Ion Substitution Strategy toward Spectral Tunability of Environmentally Friendly Rare Earth Sulfide Lattices for Radiative Cooling

Abstract

Radiation cooling technology can effectively reduce the energy transmission of the sun to the building during the day, thus playing a certain positive role in alleviating the urban heat island effect and reducing energy consumption. In this study, red Nd-doped γ-Ce 2 S 3 and orange La-doped γ-Ce 2 S 3 were prepared by the green synthesis method, and their morphologies and optical properties were systematically studied. The color film produced by mixing the prepared microcrystalline powder with poly(vinylidene fluoride-hexafluoro propylene) at a certain proportion has nearinfrared reflectivity and superior environmental resistance, achieving effective cooling of 3−6 °C when applied to the building surface. This study expands ideas for energy-efficient building materials and enriches the path to a carbon neutral sustainable future.

Synchronous Radiative Cooling and Thermal Insulation in SiO2/Poly(vinyl alcohol) Composite Aerogel for Energy Savings in Building Thermal Management

“…Therefore, seeking new cooling methods to relieve dependence on compression refrigeration technology is of great significance to the optimization of energy structure, in which radiative cooling technology has gradually become a hot spot of research in recent years. It provides an ecofriendly cooling strategy by reflecting sunlight in the solar wavelength band (0.3–2.5 μm) and emitting heat in the form of thermal radiation to the cold outer space (3 K) through the atmospheric-transparent window (8–13 μm). − Radiative cooling as a zero-energy passive cooling technology is effective in dealing with extreme hot weather; ,− however, most areas have large differences in ambient temperatures between day and night, and radiative cooling persists at night resulting in overcooling, which in turn increases the building’s heating energy consumption.…”

Yellow rare earth sulfide powders with near‐infrared reflectance and spectral modulation for energy‐saving applications

“…Therefore, the development of nontoxic, high infrared reflective pigments is of great significance to both the environment and human beings 17 . Rare earth sulfides are used as pigments with high infrared reflectivity and high color rendering properties due to their unique rare earth ions and suitable energy band structure 18,19 . Among them, γ‐Sm 2 S 3 exhibits a bright yellow color due to its S 2p to Sm 4f interatomic transition 20,21 .…”