A light generating system providing reliable red light

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110), wherein the first light generating device (110) comprises 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 emission wavelength (λp1) selected from the range of 490-500 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); wherein the first luminescent material (210) is 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 is in the range of 0-1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine; (C) 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); wherein the first luminescent material light (211) has a first centroid wavelength (λc1) selected from the range of 610-650 nm; wherein the first luminescent material light (211) comprises at least one emission band having a first full width at half maximum FWHM1 of ≤ 40 nm; and (D) the first light generating device (110) is configured to generate first device light (111) comprising the first luminescent material light (211); wherein the first device light (111) has a spectral power distribution, wherein ≤ 2% of the spectral power in the wavelength range of 380-780 nm is provided by the first light source light (11).

Description

[0001]2024PF80211 1 A light generating system providing reliable red light FIELD OF THE INVENTION The invention relates to a light generating system. The invention further relates to a lighting device comprising such light generating system. BACKGROUND OF THE INVENTION Light generating systems are known in the art. For instance, US20220389313A1 describes a white light emitting device comprising: an LED that generates excitation light of wavelength from 420 nm to 480 nm; and photoluminescencematerials that generate light with a peak emission wavelength from 500 nm to 650 nmcomprising a broadband phosphor, and a manganese-activated narrowband red fluoride phosphor with a peak emission wavelength from 628 nm to 640 nm and a full width at half maximum of less than 30 nm. The device generates white light with a selected colortemperature from 2200K to 6500K, a General Color Rendering Index, CRI Ra, of at least 80,and a Duv (Delta u, v) from 0.0060 to 0.0170 for the selected color temperature and wherein the device has an LER (Luminous Efficacy of Radiation) of at least 320 lm / Wopt. SUMMARY OF THE INVENTION 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 blue-emitting light source and a luminescent converter, wherein the luminescent converter may comprise multiple types of phosphors, such as a yellow and a red phosphor, to produce especially white light with a suitable colortemperature. Further, LED-based system may be used to produce colored light, such as fore.g. mood lighting. Colored light may be produced directly using a suitable LED material (direct-color LEDs or dc-LEDs), or may be based on the conversion of (especially) blue LED light by a luminescent converter (phosphor-converted LEDs or pc-LEDs). Pc-LEDs may in embodiments be more energy efficient than dc-LEDs, especially for the production of redlight. To produce red light with a pc-LED, a luminescent converter comprising e.g. a highconcentration of phosphor or a light filter may be used. However, prior art solutions may 2024PF80211 2 have problems to provide a reliable red color (over time or between different pc-LEDs), as phosphors may be unevenly distributed, or may degrade over time, allowing more or lessblue light to be admixed with the luminescent material light. Upon admixing of more bluelight into the red luminescent material light, the combined light may be perceived as purplish(-red) by a consumer. Hence, a color discrepancy may occur over time or between pc-LEDs, requiring pc-LEDs to be discarded during production or well before their expected lifespan has passed. This is undesired from an economic and durability standpoint. Hence, itis an aspect of the invention to provide an alternative light generating system, whichpreferably 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. According to a first aspect, the invention provides a light generating system comprising a first light generating device. The first light generating device may comprise a first solid state light source and a luminescent converter. Especially, the first solid state light source may be configured to generate first light source light having a first peak emission wavelength (λp1) selected from the range of 490-500 nm. Further, the luminescent converter may be configured in a light receiving relationship with the first solid state light source. The luminescent converter may comprise a first luminescent material. Especially, the first luminescent material may comprise, such as be, a luminescent material of the type M’xM2- 2xAX6 doped with tetravalent manganese, wherein M’ may comprise an alkaline earth cation, M may comprise an alkaline cation, and x may be in the range of 0-1, wherein A may comprise a tetravalent cation, and wherein X may comprise a monovalent anion, at least comprising fluorine. 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. Especially, the first luminescent material light may have a first centroid wavelength (λc1) selected 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 FWHM1of ≤ 50 nm, such as ≤ 40 nm, like ≤ 30 nm. The first light generating device may be configured to generate first device light comprising the first luminescent material light. The first device light may have a spectral power distribution, wherein ≤ 2% of the spectral power in the wavelength range of 380-780 nm may be provided by the first lightsource light. Hence, in specific embodiments, the invention provides a light generatingsystem comprising a first light generating device, wherein the first light generating device comprises a first solid state light source and a luminescent converter, wherein: (A) the first 2024PF80211 3 solid state light source is configured to generate first light source light having a first peak emission wavelength (λp1) selected from the range of 490-500 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; wherein the first luminescent material is a luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine; (C) 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; wherein the first luminescent material light has a first centroid wavelength (λc1) selected from the range of 610-650 nm; wherein the first luminescent material light comprises at least one emission band having a first full width at half maximum FWHM1 of ≤ 50 nm; and (D) the first light generating device is configured to generate first device light comprising the first luminescent material light; wherein the first device light has a spectral power distribution, wherein ≤ 2% of the spectral power in the wavelength range of 380-780 nm is provided by the first light source light. Such a light generating system may provide red first device light. Especially, such a light generating system may facilitate that, even upon admixing part of the first light source light into the first device light, the first device light may (essentially still) be perceived as red light by a consumer. Further, such a light generating system may facilitate providing (red) first device light with a relatively high energy-efficiency. In embodiments, the light generating system may comprise a first solid state light source. The first solid state light source may especially 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). 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 emission wavelength (λp1) selected from the range of 485-505 nm, such as from the range of 490-500 nm, especially from the range of 492-498 nm, such as about 495 nm. Further, the first light source light may have a spectral power distribution, wherein ≥ 80%, such as ≥ 90%, especially ≥ 95%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 485-505 nm, such as especially in the wavelength range of 490-500 nm. Hence, the first light source light may especially be green light. The terms “green light” or 2024PF80211 4 “green emission”, and similar terms, may especially relate to light having a wavelength in the range of about 490-560 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 emission 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. 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 and covering (a light escape surface of) the first solid state light source. That is, the luminescent converter may be configured as a coating. Hence, in specific embodiments, the luminescent converter may be configured as a coating, wherein the luminescent converter may be configured covering and in physical contact with the first solid state light source. Configuring the luminescent converter as a coating may improve the efficiency with which the first light source light is coupled into the luminescent converter, as the first light source light may (essentially) not berefracted at a first interface between the first solid state light source and air, and at a secondinterface between air and the luminescent converter. 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 d1from (the light escape surface of) the first solid state light source. The non-zero distance d1may be selected from the range of ≥ 5 µm, such as from the range of ≥ 10 µm, especially from the range of ≥ 25 µm. Additionally or alternatively, the non-zero distance d1 may be selected from the range of ≤ 10 cm, such as from the range of ≤ 5 cm, especially from the range of ≤ 1 cm. The luminescent converter may be physically separated from the first solid state light source. 2024PF80211 5 In embodiments, the luminescent converter may have a first major face and a second major face, wherein the second major face may be configured opposite the first major face. In embodiments, the first light source light may be incident on the first major face of the luminescent converter, and the first luminescent material light (and optionally transmitted first light source light) may exit the luminescent converter via the second major face. Hence, in specific embodiments, the luminescent converter may be configured in a transmissive mode. Herein, the term “transmissive mode” may indicate that when at least part of the (first) light source light is propagating in the same direction from the luminescent converter as it was propagating to the luminescent converter directly upstream of the luminescent converter, it may have a direction overlapping with the direction in which the (first) luminescent material light escapes from the light generating system. Configuring the luminescent converter in the transmissive mode may facilitate providing the luminescent converter as a coating on the first solid state light source. Further, configuring the luminescent converter in the transmissive mode may simplify the construction of the light generating system, as no optical elements such as reflectors and / or (dichroic) beam splitters are required to guide the luminescent material light to a light exit of the light generating system. Yet, in alternative embodiments, the luminescent converter may be configured in a reflective mode. Herein, the term “reflective mode” may indicate that when (first) light source light is reflected at the luminescent converter, it may have a direction overlapping with the direction in which the luminescent material light escapes from the system. Hence, in the reflective mode, the first light source light may be incident on the first major face of the luminescent converter, and the first luminescent material light (and reflected first light sourcelight) may exit the luminescent converter via the first major face. Configuring theluminescent converter in the reflective mode may improve thermal management, as the absorption and conversion of light may be spread over a larger optical path length within the luminescent converter. Further, as the path length of the first light source light in the luminescent converter may be doubled in the reflective mode, the reflective mode may facilitate reducing one or more of the concentration of luminescent materials in and the thickness of the luminescent converter. In the reflective mode, the second major face of the luminescent converter may comprise a reflective coating. Alternatively, in the reflective mode, the luminescent converter may be configured in physical contact with a reflective mirror at the second major face. The luminescent converter may comprise one or more luminescent materials, such as especially at least a first luminescent material. The term “luminescent material” may 2024PF80211 6 especially refer to a material that can convert first radiation, especially one or more of UV 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 “violet light”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. Further, the term “blue light”, and similar terms, may especially relate to light having a wavelength in the range of about 440-490 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. “down-conversion”). 