新型颜色可调谐的纯有机单组分聚合物超长发光材料的设计、合成及性能研究

高性能的纯有机超长发光（UOL）单组分聚合物材料将给材料、生物、医学等领域带来重大技术变革。但受限于其单一的超长有机室温磷光（UORTP）工作机制，现有的单组分UOL聚合物的发光颜色尚不够丰富，发光寿命还需大幅延长。本项目针对上述问题，创新性地提出在现有的UORTP机制中，额外引入有机长余辉发光（OLPL）机制中的电荷分离和电荷复合过程，从而能在大幅延长其发光寿命的同时，赋予单组分UOL聚合物可理性调谐的发光颜色。为实现上述“UORTP + OLPL”的超长发光新机制，本项目还提出了一种超长热激活延迟荧光单分子化合物的新构建策略，从而能在其基础上，理性设计、开发出具有多种发光颜色的高性能单组分UOL聚合物，并深入研究其构效关系，探究UOL材料的超长发光机制。本项目的实施有望为UOL材料的开发提供新思路，为传感、生物成像及诊疗、光动力治疗等领域提供新材料，为UOL材料的构效关系提供新认识。

The development of high-performance purely organic ultra-long luminescence (UOL) single-component polymers will promote great technological innovations in material, biology and medicine sciences. Yet currently, single-component polymer UOL materials suffer from unrich luminescence color and unsatisfactory luminescence lifetime, which should be ascribed to their mere ultra-long organic room temperature phosphorescence (UORTP) working mechanism. In view of these problems, herein, we propose a novel working mechanism for UOL materials, i.e., the incorporation of extra charge separation and charge recombination processes, which are characteristic processes of organic long-persistent luminescence (OLPL) materials, into UORTP materials. By integrating the advantages of UORTP and OLPL mechanisms, single-component UOL polymers with significantly prolonged luminescence lifetime and enriched and tunable luminescence color might be developed. Moreover, due to the lack of currently available single- molecule ultra-long thermally activated delayed fluorescence (UL-TADF) luminogens, which is a key prerequisite for acquiring UOL materials based on this “UORTP + OLPL” working mechanism, herein, we also propose a novel construction strategy for single-molecule UL-TADF fluorophores to enable the successful development of high-performance color-tunable single-component UOL polymers. Furthermore, through in-depth studies on structure-properties correlations of these materials, the long luminescence mechanism of UOL materials might be unveiled. The implementation of this project is expected to provide new ideas for the development of UOL materials, to provide new materials for sensing, photodynamic therapy, and bio-imaging and diagnosis areas, and to gain new insight to the structure-properties correlations of UOL materials as well.