A series of CaLaMgNbO 6 : x Mn 4 + (x = 0.0005, 0.001, 0.003, 0.005, 0.007, 0.009) phosphors were prepared by traditional solid-state method at high temperature. The structure and morphology of the samples were analyzed. The results showed that the prepared CaLaMgNbO 6 : x Mn 4 + (CLMN : x Mn 4 +) phosphors were uniformly dispersed and the particle size was less than 5 μ m. CLMN : Mn 4 + phosphors have the strongest excitation peak at 351 nm, which is caused by the 4 A 2 g → 2 T 2 g transition of Mn 4 + ions. The strongest emission peak is at 697 nm, which is due to the 2 E g → 4 A 2 g level transition of Mn 4 + . The optimum doping concentration is 0.5 mol.% and the mechanism of concentration quenching is the dipole–dipole interaction between Mn 4 + ions. Importantly, CLMN:Mn 4 + sample has good thermal stability ( I 4 2 3 K / I 2 9 8 K = 48.3%). In addition, the color coordinates of all samples were concentrated in the far-red region (0.733, 0.267). The above results indicate that CLMN : Mn 4 + sample has potential application value in the field of white light-emitting diodes (w -LEDs). [ABSTRACT FROM AUTHOR]