基于调控Cr^(3+)锐线发射带宽的柔性光纤温度传感器  

Bandwidth-based flexible optical fiber thermometry based on sharp line emission regulation of Cr^(3+)ions

作　　者：汪玉珍 金建策 刘高超 夏志国 Yuzhen Wang;Jiance Jin;Gaochao Liu;Zhiguo Xia(School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510641,China;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)

机构地区：[1]School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510641,China [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

出　　处：《Science China Materials》2023年第10期4022-4029,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Key Research and Development Program of China(2021YFE0105700);the National Natural Science Foundation of China(52302177 and 51972118);the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2017BT01X137)。

摘　　要：我们设计并制备了一种基于LiGa_(4)(MgGe)_(0.5)O_(8):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LiGa_(5-x)(MgGe)_(x)O_(8):Cr中[Mg^(2+)-Ge^(4+)]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,LiGa_(4)-(MgGe)_(0.5)O_(8):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^(-1)K^(-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Cr^(3+)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.We designed and fabricated a flexible optical fiber based on LiGa_(4)(MgGe)_(0.5)O_(8):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[Mg^(2+)-Ge^(4+)]unit in LiGa_(4)(MgGe)_(0.5)O_(8):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 Cr^(3+)-doped luminescent materials with sharp emissions but also enriches the new routes of optical temperature measurement owing to the bandwidth characteristics.

关 键 词：optical thermometry full width at half maximum(FWHM) flexible optical fiber structural modification 

分 类 号：TP212.11[自动化与计算机技术—检测技术与自动化装置]