Blue-emitting Ba1-xSi2O2N2xEu2+(0.01≤x≤0.08) phosphor has been synthesized via an ultrasonic suspension route. The microstructure and photoluminescence properties of the as-synthesized phosphor are characterized by X-ray diffraction (XRD) and photoluminescence spectroscopy, respectively. Its XRD pattern indicates that the BaSi2O2N2Eu2+is the major crystalline phase for all compositions. It can be efficiently excited over a broad excitation band extending from 287 to 460 nm。The BaSi2O2N2Eu2+phosphor has strong blue emission. The emission spectrum consists of a single-peak broadband with a maximum at 487 nm, which may be ascribed to the 4f65d→4f7transition of Eu2+. A larger Stokes shift of Eu2+luminescence is expected at the excitation wavelength of 303 nm than at 397 nm due to nonradiative relaxation. The luminescence intensity is enhanced and a red shift is observed upon increasing Eu2+concentration. When x exceeds 0.02, the emission intensity tends to monotonically decrease due to the Eu2+concentration quenching. This new phosphor has promising applications in phosphor-converted white LED.