Optimization of boron-containing acceptors towards high-efficiency TADF emitters: sky-blue OLEDs with external quantum efficiency of 32.6%

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science China Materials Pub Date : 2024-09-10 DOI:10.1007/s40843-024-3047-4

Xu Gong (, ), Wei Yang (, ), He Zhang (, ), Weimin Ning (, ), Shaolong Gong (, ), Xiang Gao (, ), Chuluo Yang (, )

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Abstract

Two new thermally activated delayed fluorescence (TADF) molecules, 13-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-5,5-dimethyl-5,13-dihydrobenzo[4,5]thieno[3,2-c]acridine (BOBT) and 13-(4-(dimesitylboranyl)-3,5-dimethylphenyl)-5,5-dimethyl-5,13-dihydrobenzo[4,5]thieno[3,2-c]acridine (BPBT), are constructed via connecting the 5,5-dimethyl-5,13-dihydrobenzo[4,5]thieno[3,2-c]acridine (BTDMAC) donor (D) with triarylboron or oxygen-bridged cyclized boron acceptors (A), respectively. In comparison with the photoluminescence quantum yield (PLQY) of 84% for BPBT, BOBT shows a higher PLQY of 100%, due to the multi-resonance effect of the boron-oxygen skeleton. In addition, the D-A-type molecular structural characteristic endows the boron-containing BOBT emitter with a fast reverse intersystem crossing rate on the order of 10⁶ s⁻¹. The sky-blue organic light-emitting diode (OLED) employing the BOBT emitter achieves state-of-the-art device performances with a high external quantum efficiency of 32.6%.

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优化含硼受体，实现高效 TADF 发射器：外部量子效率达 32.6% 的天蓝色 OLED

5,5 二甲基-5,13-二氢苯并[4,5]噻吩并[3,2-c]吖啶（BPBT），分别通过连接 5,5 二甲基-5,13-二氢苯并[4,5]噻吩并[3,2-c]吖啶（BTDMAC）供体（D）和三芳基硼或氧桥环化硼受体（A）而构建。与 BPBT 84% 的光致发光量子产率（PLQY）相比，BOBT 的光致发光量子产率更高，达到 100%，这是由于硼氧骨架的多共振效应。此外，D-A 型分子结构特性使含硼的 BOBT 发光体具有 106 s-1 量级的快速反向系统间穿越率。采用这种 BOBT 发射器的天蓝色有机发光二极管（OLED）实现了最先进的器件性能，外部量子效率高达 32.6%。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.