COF/手性稀土杂化材料的制备及圆偏振荧光研究

圆偏振荧光(CPL)材料由于在信息存储、手性传感、3D显示和光电器件领域的广阔应用前景正展现出其他发光材料所不具备的独特优势。作为光学材料，其在固态下能否表现出良好的性能是材料能否实用化的关键。非常遗憾的是在手性分子基CPL材料中由于分子的无序聚集，导致聚集体中分子跃迁偶极矩取向平均化，因此，很少有固态的CPL现象被观察到。本项目拟利用具有规整孔道结构的共价有机框架（COF）聚合物作为主体材料与手性稀土配合物通过杂化的方式构筑基于共价有机框架的新型手性稀土杂化材料。其中手性稀土配合物作为CPL的发光中心，COF框架作为主体材料封装发光中心，使发光分子达到类似于在溶液状态下溶剂对分子的溶剂化作用，使其最大程度阻断分子间的相互作用，保持材料的CPL活性。本项目将围绕大孔径晶相COF的合成、手性螺旋稀土配合物的合成、杂化材料的组装与材料在固态下圆偏振光性能之间的关系展开研究。

Circularly polarized luminescence (CPL) materials are receiving a large attention due to their potential applications in optical storage, chiral probes, 3D displays and photoelectric device. As an optical material, its performance in solid state is the key to the real application of the material. Unfortunately, due to the disordered aggregation of molecules in chiral molecular-based CPL materials, the dipole orientation of molecular transition in aggregates is homogenized. Therefore, only few CPL emissions in solid state have been observed. In this project, a novel chiral rare earth hybrid material based on covalent organic framework (COF) polymer with regular pore structure and chiral rare earth complexes will be constructed by hybrid method. The chiral rare earth complexes act as the luminescent centers of CPL, and the COF framework is used as the bulk material to encapsulate the luminescent centers, so that the luminescent molecules can be isolated in “house” to realize the status similar to solvation effect of molecule in solvents. Thus, the intermolecular interaction will be blocked to the maximum extent and the CPL activity of the material would be maintained. This project will focus on the synthesis of large pore crystalline phase COF, the synthesis of chiral helical rare earth complexes, the assembly of hybrid materials and the properties of circularly polarized luminescence in solid state.