基于硼氮杂稠环芳烃的多重共振热活化延迟荧光材料研究进展  

Recent Advances in Multi-Resonance Thermally Activated Delayed Fluorescence Materials Based on B,N-Heteroarenes

作　　者：张祎 杜呈卓 李继坤[1] 王小野 Zhang Yi;Du Cheng-Zhuo;Li Ji-Kun;Wang Xiao-Ye(State Key Laboratory of Elemento-Organic Chemistry,College of Chemistry,Nankai University,Tianjin 300071)

机构地区：[1]南开大学化学学院元素有机化学国家重点实验室,天津300071

出　　处：《有机化学》2023年第5期1645-1690,共46页Chinese Journal of Organic Chemistry

基　　金：国家自然科学基金(Nos.22071120,92256304);国家重点研发计划(No.2022YFB4200600);中央高校基本科研业务费专项资金资助项目。

摘　　要：近年来,多重共振热活化延迟荧光(multi-resonance thermally activated delayed fluorescence,MR-TADF)材料由于其优异的光物理性质和电致发光器件性能而受到广泛关注.这类材料通常以稠环芳烃骨架为基础,通过引入具有相反共振效应的缺电子中心(如硼原子)和富电子中心(如氮原子),诱导最高占据分子轨道(HOMO)和最低未占分子轨道(LUMO)在分子骨架中分别定域在不同原子上,从而获得小的单线态-三线态能级差(ΔEST),实现TADF的性质.与传统的给受体型TADF材料相比,MR-TADF材料具有刚性结构和局域电荷转移特征,有利于获得高色纯度的窄谱带发光和极高的量子效率,使其成为理想的发光材料并广泛应用于有机发光二极管(organiclight-emittingdiode,OLED)中.自2016年首例基于硼氮杂稠环芳烃的MR-TADF材料被报道以来,该领域取得了飞速的发展,但尚缺乏针对材料分子研究进展的系统总结.综述了基于硼氮杂稠环芳烃的MR-TADF分子的设计策略和合成方法,从分子骨架的发展、分子骨架的取代基修饰策略以及新型手性MR-TADF材料三个方面,具体阐述了最新的研究进展,并展望了未来发展方向,期望进一步促进MR-TADF分子材料的发展与应用.In recent years,multi-resonance thermally activated delayed fluorescence(MR-TADF) materials have attracted wide attention because of their excellent photophysical properties and electroluminescent performance.By introducing electron-deficient and electron-rich centers(such as boron and nitrogen atoms) in the framework of polycyclic aromatic hydrocarbons(PAHs),the HOMO and LUMO can be separated on different atoms due to the opposite resonance effects,which can reduce the singlet-triplet energy gap(ΔEST) to achieve TADF properties.Compared with conventional donor-acceptor type TADF materials,MR-TADF materials have rigid skeletons and show short-range charge transfer characteristics,which are conducive to realizing narrowband luminescence with high color purity and high quantum efficiency,making them ideal luminescent materials and widely used in organic light-emitting diodes(OLEDs).Since the first report of MR-TADF materials based on B,N-heteroarenes in 2016,significant progress has been achieved in the development of new materials.However,a timely summary on this topic is still lacking.In this review,the design strategy and synthetic method of MR-TADF materials based on B,N-heteroarenes are summarized,and the recent advances in the development of new molecular skeletons,the backbone modification strategy to tune the properties,and a novel type of chiral MR-TADF materials are discussed.It is expected that the current review would further promote the development and application of MR-TADF materials in the future.

关 键 词：多重共振 热活化延迟荧光 有机发光二极管 硼氮杂稠环芳烃 窄谱带发光 

分 类 号：TN383.1[电子电信—物理电子学] TB34[一般工业技术—材料科学与工程]