有机发光二极管
量子效率
材料科学
磷光
兴奋剂
光电子学
系统间交叉
荧光
亮度
光化学
光学
纳米技术
单重态
化学
物理
图层(电子)
核物理学
激发态
作者
Chunya Du,Hui Liu,Zhuang Cheng,Shao-Qin Zhang,Zhi‐Rong Qu,Dezhi Yang,Xianfeng Qiao,Zujin Zhao,Ping Lü
标识
DOI:10.1002/adfm.202304854
摘要
Abstract The pursuit for efficient deep blue material is an ever‐increasing issue in organic optoelectronics field. It is a long‐standing challenge to achieve high external quantum efficiency (EQE) exceed 10% at brightness of 1000 cd m −2 with a Commission International de L'Eclairage (CIE y ) <0.08 in non‐doped organic light‐emitting diodes (OLEDs). Herein, this study reports a deep blue luminogen, PPITPh, by bonding phenanthro[9,10‐d]imidazole moiety with m‐terphenyl group via benzene bridge. The non‐doped OLED based on PPITPh exhibits an exceptionally high EQE of 11.83% with a CIE coordinate of (0.15, 0.07). The EQE still maintains 10.17% at the brightness of 1000 cd m −2 , and even at a brightness as high as 10000 cd m −2 , an EQE of 7.5% is still remained, representing the record‐high result among non‐doped deep‐blue OLEDs at 1000 cd m −2 . The unprecedented device performance is attributed to the reversed intersystem crossing process through hot exciton mechanism. Besides, the maximum EQE of orange phosphorescent OLED with PPITPh as host is 32.02%, and remains 31.17% at the brightness of 1000 cd m −2 . Such minimal efficiency roll‐off demonstrates that PPITPh is also an excellent phosphorescent host material. The result offers a new design strategy for the enrichment of high‐efficiency deep blue luminogen.
科研通智能强力驱动
Strongly Powered by AbleSci AI