Light emitting device

Patent metadata

Field	Value
Publication number	US-9518719-B2
Application number	US-201514621023-A
Country	US
Kind code	B2
Filing date	Feb 12, 2015
Priority date	Oct 29, 2014
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A light emitting device is provided. The light emitting device includes a first white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.4822, 0.3980); a second white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.4180, 0.4337); and a third white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.2806, 0.2981).

First claim

What is claimed is:

1. A light emitting device comprising:
a first white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.4822, 0.3980);
a second white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.4180, 0.4337); and
a third white light source emitting a white light of which color coordinates exist within a MacAdam 10-step ellipse from color coordinates (0.2806, 0.2981).

2. The light emitting device according to claim 1 , wherein the first white light source comprises a blue light emitting diode (LED) and phosphors, wherein the phosphors comprise a third phosphor emitting light having a main wavelength of about 555 nm to about 575 nm, and a fourth phosphor emitting light having a main wavelength of about 580 nm to about 610 nm.

3. The light emitting device according to claim 1 , wherein the second white light source comprises a blue light emitting diode (LED) and phosphors, wherein the phosphors comprise a third phosphor emitting light having a main wavelength of about 555 nm to about 575 nm, and a fourth phosphor emitting light having a main wavelength of about 580 nm to about 610 nm.

4. The light emitting device according to claim 1 , wherein the third white light source comprises a blue light emitting diode (LED) and phosphors, wherein the phosphors comprise a first phosphor or a second phosphor, the first phosphor emitting light having a main wavelength of about 495 nm to about 510 nm and the second phosphor emitting light having a main wavelength of about 550 nm to about 555 nm, a third phosphor emitting light having a main wavelength of about 555 nm to about 575 nm, and a fourth phosphor emitting light having a main wavelength of about 580 nm to about 610 nm.

5. A light emitting device comprising:
a first white light source comprising a blue LED and phosphors, wherein the phosphors comprise a third phosphor emitting light having a main wavelength of about 555 nm to about 575 nm, and a fourth phosphor emitting light having a main wavelength of about 580 nm to about 610 nm;
a second white light source comprising the blue LED and phosphors, wherein the phosphors comprise a third phosphor emitting light having a main wavelength of about 555 nm to about 575 nm, and a fourth phosphor emitting light having a main wavelength of about 580 nm to about 610 nm; and
a third white light source comprising the blue light emitting diode (LED) and phosphors, wherein the phosphors comprise a first phosphor or a second phosphor, the first phosphor emitting light having a main wavelength of about 495 nm to about 510 nm and the second phosphor emitting light having a main wavelength of about 550 nm to about 555 nm, a third phosphor emitting light having a main wavelength of about 555 nm to about 575 nm, and a fourth phosphor emitting light having a main wavelength of about 580 nm to about 610 nm.

6. The light emitting device according to claim 5 , wherein the first phosphor comprises BaSi2O2N2:Eu or (Bax,Sr1-x)Si2O2N2:Eu where 0<x<1.

7. The light emitting device according to claim 5 , wherein the second phosphor comprises (Bax,Sr1-x)2SiO4:Eu or Lu3(Alx,Ga1-x)5O12:Ce where 0<x<1.

8. The light emitting device according to claim 5 , wherein the third phosphor comprises Lu3Al5O12:Ce or (Lux,Gd1-x)3Al5O12:Ce where 0<x<1.

9. The light emitting device according to claim 5 , wherein the fourth phosphor comprises (Cax,Sr1-x)AlSiN3:Eu where 0<x<1.

10. The light emitting device according to claim 5 , wherein in the first white light source, the third phosphor occupies about 85 wt % to about 97 wt % of all the phosphors and the fourth phosphor occupies about 3 wt % to about 15 wt % of all the phosphors.

11. The light emitting device according to claim 10 , wherein in the first white light source, the third phosphor occupies about 90 wt % of all the phosphors and the fourth phosphor occupies about 10 wt % of all the phosphors.

12. The light emitting device according to claim 5 , wherein in the second white light source, the third phosphor occupies about 85 wt % to about 97 wt % of all the phosphors and the fourth phosphor occupies about 3 wt % to about 15 wt % of all the phosphors.

13. The light emitting device according to claim 12 , wherein in the second white light source, the third phosphor occupies about 94 wt % of all the phosphors and the fourth phosphor occupies about 6 wt % of all the phosphors.

14. The light emitting device according to claim 5 , wherein in the third white light source, the first or second phosphor occupies about 15 wt % to about 30 wt % of all the phosphors, the third phosphor occupies about 60 wt % to about 85 wt % of all the phosphors and the fourth phosphor occupies about 10 or less wt % of all the phosphors.

15. The light emitting device according to claim 14 , wherein in the third white light source, the first phosphor occupies about 25 wt % of all the phosphors, the third phosphor occupies about 72 wt % of all the phosphors and the fourth phosphor occupies about 3 wt % of all the phosphors.

16. The light emitting device according to claim 5 , wherein the first white light source occupies about 5% to about 55% of whole power consumption of the light emitting device, the second white light source occupies about 20% to about 60% of whole power consumption of the light emitting device, and the third white light source occupies about 5% to about 55% of whole power consumption of the light emitting device.

17. The light emitting device according to claim 5 ,
wherein in the first white light source, the third phosphor occupies about 85 wt % to about 97 wt % of all the phosphors and the fourth phosphor occupies about 3 wt % to about 15 wt % of all the phosphors, and
wherein in the second white light source, the third phosphor occupies about 85 wt % to about 97 wt % of all the phosphors and the fourth phosphor occupies about 3 wt % to about 15 wt % of all the phosphors.

18. The light emitting device according to claim 17 ,
wherein in the third white light source, the first or second phosphor occupies about 15 wt % to about 30 wt % of all the phosphors, the third phosphor occupies about 60 wt % to about 85 wt % of all the phosphors and the fourth phosphor occupies about 10 or less wt % of all the phosphors.

19. The light emitting device according to claim 5 ,
wherein the first phosphor comprises BaSi2O2N2:Eu or (Bax,Sr1-x)Si2O2N2:Eu where 0<x<1,
wherein the second phosphor comprises (Bax,Sr1-x)2SiO4:Eu or Lu3(Alx,Ga1-x)5O12:Ce where 0<x<1,
wherein the third phosphor comprises Lu3Al5O12:Ce or (Lux,Gd1-x)3Al5O12:Ce where 0<x<1, and
wherein the fourth phosphor comprises (Cax,Sr1-x)AlSiN3:Eu where 0<x<1.

20. The light emitting device according to claim 19 ,
wherein in the first white light source, the third phosphor occupies about 85 wt % to about 97 wt % of all the phosphors and the fourth phosphor occupies about 3 wt % to about 15 wt % of all the phosphors,
wherein in the second white light source, the third phosphor occupies about 85 wt % to about 97 wt % of all the phosphors and the fourth phosphor occupies about 3 wt % to about 15 wt % of all the phosphors, and
wherein in the third white light source, the first or second phosphor occupies about 15 wt % to about 30 wt % of all the phosphors, the third phosphor occupies about 60 wt % to about 85 wt % of all the phosphors and the fourth phosphor occupies about 10 or less wt % of all the phosphors.

Assignees

• Lg Electronics Inc

Inventors

• Moon Euna
• Lee Hongkyu
• Jung Yeonhong

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V9/32

  characterised by the arrangement of the photoluminescent material · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• H10W90/756

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

• H10W72/01515

  Forming coatings · CPC title