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. For instance, in embodiments 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 (λex<λem). 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 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. 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 2024PF80211 7 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. 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 A3B5O12garnets, 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 (Y1-xLux)3B5O12: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. In specific embodiments, the luminescent material may comprise (Yx1A’x2Cex3)3(Aly1B’y2)5O12. 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 x1+x2+x3=1, wherein x3>0, wherein 0<x2+x3≤0.2, wherein y1+y2=1, 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. 2024PF80211 8 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 M2Si5N8:Eu2+and / or MAlSiN3:Eu2+and / or Ca2AlSi3O2N5: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)2Si5N8: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 CaAlSiN3:Eu, the correct formula could be (Ca0.98Eu0.02)AlSiN3. 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 optionallybe embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc..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:Eux may especially refer to (Mg,Ca,Sr,Ba)1−xLi3−2yAl1+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:Eux may 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 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 M1−xLi3−2yAl1+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 M1−xLi3−2yAl1+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, 2024PF80211 9 especially from the range of 0 ≤ z ≤ 0.05. Hence, in embodiments, in an SLA phosphor, SiN may replace AlO 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. Further, the luminescent material may comprise a SiAlON phosphor, such as selected from the group comprising (a) Si12–m–nAlm+nOnN16–n:Eu2+(α-SiAlON), (b) Si6–nAlnOnN8–n:Eu2+, wherein 0 ≤ n ≤ 4.2 (β-SiAlON), and (c) Si2–nAlnO1+nN2–n:Eu2+, wherein 0 ≤ n ≤ 0.2 (O-SiAlON). 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 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 2024PF80211 10 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, KRb0.5Sr0.25AX6 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. The term “tetravalent manganese” refers to Mn4+. 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’xM2-2xAX6doped with tetravalent manganese may also be indicated as M’xM2-2xA1-mMnmX6(or M’xM2-2xAX6:Eu). The mole percentage of manganese, i.e. the percentage it replaces the tetravalent 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 (Mn4+). 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), stannum (Sn) and zinc (Zn). 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 (K1-r-l-n-c-nh RbrLilNanCsc(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 l+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’xM2-2xAX6can also be described as MgmgCacaSrsrBaba(KkRbrLilNanCsc(NH4)nh)2AX6, with k, r, l, 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=1. In embodiments, k=1, and the others (mg, ca, sr, ba, r, l, n, c, nh) are zero. 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, 2024PF80211 11 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-nh RbrLilNanCsc(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. 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’xM2-2xAX6may refer to one or more of (K,Rb)2SiF6:Mn4+, (K,Rb)2TiF6:Mn4+, K2(Si,Ti)F6:Mn4+, and Rb2(Si,Ti)F6:Mn4+, such as one or more of K2TiF6:Mn4+, of K2SiF6:Mn4+, and of Rb2SiF6:Mn4+. 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)2SiF6:Mn4+and K2(Si,Ti)F6:Mn4+. The luminescent material may also be coated, as also described in WO2013121355A1. 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 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 or when M refers to 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’xM2-2xAX6, this may refer to e.g. one or more of K2SiF6:Mn4+and Rb2SiF6:Mn4+, or (KxRby)2SiF6:Mn4+, 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 may comprise one or more of Y, La, Gd, Tb and Lu, this may imply Y3B5O12:Ce, La3B5O12:Ce, GdB5O12:Ce, Tb3B5O12:Ce, Lu3B5O12:Ce, 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)2SiF6:Mn4+, may e.g. refer to K2SiF6:Mn4+and of Rb2SiF6:Mn4+, or (KxRby)2SiF6:Mn4+. Also herein in general x+y=1. 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. 2024PF80211 12 In embodiments, the first luminescent converter may (at least) comprise a first luminescent material. The first luminescent material may comprise any (combination) of the luminescent materials indicated above. The first luminescent material may comprise a quantum structure, such as a quantum dot, or such as a quantum rod. Quantum structures may for instance comprise (such as be based on) one or more of cadmium (Cd), indium (In), zinc (Zn), silver (Ag), and lead (Pb). Further, the first 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, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine. The first luminescent material may thus comprise a luminescent material of the type M’xM2-2xA(F,Cl,Br,I)6doped with tetravalent manganese, wherein x may especially be in the range of 0-1. As can be derived from the above, the indication “(F,Cl,Br,I)” may refer to one or more of F, Cl, Br, and I, but may especially refer to at least F, and optionally one or more of Cl, Br, and I (see also above, wherein it is indicated that cl+b+i < 1). In specific embodiments, the first luminescent material may be 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 is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine. In embodiments, the first luminescent material may comprise, such as be, a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein A may (at least) comprise one or more of silicon (Si), titanium (Ti), and germanium (Ge). In embodiments, A may (at least) comprise Si. Additionally or alternatively, A may (at least) comprise Ge. Further, additionally or alternatively, A may (at least) comprise Ti. Hence, in specific embodiments, the first luminescent material may be a luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese, wherein A may comprise one or more of titanium and germanium. A luminescent material of the type M’xM2-2xAX6:Mn4+comprising one or more of Ti and Ge may have a relatively red-shifted absorption spectrum compared to a luminescent material of the type M’xM2-2xAX6:Mn4+not comprising Ti and / or Ge. Hence, such a luminescent material may have improved absorption at the first peak emission wavelength (λp1). In embodiments, M in the formula M’xM2-2xAX6:Mn4+may comprise one or more of Na, K, Rb, NH4+, Li, and Cs. Especially, M may comprise one or more of K and Rb. Further, as indicated above, A may comprise one or more of Si, Ge, and Ti. Hence, in embodiments, the first luminescent material may comprise (K,Rb)2(Si,Ge,Ti)F6:Mn4+. The 2024PF80211 13 first luminescent material may comprise (KaRbb)2(SixTiyGez)F6:Mn4+, wherein a + b = 1, wherein a ≥ 0 and b ≥ 0, wherein x + y + z = 1, and wherein x ≥ 0, y ≥ 0, and z ≥ 0. Especially, in such embodiments, y + z ≥ 0.4, such as y + z ≥ 0.6, especially y + z ≥ 0.8, including (essentially) y + z = 1. Further, in such embodiments, a may be (essentially) 1, and b may be (essentially) 0. Hence, in embodiments, the first luminescent material may comprise, such as be, K2(SixTiyGez)F6:Mn4+, wherein x ≥ 0, y ≥ 0, z ≥ 0, x + y + z = 1, and y + z ≥ 0.4, such as y + z ≥ 0.6, especially y + z ≥ 0.8, including (essentially) y + z = 1. Herein, terms such as “x + y + z = 1”, and similar terms, may especially indicate x + y + z ≥ 0.99,such as x + y + z ≥ 0.995, especially x + y + z ≥ 0.998. That is, in K2AF6:Mn4+, wherein A isSixTiyGez, and x + y + z = 1, A may consist of one or more of Si, Ti, Ge, and optionally impurities to an amount of ≤ 1%, such as ≤ 0.5%, especially ≤ 0.2%, of A. Similarly, in M2(SixTiyGez)F6:Mn4+, wherein M is KaRbb, and a + b = 1, M may consist of one or more of K, Rb, and optionally impurities to an amount of ≤ 1%, such as ≤ 0.5%, especially ≤ 0.2%, of M. Hence, in specific embodiments, the first luminescent material may comprise K2(SixTiyGez)F6:Mn4+, wherein x ≥ 0, y ≥ 0, z ≥ 0, x + y + z = 1, and y + z ≥ 0.6 may apply. A first luminescent material comprising more Ti and / or Ge than Si may have absorption at larger wavelengths than a first luminescent material comprising more Si than Ti and / or Ge. Hence, such a first luminescent material may have a relatively high absorption for the first light source light, thereby providing the benefit that a concentration of the first luminescent material in the luminescent converter may be reduced. The first luminescent material may thus comprise K2(SixTiyGez)F6:Mn4+, wherein x ≥ 0, y ≥ 0, z ≥ 0, and x + y + z = 1. In embodiment, the first luminescent material may comprise mostly Ti as the tetravalent cation. That is, in embodiments, the first luminescent material may comprise K2(SixTiyGez)F6:Mn4+, wherein x ≥ 0, z ≥ 0, x + y + z = 1, and y ≥ 0.6, such as y ≥ 0.8, especially y ≥ 0.9, including (essentially) y = 1. Hence, in specific embodiments, (the first luminescent material may comprise K2(SixTiyGez)F6:Mn4+, wherein) y ≥ 0.8. A first luminescent material comprising mostly Ti as the tetravalent cation may have a more red-shifted absorption spectrum compared to a first luminescent material comprising a lower amount of Ti. Hence, such a first luminescent material may have an improved absorption at the first peak emission wavelength (λp1). Alternatively (or additionally), the first luminescent material may comprise a luminescent material of the type K2(SixTiyGez)F6:Mn4+, wherein x ≥ 0.5, such as x ≥ 0.7, especially x ≥ 0.9, like (essentially) K2SiF6:Mn4+(x = 1). Hence, in specific embodiments, the first luminescent material may comprise K2SiF6:Mn4+. A luminescent material of the type 2024PF80211 14 K2(SixTiyGez)F6:Mn4+comprising (essentially) only Si as the tetravalent cation may provide luminescent material light having a more red-shifted centroid wavelength compared to a luminescent material wherein the tetravalent cation comprising one or more of Ti and Ge. Yet, in embodiments, the first luminescent material may comprise a luminescent material of the type K2(SixTiyGez)F6:Mn4+, wherein x + y + z = 1, wherein x ≥ 0, y ≥ 0, z ≥ 0, and wherein x + z ≥ 0.3, such as x + z ≥ 0.5, especially x + z ≥ 0.7. As indicated above, the first luminescent material may comprise a combination of luminescent materials. Hence, in embodiments, the first luminescent material may comprise a luminescent material of the type M’xM2-2xAX6:Mn4+and a quantum structure (such as especially a quantum dot). Alternatively, the first luminescent material may (essentially) consist of one or more luminescent materials of the type M’xM2-2xAX6:Mn4+, wherein the one or more luminescent materials of the type M’xM2-2xAX6:Mn4+may differ in one or more of the composition of M and A. For instance, the first luminescent material may comprise a primary first luminescent material of the type (K,Rb)2(SixTiyGez)F6:Mn4+, wherein y + z ≥ 0.5, and a secondary first luminescent material of the type (K,Rb)2(SixTiyGez)F6:Mn4+, wherein y + z ≤ 0.5. In embodiments, 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. Especially, the first luminescent material may be configured to convert ≥ 50%, such as ≥ 60%, especially ≥ 70%, of (a spectral power 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 ≥ 80%, such as ≥ 90%, especially ≥ 95%, like ≥ 98%, including (essentially) 100%, of (a spectral power of) the first light source light received by the first luminescent material into first luminescent material light. Hence, in specific embodiments, the first luminescent material may be configured to convert at least 98% of the first light source light received by the first luminescent material into first luminescent material light. Converting ≥ 98% of (a spectral power of) the first light source light received by the first luminescent material into first luminescent material light may facilitate providing first device light being (essentially) free from first light source light. The first luminescent material light may have a first centroid wavelength (λc1). The term “centroid wavelength”, also indicated as λc, is known in the art, and refers to the 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 2024PF80211 15 the summation is over the wavelength range of interest, and I(λ) is the spectral energy density (i.e. the integration of the product of the wavelength and the intensity over the emission bandnormalized to the integrated intensity). The centroid wavelength may e.g. be determined atoperation conditions. In embodiments, the first centroid wavelength (λc1) may be selected from the range of 600-660 nm, like from the range of 610-650 nm, such as from the range of 620-640 nm, especially 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. Further, the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHM1 of ≤ 65 nm, such as ≤ 55 nm, especially ≤ 50 nm, like ≤ 40 nm. Further, the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHM1of ≤ 35 nm, such as ≤ 30 nm, especially ≤ 25 nm. Additionally or alternatively, the first luminescent material light may comprise the at least one emission band having a first full width at half maximum FWHM1of ≥ 2 nm, such as ≥ 5 nm, especially ≥ 7 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 FWHM1. 