Chinese invention patent: Method for controlling liquid crystal reflection color by using fluorine substituted azobenzene

Inventor: Yanlei Yu, Lang Qin, Jia Wei

Applicant: Fudan University

Patent No.: ZL 201810745175.3

Abstract：

The invention belongs to the technical field of liquid crystal materials, in particular to a method for controlling a liquid crystal reflection color by using fluorine substituted azobenzene. The fluorine substituted azobenzene used in the method has the characteristic of multi-wavelength light response, and the cis-trans isomerization reaction with different degrees of the fluorine substituted azobenzene can be carried out under the irradiation of different wavelength lights. According to the method, the fluorine substituted azobenzene, a chiral dopant and a liquid crystal matrix are evenly mixed in a certain proportion, and then the mixture is poured into a liquid crystal cell. By changing a wavelength of a stimulus light source, the precise regulation of the reflection color of the liquid crystal cell to be red, green and blue can be realized. The control method uses the light steady state to control the liquid crystal reflection color, and the limitation of a traditional method that the transition state is used to control the reflection color is broken through. The method can be applied to numerous fields, such as liquid crystal display, optical logic switch, optical storage, anti-counterfeiting, and the like.