EPR, optical and thermometric studies of Cr3+ ions in the α-Al2O3 synthetic single crystal


Mironova – Ulmane N. Brik M.G. Grube J. Krieke G. M.Kemere Antuzevics A. Gabrusenoks E. Skvortsova V. Elsts E. Sarakovskis A. Piasecki M. Popov A.I.
October 2022Elsevier B.V.

Optical Materials
2022#132

The optical spectra of a single crystal of α-Al2O3Cr3+ were studied in a wide temperature range. The crystal was demonstrated to have a potential for optical thermometric applications. Three ways of measuring temperature were tested and analyzed: i) luminescence intensity ratio of the R1 and R2 lines; ii) change of the full width of half maxima of the R1 and R2 lines, and iii) thermal shifts of the R1 and R2 lines maxima. The highest absolute and relative sensitivities were obtained at cryogenic temperatures. In addition, the thermal shifts of the R lines were analyzed using the McCumber-Sturge equation to estimate the Debye temperature and the electron-vibrational interaction parameter.

Luminescence intensity ratio , McCumber-sturge theory , Optical thermometry

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Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, Riga, LV-1063, Latvia
School of Optoelectronic Engineering & CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China
Institute of Physics, University of Tartu, W. Ostwald Str. 1, Tartu, 50411, Estonia
Centre of Excellence for Photoconversion, Vinca Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, P.O. Box 522, Belgrade, 11001, Serbia
Academy of Romanian Scientists, Ilfov Str. No. 3, Bucharest, 050044, Romania
Faculty of Science and Technology, Jan Długosz University, Armii Krajowej 13/15, Częstochowa, PL-42200, Poland
Inorganic Chemistry Department, Uzhhorod National University, 46 Pidhirna, Uzhhorod, UA-88000, Ukraine
Department of Technical Physics, L.N. Gumilyov Eurasian National University, Nur-Sultan, 010008, Kazakhstan

Institute of Solid State Physics
School of Optoelectronic Engineering & CQUPT-BUL Innovation Institute
Institute of Physics
Centre of Excellence for Photoconversion
Academy of Romanian Scientists
Faculty of Science and Technology
Inorganic Chemistry Department
Department of Technical Physics

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