Reddish organic light electroluminescent device with DPP emitting layer

The red light emission from organic molecules is much less common than that of the other two basic colours. At the present moment, most red light emit ting organic molecules are rare earth complexes, which are known to have st ability problem. In the present work, a non-metal complex based organic mat erial, [2-(p-dimethyl-aminophenyl)ethenyl]-phenyl-methylene-propanedinitril e (DPP), with a narrow reddish orange emission was synthesized and used to fabricate a electroluminescence device. The device has a configuration of g lass/indium tin oxide/N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4-4 '-diamine)/DPP/tris(8-hydroxyquinoline)/ Mg:Ag. A maximum luminous density of 146 cd/m(2) was observed at 13.5 V.