Regulating Photophysical Property of Aggregation-Induced Delayed Fluorescence Luminogens via Heavy Atom Effect to Achieve Efficient Organic Light-Emitting Diodes,Advanced Optical Materials

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Regulating Photophysical Property of Aggregation-Induced Delayed Fluorescence Luminogens via Heavy Atom Effect to Achieve Efficient Organic Light-Emitting Diodes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-02-12 , DOI: 10.1002/adom.202102568
Jingwen Xu ₁ , Xing Wu ₁ , Jinshi Li ₁ , Zujin Zhao ₁ , Ben Zhong Tang _{1,

2,

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Affiliation

Heavy atom effect is beneficial to delayed fluorescence by enlarging spin–orbit coupling (SOC). The introduction of halogen atoms to luminogenic molecules is a widely used approach to realize heavy atom effect, but the positions of halogen atoms may exert quite different impacts on the photophysical properties of the molecules. To confirm this hypothesis, herein, bromine atoms are introduced on a delayed fluorescence luminogen comprised of benzoyl acceptor and phenoxazine and phenylcarbazole donors at different positions. The resultant luminogens show great differences in photoluminescence (PL) efficiencies and delayed fluorescence lifetimes in solid state, which could be attributed to different orbital contribution ratios of bromine atoms to molecular frontier orbitals and thus varied SOC interactions, as revealed by spectroscopy, crystallography, and theoretical calculation. The luminogens with bromine atoms on the phenylcarbazole units hold much better PL properties than those with bromine atoms on other positions, and behave efficiently as emitters in organic light-emitting diodes, furnishing high external quantum efficiencies of up to 28.6% and small efficiency roll-offs. The structure–property relationship gained in this work can provide guidance for the further design of efficient luminescent materials.

中文翻译：

通过重原子效应调节聚集诱导延迟荧光发光剂的光物理性质以实现高效有机发光二极管

重原子效应通过扩大自旋轨道耦合（SOC）有利于延迟荧光。将卤素原子引入发光分子是实现重原子效应的一种广泛使用的方法，但卤素原子的位置可能对分子的光物理性质产生截然不同的影响。为了证实这一假设，本文将溴原子引入到由苯甲酰基受体和吩恶嗪和苯基咔唑供体组成的不同位置的延迟荧光发光体上。光谱学、晶体学、和理论计算。在苯基咔唑单元上具有溴原子的发光体比在其他位置上具有溴原子的发光体具有更好的 PL 性能，并且在有机发光二极管中作为发射器有效地表现，提供高达 28.6% 的高外部量子效率和小效率滚动-关闭。在这项工作中获得的结构-性能关系可以为进一步设计高效发光材料提供指导。

更新日期：2022-02-12

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