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 FWHM1. 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. The luminescent converter may comprise the first luminescent material in a first concentration C1. In embodiments, C1 may be selected from the range of ≥ 8 vol%, such as from the range of ≥ 10 vol%, especially from the range of ≥ 12 vol%, like from the range 2024PF80211 16 of ≥ 15 vol%. Additionally or alternatively, C1may be selected from the range of ≤ 40 vol%, such as from the range of ≤ 35 vol%, especially from the range of ≤ 30 vol%, like from the range of ≤ 25 vol%. Further, in embodiments, the first concentration C1 may be selected from the range of 8-40 vol%, such as from the range of 10-35 vol%, especially from the range of 12-30 vol%, like from the range of 15-25 vol%. Hence, in specific embodiments, the luminescent converter may comprise the first luminescent material in a first concentration C1, wherein the first concentration C1 may be selected from the range of 12-30 vol%. Such a first concentration C1may facilitate that the first luminescent material may be configured to convert ≥ 50%, such as ≥ 70%, especially ≥ 90%, of (a spectral power of) the first light source light received by the first luminescent material into first luminescent material light. In embodiments, as indicated above, the first luminescent material may be configured to convert at least 98% of (a spectral power 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 98% of (a spectral power of) the first light source light received by the luminescent converter into first luminescent material light. That is, the luminescent converter may comprise more of the first luminescent material than needed to transmit at most 2% of (a spectral power of) the first light source light received by the luminescent converter. Especially, the luminescent converter may comprise at least 1.1 times an amount, such as at least 1.2 times an amount, especially at least 1.5 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Additionally or alternatively, the luminescent converter may comprise at most 5 times an amount, such as at most 4 times an amount, especially at most 3 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Yet, in specific embodiments, the luminescent converter may comprise at least 1.2 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Such an amount of first luminescent material light in the luminescent converter may especially facilitate that even upon partial degradation of the first luminescent material (essentially) no first light source light may be transmitted through the luminescent converter. As the lifespan of the first solid state light source may be longer than a half-life of the first luminescent material, such a luminescent converter may improve the durability and lifespan of the first light generating device. The luminescent converter may comprise one or more further luminescent converter luminescent materials, such as selected from the luminescent materials provided 2024PF80211 17 above. In such embodiments, relative to a total weight of the first luminescent material and the one or more further luminescent converter luminescent materials, the first luminescent material may be present (in the luminescent converter) with a weight percentage of ≤ 98%, such as ≤ 95%, especially ≤ 90%. That is, a luminescent material content of the luminescent converter may consist for at most 98%, such as at most 95%, especially at most 90%, of the first luminescent material (wherein the percentage may indicate a weight percentage). Alternatively, a luminescent material content of the luminescent converter may consist for at least 70%, such as at least 80%, especially at least 90%, including (essentially) 100%, of the first luminescent material (wherein the percentage may indicate a weight percentage). That is, relative to a total weight of the first luminescent material and the one or more further luminescent converter luminescent materials, the first luminescent material may be present (in the luminescent converter) with a weight percentage of ≥ 70%, such as ≥ 80%, especially ≥ 90%, including (essentially) 100%. Hence, in specific embodiments, a luminescent material content of the luminescent converter may consist for at least 80% of the first luminescent material. Such a luminescent material content may facilitate that the light generated by the luminescent converter (upon irradiation with first light source light) may largely consist of first luminescent material light. Hence, the luminescent converter may comprise one or more further luminescent converter luminescent materials. Especially, the luminescent converter may comprise a second luminescent material. The second luminescent material may be any (combination) of the luminescent materials indicated above. The second luminescent material may comprise quantum structures, such as quantum dots or quantum rods. Hence, in embodiments, the second luminescent material may be selected from the group of quantum dot luminescent materials. (Additionally or) alternatively, the second luminescent material may comprise a phosphor. Especially, the second luminescent material may be selected from the group of oxynitride luminescent materials and nitride luminescent materials. Hence, in specific embodiments, the second luminescent material may be selected from the group of oxynitride luminescent materials, nitride luminescent materials, and quantum dot luminescent materials. Such a second luminescent material may provide second luminescent material light having a broad (FWHM ≥ 60 nm) emission band, thereby facilitating increasing the CRI of the system light (comprising the second luminescent material light). Further, such a second luminescent material may be relatively stable. Additionally or alternatively, the second luminescent material may comprise a luminescent material of the type MAlSiN3:Eu2+, wherein M may comprise one or more of Ba, 2024PF80211 18 Sr, and Ca (see also above). Further, in embodiments, the second 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. Additionally or alternatively, the second luminescent material may comprise a SiAlON-type phosphor, such as selected from the group comprising (a) Si12–m–nAlm+nOnN16–n:Eu2+, (b) Si6–nAlnOnN8–n:Eu2+, wherein 0 ≤ n ≤ 4.2, and (c) Si2– nAlnO1+nN2–n:Eu2+, wherein 0 ≤ n ≤ 0.2. Hence, in embodiments, the second luminescent material may comprise one or more of an oxynitride luminescent material, a nitride luminescent material, a luminescent material of the type MAlSiN3:Eu2+, an SLA-type phosphor, and a SiAlON-type phosphor. The second luminescent material may especially be different from the first luminescent material. Especially, the second luminescent material may comprise a different type of luminescent material than the first luminescent material.Alternatively, the first and second luminescent material may each comprise the same type(s)of luminescent material(s), wherein a composition of the (type(s) of) luminescent material(s) may differ between the first and second luminescent material. 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. Especially, the second luminescent material may be configured to convert ≥ 30%, such as ≥ 40%, especially ≥ 50%, of (a spectral power of) the first light source light received by the second luminescent material into second luminescent material light. Additionally or alternatively, the second luminescent material may be configured to convert ≤ 90%, such as ≤ 80%, especially ≤ 70%, of (a spectral power of) the first light source light received by the second luminescent material into second luminescent material light. The second luminescent material light may have a second centroid wavelength (λc2). The second centroid wavelength (λc2) may be selected from the range of 590-680 nm, such as from the range of 600-660 nm, especially from the range of 600-650 nm. Hence, the second luminescent material light may comprise, such as be, one or more of orange light and red light, such as especially red light. The second centroid wavelength (λc2) may be (roughly) equal to the first centroid wavelength (λc1), such as differ by ≤ 5 nm, especially by ≤ 2 nm, including by (essentially) 0 nm. Alternatively, the second centroid wavelength (λc2) may be different from the first centroid wavelength (λc1). In embodiments, |λc2-λc1| ≥ 0 nm, such as |λc2-λc1| ≥ 5 nm, especially |λc2-λc1| ≥ 10 nm. Additionally or alternatively, in embodiments, |λc2-λc1| ≤ 50 nm, such as |λc2-λc1| ≤ 40 nm, especially |λc2-λc1| ≤ 30 nm. Hence, in specific embodiments, the luminescent converter may comprise a second luminescent material, 2024PF80211 19 wherein the second luminescent material may be configured to convert 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 600-660 nm. A luminescent converter comprising a second luminescent material may provide (combined) luminescent material light having a broader spectral power distribution, thereby increasing a color rendering index (CRI), such as especially a CRI R9 score, of the first device light. The second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2of ≥ 50 nm, such as ≥ 60 nm, especially ≥ 70 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 FWHM2of ≤ 200 nm, such as ≤ 175 nm, especially ≤ 150 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. Especially, the second luminescent material may be selected from the group of oxynitride luminescent materials and nitride luminescent materials, wherein the second luminescent material light may have the second full width at half maximum FWHM2. Hence, in specific embodiments, the second luminescent material may be selected from the group of oxynitride luminescent materials and nitride luminescent materials, and the second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2of ≥ 60 nm. Such a second luminescent material may be relatively stable. Further, such a FWHM2 may facilitate improving especially a CRI R9 score of the first device light. The luminescent converter may comprise the second luminescent material in a second concentration C2. In embodiments, C2 may be selected from the range of ≥ 5 vol%, such as from the range of ≥ 7 vol%, especially from the range of ≥ 10 vol%. Additionally or alternatively, C2may be selected from the range of ≤ 35 vol%, such as from the range of ≤ 30 vol%, especially from the range of ≤ 25 vol%. Further, in embodiments, C2≤ C1, such as C2≤ 0.9*C1, especially C2 ≤ 0.75*C1. Additionally or alternatively, in embodiments, C2 ≥ 0.1*C1, such as C2≥ 0.2*C1, especially C2≥ 0.3*C1. Further, as indicated above, the luminescent converter may comprise one or more further luminescent converter luminescent materials. Yet, in embodiments, a luminescent material content of the luminescent convertermay consist for at least 10%, such as at least 15%, especially at least 20%, of the second 