PhotoniX, Volume. 4, Issue 1, 25(2023)

Thin film-based colorful radiative cooler using diffuse reflection for color display

Junren Wen1, Xiao Chen2, Zeyu Zhu1, Yining Zhu2, Hao Luo2, Yusi Wang2, Yujie Liu2, Hailan Wang2, Wenjia Yuan2, Yueguang Zhang2, Chenying Yang1,2、*,*, and Weidong Shen2
Author Affiliations
  • 1Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, Hangzhou 310024, China
  • 2State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Department of Optical Engineering, Hangzhou 310027, China
  • show less

    Colorful radiative coolers (CRCs) can be widely applied for energy sustainability especially and meet aesthetic purposes simultaneously. Here, we propose a high-efficiency CRC based on thin film stacks and engineered diffuse reflection unit, which brings out 7.1 °C temperature difference compared with ambient under ~ 700 W·m-2 solar irradiation. Different from analogous schemes, the proposed CRCs produce vivid colors by diffuse reflection and rest of the incident light is specular-reflected without being absorbed. Adopting the structure of TiO2/SiO2 multilayer stack, the nanophotonic radiative cooler shows extra low absorption across the solar radiation waveband. Significant radiative cooling performance can be achieved with the emissivity reaching 95.6% in the atmosphere transparent window (8–13 μm). Moreover, such CRC can be fabricated on flexible substrates, facilitating various applications such as the thermal management of cars or wearables. In conclusion, this work demonstrates a new approach for color display with negligible solar radiation absorption and paves the way for prominent radiative cooling.

    Tools

    Get Citation

    Copy Citation Text

    Junren Wen, Xiao Chen, Zeyu Zhu, Yining Zhu, Hao Luo, Yusi Wang, Yujie Liu, Hailan Wang, Wenjia Yuan, Yueguang Zhang, Chenying Yang, Weidong Shen. Thin film-based colorful radiative cooler using diffuse reflection for color display[J]. PhotoniX, 2023, 4(1): 25

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category: Research Articles

    Received: Jan. 23, 2023

    Accepted: Aug. 2, 2023

    Published Online: Sep. 18, 2023

    The Author Email: Yang Chenying (adongszju@hotmail.com)

    DOI:10.1186/s43074-023-00104-5

    Topics

    Please enter the answer below before you can view the full text.
    8-6=
    Submit