In this study, we fabricated easily applicable and processible colored passive daytime radiative cooling (PDRC) films using a solution process with colloidal nanoparticle-based inks. White PDRC films were prepared using hollow silica nanoparticle (H–SiO₂)-based colloidal inks and polymeric binders and spray coating. The films have an average reflectivity of 97.2% and emissivity of 94.3% and their temperature is 6.12 °C lower than the ambient temperature during the daytime at outdoor measurement. We also fabricated colored PDRC films by depositing Cu-based quantum dots (QDs) on white PDRC films. The Cu-based QDs partially absorb light in the visible spectrum, allowing yellow, red, and brown colors, that are highly efficient in preventing heat generation. The absorbed energy is converted into another wavelength and emitted as photons based on the photoluminescence effect. Based on the wavelength conversion, the yellow, red, and brown PDRC films can re-emit powers of 14.06, 28.36, and 43.92 W/m², respectively, resulting in the prevention of heating. The results of outdoor measurements confirm that the temperature of the yellow and red PDRC films decreases by 3.25 and 0.51 °C, respectively, compared with the ambient temperature. Furthermore, we numerically and experimentally determined the daytime cooling performance of two brown PDRC films with different quantum efficiencies. Our results confirm that these easily processable colored PDRC films are more efficient daytime cooling than commercial paint color films on various substrates.

在这项研究中，我们使用基于胶体纳米颗粒的墨水的溶液工艺制造了易于应用和加工的彩色被动日间辐射冷却 (PDRC) 薄膜。使用中空二氧化硅纳米颗粒（H-SiO ₂) 基胶体油墨和聚合物粘合剂和喷涂涂层。该薄膜的平均反射率为 97.2%，发射率为 94.3%，室外测量时其温度比白天的环境温度低 6.12°C。我们还通过在白色 PDRC 薄膜上沉积铜基量子点 (QD) 来制造彩色 PDRC 薄膜。Cu 基 QD 部分吸收可见光谱中的光，产生黄色、红色和棕色，这在防止热量产生方面非常有效。基于光致发光效应，吸收的能量被转换成另一种波长并作为光子发射。基于波长转换，黄色、红色和棕色PDRC薄膜的重发射功率分别为14.06、28.36和43.92 W/m ²，分别导致防止加热。室外测量结果证实，与环境温度相比，黄色和红色 PDRC 薄膜的温度分别降低了 3.25 和 0.51 °C。此外，我们通过数值和实验确定了两种具有不同量子效率的棕色 PDRC 薄膜的白天冷却性能。我们的结果证实，这些易于加工的彩色 PDRC 薄膜比各种基材上的商业油漆彩色薄膜更有效地白天冷却。