中国物理B ›› 2026, Vol. 35 ›› Issue (6): 64208-064208.doi: 10.1088/1674-1056/ae266f

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Tunable color display and efficient thermal regulation with grating colored radiative cooler

Chunzhen Fan(范春珍)†, Cong Ren(任聪), and Hengli Xie(谢恒立)   

  1. Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou 450001, China
  • 收稿日期:2025-09-02 修回日期:2025-10-29 接受日期:2025-12-02 发布日期:2026-06-18
  • 通讯作者: Chunzhen Fan E-mail:chunzhen@zzu.edu.cn
  • 基金资助:
    This work was supported by the Optoelectronic Information Detection and Application Engineering Research Center of Henan Province.

Tunable color display and efficient thermal regulation with grating colored radiative cooler

Chunzhen Fan(范春珍)†, Cong Ren(任聪), and Hengli Xie(谢恒立)   

  1. Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou 450001, China
  • Received:2025-09-02 Revised:2025-10-29 Accepted:2025-12-02 Published:2026-06-18
  • Contact: Chunzhen Fan E-mail:chunzhen@zzu.edu.cn
  • Supported by:
    This work was supported by the Optoelectronic Information Detection and Application Engineering Research Center of Henan Province.

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摘要： Integrating color display with radiative cooling is of great importance for applications in both aesthetic appeal and thermal management. However, current colored radiative coolers primarily rely on geometric modulation, resulting in monochromatic color and limiting their applicability. Here, we present a tunable colored radiative cooler (GCRC) comprising an upper grating emitter and a lower grating reflector. The emitter achieves a high average emissivity of 98.8% and 86.5% within the first and second atmospheric transparency windows simultaneously, and it demonstrates angular-insensitive emissivity ($> 70%$) across 0-90$^\circ$ incident angle. Meanwhile, the grating reflector enables dynamic color manipulation through variations in polarization angle, dielectric layer thickness, and grating filling fraction. Notably, the GCRC demonstrates a maximum net nighttime cooling power of 232.08 W$\cdot$m$^{-2}$ at 300 K, and it reaches up to 74.6 W$\cdot$m$^{-2}$ under solar irradiation. Thus, our design not only delivers vibrant, adjustable color but also outperforms conventional radiative coolers in terms of cooling efficiency, making it a promising solution for architectural coatings, smart aesthetics, and advanced thermal management systems.

关键词: grating, radiative cooling, color display, emitter, reflector

Abstract: Integrating color display with radiative cooling is of great importance for applications in both aesthetic appeal and thermal management. However, current colored radiative coolers primarily rely on geometric modulation, resulting in monochromatic color and limiting their applicability. Here, we present a tunable colored radiative cooler (GCRC) comprising an upper grating emitter and a lower grating reflector. The emitter achieves a high average emissivity of 98.8% and 86.5% within the first and second atmospheric transparency windows simultaneously, and it demonstrates angular-insensitive emissivity ($> 70%$) across 0-90$^\circ$ incident angle. Meanwhile, the grating reflector enables dynamic color manipulation through variations in polarization angle, dielectric layer thickness, and grating filling fraction. Notably, the GCRC demonstrates a maximum net nighttime cooling power of 232.08 W$\cdot$m$^{-2}$ at 300 K, and it reaches up to 74.6 W$\cdot$m$^{-2}$ under solar irradiation. Thus, our design not only delivers vibrant, adjustable color but also outperforms conventional radiative coolers in terms of cooling efficiency, making it a promising solution for architectural coatings, smart aesthetics, and advanced thermal management systems.

Key words: grating, radiative cooling, color display, emitter, reflector

中图分类号:  (Polarization)

  • 42.25.Ja
78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 44.40.+a (Thermal radiation)