Abstract
Temperature determination is of fundamental importance for a wide variety of applications in scientific research, technological developments, biomedical applications, and control of many industrial processes. To supply all these needs, a variety of sensors and devices using different methods have been developed. In this work, we propose a new alternative for a luminescent thermometer based on the visible emission of the europium ion (Eu3+) in the Y2O3 matrix. The sharp emission peak observed at 612 nm was achieved by exciting the Y2O3:Eu3+ ceramic powders with a broadband LED light source centered at 395 nm. The temperature-sensing behavior was explored based on the valley-to-peak ratio (VPR) approach. Thermal sensing performance based on red-emitting level (5D0 → 7F2) as a function of the temperature, in the range of 298–573 K, has been considered to evaluate the thermometric parameters. The evaluated thermal sensitivity in Y2O3:Eu3+ is around 0.53% K−1 at 298 K in our experimental range. Results imply that the present phosphor Y2O3:Eu3+ exhibits high and stable sensitivity in a wide temperature range. Hence, this work demonstrates the basis for the manufacture of thermometer of low cost, using simple commercial LED as a source of excitation.
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Acknowledgements
This work was financially supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE) Brazilian Agencies. SAV thanks CNPq for the junior post-doctoral fellowship (Process Number 160920/2019-1). This work was also carried out under the support of the National Institute of Photonics (INFO) and PRONEX—Center of Excellence Program supported by the mentioned Brazilian agencies.
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Rakov, N., Vieira, S.A. & Gomes, A.S.L. Highly sensitive optical thermometry operation using Eu3+:Y2O3 powders excited under low-intensity LED light source at 395 nm. J Mater Sci: Mater Electron 32, 23285–23292 (2021). https://doi.org/10.1007/s10854-021-06813-6
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DOI: https://doi.org/10.1007/s10854-021-06813-6