Phosphor converted red LED light source comprising a converter with extra protected KSIF particles

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 light source light (11) having a first peak emission wavelength (λp1) selected from the range of 430-490 nm; (B) the luminescent converter (2000) is configured in a light receiving relationship with the first solid-state light source (10); wherein the luminescent converter (2000) comprises a first particulate luminescent material (2100), a second particulate luminescent material (2200), and a main matrix material (700); wherein the first particulate luminescent material (2100) and the second particulate luminescent material (2200) are configured embedded in the main matrix material (700); (C) the first particulate luminescent material (2100) comprises a first luminescent material (210) configured to convert light source light (11) received by the first luminescent material (210) into first luminescent material light (211) having a first centroid wavelength (λc1) selected from the range of 600-660 nm; (D) the second particulate luminescent material (2200) comprises (i) a second particulate matrix material (720) and (ii) primary particles (2300) comprising a second luminescent material (220), wherein the primary particles (2300) are configured embedded in the second particulate matrix material (720); wherein the second luminescent material (220) comprises a luminescent material of the type M'xM2-2xAX6 doped with tetravalent manganese, wherein M' comprises an alkaline earth cation, wherein M comprises an monovalent cation, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine (F); wherein the second luminescent material (220) is configured to convert light source light (11) received by the second luminescent material (220) into second luminescent material light (221) having a second centroid wavelength (λc2) selected from the range of 610-650 nm; (E) the first light generating device (110) is configured to generate first device light (111) comprising the first luminescent material light (211) and the second luminescent material light (221); and wherein the first device light (111) has a first device centroid wavelength (λcd,1) selected from the range of 610-660 nm.

Description

[0001]2024PF80279 1 PHOSPHOR CONVERTED RED LED LIGHT SOURCE COMPRISING A CONVERTER WITH EXTRA PROTECTED KSIF PARTICLES FIELD OF THE INVENTION The invention relates to a light generating system comprising a luminescent converter. The invention further relates to the luminescent converter. The invention further relates to a lighting device comprising said light generating system. BACKGROUND OF THE INVENTION Light generating systems are known in the art. For instance, US20240120448A1 describes a red-light emitting device comprising: a blue LED chip; and a photoluminescence material comprising a narrowband red fluoride phosphor and a broadband red phosphor. The narrowband red phosphor may comprise a manganese-activated fluoride phosphor of composition K2SiF6:Mn4+, K2GeF6:Mn4+, and K2TiF6:Mn4+. 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 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 light with a suitable color or color temperature. Prior art systems may make use of narrow-band fluoride red phosphors. However, due to their intrinsic hygroscopic nature, these phosphors may degrade over time due to contact with moisture, thereby reducing the lifetime of the light generating system and / or causing a change in optical properties of the system light over time. Further, prior art solutions may have problems with self-absorption in the phosphor layer, wherein light emitted by a first type of phosphor is absorbed by a second type of phosphor, thereby reducing the efficiency of the system and altering one or more of the correlated color temperature (CCT), color rendering index (CRI), and color point of the system light. As such, there appears to be a desire for light generating systems that may especially be efficient and have stable (moisture-resistant) spectral properties. Especially, it may be desired to provide a light generating system based on narrow-band fluoride red 2024PF80279 2 phosphors with high luminous efficiency, high color quality, and improved stability of the phosphor. To produce light with a suitable color temperature, the luminescent converter may comprise multiple types of phosphor, such as different types of red phosphor. One particularly interesting type of red phosphor is a “KSiF”-type red phosphor. However, such “KSiF”-type phosphors suffer from degradation due to light and moisture exposure, therewith reducing its reliability. Furthermore, there appears to be a desire to provide light with a high CRI and / or (early stage) tunable spectral power distributions. However, prior art solutionsmay have problems to provide high CRIs, efficient solutions, and / or stable solutions. Hence,it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. According to a first aspect, the invention provides a light generating system comprising a first light generating device. In embodiments, the first light generating device may comprise a first solid state light source and a luminescent converter. The first solid-state light source may be configured to generate light source light. In embodiments, the light source light may have a first peak emission wavelength (λp1) selected from the range of 430- 490 nm. Further, in embodiments, the luminescent converter may be configured in a light receiving relationship with the first solid-state light source. Hence, in embodiments, the luminescent converter may be configured downstream of the first solid state light source. In embodiments, the luminescent converter may comprise a first particulate luminescent material, a second particulate luminescent material, and