中文摘要：

热活化延迟荧光（TADF）材料由于第一单线态（S1）与三线态激发态（T1）之间的能级差较小,使得三线态激子能够有效地系间窜越至单线态发光,实现100%的激子利用率,在有机发光二极管（OLED）等领域得到广泛应用,是目前有机电子学研究的热点之一。基于给-受体（D-A）结构构建TADF材料具有分子设计简便、易于制备、性能优异等特点,引起了人们的普遍关注。本文综述了基于D-A结构设计TADF材料的基本原则,依据给受体构筑单元的不同,概括了各类TADF材料的结构和性能特点以及在器件应用等方面的最新研究进展,最后总结了D-A结构型TADF材料尚存在的问题,并对其未来的关键研究方向进行了分析和展望。

英文摘要：

Thermally activated delayed fluorescence（ TADF） materials,capable of efficient reverse intersystem crossing（ RISC） from the lowest triplet excited state（ T1） to the lowest singlet excited state（ S1） to use triplet excitons for photoluminescence with theoretically 100% exciton harvesting in emission,have attracted great attention in recent research of organic electronics, especially in the field of organic light emitting diodes（ OLEDs）. The singlet-triplet energy splitting（ ΔEST） between S1 and T1should be low,which is a key point to facilitate the RISC process in tuning triplet excitons to singlet excitons for delayed fluorescence emission. With the significant advantages of convenient molecular design,easy preparation,rich optoelectronic properties,and excellent device performance,TADF materials with donor-acceptor（ D-A） molecular structures are of central importance in the current development of high-performance TADF molecules. In this article,we review the basicmolecular design principles of the D-A type TADF materials and summarize their molecular structure characteristics,optoelectronic properties and device application performance in the latest research progress,according to the varied types of acceptor building blocks. Finally,the existing problems,future opportunities and key challenges of TADF materials with D-A architectures are discussed to give a full view of this kind of new organic optoelectronic materials.