Single-crystal phosphor and light-emitting device

Patent metadata

Field	Value
Publication number	US-2016240748-A1
Application number	US-201415030689-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Oct 23, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

As one of purposes, the present invention provides: a single-crystal phosphor which can exhibit excellent properties under high-temperature conditions; and a light-emitting device in which the phosphor is used. As one embodiment, a single-crystal phosphor is provided, which has a chemical composition represented by the compositional formula: (Y 1-x-y-z Lu x Gd y Ce z ) 3+a Al 5-a O 12 (0≦x≦0.9994, 0≦y≦0.0669, 0.0002≦z≦0.0067, −0.016≦a≦0.315).

First claim

1 . A single crystal phosphor, comprising a composition represented by a composition formula (Y 1-x-y-z Lu x Gd y Ce z ) 3+a Al 5-a O 12 (0≦x≦0.9994, 0≦y≦0.0669, 0.0002≦z≦0.0067, −0.016≦a≦0.315).

2 . The single crystal phosphor according to claim 1 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not shorter than 514 nm and not longer than 544 nm, and
wherein an internal quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.90.

3 . The single crystal phosphor according to claim 1 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is longer than 544 nm and not longer than 546 nm, and
wherein an internal quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.80.

4 . The single crystal phosphor according to claim 1 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not shorter than 514 nm and not longer than 544 nm, and
wherein a value of a ratio of an internal quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an internal quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.90.

5 . The single crystal phosphor according to claim 1 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is longer than 544 nm and not longer than 546 nm, and
wherein a value of a ratio of an internal quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an internal quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.80.

6 . The single crystal phosphor according to claim 1 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not shorter than 514 nm and not longer than 544 nm, and
wherein a value of a ratio of an external quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an external quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.85.

7 . The single crystal phosphor according to claim 1 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is longer than 544 nm and not longer than 546 nm, and
wherein a value of a ratio of an external quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an external quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.80.

8 . A light emitting device, comprising:
a light emitting element to emit bluish light; and a single crystal phosphor to absorb the light emitted by the light emitting element and emit yellowish fluorescence, wherein the single crystalline phosphor comprises the single crystal phosphor according to claim 1 .

9 . A light emitting device, comprising:
a light emitting element to emit bluish light; and a single crystal phosphor to absorb the light emitted by the light emitting element and emit yellowish fluorescence, wherein the single crystalline phosphor comprises the single crystal phosphor according to claim 4 .

10 . A light emitting device, comprising:
a light emitting element to emit bluish light; and a single crystal phosphor to absorb the light emitted by the light emitting element and emit yellowish fluorescence, wherein the single crystalline phosphor comprises the single crystal phosphor according to claim 5 .

11 . A light emitting device, comprising:
a light emitting element to emit bluish light; and a single crystal phosphor to absorb the light emitted by the light emitting element and emit yellowish fluorescence, wherein the single crystalline phosphor comprises the single crystal phosphor according to claim 6 .

12 . A light emitting device, comprising:
a light emitting element to emit bluish light; and a single crystal phosphor to absorb the light emitted by the light emitting element and emit yellowish fluorescence, wherein the single crystalline phosphor comprises the single crystal phosphor according to claim 7 .

13 . The single crystal phosphor according to claim 2 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not shorter than 514 nm and not longer than 544 nm, and
wherein a value of a ratio of an internal quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an internal quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.90.

14 . The single crystal phosphor according to claim 3 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is longer than 544 nm and not longer than 546 nm, and
wherein a value of a ratio of an internal quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an internal quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.80.

15 . The single crystal phosphor according to claim 2 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not shorter than 514 nm and not longer than 544 nm, and
wherein a value of a ratio of an external quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an external quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.85.

16 . The single crystal phosphor according to claim 3 , wherein a fluorescence peak wavelength at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is longer than 544 nm and not longer than 546 nm, and
wherein a value of a ratio of an external quantum efficiency at a temperature of 300 degrees C. and an exciting light peak wavelength of 450 nm, to an external quantum efficiency at a temperature of 25 degrees C. and an exciting light peak wavelength of 450 nm is not lower than 0.80.

17 . A light emitting device, comprising:
a light emitting element to emit bluish light; and a single crystal phosphor to absorb the light emitted by the light emitting element and emit yellowish fluorescence, wherein the single crystalline phosphor comprises the single crystal phosphor according to claim 2 .

18 . A light emitting device, comprising:
a light emitting element to emit bluish light; and a single crystal phosphor to absorb the light emitted by the light emitting element and emit yellowish fluorescence, wherein the single crystalline phosphor comprises the single crystal phosphor according to claim 3 .

Assignees

• Koha Co Ltd
• Nat Inst For Materials Science

Inventors

• Inomata Daisuke
• Aoki Kazuo
• Shimamura Kiyoshi
• Garcia Villora Encarnacion Antonia

Classifications

• H10W90/724

  between a chip and a stacked insulating package substrate, interposer or RDL · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• C09K11/7774

  Aluminates · CPC title

• H10H20/8512 Primary

  Wavelength conversion materials · CPC title

• H01L33/502 Primary

  Electricity · mapped topic