Solid state reaction synthesis and photoluminescence properties of Dy~(3+) doped NaGd(MoO_4)_2 phosphor

摘要

Dy~(3+) doped NaGd(MoO_4)_2 phosphors were synthesized by a traditional solid-state reaction route using NH_4HF_2 as a flux. The influence of calcination temperature on the crystal structure and spectral properties was studied, and the optimum calcination temperature for producing Dy~(3+) doped NaGd(MoO_4)_2 phosphor was experimentally confirmed. The concentration quenching of Dy~(3+) fluorescence and excitation-wavelength dependent spectroscopic properties were studied. On the base of both the Van Uitert's and I-H models, the electric dipole-dipole (D-D) interaction was ascribed to be the main physical mechanism responsible for energy transfer between Dy~(3+) ions. It was also discovered that the color coordinates of the Dy~(3+) doped NaGd(MoO_4)_2 phosphor depends on the Dy~(3+) doping concentration and the excitation wavelength.