The radioluminescence and photoluminescence behaviour of lithium alumino borate glasses doped with Tb₂O₃ and Gd₂O₃ for green luminescence applications

In this study, we developed the luminescence properties of Tb³⁺and Gd³⁺ dual doped 25Li₂O–5Al₂O₃-YGd₂O₃-(70-Y-Z)B₂O₃-ZTb₂O₃ glasses were prepared by a conventional melt-quenching method. As the concentrations of Gd³⁺ increase, both the radioluminescence and photoluminescence results increase, and then 2.5% Gd³⁺doped glass sample under excitation wavelength with 222, 275, 377 nm providing the strong green emission intensity (at 543 nm) due to the optimum concentration happens. Analysis of the Tb L_III-edge XANES spectra data of LABT series glasses have confirmed the presence of Tb³⁺. The PL band with the highest intensity of Tb³⁺ ion in this glass is 4.0 mol% as it results from a maximum of both emission and excitation intensity. The experimental decay times calculated from the decay profiles have been observed to be declining gradually from 2.682 to 2.450 ms with the increase in Tb³⁺ ion concentration. The energy transfer in the borate glass from Gd³⁺ to Tb³⁺ is carried out by non-radiative processes with an efficiency close to 59.20%. The synthesized glass exhibit a high potential candidate for green luminescence applications.