Fluoride phosphor composite, method of manufacturing fluoride phosphor composite, white light emitting apparatus, display apparatus, lighting device, and electronic device

Patent metadata

Field	Value
Publication number	US-10851294-B2
Application number	US-201715719724-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Dec 9, 2014
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

There is provided a fluoride phosphor composite including: fluoride phosphor core particles that may be expressed by the empirical formula AxMFy:Mn4+, wherein A may be at least one selected from the group consisting of Li, Na, K, Rb, and Cs, M may be at least one selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, the composition ratio (x) of A may satisfy 2≤x≤3, the composition ratio (y) of F may satisfy 4≤y≤7, each fluoride phosphor composite particle may be coated with a Mn-free fluoride coating. The Mn-free fluoride coating may have a thickness less than or equal to 35% of the size of each fluoride phosphor composite particle.

First claim

What is claimed is:

1. A method for preparing fluoride phosphor composite particles, the method comprising:
preparing a hydrofluoric (HF) solution including introducing a first source material containing M to the HF solution and introducing a fluoride containing Mn4+ to the HF solution;
introducing a second source material containing A to the HF solution to synthesize fluoride phosphor core particles in the HF solution, the synthesized fluoride phosphor core particles being expressed by an empirical formula of AxMFy:Mn4+, wherein one of the first and second source materials remains after the fluoride phosphor core particles are synthesized; and
additionally introducing the other of the first and second source materials to the HF solution with the fluoride phosphor core particles formed therein, to coat the fluoride phosphor core particles with an Mn-free fluoride shell,
wherein M is at least one selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, A is at least one selected from the group consisting of Li, Na, K, Rb, and Cs, the composition ratio (x) of A satisfies 2≤x≤3, and the composition ratio (y) of F satisfies 4≤y≤7.

2. The method of claim 1 , further comprising:
collecting the fluoride phosphor composite particles coated with the Mn-free fluoride shell; and
introducing the fluoride phosphor composite particles and an organic material to a solvent to coat a surface of the Mn-free fluoride shell with the organic material.

3. The method of claim 2 , wherein the solvent is acetone, and the organic material includes a hydrophobic organic material that can be physically adsorbed on a surface of each fluoride phosphor composite particle.

4. The method of claim 2 , wherein a mole ratio of the organic material to the fluoride phosphor composite particles ranges from 1 to 4.

5. The method of claim 2 , further comprising: cleaning the fluoride phosphor composite particles between the collecting of the fluoride phosphor composite particles and the coating of the surface of the fluoride shell with the organic material.

6. The method of claim 2 , further comprising: cleaning the fluoride phosphor composite particles coated with the organic material,
wherein the cleaning is performed two or fewer times.

7. The method of claim 1 , wherein the preparing of the HF solution includes introducing the fluoride containing Mn4+ to the HF solution including the first source material.

8. The method of claim 1 , wherein the Mn4+-contained fluoride includes a manganese fluoride having a composition of AxMnFy.

9. The method of claim 1 , wherein the first source material includes at least one selected from the group consisting of HxMFy, AxMFy, and MO2.

10. The method of claim 9 , wherein the second source material includes AHF2.

11. The method of claim 10 , wherein after the fluoride phosphor core particles are synthesized, the second source material remains in the HF solution, and the coating of the fluoride phosphor core particles with the Mn-free fluoride shell includes introducing the first source material to the HF solution to produce the Mn-free fluoride shell of the fluoride phosphor core particles via a reaction of first source material and the second source material in the HF solution.

12. The method of claim 1 , wherein the Mn-free fluoride shell includes a fluoride expressed by an empirical formula of AxMFy.

13. The method of claim 1 , wherein fluoride phosphor core particles are formed by precipitation resulting from the introducing the second source material containing A to the HF solution.

14. The method of claim 1 , wherein the step of additionally introducing the other of the first and second source materials to the HF solution causes a reaction of the first and second source materials in the HF solution to produce a Mn-free material that coats the phosphor core particles to form the Mn-free fluoride shells.

15. The method of claim 1 , wherein manganese ions within the HF solution are substantially exhausted as a result of synthesizing the fluoride phosphor core particles in the HF solution.

16. A method for preparing fluoride phosphor composite particles, the method comprising:
preparing a hydrofluoric (HF) solution having a first source material containing M and having a fluoride containing Mn4+;
introducing a second source material containing A to the HF solution to synthesize fluoride phosphor core particles in the HF solution, the synthesized fluoride phosphor core particles being expressed by an empirical formula of AxMFy:Mn4+, wherein one of the first and second source materials remains after the fluoride phosphor core particles are synthesized;
additionally introducing the other of the first and second source materials to the HF solution with the fluoride phosphor core particles formed therein, to coat the fluoride phosphor core particles with an Mn-free fluoride shell,
cleaning the fluoride phosphor core particles with the Mn-free fluoride shell; and
introducing the fluoride phosphor core particles with the Mn-free fluoride shell and an organic material to a solvent to coat the fluoride phosphor core particles with the organic material,
wherein M is at least one selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, A is at least one selected from the group consisting of Li, Na, K, Rb, and Cs, a composition ratio (x) of A satisfies 2≤x≤3, and a composition ratio (y) of F satisfies 4≤y≤7.

17. The method of claim 16 , wherein the Mn4+-contained fluoride includes a manganese fluoride having a composition of AxMnFy and the Mn-free fluoride shell includes a fluoride expressed by an empirical formula of AxMFy.

18. The method of claim 17 , wherein the second source material includes AHF2.

19. The method of claim 16 , wherein after the fluoride phosphor core particles are synthesized, the second source material remains in the HF solution, and the coating of the fluoride phosphor core particles with the Mn-free fluoride shell includes introducing the first source material to the HF solution to produce the Mn-free fluoride shell of the fluoride phosphor core particles via a reaction of first source material and the second source material in the HF solution.

20. The method of claim 16 , wherein fluoride phosphor core particles are formed by precipitation resulting from the introducing the second source material containing A to the HF solution.

21. The method of claim 16 , wherein the step of additionally introducing the other of the first and second source materials to the HF solution causes a reaction of the first and second source materials in the HF solution to produce a Mn-free material that coats the phosphor core particles to form the Mn-free fluoride shells.

Assignees

• Samsung Electronics Co Ltd

Inventors

• You Ji Ho
• Lee In Hyung
• Kim Tae Hoon
• Park Jong Won
• Yoon Chul Soo
• Lee Chi Woo

Classifications

• H10H20/8512

  Wavelength conversion materials · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• H05B33/14

  characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} · CPC title

• C09K11/08 Primary

  containing inorganic luminescent materials · CPC title

• C09K11/617 Primary

  Silicates · CPC title