Abstract
Red phosphors Eu3+- doped and Eu3+, Gd3+ co-doped Na2Sr (MoO4)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 Na2Sr (MoO4)2: Eu3+, Gd3+ 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 Gd3+ ions on the luminescent properties of Eu3+ in Na2Sr (MoO4)2: Eu3+ system. Luminescent intensity of Eu3+ on the Na2Sr (MoO4)2: Eu3+, Gd3+ phosphor is much stronger than that of Eu3+ single doped. It is indicated that the sensitizing effect of Gd3+ for luminescence of Eu3+ obviously. The highest excitation intensity of Na2Sr (MoO4)2: Eu3+, Gd3+ at 466 nm, matching the output wavelengths of blue LED chips.
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