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Extending the dynamic temperature range of Boltzmann thermometers
Thomas Pieter van Swieten1, Jesse Merlijn Steenhoff1, Auke Vlasblom1
1Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC, Utrecht, The Netherlands.
Light, Science & Applications
|December 9, 2022
Summary
Lanthanide-doped (nano)crystals enable luminescence thermometry by tracking emission intensity ratios. This study optimizes these thermometers to operate effectively at lower temperatures, expanding their utility.
Area of Science:
- Materials Science
- Nanotechnology
- Spectroscopy
Background:
- Lanthanide-doped (nano)crystals are key for luminescence thermometry.
- Thermometers typically use emission intensity ratios from thermally coupled states.
- Thermal equilibrium allows for Boltzmann statistics-based calibration.
Purpose of the Study:
- To investigate strategies for shifting the onset of thermal equilibrium to lower temperatures.
- To enable Boltzmann thermometry over a wider dynamic range.
- To optimize lanthanide-doped materials for enhanced thermometry.
Main Methods:
- Utilizing europium (Eu3+)-doped microcrystals as a model system.
- Investigating host lattice properties (vibrational energies, lanthanide-ligand distances).
- Analyzing the influence of transition types (electric-dipole vs. magnetic-dipole) on energy levels.
Main Results:
- Increased nonradiative coupling rates were observed with higher host lattice vibrational energies and shorter lanthanide-ligand distances.
- The onset temperature for thermal equilibrium was reduced by over 400 K.
- Thermometers with electric-dipole coupled states exhibited lower onset temperatures compared to magnetic-dipole coupled states.
Conclusions:
- Host lattice properties significantly influence nonradiative coupling and the onset temperature of thermal equilibrium.
- Electric-dipole transitions offer advantages for achieving lower operational temperatures in Boltzmann thermometers.
- These findings provide crucial guidelines for designing advanced luminescence thermometers with extended temperature ranges.
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