Luminescence and Energy Transfer in Fluoroindate Glasses Doped with Rare-Earth

This work reports the analysis of near-infrared luminescence of low phonon energy (510 cm−1) fluoroindate glasses co-doped with Er3+/Tm3+ and Er3+/Ho3+ ions pumped by 796 nm, 980 nm laser diode, respectively. Due to donor-acceptor energy transfer and superposition of 1450 nm (Tm3+: 3H 4 → 3F 4 ) and 1550 nm (Er3+: 4I 13/2 → 4I 15/2 ) radiative transitions in glass co-doped with 0.1ErF 3 /0.3TmF 3 a broadband emission in the range of third telecommunication window (FWHM = 152 nm, λ exc = 796 nm) was obtained. Analysis of the spectroscopic properties of the 0.8ErF 3 /1.4HoF 3 co-doped glass showed Er3+ → +R3+ energy transfer and efficient sensitization of holmium ions leading to the 1.2 μm and 2 μm emission under 980 nm laser diode excitation.