Abstract
A white organic light-emitting diode (WOLED) with a high power efficiency has been demonstrated by dispersing a host-free, yellow phosphorescent material in between double blue phosphorescent emitters. The device performance achieved a comparable value to that of using a complicated host–guest doping system to form the yellow emitter in WOLEDs. Based on this device concept as well as the molecular engineering of blue phosphorescent host material and light-extraction film, a WOLED with a power efficiency of 65 lm W−1 at a practical brightness of 1000 cd m−2 with Commission Internationale d'Echariage coordinates (CIEx,y) of (0.37, 0.47) was achieved.
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