Chiral perturbation in D-O-A organic phosphors towards efficient circularly polarized electroluminescence

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-08-12 DOI:10.1007/s40843-024-3042-1

Ying Yang, Shuai Xiao, Yan Zhou, Changsheng Shi, Lulin Xu, Xiangji Liao, Ning Su, Ning Sun, You-Xuan Zheng, Liming Ding, Junqiao Ding

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Abstract

Chiral organic phosphors with room-temperature phosphorescence (RTP) show a great potential in high-performance circularly polarized organic light-emitting diodes (CP-OLEDs). As a proof of concept, herein, we report a pair of chiral RTP enantiomers (S/R)-CP-RTP-D1 with acridine as the donor (D), triazine as the acceptor (A), oxygen as the bridge, and (S/R)-2-methylbutane as the chiral alkyl chain. It is found that the effective chiral perturbation can endow (S/R)-CP-RTP-D1 with mirror symmetric chiroptical properties, while maintaining the characteristic RTP emission. Consequently, the corresponding doped and non-doped CP-OLEDs based on (S/R)-CP-RTP-D1 achieve obvious circularly polarized electroluminescence (CPEL) signals, revealing promising external quantum efficiencies of 14.9% and 13.0% with the dissymmetry factors ∣g_EL∣ of 7.00 × 10⁻⁴ and 9.87 × 10⁻⁴, respectively. These results highlight that chiral perturbation in D-O-A organic phosphors is a reliable strategy towards efficient CPEL.

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D-O-A 有机荧光粉中的手性扰动，实现高效圆极化电致发光

具有室温磷光（RTP）的手性有机荧光粉在高性能圆偏振有机发光二极管（CP-OLED）中显示出巨大的潜力。作为概念验证，我们在本文中报告了一对手性 RTP 对映体 (S/R)-CP-RTP-D1，其中吖啶为供体（D），三嗪为受体（A），氧为桥，(S/R)-2-甲基丁烷为手性烷基链。研究发现，有效的手性扰动可以赋予 (S/R)-CP-RTP-D1 镜像对称的千光特性，同时保持 RTP 发射的特征。因此，基于（S/R）-CP-RTP-D1 的相应掺杂和非掺杂 CP-OLED 实现了明显的圆偏振电致发光（CPEL）信号，外部量子效率分别达到 14.9% 和 13.0%，不对称因子 ∣gEL∣ 分别为 7.00 × 10-4 和 9.87 × 10-4。这些结果表明，D-O-A 有机荧光粉中的手性扰动是实现高效 CPEL 的可靠策略。

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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.