# US 12,760,865 B2 · Lighting system with enhanced color gamut

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- Number: US 12,760,865 B2
- Document ID: US12760865B2
- Status: Granted
- Kind: B2
- Application number: 19/140,060
- Filed: 2023-12-20
- Published: 2026-07-23
- Granted: 2026-10-13
- Earliest claimed: 2022-12-27
- Assignees: Signify Holding B.V.
- Applicants: Signify Holding B.V.
- Inventors: Cornelis Teunissen; Marcel Petrus Lucassen; Martinus Petrus Joseph Peeters; René Theodorus Wegh
- Web page: https://patentgrep.com/patent/US12760865B2

## CPC

- F21V 9/38: Combination of two or more photoluminescent elements of different materials
- F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
- F21V 9/40: with provision for controlling spectral properties, e.g. colour, or intensity
- F21W 2131/1005: {of working places, building sites or the like}
- F21W 2131/103: of streets or roads
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- 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
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS

## Abstract

The invention provides a light generating system (1000) comprising (i) one or more light generating devices (100) and (ii) two or more luminescent materials (200), wherein: (A) the one or more light generating devices (100) are configured to generate device light (101); wherein the one or more light generating devices (100) comprise a first light generating device (110); (B) the first light generating device (110) is configured to generate first device light (111) having a peak wavelength selected from the range of 440-460 nm; (C) the two or more luminescent materials are configured to generate luminescent material light (201); wherein the two or more luminescent materials (200) comprises a first luminescent material (210) and a second luminescent material (220); (D) the first luminescent material (210) is configured to convert at least part of the first device light (111) into first luminescent material light (211) having a peak wavelength selected from the range of 495-580 nm, and a full width half maximum selected from the range of 25-120 nm; (E) the second luminescent material (220) is configured to convert at least part of the first device light (111) and/or part of the first luminescent material light (211) into second luminescent material light (221) having a peak wavelength selected from the range of 600-680 nm, wherein the second luminescent material (220) at least comprises a luminescent material configured to provide luminescent material light in said wavelength range having a full width half maximum selected from the range of 50-140 nm; (F) the light generating system (1000) is configured to generate white system light (1001) comprising at least part of the device light (101) and at least part of the luminescent material light (201).

## Claims

### Claim 1

A light generating system comprising (i) one or more light generating devices and (ii) two or more luminescent materials, wherein:
the one or more light generating devices are configured to generate device light; wherein the one or more light generating devices comprise a first light generating device; wherein the first light generating device comprises a solid state light source;
the first light generating device is configured to generate first device light having a peak wavelength selected from the range of 440-460 nm;
the two or more luminescent materials are configured to generate luminescent material light; wherein the two or more luminescent materials comprises a first luminescent material and a second luminescent material;
the first luminescent material is configured to convert at least part of the first device light into first luminescent material light having a peak wavelength selected from the range of 495-580 nm, and a full width half maximum selected from the range of 25-120 nm;
the second luminescent material is configured to convert at least part of the first device light and/or part of the first luminescent material light into second luminescent material light having a peak wavelength selected from the range of 600-680 nm, wherein the second luminescent material at least comprises (i) a luminescent material configured to provide luminescent material light in said wavelength range having a full width half maximum selected from the range of 50-140 nm, and (ii) a luminescent material configured to generate luminescent material light having a peak wavelength selected from the range of 600-680 nm and having one or more emission lines having a full width half maximum selected from the range of up to 40 nm;
the light generating system is configured to generate white system light comprising at least part of the device light and at least part of the luminescent material light, wherein the white system light has a correlated color temperature; and
the light generating system is configured such that the system light complies with the following conditions:
a luminous efficacy of radiation (LER) above the equation LERmin=0.90*(−5.946E-13*x4+1.247E-08*x3−9.622E-05*x2+3.115E-01*x+6.0);
an area F1 in the CIE 1976 u′v′ chromaticity space enclosed by the 85 test-color samples of the Farnsworth-Munsell 100 (FM100) Hue Test has a value smaller than given by the equation F1max=(−5.519E-15*x3−4.380E-11*x2+1.724E-06*x+1.17E-03)±10% and a larger value than given by the equation F1min=(F1max−1.67E-03)±10%;
a first radiant flux E1 within the wavelength range of 380-490 nm, relative to a total radiant flux Et in the wavelength range of 380-780 nm is below the equation E1max/Et=(3.207E-11*x3−1.097E-06*x2+1.297E-02*x−10.3)±10% and above the equation E1min/Et=(E1max/Et−6.5)±10%;
a second radiant flux E2 within the wavelength range of 491-600 nm, relative to a total radiant flux Et in the wavelength range of 380-780 nm is below the equation E2max/Et=(3.444E-10*x3−5.329E-06*x2+2.611E-02*x+7.7)±10% and above the equation E2min/Et=(E2max/Et−6.5)±10%;
a third radiant flux E3 within the wavelength range of 600-780 nm, relative to a total radiant flux Et in the wavelength range of 380-780 nm is below the equation E3max/Et=(−2.988E-10*x3+5.192E-06*x2−3.294E-02*x+103)±10% and above the equation E3min/Et=(E3max/Et−6.5)±10%; and
wherein x is the correlated color temperature, which is selected from the range of 1800-4500 K; and
the color rendering index is at least 70; and
the red color rendering index (R9) is above the equation R9,min=(7.84E-11*x3−2.54E-06*x2+2.77E-02*x−90)±10%.

