Optical thermometry through green upconversion emissions in Er 3+/Yb 3+-codoped CaWO 4 phosphor

Wei Xu, Xiaoyang Gao, Longjiang Zheng, Peng Wang, Zhiguo Zhang, Wenwu Cao

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

Under 980nm excitation, the temperature-dependent green upconversion emissions from Er 3+/Yb 3+-codoped CaWO 4 phosphor were studied at temperatures from 294 to 923 K. By using the fluorescence intensity ratio technique, the maximum sensitivity for temperature measurement achieved here is approximately 0.0092 K -1, which is much higher than previously reported temperature sensors based on the fluorescence of Er 3+ions in other host materials. With the efficient upconversion fluorescence, the Er 3+/Yb 3+-codoped CaWO 4 is a very promising candidate for optical high-temperature sensors with high sensitivity and good accuracy.

Original languageEnglish (US)
Article number072201
JournalApplied Physics Express
Volume5
Issue number7
DOIs
StatePublished - Jul 2012

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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