Blue-White-Green Tunable Luminescence of Ce³⁺, Tb³⁺ Co-Doped Sodium Silicate Glasses for White LEDs

Highly transparent Ce³⁺, Tb³⁺ co-doped sodium silicate glasses were prepared by melt-quenching technique. The luminescent properties of Ce³⁺, Tb³⁺ single-doped and co-doped glasses, energy transfer process from Ce³⁺ to Tb³⁺ were systemically investigated through excitation spectra, emission spectra, decay curves, and energy level diagram. Tuning the content of Tb³⁺ can generate the varied hues from blue to white and eventually to yellowish green. Our results suggest that Ce³⁺, Tb³⁺ co-doped sodium silicate glasses could be used as converting phosphors for Near-ultraviolet LED chips to generate W-LEDs.