2024PF80211 20 luminescent material (wherein the percentage may indicate a weight percentage). Additionally or alternatively, a luminescent material content of the luminescent converter may consist for at most 40%, such as at most 35%, especially at most 30%, of the second luminescent material (wherein the percentage may indicate a weight percentage). That is, relative to a total weight of the first luminescent material, second luminescent material, and one or more further luminescent converter luminescent materials, the second luminescent material may be present (in the luminescent converter) with a weight percentage selectedfrom the range of 10-40%, such as from the range of 15-35%, especially from the range of20-30%. Hence, in specific embodiments, a luminescent material content of the luminescent converter may consists for at most 35% of the second luminescent material. Such a second luminescent material content may facilitate that the first luminescent material may provide the majority of the luminescent material content. Hence, such a second luminescent material content may facilitate that the optical properties of the first device light may more closely resemble the optical properties of the first luminescent material light. In embodiments, a luminescent material content of the luminescent converter may consist for at least 90%, such as at least 95%, especially at least 98%, including (essentially) 100%, of the first luminescent material and the second luminescent material. Alternatively, a luminescent material content of the luminescent converter may consist for at most 98%, such as at most 95%, especially at most 90%, of the first luminescent material and the second luminescent material. The first light generating device may be configured to generate first device light. In embodiments, the first device light may comprises one or more of the first light source light, the first luminescent material light, and the second luminescent material light. Yet, especially, the first device 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. Hence, in specific embodiments, the first device light may have a spectral power distribution wherein ≤ 1% of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. Such first device light may be (essentially) free from first light source light. Hence, such first device light may especially be free from (blue-)green light, facilitating implementation in e.g. cleanrooms. The first device light may thus be (essentially) free from first light source light. In embodiments, the first light generating device may comprise an optical filter, configured to absorb the first light source light (transmitted by the luminescent converter). Alternatively, the first luminescent material (and second luminescent material) may be 2024PF80211 21 configured to convert ≥ 98% of (a spectral power of) the first light source light received by the first luminescent material (and second luminescent material) into first luminescent material light (and second luminescent material light). Hence, the first device light may comprise one or more of the first luminescent material light and the second luminescent material light, such as especially at least the first luminescent material light. In specific embodiments, the first device light may (essentially) consist of the first luminescent material light (and optionally the second luminescent material light). Especially, the first device light may have a spectral power distribution, wherein ≥ 90%, such as ≥ 95%, especially ≥ 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light (and optionally the second luminescent material light). Further, the first device light may have a first device centroid wavelength (λcd,1). The first device centroid wavelength (λcd,1) 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. That is, in embodiments, the first device light may comprise, such as be, one or more of orange light and red light, such as especially red light. Hence, in specific embodiments, the first device light may have a first device centroid wavelength (λcd,1) selected from the range of 610-650 nm, wherein the first device light may be red light. A first light generating device configured to generate red first device light may be especially useful in (photography) darkroom and / or cleanroom applications, wherein the presence of blue (and short-wavelength green) light is undesired. In embodiments, the light generating system (comprising the first light generating device) may be configured to generate system light. The system light may comprise the first device light. In specific embodiments, the system light may consist of the first device light. Alternatively, the system light may comprise contributions from further light generating means (see also below). The system light may have a system centroid wavelength (λcc). In embodiments, as indicated above, the system light may (essentially) consist of the first device light, and the system centroid wavelength (λcc) 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. That is, in embodiments, the system light may comprise, such as be, one or more of orange light and red light, such as especially red light. Hence, in specific embodiments, the light generating system may be configured to generate system light, wherein the system light may comprise the first device light, and wherein the system light may have a system centroid wavelength (λcc) selected 2024PF80211 22 from the range of 610-650 nm. Such system light may be suitable for darkroom applications. Further, a light generating system configured to generate red system light may function as a red phosphor-converted light source in a lighting device. 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 lens, a diffuser, electrical connective elements (e.g.wiring), a heat sink, etc.. Especially, the LED package (of the light generating system) maycomprise the first light generating device (i.e., the LED package may at least comprise the first solid state light source and the luminescent converter). Hence, in specific embodiments, the light generating system may comprises a LED package, wherein the LED package may comprise the first light generating device. A LED package may facilitate providing thermal management for the first solid state light source. Further, a LED package may facilitate providing one or more of light guiding and beam shaping for the first device light, as well as improving the lifespan of the first light generating device. 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 is 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 light generating device) may be especially based on the conversion of (blue-green) first light source light by a (“KSiF”) first luminescent material. Hence, the invention may especially provide a pc-LED comprising ‘KSiF’ phosphor providing reliable red light. In embodiments, a LED package may further comprise multiple sub-packages, wherein each sub-package may be a LED package as described above. Hence, in embodiments, the light generating system may comprise a LED package comprising the first light generating device and one or more additional light generating devices. Especially, the light generating system may comprise a LED package comprising the first light generating 2024PF80211 23 device, a second light generating device, and a third light generating device. In such embodiments, as indicated above, (the first light generating device may be configured to generate first device light, wherein) the first device light may have a first device centroid wavelength (λcd,1) 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. 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 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). Further, the second solid state light source may be configured to generate second light source light. The second light source light may especially have a second peak emission wavelength (λp2) selected from the range of 360-500 nm, such as from the range of 380-490 nm, especially from the range of 400-470 nm. Further, the second light source light may have a spectralpower distribution, wherein ≥ 80%, such as ≥ 90%, especially ≥ 95%, including (essentially)100%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm, such as especially in the wavelength range of 400-470 nm. Hence, the second light source light may be one or more of violet light and blue light, such asespecially blue light. Further, the second light generating device may comprise a secondluminescent converter. The second luminescent converter may be configured as a coating on (top of) the second solid state light source. Further, the second luminescent converter may comprise a third luminescent material. The third luminescent material may be selected from any of the luminescent materials indicated above. In specific embodiments, the third luminescent material may comprise one or more luminescent materials of the type A3B5O12:Ce, wherein A may comprise one or more of Y, La, Gd, Tb and Lu, and wherein B may comprise one or more of Al, Ga, In and Sc. The third luminescent material may be configured to convert at least part of the second light source light received by the third luminescent material into third luminescent material light. Especially, the third luminescent material may be configured to convert ≥ 80%, such as ≥ 90%, especially ≥ 95%, including (essentially) 100%, of (a spectral power of) the second light source light received by the third luminescent material into third luminescent material light. The third luminescent material light may have a third centroid wavelength (λc3). Especially, the third centroid wavelength (λc3) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-580 nm. Hence, the third luminescent material light maycomprise, such as be, one or more of green light and yellow light (including some blue and 2024PF80211 24 orange tones). The term “yellow light” or “yellow emission”, and similar terms, may especially relate to light having a wavelength in the range of about 560-590 nm. Further, the second light generating device may be configured to generate second device light. The second device light may comprise the third luminescent material light. Further, in embodiments, the second device light may comprise the second light source light. Yet, especially, the second device light may (essentially) consist of the third luminescent material light. The second device light may have a second device centroid wavelength (λcd,2). The second device centroid wavelength (λcd,2) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-580 nm. That is, the second device light may comprise, such as be, one or more of green light and yellow light (including some blue and orange tones). Especially, the second device light may be green light. Hence, in specific embodiments, the second solid state light source may be configured to generate second light source light having a second peak emission wavelength (λp2) selected from the range of 380-490 nm, and the second light generating device may comprise a second luminescent converter, wherein the second luminescent converter may comprise a third luminescent material; wherein the third luminescent material may be configured to convert at least part of the second 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 490-590 nm; and wherein the second device light may comprise the third luminescent material light. A second light generating device providing yellow and / or green light based on the conversion of blue light by a luminescent material may be more energy efficient than a second light generating device comprising a second solid state light source (directly) providing said yellow and / or green light. As indicated above, the LED package may further comprise a third light generating device. The third light generating device may especially comprise a third solid state light source. The third 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). Further, the third solid state light source may be configured to generate third light source light. The third light source light may especially have a third peak emission wavelength (λp3) selected from the range of 380-500 nm, such as from the range of 400-490 nm, especially from the range of 430-490, like from the range of 430-470 nm. Further, the third light source light may have a spectral power distribution, wherein ≥ 80%, such as ≥ 2024PF80211 25 90%, especially ≥ 