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 benzene ring wherein R^4' and R^8' are 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 R¹⁰ is a nitrile radical -CN or a radical C(-X¹)-X²R¹, R¹¹ is a nitrile radical -CN or a radical -C(-X³)-X⁴R⁵, X¹ and X³ are oxygen, sulfur or imino, X² and X⁴ are oxygen, sulfur or optionally substituted amino, R¹-R⁸, R^4' and R^8' are H, C1-20-alkyl, aryl, heteroaryl, R⁴ and R⁸ can be halogen, nitro, cyanogen or amino, R²-R⁴, R⁶-R⁸, R^4' and R^8' can be trifluoromethyl or pentafluorophenyl, and wherein certain radicals can form a saturated or unsaturated ring. The devices are characterized by narrow emission bands, low driver voltages, high photometric efficiency and high thermal stability within a broad spectral range