Red phosphor, preparation method thereof and light-emitting device prepared therefrom

Patent metadata

Field	Value
Publication number	US-11680203-B2
Application number	US-201716612299-A
Country	US
Kind code	B2
Filing date	Oct 18, 2017
Priority date	May 15, 2017
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

The present invention relates to a red phosphor, a preparation method thereof and a light-emitting device prepared therefrom. A particle of the red phosphor consists of a phosphor inner core having a chemical formula of A x1 Ge z1 F 6 :y 1 Mn 4+ and an outer shell having a chemical formula of B x2 M z2 F 6 :y 2 Mn 4+ , wherein 1.596≤x 1 ≤2.2, 1.6≤x 2 ≤2.2, 0.001≤y 1 ≤0.2, 0≤y 2 ≤0.2, 0.9≤z 1 ≤1.1, and 0.9≤z 2 ≤1.1; A and B are independently selected from alkali metal elements; and M is Si, or Si and Ge. The red phosphor provided by the present invention has high luminous efficiency and stability. Moreover, the phosphor alone or in combination with other luminescent materials can be used for preparing a light-emitting device with high performance.

First claim

What is claimed is:

1. A red phosphor, wherein a particle of the red phosphor consists of a phosphor inner core having a chemical formula of A x1 Ge z1 F 6 :y 1 Mn 4+ and an outer shell having a chemical formula of B x2 M z2 F 6 :y 2 Mn 4+ , wherein 1.596≤x 1 ≤2.2, 1.6≤x 2 ≤2.2, 0.1<y 1 ≤0.2, 0<y 2≤0.2, 0.9 ≤z 1 ≤1.1, 0.9≤z 2≤1.1 ; A and B are independently selected from alkali metal elements; and M is Si and Ge, and a molar ratio m of Si to M in the outer shell meets the following condition:
0.5≤m<1;
the outer shell has a thickness of 0.5 μm to 15 μm.

2. The red phosphor according to claim 1 , wherein A and B are independently selected from Li, Na and K.

3. The red phosphor according to claim 1 , wherein a molar ratio n of Mn to M in the outer shell meets the following condition: 0<n≤0.1.

4. The red phosphor according to claim 3 , wherein 0.5≤m<1, and 0<n≤0.05.

5. The red phosphor according to claim 1 , wherein the particle size of the red phosphor is 5 μm to 45 μm.

6. The red phosphor according to claim 1 , wherein the outer shell has a thickness of 2 μm to 5 μm, and the particle size of the red phosphor is 15 μm to 35 μm.

7. A preparation method of the red phosphor of claim 1 , comprising:
(1) performing dosing based on A x1 Ge z1 F 6 :y 1 Mn 4+ , separately dissolving compounds that contain A, Ge and Mn in a 30-50 wt % hydrofluoric acid solution at 10° C. to 50° C., performing mixing, and sieving, washing and drying an obtained precipitate to obtain powder of an A x1 Ge z1 F 6 :y 1 Mn 4+ phosphor inner core;
(2) performing dosing based on B x2 M z2 F 6 :y 2 Mn 4+ wherein M is Si and Ge, separately dissolving compounds that contain A and M, or compounds that contain A, M and Mn in a 30-50 wt % hydrofluoric acid solution at 10° C. to 50° C., and performing mixing to obtain a mother liquid material; and
(3) adding the powder of the phosphor inner core obtained in step (1) into the mother liquid material obtained in step (2), performing stirring to obtain a precipitate, and sieving, washing and drying the obtained precipitate to obtain the red phosphor.

8. The preparation method according to claim 7 , wherein the stirring in step (3) is performed for 2 minutes to 60 minutes.

9. A light-emitting device, comprising the red phosphor of claim 1 .

10. The light-emitting device according to claim 9 , further comprising a radiation source, and the radiation source is a semiconductor light-emitting chip, wherein the semiconductor light-emitting chip is an LED chip with an emission peak wavelength of 440 nm to 470 nm.

11. The red phosphor according to claim 2 , wherein the particle size of the red phosphor is 5 μm to 45 μm.

12. The red phosphor according to claim 3 , wherein the particle size of the red phosphor is 5 μm to 45 μm.

13. The red phosphor according to claim 4 , wherein the particle size of the red phosphor is 5 μm to 45 μm.

14. The red phosphor according to claim 2 , wherein the outer shell has a thickness of 2 μm to 5 μm, and the particle size of the red phosphor is 15 μm to 35 μm.

15. The red phosphor according to claim 3 , wherein the outer shell has a thickness of 2 μm to 5 μm, and the particle size of the red phosphor is 15 μm to 35 μm.

16. The red phosphor according to claim 1 , wherein A and B are K.

17. The red phosphor according to claim 1 , wherein the outer shell has a thickness of 1 μm to 12 μm; and the particle size of the red phosphor is 10 μm to 40 μm.

18. The red phosphor according to claim 3 , wherein the outer shell has a thickness of 1 μm to 12 μm; and the particle size of the red phosphor is 10 μm to 40 μm.

19. The red phosphor according to claim 2 , wherein a molar ratio n of Mn to M in the outer shell meets the following condition: 0<n≤0.1.

20. The red phosphor according to claim 16 , wherein the particle size of the red phosphor is 5 μm to 45 μm.

Assignees

• Grirem Advanced Mat Co Ltd

Inventors

• Liu Ronghui
• Chen Guantong
• Liu Yuanhong
• Ma Xiaole

Classifications

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title

• H01L33/502

  Electricity · mapped topic

• C09K11/677 Primary

  Germanates · CPC title

• H10H20/8513

  having two or more wavelength conversion materials · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title