High-performance narrowband fluorescent powder and preparation method thereof

[0040] Embodiment 1~4

[0041] This example provides Cs 2 SiF 6 : Mn 4+ The phosphor is prepared by the following preparation method.

[0042] (1) K 2 MnF 6 preparation

[0043] K was prepared according to the method described in Angew. Chem-Ger. Edit. 65, 304-304 (1953) 2 MnF 6 crystal.

[0044] Put 0.45 g KMnO 4 and 9 g KHF 2 Dissolved in 30 ml of hydrofluoric acid (49%), stirred for 30 minutes, and then gradually added dropwise about 1.2 ml of hydrogen peroxide (30 wt.%), a yellow precipitate was gradually formed in the solution, and the solution was filtered to obtain the precipitate, and acetone was used to obtain the precipitate. After cleaning, bake at 80°C for 2 hours to obtain K 2 MnF 6 .

[0045] Each embodiment starts with K 2 MnF 6 As the manganese source, other manganese sources, such as cesium hexafluoromanganate, also have the same effect.

[0046] (2) Cs before passivation 2 SiF 6 : Mn 4+ Preparation of phosphors

[0047] A certain amount of po

[0053] Embodiment 5~6

[0054] Example 5 is the same as Example 3 except that the selected silicon-containing compound is ethyl orthosilicate (0.5208 g). Prepared Cs 2 SiF 6 :Mn 4+ The properties of the phosphor are similar to those of Example 3.