A Multi‐Level Dynamic Bilayer <scp>PSCLC</scp> Smart Window Device With Spectrally Localized Infrared Modulation

ABSTRACT Conventional polymer stabilized cholesteric liquid crystal (PSCLC) smart windows often exhibit a high degree of global synchronicity and modulation mode singularity in spectral evolution. Here, a bilayer dual‐band reflective PSCLC device that enables a four‐stage optical modulation and independent regulation of specific infrared wavebands under varying driving voltages is reported. Infrared shielding and electro‐optical responsiveness are ensured by optimizing the thiol crosslinker TMPMP content and integrating an electrospun mat loaded with infrared‐absorbing Cs 0.33 WO 3 nanoparticles. Building upon the established foundational performance, a partially driven layer and a fully driven layer with distinct driving voltages are constructed and ultimately integrated into a bilayer device. The fabricated device features dual‐band selective reflection at 980 nm and 1450 nm, and the synergistic superposition of distinct optical states from the two individual layers under gradient voltages macroscopically demonstrates a non‐monotonic, four‐level optical response. Notably, the 1450 nm reflection band can be independently switched under applied voltages, completely without interfering with the reflection state at 980 nm. The multi‐level and independent optical control capabilities of the integrated device provide a versatile paradigm for advanced dynamic thermal management in next‐generation smart windows.