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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Updated: Apr 30, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Dual-Functional Photonic Metacoating Integrating Fluorescence Thermometry and High-Performance Space Radiative

Hao Gong1, Zhongyang Wang2, Yan Zheng1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.

Nano-Micro Letters
|April 29, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel metacoating for spacecraft, combining efficient radiative cooling with sensitive fluorescence thermometry. The material offers reliable temperature sensing and reduced solar heating for improved thermal management.

Keywords:
Eu-doped ZrO2 submicrosphereFluorescence thermometryPhotonic metacoatingSpace radiative cooling

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Aerospace Engineering

Background:

  • Spacecraft thermal management requires non-contact temperature sensing and efficient radiative cooling.
  • Balancing high thermometric sensitivity with reduced solar heating is a significant challenge.

Purpose of the Study:

  • To develop a dual-functional metacoating for spacecraft that integrates efficient radiative cooling and high-sensitivity fluorescence thermometry.
  • To address the trade-off between thermometric response and solar heating through material-structure co-design.

Main Methods:

  • Photonic-structure optimization using a constrained-gradient optimizer and grid-search mapping.
  • Bandgap-driven compositional optimization for Europium (Eu) doping in ZrO2 submicrosphere metacoating.
  • Characterization of solar absorptance, thermal emittance, cooling power, and thermometric performance.

Main Results:

  • Optimized metacoating achieved ultralow solar absorptance (αs = 0.076) and high thermal emittance (ε = 0.931).
  • Demonstrated net cooling power of 323.69 W m⁻² and a 77 °C temperature reduction.
  • Achieved high relative temperature sensing sensitivity (0.797% K⁻¹) over 173–433 K.
  • Exhibited excellent irradiation resistance against proton, electron, atomic oxygen, and UV exposure.

Conclusions:

  • The developed Eu-doped ZrO2 metacoating successfully integrates space radiative cooling and fluorescence thermometry.
  • This dual-functional platform offers a promising solution for intelligent spacecraft thermal management.
  • The metacoating demonstrates superior performance and durability compared to existing technologies.