthracene derivative of the present invention.
The solvent to be used is not particularly limited as long as it is generally available, and may be selected depending on the viscosity and solubility in accordance with process compatibility.
For example, those that are often good solvents include aromatic solvents, halogen solvents, ether solvents, and those that are often poor solvents include alcohol solvents, ketone solvents, paraffin solvents. Examples thereof include a solvent or an alkylbenzene derivative having 4 or more carbon atoms.

Specific examples are given below. Examples of solvents that are often good solvents include aromatic solvents such as toluene, xylene, mesitylene, halogen solvents such as chlorobenzene, and ether solvents such as diphenyl ether. Alcohol solvents, straight-chain or branched alcohols having 1 to 20 carbon atoms, such as methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, benzyl alcohol derivatives, hydroxyalkylbenzene derivatives, alkylbenzenes Examples thereof include linear or branched butylbenzene, dodecylbenzene, tetralin, cyclohexylbenzene, and the like.

The amount of the solvent used can be appropriately adjusted in consideration of the amount and type of the anthracene derivative, the thickness of the organic thin film layer, and the like.
The organic EL element of the present invention may be prepared by producing at least one organic thin film layer using the above-described organic EL material-containing solution of the present invention.
[Example]

Hereinafter, examples will be described, but the present invention is not limited to these examples.
Example 1
(1) Synthesis of anthracene derivative Compound (H-1) was synthesized by the following reaction.

2,6-Dibromoanthracene was brominated by a conventional method to synthesize Intermediate 1.
Next, in a 100 ml three-necked flask, 4.14 g (10.0 mmol) of the intermediate 1, 5.68 g (33.0 mmol) of naphthalene-2-boronic acid, tetrakis (triphenylphosphine) palladium (0) 1 0.04 g (0.9 mmol) was added, and the inside of the container was purged with argon. Further, 50 ml of toluene, 25 ml of dimethoxyethane, and 45 ml (3 eq) of 2M-sodium carbonate aqueous solution were added, and the mixture was heated to reflux in a 90 ° C. oil bath for 8 hours. After one night, the product was extracted with toluene / ion exchanged water and purified by column chromatography to obtain 3.62 g (yield 65.0%) of the target product H-1.
Subsequently, the halogen content was reduced according to the method described in JP-A-2007-77078 (yield 3.42 g, HPLC purity 99.9%, electrolytic detachment mass spectrometry (FD-MS): calculated value C ₄₆ H ₃₀ = 557, measured value m / z = 557 (M ⁺ , 100)).

(2) Manufacture of organic EL element A glass substrate (manufactured by Geomatic Co., Ltd.) with an ITO transparent electrode (anode) having a thickness of 25 mm × 75 mm × 1.1 mm was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then UV ozone cleaning. For 30 minutes. A glass substrate with a transparent electrode line after cleaning is attached to a substrate holder of a vacuum deposition apparatus, and first, the transparent electrode is covered on the surface on which the transparent electrode line is formed, and a film thickness is formed as a hole injection layer. The following compound A-1 having a thickness of 60 nm was formed. Following the formation of the A-1 film, the following compound A-2 having a thickness of 20 nm was formed as a hole transport layer on the A-1 film.
Further, on this A-2 film, the compound H-1 of the present invention and the diamine derivative D-1 were formed in a film thickness ratio of 40: 2 at a film thickness ratio of 40: 2 to obtain a blue light emitting layer. H-1 functions as a host and D-1 functions as a dopant.
On this film, the following compound Alq was deposited as an electron transport layer with a thickness of 20 nm by vapor deposition. Thereafter, LiF was formed to a thickness of 1 nm. On the LiF film, metal Al was deposited to a thickness of 150 nm to form a metal cathode, thereby forming an organic EL device.

Initial performance (chromaticity, luminous efficiency) and lifetime of the obtained organic EL device were evaluated. The results are shown in Table 1. It can be seen that long-lived blue light emission was obtained.
The evaluation of the organic EL element was as follows.
(1) Initial performance: The luminance value (luminous efficiency) and CIE1931 chromaticity coordinates at 10 mA / cm ² were measured and evaluated with a luminance meter (Spectral luminance radiometer CS-1000 manufactured by Minolta Co., Ltd.).
(2) Life: Driven by a constant current at an initial luminance of 1000 cd / m ² , and evaluated by a half life of luminance and a change in chromaticity.

Examples 2-4
A device was prepared and evaluated in the same manner as in Example 1 except that D-1 was changed to the following compounds shown in Table 1 in Example 1. The results are shown in Table 1.

