METHOD FOR PREPARING MANGANESE-DOPED RED FLUORESCENT POWDER, PRODUCT, DEVICE, AND BACKLIGHT MODULE

摘要

Disclosed in the present invention are a method for preparing manganese-doped red fluorescent powder, a device comprising a product, and a backlight module. The method comprises: 1) mixing A₂BF₆ polycrystalline particles with mill balls; 2) mixing A₂BF₆ powder obtained by ball milling with hydrofluoric acid for secondary crystallization; 3) filtering solid particles in a A₂BF₆ and hydrofluoric acid solution subjected to secondary crystallization; 4) performing ion exchange between A₂BF₆ particles and A₂MnF₆; and 5) filtering solid particles to obtain a filter cake, and performing drying treatment to obtain manganese-doped red fluorescent powder.