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Achieving passive daytime radiative cooling requires cooling coatings to have both high solar reflection and large infrared radiation, which minimize heat gain and simultaneously maximize heat dissipation. Conventional polymer coatings with commercially available TiO2 nanoparticles can passively cool down buildings, but the cooling effect is limited by the UV absorption of TiO2. In address this issue, we introduce fluorescent pigments into commercially available white coatings to compete with TiO2 on UV absorption and re-emit part of the absorbed UV light as fluorescence in the visible range (Advanced Materials 2020, 32(42), 1906751; Journal of Materials Chemistry A 2022, 10(37), 19635-19640). This not only reduces the net heat gain from solar irradiation but also makes the cooling coatings colourful (EcoMat 2022, 4(2), e12169), thereby promoting large-scale applications of the passive daytime radiative cooling technology for combating global warming and energy crisis and enabling effective heat management in wearable electronics and miniaturized optoelectronics (Science Advances 2023, 9(14), eadg1837).
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