Preparation and Luminescent Properties of Na<sub>2</sub>Sr(MoO<sub>4</sub>)<sub>2</sub>: Eu<sup>3+</sup>, Gd<sup>3+</sup> Red Phosphors

Red phosphors Eu 3+ - doped and Eu 3+ , Gd 3+ co-doped Na 2 Sr (MoO 4 ) 2 were prepared by sol-gel method, the crystal structural, morphology and composition were characterized by powder X-ray diffraction, and scanning electron microscope. The results showed that the synthesized Na 2 Sr (MoO 4 ) 2 : Eu 3+ , Gd 3+ crystallites with stability tetragonal scheelite structure after sintering temperature at 800°C. The particle size distributions of phosphor sample are irregular and the granule size about 0.5μm.The excitation and emission spectra were investigated that the influence of Gd 3+ ions on the luminescent properties of Eu 3+ in Na 2 Sr (MoO 4 ) 2 : Eu 3+ system. Luminescent intensity of Eu 3+ on the Na 2 Sr (MoO 4 ) 2 : Eu 3+ , Gd 3+ phosphor is much stronger than that of Eu 3+ single doped. It is indicated that the sensitizing effect of Gd 3+ for luminescence of Eu 3+ obviously. The highest excitation intensity of Na 2 Sr (MoO 4 ) 2 : Eu 3+ , Gd 3+ at 466 nm, matching the output wavelengths of blue LED chips.