Solid state reaction synthesis and photoluminescence properties of Dy3+ doped NaGd(MoO4)2 phosphor

Dy3+ doped NaGd(MoO4)(2) phosphors were synthesized by a traditional solid-state reaction route using NH4HF2 as a flux. The influence of calcination temperature on the crystal structure and spectral properties was studied, and the optimum calcination temperature for producing Dy3+ doped NaGd(MoO4)(2) phosphor was experimentally confirmed. The concentration quenching of Dy3+ 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 Dy3+ ions. It was also discovered that the color coordinates of the Dy3+ doped NaGd(MoO4)(2) phosphor depends on the Dy3+ doping concentration and the excitation wavelength. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.