摘要：

Colour stable organic white light-emitting devices(LEDs) were prepared with N,N-diphenyl-N,N″-bis(1-naphthyl)-(1,1-biphenyl)-4,4'-diamine(NPB) as the hole-transporting layer,cyano substituted oligo(p-phenylene vinylene)(CNDPDSB) as the emitting layer,2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP) as the hole-blocking layer,tris-(8-hydroxyquinoline) aluminum lq as electron-transporting layer.This type of device has a simple structure.The white light comes from the mixing of red exciplex emission at the solid-state interface between CNDPDSB and NPB and blue emissions from NPB and CNDPDSB,respectively.The white LEDs exhibit a maximum luminescence of 1200 cd/m2 and efficiency of 0.2 cd/A,and the Commission International De L'Eclairage(CIE) coordinates of emission vary from(0.33,0.34) to(0.31,0.37) with increasing the bias from 6 V to 13 V.

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