Phosphor and light-emitting device

Patent metadata

Field	Value
Publication number	US-9337399-B2
Application number	US-201414529788-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	Dec 21, 2009
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A phosphor has the general formula (M 2 x ,M 3 y ,M 4 z ) m M 1 O 3 X (2/n) , wherein M 1 represents at least one element including at least Si and selected from the group consisting of Si, Ge, Ti, Zr, and Sn, M 2 represents at least one element including at least Ca and selected from the group consisting of Ca, Mg, Cd, Co, and Zn, M 3 represents at least one element including at least Sr and selected from the group consisting of Sr, Ra, Ba, and Pb, X represents at least one halogen element, M 4 represents at least one element including at least Eu 2+ and selected from the group consisting of rare-earth elements and Mn, m is in the range 1≦m≦4/3, n is in the range 5≦n≦7, and x, y, and z are each in such a range as to satisfy x+y+z=1, 0.45≦x≦0.8, 0.05≦y≦0.45, and 0.45, and 0.03≦z≦0.35.

First claim

What is claimed is:

1. A light-emitting device, comprising:
a light-emitting element which emits ultraviolet light or short-wavelength visible light;
a first phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light; and
a second phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light of a color different from that of the visible light emitted from the first phosphor,
the light-emitting device being configured to produce a mixed color by mixing light beams from the respective phosphors and configured to emit light with a color temperature of 3,200 K or less, wherein
the first phosphor has the general formula (M 2 x ,M 3 y ,M 4 z ) m M 1 O 3 X (2/n) , wherein M 1 represents at least one element including at least Si and selected from the group consisting of Si, Ge, Ti, Zr, and Sn, M 2 represents at least one element including at least Ca and selected from the group consisting of Ca, Mg, Cd, Co, and Zn, M 3 represents at least one element including at least Sr and selected from the group consisting of Sr, Ra, Ba, and Pb, X represents at least one halogen element, M 4 represents at least one element including at least Eu 2+ and selected from the group consisting of rare-earth elements and Mn, m is in the range 1≦m≦4/3, n is in the range 5≦n≦7, and x, y, and z are each in such a range as to satisfy x+y+z=1, 0.45≦x≦0.8, 0.05≦y≦0.45, and 0.03≦z≦0.35.

2. A light-emitting device, comprising:
a semiconductor light-emitting element which emits light of a wavelength range where a peak wavelength is that of ultraviolet light or short-wavelength visible light;
a yellow phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light; and
a blue phosphor which is excited by the ultraviolet light or the short-wavelength visible light to emit visible light of a color different from that of the visible light emitted from the yellow phosphor,
the light-emitting device being configured to emit light with a color temperature of 3,200 K or less by using light from each phosphor.

3. The light-emitting device according to claim 2 , which is further configured to emit light so that an illuminance of 50 lx or more can be provided at a place 70 cm away from the device when a power of 1 W is supplied to the device.

4. The light-emitting device according to claim 2 , wherein the color temperature is from 2,800 K to 3,200 K.

Assignees

• Koito Mfg Co Ltd

Inventors

• Sasaki Yasutaka
• Daicho Hisayoshi
• Aoyagi Shinobu
• Sawa Hiroshi

Classifications

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• H10W72/5522

  comprising gold [Au] · CPC title

• H10W72/884

  Die-attach connectors and bond wires · CPC title

• H10W72/552

  comprising metals or metalloids, e.g. silver · 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