Marbled meat module using a narrow green phosphor, KSF, and a red nitride phosphor

Abstract

The invention provides a light generating system (1000) comprising a first solid state light source (10) and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 380-490 nm; (B) the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210), a second luminescent material (220), and a third luminescent material (230); (C) the first luminescent material (210) comprises a luminescent material of the type M'xM2-2xAX6:Mn4+, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); (D) the second luminescent material (220) comprises one or more of a divalent europium comprising nitride luminescent material, a divalent europium comprising oxynitride luminescent material, and a luminescent material of the type M1−xLi3−2y(Al1-bGab)1+2y−zSizO4−4y−zN4y+z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca; wherein the second luminescent material (220) is configured to convert at least part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221); (E) the third luminescent material (230) is configured to convert at least part of the first light source light (11) received by the third luminescent material (230) into third luminescent material light (231); wherein the third luminescent material light (231) has a third centroid wavelength (λc3) selected from the range of 500-560 nm; wherein the third luminescent material light (231) comprises at least one emission band having a third full width at half maximum FWHM3 selected from the range of 20-80 nm; and (F) the light generating system (1000) is configured to generate system light (1001), wherein the system light (1001) comprises the first luminescent material light (211), the second luminescent material light (221), and the third luminescent material light (231); wherein the system light (1001) is white light having a correlated color temperature of 2000-4000 K and a color point with a distance to the black body locus of Duv ≤ -0.01.

Description

[0001] 2024PF80377

[0002] 1

[0003] MARBLED MEAT MODULE USING A NARROW GREEN PHOSPHOR, KSF, AND A RED NITRIDE PHOSPHOR

[0004] FIELD OF THE INVENTION

[0005] The invention relates to a light generating system. The invention further relates to a display arrangement comprising such light generating system. Additionally, the invention relates to a lighting device comprising the light generating system. Further, the invention relates to a use of the light generating system.

[0006] BACKGROUND OF THE INVENTION

[0007] Light generating systems are known in the art. For instance, US2024120448A1 describes a red-light emitting device comprising: a blue LED chip; and a photoluminescence material comprising a narrowband red fluoride phosphor and a broadband red phosphor. The narrowband red phosphor may comprise a manganese-activated fluoride phosphor of composition K2SiF6:MMn4+, K2GeF6:MMn4+, and K2TiF6:MMn4+.

[0008] US2020 / 321494A1 discloses a white LED having a red phosphor, comprising a first red phosphor and a second red phosphor, having an adjustable color point. The first red phosphor is having a structural formula M2AX6: Mn4+, wherein the element M is selected from Li, Na, K, Rb or Cs, the element A is selected from Ti, Si, Ge or Zr, and the element X is selected from F, Cl or Br. The adjustable colored point of a device including M2AX6: Mn4+ phosphor is achieved by adding a second red phosphor having a different wavelength to the M2AX6: Mn4+ phosphor.

[0009] US2013 / 277694A1 discloses a semiconductor light-emitting device which emits light with high chroma that comprises an LED chip as a semiconductor light-emitting element and a phosphor which uses the LED chip as an excitation source to emit light. The phosphor contains at least a green phosphor and a red phosphor.

[0010] US2017 / 335186A1 discloses a light emitting device package for generating white light and that has a phosphor composition that includes a green phosphor excited by blue light to emit green light, a first red phosphor of a nitride series which is excited by the blue light and emits first red light and a second red phosphor of a fluorine series which is excited by the blue light and emits second red light. 2024PF80377

[0011] 2

[0012] SUMMARY OF THE INVENTION

[0013] Conventional light generating systems (e.g. incandescent or fluorescent lamps) are rapidly being replaced by light emitting diode (LED) based lighting solutions. LED-based lighting solutions may generally comprise a light source and a luminescent converter, wherein the luminescent converter may comprise multiple types of phosphors, e.g. a yellow and a red phosphor, to produce especially white light with a suitable color temperature. Yet, for certain applications, specific restrictions to the spectral power distribution of the light may be imposed. For instance, in the food industry, certain foodstuffs may appear tastier or more fresh under a light source providing light with a certain spectral power distribution. Such specialty light sources may therefore be in demand in e.g. supermarkets, grocery stores, bakeries, butchers, dairy shops, etc.. However, specialty light sources may generally be less efficient than light sources for general illumination, leading to a higher energy demand and / or more energy loss through heat. Hence, it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0014] According to a first aspect, the invention provides a light generating system comprising a first solid state light source and a luminescent converter. The first solid state light source may be configured to generate first light source light having a first peak wavelength (kpi ). In embodiments, the first peak wavelength (kp i ) may be selected from the range of 380-500 nm, such as from the range of 380-490 nm. Further, the luminescent converter may be configured in a light receiving relationship with the first solid state light source. In embodiments, the luminescent converter may comprise a first luminescent material, a second luminescent material, and a third luminescent material. The first luminescent material may comprise (such as especially be) a luminescent material of the type M’xM2-2xAX6 Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Further, the first luminescent material may be configured to convert at least part of the first light source light received by the first luminescent material into first luminescent material light. In embodiments, the first luminescent material light may have a first centroid wavelength (λc1) selected from the range 2024PF80377

[0015] 3

[0016] of 600-660 nm, such as from the range of 610-650 nm. Further, the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHMi of < 55 nm, such as < 45 nm. The second luminescent material may comprise (such as especially be) one or more of a divalent europium comprising nitride luminescent material and a divalent europium comprising oxynitride luminescent material. Additionally or alternatively, the second luminescent material may comprise (such as especially be) a luminescent material of the type M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6. Further, the second luminescent material may be configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light. In embodiments, the second luminescent material light may have a second centroid wavelength (λC2) selected from the range of 600-660 nm, such as from the range of 610-650 nm. Further, the second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2 of > 35 nm, such as > 45 nm. The third luminescent material may be configured to convert at least part of the first light source light received by the third luminescent material into third luminescent material light. Especially, the third luminescent material light may have a third centroid wavelength (λc3) selected from the range of 500-570 nm, such as from the range of 500-560 nm. Further, the third luminescent material light may comprise at least one emission band having a third full width at half maximum FWHM3 selected from the range of 15-90 nm, such as from the range of 20-80 nm. In embodiments, the light generating system may be configured to generate system light. Especially, the system light may comprise the first luminescent material light, the second luminescent material light, and the third luminescent material light. Further, the system light may be white light. In specific embodiments, the (white) system light may have a correlated color temperature of 1500-4500 K, such as 2000-4000 K. Additionally or alternatively, in specific embodiments, the system light may have a color point with a distance to the black body locus of Duv < -0.005, such as Duv < -0.01.

[0017] Hence, in specific embodiments, the invention provides a light generating system comprising a first solid state light source and a luminescent converter, wherein: (A) the first solid state light source is configured to generate first light source light having a first peak wavelength (λp1) selected from the range of 380-490 nm; (B) the luminescent converter is configured in a light receiving relationship with the first solid state light source; wherein the luminescent converter comprises a first luminescent material, a second luminescent 2024PF80377

[0018] 4

[0019] material, and a third luminescent material; (C) the first luminescent material comprises a luminescent material of the type M’xM2-2xAX6: MMn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material is configured to convert at least part of the first light source light received by the first luminescent material into first luminescent material light; (D) the second luminescent material comprises one or more of a divalent europium comprising nitride luminescent material, a divalent europium comprising oxynitride luminescent material, and a luminescent material of the type M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6; wherein the second luminescent material is configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light; (E) the third luminescent material is configured to convert at least part of the first light source light received by the third luminescent material into third luminescent material light; wherein the third luminescent material light has a third centroid wavelength (Acs) selected from the range of 500-560 nm; wherein the third luminescent material light comprises at least one emission band having a third full width at half maximum FWHMs selected from the range of 20-80 nm; and (F) the light generating system is configured to generate system light, wherein the system light comprises the first luminescent material light, the second luminescent material light, and the third luminescent material light; wherein the system light is white light having a correlated color temperature of 2000-4000 K and a color point with a distance to the black body locus of Duv < -0.01. Such a light generating system may provide light being especially suited for the illumination of marbled meats (e.g. serrano ham, prosciutto, salami, etc.), i.e., (red) meats comprising fat dispersed (and / or intermingled) through the (lean) meat. Especially, such a light generating system may highlight the fat in the marbled meats, while (simultaneously) oversaturating the red color in the (lean) meat, thereby facilitating that the marbled meat may appear especially fresh and / or tasty. Further, such a light generating system may be especially efficient and / or compact compared to prior art systems for the illumination of marbled meats.

[0020] The light generating system may comprise the first solid state light source. The first solid state light source may be selected from the group comprising a light emitting diode (LED), a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). Yet, in specific embodiments, 2024PF80377

[0021] 5

[0022] the first solid state light source may be selected from the group of a light emitting diode, a laser diode, a superluminescent diode, and a stacked multi -junction diode. Such solid state light sources may be relatively compact, yet may further provide light with a relatively high radiance. The first solid state light source may be configured to generate first light source light. The first light source light may have a first peak wavelength (kpi ) selected from the range of 380-500 nm, such as from the range of 380-490 nm, especially from the range of 400-490 nm, like from the range of 430-490 nm, especially from the range of 440-490 nm. Hence, the first light source light may be one of violet light and blue light, such as especially blue light. The term “violet light”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. The term “blue light”, and similar terms, may especially relate to light having a wavelength in the range of about 440-490 nm. The term “peak (emission) wavelength”, and similar terms, may refer to the wavelength where the radiometric emission spectrum of the light source reaches its maximum, i.e., the peak wavelength may denote the wavelength at which the largest (emission intensity) value is found in a graph of the spectral power distribution. The peak emission wavelength may especially be determined at room temperature.

[0023] The light generating system may further comprise a luminescent converter. The luminescent converter may be configured in a light receiving relationship with the first solid state light source. Especially, the luminescent converter may be configured downstream from the first solid state light source. The terms “downstream” and “upstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here especially the solid state light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. The luminescent converter may be configured in physical contact with and covering (a light escape surface of) the first solid state light source. That is, the luminescent converter may be configured as a coating (on the first solid state light source). Alternatively, the luminescent converter may be configured as a self-supporting luminescent body. In such embodiments, the luminescent converter may be configured: (i) in physical contact with the first solid state light source, or (ii) at a non-zero distance di from (the light escape surface of) the first solid state light source. The non-zero distance di may be selected from the range of > 5 pm, such as from the range of > 10 pm, especially from the range of > 25 pm. Additionally or alternatively, the non-zero distance di may be selected from the range of < 10 cm, such as 2024PF80377

[0024] 6

[0025] from the range of < 5 cm, especially from the range of < 1 cm. Hence, in specific embodiments, the luminescent converter may be physically separated from the first solid state light source.

[0026] The luminescent converter may comprise one or more luminescent materials. Especially, the luminescent converter may comprise the first luminescent material, the second luminescent material, and the third luminescent material. Here below, some general embodiments relating to the (first, second, and / or third) luminescent material(s) are provided. The term “luminescent material” may especially refer to a material that can convert first radiation, especially one or more of UV radiation, violet radiation, blue radiation, and green radiation, into second radiation. Herein, UV (ultraviolet) may refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm, though other wavelengths may also be possible. The term “green light”, and similar terms, may especially relate to light having a wavelength in the range of about 490-560 nm. The first radiation and second radiation may have different spectral power distributions, with the second radiation generally having a spectral power distribution at larger wavelengths than the first radiation (i.e. “downconversion”). In embodiments, the “luminescent material” may especially refer to a material that can convert radiation into e.g. visible and / or infrared light. The terms “visible light” or “visible emission”, and similar terms, refer to light having one or more wavelengths in the range of about 380-780 nm. Further, IR (infrared) may especially refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength of < 1500 nm, like a wavelength of > 900 nm, though other wavelengths may be possible.

[0027] For instance, the luminescent material may be able to convert one or more of UV radiation, blue radiation, and green radiation, into visible light. Hence, upon excitation with radiation, the luminescent material may emit radiation. In general, the luminescent material will be a down converter, i.e. radiation with a smaller wavelength is converted into radiation with a larger wavelength (Xex< Xem). In embodiments, the term “luminescence” may refer to phosphorescence. In embodiments, the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “luminescent material light” or “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. Likewise, the term “luminescent material” may in embodiments refer to phosphorescence and / or fluorescence. The term “luminescent material” may also refer to a plurality of different luminescent materials. Examples of possible luminescent materials are indicated below. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material 2024PF80377

[0028] 7

[0029] composition. Instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art.

[0030] In embodiments, luminescent materials may be selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively. The term “nitride” may also refer to oxynitride or nitridosilicate, etc. Alternatively or additionally, the luminescent material(s) may be selected from silicates, especially doped with divalent europium. In embodiments, the luminescent material may comprise a divalent europium comprising oxynitride luminescent material. Further, in embodiments, the luminescent material may comprise a divalent europium comprising nitride luminescent material.

[0031] In embodiments, the luminescent material may comprise 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; and wherein the light source light may comprise blue light source light. Especially, A may comprise one or more of Y, Gd and Lu, such as especially one or more of Y and Lu. Especially, B may comprise one or more of Al and Ga, more especially at least Al, such as essentially entirely Al. Hence, especially suitable luminescent materials are cerium comprising garnet materials. Embodiments of garnets especially include A3B5O12 garnets, wherein A comprises at least yttrium (Y) or lutetium (Lu) and wherein B comprises at least aluminum (Al). Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce. Especially, B may comprise aluminum (Al), with optionally gallium (Ga) and / or scandium (Sc) and / or indium (In) up to about 20% of B, more especially up to about 10 % of B (i.e. the B ions essentially consist of > 90 mole % of Al and < 10 mole % of one or more of Ga, Sc, and In). B may especially comprise up to about 10% gallium. In another variant, B and O may at least partly be replaced by Si and N. The element A may especially be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu). Further, Gd and / or Tb are especially only present up to an amount of about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Yi-xLux)3B50i2: Ce, wherein 0 < x < 1. The term “: Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. This is known to the person skilled in the art. Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, especially 0.1 to 2% (relative to A). Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art. In embodiments, such luminescent materials may have a suitable spectral distribution, have a relatively high efficiency, and have a relatively high thermal stability. 2024PF80377

[0032] 8

[0033] In specific embodiments, the luminescent material may comprise (YxiA’X2CeX3)3(AlyiB’y2)5Oi2. Here, A’ comprises one or more elements selected from the group consisting of lanthanides, and B’ comprises one or more elements selected from the group of Ga, In and Sc, wherein xl+x2+x3=l, wherein x3>0, wherein 0<x2+x3<0.2, wherein yl+y2=l, wherein 0<y2<0.2. Especially, x3 is selected from the range of 0.001-0.1. Note that in embodiments x2=0. Alternatively or additionally, in embodiments y2=0.

