A new white Ca 3−x Si 2 O 7 : xDy 3+ (x=0.03, 0.05, 0.07, 0.10) phosphor with various Dy 3+ concentrations was prepared and its photoluminescent properties were investigated. The XRD results show that the Dy 3+ substitution of Ca 2+ does not change the structure of Ca 3 Si 2 O 7 host for x≤0.10. The SEM image displays that phosphors aggregate obviously, and the shape of the phosphor particle is irregular. The EDX results reveal that the phosphors consist of Ca, Si, O and Dy elements. Luminescence spectra excited by 350nm consist of two characteristic blue and yellow bands, which correspond to 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions of Dy 3+ , respectively. The yellow-to-blue emission intensity ratio under excitation of 350nm increases with the elevated Dy 3+ concentrations, and the evaluated color coordinates of the investigated samples fall in the white light region. The energy transfer style between Dy 3+ ions is dipole–dipole interaction for higher concentration Dy 3+ doped Ca 3 Si 2 O 7 phosphor. The quantum efficiency for x=0.05 sample excited by 365nm is 15.16%.