Optical properties of broadband reflection of cholesteric liquid crystal by thermal diffusion of benzotriazoles

Polymer stabilized cholesteric liquid crystal broadband reflective films are prepared by the thermal diffusion of a benzotriazoles organic ultraviolet (UV) absorber (UV-327) combined with photopolymerization. Agradient of UV intensity is established in the direction of film thickness, inducing the formation of a pitch gradient distribution, thus broadening the reflected bandwidth. The effects of UV-327 concentration, UV irradiation intensity, irradiation time, polymerization temperature, and C6M concentration on the reflected bandwidth of the sample are examined in detail. The results indicate that the diffusion method of the organic UV absorber enables the reflected bandwidth to be broadened under appropriate conditions. (C) 2022 Optica Publishing Group

Automated summary

Polymer stabilized cholesteric liquid crystal broadband reflective films are prepared using the thermal diffusion of an organic UV absorber combined with photopolymerization. The diffusion method of the UV absorber enables the broadening of the reflected bandwidth under appropriate conditions.