Abstract:
The luminescence spectra of the YAl$_3$(BO$_3$)$_4$:Cr$^{3+}$ crystal have been registered in the spectral range of $^2E\to{}^4A_2$ центра Cr$^{3+}$ electronic transitions in Cr$^{3+}$ 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 $R_2$ and $R_1$, as well as $N'$ and $N$ (presumably the lines of the $^2E\to{}^4A_2$ центра Cr$^{3+}$ transitions of the Cr$^{3+}$ 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 $R_1$ – can be a way to capture temperature in the range of 100 K and above.
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