Yang Zou , Mingxin Yu , Yulin Xu , Zhengqi Xiao , Xiufang Song , Yuxuan Hu , Zhongyang Xu , Cheng Zhong , Jiawei He , Xiaosong Cao , Kai Li , Jingsheng Miao , Chuluo Yang
{"title":"加速多共振 TADF 发射器中的反向系统间交叉","authors":"Yang Zou , Mingxin Yu , Yulin Xu , Zhengqi Xiao , Xiufang Song , Yuxuan Hu , Zhongyang Xu , Cheng Zhong , Jiawei He , Xiaosong Cao , Kai Li , Jingsheng Miao , Chuluo Yang","doi":"10.1016/j.chempr.2024.01.018","DOIUrl":null,"url":null,"abstract":"<div><p>The cutting-edge organic light-emitting diode (OLED) applications require high device efficiency operating at high brightness, placing high demand on the device efficiency roll-off. The rapid reverse intersystem crossing rate (<em>k</em><sub>RISC</sub>) of the thermally activated delayed fluorescence (TADF) emitter is crucial for achieving high-performance OLEDs with low efficiency roll-off. Herein, we demonstrate an effective approach to accelerate the <em>k</em><sub>RISC</sub> of multi-resonance TADF emitters by the synergetic long-range charge transfer and heavy-atom effect. The proof-of-concept emitter shows a rapid <em>k</em><sub>RISC</sub> of 2.2 × 10<sup>6</sup> s<sup>−1</sup> and a radiative decay rate (<em>k</em><sub>r</sub>) of 4.9 × 10<sup>7</sup> s<sup>−1</sup> together with a near-unity photoluminescence quantum yield. Leveraging these exceptional properties, the corresponding OLED devices achieve a maximum external quantum efficiency (EQE) of nearly 30% with minimal efficiency roll-off, maintaining an EQE of 25.1% even at the brightness of 10,000 cd m<sup>−2</sup>. This study offers a fresh and impactful approach to tackle the efficiency roll-off concern in OLEDs.</p></div>","PeriodicalId":268,"journal":{"name":"Chem","volume":"10 5","pages":"Pages 1485-1501"},"PeriodicalIF":19.1000,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Acceleration of reverse intersystem crossing in multi-resonance TADF emitter\",\"authors\":\"Yang Zou , Mingxin Yu , Yulin Xu , Zhengqi Xiao , Xiufang Song , Yuxuan Hu , Zhongyang Xu , Cheng Zhong , Jiawei He , Xiaosong Cao , Kai Li , Jingsheng Miao , Chuluo Yang\",\"doi\":\"10.1016/j.chempr.2024.01.018\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The cutting-edge organic light-emitting diode (OLED) applications require high device efficiency operating at high brightness, placing high demand on the device efficiency roll-off. The rapid reverse intersystem crossing rate (<em>k</em><sub>RISC</sub>) of the thermally activated delayed fluorescence (TADF) emitter is crucial for achieving high-performance OLEDs with low efficiency roll-off. Herein, we demonstrate an effective approach to accelerate the <em>k</em><sub>RISC</sub> of multi-resonance TADF emitters by the synergetic long-range charge transfer and heavy-atom effect. The proof-of-concept emitter shows a rapid <em>k</em><sub>RISC</sub> of 2.2 × 10<sup>6</sup> s<sup>−1</sup> and a radiative decay rate (<em>k</em><sub>r</sub>) of 4.9 × 10<sup>7</sup> s<sup>−1</sup> together with a near-unity photoluminescence quantum yield. Leveraging these exceptional properties, the corresponding OLED devices achieve a maximum external quantum efficiency (EQE) of nearly 30% with minimal efficiency roll-off, maintaining an EQE of 25.1% even at the brightness of 10,000 cd m<sup>−2</sup>. This study offers a fresh and impactful approach to tackle the efficiency roll-off concern in OLEDs.</p></div>\",\"PeriodicalId\":268,\"journal\":{\"name\":\"Chem\",\"volume\":\"10 5\",\"pages\":\"Pages 1485-1501\"},\"PeriodicalIF\":19.1000,\"publicationDate\":\"2024-05-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chem\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2451929424000391\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chem","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451929424000391","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Acceleration of reverse intersystem crossing in multi-resonance TADF emitter
The cutting-edge organic light-emitting diode (OLED) applications require high device efficiency operating at high brightness, placing high demand on the device efficiency roll-off. The rapid reverse intersystem crossing rate (kRISC) of the thermally activated delayed fluorescence (TADF) emitter is crucial for achieving high-performance OLEDs with low efficiency roll-off. Herein, we demonstrate an effective approach to accelerate the kRISC of multi-resonance TADF emitters by the synergetic long-range charge transfer and heavy-atom effect. The proof-of-concept emitter shows a rapid kRISC of 2.2 × 106 s−1 and a radiative decay rate (kr) of 4.9 × 107 s−1 together with a near-unity photoluminescence quantum yield. Leveraging these exceptional properties, the corresponding OLED devices achieve a maximum external quantum efficiency (EQE) of nearly 30% with minimal efficiency roll-off, maintaining an EQE of 25.1% even at the brightness of 10,000 cd m−2. This study offers a fresh and impactful approach to tackle the efficiency roll-off concern in OLEDs.
期刊介绍：
Chem, affiliated with Cell as its sister journal, serves as a platform for groundbreaking research and illustrates how fundamental inquiries in chemistry and its related fields can contribute to addressing future global challenges. It was established in 2016, and is currently edited by Robert Eagling.
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