Ce 3+ and Mn 2+ co-doped Ca 4 Si 2 O 7 F 2 phosphors have been synthesized by high temperature solid state reaction and their luminescence properties are investigated. The effect of Ce 3+ concentration on the emission intensity of Ca 4 Si 2 O 7 F 2 : Ce 3+ is studied, and the emission intensity reaches a maximum at 4% Ce 3+ . Energy transfer from Ce 3+ to Mn 2+ is observed. The emission spectra of the phosphors show a blue broad band at 460nm of Ce 3+ and a yellow band at 580nm of Mn 2+ , originate from the allowed 5d→4f transition of the Ce 3+ ion and the 4 T 1g ( 4 G)→ 6 A 1g ( 6 S) transition of the Mn 2+ ion, respectively. Results indicate that the varied emitted color from blue to yellow can be achieved by tuning the relative ratio of the Ce 3+ to Mn 2+ ions based on the principle of energy transfer. We have demonstrated that Ca 4 Si 2 O 7 F 2 : Ce 3+ , Mn 2+ phosphors can be a promising candidate for a color-tunable phosphor applied in a near-UV White light emitting diodes.