TY - JOUR
T1 - Efficient radiative cooling emitter adopting the wavelength conversion of giant CdSe/ZnS core-shell nanocrystals
AU - Son, S.
AU - Jeon, S.
AU - Bae, J. H.
AU - Lee, S. Y.
AU - Chae, D.
AU - Chae, J. Y.
AU - Paik, T.
AU - Lee, H.
AU - Oh, S. J.
N1 - Funding Information:
The Creative Materials Discovery Program supported this research through the National Research Foundation of Korea (NRF) , funded by the Ministry of Science and ICT ( NRF-2018M3D1A1058972 , NRF-2018M3D1A1059001 ). The Technology Innovation Program funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) ( N0002310 , 20000887 ). This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT) ( 2020R1A2C3006382 ).
Publisher Copyright:
© 2021
PY - 2021/11
Y1 - 2021/11
N2 - 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 μm) and maximize the emissivity in the atmospheric transmittance window (8–13 μm). 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 °C on average from outdoor measurements. Thus, a wavelength conversion strategy was confirmed for efficient daytime radiative cooling.
AB - 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 μm) and maximize the emissivity in the atmospheric transmittance window (8–13 μm). 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 °C on average from outdoor measurements. Thus, a wavelength conversion strategy was confirmed for efficient daytime radiative cooling.
KW - CdSe/ZnS
KW - Daytime radiative cooling
KW - Giant core-shell
KW - Photoluminescence quantum yield
KW - Wavelength conversion
UR - http://www.scopus.com/inward/record.url?scp=85111981630&partnerID=8YFLogxK
U2 - 10.1016/j.mtphys.2021.100496
DO - 10.1016/j.mtphys.2021.100496
M3 - Article
AN - SCOPUS:85111981630
VL - 21
JO - Materials Today Physics
JF - Materials Today Physics
SN - 2542-5293
M1 - 100496
ER -