Abstract
Fluoroindate glasses co-doped with Pr3+/Er3+ ions were synthesized and their near-infrared luminescence properties have been examined under selective excitation wavelengths. For the Pr3+/Er3+ co-doped glass samples several radiative and nonradiative relaxation channels and their mechanisms are proposed under direct excitation of Pr3+ and/or Er3+. The energy transfer processes between Pr3+ and Er3+ ions in fluoroindate glasses were identified. In particular, broadband near-infrared luminescence (FWHM = 278 nm) associated to the 1G4 → 3H5 (Pr3+), 1D2 → 1G4 (Pr3+) and 4I13/2 → 4I15/2 (Er3+) transitions of rare earth ions in fluoroindate glass is successfully observed under direct excitation at 483 nm. Near-infrared luminescence spectra and their decays for glass samples co-doped with Pr3+/Er3+ are compared to the experimental results obtained for fluoroindate glasses singly doped with rare earth ions.
Highlights
Fluoroindate glasses co-doped with Pr3+/Er3+ ions were synthesized and their near-infrared luminescence properties have been examined under selective excitation wavelengths
Fluoroindate glasses belong to the low-phonon Heavy Metal Fluoride Glass (HMFG) family, which have been extensively studied for their numerous optical applications
The optical absorption spectra of fluoroindate glasses singly doped with Pr3+ and Er3+ ions were recorded at room temperature
Summary
Fluoroindate glasses co-doped with Pr3+/Er3+ ions were synthesized and their near-infrared luminescence properties have been examined under selective excitation wavelengths. An intensity enhancement of 4.5 for the green up-conversion luminescence in Er3+/Yb3+ co-doped fluoroindate glass has been obtained by focusing the incoming beam with a 3.8 μm silica microsphere[14] These experimental results open a new method to improve the up-conversion emission intensity in biological samples with rare earth doped nanoparticles that can be used as nano-sensors. The mid-infrared luminescence results obtained for E r3+/Yb3+ ions in fluoroindate glass suggest that co-doping with Yb3+ favors only the up-conversion processes which depopulate efficiently the 4I11/2 state, reducing the emission intensity related to 4I11/2 → 4I13/2 transition of E r3+ ions at 2.8 μm[13] These phenomena are important for diode-pumped solid-state lasers, which could provide a compact and efficient device with the advantage of easy coupling with fiber integrated optical systems. To the best of our knowledge, these phenomena were not yet examined for fluoroindate glasses co-doped with P r3+/Er3+
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