Colored, Daytime Radiative Coolers with Thin‐Film Resonators for Aesthetic Purposes,Advanced Optical Materials

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Colored, Daytime Radiative Coolers with Thin‐Film Resonators for Aesthetic Purposes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-08-27 , DOI: 10.1002/adom.201800707
Gil Ju Lee ₁ , Yeong Jae Kim ₁ , Hyun Myung Kim ₁ , Young Jin Yoo ₁ , Young Min Song ₁

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Recently developed approaches in passive radiative cooling enable daytime cooling via engineered photonic structure layouts. However, the use of these daytime radiative coolers is restricted owing to their nonaesthetic appearance resulted from strong solar reflection. Therefore, this article introduces a colored passive radiative cooler (CPRC) capable of generating potential cooling power, based on a thin‐film optical resonator embedded in an efficient thermal emission structure. This CPRC not only selectively emits infrared wave through the atmospheric transparency window but also displays subtractive primary colors to exhibit the desired appearance. Theoretical analysis and systematic experiments prove the possibility of subambient cooling via CPRC by lowering the temperature to 3.9 °C below the ambient air in the daylight. This is the first example of coloring radiative cooler by photonic structures. Successful demonstration of cooling/coloring behavior with wearable electronic devices under solar irradiation represents a major step forward in the field of temperature‐sensitive, flexible, wearable electronic/optoelectronic devices.

中文翻译：

带有彩色共鸣器的彩色日间散热冷却器，用于审美用途

被动辐射冷却的最新开发方法可通过工程光子结构布局实现日间冷却。但是，由于日照辐射冷却器由于强烈的太阳反射而具有非美学外观，因此受到限制。因此，本文基于嵌入高效散热结构中的薄膜光学谐振器，介绍了一种能够产生潜在冷却功率的有色无源辐射冷却器（CPRC）。该CPRC不仅通过大气透明窗口选择性地发出红外波，而且还显示减色原色以显示所需的外观。理论分析和系统实验证明，通过在白天将温度降低到低于周围空气3.9°C，可以通过CPRC进行环境冷却。这是通过光子结构为辐射冷却器着色的第一个示例。在太阳辐射下，可穿戴电子设备成功演示了冷却/着色行为，这是在温度敏感，柔性，可穿戴电子/光电设备领域迈出的重要一步。

更新日期：2018-08-27

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