High-Efficiency and High-Luminance Three-Color White Organic Light-Emitting Diodes with Low Efficiency Roll-Off

For the first time, double blue emitting layers have been functioned as the main exciton generation zone to achieve high-performance three-color phosphorescent white organic light-emitting diodes (WOLEDs). The WOLED exhibits the maximum forward-viewing external quantum efficiency (EQE) and power efficiency (PE) of 21.2% and 50.0 lm/W, respectively. Even at 1000 cd/m 2 , the forward-viewing EQE and PE are as high as 18.0% and 32.5 lm/W, respectively, indicating low efficiency roll-off. Besides, the WOLED shows a maximum luminance of 81156 cd/m 2 . Moreover, by manipulating the excitons distribution, a WOLED can achieve a high color rendering index of 80. The findings may provide a new opportunity to achieve high-efficiency, high-luminance and low efficiency roll-off WOLEDs.