A blue emitting phosphor KNaCa₂(PO₄)₂:Eu²⁺ was synthesized by a high temperature solid state method.Phase formation was determined by X-ray diffraction (XRD) in a Bru ker AXS D8advanced automatic diffractometer with Ni-filtered Cu Kα1radiation (λ=1.5406nm).Steady time resolved luminescence spectra,and excitation and emission spectra were detected by a fluorescence spectrophotometer (Hitachi F-4600).The uniform diffraction pattern means that the phase formation of KNaCa₂(PO₄)_2is not influenced by a little amount of Eu²⁺.Under 399nm radiation excitation, KNaCa₂(PO₄)₂:Eu²⁺ can produce blue emission,and emission extends fro m 400nm to 600nm,and the peak locates at 471nm corresponding to the 4f^65d1→4f⁷ transition of Eu²⁺.For the 471nm emission, the excitation spectrum ranges from 250nm to 450nm,and the peak locates at 399nm,which matches with near ultraviolet region.Under 365nm excitation,emission intensity of KNaCa₂(PO₄)₂:Eu²⁺ is 85% of that of BAM:Eu2+ , while it is highter than that of BAM:Eu²⁺ under 399nm excitation.Moreover,the CIE coordinates of KNaCa₂( PO₄)₂:Eu²⁺ and BAM:Eu²⁺ locate in the blue region,and show the similar values,such as (0. 154,0.154) and (0.141,0.112).The results mean that KNaCa₂(PO₄)₂:Eu²⁺ may be a potential bl ue emitting phosphor for white LEDs.