Effective Design Strategy for Thermally Activated Delayed Fluorescence Emitters with Aggregation-Induced emission to Enable Sky-blue OLEDs Achieving EQE Nearly 30%

IF 7.6 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Chemical Science Pub Date : 2024-11-20 DOI:10.1039/d4sc06613h

Hui Dai, Yaohui Liang, Xiang Long, Tianyi Tang, Haozhi Xie, Zhiwei Ma, Gaoyu Li, Zhiyong Yang, Juan Zhao, Zhenguo Chi

引用次数: 0

Abstract

Pure organic thermally activated delayed fluorescence (TADF) materials hold great promise for efficient organic light-emitting diodes (OLEDs), yet developing high-performing blue TADF materials that integrate short delayed lifetime with aggregation induced emission (AIE) property remains a significant challenge. In this study, we developed three highly-efficient blue TADF emitters (32clCBP, 32clCXT and 32PclCXT) featuring AIE characteristics by integrating rigid π-extended donors with different acceptors. Notably, in the doped 32PclCXT film achieved an exceptionally high photoluminescence quantum efficiency of up to 99% and a short delayed lifetime of 1.4 µs. Furthermore, the fabricated OLEDs based on 32PclCXT exhibited an impressive external quantum efficiency of 29.9% in the sky-blue region, along with low roll-off at high luminance. Therefore, this work establishes a new strategy for developing high-efficiency blue TADF materials and devices.

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具有聚集诱导发射的热激活延迟荧光发射器的有效设计策略，使天蓝色 OLED 的 EQE 接近 30

纯有机热激活延迟荧光（TADF）材料在高效有机发光二极管（OLED）中大有可为，但开发集短延迟寿命和聚集诱导发射（AIE）特性于一体的高性能蓝色 TADF 材料仍是一项重大挑战。在这项研究中，我们开发了三种高效蓝色 TADF 发射器（32clCBP、32clCXT 和 32PclCXT），它们通过将刚性 π 延伸的供体与不同的受体整合在一起而具有 AIE 特性。值得注意的是，掺杂 32PclCXT 薄膜的光致发光量子效率高达 99%，延迟寿命短至 1.4 µs。此外，基于 32PclCXT 制成的有机发光二极管在天蓝色区域的外部量子效率达到了惊人的 29.9%，并且在高亮度下的衰减较低。因此，这项工作为开发高效蓝色 TADF 材料和器件确立了新的战略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Science CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

14.40

自引率

4.80%

发文量

1352

审稿时长

2.1 months

期刊介绍： Chemical Science is a journal that encompasses various disciplines within the chemical sciences. Its scope includes publishing ground-breaking research with significant implications for its respective field, as well as appealing to a wider audience in related areas. To be considered for publication, articles must showcase innovative and original advances in their field of study and be presented in a manner that is understandable to scientists from diverse backgrounds. However, the journal generally does not publish highly specialized research.