Photoluminescent-assisted hierarchical metafabric sunshade for high-efficient passive cooling

High-rise buildings and electric vehicles in high solar irradiation regions consume amounts of energy for climate control, posing a significant challenge to global sustainability. The primary obstacle lies in integrating zero-energy, efficient cooling solutions without compromising comfort. As urbanization intensifies, innovative solutions must balance environmental impact with functionality. We propose a holistic strategy featuring photoluminescent-assisted hierarchical metafabric sunshade for post-glass spectral regulation. This material leverages to achieve a 95.8% emissivity in the mid-infrared (MIR) band and 94.3% reflectivity in the solar band. These particles efficiently convert absorbed ultraviolet (UV) light into visible light with an absolute quantum yield of 16.4%, significantly boosting cooling performance beyond traditional passive radiative materials. In real-world testing, the metafabric sunshade achieved a temperature reduction of 17.8°C and 14.4°C compared to the vehicles with blank and commercial sunshade, respectively. These results suggest that photoluminescent-enhanced metafabrics represent a sustainable, energy-saving pathway for cooling high-rise infrastructure and transportation, offering a scalable solution to mitigate urban heat islands and advance global sustainability goals.