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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Related Experiment Video

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Scalable All-Polymer Photonic Crystals for Daytime Radiative Cooling.

Guiying Yu1, Haoran Wang1, Weiyouran Hong1

  • 1National Key Laboratory of Advanced Polymer Materials, Sichuan Provincial Engineering Research Center of Plastic/Rubber Complex Processing Technology, Polymer Research Institute of Sichuan University, Sichuan University, Chengdu, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 29, 2025
PubMed
Summary

Researchers developed a scalable all-polymer photonic crystal film for passive daytime radiative cooling (PDRC). This durable material achieves significant cooling performance, overcoming previous limitations in polymer-based solutions.

Keywords:
all‐polymer photonic crystalgradient nanolayer coextrusionmechanical robustnesspassive daytime radiative coolingscalable fabrication

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Area of Science:

  • Nanophotonics
  • Materials Science
  • Sustainable Energy

Background:

  • Photonic crystals offer potential for passive daytime radiative cooling (PDRC).
  • Existing all-polymer photonic crystals (APPCs) face challenges in scalability, durability, and performance due to low refractive index contrast and fabrication difficulties.
  • Interfacial delamination and insufficient mechanical robustness limit current APPC applications.

Purpose of the Study:

  • To develop a scalable, high-performance all-polymer photonic crystal film for efficient PDRC.
  • To overcome the limitations of existing APPCs, including refractive index contrast, layer fabrication, and mechanical properties.
  • To establish a practical fabrication route for durable, high-performance polymeric cooling films.

Main Methods:

  • Fabrication of a 1500-layer hierarchical architecture using self-assembled gradient nanolayer coextrusion of poly(methyl methacrylate) and poly(ethylene naphthalate).
  • Application of biaxial stretching to enhance material properties.
  • Characterization of optical properties (solar reflectance, mid-infrared emissivity) and mechanical properties (tensile strength, toughness, Young's modulus).

Main Results:

  • Achieved high solar reflectance (95.4%) and mid-infrared emissivity (93.4%).
  • Demonstrated significant sub-ambient cooling of 11°C under 980 W/m² solar irradiance.
  • Exhibited exceptional mechanical properties: tensile strength of ~103.8 mPa, toughness of ~54.9 mJ/m³, and Young's modulus of ~2.9 GPa.
  • The fabrication process was solvent-free and continuous, enabling industrial-scale manufacturing.

Conclusions:

  • The developed all-polymer photonic crystal film offers a scalable and durable solution for passive daytime radiative cooling.
  • The material surpasses existing polymer-based radiative coolers in both cooling performance and mechanical robustness.
  • This work presents a practical fabrication route bridging nanophotonic design with industrial manufacturing for advanced cooling films.