Preparation and spectroscopic studies of the MgxSr1−xAl2O4:Eu, Dy (x = 0.05–0.25) persistent phosphors

MgxSr1−xAl2O4:Eu, Dy (x = 0.05–0.25) phosphors were prepared by the solid-state reaction method; their excitation and emission spectra corresponding to the transitions between the ground 4f7 and excited 4f65d1 configurations of Eu2+ ion were studied. Broad band UV excited luminescence attributed to Eu2+ ions was observed around 19,500 cm−1 (513 nm). From the comparison between the excitation and emission spectra, the crystal field splitting of the Eu2+ 5d states and the parameters of electron–vibrational interaction, such as the Huang–Rhys factor, effective phonon energy, and zero-phonon line position for the studied compound were estimated for the first time.