Spectral Compensation Strategy for Radical‐Induced Dye Degradation in Liquid Crystal Polymer Composites

ABSTRACT

Radical species generated during UV curing induce degradation of conventional dichroic dyes in photopolymerized liquid crystal polymer composites (LCPCs), severely limiting their optical stability and device lifetime. A compensation‐based materials strategy is introduced to decouple dye functionality from radical‐rich photopolymerization environments by incorporating a photochromic liquid crystalline dye, DTCP‐BIPH‐OC8 (DTCP‐LC), into black dye‐doped LC systems. Unlike conventional dichroic dyes, DTCP‐LC undergoes a reversible open–closed ring transformation and exhibits intrinsic resistance to radical‐induced degradation, thereby maintaining stable absorption in the red spectral region during UV curing. Through spectral overlap, DTCP‐LC compensates for degradation‐induced absorption loss of the commercial black dye M1012, preserving broadband optical attenuation. This hybrid dye strategy is validated in both polymer‐dispersed and polymer‐network liquid crystal architectures. The resulting hybrid devices exhibit voltage‐dependent modulation between opaque and transparent states, high haze, and stable switching performance, without altering the established fabrication process. This study presents a photochemically robust dye‐integration strategy for scalable photopolymerized photonic composites and establishes a general materials design strategy for protecting functional chromophores in radical‐mediated manufacturing processes.