International Conference Physics.SPb/2024
Impurity centers and defects

Study of angular and temperature dependences of Cr$^{3+}$ impurity luminescence in $\beta$-Ga$_2$O$_3$

V. Yu. Davydov^a, Yu. È. Kitaev^a, N. S. Averkiev^a, A. N. Smirnov^a, I. A. Eliseyev^a, D. K. Nelson^a, D. Yu. Panov^b, V. A. Spiridonov^b, D. A. Bauman^b, A. E. Romanov<sup>b

a</sup> Ioffe Institute, St. Petersburg, Russia
^b St. Petersburg National Research University of Information Technologies, Mechanics and Optics, St. Petersburg, Russia

Abstract: Using the combination of angle-resolved spectroscopy and symmetry analysis of the Cr$^{3+}$ ion levels in the $\beta$-Ga$_2$O$_3$ matrix, the features of luminescence of Cr$^{3+}$ impurity in monoclinic $\beta$-Ga$_2$O$_3$ doped with Cr were studied. For the first time, angular dependences of the intensities of the $R_1$ and $R_2$ Cr$^{3+}$ lines were experimentally obtained and analyzed theoretically for three crystallographic planes (100), (010), and (001). For the first time, in the spectra of $\beta$-Ga$_2$O$_3$:Cr, two lines $R_3$ and $R_4$, which were not observed earlier, were detected. The nature of these lines was analyzed within the model of Cr$^{3+}$–Cr$^{3+}$ pair defects.

Keywords: $\beta$-Ga$_2$O$_3$, Cr$^{3+}$ impurity, photoluminescence, symmetry analysis.

Received: 30.04.2024
Revised: 28.10.2024
Accepted: 30.10.2024

DOI: 10.61011/FTT.2024.12.59591.6594PA

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