[0034] In embodiments, the luminescent material may comprise a luminescent material of the type A3Si6N11:Ce3+, wherein A comprises one or more of Y, La, Gd, Tb and Lu, such as in embodiments one or more of La and Y. In embodiments, the luminescent material may alternatively or additionally comprise one or more of MS:Eu2+and / or LSi3N5:Eu2+and / or MAlSiN3:Eu2+and / or Ca2AlSi3O2N3:Eu2+, etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba, Sr, Ca)S: Eu, (Ba, Sr, Ca)AlSiN3: Eu and (Ba, Sr, Ca)2SisN8: Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations, as is known to the person skilled in the art. In general, Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces. The term “: Eu”, indicates that part of the metal ions (indicated by M) is replaced by Eu (in these examples by Eu2+). For instance, assuming 2% Eu in CaAlSi Eu, the correct formula could be (Cao.98Euo.o2)AlSiN3.

[0035] The term “luminescent material” herein especially relates to inorganic luminescent materials. Alternatively or additionally, also other luminescent materials may be applied. For instance quantum dots and / or organic dyes may be applied and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc.

[0036] In embodiments, the luminescent material may comprise a luminescent material of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux. Herein, M may comprise one or more of magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba), such as especially one or more of Ca, Sr, and Ba. Hence, M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Euxmay especially refer to (Mg, Ca, Sr, Ba)i-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux. Such a luminescent material may be indicated as an SLA-type phosphor, or SLA phosphor. Luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Euxmay be described in US2021171827A1, which is hereby herein incorporated by reference. In M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux, x may be selected from the range of 0 < x < 0.1, such as from the range of 0.0005 < x < 0.08, especially 2024PF80377

[0037] 9

[0038] from the range of 0.001 < x < 0.05. Hence, europium (Eu) may not replace more than 10% of the cation M, and may substantially or only be in the divalent state (Eu2+), as is known to the person skilled in the art. Further, in Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, y may be selected from the range of 0 < y < 1, such as from the range of 0 < y < 0.75, especially from the range of 0 < y < 0.6. In specific embodiments, y = 0. In Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, z may be selected from the range of 0 < z < 0.1, such as from the range of 0 < z < 0.07, especially from the range of 0 < z < 0.05. Hence, in embodiments, in an SLA phosphor, SiN may replace A1O to a maximum of 10 mole%. In embodiments, an SLA phosphor may crystallize in a UCr4C4 type crystal structure. Hence, the luminescent material may comprise a luminescent material of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Ca, Sr, and Ba, wherein 0 < x < 0.04, wherein 0 < y < 1, wherein 0 < z < 0.05, and wherein y + z < 1.

[0039] In embodiments, part of the Al in the SLA phosphor may be replaced by gallium (Ga). Hence, the luminescent material may comprise a luminescent material of the type Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Eux, wherein M may comprise one or more of Mg, Ca, Sr, and Ba, and x, y, and z may be as indicated above. Such a luminescent material may be indicated as an SLGA phosphor, especially in embodiments wherein b > 0. In embodiments, b in the formula Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Euxmay be selected from the range of > 0, such as from the range of > 0.05, especially from the range of > 0.1, like from the range of > 0.15. Additionally or alternatively, b may be selected from the range of < 0.6, such as from the range of < 0.5, especially from the range of < 0.4, like from the range of < 0.3. Especially, 0 < b < 0.6 may apply, such as 0.05 < b < 0.5, especially 0.1 < b < 0.3, like 0.15 <b < 0.3.

[0040] Further, the luminescent material may comprise a SiAlON phosphor, such as selected from the group comprising (a) Si12-m-nAlm+nOnN16-n:Eu2+(a-SiA10N), (b) Si6-nAlnOnN8-n:Eu2+, wherein 0 < n < 4.2 (P-SiAlON), and (c) Si2-nAlnO1+nN2-n:Eu2+, wherein 0 < n < 0.2 (O-SiAlON).

[0041] In embodiments, the luminescent material may comprise a tetravalent manganese-comprising luminescent material, i.e., a luminescent material doped with tetravalent manganese. Especially, in embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x may be selected from the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, and wherein X comprises a monovalent anion, at least 2024PF80377

[0042] 10

[0043] comprising fluorine. Such luminescent materials may herein also be indicated as “KSiF” or “KSF”, regardless of the composition of M’, M, A, and X. A luminescent material of the type M’XM2-2XAX6 doped with tetravalent manganese is amongst others described in WO2013121355A1, which is herein incorporated by reference. Passages from WO2013121355A1 are also copied herein. In embodiments, the alkaline earth cation M’ may comprise one or more of magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba. Further, the alkaline cations M may comprise one or more of sodium (Na), potassium (K) and rubidium (Rb). Optionally, M may (further) comprise one or more of ammonium (NH₄), lithium (Li), and cesium (Cs). In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. The phrase “wherein M comprises at least potassium” indicates for instance that of all M cations in a mole M’xM2-2xAX6, a fraction comprises K+and an optionally remaining fraction comprises one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’xM2-2xAX6 luminescent material has the hexagonal phase. In yet another embodiment, the M’xM2-2xAX6 luminescent material has the cubic phase. In an embodiment, a combination of different alkaline cations M may be applied. In yet another embodiment, a combination of different alkaline earth cations M’ may be applied. In yet another embodiment, a combination of one or more alkaline cations M and one or more alkaline earth cations M’ may be applied. For instance, KRbo.sSro^sAXe might be applied. As indicated above, x in the formula M’xM2-2xAX6 may be selected from the range of 0-1, especially x < 1. In specific embodiments, x = 0.

[0044] The term “tetravalent manganese” refers to MMn4+. This is a well-known luminescent ion. In the formula as indicated above, part of the tetravalent cation A (such as Si) is being replaced by manganese. Hence, M’xM2-2xAX6 doped with tetravalent manganese may also be indicated as M’xM2-2xAi-mMnmX6 (or M’xM2-2xAX6: MMn4+). The mole percentage of manganese, i.e. the percentage it replaces the tetraval ent cation A will in general be in the range of 0.1-15 %, especially 1-12 %, i.e. m is in the range of 0.001-0.15, especially in the range of 0.01-0.12. As manganese replaces part of a host lattice ion and has a specific function, it is also indicated as “dopant” or “activator”. Hence, the hexafluorosilicate is doped or activated with manganese (MMn4+).

[0045] In embodiments, A may comprise a tetravalent cation, and preferably at least comprises silicon. A may optionally (further) comprise one or more of titanium (Ti), germanium (Ge), tin (stannum) (Sn) and zinc (Zn). Further, A may comprise one or more of 2024PF80377

[0046] 11

[0047] zirconium (Zr), and hafnium (Hf). Preferably, at least 80%, even more preferably at least 90%, such as at least 95% of A consists of silicon. In a specific embodiment, M’xM2-2xAX6 can also be described as (Ki-r-i-n-c-nhRbrLiiNanCsc(NH4)nh)2AX6, wherein r is in the range of 0-1, wherein l,n,c,nh are each individually preferably in the range of 0-1, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05, and wherein r+l+n+c+nh is in the range of 0-1, especially 1+n+c+nh < 1, especially < 0.2, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05. X is preferably fluorine (F). Further, in a specific embodiment, M’xM2-2xAX6 can also be described as MgmgCacaSrsrBaba(KkRbrLilNanCsc(NH4)nh)2AX6, with k, r, 1, n, c, nh each individually being in the range of 0-1, wherein mg, ca, sr, ba are each individually in the range of 0-1, and wherein mg+ca+sr+ba+k+ r+ l+n+c+nh=l. In embodiments, k=l, and the others (mg, ca, sr, ba, r, 1, n, c, nh) are zero.

[0048] As indicated above, X relates to a monovalent anion, but at least comprises fluorine. Other monovalent anions that may optionally be present may be selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I). Preferably, at least 80%, even more preferably at least 90%, such as 95% of X consists of fluorine. Hence, in a specific embodiment, M’xM2-2xAX6 can also be described as M'xM2-2xA(F1-cl-b-iClclBrbIi)6, wherein cl,b,i are each individually preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05, and wherein cl+b+i < 1, especially < 0.2, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05. Hence, M’xM2-2xAX6 can also be described as (K1-r-l-n-c-nhRbrLilNanCsc(NH4)nh)2Si1-m-t-g-s-zrMnmTitGegSnsZrzr(F1-cl-b-iClclBrbIi)6, with the values for r,l,n,c,nh,m,t,g,s,zr,cl,b,i as indicated above.

[0049] In an embodiment, M’xM2-2xAX6 comprises K2SiF6 (indicated herein also as KSiF system). In another preferred embodiment, M’xM2-2xAX6 comprises KRbSiF6 (herein also indicated as K, Rb system). In specific embodiments, the indication M’xM2-2xAX6 may refer to one or more of (K, Rb)2SiFe: MMn4+, (K, Rb)2TiFe: MMn4+, K2(Si, Ti)Fe: MMn4+, and Rb2(Si, Ti)Fe: MMn4+, such as one or more of K2TiFe: MMn4+, of K2SiFe: MMn4+, and of Rb2SiFe: MMn4+. As can be derived from the above, “(Si, Ti)” may indicate one or more of Si and Ti. Hence, in specific embodiments, the luminescent material may comprise one or more of (K, Rb)2SiFe: MMn4+and K2(Si, Ti)Fe: MMn4+. The luminescent material may also be coated, as also described in WO2013121355A1.

[0050] Hence, when M (or A) in chemical formulas refer to n different elements, this may imply that the relevant formula may comprise for the M (or A) position in the formula 2024PF80377

[0051] 12

[0052] essentially any permutation of the n different elements. For instance, when M=Ba, Sr, Ca, or when M comprises one or more of Ba, Sr, Ca, i.e. n=3, this may imply that in the formula Ba, Sr, Ca, (BaxSry), (BaxCay), (CaxSry), or (BaxSryCaz), may be available, wherein in general x+y+z=1. Referring to e.g. M’xM2-2XAXe, this may refer to e.g. one or more of K2SiFe: MMn4+and of Rb2SiF6: MMn4+, or (KxRby)2SiFe: MMn4+, etc. Referring to (Ba, Sr, Ca)AlSiN3: Eu, this may imply BaAlSiN3: Eu, SrAlSiN3: Eu, CaAlSiN3: Eu, (BaxSry)AlSiN3: Eu, (BaxCay)AlSiN3: Eu, (CaxSry)AlSiN3: Eu, or (BaxSryCaz)AlSiN3: Eu. Referring to e.g. A3B5O12:Ce, wherein A in embodiments comprises one or more of Y, La, Gd, Tb and Lu, this may imply YsBsO Ce, La3BsOi2: Ce, GdBsOniCe, TbsBsOniCe, LusBsOniCe, but also e.g. (Yx, Gdy)3B5O12: Ce, (Yx, Luy)3B5O12: Ce, (Gdx, Luy)3B5O12: Ce, (Yx, Gdy, Luz)3B5O12: Ce, etc. etc., with hereby only limiting for the sake of economy to unary, binary, and ternary examples, though quaternary and higher examples are not excluded herein. Further, indications like “K, Rb” or Ba, Sr, Ca, and similar indications (see also above), may indicate one or more of such elements. Hence, (K, Rb)2SiFe: MMn4+, may e.g. refer to K2SiFe: MMn4+and of Rb2SiFe: MMn4+, or (KxRby)2SiFe: MMn4+. Also herein in general x+y=l. Hence, when M (or A) may refer to n different elements, with n being at least two, 2n-1 permutations may in principle be possible.

[0053] As indicated above, the luminescent converter may comprise the first luminescent material. The first luminescent material may comprise (such as be) a luminescent material of the type M’xM2-2XAXe: MMn4+(or “M’xM2-2XAX6 doped with tetravalent manganese”), wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Especially, M in the formula M’XM2-2XAXe: MMn4+may comprise an alkaline cation. Hence, in specific embodiments, the first luminescent material may comprise a luminescent material of the type M’xM2-2XAXe: MMn4+, wherein M comprises an alkaline cation. Further, in embodiments, the first luminescent material may comprise a luminescent material of the type M2AXe: MMn4+, wherein M comprises an alkaline cation, x is in the range of 0-1, wherein A comprises a tetraval ent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine.

[0054] The first luminescent material may comprise one or more further (types of) luminescent materials, such as selected from the (types of) luminescent materials provided above. Additionally or alternatively, the first luminescent material may comprise one or more luminescent materials of the type M’xM2-2XAXe: MMn4+, wherein the one or more luminescent 2024PF80377

[0055] 13

[0056] materials of the type M’xM2-2xAX6: MMn4+may differ in the composition of M and / or the composition of A. Especially, the first luminescent material may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of luminescent materials of the type M’xM2-2xAX6: MMn4+.

[0057] As indicated above, M (in the formula M’xM2-2xAX6: MMn4+) may comprise an alkaline cation. Especially, M may comprise one or more of K and Na, such as at least K, or such as at least Na. Further, A (in the formula M’xM2-2xAX6: MMn4+) may comprise one or more of Si and Ti, such as at least Si, or such as at least Ti. Hence, in embodiments, the first luminescent material may comprise (KyNai-y)2(SixTii-x)F6: MMn4+. In such embodiments, x may be selected from the range of > 0, such as from the range of > 0.2, especially from the range of > 0.4. Additionally or alternatively, x may be selected from the range of < 1, such as from the range of < 0.9, especially from the range of < 0.8. Hence, in embodiments, 0 < x < 1 may apply, such as 0.2 < x < 0.9, especially 0.4 < x < 0.8. Further, in embodiments, y may be selected from the range of < 1, such as from the range of < 0.9, especially from the range of < 0.8. Additionally or alternatively, y may be selected from the range of > 0, such as from the range of > 0.2, especially from the range of > 0.4. That is, in embodiments, 0 < y < 1 may apply, such as 0.2 < y < 0.9, especially 0.4 < y < 0.8. Hence, in specific embodiments, the first luminescent material may comprise (KyNai-y)2(SixTii-x)F6: MMn4+, wherein 0 < y < 1 and 0 < x < 1. Such a first luminescent material may especially provide (narrowband) first luminescent material light having intensity in the red wavelength range (see below). Further, such a first luminescent material may be able to convert first light source light into first luminescent material light relatively efficiently.

