利用激基复合物发光的有机白光器件制备

以1,4-二(2-氰基-2-苯乙烯基)-2,5-二苯基苯(CNDPDSB)为发光层, N,N'-3-萘基]-N,N'-二苯基1,1'-二苯基]-4,4'-二胺(NPB)为空穴传输层, 8-羟基喹啉铝(Alq)为电子传输层, 制备了一种色度稳定的有机电致白光器件. 该器件的白光发射是由CNDPDSB与NPB界面形成的激基复合物发出的红光以及NPB与CNDPDSB发射的蓝光混合而成. 该白光器件的光谱稳定, 在工作电压(6~13 V)内, 色坐标由(0.33, 0.34)变化到(0.31, 0.37). 器件在6 V电压下开启, 10 V电压下的亮度和效率分别为1200 cd/m2和0.2 cd/A.

Preparation of Organic White Light-emitting Devices via Exciplex Emission

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.