多共振荧光发射体的结构多样性和通用性综述:oled的进展、挑战和展望

IF 55.8 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Xiugang Wu, Songqian Ni, Chih-Hsing Wang, Weiguo Zhu, Pi-Tai Chou
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引用次数: 0

摘要

具有多共振效应的荧光发射体已成为研究热点。这些MR发射体主要由含硼/氮、氮/羰基和吲哚咔唑框架的多环芳烃组成。最高已占据分子轨道和最低未占据分子轨道的交错排列有利于MR,导致更小的内部重组能和更窄的发射带宽。最佳电荷分离抑制单线态和三重态激发态之间的能量间隙,有利于热激活延迟荧光(TADF)。这些MR-TADF材料,由于其颜色纯度和高发射效率,是有机发光二极管的优秀候选者。然而,重大挑战依然存在;特别是,交替核心配置所施加的限制阻碍了它们的多样性和通用性。大多数现有的MR-TADF材料集中在蓝绿色光谱范围内,只有少数在红色和近红外光谱中。这篇综述提供了一个及时和全面的筛选磁共振发射器从他们的开创性工作到现在。我们的目标是从基本和高级两个角度了解MR-TADF结构-性能关系。重点探讨了化学结构、光物理性质与电致发光性能之间的关系,以促进MR发光材料的未来发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs

Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs
Fluorescence emitters with a multiple-resonant (MR) effect have become a research hotspot. These MR emitters mainly consist of polycyclic aromatic hydrocarbons with boron/nitrogen, nitrogen/carbonyl, and indolocarbazole frameworks. The staggered arrangement of the highest occupied molecular orbital and the lowest unoccupied molecular orbital facilitates MR, resulting in smaller internal reorganization energy and a narrower emission bandwidth. Optimal charge separation suppresses the energy gap between singlet and triplet excited states, favoring thermally activated delayed fluorescence (TADF). These MR-TADF materials, due to color purity and high emission efficiency, are excellent candidates for organic light-emitting diodes. Nevertheless, significant challenges remain; in particular, the limitation imposed by the alternated core configuration hinders their diversity and versatility. Most existing MR-TADF materials are concentrated in the blue-green range, with only a few in red and near-infrared spectra. This review provides a timely and comprehensive screening of MR emitters from their pioneering work to the present. Our goal is to gain understandings of the MR-TADF structure–performance relationship from both basic and advanced perspectives. Special emphasis is placed on exploring the correlations between chemical structure, photophysical properties and electroluminescent performance in both depth and breadth with an aim to promote the future development of MR emitters.
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来源期刊
Chemical Reviews
Chemical Reviews 化学-化学综合
CiteScore
106.00
自引率
1.10%
发文量
278
审稿时长
4.3 months
期刊介绍: Chemical Reviews is a highly regarded and highest-ranked journal covering the general topic of chemistry. Its mission is to provide comprehensive, authoritative, critical, and readable reviews of important recent research in organic, inorganic, physical, analytical, theoretical, and biological chemistry. Since 1985, Chemical Reviews has also published periodic thematic issues that focus on a single theme or direction of emerging research.
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