激子
共发射极
光电子学
单重态
材料科学
有机发光二极管
发光二极管
二极管
量子效率
级联
化学
纳米技术
物理
原子物理学
激发态
量子力学
色谱法
图层(电子)
作者
Soon Ok Jeon,Jun Yeob Lee,Jong Soo Kim,Soo‐Ghang Ihn,Yeon Sook Chung,Ji Whan Kim,Hasup Lee,Sunghan Kim,Hye Jung Choi
出处
期刊:Nature Photonics
[Springer Nature]
日期:2021-02-15
卷期号:15 (3): 208-215
被引量:346
标识
DOI:10.1038/s41566-021-00763-5
摘要
Simultaneously achieving both a high efficiency and long lifetime in deep-blue organic light-emitting diodes is challenging. Here we report thermally activated delayed fluorescence (TADF) organic light-emitting diodes that aim to meet this goal by combining a new design of blue TADF materials with a triplet-exciton recycling protocol. Two TADF materials, one distributing and one emitting, were doped into a host to form triplet-exciton-distributed TADF devices. The singlet excitons were transferred from the host to the emitter via the distributing TADF material by cascade energy transfer, whereas the triplet excitons were transferred to the emitter as singlet excitons by a triplet-exciton recycling process between the low-triplet-energy host and the distributing TADF material. The resulting triplet-exciton-distributed TADF devices achieved a high external quantum efficiency of 33.5 ± 0.1, a colour coordinate corrected current efficiency over 400 cd A–1, a lifetime of >5,000 h and a y colour coordinate below 0.10.
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