Improvement of sensing sensitivity based on green emissions from Er-doped (AlGa)2O3 films
Improvement of sensing sensitivity based on green emissions from Er-doped (AlGa)2O3 films
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DOI：
10.1016/j.jlumin.2020.117879
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发表时间：
2021-04
影响因子：
3.6
通讯作者：
Gaofeng Deng;Katsuhiko Saito;Tooru Tanaka;Q. Guo
中科院分区：
文献类型：
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作者：
Gaofeng Deng;Katsuhiko Saito;Tooru Tanaka;Q. Guo
在77-400K温度范围内，研究了不同Al含量的掺Er(AlGa)_2O_3薄膜在绿区的光致发光行为，发现随着基质带隙的增加，绿区的热猝灭减少，导致绿光发射增强。随后，基于Er3+中2H11/2和4S3/2的热耦合能级，利用荧光强度比(FIR)技术研究了薄膜的温度传感特性。随着薄膜中Al含量的增加，薄膜的热敏性能增强。当Al含量为0.0056.77时，薄膜的绝对灵敏度为0.0056 K，是−：Er薄膜的两倍。最后，研究了Al含量对激光泵浦功率引起的热效应的影响，结果表明，在本工作中，所有样品中由泵浦功率引起的热效应可以忽略不计。这项工作为开发高发光效率和高灵敏度的光学温度传感器提供了有益的启示。
The temperature-dependent photoluminescence behaviors in green region of Er-doped (AlGa)2O3films with different Al contents have been studied in the temperature range of 77–400 K. A reduced thermal quenching in green region was observed with the increase of host bandgap, resulting in an enhancement of green emissions. Subsequently, the temperature sensing properties of films were studied by using the fluorescent intensity ratio (FIR) technique based on the thermally coupled levels of2H11/2and4S3/2in Er3+. The enhanced thermal sensing properties were found with the increase of Al content in films. The absolute sensitivity of 0.0056 K−1at 400 K was obtained at the Al content of 0.77, which is twice that of Ga2O3:Er film. Finally, the effect of adding Al content on the thermal effect induced by the laser pump power was investigated, and the results suggest that the thermal effect in all samples induced by the pump power can be negligible in this work. This work provides a useful insight for developing optical temperature sensors with high luminescence efficiency and sensitivity.