Efficient radiative cooling emitter adopting the wavelength conversion of giant CdSe/ZnS core-shell nanocrystals
- Authors
- Son, S.; Jeon, S.; Bae, J. H.; Lee, S. Y.; Chae, D.; Chae, J-Y; Paik, T.; Lee, H.; Oh, S. J.
- Issue Date
- 11월-2021
- Publisher
- ELSEVIER
- Keywords
- CdSe/ZnS; Daytime radiative cooling; Giant core-shell; Photoluminescence quantum yield; Wavelength conversion
- Citation
- MATERIALS TODAY PHYSICS, v.21
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS TODAY PHYSICS
- Volume
- 21
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135896
- DOI
- 10.1016/j.mtphys.2021.100496
- ISSN
- 2542-5293
- Abstract
- Daytime radiative cooling is an eco-friendly, temperature-cooling mechanism that uses the inherent properties of a material without energy consumption. To realize a high daytime radiative cooling ability, it is necessary to minimize light absorption in the solar spectrum (0.3-2.5 mu m) and maximize the emissivity in the atmospheric transmittance window (8-13 mu m). Currently, the solar reflective layer of a radiative cooling material has the limitation of absorbing UV light, which can reduce the cooling performance. We attempted to solve this problem via UV-to-visible wavelength conversion using CdSe/ZnS giant core-shell structures. By applying this strategy, a wavelength conversion-type radiative cooling emitter (WC-RCE) was fabricated using "giant" CdSe/ZnS core-shell nanocrystals embedded into a polymeric membrane to establish minimized absorption within the UV and short-visible regions, which constitute up to 17.28% of the total solar spectrum. The applied g-NCs have a high photoluminescence quantum yield and a large Stokes shift, and can resolve the absorption in reflective layers, such as silver, by re-emitting the wavelength of the absorbed UV rays into the visible region. Compared with a conventional RCE, the WC-RCE achieves further cooling by 0.38 degrees C on average from outdoor measurements. Thus, a wavelength conversion strategy was confirmed for efficient daytime radiative cooling. (C) 2021 Published by Elsevier Ltd.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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