YAl3(BO3)4:Cr crystals for luminescent cryothermometry
Molchanova A. D. 1, Diab M.1,2, Boldyrev K.N.1, Popova M.N. 1
1Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
2Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region, Russia
Email: nastyamolchanova@list.ru, popova@isan.troitsk.ru

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The luminescence spectra of the YAl3(BO3)4:Cr3+ crystal have been registered in the spectral range of 2E->4A2 electronic transitions in Cr3+ ions (14550-14700 cm-1) with high spectral resolution at temperatures 4-300 K. The temperature dependences of the ratios of the integral intensities of lines R2 and R1, as well as N' and N (presumably the lines of the 2E->4A2 transitions of the Cr3+ center in a position distorted due to the vicinity of a some defect), correspond well to the Boltzmann distribution. On the measurement of these ratios, a ratiometric thermometer with a maximum absolute sensitivity at temperatures 40.3 and 21.6 K, respectively, and a relative sensitivity of up to 12% K-1 can be realized. Measuring the width of the most intense spectral component - line R1 - can be a way to capture temperature in the range of 100 K and above. Keywords: luminescent cryothermometry, YAl3(BO3)4:Cr3+ crystal, high-resolution Fourier-transform spectroscopy.
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