Investigation of structural and optical properties: Tm2O3/Dy2O3 codoping in P2O5-MgO-NaF-CaF2 glass

Rare earth-doped glass is regarded as an excellent luminescent material and has been widely used in solid-state lighting. Here, the Tm3+/Dy3+ co-doped phosphate glasses revealed an increasing trend in density as the raising of Tm3+ contents, and the Urbach energies were 0.242 similar to 0.374 eV based on transmission spectra. Under the 362 nm excitation, the white light with the chromaticity coordinates that were close to the value of standard white light was produced. The electric dipole-dipole interaction plays a major role in the energy transfer process from Tm3+ to Dy3+, and the glass exhibited a very high energy transfer efficiency of 64.44% according to the fluorescence spectra. Furthermore, the luminescent intensity of Tm3+/Dy3+ co-doped glasses at 150 degrees C can still keep approximately 85.4% of its initial intensity and the glasses displayed excellent moisture-resistance (99.2%). Overall, the prepared Tm3+/Dy3+ co-doped glass exhibited potential applications in the field of W-LED and display devices.

Automated summary

Rare earth-doped glass, especially Tm3+/Dy3+ co-doped phosphate glasses, have great potential applications in solid-state lighting. The increase in Tm3+ contents enhances the density of the co-doped glasses, and the transmission spectra show Urbach energies ranging from 0.242 to 0.374 eV. Excited at 362 nm, the glasses produce white light with chromaticity coordinates close to standard white light. The energy transfer from Tm3+ to Dy3+ is mainly governed by electric dipole-dipole interaction, resulting in a high energy transfer efficiency of 64.44% according to fluorescence spectra. Moreover, the co-doped glasses exhibit a significant moisture resistance of 99.2% and retain approximately 85.4% of their initial luminescent intensity at 150 degrees C. These findings highlight the potential applications of Tm3+/Dy3+ co-doped glasses in W-LED and display devices.