Structure, luminescence properties, and energy transfer of Dy3+/Sm3+co-doped BCAZM glasses for white LED applications

B2O3-CaO-Al2O3-ZnO-MoO3 2 O 3 - CaO-Al 2 O 3 - ZnO-MoO 3 luminescent glasses doped with Dy3+, 3 + , Sm3+, 3 + , and Dy3+/Sm3+ 3 + /Sm 3 + were prepared by melt-quenching method. Structure, luminescence properties, energy transfer and thermal stability of the glasses were analysed. As deduced from the increase in density, [BO4] 4 ] unit proportion and Dy3+ 3 + luminescence yellow/ blue ratio and the decrease in band gap value, the increase in the doping concentration of Sm2O3 2 O 3 promotes the formation of non-bridging oxygen and enhances the structural asymmetry. Meanwhile, the change in Dy3+ 3 + emission intensity and the decrease in fluorescence lifetime indicate the presence of an energy transfer from Dy3+ 3 + to Sm3+, 3 + , and the Inokuti-Hirayama model fit suggests that the energy transfer may occur within the Dy3+-Sm3+ 3 +-Sm 3 + cluster. In addition, the CIE chromaticity coordinates and correlated colour temperature of the Dy3+/Sm3+ 3 + /Sm 3 + co- doped B2O3-CaO-Al2O3-ZnO-MoO3 2 O 3 - CaO-Al 2 O 3 - ZnO-MoO 3 glass fall within the white light region and have good thermal stability, which is potentially promising for application in W-LED lighting.