Blue emitting phosphor SrZn_2(PO_4)_2:Eu~(2+) is synthesized by a high temperature solid state method,and the luminescent properties are investigated.At the 330 nm radiation excitation,SrZn_2(PO_4)_2:Eu~(2+) presents an emission band at 416 nm,which is assigned to the 4f~65d~1→4f~7 transition of Eu~(2+) ion.The concentration quenching effect of Eu~(2+) in SrZn_2(PO_4)_2has been validated and proved to be a resonant type via a dipole-dipole interaction.The critical distance(R_c) of Eu~(2+) in SrZn_2(PO_4)_2 is calculated to be 3.244 nm.The Commission International de I’Eclairage(CIE) chromaticity coordinates of SrZn_2(PO_4)_2:Eu~(2+) locate at the blue region,such as(0.150,0.072).The results indicate that the SrZn_2(PO_4)_2:Eu~(2+)phosphor may have potential applications in white light emitting diodes(LEDs). Abstract: The blue emitting phosphor SrZn_2 (PO_4) _2: Eu ~ (2+) is synthesized by a high temperature solid state method, and the luminescent properties are investigated. At the 330 nm radiation excitation, SrZn_2 (PO_4) ) presents an emission band at 416 nm, which is assigned to the 4f~65d~1 → 4f~7 transition of Eu~ (2+) ion. The concentration quenching effect of Eu~ (2+) in SrZn_2 (PO_4) _2has was validated and proved to be a resonant type via a dipole-dipole interaction. The critical distance (R_c) of Eu 2+ in SrZn_2 (PO_4) _2 is calculated to be 3.244 nm. The Commission International de I’Eclairage ( CIE) chromaticity coordinates of SrZn_2 (PO_4) _2: Eu ~ (2+) locate at the blue region, such as (0.150,0.072). The results indicate that the SrZn_2 (PO_4) _2: Eu ~ (2+) have potential applications in white light emitting diodes (LEDs).