Abstract
<jats:p>The absorption and luminescence properties of Er3+ and Nd3+ ions in oxyfluoride barium boroaluminosilicate glasses of the BaO/BaF₂–SiO₂–B₂O₃–Al₂O₃ system were investigated by recording optical absorption and photoluminescence spectra. Photoluminescence of neodymium ions was exciting using laser radiation at a wavelength of 808 nm. Emission on the three main 4F3/2 → 4IJ transitions of Nd³⁺ ions was observed at wavelengths of 890, 1060, and 1330 nm. Laser radiation at wavelengths of 808 and 980 nm was used to excite infrared emission of erbium ions at ~1550 nm, corresponding to the 4I13/2 → 4I15/2 transition, as well as to excite upconversion (UC) emission of Er³⁺ ions in the visible range, including blue (2H9/2→4I15/2), green (2H11/2, 4S3/2→4I15/2), and red (4F9/2→4I15/2) luminescence․</jats:p>