Infrared shielding achieved by the bilayer broadband reflective film possessing the PSCLC-PVA-PSCLC structure

The bilayer broadband reflective films with a PSCLC-PVA-PSCLC structure were achieved by stacking two monolayer polymer-stabilized cholesteric liquid crystal (PSCLC) films with different reflection centers. Ultraviolet (UV) light irradiation in the thickness direction of the broadband reflective film induced an intensity gradient, leading to a pitch gradient distribution. By fine-tuning the substance ratios and polymerization conditions, the performance of the bilayer broadband reflective film was significantly optimized. Under the optimal conditions, the reflective bandwidth (Δλ) of the bilayer film was expanded by approximately 80 % compared to the original sample. The preparation of these bilayer broadband reflective films demonstrates significant potential for applications in the field of anti-infrared devices, owing to their excellent infrared (IR) shielding effect.