Abstract

In this study, blue exciplex electroluminescence was observed under both optical and electrical excitation during mixing of the extensively used hole-transport material tris(4-carbazoyl-9-ylphenyl)amine and electron-transport material, 4,7-diphenyl-1,10-phenanthroline. Comprehensive experiments demonstrated efficient energy transfer from the blue exciplex to the green and red phosphors. We successfully introduced a unique white organic light-emitting device that used a singlet state exciplex as the blue emitter in combination with green and red phosphors to yield white light with an external quantum efficiency of 10.5% at 1000 cd/m2 and satisfied Commission Internationale de l’Éclairage color coordinates of and the corresponding color rendering index of 81.

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