High-efficiency and high-luminance three-color white organic light-emitting diodes with low efficiency roll-off

• Main Authors: Zhou, Junhong, Zou, Jianhua, Dai, Caihong, Zhang, Yong, Luo, Xudong, Liu, Baiquan
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2019
• Subjects: Organic Light-emitting Diodes; Engineering::Electrical and electronic engineering; Low Efficiency Roll-off
• Online Access: https://hdl.handle.net/10356/82621; http://hdl.handle.net/10220/49082
• Institution: Nanyang Technological University

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 c d / m2, 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 c d / m2. 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.