a main matrix material. Especially, the first particulate luminescent material and the second particulate luminescent material may be configured embedded in the main matrix material. In embodiments, the first particulate luminescent material may comprise a first luminescent material configured to convert at least part of the light source light received by the first luminescent material into first luminescent material light. The first luminescent material light may especially have a first centroid wavelength (λc1) selected from the range of 600-660 nm. Moreover, in embodiments, the second particulate luminescent material may comprise (i) a second particulate matrix material and (ii) primary particles comprising a second luminescent material (different from the first luminescent material). Especially, the primary particles may be configured embedded in the second particulate matrix material. Moreover, in embodiments, the second particulate matrix material may be different from the main matrix material. The second luminescent material may, in embodiments, comprise a luminescent material of the type M’xM2-2xAX6 doped with 2024PF80279 3 tetravalent manganese. Especially, in embodiments, M’ may comprise an alkaline earth cation. More especially, M may comprise an monovalent cation (especially an alkaline cation). Further, in embodiments, A may comprise a tetravalent cation. Yet further, in embodiments, X may comprise a monovalent anion, at least comprising fluorine (F). In embodiments, the second luminescent material may be configured to convert at least part of the light source light received by the second luminescent material into second luminescent material light. The second luminescent material light may especially have a second centroid wavelength (λc2) selected from the range of 610-650 nm. Additionally, in embodiments, the second luminescent material light may have a second full width at half maximum (FWHM2) of ≤ 50 nm, such as ≤ 40 nm, especially ≤ 35 nm. In embodiments, the first light generating device may be configured to generate first device light comprising the first luminescent material light and the second luminescent material light. Especially, in embodiments, the first device light may have a first device centroid wavelength (λcd,1) selected from the range of 610-660 nm. Hence, in specific embodiments, the invention may provide a light generating system comprising a first light generating device, wherein the first light generating device may comprise a first solid state light source and a luminescent converter, wherein: (A) the first solid-state light source may be configured to generate light source light having a firstpeak emission wavelength (λp1) selected from the range of 430-490 nm; (B) the luminescentconverter may be configured in a light receiving relationship with the first solid-state light source; wherein the luminescent converter may comprise a first particulate luminescent material, a second particulate luminescent material, and a main matrix material; wherein the first particulate luminescent material and the second particulate luminescent material may be configured embedded in the main matrix material; (C) the first particulate luminescent material may comprise a first luminescent material configured to convert at least part of the light source light received by the first luminescent material into first luminescent material light having a first centroid wavelength (λc1), wherein the first centroid wavelength (λc1) may be selected from the range of 600-660 nm; (D) the second particulate luminescent material may comprise (i) a second particulate matrix material and (ii) primary particles comprising a second luminescent material (different from the first luminescent material), wherein the primary particles may be configured embedded in the second particulate matrix material; wherein the second particulate matrix material may be different from the main matrix material; wherein the second luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, wherein M comprises an monovalent cation (especially an alkaline cation), 2024PF80279 4 wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine (F); wherein the second luminescent material may be configured to convert at least part of the light source light received by the second luminescent material into second luminescent material light having a second centroid wavelength (λc2), wherein the second centroid wavelength (λc2) may be selected from the range of 610-650 nm; (E) the first light generating device may be configured to generate first device light comprising the first luminescent material light and the second luminescent material light; and wherein the first device light may have a first device centroid wavelength (λcd,1) selected from the range of 610-660 nm. Such a light generating system, wherein a first particulate material and a second particulate material may comprise different types of phosphors, may provide the benefit that the optical performance of a narrow band red phosphor and a broad band redphosphor may be combined. The reason is that with the introduction of narrow band (red)phosphor, such as KSiF, the light generating device, such as e.g. a LED, may be very efficient and may provide high quality light e.g. high red rendering. Further, embedding the (relatively) small primary particles in a second particulate matrix material comprised by second particulate luminescent material may provide first and second luminescent material particles having a roughly equal size. Such a configuration may provide a homogeneous distribution of the first and second luminescent material particles in the main matrix material, and therefore a homogeneous distribution of the first and second luminescent material. Further, the present solution may provide a relatively