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.