Radiative cooling, a process in which the Earth maintains a near-constant temperature despite significant solar flux, is a promising technology with no requirement of any input energy for sub-ambient cooling as well as no emission of greenhouse gas. Here, we demonstrate a paint-format microparticle–polymer composite with a low fabrication cost, simple structure, and high radiative cooling performance. Harnessing intrinsic optical properties of aluminum oxide and silicon oxide particles with large energy bandgaps and complementary IR emission properties within the atmospheric transparency window, the proposed radiative cooling paint has an extremely low solar absorptivity of 0.032 and strong IR emission of 0.935 in the atmospheric transparency window. Furthermore, many outdoor measurements proved the RC paint provided high-performance radiative cooling effect for comparison with commercial white paint even in hot summer season detrimental for daytime raditaive cooling, enabling the practical use of radiative cooling.

辐射冷却是一种有前途的技术，它不需要任何输入能量即可进行低于环境的冷却，也无需排放温室气体，而辐射冷却是一种尽管有很大的太阳通量，但地球仍保持接近恒定温度的过程。在这里，我们演示了一种涂料格式的微粒-聚合物复合材料，具有较低的制造成本，简单的结构和较高的散热性能。利用在大气透明窗口内具有大能带隙和互补的IR发射特性的氧化铝和氧化硅颗粒的固有光学特性，拟议的辐射冷却涂料在大气透明窗口内具有极低的0.032的太阳吸收率和0.935的强IR发射率。此外，