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YW2O6(OH)3:Tb3+ green phosphors were synthesized at different pH values via a facile hydrothermal method.The structure and optical properties of as-synthesized samples were studied by X-my diffractometer (XRD),scanning electron microscopy (SEM),photoluminescence spectra and luminescence decay curve.The results showed that pure monoclinic YW2O6(OH)3:Tb3+ green phosphors could be obtained at pH 2-5.Uniform spherical micro-phosphors of～5 μin in diameter with narrow size distribution could be prepared at pH 5.pH value had dramatic influence on morphologies,which could be ascribed to the various spatial configurations of different poly-tungstates existing at different pH values.The emission spectra under 261 nm excitation exhibited dominant green emission at 546 nm.The green emission intensity reached the maximum value at pH 5 due to the high packing density of the obtained phosphor.