Example 5
(1) Synthesis of anthracene derivatives

In a 100 ml three-necked flask, 6.72 g (20.0 mmol) of 2,6-dibromoanthracene, 7.57 g (44.0 mmol) of naphthalene-2-boronic acid, tetrakis (triphenylphosphine) palladium (0) 1 .39 g (1.2 mmol) was added, and the inside of the container was replaced with argon. Furthermore, 100 ml of toluene, 50 ml of dimethoxyethane, and 60 ml (3 eq) of 2M-sodium carbonate aqueous solution were added, and the mixture was heated to reflux in a 90 ° C. oil bath for 8 hours. After one night, extraction with toluene / ion exchange water and purification by column chromatography yielded 7.59 g of Intermediate 2 (yield 88.1%).

Next, intermediate 2 was brominated by a conventional method to obtain intermediate 3.
Next, in a 100 ml three-necked flask, 5.03 g (10.0 mmol) of Intermediate 3 and 2.73 g (11.0 mmol) of 2-naphthylphenylboronic acid, tetrakis (triphenylphosphine) palladium (0) 0. 347 g (0.3 mmol) was added, and the inside of the container was replaced with argon. Furthermore, 30 ml of toluene, 15 ml of dimethoxyethane, and 15 ml (3 eq) of 2M-sodium carbonate aqueous solution were added, and the mixture was heated to reflux in an oil bath at 90 ° C. for 8 hours. After one night, the product was extracted with toluene / ion exchanged water and purified by column chromatography to obtain 4.63 g (yield: 73.2%) of the target product, H-2.

Subsequently, the halogen content was reduced in accordance with the method described in JP-A-2007-77078 (yield 4.15 g, HPLC purity 99.9%, FD-MS calculated value C ₄₆ H ₃₀ = 633, measured value) m / z = 633 (M ⁺ , 100)).

(2) Manufacture of organic EL element It implemented similarly to Example 1. FIG. The results are shown in Table 1.

Examples 6-14
A device was prepared and evaluated in the same manner as in Example 1 except that H-1 and / or D-1 was changed to the following compounds shown in Table 1 in Example 1. The results are shown in Table 1.

Comparative Examples 1 and 2
A device was prepared and evaluated in the same manner as in Example 2 except that H-1 was changed to the following compound h-1 or h-2 in Example 2. The results are shown in Table 1.

Examples 15 to 26, Comparative Examples 3 and 4
A device was prepared and evaluated in the same manner as in Example 1 except that H-1 and / or D-1 was changed to the compounds shown in Table 2 in Example 1. The results are shown in Table 2.

As can be seen from Tables 1 and 2, when the anthracene derivative of the present invention is used as a light emitting material, an organic EL element having a long lifetime and emitting blue or green light can be obtained.

The anthracene derivative of the present invention can be used as a light emitting material for an organic EL device. Further, the organic EL device of the present invention can be suitably used for light sources such as flat light emitters and display backlights, display units such as mobile phones, PDAs, car navigation systems, and vehicle instrument panels, and lighting.
The entire contents of the documents described in this specification are incorporated herein by reference.

Claims

Anthracene derivatives represented by the following formula (1) or (2) (excluding compounds represented by the following formula (1 ′)).

(In the formula, Ar 1 to Ar 3 are each a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group. Ar 1 is any one of the substitution positions 1 to 4 of the anthracene ring. And Ar 2 is bonded to any of the substitution positions 5 to 8. The carbon atom on the anthracene skeleton to which Ar 1 to Ar 3 is not bonded is a hydrogen atom or an alkyl having 1 to 3 carbon atoms, respectively. Group is substituted.)

(Wherein Ar 4 to Ar 6 are each a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group. Ar 4 and Ar 5 are both substituted positions on the anthracene ring. Bonded to any of 1 to 4. Hydrogen or an alkyl group having 1 to 3 carbon atoms is bonded to the carbon atom on the anthracene skeleton to which Ar 4 to Ar 6 are not bonded.

(In the formula, Ar 1 to Ar 3 are the same as those in the formula (1).)
The anthracene derivative according to claim 1, which is represented by the following formulas (3) to (6):

(In the formula, Ar 1 to Ar 6 are the same groups as in claim 1).
A light emitting material comprising the anthracene derivative according to claim 1.
The luminescent material according to claim 3, wherein the anthracene derivative is a host material.
An anode and a cathode;
Having one or more organic thin film layers sandwiched between the anode and the cathode,
The organic electroluminescent element in which at least one layer of the said organic thin film layer contains the anthracene derivative of Claim 1 or 2.
The organic electroluminescence device according to claim 7, wherein the layer containing the anthracene derivative further contains at least one of a phosphorescent dopant and a fluorescent dopant.
The organic electroluminescence device according to claim 6, wherein the fluorescent dopant is at least one of an arylamine compound, a styrylamine compound, and a fluoranthene compound.
The organic electroluminescence device according to claim 6 or 7, wherein the phosphorescent dopant is a metal complex.
An organic electroluminescent material-containing solution containing the light emitting material according to claim 3 or 4.
An organic electroluminescent device produced using the organic electroluminescent material-containing solution according to claim 9.