95%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 400-490 nm, such as especially inthe wavelength range of 430-490 nm. Hence, the third light source light may be one or moreof violet light and blue light, such as especially blue light. Further, the third light generating device may be configured to generate third device light. The third device light may comprise the third light source light. In specific embodiments, the third device light may (essentially) consist of the third light source light. In such embodiments, the third light generating device may comprise a light transparent coating, configured on top of (and in physical contact with) a light escape surface of the third solid state light source. The light transparent coating may in embodiments comprise a light scattering material, wherein the light scattering material may be configured to scatter (or “diffuse”) the third light source light. The light scattering material may comprise light scattering particles, such as e.g. at least one of BaSO4, A12O3 and TiO2 particles. Further, the third device light may have a third device centroid wavelength (λcd,3). In embodiments, the third device centroid wavelength (λcd,3) may be selected from the range of 380-500 nm, such as from the range of 400-490 nm, especially from the range of 430-490, like from the range of 430-470 nm. Hence, the third device light may be one or more of violet light and blue light, such as especially blue light. In embodiments, the light generating system (comprising the LED package) may be configured to generate system light. The system light may comprise one or more of the first device light, the second device light, and the third device light. In embodiments, the system light may be colored light, such as selected from the group of blue light, green light, yellow light, orange light, and red light. Especially, the system light may be colored light having a color point selected from the CIE 1931 color space. Alternatively, the system light may 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 1800 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) is especially within about 20 SDCM (standard deviation of color matching) from the BBL (black body locus), such as within 15 SDCM from the BBL, especially within 10 SDCM from the BBL, like within 5 SDCM from the BBL. Especially, in a first operational mode of the light generating system (comprising the LED package), the system light may be white light. In such embodiments, the system light may especially comprise the first device light, the second device light, and the third device light. Further, the (white) system light (of the 2024PF80211 26 first operational mode) may have a correlated color temperature (CCT) selected from the range of ≥ 1300 K, such as from the range of ≥ 1500 K, especially from the range of ≥ 1700 K. Additionally or alternatively, the system light may have a CCT selected from the range of ≤ 8500 K, such as from the range of ≤ 8000 K, especially from the range of ≤ 7500 K. Hence, the system light may have a CCT selected from the range of 1300-8500 K, such as from the range of 1500-8000 K, especially from the range of 1700-7500 K. Further, the system light may have a color rendering index (CRI) of at least 75, such as at least 80, especially at least 85. The system light may have a (CRI) R9 score of ≥ 55, such as ≥ 60, especially ≥ 65. Hence, in specific embodiments, the light generating system may comprise a LED package, wherein the LED package may comprise the first light generating device, a second light generating device, and a third light generating device, wherein: (A) the first device light may have a first device centroid wavelength (λcd,1) selected from the range of 610-650 nm; (B) the second light generating device may comprise a second solid state light source, wherein the second light generating device may be configured to generate second device light having a second device centroid wavelength (λcd,2) selected from the range of 490-590 nm; wherein the second device light may be green light; (C) the third light generating device may comprise a third solid state light source, wherein the third light generating device may be configured to generate third device light having a third device centroid wavelength (λcd,3) selected from the range of 430-490 nm; wherein the third device light may be blue light; and (D) in a first operational mode of the light generating system, the light generating system may be configured to generate white system light with a CCT selected from the range of 1500-8000 K. Such a light generating system may especially provide white light suitable for both home (mood) lighting as well as e.g. office lighting. Further, a light generating system comprising a LED package may be relatively compact and energy efficient. In embodiments, the LED package may further comprise a fourth light generating device. The fourth light generating device may especially comprise a fourth solid state light source and a fourth luminescent converter. The fourth 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). Further, the fourth solid state light source may be configured to generate fourth light source light. The fourth light source light may especially have a fourth peak emission wavelength (λp4) selected from the range of 360-500 nm, such as from the range of 380-490 nm, especially from the range of 400-470 nm. Further, the fourth light source light may have a spectral power distribution, wherein ≥ 80%, such as ≥ 90%, 2024PF80211 27 especially ≥ 95%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm, such as especially in the wavelength range of 400-470 nm. Hence, the fourth light source light may be one or more of violet light and blue light, such as especially blue light. Further, the fourth luminescent converter may comprise a fourth luminescent material. The fourth luminescent material may comprise one or more luminescent materials selected from the luminescent materials indicated above. In specific embodiments, the fourth luminescent material may comprise a luminescent material of the type A3B5O12:Ce, wherein A may comprise one or more of Y, La, Gd, Tb and Lu, and wherein B may comprise one or more of Al, Ga, In and Sc. Additionally or alternatively, the fourth luminescent material may comprise one or more luminescent materials of the type M’xM2-2xAX6doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine. Further, the fourth luminescent material may comprise one or more of an oxynitride luminescent material, a nitride luminescent material, a luminescent material of the type MAlSiN3:Eu2+, an SLA-type phosphor, and a SiAlON-type phosphor. Hence, in embodiments, the fourth luminescent material may comprise a primary fourth luminescent material configured to generate one or more of yellow light and green light, and a secondary fourth luminescent material configured to generate one or more of orange light and red light. The fourth luminescent material may be configured to convert at least part of the fourth light source light received by the fourth luminescent material into fourth luminescent material light. Especially, the fourth luminescent material may be configured to convert ≥ 75%, such as ≥ 80%, especially ≥ 85%, like ≥ 90%, of (a spectral power of) the fourth light source light received by the fourth luminescent material into fourth luminescent material light. Additionally or alternatively, the fourth luminescent material may be configured to convert ≤ 98%, such as ≤ 95%, especially ≤ 90%, of (a spectral power of) the fourth light source light received by the fourth luminescent material into fourth luminescentmaterial light. The fourth luminescent material light may have a fourth centroid wavelength(λc4). Especially, the fourth centroid wavelength (λc4) may be selected from the range of 500- 650 nm, such as from the range of 515-630 nm, especially from the range of 530-600 nm. Further, the fourth light generating device may be configured to generate fourth device light. In embodiments, the fourth device light may comprise the fourth luminescent material light.Additionally, the fourth device light may comprise part of the fourth light source light.Especially, the fourth device light may have a spectral power distribution, wherein ≥ 1%, 2024PF80211 28 such as ≥ 2%, especially ≥ 5%, of the spectral power in the wavelength range of 380-780 nm may be provided by the fourth light source light. Additionally or alternatively, the fourth device light may have a spectral power distribution, wherein ≤ 15%, such as ≤ 12%, especially ≤ 10%, of the spectral power in the wavelength range of 380-780 nm may be provided by the fourth light source light. The fourth device light may in embodiments be white light. Especially, the fourth device light may be white light having a CCT selected from the range of 1300-8500 K, such as from the range of 1500-8000 K, especially from the range of 1700-7500 K. In embodiments, the system light may comprise the fourth device light. Hence, the system light may comprise one or more of (i) red first device light, (ii) green (and / or yellow) second device light, (iii) blue third device light, and (iv) white fourth device light. Especially, the system light may comprise the fourth device light and one or more of the first, second, and third device light, wherein the system light may be white light. Alternatively, the system light may comprise the fourth device light and one or more of the first, second, and third device light, wherein the system light may be colored light. Further, the system light may comprise at least two of the first, second, and third device light (and (essentially) not comprise the fourth device light), wherein the system light may be white light. Alternatively,the system light may comprise one or more of the first, second, and third device light (and(essentially) not comprise the fourth device light), wherein the system light may be colored light. In embodiments, the first light generating device, second light generating device, third light generating device, and optional fourth light generating device may be individually controlled (within the LED package). Hence, the light generating system may comprise a control system. The control system may be configured to individually control the first light generating device, the second light generating device, the third light generating device, and the optional fourth light generating device. Especially, the control system may be configured to individually control an intensity of the first device light, the second devicelight, the third device light, and the optional fourth device light. Hence, the control systemmay be configured to control the optical properties of the system light. Especially, the control system may be configured to control one or more of a CCT, CRI, CRI R9 (score), color point, and intensity of the system light. 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 2024PF80211 29 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 controlsystem. The lighting system may also comprise means for communicating with other systemsor 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. Some general embodiments relating to the light source will be provided next. 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)) 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 in embodiments also refer to a so-called chip-on- board (CoB) light source. The term “CoB” especially refers 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. In embodiments, a CoB is a multi LED chip configured together as a single lighting module. 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 2024PF80211 30 one or more of mini LEDs and micro LEDs, such as especially micro LEDs or “microLEDs” or “µLEDs”. 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 fromthe range of 100 µm – 1 mm. Herein, the term µ size or micro LED especially refers to solidstate light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 µm and smaller. 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. Theterm escape surface especially relates to that part of the light source, where the light actuallyleaves 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. 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. 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 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 2024PF80211 31 distribution. The light source light may in embodiments comprise one or more bands, having band widths as known for lasers 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, AlGaInP, 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. 