“In the field of Micro LED display technology, researchers have developed a novel precipitation synthesis method for submicron K2SiF6: Mn4+phosphors. The fluorescent powder exhibits high efficiency Mn4+red luminescence under 450 nm blue light excitation, with an internal quantum efficiency of up to 94.9% and a particle size distribution between 150 and 450 nm. Its thermal quenching performance is excellent, and it can maintain 102% of the room temperature luminescence intensity. The white LED produced by mixing green fluorescent powder and coating it on a blue light chip has a color gamut coverage range of 133% NTSC and stable performance. This study provides a new method for the synthesis of submicron sized K2SiF6: Mn4+phosphors, which is expected to promote the development of Micro LED display technology.”