热致延迟荧光（TADF）有机分子近年来成为有机电致发光材料研究领域中新的热点，但其器件在高电荷密度下普遍存在严重的激子-激子淬灭问题。本项目拟设计合成一种新型的给受体型TADF金属配合物，利用配位金属的重原子效应来加快反系间窜越速率，进一步缩短TADF的寿命，以期解决其激子-激子淬灭问题。首先通过给受体推拉电子能力的调节等方式，对有机配体的热致延迟荧光性质进行调控，然后引入不同种类的廉价金属原子形成金属配合物，研究给受体型金属配合物的TADF性质，揭示金属重原子的引入对TADF的反系间窜越过程及其发射寿命的影响规律。最后对配合物的电致发光性能进行表征，阐明给受体型金属配合物的材料结构-TADF性质-电致发光性能之间的关系，为设计合成高效稳定低成本的电致发光材料提供理论基础和实验依据。

Organic electroluminescent materials with thermally activated delayed fluorescence (TADF) have become a hot research area in organic light-emitting diodes during recent years, but they usually suffered from serious exciton-exciton quenching effect under high current density in devices. Aimed to solve this problem, new-concept donor-acceptor-type metal-complex was designed and synthesized in order to achieve a short-lifetime TADF through a way of accelerating the reverse inter-system crossing (RISC) rate under the assistant of heavy atom effect. Firstly, donor-acceptor organic ligands with TADF are obtained by the adjustment of the relative electron-withdraw ability of donor and acceptor moieties. Then different cheap metal atoms are introduced into the ligands to form the donor-acceptor-type metal-complex, and their TADF properties will be fully investigated, with the influence of metal atom on the RISC process and TADF lifetime to be revealed. Finally, the electroluminescence properties of metal complex will be characterized, and the relationships between the structure, TADF property and electroluminescence performance of donor-acceptor-type metal complex will be explored, to provide theoretical basis and experimental data for improving organic electroluminescent materials with high and stable performance as well as low cost.