A Janus Smart Window for Temperature-Adaptive Radiative Cooling and Adjustable Solar Transmittance

• DOI: 10.1007/s40820-025-01740-1
• Publication Date: 2025-04-27T01:36:24Z
• Authors: Zuowei Zhang; Meina Yu; Cong Ma; Longxiang He; Xian He; Baohua Yuan; Luoning Zhang; Cheng Zou; Yanzi Gao; Huai Yang
• Keywords: Infrared window; Radiative Cooling

Abstract The advancement of sophisticated smart windows exhibiting superior thermoregulation capabilities in both solar spectrum and long-wave infrared range maintains a prominent objective for researchers this field. In study, Janus window is proposed prepared based on polymer-stabilized liquid–crystal films/thermochromic materials. It can achieve switchable front emissivity ( ε Front ) modulation ability (Δ T sol through dynamic flipping, making it suitable different seasonal energy-saving requirements. Outdoor experiments show that under daytime illumination, the indoor temperature decreases by 8 °C, nighttime drops 5 °C. MATLAB simulation calculations indicate cooling power 93 W m −2 , while reaches 142 . Interestingly, modifying conductive layer, effectively shield electromagnetic radiation (within X-band frequency (8.2–12.4) GHz). Energy reveals substantial superiority device energy savings compared with single-layer liquid crystal, poly(N-isopropyl acrylamide), normal glass when applied climate zones. This research presents compelling opportunity development characterized exceptional capabilities.