Broadband Radiative Cooling and Decoration for Passively Dissipated Portable Electronic Devices by Aperiodic Photonic Multilayers,Annalen Der Physik

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Broadband Radiative Cooling and Decoration for Passively Dissipated Portable Electronic Devices by Aperiodic Photonic Multilayers
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-04-23 , DOI: 10.1002/andp.202000001
Jiaye Wu ₁ , Yuxuan Chen ₂

Affiliation

Broadband radiative cooling and decoration for passively dissipated portable electronic devices by an aperiodic photonic multilayer structure is proposed theoretically. The designed optical structure can strongly emit in the infrared region from 6.9 to 40 µm within the blackbody radiation spectrum of electronic devices. Its emission spectrum exhibits good uniformity across different incident angles, enhancing the cooling performance. At an ambient temperature of 20 °C, the designed broadband radiative cooler can produce a net cooling power of 46.88 W m⁻², 65.95% higher than pure silica of the same thickness. At a typical junction temperature of 90 °C allowed by the microprocessor die, the net cooling power reaches 239.55 W m⁻², still with an 18.21% improvement over pure silica glass. In the visible regime, the designed structure displays a low uniformity in the reflection spectrum, producing an elegant color shift from the translucent gray color of normal direction to the silver and highly reflective look at a grazing angle. These results can be useful in future exterior and thermal designs of portable electronic devices.

中文翻译：

非周期性光子多层对被动耗散便携式电子设备的宽带辐射冷却和装饰

理论上提出了一种非周期性光子多层结构的无源便携式电子设备的宽带辐射散热和装饰技术。设计的光学结构可以在电子设备的黑体辐射光谱内的6.9至40 µm的红外区域强烈发射光。它的发射光谱在不同的入射角上显示出良好的均匀性，从而增强了冷却性能。在20°C的环境温度下，设计的宽带辐射冷却器可产生46.88 W m ^-2的净冷却功率，比相同厚度的纯二氧化硅高65.95％。在微处理器裸片允许的典型结温为90°C的情况下，净冷却功率达到239.55 W m ^-2，仍然比纯石英玻璃提高了18.21％。在可见状态下，设计的结构在反射光谱中显示出较低的均匀性，从而产生从法线方向的半透明灰色到银色的优雅色移，并在掠射角产生高反射效果。这些结果对于将来便携式电子设备的外观和散热设计很有用。

更新日期：2020-04-23

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