有机发光二极管
磷光
激子
材料科学
亮度
量子效率
光电子学
电效率
二极管
发光二极管
图层(电子)
电致发光
光致发光
活动层
量子点
荧光
纳米技术
功率(物理)
光学
物理
凝聚态物理
量子力学
作者
Tianmu Zhang,Changsheng Shi,Chenyang Zhao,Zhongbin Wu,Jiangshan Chen,Zhiyuan Xie,Dongge Ma
标识
DOI:10.1021/acsami.8b00513
摘要
Phosphorescent organic light-emitting diodes (OLEDs) possess the property of high efficiency but have serious efficiency roll-off at high luminance. Herein, we manufactured high-efficiency phosphorescent OLEDs with extremely low roll-off by effectively locating the ultrathin emitting layer (UEML) away from the high-concentration exciton formation region. The strategic exciton management in this simple UEML architecture greatly suppressed the exciton annihilation due to the expansion of the exciton diffusion region; thus, this efficiency roll-off at high luminance was significantly improved. The resulting green phosphorescent OLEDs exhibited the maximum external quantum efficiency of 25.5%, current efficiency of 98.0 cd A–1, and power efficiency of 85.4 lm W–1 and still had 25.1%, 94.9 cd A–1, and 55.5 lm W–1 at 5000 cd m–2 luminance, and retained 24.3%, 92.7 cd A–1, and 49.3 lm W–1 at 10 000 cd m–2 luminance, respectively. Compared with the usual structures, the improvement demonstrated in this work displays potential value in applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI