3D-Helical Artificial Chromatophore for Thermally Tunable Fluorescence and Stealth Switching.

) enables differential photoreactivity to ultraviolet-visible (UV-vis) light and forms the basis for rapid and reversible chromatic transitions. When exposed to an external thermal impulse, the artificial chromatophore─measuring 1400 μm in thickness (outer diameter, OD)─can rotate up to 309°, exhibit a negative strain of 84.6%, and reach a maximum average actuation velocity rate of 297.4 μm/s/°C (Spring Index, SI: 4.6). This performance is among the fastest reported for color-tunable materials. Notably, the system's thermally induced color change is effective not only in air but also in completely different environments, maintaining its performance underwater despite the high thermal conductivity of water. Such an approach is expected to broaden the application of adaptive materials in diverse industries, including space and deep-sea sensors, military stealth and adaptive camouflage, temperature-regulating smart textiles for nighttime use, and smart ocean buoys.