Sextuple ratiometric thermometry based on 980-nm-upconverted green fluorescence of Er3+ ions in submicron crystals

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Mei-Hong Liu
  • Xiao Wang
  • Qing Xu
  • Rui-Qi Piao
  • Chang-Yue Wang
  • And 5 others
  • Da-Yu Liu
  • Ning Yuan
  • Zi-Bo Zhang
  • Wing-Han Wong
  • De-Long Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number110512
Journal / PublicationMaterials Science and Engineering C
Volume108
Online published30 Nov 2019
Publication statusPublished - Mar 2020

Abstract

980-nm-upconverted 530 and 550 nm Er3+ green fluorescence spectra of Er3+/Yb3+-codoped NaGd(WO4)2 submicron crystals were measured in the temperature range of 298–383 K. A sextuple ratiometric thermometry is proposed. It is established on the basis of six schemes of fluorescence intensity ratio (FIR) that considers three component peaks of the 530 nm emission band and two component peaks of the 550 nm emission band, which involve electronic transitions between two Stark sublevels of Er3+. The study shows that the phosphor shows strong green fluorescence, which is verified by measured quantum yield, and thermally stable spectral structure desired for the sextuple ratiometric thermometry. All of the six FIR schemes display highly efficient sensing performances with slightly different thermal sensitivities. Each scheme gives a temperature value and the six schemes give an averaged result. In parallel, we have also carried out an ex vivo experimental study on the temperature characteristics of the green fluorescence of the phosphor. Almost same results have been obtained, verifying biological applicability of the phosphor. The ex vivo experimental results also show that the sextuple thermometry increases considerably the accuracy and reliability of temperature measurement in comparison with the conventional intensity integration method.

Research Area(s)

  • Er3+/Yb3+-codoped submicron crystals, Ex vivo measurement, Green fluorescence, Sensors, Sextuple ratiometric thermometry

Citation Format(s)

Sextuple ratiometric thermometry based on 980-nm-upconverted green fluorescence of Er3+ ions in submicron crystals. / Liu, Mei-Hong; Wang, Xiao; Xu, Qing et al.
In: Materials Science and Engineering C, Vol. 108, 110512, 03.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review