有效促进三线态激子反系间窜越（RISC）到单线态发光，是获取高激子利用率电致荧光器件的重要途径，但目前兼具高RISC速率和高发光效率的材料体系有限。本项目在分析借鉴国内外最新相关研究成果和申请人实验探索基础上，首次提出构筑以吩噻嗪为电子给体（D）、噁二唑或咪唑为电子受体（A）的多个系列D–A型共轭有机荧光分子，希望通过多维多尺度系统变化给体和/或受体强度、给体-受体单元之间共轭桥和相对扭曲程度、以及共轭骨架对称性等途径，强化和调控分子内电荷转移效应和前线分子轨道定域分离特性，创建有利于RISC的错位能级、电子组态和态间能隙，探索促进RISC速率的新途径，开发新型高激子利用效率共轭有机电致荧光材料体系，制备和研究它们掺杂和非掺杂电致发光器件性能，建立分子结构与发光性质之间的关系，推动新原理发光材料与器件发展。

High exciton population in the emitting states is a crucial factor for highly efficient organic light-emitting diodes (OLED), and transferring triplet excitons to singlet through reverse intersystem crossing (RISC) could improve OLED’s efficiency. However, organic luminogens with both high RISC rate and high fluorescence efficiency are still rare at present. In this project, we have proposed to construct a series of novel donor–acceptor-type molecules with phenothiazine as the donor and oxadiazole or imidazole as the acceptor units, and their photo-physical and electroluminescence properties are investigated. The intramolecular charge transfer effects and the spatially separation characteristics of frontier molecular obitals have been enhanced and adjusted by changing the strength of donor and/or acceptor moieties, the spacing unit between donor and acceptor moieties, the distorted degree of molecular backbone, and the symmetry of conjugation skeleton. These systemically multi-dimensional and multi-scale changes in molecular structures are in favor of the investigation on the relationships between molecular structures and material properties and the development of novel conjugated organic luminogens with high EL performances benefited from RISC of triplet exciton population. This molecular design could adjust the energy gaps among excitation states and provide unique dislocation energy level and electronic configuration to facilitate RISC rate and find new RISC mechanism, which should promote the progress of new principle light-emitting materials and devices.