# US 2014/0191159 A1 · Method of stabilizing alph-sialon phosphor raw powder, alph-sialon phosphor composition obtained therefrom, and method of manufacturing alpha-sialon phosphor

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- Number: US 2014/0191159 A1
- Document ID: US20140191159A1
- Status: Published application
- Kind: A1
- Application number: 13/761,110
- Filed: 2013-02-06
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: Korea Institute of Machinery & Materials
- Inventors: Jin Myung KIM; Jae Wook LEE; Young Jo PARK
- Web page: https://patentgrep.com/patent/US20140191159A1

## CPC

- C09K 11/0883: {Arsenides; Nitrides; Phosphides}
- C09K 11/77348: {Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

Disclosed herein is a method of stabilizing alpha-sialon phosphor raw powder, including the steps of: mixing alpha-sialon phosphor raw powder including Si3N4, AlN, a rare-earth metal oxide and calcium nitride (Ca3N2) as a calcium source and having Composition Formula represented by CaxSi12−m−nAlm+nOnN16−n:Rey (here, Re is an activator and is at least one selected from the group consisting of Eu, Ce, Tb, Yb, Sm and Dy, 0.3≦m≦1.0, 0.02≦y≦0.15, m=2x+3y); and heat-treating the alpha-sialon phosphor raw powder to convert the calcium source into a Ca—Al—Si—N based compound. This method is advantageous in that a reliable alpha-sialon phosphor having high photoluminescence intensity can be manufactured regardless of weather, season, environment and the like.

## Claims

### Claim 1

A method of stabilizing alpha-sialon phosphor raw powder, comprising the steps of:
mixing alpha-sialon phosphor raw powder including Si3N4, AlN, a rare-earth metal oxide and calcium nitride (Ca3N2) as a calcium source and having Composition Formula represented by CaxSi12−m−nAlm+nOnN16−n:Rey (here, Re is an activator and is at least one selected from the group consisting of Eu, Ce, Tb, Yb, Sm and Dy, 0.3≦m≦1.0, 0.02≦y≦0.15, m=2x+3y); and
heat-treating the alpha-sialon phosphor raw powder to convert the calcium source into a Ca—Al—Si—N based compound.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of converting the calcium source into a Ca—Al—Si—N based compound is performed at a temperature of 1000° C. or more under a nitrogen atmosphere.

### Claim 3 (depends on 2)

The method of claim 2, wherein the step of converting the calcium source into the Ca—Al—Si—N based compound is performed at a temperature of 1000˜1250° C. under a nitrogen atmosphere.

### Claim 4 (depends on 1)

The method of claim 1, wherein a mixing apparatus for performing the step of mixing the alpha-sialon phosphor raw powder and a heat treatment apparatus for the step of converting the calcium source into the Ca—Al—Si—N based compound communicate with each other under a nitrogen atmosphere.

### Claim 5 (depends on 1)

The method of claim 1, wherein the Ca—Al—Si—N based compound includes CaAlSiN3.

### Claim 6

A method of manufacturing an alpha-sialon phosphor, comprising the steps of:
mixing Si3N4, AlN, a rare-earth metal oxide and a Ca—Al—Si—N based compound to prepare Composition Formula represented by CaxSi12−m−nAlm+nOnN16−n:Rey (here, Re is an activator and is at least one selected from the group consisting of Eu, Ce, Tb, Yb, Sm and Dy, 0.3≦m≦1.0, 0.02≦y≦0.15, m=2x+3y); and
sintering the mixture.

### Claim 7

An alpha-sialon phosphor composition, comprising Si3N4, AlN, a rare-earth metal oxide and a Ca—Al—Si—N based compound and represented by CaxSi12−m−nAlm+nOnN16−n:Rey (here, Re is an activator and is at least one selected from the group consisting of Eu, Ce, Tb, Yb, Sm and Dy, 0.3≦m≦1.0, 0.02≦y≦0.15, m=2x+3y).