Structural and photoluminescence properties of Tm3+-Dy3+-codoped phosphate glasses

Luminescent glass has drawn widespread interest due to its exceptional properties and has been widely used in solid-state-lighting fields. Herein, a series of Q0, Q1 and Q2 group-containing Dy3+/Tm3+-codoped phosphate glasses with monotonically increasing density and glass stability were prepared. The glasses that emerged from this work displayed eight distinct absorption peaks in their absorption spectra, and the energy transfer from Dy3+ to Tm3+ manifested with the increase of Tm3+ contents under the excitation of 351 nm light. The temperature-dependent emission spectra demonstrated that the glass was thermally stable, and the fluorescence curves demonstrated that the energy transfer mechanism was the electric dipole-dipole interaction. Tuning the sensitizer and activator contents, white-light emission with suitable chromaticity coordinates and CCTs can be obtained. The findings indicated the potential prospects of this glass in lighting applications. © 2022 Elsevier B.V.