Disclosed herein are phosphor compositions which can exhibit a broad emission spectrum and improved color rendering index (CRI) relative to conventional phosphor materials. The phosphor compositions may, in some embodiments, be represented by the Formula I: (RE2−x+yCexAk1−y)(MG4−z−rSirMnz)(Si1−ePe)O12−rNr, wherein RE comprises at least one rare earth metal; Ak comprises at least one alkaline earth metal; MG comprises at least one main group element; x is greater than 0 and less than or equal to 0.2; y is less than 1; z is greater than 0 and less than or equal to 0.8; e is about 0 or less than or equal to 0.16; r is about 0 or less than or equal to 1; and z is about the sum of e and y. Also disclosed herein are lighting apparatuses including the phosphor compositions, as well as methods of making and using the phosphor compositions.