### Claim 2 (depends on 1)

The light generating system according to claim 1, wherein the correlated color temperature of the system light (1001) is selected from the range of 2000-4000 K and the red color rendering index (R9) is larger than 0.

### Claim 3 (depends on 1)

The light generating system according to claim 1, wherein the correlated color temperature of the system light is selected from the range of at maximum 3000 K.

### Claim 4 (depends on 1)

The light generating system according to claim 1, wherein the system light has chromaticity coordinates selected from one of the ANSI extended CCT categories between 2200 K and 4500 K.

### Claim 5 (depends on 1)

The light generating system according to claim 1, wherein the first luminescent material comprises a luminescent material of the type A3B5O12: Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

### Claim 6 (depends on 1)

The light generating system according to claim 1, wherein the second luminescent material comprises a first orange-red emitting luminescent material configured to generate luminescent material light having a peak wavelength selected from the range of 600-650 nm and having a full width half maximum selected from the range of 60-100 nm; wherein the first orange-red emitting luminescent material comprises a divalent europium doped nitride luminescent material.

### Claim 7 (depends on 6)

The light generating system according to claim 6, comprising the first orange-red emitting luminescent material and the second light generating device.

### Claim 8 (depends on 1)

The light generating system according to claim 1, wherein the second luminescent material comprises a second orange-red emitting luminescent material comprising M′xM2-2xAX6 doped with tetravalent manganese, wherein M′ comprises an alkaline earth cation, wherein M comprises a cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine.

### Claim 9 (depends on 1)

The light generating system according to claim 1, wherein the second luminescent material comprises a second orange-red emitting luminescent material comprising a quantum structure based luminescent material.

### Claim 10 (depends on 1)

The light generating system according to claim 1, wherein the one or more light generating devices comprise a second light generating device configured to generate second device light having a peak wavelength in the wavelength range of 600-680 nm; wherein the second light generating device comprises a solid state light source.

### Claim 11 (depends on 1)

The light generating system according to claim 1, wherein the luminous efficacy of radiation (LER) of the system light is above the equation LERmin=0.95*(−5.946E-13*x4+1.247E-08*x3−9.622E-05*x2+3.115E-01*x+6.0).

### Claim 12 (depends on 1)

The light generating system according to claim 1, wherein the system light complies with:
the area F1 in the CIE 1976 u′v′ chromaticity space enclosed by the 85 test-color samples of the Farnsworth-Munsell 100 (FM100) Hue Test has a value smaller than given by the equation F1max=−5.519E-15*x3−4.380E-11*x2+1.724E-06*x+1.17E-03 and a larger value than given the equation F1min=F1max−1.67E-03;
the first radiant flux E1 within the wavelength range of 380-490 nm, relative to a total radiant flux Et in the wavelength range of 380-780 nm is below the equation E1max/Et=3.207E-11*x3−1.097E-06*x2+1.297E-02*x−10.3 and above the equation E1min/Et=E1max/Et−6.5;
the second radiant flux E2 within the wavelength range of 491-600 nm, relative to a total radiant flux Et in the wavelength range of 380-780 nm is below the equation E2max/Et=3.444E-10*x3−5.329E-06*x2+2.611E-02*x+7.7 and above the equation E2min/Et=E2max/Et−6.5;
the third radiant flux E3 within the wavelength range of 600-780 nm, relative to a total radiant flux Et in the wavelength range of 380-780 nm is below the equation E3max/Et=−2.988E-10*x3+5.192E-06*x2−3.294E-02*x+103 and above the equation E3min/Et=E3max/Et−6.5; and
the red color rendering index (R9) is above the equation R9,min=7.84E-11*x3−2.54E-06*x2+2.77E-02*x−90.

### Claim 13 (depends on 1)

A lighting device selected from the group of a lamp (1), a luminaire (2), a projector device (3), a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system according to claim 1.

### Claim 14 (depends on 13)

A street lighting device comprising the lighting device according to claim 13.

### Claim 15 (depends on 1)

Use of the light generating system according to claim 1 for street lighting, retail lighting, shop window lighting, general purpose lighting, and façade lighting.