Enhancing multi-resonance thermally activated delayed fluorescence emission via through-space heavy-atom effect

IF 19.1 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Chem Pub Date : 2024-11-14 DOI:10.1016/j.chempr.2024.10.020

Qi Zheng, Yang-Kun Qu, Peng Zuo, Hai-Tian Yuan, Yue-Jian Yang, Yu-Chen Qiu, Liang-Sheng Liao, Dong-Ying Zhou, Zuo-Quan Jiang

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Abstract

Recent research has focused on the heavy-atom effect in organic luminescent materials, especially in multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters. Traditional strategies involve directly conjugating heavy atoms to the chromophore, which often broadens the emission spectrum. This study explores an unconventional approach using the through-space heavy-atom effect, positioning heavy-atom moieties with nonconjugated short-range interaction with the chromophore. This method successfully demonstrates the “intramolecular external heavy-atom effect” proposed in the 1970s in cutting-edge high-efficiency emissive materials. Comparative analysis of these emitters confirms the spatial heavy-atom effect, maintaining the spectroscopic properties of MR chromophore while significantly improving external quantum efficiency in organic light-emitting diodes (OLEDs). These emitters also mitigate efficiency roll-off, showcasing the potential of spatial interactions to enhance MR-TADF materials for OLED applications.

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通过穿透空间重原子效应增强多共振热激活延迟荧光发射

近期研究的重点是有机发光材料中的重原子效应，尤其是多共振热激活延迟荧光（MR-TADF）发射器中的重原子效应。传统的策略是将重原子直接与发色团共轭，这往往会扩大发射光谱。本研究探索了一种非常规方法，即利用穿透空间重原子效应，定位与发色团具有非共轭短程相互作用的重原子分子。这种方法成功地将 20 世纪 70 年代提出的 "分子内外部重原子效应 "应用到了最先进的高效发射材料中。对这些发射器的比较分析证实了空间重原子效应，在保持 MR 发色团光谱特性的同时，显著提高了有机发光二极管（OLED）的外部量子效率。这些发射器还减轻了效率衰减，展示了空间相互作用在增强 MR-TADF 材料在有机发光二极管应用中的潜力。

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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.