Phosphor for light-emitting device

Patent metadata

Field	Value
Publication number	US-9309459-B2
Application number	US-201214377071-A
Country	US
Kind code	B2
Filing date	Aug 9, 2012
Priority date	Feb 9, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A high-brightness phosphor having high-temperature characteristics and long-term reliability, and a white light-emitting device using this phosphor are provided. The phosphor contains a silicate phosphor (A) having a peak wavelength of at least 525 nm but not higher than 535 nm and fluorescence intensity of at least 250% but not higher than 270%; an oxynitride phosphor (B) having a peak wavelength of at least 540 nm but not higher than 545 nm and fluorescence intensity of at least 260% but not higher than 280%; and an oxynitride phosphor (C) having a peak wavelength of at least 645 nm but not higher than 655 nm, wherein the amount of the silicate phosphor (A) is at least 20% but not higher than 35% by mass, the amount of the oxynitride phosphor (B) is at least 50% but not higher than 70% by mass, and the amount of the oxynitride phosphor (C) is at least 10% but not higher than 20% by mass.

First claim

What is claimed is:

1. A phosphor, comprising: a silicate phosphor (A) having a peak wavelength of at least 525 nm but not higher than 535 nm and fluorescence intensity of at least 250% but not higher than 270%;
an oxynitride phosphor (B) having a peak wavelength of at least 540 nm but not higher than 545 nm and fluorescence intensity of at least 260% but not higher than 280%; and
an oxynitride phosphor (C) having a peak wavelength of at least 645 nm but not higher than 655 nm,
wherein, the amount of the silicate phosphor (A) is at least 20% but not higher than 35% by mass; the amount of the oxynitride phosphor (B) is at least 50% but not higher than 70% by mass; and the amount of the oxynitride phosphor (C) is at least 10% but not higher than 20% by mass.

2. The phosphor as set forth in claim 1 , wherein assuming the amounts of the silicate phosphor (A) and that of the oxynitride phosphor (B) are a and b, respectively, the ratio satisfies 1.5≦b/a≦3.5.

3. The phosphor as set forth in claim 1 , wherein assuming the amounts of the silicate phosphor (A) and that of the oxynitride phosphors (B)and (C) of the phosphor are a, b, and c, respectively, the ratio satisfies 4.0≦(a+b)/c≦8.2.

4. The phosphor as set forth in claim 1 , wherein the oxynitride phosphor (B) is β-SiAlON, and the oxynitride phosphor (C) is CASN.

5. The phosphor as set forth in claim 3 , wherein the oxynitride phosphor (B) is β-SiAlON, and the oxynitride phosphor (C) is CASN.

Assignees

• Kobayashi Keita
• Fushii Yasuhito
• Ichikawa Kohki
• Yamada Suzuya
• Emoto Hideyuku
• Denka Company Ltd

Inventors

• Kobayashi Keita
• Fushii Yasuhito
• Ichikawa Kohki
• Yamada Suzuya
• Emoto Hideyuku

Classifications

• C09K11/0883 Primary

  Arsenides; Nitrides; Phosphides · CPC title

• H10H20/8513

  having two or more wavelength conversion materials · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• Y02B20/181

  Cross-Sectional Technologies · mapped topic

• C09K11/59

  containing silicon · CPC title