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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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Scattering-Enhanced Light Extraction for Radiative Thermal Load Mitigation in Fluorescent Films.

Chenglong She¹, Yi Zhang¹, Minghao Dong¹

¹Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, 999077, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|September 15, 2025

Summary

This study introduces a novel light extraction strategy for fluorescent colorants, significantly improving cooling performance. By scattering nanoparticles, it overcomes light trapping, enhancing sub-ambient cooling efficiency for colored surfaces.

Keywords:

color fluorescence heat light extraction scattering

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Area of Science:

Materials Science
Optics
Thermodynamics

Background:

Traditional absorptive pigments cause solar heating.
Fluorescent colorants are limited by total internal reflection (TIR), trapping emitted photons.
This trapping increases parasitic solar absorption and radiative thermal load.

Purpose of the Study:

To develop a scattering-enhanced light extraction strategy for fluorescent films.
To overcome the TIR limit and reduce radiative thermal load.
To optimize nanoparticle concentration for maximum light extraction efficiency.

Main Methods:

Sequential quadratic programming optimization model for radiative thermal load.
Monte Carlo ray-tracing simulations for light extraction efficiency.
Outdoor experiments to validate temperature reduction.

Main Results:

Light extraction technology expands sub-ambient cooling chromaticity from 19.3% to 64.9%.
An optimal 0.5 wt% TiO2 nanoparticle concentration achieved 85.9% light extraction efficiency.
The 0.5 wt% TiO2 sample showed a 4.1°C temperature decrease compared to the control.

Conclusions:

Scattering-enhanced light extraction significantly boosts fluorescent color cooling performance.
The developed method is cost-effective and scalable compared to microtexturing.
This approach offers a promising solution for passive radiative cooling applications.