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Photoluminescence: Applications01:14

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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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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Highly Efficient and Environmentally Stable Radiative Cooling Fabric: Integrating Photoluminescence and Hierarchical

Hongtao Liu1,2, Hui Li3, Yining Wang1

  • 1Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University (BUAA), Beijing, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

Researchers developed a durable, multi-layer polymer fabric for radiative cooling. This advanced material achieves significant sub-ambient cooling and offers enhanced weatherability and mechanical strength for building and personal thermal management.

Keywords:
UV‐resistantenvironmental stabilityhierarchical core–shell architecturephotoluminescenceradiative cooling

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Polymer-based radiative coolers offer flexibility for zero-energy heat management.
  • Current materials require improved cooling performance, weatherability, mechanical robustness, and anti-fouling properties for outdoor use.

Purpose of the Study:

  • To develop a scalable, durable radiative cooling polymer fabric with enhanced performance for building and personal thermal management.

Main Methods:

  • Fabrication of a multi-layer polymer fabric using a hierarchical core-shell architecture and photoluminescent material integration.
  • Incorporation of photon-manipulating photoluminescence, stable chemical bonds, and multi-scale TiO2 nanoparticles.
  • Evaluation of optical properties (solar reflectivity, mid-infrared emissivity) and cooling performance under simulated solar intensity.

Main Results:

  • Achieved high effective solar reflectivity (101.1%) and average mid-infrared emissivity (95.34%).
  • Demonstrated maximum daytime sub-ambient cooling of 10.0°C with a cooling power of 83.78 W·m⁻².
  • Exhibited superior mechanical robustness (8.7 MPa tensile strength), UV resistance, anti-fouling properties, and flame retardancy.

Conclusions:

  • The developed multi-layer core-shell radiative cooling fabric (Mc-sRCF) shows significant potential for energy-efficient building cooling and personal thermal management.
  • The fabric's enhanced durability and performance make it suitable for demanding outdoor applications.
  • This work presents a promising pathway for advanced, weather-resilient radiative cooling materials.