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:
Jan. 18, 2005
Filed:
May. 10, 2002
Andreas Richter, Ploessnitz, DE;
Dietmar Keil, Wolfen, DE;
Gerhard Diener, Köthen, DE;
Sensient Imaging Technologies GmbH, Wolfen, DE;
Abstract
The invention relates to an electroluminescent device, in which the luminescent layer contains a luminescent compound and a compound of the general formula I as doping agent, wherein B is an unsaturated carbocyclic or heterocyclic 4-8-link ring, which can also contain an alicyclic bridge, the rings D and E are five- or six-link rings, which each can contain one more hetero-atom N, O and S, the radicals R are one or more substituents H or straight-chain or branched C-C-alkyl, X and Y are carbon or nitrogen, R; Rand Rare H or straight-chain or branched C-C-alkyl, Rand Rare hydrogen, straight-chain or branched C-C-alkyl, hydroxy, —OR, —COOR, N,N-dialkylamino, acetylamino or halogen, wherein Ris hydrogen, or straight-chain or branched C-C-alkyl, Rand Ror Rand Rand/or Rand Rtogether can form an alicyclic, heterocyclic or aromatic ring, and Aand A, which can be the same or different, are cyan, nitro or —COOR. The compounds I are partly new. Together with the luminescent compound, the doping agents have a red or white color, depending on the concentration, with excellent quantum efficiency.