光响应胆甾相液晶（CLC）有望作为“光子墨水”构筑显示系统中的可调控颜色单元，突破双稳态“电子墨水”在电场模式下仅能显示单色图案的瓶颈，开发彩色反射型显示器和可擦写设备。然而，结构色在明场可见、暗场“失活”的短板限制了CLC的进一步应用。本项目将荧光性能引入CLC中，构建反射-荧光双重模式光响应CLC材料。项目拟设计制备不同结构的手性荧光分子开关和类液晶结构的荧光分子，并以此为材料基础分别采用两种方法开发荧光CLC体系，分析优化体系的荧光强度、液晶理化性质、反射波长调控范围等参数；深入研究反射波长的调控和荧光发光强度之间的关系，掌握反射模式和荧光模式相辅相成的有效途径；实现节能、护眼的反射模式（明场）和荧光模式（暗场）的不间断使用，满足对多功能材料日益增长的需求，为推动CLC在柔性显示、多级防伪和光学信息加密等领域的应用奠定基础。

Photoresponsive cholesteric liquid crystals (CLCs) may represent one of the most ideal candidates to construct active color units as ‘photonic ink’ and develop color reflective displays and rewritable devices, breaking the limitation of showing single color images caused by bistable E-ink. However, such CLC systems is restricted to the fact that the structural color can be seen in the light field and disappears in the dark field. In this project, a reflection-fluorescence dual-mode CLC system is constructed by introducing the fluorescence performance into the CLC materials. This project intends to design and prepare fluorescence chiral switches with different structures and fluorescence molecules of liquid-crystal-like structures. Based on these materials, two methods are used to prepare fluorescence CLCs. Parameters of the optimized system are analyzed, such as fluorescence intensity, physical and chemical properties of liquid crystals, and tuning range of the structural color. In order to master the effective ways in which reflection mode and fluorescence mode complement each other, the relationship between the tuning of reflection wavelength and the intensity of fluorescence emission will be carefully studied. In the light field, we can use the energy-saving and eye-protected reflection mode; while in the dark field, the system can continue to be used with the fluorescence mode, which expands the application of the CLC materials and meets the growing demand for multi-functional materials, laying the material foundation for the promotion of the CLCs in flexible display technology, multilevel security and optical information encryption.