Abstract: 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.

Key words: Exciplex emission, Organic electroluminescence, White light emission