物理化学学报 >> 2025, Vol. 41 >> Issue (1): 100006.doi: 10.3866/PKU.WHXB202309042

所属专题: 新型光电功能材料

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多重共振TADF分子的设计策略

张泽华, 于海涛*(), 祁彦宇*()   

  1. 河北师范大学化学与材料科学学院, 河北省有机功能分子重点实验室, 石家庄 050024
  • 收稿日期:2023-09-27 修回日期:2023-11-07 录用日期:2023-11-09 发布日期:2023-12-25
  • 通讯作者: Email: haitaoyu@hebtu.edu.cn (于海涛)hbsdqyy@hebtu.edu.cn (祁彦宇)
  • 基金资助:
    国家自然科学基金(21971054); 国家自然科学基金(22002092); 河北省省级科技计划(B2022205014); 河北省省级科技计划(22567622H); 河北省教育厅科学研究项目(BJK2023014); 河北省博士后科研择优资助项目(B2023005008); 石家庄市科学技术研究与发展计划项目(241791047A); 河北师范大学科技类基金(L2022B12); 河北师范大学科技类基金(L2023T01)

Design Strategy for Thermally Activated Delayed Fluorescence Materials with Multiple Resonance Effect

Zehua Zhang, Haitao Yu*(), Yanyu Qi*()   

  1. Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, China
  • Received:2023-09-27 Revised:2023-11-07 Accepted:2023-11-09 Published:2023-12-25
  • Contact: Email: haitaoyu@hebtu.edu.cn (Haitao Yu)hbsdqyy@hebtu.edu.cn (Yanyu Qi)
  • Supported by:
    the National Natural Science Foundation of China(21971054); the National Natural Science Foundation of China(22002092); S&T Program of Hebei(B2022205014); S&T Program of Hebei(22567622H); Science Research Project of Hebei Education Department(BJK2023014); Postdoctoral Research Projects Merit-based Funding Programs of Hebei Province(B2023005008); Shijiazhuang Science and Technology Research and Development Program(241791047A); the Science Foundation of Hebei Normal University(L2022B12); the Science Foundation of Hebei Normal University(L2023T01)

摘要:

自首例多重共振热激活延迟荧光(Multiple resonance thermal activation delayed fluorescence,MR-TADF)分子报道至今,其表现出的窄带发射、高发光量子效率等特性在有机电子学,尤其是有机发光二极管(Organic light-emitting diode,OLED)等领域引发了持续的研究热度,迅速成为重点研究对象,并涌现出了众多性能出色的分子和高性能器件。以MR-TADF分子为发光层的器件不断刷新人们对OLED的认知,其中一些采用了超荧光技术所制备的器件性能代表了当今某些光色领域OLED性能的最高值。随着人们对超高分辨率显示器需求的与日俱增,国际电信联盟(ITU)宣布了下一代色域标准,即BT.2020。此标准建立了最宽的显示色域标准,要求单色的原色波长为467、532和630 nm,这个色域非常宽。同时,在如此之宽的色域上实现高分辨率的显示,对器件基元色纯度的要求达到了可谓史无前例的严格。因此,它为显示技术树立了一个具有极大挑战难度的色纯度目标。鉴于以往传统荧光材料难以担当此攻关重任,故而BT.2020的出现给予了MR-TADF分子新的发展机遇,并在很大程度上使得该领域愈发火热起来。近年来,随着大量的研究与实践,MR-TADF分子家族得到了飞速的发展,然而大家讨论和归纳的重点基本都集中在领域整体的发展方面,专门针对分子设计策略所展开的讨论和总结依旧较少,不足以为刚涉足该领域的科研人员提供足够的参考。因此,本文从X-π-X原则,快反向系间窜越过程,窄带发射与高振子强度等方面,阐述了近三年来所报道的MR-TADF分子的设计思路,并对未来可能的设计方向进行了展望,例如将一些不同于传统MR-TADF分子的结构引入这一领域。最后,对今后MR-TADF领域的发展和产业化提出建议。

关键词: 多重共振热激活延迟荧光, 有机发光二极管, 有机光电功能材料, 电致发光, 荧光

Abstract:

Since the initial report on multiple resonance thermally activated delayed fluorescence (MR-TADF) molecules, their narrow band emissions, high quantum yields and other characteristics have consistently fueled research interest in the realm of organic electronics, particularly organic light emitting diodes (OLED). These molecules swiftly ascended to the forefront of research, serving as a pivotal focus, giving rise to numerous high-performance devices and meticulously crafted molecules. Devices featuring MR-TADF molecules as the luminescent core continually redefine our comprehension of OLED, with some employing hyperfluorescence technology attaining peak performance in specific photochromic domains today. Presently, with the escalating demand for ultra-high-resolution displays, the international telecommunication union (ITU) has unveiled the next generation color gamut standard, BT.2020. This standard delineates the broadest display color gamut, mandating monochromatic primary color wavelengths of 467, 532, and 630 nm, constituting an exceptionally extensive color gamut. Simultaneously, achieving high-resolution displays with such an expansive color gamut imposes unprecedentedly stringent requirements on the color purity of device elements. Consequently, it imposes a formidable color purity target for display technology. In the past, traditional fluorescent materials struggled to meet these demands. The advent of BT.2020, however, has presented new opportunities for the advancement of MR-TADF molecules, leading to a surge in popularity in this field. In recent years, with copious research and practical applications, the MR-TADF molecular family has undergone rapid evolution. Nevertheless, discussions and summaries primarily centered on the field's development, with limited focus on molecular design strategies. This deficiency hinders adequate reference for researchers entering the field. Consequently, this article expounds upon the design principles of select MR-TADF molecules reported in the past three years. It delves into aspects such as the X-π-X principle, fast reverse intersystem crossing processes, narrow-band emission, and high oscillator strength. Additionally, it posits future design directions, including the incorporation of non-traditional structures into the MR-TADF domain. Finally, the article offers suggestions for the prospective development and industrialization of the MR-TADF field.

Key words: Multiple resonance thermal activateddelayed fluorescence, Organic light-emitting diode, Organic optoelectronic functional materials, Electroluminescence, Fluorescence