A series of the red phosphors KLa1－x(MoO₄)₂:E u³⁺x were prepared under oxidizing atmosphere by solid state method in order to improve their luminescence properties.The effects of H₃BO_3flux on crysta l structure,surface morphology and spectral characteristics of KLa1－x(MoO₄)₂:E u³⁺x phosphors were s ystematically investigated by X-ray diffractometer (XRD),s canning electron microscopy (SEM) and fluorescence spectrophotometer.The result s showed that the addition of activator Eu³⁺ and H₃BO_3flux did not change phase structure of KLa1－x(MoO₄)₂:E u³⁺x.The KLa1－x( MoO₄)₂:Eu³⁺x phosphor can be exc ited effctively by 393nm near-UV light and 463nm blue light,and emits red li g ht.The main emission peak is located at 616nm corresponding to the ⁵D₀→⁷F₂ tr ansition of Eu³⁺.The excitation wavelengths of 393nm and 463nm match wel l wi th near UV and Blue LED chips used widely.It was found that the luminescence int ensity of KLa1－x(MoO₄)₂:E u³⁺x with 5% mass fraction of H₃BO_3is impr oved by 234% than that of the powder without the flux material.The CIE chromaticity coordinates (0.6399,0.3395) is closer to the the Nati onal Television Systems Committee (N TSC) standard (0.67,0.33) than commercial Y₂O₃:Eu³⁺ (0.625,0.338).It c an b e seen that the phosphor has the potential to become a commercial red phosphor.