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 3nm 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 19,096cdm2, and a maximum current efficiency of 4.12cdA. The electroluminescence mechanism of the white device was also discussed.

© 2007 Optical Society of America

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