Abstract
Luminescence thermometry is the most versatile remote temperature sensing technique and can be employed from living cells to large surfaces and from cryogenic temperatures to the melting points of metals. Ongoing research aims to optimize the sensitivity of the ratio between the emission intensity from two coupled excited states. However, this approach is inherently limited to temperature-dependent processes involving only the excited states. Here, we develop a novel measurement technique, called luminescence intensity ratio squared (LIR2) for the Yb3+/Er3+ pair, that combines the temperature sensitivity of ground- and excited-state populations. We use Y3Al5O12:Er3+,Yb3+ nanoparticles as a promising model system with both visible and infrared emissions. To apply our method, we record two luminescence spectra at different excitation wavelengths and determine the LIR2 using one emission in each of the two spectra. The LIR2 testing with Y3Al5O12 nanoparticles showed a sensitivity increase of 70% in the visible region and an impressive 230% increase in the NIR region compared to the conventional LIR method. This enhances the measurement precision by a factor of 1.5-2.5. The LIR2 based on the visible upconversion emission is particularly useful for measurements of high temperatures, while the LIR2 based on the downshifted ∼1.5 μm emission may revolutionize temperature measurements of biological samples in the range of physiological temperatures.
Original language | English |
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Article number | 194501 |
Journal | Journal of Applied Physics |
Volume | 133 |
Issue number | 19 |
DOIs | |
Publication status | Published - 21 May 2023 |
Bibliographical note
Publisher Copyright:© 2023 Author(s).
Funding
This work was supported by the Ministry of Science, Technological Development and Innovation of the Republic of Serbia (No. 451-03-47/2023-01/200017). T.v.S. and A.M. gratefully acknowledge support 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. The authors acknowledge Dr. Zoran Ristić for the diffuse reflection measurements.
Funders | Funder number |
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MCEC | |
Netherlands Center for Multiscale Catalytic Energy Conversion | |
Ministerie van onderwijs, cultuur en wetenschap | |
Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja | 451-03-47/2023-01/200017 |