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 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. 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. 2024PF80211 32 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. Thebeams (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). In embodiments, the light generating system may comprise a Chip-on-Board (CoB). Especially, the first light generating device may comprise, such as be, a CoB. The Chip-on-Board may comprise a plurality of the first solid state light source. As indicated above, the term “CoB” may especially refer to LED chips in the form of a semiconductor chip that is directly mounted onto a substrate. Hence, in embodiments, the CoB may comprise a plurality of the first solid state light source, wherein the first solid state light source may especially be an LED. Further, in embodiments, the Chip-on-Board may comprise the luminescent converter (configured as a coating). The luminescent converter may be configured on top of (and in physical contact with) the plurality of first solid state light sources. 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 light generating system comprising a CoB may be relatively compact, as no separate holder is needed for the first solid state light sources and / or the luminescent converter. Further, a CoB may be relatively easy to produce. Additionally or alternatively, the light generating system may comprise a LED filament. Hence, the light generating system may comprise (both) a CoB and a LED filament. Alternatively, the light generating system may comprise one of a CoB and a LED filament. Further, the first light generating device may comprise a LED filament. Hence, the first light generating device may comprise (both) a CoB and a LED filament. Alternatively, the first light generating device may comprise one of a CoB and a LED filament. In specific embodiments, the first light generating device may be a LED filament. LED filaments as such are known, and are e.g. described in US 8,400,051 B2, WO2020016058, WO2019197394, etc., which are hereby herein incorporated by reference. In general, a LED 2024PF80211 33 filament may in embodiments 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 / WFor LF / TF), such as 10*WF ≤ LF ≤ 900*WF, and 10*TF ≤ LF ≤ 900*TF. In some embodiments, the LED filament may be straight. In other embodiments, the LED filament may be curved. For instance, the filament may have a (2D or 3D) spiraling shape, (like) a helical shape. Further, 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. Further, 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. Further, the elongated carrier may be light transmissive, translucent, or transparent for light, especially visible light. Alternatively, the carrier may be light reflective, especially reflective for one or more of the first (and / or second) light source light and the first (and / or second) luminescent material light, such as reflective for at least the first (and / or second) light source light and the first (and / or second) 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. The solid state light sources may be arranged on at least one of these surfaces. Hence, 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, 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. The LED filament may comprise one or more of LEDs, laser diodes, superluminescent diodes, and multi-junction diodes. Especially, the LED filament may comprise a plurality of LEDs. The (plurality of) solid state light sources may be arranged in an array (on the elongated carrier). The number of solid state light sources in the array may be ≥ 4, such as ≥ 8, even more 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. 2024PF80211 34 The solid state light sources may be configured in a 1D (linear) array. 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 in embodiments 1 or in embodiments 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 especially 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. The LED filament may comprise an elongated encapsulant. The encapsulant may (at least partly) enclose the plurality of solid state light sources. Further, the encapsulant may (at least partly) enclose the elongated carrier, such as at least (part of) one of the first major and second major surface. In general, the encapsulant may be in contact with the elongated carrier and may at least partially enclose all of the solid state light sources. The encapsulant may be a continuous coating along the filament length LF, at one or both of the first major and the second major surface. Further, the encapsulant may at least partly enclose the solid state light sources, such as in embodiments at least 50% of the total number of solid state light sources in the array, such as at least 75%, especially at least 95%, up to 100%. The encapsulant may comprise the luminescent converter. Alternatively, the luminescent converter may be an encapsulant, i.e., the luminescent converter may be configured as an encapsulant. Additionally or alternatively, the encapsulant may comprise a light scattering material, configured embedded in an encapsulant material, e.g. a (flexible) polymer material (such as a silicone). In embodiments, the light scattering material may be configured to scatter (or “diffuse”) the first (and / or second) light source light and / or the first (and / or second) luminescent material 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, such as e.g. at least one of BaSO4, A12O3 and TiO2 particles. In embodiments, the LED filament may comprise multiple subfilaments. Hence, the light generating system may comprise a LED filament, wherein the LED filament may comprise a plurality of the first solid state light source arranged on an elongated carrier. Further, the first light generating device may comprise, such as especially be, a LED filament, wherein 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 configured in physical contact with and covering (such as at least 2024PF80211 35 partially enclosing) 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. Alternatively, the luminescent converter may be configured as an elongated encapsulant. Hence, in specific embodiments, 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 configured in physical contact with and covering the plurality of first solid state light sources and at leastpart of the elongated carrier; wherein the elongated encapsulant may comprise theluminescent converter. A light generating system comprising a LED filament may facilitate using the light generating system in decorative light bulbs, as such a light generating system may better resemble a filament of a conventional fluorescent light bulb. The light generating system may 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, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive lighting devices, stage lighting devices, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems. 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 furthercomprise a housing enclosing the light generating system. The lamp or luminaire maycomprise a light window in the housing or a housing opening, through which the system light may escape from the housing. In yet a further aspect, the invention also provides a projection device comprising the light generating system as defined herein. Especially, a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection device may include one or more light generating systems such as described herein. Further, the invention may provide one or more of a disinfection device, a photochemical reactor, an automotive lighting device, a stage lighting device, and an optical wireless communication device, comprising the light generating system as defined herein. Hence, according to a 2024PF80211 36 second aspect, the invention provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, an automotive lighting device, a stage lighting device, and an optical wireless communication device, comprising the light generating 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. 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. BRIEF DESCRIPTION OF THE DRAWINGS 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: Figs. 1A-B schematically depict an embodiment of the light generatingsystem; Figs. 2A-B schematically depict an embodiment of the first luminescentmaterial light and the first device light; Fig.3 schematically depicts an embodiment of the light generating system comprising a LED package; Fig.4 schematically depicts an embodiment of the light generating system comprising a CoB; Fig.5 schematically depicts an embodiment of the light generating system comprising a LED filament; and Fig.6 schematically depicts an embodiment of the lighting device. The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig.1A schematically depicts an embodiment of the light generating system 1000. The light generating system 1000 may comprise a first light generating device 110.Further, the first light generating device 110 may comprise a first solid state light source 10and a luminescent converter 2000. The first solid state light source 10 may be configured to 2024PF80211 37 generate first light source light 11 having a first peak emission wavelength (λp1) selected from the range of 490-500 nm. Further, the luminescent converter 2000 may be configured in a light receiving relationship with the first solid state light source 10. The luminescent converter 2000 may comprise a first luminescent material 210. Especially, the first luminescent material 210 may be a luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese, wherein M’ may comprise an alkaline earth cation, M may comprise an alkaline cation, and x may be in the range of 0-1, wherein A may comprise a tetravalent cation, and wherein X may comprise a monovalent anion, at least comprising fluorine. 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. The first luminescent material light 211 may especially 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 width at half maximum FWHM1 of ≤ 40 nm. The first light generating device 110 may be configured to generate first device light 111 comprising the first luminescent material light 211. Especially, the first device light 111 may have a spectral power distribution, wherein ≤ 2% of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light 11. In the embodiments depicted in Fig.1A, Fig.1B, Fig.4, and Fig.5, for clarity some first light source light 11 is depicted as being emitted from the first light generating device 110. It should be noted that in embodiments (essentially) all first light source light 11 may be converted into first (and / or second, see below) luminescent material light, and the first device light may be (essentially) free from first light source light 11. Especially, the first luminescent material 210 may be configured to convert at least 98% of (a spectral power of) the first light source light 11 received by the first luminescent material 210 into first luminescent material light 211. The luminescent converter 2000 may be configured as a coating. Especially, the luminescent converter 2000 may be configured covering and in physical contact with (a light escape surface of) the first solid state light source 10. Further, the luminescent converter 2000 may be configured in a transmissive mode. That is, first luminescent material light 211 may travel from the luminescent converter 2000 in the same direction as first light source light 11 travels to the luminescent converter 2000 (upstream of the luminescent converter 2000). As indicated, the first device light 111 may be (essentially) free from first light source light. Especially, the first device light 111 may have a spectral power distribution, wherein ≤ 1% of the spectral power in the wavelength range of 380-780 nm may be provided by the 2024PF80211 38 first light source light 11. Further, the luminescent converter 2000 may comprise at least 1.2 times an amount of the first luminescent material 210 needed to transmit at most 2% of the first light source light 11 received by the luminescent converter 2000. Especially, the luminescent converter 2000 may comprise the first luminescent material 210 in a first concentration C1. The first concentration C1may be selected