The photoluminescent property and optical transition analysis of host sensitized Ca0.5Sr0.5MoO4:Dy3+ phosphor

•A novel host sensitized Ca0.5−xSr0.5MoO4:xDy3+ phosphors could be synthesized by solid state reaction.•The XRD and SEM figures were made to analyze the crystal phase and morphology of Ca0.5−xSr0.5MoO4:xDy3+ phosphors.•We research the emission and excitation properties by analyzing the relevant optical transition.•The energy transition is proved to exist by the analysis on luminescence spectra and luminescence decay curves.•The chromaticity coordinate of Ca0.5−xSr0.5MoO4:xDy3+ will be tunable as changing x.

A series of Dy3+ doped Ca0.5Sr0.5MoO4 phosphors were synthesized by solid state reaction. The structure and the photoluminescent (PL) properties of the as-prepared powders were characterized by X-ray diffraction (XRD), field emission scanning electron microscope and fluorescent spectrophotometry. The analyses on optical transition of Ca0.5Sr0.5MoO4:xDy3+ phosphors indicate that the broad band of excitation spectrum comes from the charge transmission. The broad band of excitation spectrum matches well with the excitation energy level of Dy3+, indicating the energy transfer from the host to Dy3+. The chromaticity coordinates changed from blue–green to yellow area depending on the Dy3+ concentration. In addition, the main mechanism of the concentration quenching was the electric multiple interaction between Dy3+ ions.