[0058] The first luminescent material may be configured to convert at least part of the first light source light received by the first luminescent material into first luminescent material light. Further, the first luminescent material may be configured to convert at least part of the first light source light received by the luminescent converter into first luminescent material light. Especially, the first luminescent material may be configured to convert at least 2%, such as at least 5%, especially at least 7%, of the first light source light received by the luminescent converter into first luminescent material light. Additionally or alternatively, the first luminescent material may be configured to convert at most 20%, such as at most 15%, especially at most 12%, of the first light source light received by the luminescent converter into first luminescent material light.

[0059] The first luminescent material light may have a first centroid wavelength (λc1). The term “centroid wavelength”, also indicated as c, is known in the art, and refers to the 2024PF80377

[0060] 14

[0061] wavelength value (in nm) where half of the light energy is at shorter and half the energy is at longer wavelengths. It is the wavelength that divides the integral of a spectral power distribution into two equal parts as expressed by the formula λc = Σ λ*I(λ) / (Σ I(λ)), where the summation is over the wavelength range of interest, and I(X) is the spectral energy density (i.e. the integration of the product of the wavelength and the intensity over the emission band normalized to the integrated intensity). The centroid wavelength may e.g. be determined at operation conditions. In embodiments, the first centroid wavelength (λc1) may be selected from the range of 600-660 nm, such as from the range of 610-650 nm, especially from the range of 620-640 nm, like from the range of 625-635 nm. Hence, in embodiments, the first luminescent material light may comprise, such as be, one or more of orange light and red light, such as especially red light. The terms “orange light” or “orange emission”, and similar terms, may especially relate to light having a wavelength in the range of about 590-620 nm. The terms “red light” or “red emission”, and similar terms, may especially relate to light having a wavelength in the range of about 620-780 nm.

[0062] Further, the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHMi of < 55 nm, such as < 45 nm, especially < 35 nm, like < 25 nm. Additionally or alternatively, the first luminescent material light may comprise the at least one emission band having the first full width at half maximum FWHMi of > 1 nm, such as > 3 nm, especially > 5 nm. In embodiments, the first luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the first full width at half maximum FWHMi. Additionally or alternatively, the first luminescent material light may comprise a plurality of emission bands, wherein essentially all of the emission bands may have the first full width at half maximum FWHMi. The term “emission band” may refer to the emission (spectral power distribution) resulting from a radiative transition of electrons from (vibrational levels of) a first higher-energy excited state to (vibrational levels of) a second lower-energy (ground) state, wherein a larger number of vibrational levels in (one or more of) the first excited state and second (ground) state results in a broader emission band (spanning a larger wavelength range). Further, the term “full width at half maximum” (or “FWHM”) refers to the width of (the spectral power distribution of) the emission band at half the maximum intensity of said emission band. The FWHM of an emission band may especially be determined at room temperature.

[0063] The light generating system, such as especially the luminescent converter, may further comprise the second luminescent material. The second luminescent material may comprise any (combination) of the luminescent materials indicated above. The second 2024PF80377

[0064] 15

[0065] luminescent material may comprise (such as be) one or more of a divalent europium comprising nitride luminescent material and a divalent europium comprising oxynitride luminescent material. Especially, the second luminescent material may comprise (such as be) one or more of M2Si5N8: Eu2+and MAlSiN3: Eu2+. Additionally or alternatively, the second luminescent material may comprise (such as be) a luminescent material of the type

[0066] M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca. Especially, the second luminescent material may comprise (such as be) M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Ba, Sr, and Ca. In such embodiments, 0 < x < 0.1 may apply, such as 0.0005 < x < 0.08, especially 0.001 < x < 0.05. Alternatively, 0 < x < 0.04 may apply. Further, in such embodiments, 0 < y < 1 may apply, such as 0 < y < 0.75, especially 0 < y < 0.6. Additionally, in such embodiments, 0 < z < 0.1 may apply, such as 0 < z < 0.07, especially 0 < z < 0.05. As indicated above 0 < b < 0.6 may apply, such as especially 0.1 < b < 0.3. Further, in embodiments, y + x < 1 may apply. Hence, in specific embodiments, the second luminescent material may comprise one or more of M2Si5N8: Eu2+, MAlSiN3: Eu2+, and M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Ba, Sr and Ca, wherein 0 < x < 0.04, wherein 0 < y < 1, wherein 0 < z < 0.05, wherein 0 < b < 0.6, and wherein y + z < 1. Such a second luminescent material may especially provide (broadband) second luminescent material light having intensity in the red wavelength range (see below). Further, such a second luminescent material may be relatively thermally and chemically stable.

[0067] The second luminescent material may comprise one or more further (types of) luminescent materials, such as selected from the (types of) luminescent materials provided above. Yet, especially, the second luminescent material may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of one or more of M2Si5N8: Eu2+, MAlSiN3: Eu2+, and M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Ba, Sr and Ca, wherein 0 < x < 0.04, wherein 0 < y < 1, wherein 0 < z < 0.05, wherein 0 < b < 0.6, and wherein y + z < 1. Especially, the second luminescent material may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of MAlSiN3: Eu2+, wherein M comprises one or more of Ba, Sr and Ca.

[0068] The second luminescent material may be configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light. Further, the second luminescent material may be configured to convert at least part of the first light source light received by the luminescent converter into 2024PF80377

[0069] 16

[0070] second luminescent material light. In embodiments, the second luminescent material may be configured to convert > 15%, such as > 20%, especially > 30%, of (a spectral power of) the first light source light received by the luminescent converter into second luminescent material light. Additionally or alternatively, the second luminescent material may be configured to convert < 65%, such as < 60%, especially < 50%, of (a spectral power of) the first light source light received by the luminescent converter into second luminescent material light.

[0071] The second luminescent material light may have a second centroid wavelength (λc2). In embodiments, the second centroid wavelength (λc2) may be selected from the range of 600-660 nm, such as from the range of 610-650 nm, especially from the range of 620-650 nm. Hence, the second luminescent material light may be orange light or red light, such as especially red light. The second centroid wavelength (λC2) may be (roughly) equal to the first centroid wavelength (λc1). Especially, in embodiments, |Xc2- ci| < 20 nm (may apply), such as |Xc2- ci| < 15 nm, especially |Xc2- ci| < 10 nm. Additionally or alternatively, |Xc2- ci| > 2 nm (may apply), such as |Xc2- ci| > 5 nm, especially |Xc2- ci| > 7 nm. In embodiments, the second centroid wavelength (λC2) may be larger than the first centroid wavelength (λc1), such that 2 nm < Xc2- ci < 20 nm may apply, especially 5 nm < Xc2- ci < 15 nm, like 7 nm < λc2-λc1 < 10 nm.

[0072] Further, the second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2 of > 35 nm, such as > 45 nm, especially > 55 nm. Additionally or alternatively, the second luminescent material light may comprise the at least one emission band having a second full width at half maximum FWHM2 of < 140 nm, such as < 130 nm, especially < 120 nm. The second luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the second full width at half maximum FWHM2. Alternatively, the second luminescent material light may comprise a single emission band, wherein said emission band may have the second full width at half maximum FWHM2.

[0073] Hence, in specific embodiments, the light generating system may comprise a first solid state light source and a luminescent converter, wherein: (A) the first solid state light source may be configured to generate first light source light having a first peak wavelength (λp1) selected from the range of 380-490 nm; (B) the luminescent converter may be configured in a light receiving relationship with the first solid state light source; wherein the luminescent converter may comprise a first luminescent material, a second luminescent material, and a third luminescent material; (C) the first luminescent material may be configured to convert at least part of the first light source light received by the first 2024PF80377

[0074] 17

[0075] luminescent material into first luminescent material light; wherein the first luminescent material light may have a first centroid wavelength (λc1) selected from the range of 610-650 nm; wherein the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHMi of < 45 nm; (D) the second luminescent material may be configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light; wherein the second luminescent material light may have a second centroid wavelength (λc2) selected from the range of 610-650 nm; wherein the second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2 of > 45 nm; (E) the third luminescent material may be configured to convert at least part of the first light source light received by the third luminescent material into third luminescent material light; wherein the third luminescent material light may have a third centroid wavelength (λC3) selected from the range of 500-560 nm; wherein the third luminescent material light may comprise at least one emission band having a third full width at half maximum FWHM3 selected from the range of 20-80 nm; and (F) the light generating system may be configured to generate system light, wherein the system light may comprise the first luminescent material light, the second luminescent material light, and the third luminescent material light; wherein the system light may be white light having a correlated color temperature of 2000-4000 K and a color point with a distance to the black body locus of Duv < -0.01.

[0076] The light generating system, especially the luminescent converter, may further comprise the third luminescent material. The third luminescent material may comprise any (combination) of the luminescent materials indicated above. In embodiments, the third luminescent material may comprise (such as be) a divalent europium comprising thiogallate. The term “divalent europium comprising thiogallate” may herein refer to a luminescent material of the type MwAuXv: Eu2+1-w, wherein M comprises one or more of Mg, Sr, Ca, and Ba, wherein A comprises Ga and optionally one or more of Al, boron (B), In, Sc, Lu, and Y, wherein X comprises one or more of S, Se, O, and tellurium (Te), (such as especially at least S), wherein 0.01 < w < 0.99, wherein 2 < u < 4, and wherein 4 < v < 7. In embodiments, X in MwAuXv: Eu2+1-wmay especially comprise one or more of (i) S, (ii) Se, and (iii) S and Se. Additionally or alternatively, the third luminescent material may comprise (such as be) a divalent europium comprising thioaluminate. The term “divalent europium comprising thioalluminate” may herein refer to a luminescent material of the type MwAuXv: Eu2+1-w, wherein M comprises one or more of Mg, Sr, Ca, and Ba, wherein A comprises Al and optionally one or more of Ga, boron (B), In, Sc, Lu, and Y, such as at least Al, wherein X 2024PF80377

[0077] 18

[0078] comprises one or more of S, Se, O, and tellurium (Te), (such as especially at least S), wherein 0.01 < w < 0.99, wherein 2 < u < 4, and wherein 4 < v < 7. The third luminescent material may in specific embodiments comprise (a mixture of) a divalent europium comprising thiogallate and a divalent europium comprising thioaluminate. Further, the third luminescent material may comprise Mw(GatAli-t)uXv: Eu2+i-w, wherein M comprises one or more of Mg, Sr, Ca, and Ba, wherein X comprises one or more of S, Se, O, and tellurium (Te), (such as especially at least S), wherein 0.01 < w < 0.99, wherein 2 < u < 4, wherein 4 < v < 7, and wherein 0 < t < 1. Additionally or alternatively, the third luminescent material may comprise (such as be) a divalent europium comprising silicate. Especially, the divalent europium comprising silicate may comprise, such as be, (Sri.xBax)2SiO4: Eu2+, wherein 0 < x < 1, such as especially 0 < x < 1. In specific embodiments, x = 0.5 may apply, and the divalent europium comprising silicate may comprise, such as be, SrBaSiO4: Eu2+. Further, additionally or alternatively, the third luminescent material may comprise (such as be) a luminescent material of the type Si6-nAlnOnN8-n: Eu2+(i.e., a SiAlON phosphor). In such embodiments, especially 0 < n < 4.2 may apply (i.e., the SiAlON phosphor may be P-SiAlON). Hence, in embodiments, n = 0 may apply, and the third luminescent material may comprise Si6N8: Eu2+. Additionally or alternatively, n > 0 may apply, and at least part of the SiN in the third luminescent material (of the type Si6-nAlnOnN8-n: Eu2+) may be replaced by A1O. Hence, in specific embodiments, the third luminescent material may comprise one or more of a divalent europium comprising thiogallate, a divalent europium comprising thioaluminate, a divalent europium comprising silicate, and a luminescent material of the type Si₆₋ₙAlₙOₙN₈₋ₙ:Eu2+, wherein 0 ≤ n ≤ 4.2. Such a third luminescent material may especially provide third luminescent material light having a relatively high (spectral) intensity in the green wavelength range (see below), yet a relatively low (spectral) intensity in the yellow wavelength range (see below).

[0079] The third luminescent material may comprise one or more further (types of) luminescent materials, such as selected from the (types of) luminescent materials provided above. Yet, especially, the third luminescent material may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of one or more of a divalent europium comprising thiogallate, a divalent europium comprising thioaluminate, a divalent europium comprising silicate, and a luminescent material of the type Si6-nAlnOnN8-n: Eu2+(wherein 0 < n < 4.2).

[0080] The third luminescent material may be configured to convert at least part of the first light source light received by the third luminescent material into third luminescent 2024PF80377

[0081] 19

[0082] material light. Further, the third luminescent material may be configured to convert at least part of the first light source light received by the luminescent converter into third luminescent material light. In embodiments, the third luminescent material may be configured to convert > 10%, such as > 15%, especially > 25%, of (a spectral power of) the first light source light received by the luminescent converter into third luminescent material light. Additionally or alternatively, the third luminescent material may be configured to convert < 55%, such as < 50%, especially < 40%, of (a spectral power of) the first light source light received by the luminescent converter into third luminescent material light.

