Sensient Imaging Technologies Gmbh

Dietmar Keil

Andreas Richter

Gerhard Diener

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 &#x2014;CN, &#x2014;NOor &#x2014;COOR; X is &#x2014;CH, &#x2014;CRor N; and Y is O, &#x2014;NH, &#x2014;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.

Organic red electro-luminescent device including a heterocyclic emitter

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, &#x2014;OR, &#x2014;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 &#x2014;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.

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Wolfen, Germany

Dietmar Keil