Phosphor and light-emitting equipment using phosphor

Patent metadata

Field	Value
Publication number	US-11084980-B2
Application number	US-201816055343-A
Country	US
Kind code	B2
Filing date	Aug 6, 2018
Priority date	Nov 26, 2003
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.

First claim

What is claimed is:

1. Light-emitting equipment, comprising at least one light source, the light source comprising at least one light-emitting source and a phosphor, wherein:
the light-emitting source emits a light having a wavelength of 330 to 500 nm; and
the phosphor comprises at least one of a nitride phosphor comprising at least one of CaAlSiN 3 activated with Eu and (Ca,Sr)AlSiN 3 activated with Eu.

2. The light-emitting equipment according to claim 1 , wherein the light-emitting source emits a light having a wavelength of 420 to 500 nm.

3. The light-emitting equipment according to claim 2 , wherein the phosphor further comprises at least one of:
a phosphor having an emission peak at a wavelength of 500 to 570 nm; and
a phosphor having an emission peak at wavelength of 550 to 600 nm.

4. The light-emitting equipment according to claim 1 , wherein the light-emitting source emits a light having a wavelength of 330 to 420 nm.

5. The light-emitting equipment according to claim 4 , wherein the phosphor further comprises:
a phosphor having an emission peak at a wavelength of 420 to 500 nm and a phosphor having an emission peak at a wavelength of 500 to 570 nm.

6. The light-emitting equipment according to claim 1 , wherein the light-emitting equipment is lighting equipment.

7. The light-emitting equipment according to claim 1 , wherein the light-emitting equipment is an image display unit.

8. The light-emitting equipment according to claim 1 , wherein the nitride phosphor comprises a crystal phase having a crystal structure belonging to the Cmc2 1 space group.

9. The light-emitting equipment according to claim 1 , wherein the nitride phosphor comprises Ca and Sr in amounts satisfying:
0.02≤(number of atoms of Ca )/{(number of atoms of Ca )+(number of atoms of Sr )}<1.

10. The tight-emitting equipment according to claim 1 , wherein, when irradiated by an excitation source, the nitride phosphor emits light having a peak emission intensity at a wavelength of from 570 nm to 700 am.

11. The light-emitting equipment according to claim 1 , wherein, when irradiated by an excitation source, the nitride phosphor emits light having a color satisfying:
0.45≤ x ≤0.7

as a value of (x, y) the CIE chromaticity coordinates.

12. The light-emitting equipment according to claim 1 , wherein the nitride phosphor comprises impurity elements of Fe, Co, and Ni in an amount of 500 ppm or less.

13. The light-emitting equipment according to claim 1 , wherein:
the nitride phosphor comprises an inorganic compound and a further crystal phase or amorphous phase; and
the inorganic compound is present in an amount of at least 20% by weight based on a total weight of the inorganic compound and the further crystal phase or amorphous phase.

14. Light-emitting equipment, comprising at least one light source, the light source comprising at least one light-emitting source and a phosphor, wherein:
the light-emitting source emits a light having a wavelength of 420 to 500 nm;
the phosphor comprises a phosphor having an emission peak at a wavelength of 500 to 570 nm or a phosphor having an emission peak at a wavelength of 550 to 600 nm; and
the phosphor comprises CaAlSiN 3 activated with Eu or (Ca,Sr)AlSiN 3 activated with Eu.

Assignees

• Mitsubishi Chem Corp
• Nat Inst Materials Science
• Nichia Corp
• Citizen Electronics

Inventors

• Hirosaki Naoto
• Ueda Kyota
• Yamamoto Hajime

Classifications

• H10W90/756

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• H10W72/884

  Die-attach connectors and bond wires · CPC title

• C09K11/77928 Primary

  Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides · CPC title

• C09K11/7783

  containing two or more rare earth metals one of which being europium · CPC title