White-light emission characteristics of rare-earth ion-doped sodium borate glass

Sodium borate glass embedded with Tb 3+ , Sm 3+ and Dy 3+ was made by the melt quenching technique. The resulting glass is highly transparent. Absorption, and emission spectral measurements are performed. Under a diode laser excitation the glass emitted warm white light. Lifetimes of the excited levels are measured. CIE color co-ordinates and color temperature are measured.