Efficient radiative cooling emitter adopting the wavelength conversion of giant CdSe/ZnS core-shell nanocrystals

S. Son, S. Jeon, J. H. Bae, S. Y. Lee, D. Chae, J. Y. Chae, T. Paik, H. Lee, S. J. Oh

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


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.

Original languageEnglish
Article number100496
JournalMaterials Today Physics
Publication statusPublished - 2021 Nov

Bibliographical note

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


  • CdSe/ZnS
  • Daytime radiative cooling
  • Giant core-shell
  • Photoluminescence quantum yield
  • Wavelength conversion

ASJC Scopus subject areas

  • General Materials Science
  • Energy (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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