Volume 12 Issue 3
Jun.  2019
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LI Xiao-xiao, LI Yun-qian, WANG Xin, YANG Yan-min. Highly sensitive down-conversion optical temperature-measurement material: NaGd(WO4)2: Yb3+/Er3+[J]. Chinese Optics, 2019, 12(3): 596-605. doi: 10.3788/CO.20191203.0596
Citation: LI Xiao-xiao, LI Yun-qian, WANG Xin, YANG Yan-min. Highly sensitive down-conversion optical temperature-measurement material: NaGd(WO4)2: Yb3+/Er3+[J]. Chinese Optics, 2019, 12(3): 596-605. doi: 10.3788/CO.20191203.0596

Highly sensitive down-conversion optical temperature-measurement material: NaGd(WO4)2: Yb3+/Er3+

doi: 10.3788/CO.20191203.0596

National Natural Science Foundation of China 11474083

Natural Science Foundation of Hebei Province A2015201192

Scientific Research Project of Hebei Education Department ZD2014069

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  • Corresponding author: YANG Yan-min, E-mail:mihuyym@163.com
  • Received Date: 08 Nov 2018
  • Rev Recd Date: 07 Dec 2018
  • Publish Date: 01 Jun 2019
  • The fluorescence intensity ratio(FIR) thermometry based on the measurement of luminous intensities of two thermal coupling energy levels of Er3+ provides high precision for the non-contacted thermometry due to its independency of the spectral loss and excitation intensity fluctuations. However, the common FIR technology is based on the up-conversion(UC) excitation, and its low up-conversion efficiency makes the temperature measurement inaccurate. Considering that the thermalization of population in Er3+ can be achieved by different excitation sources, we utilize the efficient down-conversion(DC) optical temperature measurement with a high-energy photon excitation. A tungstate material of NaGd(WO4)2 with high temperature sensitivity is used as the matrix material. It is found that NaGd(WO4)2 can be successfully applied for the DC thermometry, and the temperature sensitivity of Yb3+/Er3+ co-doped sample is higher than that of Er3+ single-doped one. In addition, the DC thermometry possesses higher sensitivity than UC, and the temperature sensitivity of 20%Yb3+/1%Er3+ doped sample is up to 344.6×10-4 K-1, which demonstrates that NaGd(WO4)2:Yb3+/Er3+ is an ideal temperature measuring material. More importantly, it further proves the feasibility of highly sensitive DC thermometry and opens up new prospects for the utilizations of FIR technology.


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