Fluorescent Dye-Doped Brightening Polymer-Stabilized Bistable Cholesteric Liquid Crystal Films

Abstract

Brightening polymer-stabilized bistable cholesteric liquid crystal (PSBCLC) films with doped fluorescent dyes were prepared using the polymerization-induced phase separation (PIPS) method. The transmittance performance behavior of these films in both states (focal conic and planar) and absorbance change in multiple dye concentrations were studied using a UV/VIS/NIR spectrophotometer. The change occurring in dye dispersion morphology with different concentrations was obtained by means of the polarizing optical microscope. The maximum fluorescence intensity of different dye-doped PSBCLC films was measured using a fluorescence spectrophotometer. Moreover, the contrast ratios and driving voltages of these films were calculated and recorded to demonstrate film performance. Finally, the optimal concentration of dye-doped PSBCLC films with a high contrast ratio and a relatively low drive voltage was found. This is expected to have great potential applications in cholesteric liquid crystal reflective displays.

Light and Humidity Dual-Responsive Anti-Counterfeiting Films Based on Hydrogen-Bonded Cholesteric Liquid Crystal Polymers with Spiropyran

“…Recent years have witnessed a surge of interest in the anti-counterfeiting model that marries structural and fluorescent colors . In the research by the Yao group, they unveiled a dual-mode anti-counterfeiting coating, fusing fluorescent dyes with liquid crystal polymers.…”

“…Recent years have witnessed a surge of interest in the anticounterfeiting model 17 that marries structural 18 and fluorescent colors. 19 In the research by the Yao 20 nonchiral dyes with cholesteric liquid crystals, offering precise control over circularly polarized luminescence (CPL) intensity. Duan et al 22 innovatively merged fluorescent dyes with bluephase liquid crystals, intensifying the vibrancy of the coating's colors.…”