Demonstration of Temperature Dependent Energy Migration in Dual-Mode YVO4: Ho3+/Yb3+ Nanocrystals for Low Temperature Thermometry
2016 | journal article. A publication with affiliation to the University of Göttingen.
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Mahata, M. K., Koppe, T., Kumar, K., Hofsaess, H. & Vetter, U. (2016). Demonstration of Temperature Dependent Energy Migration in Dual-Mode YVO4: Ho3+/Yb3+ Nanocrystals for Low Temperature Thermometry. Scientific Reports, 6, Article 36342. doi: https://doi.org/10.1038/srep36342
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Details
- Authors
- Mahata, Manoj Kumar; Koppe, Tristan; Kumar, Kaushal; Hofsaess, Hans; Vetter, Ulrich
- Abstract
- A dual mode rare-earth based vanadate material (YVO4: Ho3+/Yb3+), prepared through ethylene glycol assisted hydrothermal method, demonstrating both downconversion and upconversion, along with systematic investigation of the luminescence spectroscopy within 12-300 K is presented herein. The energy transfer processes have been explored via steady-state and time-resolved spectroscopic measurements and explained in terms of rate equation description and temporal evolution below room temperature. The maximum time for energy migration from host to rare earth (Ho3+) increases (0.157 mu s to 0.514 mu s) with the material's temperature decreasing from 300 K to 12 K. The mechanism responsible for variation of the transients' character is discussed through thermalization and non-radiative transitions in the system. More significantly, the temperature of the nanocrystals was determined using not only the thermally equilibrated radiative intra-4f transitions of Ho3+ but also the decay time and rise time of vanadate and Ho3+ energy levels. Our studies show that the material is highly suitable for temperature sensing below room temperature. The maximum relative sensor sensitivity using the rise time of Ho3+ energy level (F-5(4)/S-5(2)) is 1.35% K-1, which is the highest among the known sensitivities for luminescence based thermal probes.
- Issue Date
- 2016
- Status
- published
- Publisher
- Nature Publishing Group
- Journal
- Scientific Reports
- Organization
- Fakultät für Physik
- ISSN
- 2045-2322
- Sponsor
- European Commission; Department of Science and Technology, New Delhi
Open-Access-Publikationsfonds 2016