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

US7141312B2 · kind B2 · utility

Assignee

• Sensient Imaging Technologies GmbH · DE

Inventors

• Andreas Richter · Gaimersheim, DE
• Jens Schöenewerk · Grimma, DE
• Gerhard Diener · Harsefeld, DE

Key dates

• Filing date: Feb 20, 2004
• Grant date: Nov 28, 2006
• Expiry date: Feb 20, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S428/917
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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 benzene ring wherein R4′ and R8′ 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 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, sulphur or imino, X2 and X4 are oxygen, sulphur or optionally substituted amino, R1 to R8, R4′ and R8′ are H, C1–C20-alkyl, aryl, heteroaryl, R4 and R8 can also be halogen, nitro, cyanogen or amino, R2 to R4, R6–R8, R4′ and R8′ can also be trifluoromethyl or pentafluorophenyl, wherein certain radicals can form a saturated or unsaturated ring. The novel devices are characterized by narrow emission bands, low driver voltages, high photometric efficiency and high thermal stability within a broad spectral range.