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:
Mar. 22, 2005
Filed:
May. 10, 2002
Andreas Richter, Ploessnitz, DE;
Dietmar Keil, Wolfen, DE;
Gerhard Diener, Koethen, DE;
Abstract
The invention concerns an electro-luminescent device in which the luminescent layer contains a compound of general formula I as doping agent or as luminescent compound, whereby the radicals Rto Rare identical or are different, and mean hydrogen, straight chain or branched C-Calkyl, aralkyl, aryl or substituted aryl; Rand Rand/or Rand Rand/or Rand Rand/or Rand Rand/or Rand Rand/or Rand Rcan form an alicyclic, heterocyclic or aromatic ring; Rcan furthermore be H, OH, OR, N,N-di-(C-C) alkylamino, acetylamino or halogen; Rand Rtogether can form an alicyclic or heterocyclic ring; Aand Aare identical or different and are —CN, —NOor —COOR; X is —CH, —CRor N; and Y is O, —NH, —NR, S or Se. The doping agents together luminesce predominately red with very good quantum efficiency together with the luminescent compound as a function of concentration.