Abstract
High-performance top-emitting white organic light-emitting device (WOLED), using Al as the reflective bottom anode and LiF/Ca/Au as the semitransparent top cathode, has been fabricated. The WOLED consisted of three emissive layers with red, green, blue phosphorescent emitters, respectively. Its microcavity structure was optimized by varying the thicknesses of the organic functional layers and the dielectric capping layer of the semitransparent top cathode using an optical model. The WOLED showed a maximum external quantum efficiency of 9.1% and a maximum power efficiency of 12.8 lm/W. As well, broadband emission spectra with very weak angle dependence were achieved. The emission in normal direction has a Commission Internationale de L'Eclairage coordinates of (x,y)=(0.36,0.43). The characteristics of this top-emitting WOLED are competitive with those of bottom-emitting devices.
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