Near- and mid-infrared emissions of Dy3+ doped and Dy3+/Tm3+co-doped lead cesium iodide modified chalcohalide glasses

0.2 wt% Dy3+ doped and 0.2 wt% Dy3+/0.5 wt% Tm3+ co-doped novel GeS2–Ga2S3–PbS–CsI chalcohalide glasses were prepared and their spectroscopic properties were analyzed based on absorption (ranges from 300 to 3000 nm) and emission (ranges from 1000 to 4700 nm) measurements. Judd–Ofelt analyses were performed to estimate radiative transition parameters for the excited levels. Compositional dependences of near- and mid-infrared luminescences (especially the 1330, 2930 and 4320 nm) excited at 808 nm were investigated and discussed. These novel chalcohalide glasses may have potential uses in 1.3 μm fiber-amplifiers and 2.9 or 4.3 μm mid-infrared laser devices. -- Highlights: • Novel Dy3+/Tm3+ doped GeS2–Ga2S3–PbS–CsI glasses were firstly studied. • Compositional dependence of luminescence properties was studied. • Radiative properties have been determined using the Judd–Ofelt theory. • Dy3+: 68GeS2·17Ga2S3·7.5PbS·7.5CsI glass is valuable for 1.3 μm fiber-amplifier. • Dy3+/Tm3+: 72GeS2·18Ga2S3·5PbS·5CsI glass is valuable for 2.9 and 4.3 μm fiber-laser