Method for producing β-sialon fluorescent material

Patent metadata

Field	Value
Publication number	US-10190044-B2
Application number	US-201615228109-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Aug 7, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A method for producing a β-sialon fluorescent material can be provided. The method includes preparing a composition containing silicon nitride that contains aluminium, an oxygen atom, and europium, heat-treating the composition in a rare gas atmosphere or in a vacuum, and contacting the heat-treated composition with a gas containing elemental fluorine.

First claim

What is claimed is:

1. A method for producing a β-sialon fluorescent material, comprising:
providing a composition comprising a material represented by a formula: Si 6-z Al z O z N 8-z :Eu wherein z satisfies 0<z≤4.2;
heat-treating the composition in a rare gas atmosphere or in a vacuum; and
contacting the heat-treated composition with a fluorine-containing gas.

2. The method according to claim 1 , wherein the fluorine containing gas comprises at least one selected from the group consisting of F 2 , CHF 3 , CF 4 , BrF 3 , BrF 5 , NH 4 HF 2 , NH 4 F, SiF 4 , SF 6 , S 2 F 10 , CIF 3 , KrF 2 , XeF 2 , XeF 4 , PF 5 , PF 3 , BF 3 , and NF 3 .

3. The method according to claim 1 , wherein contacting the heat-treated composition with a fluorine-containing gas is performed in presence of an inert gas.

4. The method according to claim 1 , wherein contacting the heat-treated composition with a fluorine-containing gas is performed at a temperature of above 50° C. to less than 500° C.

5. The method according to claim 1 , wherein heat-treating the composition in a rare gas atmosphere or in a vacuum is performed in presence of a europium compound.

6. The method according to claim 1 , wherein heat-treating the composition in a rare gas atmosphere or in a vacuum is performed at a temperature of from 1300° C. to 1600° C.

7. The method according to claim 1 , wherein providing the composition comprises heat-treating a mixture comprising an aluminium compound, a europium compound, and silicon nitride to obtain the composition.

8. The method according to claim 1 , wherein preparing the composition comprises heat-treating a mixture comprising an aluminium compound, a europium compound, and silicon nitride at a temperature of from 1850° C. to 2100° C. to obtain the composition.

9. The method according to claim 1 , further comprising heat-treating the composition in a nitrogen atmosphere before heat-treating the composition in a rare gas atmosphere or in a vacuum.

Assignees

• Nichia Corp

Inventors

• Hosokawa Shoji
• MORIKAWA Motoharu
• Yanagihara Tadayoshi
• Aoyagi Kenichi
• Kaide Takashi

Classifications

• C09K11/0883 Primary

  Arsenides; Nitrides; Phosphides · CPC title

• C09K11/7734 Primary

  Aluminates · CPC title

• C09K11/77348 Primary

  Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides · CPC title