Y_(0.6)Gd_(0.4)NbO_4:Eu~(3+)/Tb~(3+) mol percent phosphors with different dopant concentrations have been synthesized by a modified wet-chemical technology named as in-situ chemical co-precipitation from multicomponcnt hybrid precursors. Their microstructure, micromorphology and particle sizes have been analyzed by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). Those phosphors present interesting morphology, just like "cobblestone" with about 1.0 mu m in dimension. Besides this, the dependence of the Red to Orange (RO) emission for Eu~(3+) and the Green to Blue (GB) emission for Tb~(3+) in Y_(0.6)Gd_(0.4)NbO_4 host together with other fluorescent properties on the activator concentration has been discussed. It was shown that the RO value of Eu~(3+) varies much with the doping concentration, but the GB value of Tb~(3+) almost remains constant.
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