Abstract
Borogermanate glasses singly doped with Dy(3+) ions were synthesized and then studied using the absorption and luminescence spectra. Spectroscopic changes of Dy(3+) ions have been examined for compositional-dependent glasses with various molar ratios GeO(2):B(2)O(3). In this work, several spectroscopic parameters of Dy(3+) ions were obtained experimentally and compared to the calculated values from the Judd-Ofelt theory. Luminescence spectra measured for borogermanate glasses consist of blue, yellow and red bands, which correspond to (4)F(9/2) → (6)H(15/2), (4)F(9/2) → (6)H(13/2) and (4)F(9/2) → (6)H(11/2) transitions of Dy(3+), respectively. Luminescence lifetimes for the (4)F(9/2) excited state are reduced, whereas the stimulated emission cross-sections for the most intense (4)F(9/2) → (6)H(13/2) yellow transition of Dy(3+) increase with increasing GeO(2) and decreasing B(2)O(3) concentrations in glass-hosts. Quantum efficiency of the (4)F(9/2) (Dy(3+)) excited state is nearly independent on molar ratios GeO(2):B(2)O(3). Attractive spectroscopic properties related to the (4)F(9/2) → (6)H(13/2) transition of Dy(3+) ions are found for borogermanate glasses implying their potential utility for yellow laser action and solid-state lighting technology.