WHITE LIGHT-EMITTING ORGANIC ELECTROLUMINESCENT DEVICES USING THE POLY(N-VINYLCARBAZOLE) EMITTER LAYER DOPED WITH 3 FLUORESCENT DYES

White light-emitting electroluminescent devices were fabricated using poly(N-vinylcarbazole) (PVK) as a hole-transporting emitter layer and a double layer of 1, 2, 4-triazole derivative (TAZ) and tris(8-quinoli nolato)aluminum(III) complex (Alq) as an electron transport layer. The PVK layer was doped with fluorescent dyes such as blue-emitting 1, 1, 4, 4-tetraphenyl-1, 3-butadiene, green-emitting coumarin 6, and orang e-emitting DCM 1. A cell structure of glass substrate/indium-tin-oxide /doped PVK/TAZ/Alq/Mg:Ag was employed. White emission covering a wide range of the visible region and a high luminance of 3400 cd/m(2) were obtained at a drive voltage of 14 V.