Phosphor

Patent metadata

Field	Value
Publication number	US-9926488-B2
Application number	US-201514826661-A
Country	US
Kind code	B2
Filing date	Aug 14, 2015
Priority date	Aug 14, 2015
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A phosphor, having a general formula of K 2 [Si 1-x Ge x ] y F 6 :Mn 1-y 4+ . The phosphor is excited to emit a light having a first main emission peak with a first maximum emission intensity and a first dominant wavelength, wherein a relative emission intensity S of the light of the phosphor is constantly greater than 85% across an temperature of the phosphor between 300 K and 470 K during operation, wherein S=(I T /I RT )*100%, I RT and I T are the first maximum emission intensity when the temperature of the phosphor is at 300 K and T during operation respectively, and 300 K<T≤470K.

First claim

What is claimed is:

1. A phosphor, having a general formula of K 2 [Si 1-x Ge x ] y F 6 :Mn 1-y 4+ , wherein 0.4≤x≤0.8 and 0.8≤y<1, being excited to emit a light having a first main emission peak with a first maximum emission intensity and a first dominant wavelength, comprising multiple discrete particles having a shape of irregular polyhedron, wherein a relative emission intensity S of the light of the phosphor is constantly greater than 85% across an temperature of the phosphor between 300 K and 470 K during operation, wherein S=(I T /I RT )*100%, I RT and I T are the first maximum emission intensity when the temperature of the phosphor is at 300 K and T during operation respectively, and 300 K<T≤470K.

2. The phosphor according to claim 1 , wherein the first dominant wavelength is between 600 nm and 650 nm.

3. The phosphor according to claim 2 , wherein the phosphor being excited to emit the light comprising a second main emission peak with a second maximum emission intensity and a second dominant wavelength between 634.2 nm and 635.8 nm and higher than the first dominant wavelength.

4. The phosphor according to claim 3 , wherein a ratio of the first maximum emission intensity to the second maximum emission intensity is between 1.1 and 1.7.

5. The phosphor according to claim 3 , wherein the second main emission peak has a full width at half maximum (FWHM) of not more than 7 nm.

6. The phosphor as claimed in claim 1 , wherein when 320 K≤T≤420 K, the relative emission intensity is between 97% and 105%.

7. The phosphor according to claim 1 , wherein when 350 K≤T≤430 K, the relative emission intensity is between 95% and 115%.

8. The phosphor as claimed in claim 1 , wherein the first main emission peak has a full width at half maximum of not more than 6 nm.

9. The phosphor as claimed in claim 1 , wherein the multiple discrete particles having an average particle diameter between 10 μm and 60 μm.

10. The phosphor as claimed in claim 1 , wherein one of the particles with a diameter not less than 10 μm has a number of faces, and the number of faces is not less than 3.

11. The phosphor as claimed in claim 10 , wherein the number is not less than 4.

12. A light-emitting device, comprising the phosphor as claimed in claim 1 , wherein the light-emitting device emits a white radiation.

13. The light-emitting device as claimed in claim 12 , wherein the white radiation has a correlated color temperature between 3000 K and 5000 K both inclusive.

Assignees

• Epistar Corp

Inventors

• Lin Chun Che
• Wei ling-ling
• Liu Ru-Shi
• Hsu Ming-Chi
• Liu Ai-Sen

Classifications

• C09K11/666 Primary

  Aluminates; Silicates · CPC title

• C09K11/665

  with alkali or alkaline earth metals · CPC title

• H05B33/12

  Light sources with substantially two-dimensional [2D] radiating surfaces · CPC title

• C09K11/617

  Silicates · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title