# US 2014/0197362 A1 · LI-CONTAINING --a-- or --ALPHA-- SIALON-BASED PHOSPHOR, PRODUCTION PROCESS THEREOF, LIGHTING DEVICE AND IMAGE DISPLAY DEVICE

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- Number: US 2014/0197362 A1
- Document ID: US20140197362A1
- Status: Published application
- Kind: A1
- Application number: 14/217,816
- Filed: 2014-03-18
- Published: 2014-07-17
- Earliest claimed: 2008-08-13
- Assignees: Ube Industries, Ltd.
- Inventors: Ube Industries LTD
- Web page: https://patentgrep.com/patent/US20140197362A1

## CPC

- C09K 11/7728: {containing europium}
- C09K 11/0883: {Arsenides; Nitrides; Phosphides}
- C09K 11/77348: {Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides}
- H10H 20/8512: {Wavelength conversion materials}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

An Li-containing α-sialon-based phosphor represented by the formula (1): LixEuySi12−(m+n)Al(m+n)On+δN16−n−δ (wherein assuming that average valence of Eu is a, x+ya+δ=m; 0.455≦x<1.2, 0.001≦y≦0.2, 0.9≦m≦2.5, 0.5≦n≦2.4, and δ>0).

## Claims

### Claim at position 1

1-20. (canceled)

### Claim 21

A process of producing an Li-containing α-sialon-based phosphor represented by formula (1):
LixEuySi12−(m+n)Al(m+n)On+δN16−n−δ (1)
wherein, assuming that average valence of Eu is a, x+ya+δ=m; 0.45≦x<1.2, 0.001≦y≦0.2, 0.9≦m≦2.5, 0.5≦n≦2.4, and δ>0;
the process comprising:
i) weighing and mixing
a silicon nitride powder and/or a nitride-containing silane compound,
an aluminum source containing at least aluminum nitride,
a nitride, oxynitride or oxide of Li or a precursor substance capable of becoming an oxide of Li by pyrolysis, and
a nitride, oxynitride or oxide of Eu or a precursor substance capable of becoming an oxide of EU by pyrolysis, to produce a composition of the Li-containing α-sialon-based phosphor represented by formula (1) provided that lithium is contained in an amount in excess over a theoretical amount of Li in the Li-containing α-sialon-based phosphor represented by formula (1) by 0.1 mole or more per 1 mole of the Li-containing α-sialon-based phosphor, and
ii) firing a mixture obtained by said mixing at 1,400 to 1,800° C. in a nitrogen-containing inert gas atmosphere under atmospheric pressure.

### Claim 22 (depends on 21)

The process of claim 21, wherein the Li-containing α-sialon-based phosphor after said firing is subjected to acid washing.

### Claim 23 (depends on 21)

The process of claim 21, wherein said silicon nitride powder and/or a nitride-containing silane compound is an amorphous silicon nitride powder and/or a nitride-containing silane compound, by which is produced a powder of the Li-containing α-sialon-based phosphor in which an average aspect ratio of primary particles as measured by image analysis of a scanning electron micrograph is 2 or less and average particle diameter Dparticle of the primary particles is 1 to 3.0 μm.

### Claim 24 (depends on 21)

The process of claim 21, further comprises
i) weighing and mixing
a) an amorphous silicon nitride powder and/or a nitride-containing silane compound as the silicon nitride powder and/or a nitride-containing silane compound,
b) the aluminum source containing at least aluminum nitride,
c) the nitride, oxynitride or oxide of Eu or a precursor substance capable of becoming an oxide of Eu by pyrolysis, and
d) the nitride, oxynitride or oxide of Li or a precursor substance capable of becoming an oxide of Li by pyrolysis, and
wherein said components a) to d) are in amounts which give the theoretical amounts thereof in the Li-containing α-sialon-based phosphor represented by formula (1), and further
e) an oxide of Li or a precursor substance capable of becoming an oxide of Li by pyrolysis in an amount of 0.1 mole or more per 1 mole of the Li-containing α-sialon-based phosphor; and
ii) firing a mixture obtained by said mixing at 1,500 to 1,800° C. in a nitrogen-containing inert gas atmosphere under atmospheric pressure;
to obtain a powder of the Li-containing α-sialon-based phosphor in which an aspect ratio of primary particles as measured by image analysis of a scanning electron micrograph is 3 or less and a length of short axis of the primary particles is more than 3 μm.

### Claim 25 (depends on 24)

The process of claim 24, wherein an excess amount over said theoretical amount of metal lithium in the oxide of Li or the precursor substance capable of becoming an oxide of Li by pyrolysis is 0.1 to 1.25 moles for 1 mole of Li in the Li-containing α-sialon-based phosphor as a theoretical product represented by formula (1).