화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.582, No.1, 21-33, 2013
Electrically Induced Multicolored Hyper-Reflection and Bistable Switching from a Polymer-Dispersed Cholesteric Liquid Crystal and a Templated Helical Polymer
In this study, a special bistable polymer-dispersed cholesteric liquid crystal (PDCLC) with two different reflection modes was fabricated by refilling a PDCLCs composites into a template helical polymer with the same or opposite helical structure, in which the templated helical polymer with a half of the cell thickness was fabricated by nonuniform photopolymerization of monomers induced by ultraviolet light absorbing dye in the cholesteric liquid crystal (Ch-LCs) mixture. Modulation of a hyper-reflective state (>50% reflection) and normal-reflective state (50% reflection) at a fixed wavelength, even switching between bicolor reflection with different handedness can be achieved. Additionally, a patterned multicolored switchable Ch-LCs film can be achieved by infiltrating the above PDCLCs into a patterned templated helical polymer, and the switching behavior of the patterned film was exhibited. These special optical properties make the novel Ch-LCs composites an interest for great potential application in many fields such as flexible display, optical components, LCs lasing, etc.