title: Lighting object-based nondoped-type white organic light-emitting diode with N,N'-diphenyl-N,N'-bis(1-naphthyl)-(1,1'-benzidine)-4,4'-diamine as the chromaticity-tuning layer.
abstract: We demonstrate a nondoped white organic light-emitting diode in which the blue, green, and red emissions are generated from 4,4(')-bis(2,2(')-diphenylvinyl)-1,1(')-biphenyl, tris(8-hydroxyquinoline)aluminum, and a submonolayer of 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7- tetramethyl-julolidyl 9-enyl)-4H-pyran layers, respectively. A thin layer of N,N(')-diphenyl-N,N(')-bis(1-naphthyl)(1,1(')-benzidine)-4,4(')-diamine (NPB), which differed from the traditional hole-transporting layer, was introduced into the device. The thickness of this thin NPB layer was changed to tune the chromaticity and optimize the white color quality. The white device with a 3 nm chromaticity-tuning NPB layer gives the Commission Internationale de l'Eclairage-1931 xy coordinate of (0.327, 0.336), a color rendering index of 90.2, a maximum luminance of 19,096 cd/m(2), and a maximum current efficiency of 4.12 cd/A. The electroluminescence mechanism of the white device was also discussed.
authors: Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
authors: Jianzhuo
authors: J
authors: Zhu
authors: Wenlian
authors: W
authors: Li
authors: Zisheng
authors: Z
authors: Su
authors: Bei
authors: B
authors: Chu
authors: Liangliang
authors: L
authors: Han
authors: Dongfang
authors: D
authors: Yang
authors: Defeng
authors: D
authors: Bi
authors: Bin
authors: B
authors: Li
authors: Zhizhi
authors: Z
authors: Hu
authors: Zhiqiang
authors: Z
authors: Zhang
authors: Taiju
authors: T
authors: Tsuboi