# US 9,518,719 B2 · Light emitting device

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- Number: US 9,518,719 B2
- Document ID: US9518719B2
- Status: Granted
- Kind: B2
- Application number: 14/621,023
- Filed: 2015-02-12
- Published: 2016-05-05
- Granted: 2016-12-13
- Earliest claimed: 2014-10-29
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Euna Moon; Hongkyu Lee; Yeonhong Jung
- Web page: https://patentgrep.com/patent/US9518719B2

## CPC

- C09K 11/7774: {Aluminates}
- C09K 11/77347: {Silicon Nitrides or Silicon Oxynitrides}
- C09K 11/77348: {Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides}
- F21V 9/32: characterised by the arrangement of the photoluminescent material
- F21V 9/38: Combination of two or more photoluminescent elements of different materials
- H10W 90/00: Package configurations
- F21Y 2113/13: comprising an assembly of point-like light sources
- F21Y 2115/10: Light-emitting diodes [LED]
- H10H 20/8513: {having two or more wavelength conversion materials}
- H10W 72/01515: {Forming coatings}
- H10W 72/075: {of bond wires}
- H10W 90/756: {between a chip and a stacked lead frame, conducting package substrate or heat sink}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## 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).

## Claims

### Claim 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).

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 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.

### Claim 6 (depends on 5)

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.

### Claim 7 (depends on 5)

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.

### Claim 8 (depends on 5)

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.

### Claim 9 (depends on 5)

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

### Claim 10 (depends on 5)

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.

### Claim 11 (depends on 10)

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.

### Claim 12 (depends on 5)

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.

### Claim 13 (depends on 12)

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.

### Claim 14 (depends on 5)

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.

### Claim 15 (depends on 14)

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.

### Claim 16 (depends on 5)

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.

### Claim 17 (depends on 5)

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.

### Claim 18 (depends on 17)

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.

### Claim 19 (depends on 5)

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.

### Claim 20 (depends on 19)

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.