The photoluminescent property and optical transition analysis of host sensitized Ca_(0.5)Sr_(0.5)MoO_4:Dy~(3+) phosphor

摘要

A series of Dy~(3+) doped Ca_(0.5)Sr_(0.5)MoO_4 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 Ca_(0.5)Sr_(0.5)MoO_4:xDy~(3+) 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 Dy~(3+), indicating the energy transfer from the host to Dy~(3+). The chromaticity coordinates changed from blue-green to yellow area depending on the Dy~(3+) concentration. In addition, the main mechanism of the concentration quenching was the electric multiple interaction between Dy~(3+) ions.