This study investigated the luminescence properties of novel deep red phosphors Ca14Zn6M10O35:Mn4+ (M = Al3+ and Ga3+). These phosphors efficiently excited using a blue LED light. It exhibited a deep red emission around 713 nm. The luminescence intensities of CZA:Mn-0.03 and CZG:Mn-0.03 excited at 450 nm were, respectively, about 2.2 and 2.7 times higher than that of YAG:Ce3+ (P46). These phosphors also show little temperature quenching, but more than that shown by YAG:Ce3+ at 423 K. These results show that the deep red phosphor Ca14Zn6M10O35:Mn4+ (M = Al3+ and Ga3+) is a beneficial phosphor for use in indoor plant cultivation.