Colored Radiative Cooler under Optical Tamm Resonance

Abstract

We propose a colored radiative cooler assisted by optical Tamm resonance, which features the high-performance cooling effect and high-purity subtractive primary colors (CMY) simultaneously. By developing the design method and evaluation methodology for the colored radiative cooler, we accurately balance the conflict between the cooling effect and the color displaying. Compared with our designed conventional radiative cooler, the thermal emissivity of the colored radiative cooler in the atmospheric transparent window is remarkably enhanced after introducing the desired colors; moreover, only a steady-state temperature of ∼30% is sacrificed to enable the color displaying. Our results demonstrate that the cooling power densities of the radiative coolers with three subtractive primary colors at ambient temperature can reach about 44–52 W/m2, with their temperatures being reduced by 5–6 °C when hc = 6 W/m2/K. In addition, we also numerically analyze the angular performance and the effect of environmental situations on the cooling performance. The proposed colored radiative coolers show the potential applications in the temperature-sensitive electronic/optoelectronic devices and personal thermal management fields.