Improving the Power Efficiency of Solution‐Processed Phosphorescent WOLEDs with a Self‐Host Blue Iridium Dendrimer

Solution‐processed phosphorescent white organic light‐emitting diodes (WOLEDs) with improved power efficiency are reported by simply blending a yellow phosphor Ir(Flpy‐CF3)3 into a self‐host blue Ir dendrimer B‐G2. Attributable to the elimination of the host‐induced power efficiency losses existed in the traditional host‐based devices, a state‐of‐the‐art total power efficiency as high as 48.8–62.8 lm W−1 is achieved at a practical luminance of 1000 cd m−2. Moreover, without considerably sacrificing the power efficiency, the related correlated color temperature and Commission Internationale de L'Eclairage coordinates can be well tuned to satisfy different illumination requirements. The results clearly demonstrate that the adoption of a self‐host blue phosphorescent dendrimer instead of the traditional host‐based device structure is a superior and promising strategy to realize power‐efficient white‐light emitting devices.