The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 2006
Filed:
Aug. 21, 2002
Andreas Richter, Ploessnitz, DE;
Jens Schoenewerk, Grimma, DE;
Gerhard Diener, Koethen, DE;
Sensient Imaging Technologies GmbH, Wolfen, DE;
Abstract
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 Rand Rare 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 Ris a nitrile radical —CN or a radical C(═X)—XR, Ris a nitrile radical —CN or a radical —C(═X)—XR, Xand Xare oxygen, sulfur or imino, Xand Xare oxygen, sulfur or optionally substituted amino, R–R, Rand Rare H, C1–20-alkyl, aryl, heteroaryl, Rand Rcan be halogen, nitro, cyanogen or amino, R–R, R–R, Rand Rcan 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