# US 10,371,325 B1 · Full spectrum white light emitting devices

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- Number: US 10,371,325 B1
- Document ID: US10371325B1
- Status: Granted
- Kind: B1
- Application number: 16/212,687
- Filed: 2018-12-07
- Granted: 2019-08-06
- Earliest claimed: 2018-06-25
- Assignees: Intematix Corporation
- Applicants: Intematix Corporation
- Inventors: Xianglong Yuan; Yi-Qun Li
- Web page: https://patentgrep.com/patent/US10371325B1

## CPC

- F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
- H10H 20/8513: {having two or more wavelength conversion materials}
- F21V 15/01: Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04})
- H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures
- H10H 20/813: having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies
- H10H 20/8515: {not being in contact with the bodies}
- H10H 20/853: characterised by their shape
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10W 90/00: Package configurations
- F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements
- F21Y 2113/13: comprising an assembly of point-like light sources
- F21Y 2115/10: Light-emitting diodes [LED]
- H10H 20/8512: {Wavelength conversion materials}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- 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
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A full spectrum light emitting device includes photoluminescence materials which generate light with a peak emission wavelength in a range 490 nm to 680 nm (green to red) and a broadband solid-state excitation source operable to generate broadband blue excitation light with a dominant wavelength in a range from 420 nm to 470 nm, where the broadband blue excitation light includes at least two different blue light emissions in a wavelength range 420 nm to 480 nm.

## Claims

### Claim 1

A full spectrum white light emitting device comprising:
a first photoluminescence material which generates light with a peak emission wavelength in a range 490 nm to 550 nm, and a second photoluminescence material which generates light with a peak emission wavelength in a range 600 nm to 680 nm; and
a broadband solid-state excitation source operable to generate excitation light with a dominant wavelength in a range from 420 nm to 480 nm and a FWHM greater than or equal to 30 nm.

### Claim 2 (depends on 1)

The full spectrum white light emitting device of claim 1, wherein the excitation light has a FWHM in a range selected from the group consisting of: from 30 nm to 50 nm, from 35 nm to 50 nm, from 40 nm to 50 nm, and 45 nm to 50 nm.

### Claim 3 (depends on 1)

The full spectrum white light emitting device of claim 1, characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 90.

### Claim 4 (depends on 3)

The full spectrum white light emitting device of claim 3, characterized by generating white light with a CRI Ra of greater than or equal to 95.

### Claim 5 (depends on 1)

The full spectrum white light emitting device of claim 1, characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 95.

### Claim 6 (depends on 1)

The full spectrum white light emitting device of claim 1, characterized by generating white light with a CRI R12 of greater than or equal to 90.

### Claim 7 (depends on 1)

The full spectrum white light emitting device of claim 1, wherein the light emitting device is operable to generate white light with a color temperature in a range from about 2500 K to about 6500K.

### Claim 8 (depends on 1)

The full spectrum white light emitting device of claim 1, characterized by generating white light with a IEC TM-30 fidelity index Rf of greater than or equal to 96.

### Claim 9 (depends on 1)

The full spectrum white light emitting device of claim 1, wherein the excitation light comprises at least two different wavelength blue light emissions.

### Claim 10 (depends on 9)

The full spectrum white light emitting device of claim 9, wherein the solid-state excitation source comprises:
a first LED operable to generate a blue light emission with a first dominant wavelength in a range 420 nm to 480 nm; and
a second LED operable to generate a different blue light emission with a second dominant wavelength in a range 420 nm to 480 nm.

### Claim 11 (depends on 9)

The full spectrum white light emitting device of claim 9, wherein the blue solid-state excitation source comprises an LED having an active region with at least two different quantum wells that each generate a respective one of the at least two different wavelength blue light emissions.

### Claim 12

A full spectrum white light emitting device comprising:
photoluminescence materials which generate light with a peak emission wavelength in a range 490 nm to 680 nm and
a broadband blue solid-state excitation source operable to generate broadband blue excitation light with a dominant wavelength in a range from 420 nm to 480 nm,
wherein the broadband blue excitation light comprises at least two different wavelength blue light emissions in a range 420 nm to 480 nm.

### Claim 13 (depends on 12)

The light emitting device of claim 12, wherein the broadband blue solid-state excitation source generates broadband blue excitation light with a FWHM selected from the group consisting of: at least 30 nm, from 30 nm to 50 nm, from 35 nm to 50 nm, from 40 nm to 50 nm, and 45 nm to 50 nm.

### Claim 14 (depends on 12)

The light emitting device of claim 12, wherein the broadband blue solid-state excitation source comprises:
a first LED for generating a blue light emission with a first dominant wavelength in a range 420 nm to 480 nm and
a second LED for generating a different wavelength blue light emission with a second dominant wavelength in a range 420 nm to 480 nm.

### Claim 15 (depends on 14)

The light emitting device of claim 14, wherein the first dominant wavelength is in a range from 420 nm to 450 nm; and the second dominant wavelength is in a range from 450 nm to 480 nm.

### Claim 16 (depends on 14)

The light emitting device of claim 14, further comprising a third LED for generating a blue light emission with a third dominant wavelength in a range 420 nm to 480 nm which is different from the first and second dominant wavelengths.

### Claim 17 (depends on 16)

The light emitting device of claim 16, wherein the first LED has a dominant wavelength of about 441 nm; the second LED has a dominant wavelength of about 451 nm; and the third LED with a dominant wavelength of about 468 nm.

### Claim 18 (depends on 12)

The light emitting device of claim 12, characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 90.

### Claim 19 (depends on 12)

The light emitting device of claim 12, characterized by generating white light with a CRI R1 to CRI R15 of greater than or equal to 95.

### Claim 20 (depends on 18, 19)

The light emitting device of claim 18 or claim 19, characterized by generating white light with a CRI Ra of greater than or equal to 95.

### Claim 21 (depends on 12)

The light emitting device of claim 12, characterized by generating white light with a CRI Ra of greater than or equal to 80.

### Claim 22 (depends on 12)

The light emitting device of claim 12, characterized by generating white light with a CRI R12 of greater than or equal to 90.

### Claim 23 (depends on 12)

The light emitting device of claim 12, wherein the light emitting device is operable to generate white light with a color temperature in a range selected from the group consisting of: from about 2500 K to about 6500K; from about 2500 K to about 3000K; and from about 4000 K to about 6500K.

### Claim 24 (depends on 12)

The light emitting device of claim 12, characterized by generating white light with a IEC TM-30 fidelity index Rf of greater than or equal to 96.

### Claim 25 (depends on 12)

The light emitting device of claim 12, wherein there is a difference in wavelength between the at least two blue light emissions of at least 5 nm, or a difference in wavelength between the at least two blue light emissions of at least 10 nm.

### Claim 26 (depends on 12)

The light emitting device of claim 12, wherein the broadband blue solid-state excitation source comprises an LED having an active region with at least two different quantum wells that each generate a respective one of the at least two different wavelength blue light emissions.

### Claim 27 (depends on 12)

The light emitting device of claim 12, wherein the green to yellow photoluminescence material and red photoluminescence material are located remotely to the broadband blue solid-state excitation source.

### Claim 28

A white light emitting device comprising: a first photoluminescence material which generates light with a peak emission wavelength in a range 490 nm to 550 nm, and a second photoluminescence material which generates light with a peak emission wavelength in a range 600 nm to 680 nm; and a broadband solid-state excitation source operable to generate excitation light with a dominant wavelength in a range from 420 nm to 480 nm and a FWHM greater than or equal to 30 nm, characterized by generating white light with a CRI Ra of greater than or equal to 80.