[0083] The third luminescent material light may have a third centroid wavelength (λc3). In embodiments, the third centroid wavelength (λc3) may be selected from the range of 500-570 nm, such as from the range of 500-560 nm, especially from the range of 520-560 nm. Further, the third centroid wavelength (λc3) may be selected from the range of 530-560, such as from the range of 535-555 nm, especially from the range of 540-555 nm. Hence, the third luminescent material light may be yellow light or green light, such as especially green light. The term “yellow light”, and similar terms, may especially relate to light having a wavelength in the range of about 560-590 nm. The third luminescent material light may especially have the third centroid wavelength (λc3) selected from the range of 530-560, such as from the range of 535-555 nm, especially from the range of 540-555 nm, when the third luminescent material may comprise Si6-nAlnOnN8-n: Eu2+(wherein 0 < n < 4.2). Hence, in specific embodiments, the third centroid wavelength (λc3) may be selected from the range of 530-560 nm, wherein the third luminescent material may comprise Si6-nAlnOnN8-n: Eu2+, wherein 0 < n < 4.2. Such a third centroid wavelength ( cs), and such a third luminescent material, may especially facilitate providing third luminescent material light having the majority of the spectral power in the green wavelength range. Further, such a third luminescent material may be relatively efficient. As indicated above, the first luminescent material may be a KSF-type luminescent material, and the second luminescent material may be a divalent europium comprising nitride luminescent material. Hence, the invention may especially provide a marbled meat module using a narrow green phosphor, KSF, and a red nitride phosphor.

[0084] The third centroid wavelength (λc3) may be smaller than the first centroid wavelength (Xci). Especially, in embodiments, Xci-λc3 > 65 nm (may apply), such as Xci-Xc3 > 75 nm, especially Xci-Xc3 > 80 nm. Additionally or alternatively, in embodiments, Xci-Xc3 < 100 nm (may apply), such as Xci-Xc3 < 90 nm, especially Xci-Xc3 < 85 nm. Further, in embodiments, the third centroid wavelength (λc3) may be smaller than the second centroid 2024PF80377

[0085] 20

[0086] wavelength (λc2). Especially, in embodiments, λC2-λC3 > 10 nm (may apply), such as λC2-λC3 > 80 nm, especially λC2-λC3 > 85 nm. Additionally or alternatively, in embodiments, λC2-λC3 < 110 nm (may apply), such as λC2-λC3 < 100 nm, especially λC2-λC3 < 95 nm.

[0087] The third luminescent material light may comprise at least one emission band having a third full width at half maximum FWHM3 of > 15 nm, such as > 20 nm, especially > 30 nm. Additionally or alternatively, the third luminescent material light may comprise the at least one emission band having a third full width at half maximum FWHM3 of < 90 nm, such as < 80 nm, especially < 70 nm, like < 60 nm. Hence, the third luminescent material light may comprise at least one emission band having a third full width at half maximum FWHM3 selected from the range of 15-90 nm, such as from the range of 20-80 nm, especially from the range of 30-70 nm. The third luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the third full width at half maximum FWHM3. Alternatively, the third luminescent material light may comprise a single emission band, wherein said emission band may have the third full width at half maximum FWHM3.

[0088] As indicated above, the light generating system may be configured to generate system light. The system light may comprise the first luminescent material light, the second luminescent material light, and the third luminescent material light. Especially, the system light may have a spectral power distribution, wherein xi% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light. In embodiments, xi may be selected from the range of > 2%, such as from the range of > 5%, especially from the range of > 7%. Additionally or alternatively, xi may be selected from the range of < 20%, such as from the range of < 15%, especially from the range of < 12%.

[0089] Hence, in embodiments, 2% < xi < 20% may apply, such as 5% < xi < 15%, especially 7% < xi < 12%. Further, the system light may have a spectral power distribution, wherein X2% of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light. In embodiments, X2 may be selected from the range of > 15%, such as from the range of > 20%, especially from the range of > 30%. Additionally or alternatively, X2 may be selected from the range of < 65%, such as from the range of < 60%, especially from the range of < 50%. Hence, in embodiments, 15% < X2 < 65% may apply, such as 20% < X2 < 60%, especially 30% < X2 < 50%. Further, the system light may have a spectral power distribution, wherein X3% of the spectral power in the wavelength range of 380-780 nm may be provided by the third luminescent material light. In embodiments, X3 may be selected from the range of > 10%, such as from the range of > 15%, especially from the range of > 25%. Additionally or alternatively, X3 may be selected from the range of < 2024PF80377

[0090] 21

[0091] 55%, such as from the range of < 50%, especially from the range of < 40%. Hence, in embodiments, 10% < X3 < 55% may apply, such as 15% < X3 < 50%, especially 25% < X3 < 40%. Further, in embodiments, X2 > X3 may apply, such as X2 - X3 > 2%, especially X2 - X3 > 5%. Additionally or alternatively, in embodiments, X2 - X3 < 20% may apply, such as X2 - X3 < 15%, especially X2 - X3 < 10%. Further, in embodiments, X3 - x1 > 10% may apply, such as X3 - x1 > 15%, especially X3 - x1 > 20%. Additionally or alternatively, in embodiments, X3 -xi < 35% may apply, such as X3 - xi < 30%, especially X3 - xi < 25%. Further, in embodiments, x1 + X2 + X3 > 65% may apply, such as x1 + X2 + X3 > 70%, especially x1 + X2 + X3 > 75%. Additionally or alternatively, in embodiments, xi + X2 + X3 < 95% may apply, such as xi + X2 + X3 < 90%, especially xi + X2 + X3 < 85%. That is, in embodiments, 65% < xi + X2 + X3 < 95% may apply, such as 70% < xi + X2 + X3 < 90%, especially 75% < xi + X2 + X3 < 85%. Hence, in specific embodiments, the system light may have a spectral power distribution, wherein: (i) x1% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light, wherein 5% < xi < 15%; (ii) X2% of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light, wherein 20% < X2 < 60%; and (iii) X3% of the spectral power in the wavelength range of 380-780 nm may be provided by the third luminescent material light, wherein 15% < X3 < 50%; and wherein 70% < xi + X2 + X3 < 90%. Such relative contributions may facilitate that the system light may have a relatively high intensity in the (orange-)red wavelength range. Hence, such system light may especially provide over saturation of red colors, such as the color of the red (lean) meat in marbled meats. In specific embodiments, 9% < xi < 11%, 38% < X2 < 40%, 31% < X3 < 33%, and 80% < xi + X2 + X3 < 82% may apply.

[0092] Hence, in embodiments, xi + X2 + X3 < 95% may apply. In such embodiments, the system light may further comprise (at least) part of the first light source light. Hence, in embodiments, the luminescent converter may be configured to transmit at least part of the first light source light received by the luminescent converter. Especially, the luminescent converter may be configured to transmit > 10%, such as > 15%, especially > 17%, of the first light source light received by the luminescent converter. Additionally or alternatively, the luminescent converter may be configured to transmit < 30%, such as < 25%, especially < 23%, of the first light source light received by the luminescent converter. That is, in embodiments, the luminescent converter may be configured to transmit 10-30%, such as 15-25%, especially 17-23%, of the first light source light received by the luminescent converter. Further, the system light may have a spectral power distribution, wherein > 10%, such as > 2024PF80377

[0093] 22

[0094] 15%, especially > 17%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. Additionally or alternatively, the system light may have a spectral power distribution, wherein < 30%, such as < 25%, especially < 23%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. That is, the system light may have a spectral power distribution, wherein 10-30%, such as 15-25%, especially 17-23%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. Hence, in specific embodiments, the system light may have a spectral power distribution, wherein 15-25% of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. System light comprising at least part of the first light source light may facilitate that the system light may have at least some spectral power in the blue wavelength range. Hence, such system light may have an improved white representation, thereby facilitating that the system light may emphasize e.g. fat marbling in marbled meats.

[0095] Hence, the system light may comprise at least part of the first light source light. Further, in embodiments, the system light may comprise a blue light component, a green light component, and a red light component. Hence, in embodiments, the system light may especially be white light. The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1500 K and 20000 K, such as between 2000 and 20000 K, especially between 2700 and 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700-6500 K. In embodiments, the correlated color temperature (CCT) may especially be within about 25 SDCM (standard deviation of color matching) from the BBL (black body locus), such as within 22 SDCM from the BBL, especially within 20 SDCM from the BBL.

[0096] In embodiments, the system light may be white light having a correlated color temperature (CCT) selected from the range of > 1500 K, such as from the range of > 2000 K, especially from the range of > 2500 K, like from the range of > 2700 K. Additionally or alternatively, the system light may be white light having a CCT selected from the range of < 4500 K, such as from the range of < 4000 K, especially from the range of < 3500 K, like from the range of < 3300 K. Hence, the system light may have a CCT selected from the range of 1500-4500 K, such as from the range of 2000-4000 K, especially from the range of 2500-3500 K, like from the range of 2700-3300 K. The system light may have a color point (below the BBL and) with a distance to the BBL of < 25 SDCM, such as < 20 SDCM, especially < 19 SDCM. Additionally or alternatively, the system light may have a color point (below the 2024PF80377

[0097] 23

[0098] BBL and) with a distance to the BBL of > 10 SDCM, such as > 15 SDCM, especially > 16 SDCM. Hence, the system light may have a color point below the BBL and with a distance to the BBL selected from the range of 10-25 SDCM, such as from the range of 15-20 SDCM, especially from the range of 16-19 SDCM. Further, the system light may have a color point in the color space represented by the CIE 1960 uniform chromaticity scale (UCS) diagram (or “CIE 1960 UCS diagram”). Especially, the system light may have a color point (in the CIE 1960 UCS diagram) (below the black body locus (BBL), and) with a distance to the BBL of Duv < -0.005, such as Duv < -0.01, especially Duv < -0.015, like Duv < -0.018. Additionally or alternatively, the system light may have a color point (in the CIE 1960 UCS diagram) with a distance to the BBL of Duv > -0.035, such as Duv > -0.03, especially Duv > -0.025, like Duv > -0.022. That is, the system light may have a color point (in the CIE 1960 UCS diagram) with a distance to the BBL of -0.035 < Duv < -0.005, such as -0.03 < Duv < -0.01, especially -0.025 < Duv < -0.015, like -0.022 < Duv < -0.018. Herein, the term “Duv” may indicate a (smallest) difference between a color point and the BBL (in the CIE 1960 UCS diagram) along one or both of the u-axis and the v-axis, wherein a negative value for Duv indicates a color point below the BBL, and a positive value for Duv indicates a color point above the BBL. Hence, in specific embodiments, the system light may have a correlated color temperature selected from the range of 2500-3500 K, wherein the system light may have a color point with a distance to the black body locus of -0.025 < Duv < -0.015. Such a CCT and Duv may facilitate that the system light may be relatively warm white light with a color point below the BBL (in the CIE 1960 UCS diagram), thereby providing a relatively good white representation and / or enhancing the red color of e.g. marbled meats.

[0099] The system light may thus comprise the (red) first luminescent material light, the (red) second luminescent material light, and the (green) third luminescent material light. As indicated above, the third centroid wavelength (λc3) may be selected from the range of 530-560 nm, such as from the range of 540-555 nm. Further, in embodiments, the system light may have a spectral power distribution, wherein the system light may have a first wavelength-averaged intensity I1ain the wavelength range of 540-555 nm. Herein, the term “wavelength-averaged intensity” may refer to an average intensity (in e.g. photons per second) in a certain wavelength range, and may be determined by Ia= Σ I(λ) / (λmax- λmin). where the summation is over the wavelength range of interest, I(λ) is the intensity, and λmaxand λminindicate the upper bound and lower bound of the wavelength range of interest, respectively. Hence, for the wavelength range of 540-555 nm, the first wavelength-averaged intensity Iiamay be determined by I1a= Σ I(λ) / (555 - 540), wherein the summation is over 2024PF80377

[0100] 24

[0101] the wavelength range of 540-555 nm. In embodiments, the system light may further have a spectral power distribution, wherein the system light may have a second wavelength-averaged intensity ha in the wavelength range of 555-590 nm. In embodiments, Iia> ha may apply, such as a > 1.05*ha, especially a > 1.1 *ha. Additionally or alternatively, in embodiments, a < 1.5*ha may apply, such as a < 1.35*ha, especially a < 1.2*ha. Hence, ha<ha< 1.5*ha may apply, such as 1.05*ha<ha< 1.35*ha, especially l.l*ha<ha< 1.2*ha. Further, the system light may have a spectral power distribution, wherein the system light may have a third wavelength-averaged intensity ha in the wavelength range of 590-620 nm. In embodiments, ha > ha may apply, such as ha > 1.15*ha, especially ha > 1.3*ha.

[0102] Additionally or alternatively, in embodiments, ha < 2*ha may apply, such as ha < 1.8*ha, especially ha < 1.6*ha. Hence, in embodiments, ha < ha < 2*ha may apply, such as 1.15*ha < ha < 1.8*ha, especially 1.3*ha < ha < 1.6*ha. Further, in embodiments, ha > ha may apply, such as ha > 1.1 * a, especially ha > 1.2*ha. Additionally or alternatively, in embodiments, ha < 1.7*ha may apply, such as ha < 1.5*Iia, especially ha < 1.3*ha. That is, in embodiments, ha < ha < 1.7*ha may apply, such as 1.1 *ha < ha < 1.5*ha, especially 1.2*ha < ha < 1.3*ha. Hence, in specific embodiments, the system light may have a spectral power distribution, wherein the system light may have: (i) a first wavelength-averaged intensity ha in the wavelength range of 540-555 nm, (ii) a second wavelength-averaged intensity ha in the wavelength range of 555-590 nm, and (iii) a third wavelength-averaged intensity ha in the wavelength range of 590-620 nm; wherein ha > ha and ha > ha. Such a system light may facilitate that a spectral power distribution of the system light may have a “dip” in the yellow wavelength range. Yellow light may facilitate red meats appearing more yellow or blue, which may result in a less desirable appearance to a consumer. Hence, system light having a “dip” in the yellow wavelength range (and a relatively higher intensity in the red wavelength range) may enhance the appearance of red meats by accentuating the red color of the meat.

[0103] Hence, as indicated above, the system light may have relatively higher (average) intensity in the wavelength range of 590-620 nm than in the wavelength range of 555-590 nm (and the wavelength range of 540-555 nm). Further, the system light may have a spectral power distribution, wherein > 30%, such as > 40%, especially > 50%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 590-780 nm. Additionally or alternatively, the system light may have a spectral power distribution, wherein < 90%, such as < 80%, especially < 70%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 590-780 nm. In embodiments, the (white) system light may have a CRI R9 score of at least 35, such as at least 40, especially at 2024PF80377

[0104] 25

[0105] least 45. Further, the (white) system light may have a CRI R9 score of at least 65, such as at least 70, especially at least 75. Additionally or alternatively, the (white) system light may have a CRI R9 score of at most 97, such as at most 95, especially at most 90, like at most 85.

