Investigation on photoluminescence properties of Eu3+-doped Sr2Mg1-xZnxSi2O7 (0≤x≤1) in UV-VUV region

Undoped and Eu3+-doped Sr2Mg1-xZnxSi2O7 (0≤x≤1) powder crystal samples were obtained via a conventional solid-state reaction method. The XRD result and FT-IR spectra demonstrated the complete solid-solution as well as lattice distortion between Sr2MgSi2O7 and Sr2ZnSi2O7. The UV emission spectra showed the main emission around 616nm, which implied the non-inversion symmetry around Eu3+ in Sr2Mg1-xZnxSi2O7:Eu3+ (0≤x≤1). The UV excitation spectra exhibited the Eu3+-O2- CT transitions centered at 250nm and 258nm in Sr2MgSi2O7:Eu3+ and Sr2ZnSi2O7:Eu3+, respectively. The emission of Sr2(Mg, Zn)Si2O7:Eu3+ under 147nm light excitation is very weak, which suggests that energy transfer from the host to the activator is not so efficient in Sr2Mg1-xZnxSi2O7:Eu3+ (0≤x≤1) system.