Organic electroluminescent device and based on 2,5-diaminoterephthalic acid derivatives

• Main Authors: RICHTER ANDREAS, SCHONEWERK JENS, DIENER GERHARD
• Format: Patent
• Language: English
• Published: 06.01.2005
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY; SEMICONDUCTOR DEVICES

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 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 is a nitrile radical -CN or a radical C(=X )-X R , R is a nitrile radical -CN or a radical -C(=X )-X R , X and X are oxygen, sulfur or imino, X and X are oxygen, sulfur or optionally substituted amino, R -R , R<4'> and R are H, C1-20-alkyl, aryl, heteroaryl, R and R can be halogen, nitro, cyanogen or amino, R -R , R -R , 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.