A red emitting phosphor Ba 2 SiO 4 :Eu 3+ is synthesized by a high temperature solid-state reaction, and its luminescent properties are investigated. Ba 2 SiO 4 :Eu 3+ phosphor has two regions in the excitation spectrum, one is assigned to the charge transfer state (CTS) band at about 285nm, and the other originates from the intra-4f transitions at 350–500nm. It can be effectively excited by 392nm radiation excitation, and exhibit a series of sharp peaks. The strongest emission locates at 616nm which attributes to the 5 D 0 – 7 F 2 transition of Eu 3+ , and the CIE chromaticity coordination is (0.629, 0.361). Effect of Eu 3+ doped content on the emission intensity and the concentration quenching of Eu 3+ in Ba 2 SiO 4 :Eu 3+ are investigated. The results show that the optimum doped content is 2mol% Eu 3+ , and the concentration quenching mechanism is the dipole–dipole interaction, and the critical energy transfer distance is approximately 2.197nm. When codoped K + , the emission intensity of Ba 2 SiO 4 :Eu 3+ can be further enhanced, and the optimum doped content is 2mol% K + .