基于稠环BODIPY的近红外纯有机室温磷光材料的合成与性能研究

室温磷光(RTP)材料广泛用于生物成像、OLED、防伪等领域。其中，纯有机RTP材料由于易修饰、低毒性等优点，具有更好的应用前景。目前研究的纯有机RTP材料大多发射波长较短，近红外型纯有机RTP材料鲜有报道。芳香稠环BODIPY具有大共轭体系，在长波长区光谱响应性能突出，有望构建近红外型纯有机RTP材料，但此类分子合成较为困难。基于此，本项目创新性地利用独特的砜基BODIPY卤化物为母体，与二苯乙烯发生[4+2]环加成反应，再通过氧化芳构化，即可简便合成芳香稠环BODIPY分子，再引入三聚氰酸形成磷光体。然后与烷基取代的三聚氰胺或芳香二甲酸混合，利用分子间氢键形成的刚性网络以及长烷基链的协同作用，有效降低非辐射跃迁以及接触氧气造成的磷光猝灭，得到近红外型纯有机RTP材料。总结共轭骨架、卤素种类与数目、氢键网络形状与磷光发射性能的关系，理清调控机制，发展系列高性能的近红外型纯有机RTP材料。

Room temperature phosphorescence (RTP) materials can be used in bioimaging, OLED, anti-counterfeiting, and other fields. Pure organic RTP materials have better applications due to their advantages of easy modification, low toxicity, etc. Many reported pure organic RTP materials exhibit short-wavelength emission and seldom emit in the near-infrared (NIR) regions. Aromatic ring fused BODIPY, featured with a larger conjugation system and excellent near-infrared absorption, are very promising pure organic phosphors to emit in the NIR region. However, such molecules are not easily prepared. Therefore, this project innovatively proposed a [4+2] cycloaddition strategy based on sulfoleno-BODIPY halides and stilbene derivatives, followed by in situ oxidation to afford the aromatic ring-fused BODIPYs with NIR emission. Subsequently, the introduction of cyanuric acids on the molecule will give the aromatic ring fused BODIPY phosphor, which will be mixed with alkyl-modified melamines or aromatic di-acid. The synergistic effect of intermolecular hydrogen bond networks and long alkyl chains will effectively reduce the non-radiative transition and the phosphorescence quenching caused by exposure to oxygen. As a result, pure organic RTP materials with NIR emission based on aromatic ring fused BODIPY will be obtained. The effects of the BODIPY conjugation skeleton, the type and number of halogens, or the H-bonds network on the RTP emission of the materials will be studied. Finally, the project will develop high-quality pure organic RTP materials with NIR emission.