A series of APF:Mn (A = Cs, Rb, K) phosphors with single phases were obtained via a simple ion exchange method. These phosphors can exhibit red emission with a broad excitation band in the blue region. The optimized concentration of Mn in APF:Mn was determined. The Racah parameters B and C of Mn in APF:Mn were also calculated. The results indicate that Mn in CsPF:Mn experiences the weakest crystal field among APF:Mn. The phosphor CsPF:Mn prepared with the HPF/KMnF molar ratio of 10 : 1 has the strongest red emission and the highest external quantum efficiency of 50.4% among the samples. It has high thermal quenching resistance and its emission intensity at 160 °C is about 1.1 times higher than that at room temperature. This sample also can remarkably improve the color rendering index and decrease the colour rendering index of white light-emitting diodes (w-LEDs). Hence, CsPF:Mn could be used as a red-emitting phosphor for warm w-LEDs.
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