[0106] The system light may further have a C9 score. The C9 score (or “chroma index C9”) may be related to a direction of an (observed) color shift when illuminating the testcolor sample #9 of CIE 13.3-1995 (CIE, 1995) with a reference illuminant (e.g. a Planckian radiator with a CCT equal to the CCT of the illuminant under test) and the illuminant under test. The C9 score may further relate to a color rendition property of the illuminant under test (here especially the light generating system). The C9 score of the system light may be determined as described in section 3.3.2.4 of the Technical Report " Overview of Methods for Evaluating Colour Rendition of White-Light Sources beyond Colour Fidelity", CIE 253:2024, ISBN: 978-3-902842-72-5, DOI: 10.25039 / TR.253.2024, which is hereby herein incorporated by reference. Especially, the chroma index Ci of the illuminant under test towards a test-color sample of CIE 13.3-1995 may be determined by the following formula:

[0107] Ci= 100 * Ck,i / Cr,i= 100 *

[0108] Ci= 100 * Ck,i / Cr,i= 100 *

[0109]

[0110] √((U*r,i)2+ (V*r,i)2)

[0111] wherein C is the chroma index of the respective test-color sample, the subscript i indicates the number of the test-color sample (for instance, for test-color sample #9 Ci would be C9), Ck,i indicates the chroma index of the test-color sample illuminated by the illuminant under test, Cr,iindicates the chroma index of the test-color sample illuminated by the reference illuminant, U*k,i and V*k,i indicate the CIE 1964 uniform space coordinates for the test-color sample of the illuminant under test, and U*r,i and V*r,i indicate the CIE 1964 uniform space coordinates for the test-color sample of the reference illuminant. In the above formula, a chroma index (or “Ci score”) of < 100 may indicate a reduced chroma compared to the reference illuminant, while a chroma index of > 100 may indicate an increased chroma compared to the reference illuminant.

[0112] Hence, as indicated above, the system light may have a C9 score. The C9 score may be related to test-color sample #9, and may represent the red chroma index due to the (strong) red color of test-color sample #9. In embodiments, the system light may have a C9 score of at least 95, such as at least 100, especially at least 101, like at least 103.

[0113] Additionally or alternatively, the system light may have a C9 score of at most 125, such as at 2024PF80377

[0114] 26

[0115] most 120, especially at most 115, like at most 110. Hence, in specific embodiments, the system light may have a spectral power distribution, wherein > 40% of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 590-780 nm; and wherein the system light may have a CRI R9 score of at most 95 and a C9 score of at least 100. Such system light may have a relatively high red color rendition. Hence, such system light may be especially suited to highlight and emphasize the red color of red meats.

[0116] Hence, as indicated above, the system light may have a C9 score selected from the range of 95-125, such as from the range of 100-120, especially from the range of 101-115, like from the range of 103-110. Further, the system light may have a C9 score selected from the range of 100-115, especially from the range of 100-110. Additionally or alternatively, the system light may have a CIO score (or “chroma index CIO”). The CIO score may be related to the test-color sample #10 of CIE 13.3-1995, and may represent the yellow chroma index due to the yellow color of test-color sample #10. In embodiments, the system light may have a CIO score of < 103, such as < 100, especially < 98. Additionally or alternatively, the system light may have a CIO score of > 75, such as > 80, especially > 85. Further yet, the system light may have a Cl 1 score (or “chroma index Cl 1”). The Cl 1 score may be related to the test-color sample #11 of CIE 13.3-1995, and may represent the green chroma index due to the green color of test-color sample #11. In embodiments, the system light may have a Cl 1 score of > 98, such as > 100, especially > 102. Additionally or alternatively, the system light may have a Cl 1 score of < 125, such as < 120, especially < 115. Hence, in specific embodiments, the system light may have a C9 score selected from the range of 100-120, a CIO score selected from the range of < 100, and a Cl 1 score selected from the range of > 100. Such chroma indices C9, CIO, and Cl 1 may facilitate that the system light may highlight red colors, and may have relatively poor yellow representation. Hence, such system light may especially facilitate enhancing red colors in meats illuminated with the system light, while optionally preventing the (white) fat marbling in the meats from appearing yellow, thereby facilitating that the meats may appear more fresh and tasty.

[0117] Hence, the light generating system may be configured to generate system light. Especially the light generating system may be configured to generate system light with a luminous efficacy of radiation of > 250 Lm / W, such as a luminous efficacy of radiation of > 255 Lm / W, especially a luminous efficacy of radiation of > 260 Lm / W. Further, the light generating system may be configured to generate system light with a luminous efficacy of radiation of > 265 Lm / W, such as a luminous efficacy of radiation of > 270 Lm / W, especially a luminous efficacy of radiation of > 275 Lm / W. Additionally or alternatively, the light 2024PF80377

[0118] 27

[0119] generating system may be configured to generate system light with a luminous efficacy of radiation of < 300 Lm / W, such as a luminous efficacy of radiation of < 295 Lm / W, especially a luminous efficacy of radiation of < 290 Lm / W. Herein, the term “luminous efficacy of radiation” may refer to the amount of lumens generated by the light generating system per Watt of light emitted by the light generating system (as system light). Hence, in specific embodiments, the light generating system may be configured to generate system light with a luminous efficacy of radiation of > 255 Lm / W. Such a light generating system may be relatively more efficient than previous light generating systems (designed) for the illumination of marbled meats. Hence, such a light generating system may reduce the energy needed for illumination of marbled meats, thereby reducing costs for users.

[0120] As indicated above, the system light may comprise the first luminescent material light, the second luminescent material light, the third luminescent material light, and at least part of the first light source light. Further, the first luminescent material light, second luminescent material light, and third luminescent material light may be based on the conversion of first light source light (into the respective luminescent material light). Hence, in embodiments, the system light may consist of light originating (before conversion) from a single solid state light source, such as especially from the first solid state light source. That is, in embodiments, the first solid state light source may provide (essentially) all of the spectral power of the system light, either directly (by transmission through the luminescent converter) or indirectly (after absorption and conversion by the first luminescent material, second luminescent material, and third luminescent material).

[0121] As indicated above, the luminescent converter may comprise the first luminescent material, the second luminescent material, and the third luminescent material. In embodiments, the luminescent materials may be configured (homogeneously mixed and) evenly dispersed throughout the luminescent converter. Alternatively, one or more of the first luminescent material, second luminescent material, and third luminescent material may be present in a gradient in the luminescent converter (wherein the gradient may especially be along a direction of an optical axis of the first light source light through the luminescent converter). Especially, one or more of the first luminescent material, second luminescent material, and third luminescent material may be present in a gradient in the luminescent converter, wherein the luminescent converter may comprise a relatively higher concentration of the one or more of the first luminescent material, second luminescent material, and third luminescent material closer to the light escape surface of the first solid state light source. 2024PF80377

[0122] 28

[0123] In alternative embodiments, the luminescent converter may comprise a layer stack. The layer stack may comprise a first luminescent layer and a second luminescent layer. In embodiments, the second luminescent layer may be configured downstream of the first luminescent layer. Further, in embodiments, the second luminescent layer may be configured in physical contact with the first luminescent layer. Alternatively, the second luminescent layer may be configured physically separated from the first luminescent layer, such as separated by a second non-zero distance d2, wherein the second non-zero distance d? may be selected from the same range as di (see above). The first luminescent layer may comprise the second luminescent material (wherein the second luminescent layer may be essentially free from the second luminescent material). Additionally, the second luminescent layer may comprise the third luminescent material (wherein the first luminescent layer may be essentially free from the third luminescent material). In embodiments, one or more of the first luminescent layer and the second luminescent layer may comprise the first luminescent material. Hence, in specific embodiments, the luminescent converter may comprise a layer stack comprising a first luminescent layer and a second luminescent layer; wherein the second luminescent layer may be configured downstream of the first luminescent layer; wherein the first luminescent layer may comprise the second luminescent material; and wherein the second luminescent layer may comprise the third luminescent material. An absorption spectrum of the second luminescent material may have some overlap with an emission spectrum of the third luminescent material. Hence, a layer stack, wherein the second luminescent material may be configured upstream of the third luminescent material, may reduce the amount of third luminescent material light absorbed by the second luminescent material, thereby increasing the efficiency of the light generating system. Further, a layer stack may adjust the spectral power distribution of the third luminescent material light emitted from the luminescent converter, as the third luminescent material light may have (a relatively higher) intensity in that part of the emission spectrum (generally at the side of the shorter wavelengths) where the second luminescent material has absorption for the third luminescent material light.

[0124] Further, the luminescent converter, such as especially the layer stack, may comprise a third luminescent layer. In such embodiments, the third luminescent layer may comprise the first luminescent material (wherein the first luminescent layer and the second luminescent layer may be essentially free from first luminescent material). The third luminescent layer may have any position in the layer stack. Hence, in embodiments, the third luminescent layer may be configured upstream of the first luminescent layer and the second 2024PF80377

[0125] 29

[0126] luminescent layer. Alternatively, the third luminescent layer may be configured downstream of the first luminescent layer and the second luminescent layer. Yet, especially, the third luminescent layer may be configured downstream of the first luminescent layer and upstream of the second luminescent layer. Hence, in specific embodiments, the layer stack may further comprise a third luminescent layer; wherein the third luminescent layer may comprise the first luminescent material; and wherein the third luminescent layer may be configured downstream of the first luminescent layer and upstream of the second luminescent layer. The first luminescent material may be relatively susceptible to photodegradation and / or oxidation (e.g. due to exposure to moisture and / or air). Hence, configuring the third luminescent layer between the first luminescent layer and the second luminescent layer may facilitate protecting the first luminescent material against high-intensity light with the first luminescent layer, and against moisture and / or oxygen with the second luminescent layer, thereby extending the lifetime of the light generating system. Further, placing the first luminescent material upstream of one or more of the second luminescent material and third luminescent material may facilitate reducing the amount of first luminescent material in the luminescent converter, as the absorption strength of KSF-type phosphors may be relatively lower than the absorption strength of the second and third luminescent materials.

[0127] As indicated above, the luminescent converter may be configured to transmit at least part of the first light source light received by the luminescent converter. Yet, in alternative embodiments, the luminescent converter may be configured to transmit < 5%, such as < 2%, especially < 1%, including (essentially) 0%, of the first light source light received by the luminescent converter. That is, in embodiments, the first luminescent material, second luminescent material, and third luminescent material may be configured to (together) convert (essentially) all of the first light source light received by the luminescent converter into respectively first luminescent material light, second luminescent material light, and third luminescent material light. Especially, in such embodiments, the luminescent converter may comprise at least 1 times, such as at least 1.2 times, especially at least 1.4 times, a (combined) amount of the first luminescent material, second luminescent material, and third luminescent material than needed to transmit at most 2% of the of the first light source light received by the luminescent converter. Additionally or alternatively, the luminescent converter may comprise at most 4 times, such as at most 3 times, especially at most 2 times, a (combined) amount of the first luminescent material, second luminescent material, and third luminescent material than needed to transmit at most 2% of the of the first light source light received by the luminescent converter. 2024PF80377

[0128] 30

[0129] Hence, in embodiments, the system light may be (essentially) free from first light source light. Especially, in such embodiments, the system light may have a spectral power distribution, wherein < 5%, such as < 2%, especially < 1%, including (essentially) 0%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. Further, in such embodiments, the light generating system may comprise a first light generating device and a second light generating device. The first light generating device may especially comprise the first solid state light source and the luminescent converter. Further, the first light generating device may be configured to generate first device light comprising the first luminescent material light, the second luminescent material light, and the third luminescent material light (wherein the first device light may be essentially free from first light source light). Additionally or alternatively, the second light generating device may comprise a second solid state light source. The second solid state light source may be selected from the group comprising an LED, a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). The second solid state light source may be configured to generate second light source light. The second light source light may have a second peak wavelength (Xp2) selected from the range of 380-500 nm, such as from the range of 400-490 nm, especially from the range of 430-480 nm, like from the range of 430-470 nm. Hence, the second light source light may be one of violet light and blue light, such as especially blue light.

[0130] The second light generating device may be configured to generate second device light. In embodiments, the second device light may comprise the second light source light. Especially, the second device light may (essentially) consist of the second light source light. In such embodiments, the second light generating device may optionally comprise a diffuser, wherein the diffuser may be configured downstream of the second solid state light source, wherein the diffuser may be configured to diffuse (at least part of) the second light source light received by the diffuser into diffused second light source light, and wherein the second device light may (essentially) consist of the diffused second light source light. Hence, the second device light may especially be (diffused) blue light. Further, in embodiments, the system light may comprise one or more of the first device light and the second device light. Especially, in an operational mode of the light generating system, the system light may comprise (both) the first device light and the second device light. Hence, in specific embodiments, (A) the light generating system may comprise a first light generating device and a second light generating device; wherein the first light generating device may comprise the first solid state light source and the luminescent converter; wherein the luminescent 2024PF80377

[0131] 31

[0132] converter may comprise at least 1.2 times an amount of the first luminescent material, second luminescent material, and third luminescent material than needed to transmit at most 2% of the of the first light source light received by the luminescent converter; wherein the first light generating device may be configured to generate first device light comprising the first luminescent material light, the second luminescent material light, and the third luminescent material light; (B) the second light generating device may comprise a second solid state light source; wherein the second solid state light source may be configured to generate second light source light having a second peak wavelength (λp₂) selected from the range of 430-480 nm; wherein the second light generating device may be configured to generate second device light comprising the second light source light; and (C) the system light may comprise one or more of the first device light and the second device light. A light generating system comprising a first light generating device and a second light generating device may facilitate that a control system functionally coupled with the first light generating device and the second light generating device may be configured to control the relative contribution of blue light to the system light, thereby facilitating adjusting the spectral properties of the system light based on user preference.

