| 摘要 |
The application relates to an organic electroluminescent device which contains 2,5 diaminoterephthalic acid derivatives of formula 1a as emitter substances in one or several emitter layers in a pure or doped manner. The ring A is a triple unsaturated benzole ring wherein R<4'> and R<8'> are equal to zero or ring A is a double unsaturated ring respectively provided with a double bond in the 1,2 position and 4,5-position, and wherein R<10 >is a nitrile radical -CN or a radical C(=X<1>)-X<2>R<1>; R<11 >is a nitrile radical -CN or a radical -C(=X<3>)-X<4>R<5>, X<1 >and X<3 >are oxygen, sulphur or imino, X<2 >and X<4 >are oxygen, sulphur or optionally substituted amino, R<1 >to R<8>, R<4'> and R<8'> are H, C1-C20-alkyl, aryl, heteroaryl, R<4 >and R<8 >can also be halogen, nitro, cyanogen or amino, R<2 >to R<4>, R<6>-R<8>, R<4'> and R<8'> can also be trifluoromethyl or pentafluorophenyl, and wherein certain radicals can form a saturated or unsaturated ring. The novel devices are characterised by narrow emission bands, low driver voltages, high photometric efficiency and high thermal stability within a broad spectral range.
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