from the range of 12-30 vol%. Hence, the first device light (111) may in embodiments (essentially) consist of the first luminescent material light 211. Especially, the first device light 111 may have a first device centroid wavelength (λcd,1) selected from the range of 610-650 nm. Hence, the first device light 111 may be red light. Further, the light generating system 1000 may be configured to generate system light 1001. The system light 1001 may especially comprise the first device light 111. Hence, in embodiments, the system light 1001 may be red light. Especially, in embodiments, the system light 1001 may have a system centroid wavelength (λcc) selected from the range of 610-650 nm. The light generating system 1000 may comprise a LED package 500, comprising the first light generating device 110. The LED package may further comprise one or more additional (optical) elements. For instance, in Fig.1A and 1B, the LED package comprises a reflective cup 900. Fig.1B schematically depicts a further embodiment of the light generating system 1000. The luminescent converter 2000 may comprise a second luminescent material 220. The second luminescent material 220 may be configured to convert part of the first light source light 11 received by the second luminescent material 220 into second luminescent material light 221. The second luminescent material light 221 may especially have a second centroid wavelength (λc2) selected from the range of 600-660 nm. Further, the second luminescent material 220 may be selected from the group of oxynitride luminescent materials, nitride luminescent materials, and quantum dot luminescent materials. A luminescent material content of the luminescent converter 2000 may consist for at most 35% of the second luminescent material 220. Additionally or alternatively, a luminescent material content of the luminescent converter 2000 may consist for at least 80% of the first luminescent material 210. Fig.2A schematically depicts an embodiment of the first device light 111 comprising (at least) the first luminescent material light 211. As indicated above, the first luminescent material light 211 may have a first centroid wavelength (λc1) selected from the range of 610-650 nm, like from the range of 620-640 nm, especially from the range of 625- 635 nm. Further, the first light source light 11 may have a first peak emission wavelength (λp1) selected from the range of 490-500 nm, such as about 495 nm. In Fig.2A, a first peak 2024PF80211 39 emission wavelength (λp1) of 490 nm is indicated by reference λp1a, and a first peak emission wavelength (λp1) of 500 nm is indicated by reference λp1b. Further, the dashed lines indicate the color gamut of the first device light 111. That is, the dashed lines indicate the boundaries of the color gamut of the first device light 111, and the first light generating device 110 may be configured to generate first device light 111 having any color point selected from the color points within the boundaries. The shaded area in Fig.2A indicates the range of color points perceived as “red” by a standard observer. As can be seen, by using a combination of a “KSiF” phosphor (as the first luminescent material 210) and a first solid state light source 10 configured to generate first light source light 11 with 490 nm ≤ λp1≤ 500 nm, the first light generating device 110 may be configured to generate first device light 111 having a red color. Further, even upon admixing some first light source light 11 into the first device light 111 (e.g. upon degradation of the first luminescent material 210), the first device light 111 may retain a red color, thereby providing a reliable red pc-LED comprising “KSiF” phosphor. Fig.2B schematically depicts an embodiment of the first luminescent material light 211. Reference 212 indicates the absorption and / or excitation spectrum of the first luminescent material 210. The first luminescent material 210 may comprise, such as be, a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese (see also above). Especially, the first luminescent material 210 may be a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein A may comprise one or more of titanium and germanium. The first luminescent material 210 may in embodiments further comprise K2(SixTiyGez)F6:Mn4+, wherein x ≥ 0, y ≥ 0, z ≥ 0, x + y + z = 1, and y + z ≥ 0.6. Especially, in such embodiments, y ≥ 0.8 may apply. Reference 212b indicates the absorption / excitation spectrum of a first luminescent material 210 wherein y ≥ 0.8 mayapply, and reference 211b indicates the corresponding first luminescent material light. Yet, inembodiments, the first luminescent material 210 may comprise K2SiF6:Mn4+. The absorption / excitation spectrum of a first luminescent material 210 comprising K2SiF6:Mn4+is indicated by reference 212a, and the corresponding first luminescent material light 211 is indicated by reference 211a. Further, the first luminescent material may comprise K2(SixTiyGez)F6:Mn4+, wherein z > 0, such as z ≥ 0.5 may apply. The absorption / excitation spectrum of such a first luminescent material 210 is indicated by reference 212c, and the corresponding first luminescent material light 211 is indicated by reference 211c. Further yet, the first luminescent material may comprise K2(SixTiyGez)F6:Mn4+, wherein z > 0 and x >0, such as z ≥ 0.4 and x ≥ 0.4 may apply. The absorption / excitation spectrum of such a first 2024PF80211 40 luminescent material 210 is indicated by reference 212d, and the corresponding first luminescent material light 211 is indicated by reference 211d. Referring to Fig.2B, the (first) luminescent material of the type M’xM2-2xAX6 provides multiple narrow emission bands (“lines”) in (amongst others) the red wavelength range. Essentially each of these bands may have a full width half maximum well below 50 nm, such as below 20 nm. Of course, such narrow bands may (partly) merge into broader bands. However, it is also noted that the width of the narrow bands in the emission spectra may also (partly) be due to the spectral resolution of the measurement setup. Hence, the first luminescent material light 211 may have a first centroid wavelength (λc1) selected from the wavelength range of 610-650 nm, and may comprise one or more emission bands having a first full width half maximum (FWHM1) of ≤ 50 nm. Fig.3 schematically depicts an embodiment of the light generating system 1000 comprising a LED package 500. The LED package 500 may comprise the first light generating device 110, a second light generating device 120, and a third light generating device 130. The first device light 111 (of the first light generating device 110) may have a first device centroid wavelength (λcd,1) selected from the range of 610-650 nm. Further, the second light generating device 120 may comprise a second solid state light source 20. The second light generating device 120 may especially be configured to generate second device light 121 having a second device centroid wavelength (λcd,2) selected from the range of 490- 590 nm. Especially, the second device light 121 may be green light. Further, the third light generating device 130 may comprise a third solid state light source 30. Optionally, the third light generating device 130 may comprise a light transparent coating 135 comprising a light scattering material. The third light generating device 130 may be configured to generate third device light 131 having a third device centroid wavelength (λcd,3) selected from the range of 430-490 nm. Especially, the third device light 131 may be blue light. In a first operational mode of the light generating system 1000, the light generating system 1000 may be configured to generate system light 1001 comprising the first device light 111, the second device light 121, and the third device light 131. Especially, (in the first operational mode,) the system light 1001 may be white light with a CCT selected from the range of 1500-8000 K (and a color rendering index of at least 80). The second solid state light source 20 may be configured to generate second light source light 21 having a second peak emission wavelength (λp2) selected from the range of 380-490 nm. Further, the second light generating device 120 may comprise a second luminescent converter 2200. The second luminescent converter 2200 may comprise a third 2024PF80211 41 luminescent material 230. The third luminescent material 230 may especially be configured to convert at least part of the second light source light 21 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 490-590 nm. Further, the second device light 121 may comprise the third luminescent material light 231. The LED package 500 may further comprise a fourth light generating device 140. The fourth light generating device 140 may comprise a fourth solid state light source 40. The fourth solid state light source 40 may be configured to generate fourth light source light 41 having a fourth peak emission wavelength (λp4) selected from the range of 380-490 nm. Further, the fourth light generating device 140 may comprise a fourth luminescent converter 2400. The fourth luminescent converter 2400 may comprise a fourth luminescent material 240. The fourth luminescent material 240 may especially be configured to convert at least part of the fourth light source light 41 received by the fourth luminescent material 240 into fourth luminescent material light 241. The fourth light generating device 140 may be configured to generate fourth device light 141 comprising the fourth luminescent material light 241 and at least part of the fourth light source light 41. In embodiments, the fourth device light may be white light. For clarity, the first, second, third, and fourth solid state light sources 10,20,30,40 are indicated with dashed lines in Fig.3. The light generating system 1000 may comprise a control system 300. The control system 300 may especially be configured to individually control the first light generating device 110, the second light generating device 120, the third light generating device 130, and the fourth light generating device 140. Fig.4 schematically depicts a light generating system 1000 comprising a Chip-on-Board (CoB) 600. Especially, the first light generating device 110 may be a CoB 600. The Chip-on-Board (CoB) 600 may comprise (i) a plurality of the first solid state light source 10, and (ii) the luminescent converter 2000. The luminescent converter 2000 may especially be configured on top of the plurality of first solid state light sources 10. In the CoB 600, the plurality of first solid state light sources 10 may be directly mounted onto a substrate 6 (e.g. a PCB). Fig.5 schematically depicts an embodiment of the light generating system 1000 comprising a LED filament 400. Especially, the first light generating device 110 may be a LED filament 400. The LED filament 400 may comprise (i) a plurality of the first solid state light source 10 arranged on an elongated carrier 5, and (ii) an elongated encapsulant 410 configured in physical contact with and covering (such as at least partially enclosing) the 2024PF80211 42 plurality of first solid state light sources 10 and at least part of the elongated carrier 5. The elongated encapsulant 410 may comprise the luminescent converter 2000. Fig.6 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.6 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Reference 3 indicates a projector device, which may also comprise the light generating system 1000. Reference 4 indicates an automotive lighting device, which may also comprise the light generating system 1000. Hence, Fig.6 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, an automotive lighting device 4, a stage lighting device, and an optical wireless communication device, 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 system light 1001, and may in specific embodiments 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. The term “plurality” refers to two or more. The terms “substantially” or “essentially” herein, 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 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 2024PF80211 43 to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. 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. 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. 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 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. 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