[0133] Hence, in embodiments, the system light may be (essentially) free from (blue) first light source light, wherein the system light may comprise (blue) second light source light. Further, in an operational mode of the light generating system, the system light may have at least some intensity in the blue wavelength range (provided by one or more of the first light source light and the second light source light). Especially, the system light may have a spectral power distribution, wherein > 5%, such as > 10%, especially > 15%, like > 17%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm. Additionally or alternatively, the system light may have a spectral power distribution, wherein < 35%, such as < 30%, especially < 25%, like < 23%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm. That is, the system light may have a spectral power distribution, wherein 5-35%, such as 10-30%, especially 15-25%, like 17-23%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm. Hence, in specific embodiments, the system light may have a spectral power distribution, wherein 10-30% of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm. Such a contribution of blue light in the system light may provide system light having a relatively good white representation, thereby highlighting e.g. the fat marbling in marbled meats, and / or the fat globules in meats such as salami. 2024PF80377

[0134] 32

[0135] As indicated above, the light generating system may comprise or be functionally coupled with a control system. The control system may be configured to individually control the first light generating device and the second light generating device. Further, the control system may be configured to control one or more of a spectral distribution, an intensity, a CCT, and a CRI of the system light (by individually controlling the first light generating device and the second light generating device). The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein the term “controlling” and similar terms may include imposing behavior on an element and / or monitoring the element. The controlling of the element can be done with a control system. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. The control system and element may not be physically coupled. Control can be done via wired and / or wireless control. A control system may comprise or may be functionally coupled to a user interface. The control system may also be configured to receive and execute instructions from a remote control. The control system may be controlled via an App on a device, such as a portable device. In such embodiments the control system of the lighting system may be a slave control system. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology. The control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme.

[0136] In embodiments, the light generating system may comprise a LED package. The term “LED package” may refer to a housing comprising a solid state light source (e.g. a semiconductor chip) and one or more further (optical and / or electrical) components, such as a luminescent converter, a reflector, a carrier, one or more optical elements (e.g. a lens, a dome, a diffuser, etc.), electrical connective elements (e.g. wiring), a heat sink, a Zener diode, etc.. Especially, the LED package (of the light generating system) may comprise the first solid state light source and the luminescent converter. Optionally, the LED package (of the light generating system) may further comprise one or more of a reflector, a carrier, one or more optical elements (e.g. a lens, a dome, a diffuser, etc.), electrical connective elements (e.g. wiring), a heat sink, a Zener diode, and one or more further optical and / or electrical components. In embodiments, the LED package may at least comprise a reflective cup.

[0137] Hence, in specific embodiments, the light generating system may comprises a LED package, 2024PF80377

[0138] 33

[0139] wherein the LED package may comprise the first solid state light source and the luminescent converter. A LED package may provide thermal management for the first solid state light source and / or the luminescent converter. Further, a LED package may protect the first solid state light source and / or the luminescent converter against ingress and / or damage.

[0140] The term “LED package” may in general language usage also be indicated as simply “LED”. That is, in general language usage, the term “LED” may be used to refer to a LED package. In embodiments, a LED package may comprise a solid state light source (e.g. a semiconductor chip) configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED. Such an LED (package), which may not comprise a luminescent material, may be indicated as a direct-color LED (dc-LED). Alternatively, the LED package may comprise a solid state light source configured to provide primary radiation, wherein at least part of the primary radiation may be converted into secondary radiation (e.g. by a luminescent material) within the LED package. Such an LED (package) may especially be indicated as a phosphor converted LED or pc-LED. Herein, the LED package (comprising the first solid state light source and the luminescent converter) may especially be based on the conversion of first light source light by a (first, second, and third) luminescent material. Hence, the LED package may be a pc-LED.

[0141] Hence, the light generating system may comprise (a LED package comprising) the first solid state light source and the luminescent converter. Further, the light generating system may comprise a LED package comprising the first light generating device. In embodiments, the light generating system may further comprise the second light generating device. The second light generating device may be configured as a (separate) LED package. Alternatively, the first light generating device may be configured in a (single) LED package with the second light generating device. Alternatively, the second light generating device may not be comprised by a LED package. In embodiments, a LED package may comprise multiple sub-packages, wherein each sub-package may be a LED package as described above. Hence, the light generating system may comprise a LED package comprising the first light generating device and the second light generating device. In such embodiments, as indicated above, each of the first light generating device and the second light generating device may be configured as a (separate) LED package, wherein the (separate) LED packages may together form a (larger) LED package. Hence, a LED package may comprise one or more LED (sub-)packages. Alternatively, a LED package may comprise one or more compartments, wherein each compartment may comprise a light generating device (wherein the light generating devices on their own may not be configured as a LED package). Hence, 2024PF80377

[0142] 34

[0143] the light generating system may comprise a LED package comprising the first light generating device and the second light generating device. Further, the light generating system may comprise a LED package comprising the second light generating device and a plurality of the first light generating device (wherein each of the plurality of first light generating devices may comprise a first solid state light source and a luminescent converter as defined above). Especially, the LED package may comprise > 2, such as > 3, especially > 4, first light generating devices. Additionally or alternatively, the LED package may comprise < 5, such as < 4, especially < 3, first light generating devices. In embodiments, the system light may comprise the first device light of the plurality of first light generating devices and the second device light. Hence, in specific embodiments, the LED package may comprise the second light generating device and a plurality of first light generating devices; wherein the system light may comprise the first device light of the plurality of first light generating devices and the second device light. Such a LED package may be relatively compact. Further, such a LED package may facilitate providing system light with a relatively high intensity.

[0144] In alternative embodiments, the light generating system may comprise a Chip-on-Board (CoB). The term “CoB” may especially refer to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of light emitting semiconductor light sources may be configured on the same substrate. Especially, a CoB may be a multi-LED chip configured together as a single lighting module. In embodiments, the Chip-on-Board (CoB) of the light generating system may comprise a plurality of the first solid state light source. Especially, the CoB may comprise > 2, such as > 3, especially > 4, first solid state light sources. Additionally or alternatively, the CoB may comprise < 200, such as < 150, especially < 100, first solid state light sources. Further, the CoB may comprise the luminescent converter. The luminescent converter may especially be configured on top of the plurality of first solid state light sources. That is, the luminescent converter may be configured as a coating. Hence, in specific embodiments, the light generating system may comprise a Chip-on-Board, wherein the Chip-on-Board may comprise (i) a plurality of the first solid state light source and (ii) the luminescent converter, wherein the luminescent converter may be configured on top of the plurality of first solid state light sources. A CoB may be relatively compact. Further, a CoB may facilitate that a plurality of first solid state light sources may share a luminescent converter.

[0145] (Additionally or) alternatively, the light generating system may comprise a LED filament. LED filaments as such are known, and are e.g. described in US8400051B2, 2024PF80377

[0146] 35

[0147] W02020016058, WO2019197394, etc., which are herein incorporated by reference. In general, a LED filament may comprise (i) a plurality of LEDs, arranged on (at least a first major surface of) an elongated carrier, and (ii) an elongated encapsulant covering the plurality of LEDs and at least part of the elongated carrier. The LED filament may in embodiments be defined by a filament length LF, a filament width WF, and a filament thickness TF. Further, the LED filament may have relatively high aspect ratios (LF / WF or LF / TF), such as > 10, especially > 15, such as > 20, more especially > 50. Yet, in embodiments, the aspect ratio (LF / WF and / or LF / TF) may be < 900, such as < 650, especially < 500. Hence, in embodiments, 10*WF< LF< 900*WF, and 10*TF< LF< 900*TF may apply. In embodiments, the LED filament may be straight. Alternatively, the LED filament may be curved. For instance, the filament may have a (2D or 3D) spiraling shape, (like) a helical shape, or another curved shape.

[0148] As indicated, the LED filament may comprise an elongated carrier, solid state light sources, and an encapsulant. Especially, the elongated carrier may support the solid state light sources. The elongated carrier may e.g. comprise glass, quartz, metal, or sapphire. In other embodiments, the elongated carrier may e.g. comprise a polymeric material or (flexible) metal, e.g., a film or foil. The elongated carrier may be rigid (self-supporting), but may (in polymeric embodiments) also be flexible. In embodiments, the elongated carrier may be light transmissive, translucent, or transparent for light, especially visible light.

[0149] Alternatively, in embodiments, the carrier may be light reflective, especially reflective for one or more of light source light and luminescent material light, such as reflective for at least light source light and luminescent material light. In specific embodiments, the carrier may be diffuse reflective. In embodiments, the (elongated) carrier may comprise a first major surface at a first side of the carrier and a second major surface at a second side of the carrier, opposite to the first side. In embodiments, the solid state light sources may be arranged on at least one of these surfaces. Hence, in embodiments, at least part of, such as all of, the solid state light sources may be mounted onto the first major surface. Additionally or alternatively, at least part of the solid state light sources may be mounted onto the second major surface. Hence, in embodiments, the solid state light sources may be arranged, mounted and / or mechanically coupled on / to the carrier, wherein the carrier may especially be configured to mechanically and / or electrically support the LEDs.

[0150] In embodiments, the solid state light sources may comprise one or more of LEDs, laser diodes, superluminescent diodes, and stacked multi -junction LEDs. Especially, the LED filament may comprise a plurality of LEDs. The (plurality of) solid state light 2024PF80377

[0151] 36

[0152] sources may be arranged in an array (on the elongated carrier), especially over at least part of the filament length LF. The number of solid state light sources in the array may be > 4, such as > 8, especially > 12, and may e.g. be up to 100, or yet even larger. In embodiments, the number of solid state light sources in the array may be selected from the range of 10-2000, such as from the range of 10-1500, especially from the range of 10-1000. In embodiments, the solid state light sources may be configured in a 1D (linear) array over at least part of the filament length LF. A first and a last solid state light source may, when measured along the LED filament, have a mutual distance of > 0.5*LF, such as > 0.7*LF. Further, the solid state light sources may be configured in two 1D arrays, one on the first major surface of the elongated carrier and one on the second major surface. A 2D array of solid state light sources of n*m LEDs may also be possible. In embodiments, n may be selected from the range of 1-4, such as 1-3, like 1-2, such as 1 or such as 2, and m may be selected from the range of larger than n, such as especially selected from the range of > 4 (when n < 4), like > 6, such as > 8. Hence, a 2D array of solid state light sources may have a (much) smaller number of rows (n) than the number of solid state light sources in those respective rows (m), such as n / m < 0.2, like n / m < 0.1, especially n / m < 0.05. Especially, in embodiments, the elongated carrier may be light transparent, wherein the solid state light sources may be configured on one or more of the first major surface and the second major surface. Alternatively, the elongated carrier may be light reflective, wherein the solid state light sources may be configured on both the first major surface and the second major surface.

[0153] The LED filament may comprise an encapsulant. The encapsulant may (at least partly) cover the plurality of solid state light sources. Further, the encapsulant may cover at least part of the elongated carrier, such as at least (part of) one of the first major surface and the second major surface. In general, the encapsulant may be in contact with the elongated carrier and may cover all of the solid state light sources. Hence, the encapsulant may be configured over at least part of the filament length LF (such as over > 70% of the filament length LF). The encapsulant may be a continuous coating along the filament length LF, at one or both, such as especially both, of the first major and the second major surface. Further, the encapsulant may at least partly cover the solid state light sources, such as in embodiments > 50%, such as > 75%, especially > 95%, up to 100%, of the total number of solid state light sources in the array. In embodiments, the encapsulant configured on the first major surface may be different from the encapsulant configured on the second major surface, such as differ in one or more of a thickness and a luminescent material concentration. In embodiments, the encapsulant may comprise one or more of a luminescent material and a 2024PF80377

[0154] 37

[0155] light scattering material. The one or more of the luminescent material and the light scattering material may especially be configured embedded in an encapsulant material, e.g. a (flexible) polymer material (such as a silicone). Especially, the encapsulant may comprise the luminescent converter. Further, the luminescent converter may be configured as the encapsulant. In embodiments, the (optional) light scattering material may be configured to scatter (or “diffuse”) the light source light, especially in a direction transverse to a normal of the (first and / or second) major surface. In specific embodiments, the light scattering material may comprise light scattering particles, e.g. at least one of BaSCU, A12O3 and TiCL particles.

[0156] In embodiments, the LED filament may be configured to generate filament light, which may comprise one or more of (scattered) light source light and luminescent material light. The term “LED filament light” may refer to the light emitted by the LED filament during operation of the LED filament. In embodiments, the filament light (of the LED filament of the light generating system) may comprise the system light. Especially, the filament light may (essentially) consist of the system light. Alternatively, the filament light (of the LED filament of the light generating system) may further comprise the second device light. In embodiments, the LED filament may comprise one or more sub-filaments.

[0157] Hence, the light generating system may comprise a LED filament. The LED filament may comprise a plurality of the first solid state light source arranged on an elongated carrier. Further, the LED filament may comprise an elongated encapsulant covering the plurality of first solid state light sources and at least part of the elongated carrier. In embodiments, the elongated encapsulant may comprise the luminescent converter. Hence, in specific embodiment, the light generating system may comprise a LED filament, wherein the LED filament may comprise (i) a plurality of the first solid state light source arranged on an elongated carrier, and (ii) an elongated encapsulant covering the plurality of first solid state light sources and at least part of the elongated carrier; wherein the first elongated encapsulant may comprise the luminescent converter. A LED filament may be suitable for light bulb applications, as a LED filament may better mimic a filament of an incandescent light bulb. Further, especially flexible LED filaments may be used in decorative lighting applications, to provide lighting solutions with various (adjustable) decorative shapes.

[0158] Some general embodiments relating to the light source will be provided next. These embodiments may relate to one or more of the first solid state light source and the second solid state light source. The term “light source” may in principle relate to any light source known in the art. In a specific embodiment, the light source may comprise an LED. The term “light source” may also relate to a plurality of (essentially identical or different) 2024PF80377

[0159] 38

[0160] light sources, such as 2-2000 (LED) light sources. The phrase “different light sources”, and similar phrases, may refer to a plurality of solid-state light sources selected from at least two different bins. Likewise, the phrase “identical light sources”, and similar phrases, may refer to a plurality of solid-state light sources selected from the same bin. Hence, the term LED may also refer to a plurality of LEDs. Further, the term “light source” may also refer to a so-called chip-on-board (CoB) light source. The term “light source” may also refer to a chip scale package (CSP) and / or a chip scale packaged (CSP) LED. A CSP may comprise a single solid state die (such as a LED) with provided thereon a luminescent material comprising layer. The term “light source” may also refer to a midpower package. A midpower package may comprise one or more solid state die(s). The die(s) may be covered by a luminescent material comprising layer. The die dimensions may be equal to or smaller than 2 mm, such as in the range of e.g. 0.2-2 mm. Herein, the term “light source” may also especially refer to a small solid state light source, such as having a mini size or micro size. For instance, the light sources may comprise one or more of mini LEDs and micro LEDs, such as especially micro LEDs or “microLEDs” or “pLEDs”. Herein, the term mini size or mini LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm - 1 mm. Herein, the term p size or micro LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm and smaller.

