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Updated: Jun 8, 2026

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

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Surface temperature imaging below 300 K using La(2)O(2)S:Eu.

R H Krauss, R G Hellier, J C McDaniel

|October 12, 2010

Summary

This study demonstrates surface temperature imaging using lanthanum oxysulfide europium phosphor coatings. This method achieves 1 K temperature resolution for visible light imaging with CCD cameras.

Area of Science:

Materials Science
Optical Physics
Thermometry

Background:

Accurate surface temperature measurement is crucial in various scientific and industrial applications.
Existing thermometry methods may have limitations in resolution, range, or applicability to specific materials.
Luminescent materials offer potential for non-contact temperature sensing.

Purpose of the Study:

To demonstrate a novel method for surface temperature imaging using a europium-doped lanthanum oxysulfide phosphor.
To evaluate the performance of this phosphor-based thermometry in terms of temperature resolution and range.
To enable temperature imaging using standard Charge-Coupled Device (CCD) cameras.

Main Methods:

Utilizing the ratio of visible emissions from the (5)D(2) and (5)D(1) energy levels of Eu3+ ions in a La(2)O(2)S:Eu phosphor coating.

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Developing an imaging system that employs standard CCD cameras to capture the phosphor emissions.

Calibrating the system to correlate emission ratios with surface temperature.

Main Results:

Successful generation of surface temperature images based on the phosphor's luminescence.
Achieved a temperature resolution of 1 Kelvin (K).
Demonstrated functionality over a temperature range of 193 K to 293 K (-80 °C to 20 °C).

Conclusions:

Lanthanum oxysulfide: europium phosphor coatings are effective for non-contact surface temperature imaging.
The developed method provides high temperature resolution using conventional CCD imaging technology.
This technique offers a promising approach for temperature monitoring in diverse environments.