Comparative Analysis of Spectral Broadening Techniques for Optical Temperature Sensing in Yttrium Fluoride (YF<sub>3</sub>) Doped with Neodymium
In this work, YF<sub>3</sub>:Nd<sup>3+</sup> powder was synthesized using the microwave-assisted hydrothermal method at a low temperature (140 °C) and short synthesis time (1 h). The photoluminescence and optical temperature sensing properties of YF<sub>3</sub>:Nd...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/25/7/2324 |
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| Summary: | In this work, YF<sub>3</sub>:Nd<sup>3+</sup> powder was synthesized using the microwave-assisted hydrothermal method at a low temperature (140 °C) and short synthesis time (1 h). The photoluminescence and optical temperature sensing properties of YF<sub>3</sub>:Nd<sup>3+</sup> were examined using 800 nm laser excitation, focusing on the emission corresponding to the <sup>4</sup>F<sub>3/2</sub> → <sup>4</sup>I<sub>9/2</sub> transition of Nd<sup>3+</sup>. The performance of YF<sub>3</sub>:Nd<sup>3+</sup> as an optical temperature sensor was evaluated using the full width at half maximum (FWHM), band broadening at 30% of maximum intensity (Δλ<sub>30%</sub>), and valley-to-peak intensity ratio (VPR) techniques. All techniques demonstrated good repeatability and reproducibility. The best results were obtained using the VPR (V1/P1) method, which exhibited the highest relative sensitivity and the lowest temperature uncertainty, with values of 0.69 ± 0.02% K<sup>−1</sup> and 0.46 ± 0.09 K at 303 K, respectively. YF<sub>3</sub>:Nd<sup>3+</sup> shows promise as an optical temperature sensor operating entirely within the first biological window. |
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| ISSN: | 1424-8220 |