Phosphor, method of producing same, and light-emitting device

Patent metadata

Field	Value
Publication number	US-10385264-B2
Application number	US-201715615858-A
Country	US
Kind code	B2
Filing date	Jun 7, 2017
Priority date	Jun 24, 2016
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A phosphor includes, as a main component, a compound represented by a general formula (3-a)YO3/2.aCeO3/2.(5-b)AlO3/2.bGaO3/2.cKO1/2.dPO5/2, where a, b, c and d satisfy 0.12≤a≤0.18, 1.50≤b≤3.00, 0.01≤c≤0.08, and 0.01≤d≤0.08.

First claim

What is claimed is:

1. A phosphor including, as a main component, a compound represented by a general formula (3-a)YO 3/2 .aCeO 3/2 .(5-b)AlO 3/2 .bGaO 3/2 .cKO 1/2 .dPO 5/2 , where a, b, c and d satisfy 0.12≤a≤0.18, 1.50≤b≤3.00, 0.01≤c≤0.08, and 0.01≤d≤0.08.

2. The phosphor according to claim 1 , including the compound in an amount of 70% by weight or more relative to the entire phosphor.

3. The phosphor according to claim 1 , including the compound in an amount of 90% by weight or more relative to the entire phosphor.

4. The phosphor according to claim 1 , wherein the phosphor absorbs light having a peak wavelength in a range of 380 to 420 nm to emit light having a peak wavelength in a range of 530 to 550 nm.

5. A light-emitting device comprising:
a phosphor including, as a main component, a compound represented by a general formula (3-a)YO 3/2 .aCeO 3/2 .(5-b)AlO 3/2 .bGaO 3/2 .cKO 1/2 .dPO 5/2 , where a, b, c and d satisfy 0.12≤a≤0.18, 1.50 b≤3.00, 0.01≤c≤0.08, and 0.01≤d≤0.08; and
an excitation light source which emits first light having a peak wavelength in a range of 380 to 420 nm,
wherein the phosphor absorbs part of the first light from the excitation light source to emit second light having a longer wavelength than the first light.

6. The light-emitting device according to claim 5 , wherein the phosphor includes the compound in an amount of 70% by weight or more relative to the entire phosphor.

7. The light-emitting device according to claim 5 , wherein the phosphor includes the compound in an amount of 90% by weight or more relative to the entire phosphor.

8. The light-emitting device according to claim 5 , wherein the second light is light having a peak wavelength in a range of 530 to 550 nm.

9. A method for producing a phosphor, the phosphor including, as a main component, a compound represented by a general formula (3-a)YO 3/2 .aCeO 3/2 .(5-b)AlO 3/2 .bGaO 3/2 .cKO 1/2 .dPO 5/2 , where a, b, c and d satisfy 0.12≤a≤0.18, 1.50≤b≤3.00, 0.01≤c≤0.08, and 0.01≤d≤0.08, the method comprising:
preparing a mixture which includes starting materials for the phosphor; and
firing the mixture in an atmosphere with an oxygen partial pressure in a range of 10 −6 to 10 −3 atm.

10. The method according to claim 9 , wherein the mixture includes, as a reaction accelerator, a fluorine-containing compound.

11. The method according to claim 9 , wherein the phosphor includes the compound in an amount of 70% by weight or more relative to the entire phosphor.

12. The method according to claim 9 , wherein the phosphor includes the compound in an amount of 90% by weight or more relative to the entire phosphor.

13. The method according to claim 9 , wherein the phosphor absorbs light having a peak wavelength in a range of 380 to 420 nm to emit light having a peak wavelength in a range of 530 to 550 nm.

Assignees

• Panasonic Corp

Inventors

• Okuyama Kojiro
• Nagasaki Yoshihisa
• Ohbayashi Takashi

Classifications

• 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

• C09K11/7777

  Phosphates · CPC title

• C09K11/701

  Chalcogenides · CPC title

• C09K11/641

  Chalcogenides · CPC title

• C09K11/0822

  with rare earth metals · CPC title