stable solution. Thus, such a light generating system may provide improved opticalperformance e.g. due to improved light quality, efficiency and / or reliability.The embodiments of the invention may further provide such a phosphor system (comprising both narrow band and broad band (red) phosphors) while providing maximum reliability of the phosphor through an improved moisture-resistance (thus improved lifetime) and improved dispersing properties in the matrix material (e.g. sedimentation and / or phosphor clustering). Hence, the light generating system may provide a compromise of high quality light together with improved stability of the phosphor (and thus the system). Moreover, the herein applied materials may be non-reactive, stable and resistant to both extreme temperatures and (blue) high light intensities. Hence, the invention may provide a phosphor converted red LED light source comprising a converter with extra protected KSiF particles. 2024PF80279 5 The light generating system (or “system”) may thus comprise a first light generating device. The first light generating device may especially comprise a first solid state light source and a luminescent converter. Here below, embodiments of the different elements of the first light generating device will be described in further detail. In embodiments, the second particulate luminescent material comprises N second luminescent material particles, wherein N may be at least 100 or at least 500 or at least 1000 such as at least 5000 or at least 10000. In embodiments, the second particulate luminescent material comprises second luminescent material particles, wherein each second luminescent material particle comprisesM primary particles, wherein M may be at least 5 or at least 10 or at least 15 such as at least20 or at least 25. In embodiments, the first particulate luminescent material comprises O first luminescent material particles, wherein O may be at least 100 or at least 500 or at least 1000 such as at least 5000 or at least 10000. In embodiments, the first light generating device may comprise a first solid state light source. The (first) solid state light source may be any solid state light source known in the art (see below). Especially, the (first) solid state light source may be a (single) light emitting diode (LED). Alternatively, the (first) solid state light source may be selected from the group of a laser diode, a superluminescent diode, and a multi-junction light emitting diode. In embodiments, the (first) solid state light source may especially comprise one or more light emitting diodes. Especially, in embodiments, the (first) solid state light source may comprise a plurality of light emitting diodes. Hence, in specific embodiments, the (first) solid state light source may be selected from the group of a light emitting diode, a laser diode, a superluminescent diode, and a multi-junction light emitting diode. Such a solid state light source may be relatively small. Further, such a solid state light source may be relatively energy-efficient and / or provide relatively high-intensity light. 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 380-490 nm, such as from the range of 400-490 nm, especially from the range of 420-490 nm, like from the range of 430-490 nm. Hence, the first light source light may be violet light or blue light. The term “violet light”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. The term“blue light”, and similar terms, may especially relate to light having a wavelength in therange of about 440-490 nm. The term “peak wavelength” may refer to the wavelength where 2024PF80279 6 the radiometric emission spectrum of the light source reaches its maximum, i.e., the peak wavelength may denote the wavelength at which the largest (emission intensity) value is found in a graph of the spectral power distribution. The peak wavelength may especially be determined at room temperature. The light generating system, especially the first light generating device, may further comprise a luminescent converter. The luminescent converter may be configured in physical contact and covering (a light escape surface of) the one or more solid-state lightsources. That is, the luminescent converter may be configured as a coating. Hence, in specificembodiments, the luminescent converter may be configured as a coating, wherein the luminescent converter may be configured covering and in physical contact with the one or more solid-state light sources. Configuring the luminescent converter as a coating may improve the efficiency with which the light source light is coupled into the luminescent converter, as the light source light may be (essentially) not be refracted at a first interface between the one or more solid-state light sources and air, and at a second interface 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 one or more solid-state light sources, or (ii) at a non-zero distance d1 from (the light escape surfaces of) the one or more solid-state light sources. The non-zero distance d1 may 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 d1may 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 one or more solid-state light sources. In embodiments, the luminescent converter may especially be configured in a light receiving relationship with the first solid state light source. Hence, the luminescent converter may be configured downstream from the first solid state light source. The terms“upstream” and “downstream” relate to an arrangement of items or features relative to thepropagation 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”. Hence, in specific embodiments, the luminescent converter may be configured downstream from the first solid state light source. Especially, in 2024PF80279 7 embodiments, the luminescent converter may be configured in