The influence of different Germanium dioxide concentration on the structural, thermal, optical and spectroscopic properties of Er3+ doped tellurite glasses was carefully investigated. The glasses were prepared by melt-quenching technique. The samples were characterized by UV–visible–near-infrared spectroscopy, downshift emission spectroscopy, Raman spectroscopy, lifetime of green emission and up-conversion under near-infrared laser diode excitation at 975 nm. The Judd-Ofelt analysis was performed based on the absorption spectra of the glasses in order to obtain the Judd-Ofelt parameters (Ωλ), radiative transition rates, radiative lifetimes and quantum efficiency. The solubility of Er3+ into the host vitreous matrix, the enhancement in the luminescence intensity and improvement in the thermal stability (≥ 100 ∘C) of the glasses was verified on introducing GeO2.
Bibliographical noteFunding Information:
This research was supported by the brazilian agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico/Instituto Nacional de Óptica e Fotônica ( CNPq /INOF - processes 310925/2017-7 and 234608/2014-5), Centro de Pesquisa em Óptica e Fotônica (CePOF - Fapesp - process 13/07276-1), Coordenação de Aperfeiçoamento Pessoal de Nvel Superior ( CAPES ) and by the Canada Excellence Research Chairs ( CERC ).
© 2020 Elsevier B.V.
- Germanate glass
- Luminescent materials
- Tellurite glass