# US 2018/0320833 A1 · Led lamps with improved quality of light

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- Number: US 2018/0320833 A1
- Document ID: US20180320833A1
- Status: Published application
- Kind: A1
- Application number: 16/031,144
- Filed: 2018-07-10
- Published: 2018-11-08
- Earliest claimed: 2009-09-18
- Assignees: Soraa, Inc.
- Applicants: Soraa, Inc.
- Inventors: Aurelien J.F. DAVID; Troy A. TROTTIER; Michael R. KRAMES
- Web page: https://patentgrep.com/patent/US20180320833A1

## CPC

- F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
- F21K 9/23: Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
- F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
- F21K 9/233: specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
- F21K 9/62: using mixing chambers, e.g. housings with reflective walls
- F21V 3/00: Globes; Bowls; Cover glasses (with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506)
- F21V 7/04: Optical design
- F21V 9/38: Combination of two or more photoluminescent elements of different materials
- F21V 13/08: the elements being filters or photoluminescent elements and reflectors
- F21V 13/14: the elements being filters or photoluminescent elements, reflectors and refractors
- F21V 23/02: the elements being transformers, impedances {or power supply units, e.g. a transformer with a rectifier}
- F21V 23/04: the elements being switches (safety devices F21V25/00)
- F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks
- H10H 20/825: containing nitrogen, e.g. GaN
- H10H 20/8506: {Containers}
- H10H 20/8512: {Wavelength conversion materials}
- H10H 20/8513: {having two or more wavelength conversion materials}
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- H10H 20/856: Reflecting means
- H10H 29/14: comprising multiple light-emitting semiconductor components
- H10W 90/00: Package configurations
- F21Y 2113/13: comprising an assembly of point-like light sources
- F21Y 2115/10: Light-emitting diodes [LED]
- H10H 20/819: characterised by their shape, e.g. curved or truncated substrates
- 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
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- 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

## Abstract

LED lamp systems having improved light quality are disclosed. The lamps emit more than 500 lm and more than 2% of the power in the spectral power distribution is emitted within a wavelength range from about 390 nm to about 430 nm.

## Claims

### Claim 1

An illumination system comprising:
at least one LED device configured in a housing structure, wherein said at least one LED device comprises an n-type region, a light-emitting active region, and a p-type region, said at least one LED device configured to emit LED light having a peak emission wavelength of about 405 nm, said at least one LED device having an external quantum efficiency greater than 45% measured at an ambient temperature of 25° C. and at a current density of 40 A/cm2;
a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light;
a power source electrically coupled to said at least one LED device; and
wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a correlated color temperature (CCT) and an International Commission on Illumination (CIE) whiteness, said CIE whiteness being at least equal to a reference CIE whiteness of a blackbody radiator with the same CCT, and wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is at least 4% of said first power.

### Claim 2 (depends on 1)

The illumination system of claim 1, wherein said second power is less than 25% of said first power.

### Claim 3 (depends on 1)

The illumination system of claim 1, wherein said emitted light has a chromaticity on or below the Planckian Locus.

### Claim 4 (depends on 1)

The illumination system of claim 1, wherein said CCT is between 3300K and 5300K.

### Claim 5 (depends on 1)

The illumination system of claim 1, wherein SPD has a cyanosis observation index (COI) below 3.3.

### Claim 6 (depends on 1)

The lighting system of claim 1, wherein said emitted light has a color rendering index (CRI) greater than 90.

### Claim 7 (depends on 5)

A lighting fixture comprising the lighting system of claim 5.

### Claim 8 (depends on 7)

A method of using the lighting fixture of claim 7 in a medical setting.

### Claim 9

An illumination system comprising:
at least one LED device configured to emit LED light having a peak emission wavelength of about 405 nm, said at least one LED device having an external quantum efficiency greater than 45% measured at an ambient temperature of 25° C. and at a current density of 40 A/cm2;
a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light; and
wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a CCT and a CIE whiteness, and wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is a sufficient portion of said first power such that said CIE whiteness is at least equal to a reference CIE whiteness of a blackbody radiator having the same CCT.

### Claim 10 (depends on 9)

The illumination system of claim 9, wherein said second power is at least at least 4% of said first power.

### Claim 11 (depends on 9)

The illumination system of claim 9, wherein said emitted light has a chromaticity on or below the Planckian Locus.

### Claim 12 (depends on 9)

The illumination system of claim 9, wherein said CCT is between 3300K and 5300K.

### Claim 13 (depends on 9)

The lighting system of claim 9, wherein said emitted light has a color rendering index (CRI) greater than 90.

### Claim 14

An illumination system comprising:
at least one LED device configured to emit LED light having a peak emission wavelength of about 405 nm;
a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light; and
wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a peak between 390 nm and 430 nm and a valley between 470 nm and 490 nm, wherein said valley has a low point of essentially zero, wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is at least 4% of said first power.

### Claim 15 (depends on 14)

The illumination system of claim 14, wherein said valley has a width of at least 20 nm.

### Claim 16 (depends on 15)

The illumination system of claim 15, wherein said valley has a band between 480 and 490 with an intensity of about 0.

### Claim 17 (depends on 14)

The illumination system of claim 14, wherein said emitted light has a chromaticity on or below the Planckian Locus.

### Claim 18 (depends on 14)

The illumination system of claim 14, wherein said emitted light has an R9 above 50.

### Claim 19 (depends on 14)

A lighting fixture comprising the lighting system of claim 14.

### Claim 20 (depends on 19)

A method of using the lighting fixture of claim 19 in a medical setting.