“…In particular, the influence of rare-earth ions on the electrical, photoelectric, and luminescent properties of GaSe, GaS, InSe and other III-VI crystals has been the subject of extensive studies [1][2][3][4][5][6]. In particular, the influence of rare-earth ions on the electrical, photoelectric, and luminescent properties of GaSe, GaS, InSe and other III-VI crystals has been the subject of extensive studies [1][2][3][4][5][6].…”