构筑具备圆偏振发光性质的共价有机框架材料

Recently, circularly polarized luminescent (CPL) materials are of increasing attention due to their potential applications in 3D displays, optical data storage, chiroptical devices and so on. However, most of the reported CPL materials suffer from low luminescence intensity and small dissymmetry factor (glum), which limited their wide application. In this project, we will start from the structure design and property tuning, utilize covalent organic framework (COFs) as the research platform, incorporating chiral group and luminescent chromophore into the backbones of COFs to construct CPL-active COFs by two different strategies. It is envisioned that the quantum yields of the designed COFs will enhance due to the restriction of intramolecular rotations of building blocks, and the dissymmetry factor will amplify through the efficient delivery charity by the π conjugated aromatic groups, thus we will obtain CPL-active COFs with both high luminescence intensity and large glum value. In addition, we will thoroughly investigate the influence of organic building blocks, topological structures, stacking structures and connected groups on the chirality, luminescent efficiency and CPL performance. This study will not only expand the amounts and application areas of COFs, but also provide a new strategy on the design and synthesis of CPL-active materials.

近年来，圆偏振发光材料在3D显示、量子通信和光学器件等方面表现出良好的应用前景，受到越来越多的关注。然而文献已报道的一些圆偏振发光材料存在着发光效率差、不对称因子低等问题，限制了其广泛应用。本项目拟从结构设计与性能调控出发，以共价有机框架材料（Covalent Organic Frameworks, COFs）作为研究平台，通过两种不同策略将手性基团和发光基团同时引入到COFs中，构筑具有圆偏振发光特性的COFs材料。希望利用COFs骨架结构限制分子转动增强发光效率的同时，通过π共轭芳香基团有效传递手性，提高不对称因子，进而得到高发光效率和高不对称因子的圆偏振发光COFs材料。在此过程中，阐明有机结构单元、拓扑学类型、堆积方式、连接基元等因素对手性、发光效率、圆偏振发光性能等的影响。该研究不仅拓宽了COFs的种类和应用领域，并为设计合成具有优异性能的圆偏振发光材料提供了全新的研究思路。

共价有机框架材料（COFs）作为一类新型的具有周期性结构排列的有机多孔聚合物，能够实现在原子尺度上对框架结构精准调控。我们从结构设计与性能调控出，成功合成多例新型COFs材料，以其作为研究平台，系统探究了COFs的构筑单元种类、成键方式、堆积方式以及拓扑学结构对其光催化性能的影响，准确认知构效关系。与此同时，我们以金属团簇为节点，引入光、电聚合组装的策略，构筑一系列新型高性能催化剂。上述研究为新型COFs催化剂的制备提供了一些理论借鉴和实验指导。