Jiang Qian, Ruan Huan, Sun Chenchen, Wang Tian, Zhang Yuping, Qiu Yuan, Wang Hong, Liao Yonggui, Xie Xiaolin
Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
National Anticounterfeit Engineering Research Center, Huazhong University of Science and Technology, Wuhan, 430074, China.
Macromol Rapid Commun. 2023 Apr;44(7):e2200915. doi: 10.1002/marc.202200915. Epub 2023 Feb 3.
Bright structural color derived from the unique helical superstructure of cholesteric liquid crystals (CLCs) has attracted much attention. In addition, fluorescence color is an intrinsic emission upon excitation, which can be observed often under UV light. However, it is a challenge to combine the fluorescence and structural colors to construct a self-supporting system at the same time. In this work, a photoresponsive cyanostilbene-based gelator (CSpy-C10) is synthesized, which emits blue fluorescence in LC. CSpy-C10 can gel LCs and further construct thermo-/photoresponsive CLC physical gels. The structural color of the CLCs, fluorescence, and mechanical properties of the gels can be independently regulated due to the separation of the chiral unit and photoresponsive unit with aggregation-induced emission behavior. Finally, the reversible information encryption including writing and erasing based on the changes in fluorescence are explored. This kind of two-color material can be applied in the fields ranging from information encryption, fluorescent display to high-tech anticounterfeiting.
源自胆甾相液晶（CLC）独特螺旋超结构的明亮结构色备受关注。此外，荧光色是激发后的固有发射，在紫外光下经常可以观察到。然而，同时将荧光和结构色结合以构建一个自支撑体系是一项挑战。在这项工作中，合成了一种基于光响应性氰基二苯乙烯的凝胶剂（CSpy-C10），它在液晶中发射蓝色荧光。CSpy-C10可以使液晶凝胶化，并进一步构建热/光响应性CLC物理凝胶。由于手性单元和具有聚集诱导发光行为的光响应单元的分离，CLC的结构色、荧光以及凝胶的机械性能可以独立调节。最后，探索了基于荧光变化的包括写入和擦除的可逆信息加密。这种双色材料可应用于从信息加密、荧光显示到高科技防伪等领域。
