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Bandwidth-based flexible optical fiber thermometry based on sharp line emission regulation of Cr3+ ions

基于调控Cr3+锐线发射带宽的柔性光纤温度传感器

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Abstract

We designed and fabricated a flexible optical fiber based on LiGa4(MgGe)0.5O8:Cr phosphors with temperature-dependent fluorescence characteristics. Specifically, the full width at half maximum (FWHM) of the emission band broadens with elevated temperature due to the increased electron–phonon interactions in the matrix. Moreover, the FWHM values subtly increase with the increase in the concentration of the [Mg2+–Ge4+] unit in LiGa4(MgGe)0.5O8:Cr, along with the increase in the external quantum efficiency from 24.8% to 50.0%. Furthermore, these phosphors exhibit excellent luminescence thermal resistance, with an outstanding absolute sensitivity of 7.51 cm−1 K−1 at 443 K and a good relative sensitivity of 0.64% K−1 at 303 K. Finally, a flexible all-fiber system is employed to monitor the real-time temperature of objects with excellent repeatability, precision, and stability. This work not only explores the promising application of Cr3+-doped luminescent materials with sharp emissions but also enriches the new routes of optical temperature measurement owing to the bandwidth characteristics.

摘要

我们设计并制备了一种基于LiGa4(MgGe)0.5O8:Cr荧光粉变温发光特性的柔性温度传感光纤. 通常来说, 随着温度的升高, 发光材料基质的电子–声子作用将加剧, 这会导致其发射峰的半高宽(FWHM)在升温时不断加宽. 在本工作中, 随着LiGa5−x(MgGe)xO8:Cr中[Mg2+–Ge4+]化学单元成分比例的增加, 荧光粉近红外发光的FWHM出现明显展宽, 其外量子效率也从24.8%增加到50.0%. 进一步研究发现, LiGa4-(MgGe)0.5O8:Cr纳米荧光粉的发光具有优异的热稳定性和温度传感特性, 在443 K时绝对灵敏度可达7.51 cm−1K−1, 303 K下相对灵敏度为0.64% K−1. 基于此, 我们搭建了具有可重复性、 高精度和优异稳定性的柔性全光纤系统, 并将其用于实时监测物体的温度. 本研究不仅探索了具有锐线发射的Cr3+掺杂发光材料的应用, 而且丰富了基于荧光材料带宽特性的光学测温新思路.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2021YFE0105700), the National Natural Science Foundation of China (52302177 and 51972118), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137).

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Authors and Affiliations

  1. School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China

    Yuzhen Wang  (汪玉珍) & Zhiguo Xia  (夏志国)

  2. State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Centre of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China

    Jiance Jin  (金建策), Gaochao Liu  (刘高超) & Zhiguo Xia  (夏志国)

Authors
  1. Yuzhen Wang  (汪玉珍)
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  2. Jiance Jin  (金建策)
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  3. Gaochao Liu  (刘高超)
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  4. Zhiguo Xia  (夏志国)
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Contributions

Author contributions Xia Z conceived and designed the research. Wang Y performed the experiments. Jin J conducted the DFT calculations. Wang Y wrote the paper with support from Liu G. All authors contributed to the result interpretation.

Corresponding author

Correspondence to Zhiguo Xia  (夏志国).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Yuzhen Wang is currently engaging in her postdoctoral work at the South China University of Technology under the supervision of Prof. Zhiguo Xia. She obtained her doctorate degree from Renmin University of China in 2022. Her current research interest mainly focuses on inorganic luminescent materials for fluorescent temperature sensing.

Zhiguo Xia is a professor at the South China University of Technology. He obtained his Bachelor’s degree in 2002 and Master’s degree in 2005 from Beijing Technology and Business University, and received his PhD degree from Tsinghua University in 2008. His research interests include the discovery of new rare earth-doped solid-state luminescence materials and the new luminescent metal halides and their photonics applications.

Supplementary information Experimental details, computational method and supporting data are available in the online version of the paper.

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Wang, Y., Jin, J., Liu, G. et al. Bandwidth-based flexible optical fiber thermometry based on sharp line emission regulation of Cr3+ ions. Sci. China Mater. 66, 4022–4029 (2023). https://doi.org/10.1007/s40843-023-2542-5

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