Optical thermometry based on the red upconversion fluorescence of Er3+ in CaWO4:Yb3+/Er3+ polycrystalline powder

Leipeng Li, Longjiang Zheng, Wei Xu, Zhang Liang, Yuan Zhou, Zhiguo Zhang, Wenwu Cao

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Based on the fluorescence intensity ratio method, the temperature- sensing behavior through thermally coupled levels (TCL) of the 2H11/2 and 4S3/2 states as well as the sublevels of the 4F9/2 state of Er3+ has been studied. The thermometry is observed to be dependent on the pump power for the 2H11/2 and 4S3/2 states, leading to an error of more than 20 K at 478 K. By utilizing the sub-levels of the 4F9/2 state, such a problem could be solved. The maximum sensitivity is about 0.15% K-1 at 298 K. This will provide guidance on selecting appropriate and practical TCL for precisely sensing the temperature.

Original languageEnglish (US)
Pages (from-to)1458-1461
Number of pages4
JournalOptics Letters
Issue number7
StatePublished - Apr 1 2016

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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