2024PF80211 44 CLAIMS:

1. A light generating system (1000) comprising a first light generating device(110), wherein the first light generating device (110) comprises 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 emission wavelength (λp1) selected from the range of 490-500 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); wherein the first luminescent material (210) is a luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine; 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); wherein the first luminescent material light (211) has a first centroid wavelength (λc1) selected from the range of 610-650 nm; wherein the first luminescent material light (211) comprises at least one emission band having a first full width at half maximum FWHM1 of ≤ 50 nm; and the first light generating device (110) is configured to generate first device light (111) comprising the first luminescent material light (211); wherein the first device light (111) has a spectral power distribution, wherein ≤ 2% of the spectral power in the wavelength range of 380-780 nm is provided by the first light source light (11).

2. The light generating system (1000) according to claim 1, wherein the firstluminescent material (210) is a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein A comprises one or more of titanium and germanium.2024PF80211 453. The light generating system (1000) according to any one of the precedingclaims, wherein the first luminescent material (210) comprises K2(SixTiyGez)F6:Mn4+, wherein x ≥ 0, y ≥ 0, z ≥ 0, x + y + z = 1, and y + z ≥ 0.6.

4. The light generating system (1000) according to claim 3, wherein y ≥ 0.8.

5. The light generating system (1000) according to any one of the precedingclaims, wherein a luminescent material content of the luminescent converter (2000) consists for at least 80% of the first luminescent material (210).

6. The light generating system (1000) according to any one of the precedingclaims, wherein the luminescent converter (2000) comprises at least 1.2 times an amount of the first luminescent material (210) needed to transmit at most 2% of the first light source light (11) received by the luminescent converter (2000).

7. The light generating system (1000) according to any one of the precedingclaims, wherein the luminescent converter (2000) comprises the first luminescent material (210) in a first concentration C1, wherein the first concentration C1is selected from the range of 12-30 vol%.

8. The light generating system (1000) according to any one of the precedingclaims, wherein the first device light (111) has a first device centroid wavelength (λcd,1) selected from the range of 610-650 nm, wherein the first device light (111) is red light.

9. The light generating system (1000) according to any one of the precedingclaims, wherein the luminescent converter (2000) comprises a second luminescent material (220), wherein the second luminescent material (220) is configured to convert part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221); wherein the second luminescent material light (221) has a second centroid wavelength (λc2) selected from the range of 600-660 nm.

10. The light generating system (1000) according to claim 9, wherein the secondluminescent material (220) is selected from the group of oxynitride luminescent materials, nitride luminescent materials, and quantum dot luminescent materials.2024PF80211 4611. The light generating system (1000) according to any one of claims 9-10,wherein a luminescent material content of the luminescent converter (2000) consists for at most 35% of the second luminescent material (220).

12. The light generating system (1000) according to any one of the precedingclaims, wherein the luminescent converter (2000) is configured as a coating; wherein the luminescent converter (2000) is configured covering and in physical contact with the first solid state light source (10); wherein the luminescent converter (2000) is configured in a transmissive mode; and wherein the first device light (111) has a spectral power distribution wherein ≤ 1% of the spectral power in the wavelength range of 380-780 nm is provided by the first light source light (11).

13. The light generating system (1000) according to any one of the precedingclaims, wherein the light generating system (1000) comprises a LED package (500), wherein the LED package (500) comprises the first light generating device (110), a second light generating device (120), and a third light generating device (130), wherein: the first device light (111) has a first device centroid wavelength (λcd,1) selected from the range of 610-650 nm; the second light generating device (120) comprises a second solid state light source (20), wherein the second light generating device (120) is configured to generate second device light (121) having a second device centroid wavelength (λcd,2) selected from the range of 490-590 nm; wherein the second device (121) light is green light; the third light generating device (130) comprises a third solid state light source (30), wherein the third light generating device (130) is configured to generate third device light (131) having a third device centroid wavelength (λcd,3) selected from the range of 430- 490 nm; wherein the third device light (131) is blue light; and in a first operational mode of the light generating system (1000), the light generating system (1000) is configured to generate system light (1001) comprising the first device light (111), the second device light (121), and the third device light (131), wherein the system light (1001) is white light with a CCT selected from the range of 1500-8000 K.

14. The light generating system (1000) according to any one of the precedingclaims 1-12, wherein one of the following applies:2024PF80211 47 the light generating system (1000) comprises a Chip-on-Board (CoB) (600), wherein the Chip-on-Board (CoB) (600) 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); and the light generating system (1000) comprises a LED filament (400), wherein the LED filament (400) comprises (i) a plurality of the first solid state light source (10) arranged on an elongated carrier (5), and (ii) an elongated encapsulant (410) configured in physical contact with and covering the plurality of first solid state light sources (10) and at least part of the elongated carrier (5); wherein the elongated encapsulant (410) comprises the luminescent converter (2000).

15. A lighting device (1200) selected from the group of a lamp (1), a luminaire(2), a projector device (3), a disinfection device, a photochemical reactor, an automotive lighting device (4), a stage lighting device, and an optical wireless communication device, comprising the light generating system (1000) according to any one of the preceding claims.

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