Patent ID: 11939503
Assignee: HEFEI UNIVERSITY OF TECHNOLOGY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 3:
4. The preparation method for the manganese-doped red phosphor according to claim 1, wherein a preparation method for A2MnF6 in the step 4) comprises:
A: dissolving potassium hydrogen fluoride in a hydrofluoric acid, a mass concentration of the hydrofluoric acid is 30% to 59%, wherein a mass ratio of the potassium hydrogen fluoride to the hydrofluoric acid is 2:10 to 4:10; and at a revolving speed of 10 RPM to 1000 RPM, stirring for 15 minutes to 40 minutes;
B: adding potassium permanganate while stirring, wherein a mass ratio of the potassium permanganate to the potassium hydrogen fluoride is 1:5 to 2:5;
C: using a hydrogen peroxide to titrate solution after adding the potassium permanganate to be golden yellow, a mass concentration of the hydrogen peroxide is 25% to 40%;
D: putting the titrated solution together with a reactor into an ice-water mixture at 0° C. to 5° C. and standing for 15 minutes to 40 minutes, filtering out a precipitate, and then using acetone to repeatedly wash the precipitate to be neutral; and
E: drying the washed precipitate for 1 hour to 4 hours under conditions of a temperature of 60° C. to 90° C. and a vacuum degree of 90 Pa to 500 Pa, to obtain A2MnF6.