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US 2009/0021160 A1Published application
Material for organic electroluminescent device, method for producing same and organic electroluminescent device
AssigneeIdemitsu Kosan Co., Ltd.
InventorsKiyoshi Ikeda, Takayasu Sado, Hisayuki Kawamura
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Abstract
A material for an organic electroluminescence device which can be a cis-isomer or a trans-isomer of structural isomers, the content of the trans-isomer being more than that of the cis-isomer. The ratio (t/c) of the trans-isomer (t) and the cis-isomer (c) is preferably 2 or more.
Claims9
1:
- A material for an organic electroluminescence device which can be a cis-isomer or a trans-isomer of structural isomers,
- the content of the trans-isomer being more than that of the cis-isomer.
2:
- The material for an organic electroluminescence device according to claim 1 wherein the ratio (t/c) of the trans-isomer (t) and the cis-isomer (c) is 2 or more.
3:
- The material for an organic electroluminescence device according to claim 1 which is represented by the following formula (I):
- wherein Ar1 and Ar2 are a substituted or unsubstituted aryl group having 6 to 40 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 40 ring atoms;
- R1 to R8 are a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 40 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 40 ring atoms, a halogen atom, a cyano group or a nitro group;
- R1 to R8 may be the same or different, and adjacent groups thereof may form a saturated or unsaturated ring structure;
- and
- Ar1 and Ar2 have a relation of forming structural isomers.
3 more elements
4:
- The material for an organic electroluminescence device according to claim 3 wherein Ar1 and Ar2 of the formula (I) are an aryl group represented by the following formula (II):
- wherein X1 is a group forming a structural isomer, and is an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 40 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 40 ring atoms, a halogen atom, a cyano group or a nitro group;
- X2 to X5 are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 40 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 40 ring atoms, a halogen atom, a cyano group or a nitro group;
- and
- X1 to X5 may be the same or different, and adjacent groups thereof may form a saturated or unsaturated ring structure.
2 more elements
5:
- An organic electroluminescence device comprising:
- a pair of electrodes, and
- one or a plurality of organic layer(s) comprising an organic emitting layer, interposed between the pair of electrodes;
- the organic layer(s) containing the material for an organic device of claim 1.
1 more element
6:
- The organic electroluminescence device according to claim 5 wherein the emission zone of the organic layer(s) contain the material for an organic electroluminescence device.
7:
- The organic electroluminescence device according to claim 5 wherein the emitting layer contains the material for an organic electroluminescence device.
8:
- The organic electroluminescence device according to claim 7 wherein the emitting layer contains the material for an organic electroluminescence device as a main material.
9:
- A method for producing a material for an organic electroluminescence device comprising:
- heating a mixture of a cis-isomer and trans-isomer of the material which are structural isomers to cause the ratio (t/c) of the trans-isomer (t) and the cis-isomer (c) to be 2 or more.