[0161] The light source may have a light escape surface. For LEDs it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapes from the light source. The light source is configured to provide a beam of light. This beam of light (thus) escapes from the light exit surface of the light source.

[0162] The term “light source” may refer to a semiconductor light-emitting device, such as an LED, a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In an embodiment, the light source comprises a LED. The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). Especially, the term “solid state light source” may refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, a superluminescent diode, or a multi -junction diode.

[0163] The light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, or downstream of a plurality of 2024PF80377

[0164] 39

[0165] solid-state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise a LED with on-chip optics. The light source may comprise pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). In embodiments, the light source may be a dc-LED. Alternatively, the light source may be a pc-LED. Hence, the term “light source” may refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more optics, like a lens, a collimator. In embodiments, the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light source. In specific embodiments, the light source may be selected from the group of laser diodes and superluminescent diodes. In other embodiments, the light source may comprise an LED or multi -junction (light emitting) diode. The light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution. The light source light may in embodiments comprise one or more bands, having band widths as known for lasers.

[0166] The term “laser light source” especially refers to a laser. Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the wavelength range of 200-2000 nm, such as from the wavelength range of 300-1500 nm. The term “laser” especially refers to a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Especially, the term “laser” may refer to a solid-state laser. In specific embodiments, the terms “laser” or “laser light source”, or similar terms, may refer to a laser diode (or diode laser). Hence, in embodiments the light source comprises a laser light source. In embodiments, the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of a semiconductor laser diodes, such as GaN, InGaN, AlGalnP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc. The term “solid state material laser”, and similar terms, may thus refer to a solid state laser like based on a crystalline or glass body dopes with ions, like transition metal ions and / or lanthanide ions, to a fiber laser, to a photonic crystal laser, to a semiconductor laser, etc.

[0167] In embodiments, the term “laser light source” may also refer to a plurality of (different or identical) laser light sources. In specific embodiments, the term “laser light source” may refer to a plurality N of (identical) laser light sources. In embodiments, N>2, such as N>5, especially N>8. In this way, a higher brightness (of the laser light) may be 2024PF80377

[0168] 40

[0169] obtained. Laser light sources may be arranged in a laser bank. The laser bank may comprise heat sinking and / or optics (e.g. a lens to collimate the laser light). Hence, in embodiments lasers in a laser bank (or “laser array bank”) may share the same optics.

[0170] The laser light source may be configured to generate laser light source light (or “laser light”). The light source light may essentially consist of the laser light source light. The light source light may also comprise laser light source light of two or more (different or identical) laser light sources. For instance, the laser light source light of two or more (different or identical) laser light sources may be coupled into a light guide, to provide a single beam of light comprising the laser light source light of the two or more (different or identical) laser light sources. The light source light may thus be collimated (laser) light source light. The laser light source light may comprise one or more bands, having band widths as known for lasers. In embodiments, the band(s) may be relatively sharp line(s), such as having full width half maximum (FWHM) in the range of <20 nm at RT, such as <10 nm. Hence, the light source light may have a spectral power distribution (intensity on an energy scale as function of the wavelength) which may comprise one or more (narrow) bands. The beams (of light source light) may be focused or collimated beams of (laser) light source light. The term “focused” may especially refer to converging to a small spot. Focusing (of the laser light source light) may be executed with one or more optics, such as especially two (focusing) lenses. Collimation may be executed with one or more (other) optics, like collimation elements, such as lenses and / or parabolic mirrors. In embodiments, the beam of (laser) light source light may be relatively highly collimated, such as in embodiments <2° (FWHM), more especially <1° (FWHM), most especially <0.5° (FWHM).

[0171] According to a further aspect, the invention may provide a display arrangement for displaying a product. The display arrangement may comprise a carrier. The carrier may be configured to (physically) support the product. That is, the product may be displayed on the carrier. The carrier may be any carrier known in the art. Especially, the carrier may be a (display) counter, an (open or partially transparent) refrigerator, a shelf unit, etc. Alternatively, the product may for instance be a meat product, wherein the carrier may be a meat hook or a (prosciutto and / or ham) stand. In embodiments, the carrier may be a cooled carrier. In such embodiments, the display arrangement may further comprise a cooling system, wherein the cooling system may be configured to cool the carrier. For instance, the carrier may comprise a carrier surface, wherein the carrier surface may be configured to support the product on a first face of the carrier surface, and wherein the cooling system may be configured to flow a cooled fluid past at least part of a second face of the carrier surface 2024PF80377

[0172] 41

[0173] (wherein the second face may be opposite the first face). Alternatively, the cooled carrier may e.g. be a refrigerator.

[0174] In embodiments, the product (supported on the carrier) may be a food product, such as a meat product, a fish and / or seafood product, a cheese, grains, a fruit, a vegetable, etc. Yet, especially, the product, such as especially the food product, may be a meat product. The meat product may for instance be selected from the group comprising poultry, pork, beef, and game (meat), though other meat products are herein not excluded. In embodiments, the meat product may especially be a marbled meat product (e.g. prosciutto, serrano ham, salami, steak, mortadella, capicola, pancetta, bacon, etc.). Hence, the invention may provide a display arrangement for displaying marbled meat. Further, the display arrangement may be applied in e.g. a butcher shop, a supermarket, a grocery store (deli), a farm shop, etc. The display arrangement may comprise the light generating system as defined above. In embodiments, the light generating system may be configured to illuminate the product, such as especially the marbled meat (displayed on the carrier). Hence, according to a further aspect, the invention provides a display arrangement for displaying marbled meat, wherein the display arrangement may comprise a carrier and the light generating system as defined above; wherein the carrier may be configured to support the marbled meat; and wherein the light generating system may be configured to illuminate the marbled meat. Such a display arrangement may facilitate displaying the marbled meat under lighting conditions adjusted to enhance and emphasize the fresh and tasty appearance of the marbled meat, thereby incentivizing e.g. a store customer to purchase the marbled meat.

[0175] The light generating system may further be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, medical lighting application systems (e.g. operation theater lighting), decorative lighting systems, or portable systems.

[0176] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc.. The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. The lamp may be a portable lamp, such as a torch. Further, the invention may provide a lighting fixture, comprising the light generating system as defined herein. Hence, according to a further aspect, the invention provides a lighting device selected from the group of a lamp, a luminaire, and a lighting fixture, comprising the light generating 2024PF80377

[0177] 42

[0178] system as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system.

[0179] Hence, in a further aspect, the invention also provides (a lighting device selected from the group of) a lighting fixture comprising the light generating system as defined herein. Hence, in yet a further aspect, the light generating system may comprise a lighting device selected from the group of a lamp, a luminaire, and a lighting fixture, wherein the lamp, luminaire, or lighting fixture may comprise one or more elements of the light generating system, such as the solid state light sources and the luminescent converter, and the light generating system may further comprise e.g. the control system configured to control the device.

[0180] The term “lighting fixture” may refer to a light emitting system like a moving head, a search light, a stage light, etc.. Generally these fixtures may have various control options for changing one or more of a direction of the light (e.g. via gimbals or rotary stages), a beam angle / width (e.g. via zoom optics), a beam pattern (e.g. via mechanical selection of a specific aperture that defines a virtual and patterned source for the further projection optics), the color point of the (system) light (e.g. via mechanical selection of a certain color filter), and of course a luminous flux, and mostly these may be remotely controllable.

[0181] According to a further aspect, the invention may provide a use of the light generating system as defined above for the illumination of marbled meat. Further, according to a further aspect, the invention may provide a use of the display arrangement as defined above for the illumination of marbled meat. Additionally, according to a further aspect, the invention may provide a use of the lighting device as defined above for the illumination of marbled meat. Hence, according to a further aspect, the invention provides a use of the light generating system as defined above, the display arrangement as defined above, or the lighting device as defined above, for the illumination of marbled meat. Such a use of the light generating system, display arrangement, or lighting device may facilitate enhancing the red color of the marbled meat, and / or accentuating the (white) fat marbling in the cured meats.

[0182] The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light. 2024PF80377

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[0184] BRIEF DESCRIPTION OF THE DRAWINGS

[0185] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:

[0186] Fig. 1 schematically depicts an embodiment of the light generating system; Figs. 2 schematically depicts an embodiment of the light generating system comprising a layer stack;

[0187] Fig. 3 schematically depicts an embodiment of the system light;

[0188] Fig. 4 schematically depicts an embodiment of the light generating system comprising a LED package;

[0189] Fig. 5 schematically depicts an embodiment of the light generating system comprising a Chip-on-Board;

[0190] Fig. 6 schematically depicts an embodiment of the display arrangement; and Fig. 7 schematically depicts an embodiment of the lighting device.

[0191] The schematic drawings are not necessarily to scale.

[0192] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0193] Fig. 1 schematically depicts an embodiment of the light generating system 1000. The light generating system 1000 may comprise a first solid state light source 10 and a luminescent converter 2000. The first solid state light source 10 may be configured to generate first light source light 11 having a first peak wavelength (Api ) selected from the range of 380-490 nm. Further, the luminescent converter 2000 may be configured in a light receiving relationship with the first solid state light source 10. Especially, the luminescent converter 2000 may comprise a first luminescent material 210, a second luminescent material 220, and a third luminescent material 230. The first luminescent material 210 may comprise (such as especially be) a luminescent material of the type M’xM2-2xAX6: MMn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Further, the first luminescent material 210 may be configured to convert at least part of the first light source light 11 received by the first luminescent material 210 into first luminescent material light 211. In embodiments, the first luminescent material light 211 may have a first centroid wavelength (λc1) selected from the range of 610-650 nm. Further, the first luminescent material light 211 may comprise at least one emission band having a first full 2024PF80377

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[0195] width at half maximum FWHMi of < 45 nm. The second luminescent material 220 may comprise (such as especially be) one or more of a divalent europium comprising nitride luminescent material, a divalent europium comprising oxynitride luminescent material and a luminescent material of the type M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6. Further, the second luminescent material 220 may be configured to convert at least part of the first light source light 11 received by the second luminescent material 220 into second luminescent material light 221. In embodiments, the second luminescent material light 221 may have a second centroid wavelength (λC2) selected from the range of 610-650 nm. Further, the second luminescent material light 221 may comprise at least one emission band having a second full width at half maximum FWHM2 of > 45 nm. The third luminescent material 230 may be configured to convert at least part of the first light source light 11 received by the third luminescent material 230 into third luminescent material light 231. The third luminescent material light 231 may have a third centroid wavelength (λC3) selected from the range of 500-560 nm. Further, the third luminescent material light 231 may comprise at least one emission band having a third full width at half maximum FWHM3 selected from the range of 20-80 nm. The light generating system 1000 may be configured to generate system light 1001. Especially, the system light 1001 may comprise the first luminescent material light 211, the second luminescent material light 221, and the third luminescent material light 231. Further, the system light 1001 may be white light having a correlated color temperature of 2000-4000 K and a color point with a distance to the black body locus of Duv < -0.01.

[0196] The first solid state light source 10 and the luminescent converter 2000 may be configured in thermal contact with a thermally conductive substrate 3000. Further, the thermally conductive substrate 3000 may comprise a reflective coating 3100. Especially, the thermally conductive substrate 3000 may be configured as a reflective cup. Further, in embodiments, the first solid state light source 10 may be selected from the group of a light emitting diode, a laser diode, a superluminescent diode, and a stacked multi -junction diode.

[0197] The third luminescent material 230 may comprise (such as especially be) one or more of a divalent europium comprising thiogallate, a divalent europium comprising thioaluminate, a divalent europium comprising silicate, and a luminescent material of the type Si₆₋ₙAlₙOₙN₈₋ₙ:Eu2+, wherein 0 ≤ n ≤ 4.2. Especially, the third centroid wavelength (AC3) may be selected from the range of 530-560 nm, wherein the third luminescent material 230 may comprise Si6-nAlnOnN8-n: Eu2+, wherein 0 < n < 4.2. Further, the second luminescent 2024PF80377

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[0199] material 220 may comprise one or more of M2Si5N8:Eu2+, MAlSiN3:Eu2+, and M₁₋ₓLi₃₋₂y(Al₁₋bGab)₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z:Eux, wherein M comprises one or more of Ba, Sr and Ca, and wherein 0 < x < 0.04, wherein 0 < y < 1, wherein 0 < z < 0.05, wherein 0 < b < 0.6, and wherein y + z < 1. Additionally or alternatively, the first luminescent material 210 may comprise (KyNai-y)2(SixTii-x)F6: MMn4+, wherein 0 < y < 1 and 0 < x < 1.

[0200] Fig. 2A schematically depicts a further embodiment of the light generating system 1000. The luminescent converter 2000 may comprise a layer stack 400 comprising a first luminescent layer 2100 and a second luminescent layer 2200. Especially, the second luminescent layer 2200 may be configured downstream of the first luminescent layer 2100. Further, the first luminescent layer 2100 may comprise the second luminescent material 220. Additionally or alternatively, the second luminescent layer 2200 may comprise the third luminescent material 230. Further, one or more of the first luminescent layer 2100 and the second luminescent layer 2200 may comprise the first luminescent material 210. In the embodiment depicted in Fig. 2 A, both the first luminescent layer 2100 and the second luminescent layer 2200 comprise the first luminescent material 210.

[0201] Fig. 2B schematically depicts a further embodiment of the light generating system 1000. Here, the layer stack 400 may further comprise a third luminescent layer 2300. The third luminescent layer 2300 may comprise the first luminescent material 210. Further, the third luminescent layer 2300 may be configured downstream of the first luminescent layer 2100 and upstream of the second luminescent layer 2200.

[0202] Fig. 3 schematically depicts an embodiment of the system light 1001. The system light may have a spectral power distribution, wherein 15-25% of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light.

