Reduction-coprecipitation preparation method and application of (NH4) 2MnF6

The invention belongs to the technical field of fluorescent materials, and discloses a reduction-coprecipitation preparation method and application of (NH4) 2MnF6. The preparation method comprises the following steps: adding KMnO4 and NH4HF2/NH4F into hydrofluoric acid to obtain a system A; adding an H2O2 solution into the system A according to the following mode (i) or (ii) to obtain a system B; the mode (i) is that the H2O2 solution is added once every 3 minutes, and 20-30 L of H2O2 solution is added each time; mode (ii): firstly, 0.2-0.5 mL of H2O2 solution is added once every 1 min, and the total adding amount is 1-1.5 mL; after stirring for 20-30 minutes, adding the H2O2 solution once every 3 minutes, and adding 20-30 L of the H2O2 solution every time; and carrying out solid-liquid separation on the system B, collecting solid-liquid separated precipitates, washing and drying to obtain a target product. A reduction-coprecipitation method is adopted, the requirements for equipment and synthesis conditions