有机近紫外发光材料在新一代显示和照明器件等光电领域具有重要而特殊的意义，但这种宽带隙材料表现低和不平衡的载流子注入和迁移性，是制约其高效电致发光的一个关键问题。本项目拟利用具有几何和杂化特性的咔唑和富氮三唑等含氮杂环衍生物，首次设计合成一系列以联苯或芴为共轭桥的弱分子内电荷转移和强分子间相互作用D‒π‒A结构近紫外荧光分子。通过咔唑和三唑衍生物在联苯共轭桥上键接位置的变化以及外缘引入吡啶等基团，可以进一步调控和优化分子的构型、构象、能级水平和带隙，创建更有利于载流子注入与传输和发光效率的超分子相互作用和聚集态结构。研究它们的光学和电学性质、非掺杂器件电致发光性质及作为掺杂主体效能，建立材料结构与性能关系。本项目不仅发展了新型高效近紫外电致荧光材料和掺杂主体材料，而且对开发其它含氮杂环高效有机电致发光材料与器件具有重要的借鉴和指导意义。

Near-ultraviolet (NUV) electroluminescence (EL) could play a key role in reducing power consumption and expanding color gamut in full-color organic light-emitting diodes (OLED), but the construction of highly efficient NUV electroluminescence (EL) emitters was more difficult due to their low and unbalanced charge injection and carrier transport properties and the controlled molecular conjugation sizes. Combining weak donors and acceptors were commonly regarded as a solution strategy, however, few fluorescent EL emitters with both NUV emission and high/balanced charge-transport properties have been realized. We considered that the key to solve these problems was to strategically select donor (D) and acceptor (A) units and tactically link them. In this project, phenylcarbazoles and triaryltriazoles were rationally linked to form diverse D‒π‒A hybrids through biphenyl or fluorene bridges. The twisted conjugation backbones and weak intramolecular charge transfer contributed to the NUV emission, and the unique hybridized structures of the building blocks, together with the proper introduction of peripheral functional groups, the intermolecular interactions facilitating charge carrier injection and transporting could be constructed and enhanced. Overall, novel and efficient NUV EL emitters have been constructed, and the feasibility of research object has been evidenced by the experimental investigations.