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A Ho3+-Based Luminescent Thermometer for Sensitive Sensing over a Wide Temperature Range

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Abstract

Luminescence thermometry is used in a variety of research fields for noninvasive temperature sensing. Lanthanide-doped micro-/nanocrystals are exceptionally suitable for this. The popular concept of luminescence-intensity-ratio thermometry is based on emission from thermally coupled levels in a single lanthanide ion, following Boltzmann's law. These thermometers can measure temperature with low uncertainty, but only in a limited temperature range. In this work, a Ho3+-based thermometer is presented and quantitatively modeled with sustained low temperature uncertainty from room temperature up to 873 K. The thermometer shows bright green and red luminescence with a strong and opposite dependence on temperature and Ho3+ concentration. This is the result of temperature-dependent competition between multi-phonon relaxation and energy transfer, feeding the green- and red-emitting levels, respectively, following excitation with blue light. This simple and quantitative model of this competition predicts the output spectrum over a wide range of temperatures (300–873 K) and Ho3+ concentrations (0.1–30%). The optimum Ho3+ concentration can thus be determined for reliable measurements over any temperature range of interest. Quantitative modeling as presented here is crucial to optimally benefit from the potential of energy-transfer thermometers to achieve low measurement uncertainties over a wide temperature range.
Original languageEnglish
Article number2001518
Number of pages7
JournalAdvanced Optical Materials
Volume9
Issue number1
DOIs
Publication statusPublished - 4 Jan 2021

Bibliographical note

Funding Information:
This work was supported by The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation Programme funded by the Ministry of Education, Culture, and Science of the Government of The Netherlands. F.T.R. and S.J.W.V. acknowledge financial support from The Netherlands Organisation for Scientific Research NWO (Veni‐722.017.002 and OCENW.KLEIN.008). D.Y., T.Y., and Q.Z. acknowledge financial support from the National Science Foundation of China (U1601205, 51472088, and 51125005). A.M. and M.S. gratefully acknowledge funding from the EU‐Horizon 2020 FET‐Open project NanoTBTech (grant agreement no. 801305).

Funding Information:
This work was supported by The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation Programme funded by the Ministry of Education, Culture, and Science of the Government of The Netherlands. F.T.R. and S.J.W.V. acknowledge financial support from The Netherlands Organisation for Scientific Research NWO (Veni-722.017.002 and OCENW.KLEIN.008). D.Y., T.Y., and Q.Z. acknowledge financial support from the National Science Foundation of China (U1601205, 51472088, and 51125005). A.M. and M.S. gratefully acknowledge funding from the EU-Horizon 2020 FET-Open project NanoTBTech (grant agreement no. 801305).

Publisher Copyright:
© 2020 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH

Keywords

  • cross-relaxation
  • holmium
  • lanthanide luminescence
  • luminescence thermometry, remote thermometry

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