Daytime radiative cooling has become a promising passive cooling technique in recent years, showing great potential in building-related applications to reduce the power consumption of air conditioning. Currently used mid-infrared emitters mainly rely on phonons in crystals, molecular vibrations in polymers (which have limited tunability) and other sophisticated photonic and plasmonic structures (which rely on expensive techniques). In this work, we propose the use of doped semiconductor nanoparticles as selective emitters, whose infrared optical properties can be readily tuned using the doping concentrations. The theoretical simulation shows that wide bandgap semiconductors with a bandgap greater than 3.5 eV can suppress solar absorption effectively. The plasma frequency f p should be approximately 2400 cm −1 to have enhanced emissivity in the atmospheric window for nanoparticles embedded in a medium with electric permittivity of 2.3. The complex refr...

中文翻译：

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掺杂的半导体纳米颗粒可能在白天的辐射冷却应用中

近年来，白天辐射冷却已成为一种很有前途的被动冷却技术，在与建筑相关的应用中显示出巨大的潜力，可以降低空调的能耗。当前使用的中红外发射器主要依赖于晶体中的声子，聚合物中的分子振动（具有有限的可调谐性）以及其他复杂的光子和等离子体结构（依赖于昂贵的技术）。在这项工作中，我们建议使用掺杂的半导体纳米粒子作为选择性发射器，可以使用掺杂浓度轻松调节其红外光学性能。理论仿真表明，带隙大于3.5 eV的宽带隙半导体可以有效抑制太阳吸收。对于嵌入在介电常数为2.3的介质中的纳米颗粒，等离子体频率fp应该约为2400 cm -1，以在大气窗口中具有增强的发射率。复杂的...