[0203] Especially, the system light 1001 may have a spectral power distribution, wherein 10-30% of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm, such as in the wavelength range of 440-490 nm. Further, the system light 1001 may have a spectral power distribution, wherein xi% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light 211. In embodiments, 5% < xi < 15% may apply. Further, the system light 1001 may have a spectral power distribution, wherein X2% of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light 222. In embodiments, 20% < X2 < 60% may apply. Additionally or alternatively, the system light 1001 may have a spectral power distribution, wherein X3% of the spectral power in the wavelength range of 380-780 2024PF80377

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[0205] nm may be provided by the third luminescent material light 231. In embodiments, 15% < X3 < 50% may apply. Further, in embodiments, 70% < xi + X2 + X3 < 90% may apply.

[0206] The system may further have a spectral power distribution, wherein the system light 1001 may have: (i) a first wavelength-averaged intensity Iiain the wavelength range of 540-555 nm, (ii) a second wavelength-averaged intensity ha in the wavelength range of 555-590 nm, and (iii) a third wavelength-averaged intensity ha in the wavelength range of 590-620 nm. In embodiments, (ha > ha,) ha > ha and a > ha may apply. Especially, the system light 1001 may have a spectral power distribution, wherein > 40% of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 590-780 nm.

[0207] Further, the system light 1001 may have a CRI R9 score of at most 95 and a C9 score of at least 100. Especially, the system light 1001 may have a C9 score selected from the range of 100-120, a CIO score selected from the range of < 100, and a Cl 1 score selected from the range of > 100. Additionally or alternatively, the system light 1001 may have a correlated color temperature selected from the range of 2500-3500 K. Further, the system light 1001 may have a color point with a distance to the black body locus of -0.025 < Duv < -0.015.

[0208] Fig. 3 further schematically depicts an embodiment of a spectral power distribution of a first reference light generating system providing first reference system light 501 used in backlighting. As can be seen from Fig. 3, such first reference system light 501 may have a relatively larger contribution of blue light in the spectrum, and a relatively lower intensity in the red wavelength range compared to the system light 1001 of the present invention. Especially, such a first reference light generating system may be (essentially) free from a second luminescent material 220 as defined above. Further, Fig. 3 schematically depicts an embodiment of a spectral power distribution of a second reference light generating system providing second reference system light 601 used for the illumination of marbled meats. As can be seen from Fig. 3, such second reference system light 601 may be (essentially) free from a first luminescent material 210 as defined above. Hence, such a second reference light generating system may be less efficient than the light generating system 1000 of the present invention. Further, Fig. 3 schematically depicts an embodiment of a spectral power distribution of a third reference light generating system providing third reference system light 701 used in general lighting. Such third reference system light 701 may have a color point relatively closer to (e.g. within 10 SDCM of) the BBL compared to the system light 1001. Further, as can be seen from Fig. 3, such third reference system light 701 may have a relatively higher intensity in the yellow wavelength range, and a relatively lower intensity in the red wavelength range compared to the system light 1001 of the present 2024PF80377

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[0210] invention. Hence, such third reference system light 701 may, upon illumination of marbled meats with the third reference system light 701, provide a yellowish appearance to the marbled meat, and may underrepresent the red color of the marbled meat.

[0211] Fig. 4 schematically depicts a further embodiment of the light generating system 1000. The light generating system may comprise a first light generating device 110 and a second light generating device 120. The first light generating device 110 may comprise the first solid state light source 10 and the luminescent converter 2000. Further, the luminescent converter 2000 may comprise at least 1.2 times a (combined) amount of the first luminescent material 210, second luminescent material 220, and third luminescent material 230 than needed to transmit at most 2% of the of the first light source light 11 received by the luminescent converter 2000. Especially, the first light generating device 110 may be configured to generate first device light 111 comprising the first luminescent material light 211, the second luminescent material light 221, and the third luminescent material light 231. The second light generating device 120 may comprise a second solid state light source 20. The second solid state light source 20 may be selected from the group of a light emitting diode, a laser diode, a superluminescent diode, and a stacked multi -junction diode. Further, the second solid state light source 20 may be configured to generate second light source light 21 having a second peak wavelength (λp₂) selected from the range of 430-480 nm. Further, the second light generating device 120 may be configured to generate second device light 121 comprising the second light source light 21. In embodiments, the system light 1001 may comprise one or more of the first device light 111 and the second device light 121.

[0212] Further, Fig. 4 schematically depicts an embodiment of the light generating system comprising a LED package 500. Hence, the light generating system 1000 may comprise a LED package 500. The LED package 500 may especially comprise the first solid state light source 10 and the luminescent converter 2000. Additionally or alternatively, the LED package 500 may comprise the second light generating device 120 and a plurality of the first light generating device 110 as defined above. In such embodiments, the system light 1001 may comprise the first device light 111 of the plurality of first light generating devices 110 and the second device light 121. Further, the light generating system 1000 may comprise a control system 300, configured to individually control the plurality of first light generating devices 110 and the second light generating device 120.

[0213] Fig. 5 schematically depicts an embodiment of the light generating system 1000 comprising a Chip-on-Board 800. Hence, the light generating system 1000 may comprise a Chip-on-Board 800. The Chip-on-Board 800 may especially comprise a plurality 2024PF80377

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[0215] of the first solid state light source 10 (mounted on a substrate 5, e.g. a PCB). Further, the Chip-on-Board 800 may comprise the luminescent converter 2000, wherein the luminescent converter 2000 may be configured on top of the plurality of first solid state light sources 10.

[0216] Fig. 6 schematically depicts an embodiment of the display arrangement 4000. Hence, the invention may provide a display arrangement 4000 for displaying a product, such as especially marbled meat 4500. The display arrangement 4000 may comprise a carrier 4100 and the light generating system 1000 as defined above. The carrier 4100 may be configured to (physically) support the marbled meat 4500. Further, the light generating system 1000 may be configured to illuminate the marbled meat 4500. In the embodiment depicted in Fig. 6, the carrier 4100 may be a counter, such as e.g. a counter in a supermarket, yet other options are also possible (see e.g. above).

[0217] Fig. 6 further depicts an embodiment of the use of the light generating system 1000 for the illumination of marbled meat 4500. Additionally, Fig. 6 depicts an embodiment of the use of the display arrangement 4000 for the illumination of marbled meat 4500.

[0218] Further yet, Fig. 6 depicts an embodiment of the use of the lighting device 1200 for the illumination of marbled meat 4500.

[0219] Fig. 7 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 of the light generating system 1000. Fig. 7 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Hence, Fig. 7 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, and a lighting fixture, comprising the light generating system 1000 as described herein. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of (such as be) system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor and reference 1310 to a ceiling; reference 1307 refers to a wall.

[0220] The term “plurality” refers to two or more. The terms “substantially” or “essentially”, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein 2024PF80377

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[0222] the term “comprises” means “consists of’. The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term “comprising” may in an embodiment refer to “consisting of’ but may in another embodiment also refer to “containing at least the defined species and optionally one or more other species”. Use of the verb “to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0223] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0224] The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0225] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system. The 2024PF80377

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[0227] invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings.

[0228] The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

2024PF8037751CLAIMS:

1. A light generating system (1000) comprising a first solid state light source (10) and a luminescent converter (2000), wherein:the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 380-490 nm;the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210), a second luminescent material (220), and a third luminescent material (230);the first luminescent material (210) comprises a luminescent material of the type M’xM2-2xAX6: MMn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211);the second luminescent material (220) comprises one or more of a divalent europium comprising nitride luminescent material, a divalent europium comprising oxynitride luminescent material, and a luminescent material of the type M₁₋ₓLi₃₋₂y(Al₁₋bGab)₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6; wherein the second luminescent material (220) is configured to convert at least part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221);the third luminescent material (230) is configured to convert at least part of the first light source light (11) received by the third luminescent material (230) into third luminescent material light (231); wherein the third luminescent material light (231) has a third centroid wavelength (λc₃) selected from the range of 500-560 nm; wherein the third luminescent material light (231) comprises at least one emission band having a third full width at half maximum FWHM3 selected from the range of 20-80 nm;2024PF8037752the light generating system (1000) is configured to generate system light (1001), wherein the system light (1001) comprises the first luminescent material light (211), the second luminescent material light (221), and the third luminescent material light (231); wherein the system light (1001) is white light having a correlated color temperature of 2000-4000 K and a color point with a distance to the black body locus of Duv < -0.01, wherein the color point is defined according to the CIE 1960 UCS diagram; andthe system light (1001) has a spectral power distribution, wherein: (i) x1% of the spectral power in the wavelength range of 380-780 nm is provided by the first luminescent material light (211), wherein 2% < xi < 15%; (ii) X2% of the spectral power in the wavelength range of 380-780 nm is provided by the second luminescent material light (221), wherein 20% < X2 < 60%; and (iii) X3% of the spectral power in the wavelength range of 380-780 nm is provided by the third luminescent material light (231), wherein 15% < X3 < 50%; and wherein 70% < xi + X2 + X3 < 90%.

2. The light generating system (1000) according to claim 1, wherein the third luminescent material (230) comprises one or more of a divalent europium comprising thiogallate, a divalent europium comprising thioaluminate, a divalent europium comprising silicate, and a luminescent material of the type Si₆₋ₙAlₙOₙN₈₋ₙ:Eu2+, wherein 0 ≤ n ≤ 4.2.

3. The light generating system (1000) according to any one of the preceding claims, wherein the second luminescent material (220) comprises one or more of M₂Si₅N₈:Eu2+, MAlSiN3: Eu2+, and M1-xLi3-2y(Al1-bGab)1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Ba, Sr and Ca, wherein 0 < x < 0.04, wherein 0 < y < 1, wherein 0 < z < 0.05, wherein 0 < b < 0.6, and wherein y + z < 1.

4. The light generating system (1000) according to any one of the preceding claims, wherein the first luminescent material (210) comprises (KyNai-y)2(SixTii-x)F6: MMn4+, wherein 0 < y < 1 and 0 < x < 1.

5. The light generating system (1000) according to any one of the preceding claims, wherein the system light (1001) has a spectral power distribution, wherein: (i) x1% of the spectral power in the wavelength range of 380-780 nm is provided by the first luminescent material light (211), wherein 5% < xi < 15%; (ii) X2% of the spectral power in the wavelength range of 380-780 nm is provided by the second luminescent material light2024PF8037753(221), wherein 30% ≤ x₂ ≤ 60%; and (iii) x₃% of the spectral power in the wavelength range of 380-780 nm is provided by the third luminescent material light (231), wherein 25% ≤ x₃ ≤ 50%; and wherein 70% ≤ x₁ + x₂ + x₃ ≤ 90%.

6. The light generating system (1000) according to any one of the preceding claims, wherein the system light (1001) has a spectral power distribution, wherein > 40% of the spectral power in the wavelength range of 380-780 nm is in the wavelength range of 590-780 nm; wherein the system light (1001) has a CRI R9 score of at most 95 and a chroma index C9 score of at least 100, wherein the chroma index C9 score is determined according to the CIE 253:2024 Technical Report; and wherein the first solid state light source (10) is selected from the group of a light emitting diode, a laser diode, a superluminescent diode, and a stacked multi -junction diode.

7. The light generating system (1000) according to any one of the preceding claims, wherein the system light (1001) has a spectral power distribution, wherein the system light (1001) has: (i) a first wavelength-averaged intensity I₁ₐ in the wavelength range of 540-555 nm, (ii) a second wavelength-averaged intensity I₂ₐ in the wavelength range of 555-590 nm, and (iii) a third wavelength-averaged intensity I₃ₐ in the wavelength range of 590-620 nm; wherein I₁ₐ > I₂ₐ and I₃ₐ > I₂ₐ.

8. The light generating system (1000) according to any one of the preceding claims, wherein the system light (1001) has a correlated color temperature selected from the range of 2500-3500 K, wherein the system light (1001) has a color point with a distance to the black body locus of -0.025 < Duv < -0.015.

9. The light generating system (1000) according to any one of the preceding claims, wherein the luminescent converter (2000) comprises a layer stack (400) comprising a first luminescent layer (2100) and a second luminescent layer (2200); wherein the second luminescent layer (2200) is configured downstream of the first luminescent layer (2100); wherein the first luminescent layer (2100) comprises the second luminescent material (220); and wherein the second luminescent layer (2200) comprises the third luminescent material (230).2024PF803775410. The light generating system (1000) according to any one of the preceding claims, wherein the system light (1001) has a spectral power distribution, wherein 15-25% of the spectral power in the wavelength range of 380-780 nm is provided by the first light source light (11).

11. The light generating system (1000) according to any one of the preceding claims, wherein one or more applies of: (i) the third centroid wavelength (λc3) is selected from the range of 530-560 nm, wherein the third luminescent material (230) comprises SienAlnOnN8-n: Eu2+, wherein 0 < n < 4.2; and (ii) the system light (1001) has a chroma index C9score selected from the range of 100-120, a chroma index CIO score selected from the range of < 100, and a chroma index Cl 1 score selected from the range of > 100; wherein the chroma index C9, the chroma index CIO and the chroma index Cl 1 are determined according to the CIE 253:2024 Technical Report.

12. The light generating system (1000) according to any one of the preceding claims, wherein one or more applies of: (a) the light generating system (1000) comprises a LED package (500), wherein the LED package (500) comprises the first solid state light source (10) and the luminescent converter (2000); and (b) the light generating system (1000) comprises a Chip-on-Board (800), wherein the Chip-on-Board (800) comprises (i) a plurality of the first solid state light source (10) and (ii) the luminescent converter (2000), wherein the luminescent converter (2000) is configured on top of the plurality of first solid state light sources (10).

13. A display arrangement (4000) for displaying marbled meat (4500), wherein the display arrangement (4000) comprises a carrier (4100) and the light generating system (1000) according to any one of the preceding claims 1-12; wherein the carrier (4100) is configured to support the marbled meat (4500); and wherein the light generating system (1000) is configured to illuminate the marbled meat (4500).

14. A lighting device (1200) selected from the group of a lamp (1), a luminaire (2), and a lighting fixture, comprising the light generating system (1000) according to any one of the preceding claims.2024PF803775515. Use of the light generating system (1000) according to any one of the preceding claims 1-12, the display arrangement (4000) according to claim 13, or the lighting device (1200) according to claim 14, for the illumination of marbled meat (4500).

Images