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In this work,novel phosphors NasGd(WO4)4:Tb3+/Yb3+ and Na5Gd(WO4)4:Tb3+/Er3+/Yb3+ phosphors were synthesized by the solid state reaction method.The photoluminescence properties were investigated.The introduction of Er3+ to NGW:Tb3+/Yb3+ was used to modify the chromaticity coordinates,then providing a good color tunable property.The change in the chromaticity coordinates induces the shift of emission color from yellow-green to blue-green for NGW:Tb3+/Er3+/Yb3+ as the temperature increases.All the results indicate that the NGW:Er3+/Tb3+/Yb3+ phosphors may be used as optical temperature sensing materials.