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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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CaSnO₃: Pr³⁺ phosphor for new application in temperature sensing.

Yufeng Hu¹, Fei Zhou¹, Xiuying Tian¹

¹Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

|August 23, 2020

Summary

This study explored a new calcium stannate (CaSnO₃) phosphor doped with praseodymium (Pr³⁺) for advanced temperature sensing. The material exhibits high sensitivity and potential for LED and emergency lighting applications.

Keywords:

Calcium stannate Long afterglow Optical thermometry Photoluminescence Praseodymium

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Area of Science:

Materials Science
Solid State Chemistry
Luminescence

Background:

Calcium stannate (CaSnO₃) is a perovskite material with potential applications in optoelectronics.
Praseodymium (Pr³⁺) doping is known to induce luminescence in various host materials.
Accurate temperature sensing using phosphors is crucial for many technological applications.

Purpose of the Study:

To investigate the potential of CaSnO₃: Pr³⁺ phosphor for temperature sensing applications.
To characterize the structural, optical, and luminescence properties of the synthesized phosphor.
To evaluate the temperature sensitivity and afterglow characteristics of the material.

Main Methods:

Synthesis of CaSnO₃: Pr³⁺ phosphor.
Structural characterization using X-ray diffraction (XRD).
Optical property analysis including luminescence spectra, chromaticity coordinates, and afterglow decay time.
Temperature-dependent luminescence measurements to determine sensitivity.

Main Results:

CaSnO₃: 0.3%Pr³⁺ exhibited a distorted orthorhombic perovskite structure with spherical particles (0.816 μm).
The phosphor showed greenish-blue emission with potential for LED and emergency lighting (average afterglow decay time of 60.2 s for 0.15%Pr³⁺).
CaSnO₃: 0.3%Pr³⁺ demonstrated a maximum relative temperature sensitivity of 7.57% K^-1 at 298 K, with a high relative sensitivity of 6722.76/T² K^-1.

Conclusions:

CaSnO₃: Pr³⁺ is a promising phosphor for high-performance temperature sensing.
The material's luminescence and long afterglow properties suggest applications in lighting.
The study proposed mechanisms for luminescence, afterglow, and thermal quenching, contributing to the understanding of Pr³⁺ doped phosphors.