Judd-Ofelt Analysis and Emission Properties of Dy3+ Ions in Borogermanate Glasses

Borogermanate glasses singly doped with Dy3+ ions were synthesized and then studied using the absorption and luminescence spectra. Spectroscopic changes of Dy3+ ions have been examined for compositional-dependent glasses with various molar ratios GeO2:B2O3. In this work, several spectroscopic parameters of Dy3+ 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 F-4(9/2) -> H-6(15/2), F-4(9/2) -> H-6(13/2) and F-4(9/2) -> H-6(11/2) transitions of Dy3+, respectively. Luminescence lifetimes for the F-4(9/2) excited state are reduced, whereas the stimulated emission cross-sections for the most intense F-4(9/2) -> H-6(13/2) yellow transition of Dy3+ increase with increasing GeO2 and decreasing B2O3 concentrations in glass-hosts. Quantum efficiency of the F-4(9/2) (Dy3+) excited state is nearly independent on molar ratios GeO2:B2O3. Attractive spectroscopic properties related to the F-4(9/2) -> H-6(13/2) transition of Dy3+ ions are found for borogermanate glasses implying their potential utility for yellow laser action and solid-state lighting technology.

Automated summary

By studying the spectroscopic properties of borogermanate glasses doped with Dy3+ ions, it was found that under specific compositions, these glasses can exhibit blue, yellow, and red luminescence. The luminescence lifetimes and stimulated emission cross-sections of Dy3+ ions can be enhanced by changing the molar ratios of GeO2 and B2O3.