Broadband Radiative Cooling and Decoration for Passively Dissipated Portable Electronic Devices by Aperiodic Photonic Multilayers. Issue 5 (23rd April 2020)

• Record Type: Journal Article
• Authors: Wu, Jiaye; Chen, Yuxuan
• Is Part Of: Annalen der Physik. Volume 532:Issue 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-04-23
• Subjects: electronic devices -- genetic algorithms -- optical thin films -- photonic multilayers -- radiative cooling; Physics -- Periodicals; Chemistry -- Periodicals; 530.05
• DOI: 10.1002/andp.202000001
• Languages: English
• ISSNs: 0003-3804

Abstract

Abstract: 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. Abstract : Broadband radiative cooling and decoration for passively dissipated portable electronic devices by aperiodic multilayers is proposed. The designed cooler yields a net cooling power of 46.88 W m −2 at 20 °C and 239.55 W m −2 at 90 °C. Its color shifts from translucent gray to reflective silver. These results are useful in exterior and thermal design of portable electronic devices.