Byeon Sung Yong, Lee Dong Ryun, Yook Kyoung Soo, Lee Jun Yeob
School of Chemical and Engineering, Sunkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 446-740, South Korea.
Adv Mater. 2019 Aug;31(34):e1803714. doi: 10.1002/adma.201803714. Epub 2019 Feb 13.
The external quantum efficiency (EQE) of organic light-emitting diodes (OLEDs) has been dramatically improved by developing highly efficient organic emitters such as phosphorescent emitters and thermally activated delayed fluorescent (TADF) emitters. However, high-EQE OLED technologies suffer from relatively poor device lifetimes in spite of their high EQEs. In particular, the short lifetimes of blue phosphorescent and TADF OLEDs remain a big hurdle to overcome. Therefore, the high-EQE approach harvesting singlet excitons of fluorescent emitters by energy transfer processes from the host or sensitizer has been explored as an alternative for high-EQE OLED strategies. Recently, there has been a big jump in the EQE and device lifetime of singlet-exciton-harvesting fluorescent OLEDs. Recent progress on the materials and device structure is discussed herein.
通过开发高效的有机发光体，如磷光发光体和热激活延迟荧光（TADF）发光体，有机发光二极管（OLED）的外量子效率（EQE）得到了显著提高。然而，尽管高EQE的OLED技术具有较高的EQE，但它们的器件寿命相对较短。特别是，蓝色磷光和TADF OLED的短寿命仍然是一个需要克服的大障碍。因此，通过从主体或敏化剂进行能量转移过程来收集荧光发光体单重态激子的高EQE方法已被探索为高EQE OLED策略的一种替代方案。最近，单重态激子收集型荧光OLED的EQE和器件寿命有了大幅提高。本文讨论了材料和器件结构方面的最新进展。
