Abstract
We demonstrate a nondoped white organic light-emitting diode in which the blue, green, and red emissions are generated from -bis(-diphenylvinyl)--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 -diphenyl--bis(1-naphthyl)(1,-benzidine)-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 chromaticity-tuning NPB layer gives the Commission Internationale de l’Eclairage-1931 coordinate of (0.327, 0.336), a color rendering index of 90.2, a maximum luminance of , and a maximum current efficiency of . The electroluminescence mechanism of the white device was also discussed.
© 2007 Optical Society of America
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