Structural and optical properties of Dy3+-doped lithium borate glass.

The ratio between the network modifier Li₂O and the network former B₂O₃ has a significant influence on the structural and optical properties of Dy³⁺-doped lithium borate glass. Differential scanning calorimetry shows that upon increasing the modifier-to-former ratio (Li₂O-to-B₂O₃) in favour of Li₂O, the glass transition temperature increases up to a maximum value of 502°C for the 1:3 sample, while the crystallization temperature decreases linearly from 653 to 534°C. Raman spectroscopy confirms the highest network connectivity for the glass with a modifier-to-former ratio of 1:3. Under ultraviolet excitation, Dy³⁺ shows emission lines in the visible spectral range, the most intense ones at 484 and 575 nm. The absolute photoluminescence quantum efficiency is best for the glass with a modifier-to-former ratio of 1:6. [ABSTRACT FROM AUTHOR]