荧光磷光共发射材料的合成及其在白光器件中的应用

The white organic light-emitting diodes (WOLEDs) have drawn increasing attention due to their great application in full-color displays and solid-state lighting. During the past two decades, various approaches for improving WOLEDs have been developed including not only device architecture optimization but also organic materials system updating. However, up until now, the emission of fluorescent materials, the phosphorescent materials and the thermally activated delayed fluorescent materials are all from one excited state, either the singlet or triplet excited state. Therefore, a combination of using both singlet and triplet excitons by design and synthesis novel fluorescent phosphorescent dual-emission materials is considered to be an ideal solution to approach high-efficiency WOLEDs. This project targets on solving the bottleneck problem of low photoelectric conversion efficiency and complex fabrication technology on WOLEDs. By using the basic principle of photochemical, photophysical and device physics, we plan to design and synthesize a series of novel fluorescent-phosphorescent dual-emission materials. Importantly, the device performance of WOLEDs will be tested by using these new fluorescent-phosphorescent dual-emission materials. In this investigation, we envision to reveal the inherent relationship between the molecular structure and property in order to provide a useful strategy for novel fluorescent-phosphorescent dual-emission materials synthesis. Meanwhile, this investigation is anticipated to make a contribution to the settlement of key scientific problems on WOLEDs.

由于白色有机电致发光器件(White OLED)在全彩显示和固态照明方面具有的巨大应用前景, 长期以来受到人们的广泛关注。经过将近二十年的研发，其性能不断提高，除了器件结构的不断优化外，选择恰当的有机材料对实现高效率白光至关重要。迄今为止，荧光材料、磷光材料及热激活延迟荧光材料均是来自单一激发态，设计合成荧光磷光共发射材料是实现单线态、三线态激子同时完全利用的新途径，也是白光OLED的创新尝试。本项目针对白色有机电致发光器件中光电转换效率低、制备工艺复杂等瓶颈问题，利用光化学、光物理基本原理，结合器件物理及结构的基本知识，设计、合成具有新型结构的荧光磷光共发射材料，并对其相应白光器件性能进行详细的研究，了解材料分子结构与性能的关系，为更有效地设计该类材料提供必要的理论指导，同时，也为解决白光OLED 器件中的关键科学问题做出贡献。

本课题在国家自然科学基金委青年人才项目【《荧光磷光共发射材料的合成及其在白光器件中的应用》（61605158）】的支持下，2017至2019年度的科学研究工作基本上依照项目计划逐步实施，着重探索了热激活延迟荧光型硫杂蒽酮材料在低效率滚降磷光器件中的应用、螺萘酮衍生物的制备及在红色磷光器件和热激活延迟荧光器件中的应用研究；与此同时，我们还积极拓宽了研究领域，与本单位催化领域的研究小组合作开展了多项科学研究工作，在二价钯催化的碳氢键活化/去芳构[3+2]螺环化反应、零价钯催化的三组分[2+2+1]螺环化反应、碳氢键活化/芳环去芳构化反应策略等方面取得了较好的研究成果。截止目前，项目主持人作为第一作者，在Angew. Chem. Int. Ed., Org. Chem. Front., Org. Electron., Org. Biomol. Chem., Chi. Chem. Lett.等国际权威期刊上合作发表SCI研究论文5篇；申请有机光电材料应用方面的发明专利一篇。