White light emission from a single layer organic light emitting diode fabricated by spincoating

We report on white light emission from an organic light, emitting diode (OL ED) prepared by spin coating. The organic layer is a single layer of polyst yrene, in which we incorporate rubrene for orange emission and the phenylen e-vinylene trimer, 1,4-bis(1,1-diphenyl-2-ethenyl) benzene (PEB) for blue e mission. These two colors blend to white. The Commission Internationale de L'Eclairage coordinates are x = 0.30 and y = 0.37. When fabricated with an air-stable Al cathode, our white OLED has a quantum efficiency of 0.3%, a c urrent efficiency of 0.9 cd/A and a brightness of 1500 cd/m(2). (C) 2000 El sevier Science B.V. All rights reserved.