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

• Published in: Molecules (Basel, Switzerland) Vol. 28; no. 8; p. 3509
• Main Authors: Zhao, Yuzhen, Li, Chaonian, Lang, Tingting, Sun, Yitian, Li, Qingbo, Shi, Xinli, Yao, Ruijuan, Zhang, Huimin, Zhao, Yang
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.04.2023; MDPI
• Subjects: bistable cholesteric liquid crystal; brightening film; Dielectric properties; Dyes; Energy consumption; Fluorescence; high contrast ratio; LCDs; Light; Liquid crystal displays; Morphology; Optical properties; organic fluorescent dyes; Polymer industry; Polymerization; Polymers; Ratios; China; bistable cholesteric liquid crystal; high contrast ratio; organic fluorescent dyes; brightening film
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules28083509

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.