Acceleration of reverse intersystem crossing in multi-resonance TADF emitter

IF 19.1 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Chem Pub Date : 2024-05-09 DOI:10.1016/j.chempr.2024.01.018

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":"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>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.</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}

引用次数: 0

Abstract

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 (k_RISC) 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 k_RISC of multi-resonance TADF emitters by the synergetic long-range charge transfer and heavy-atom effect. The proof-of-concept emitter shows a rapid k_RISC of 2.2 × 10⁶ s⁻¹ and a radiative decay rate (k_r) 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.

Abstract Image

查看原文本刊更多论文

加速多共振 TADF 发射器中的反向系统间交叉

最前沿的有机发光二极管（OLED）应用需要在高亮度下运行的高器件效率，这对器件的效率滚降提出了很高的要求。热激活延迟荧光（TADF）发射器的快速反向系统间穿越率（kRISC）对于实现低效率滚降的高性能有机发光二极管至关重要。在此，我们展示了一种通过长程电荷转移和重原子效应协同作用来加速多共振 TADF 发射器 kRISC 的有效方法。概念验证发射器的快速 kRISC 为 2.2 × 106 s-1，辐射衰减率 (kr) 为 4.9 × 107 s-1，光致发光量子产率接近统一。利用这些优异特性，相应的有机发光二极管器件实现了近 30% 的最大外部量子效率 (EQE)，且效率衰减极小，即使在 10,000 cd m-2 的亮度下也能保持 25.1% 的 EQE。这项研究为解决有机发光二极管的效率衰减问题提供了一种崭新而有影响力的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Chem Environmental Science-Environmental Chemistry

CiteScore

32.40

自引率

1.30%

发文量

281

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.