ORGANIC ELECTROLUMINESCENT DEVICE BASED ON 2,5-DIAMINOTEREPHTHALIC ACID DERIVATIVES

摘要

The invention 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 the1,2 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> - 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> -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.