physical contact with the first solid state light source. The luminescent material may especially comprise a luminescent material. The term “luminescent material” may refer to a material that can convert first radiation, especially one or more of UV radiation and blue radiation, into second radiation. Herein, UV (ultraviolet) may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm, though other wavelengths may also be possible. In general, the first radiation and second radiation have different spectral power distributions, with the second radiation having a spectral power distribution at larger wavelengths than the first radiation (i.e. “down-conversion”). In embodiments, the term “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, infrared (IR) may refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength up to about 1500 nm, though in specific embodiments other wavelengths may also be possible. For instance, in embodiments the (first and second, see also further below) luminescent material may be able to convert one or more of UV radiation and blue 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. The luminescent converter may especially comprise a first particulate luminescent material and a second particulate luminescent material. Furthermore, in embodiments, the luminescent converter may comprise a matrix material (see also further 2024PF80279 8 below). The first particulate luminescent material may especially be configured embedded in the matrix material. Similarly, the second particulate luminescent material may especially be configured embedded in the matrix material. Such a configuration may provide a homogeneous distribution of the first and second particulate luminescent material in the main matrix material, and therefore a homogeneous distribution of the first and second luminescent material. In embodiments, the first particulate luminescent material may comprise a first luminescent material. The first luminescent material may especially be configured to convertat least part of the light source light received by the first luminescent material into firstluminescent material light. Especially, the first luminescent material may be configured to convert ≥ 50%, such as ≥ 60%, especially ≥ 70%, of (a spectral power of) the 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 light source light received by the first luminescent material into first luminescent material 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 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. 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. Additionally, in embodiments, the first luminescent material light may have a first full width at half maximum (FWHM1) of ≥ 60 nm, such as ≥ 70 nm, especially ≥ 80 nm. 2024PF80279 9 Conversely, in embodiments, the second particulate luminescent material may comprise a second particulate matrix material and primary particles. The primary particles may especially be configured embedded in the second particulate matrix material. In embodiments, the second particulate matrix material may especially be different from the main matrix material, see also further below. Further, in embodiments, the primary particles may comprise a second luminescent material. The second luminescent material may especially be different from the first luminescent material. For example, in embodiments, the first luminescent material and the second luminescent material may comprise a different type of phosphor, see also further below. In embodiments, the second luminescent material may be configured to convert at least part of the light source light received by the second luminescent material into second luminescent material light. Especially, the second luminescent material may be configured to convert ≥ 50%, such as ≥ 60%, especially ≥ 70%, of (a spectral power of) the light source light received by the second luminescent material into second luminescent material light. Further, the second luminescent material may be configured to convert ≥ 80%, such as ≥ 90%, especially ≥ 95%, like ≥ 98%, including (essentially) 100%, of (a spectral power of) the 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). In embodiments, the second centroid wavelength (λc2) 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 second luminescent material light may comprise, such as be, one or more of orange light and red light, such as especially red light. Further, the second luminescent material light may comprise at least one emission band having a (second) full width at half maximum FWHM2 of ≤ 65 nm, such as ≤ 55 nm, especially ≤ 40 nm. Further, the second luminescent material light may comprise atleast one emission band having a full width at half maximum FWHM2 of ≤ 35 nm, such as ≤30 nm, especially ≤ 25 nm. Additionally or alternatively, the second luminescent material light may comprise the at least one emission band having a full width at half maximum FWHM2 of ≥ 2 nm, such as ≥ 5 nm, especially ≥ 7 nm. In embodiments, the second luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the full width at half maximum FWHM2. Additionally or alternatively, the 2024PF80279 10 second luminescent material light may comprise a plurality of emission bands, wherein essentially all of the emission bands may have the full width at half maximum FWHM2. 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. Hence, in embodiments the second luminescent material light may have a second centroid wavelength (λc2) selected from the wavelength range of 610-650 nm, and may comprise one or more emission bands having a full width half maximum (FWHM2) of at maximum 50 nm. Such conditions may especially apply for luminescent materials of the type M’xM2-2xAX6doped with tetravalent manganese. Hence, in embodiments, the second luminescent material may comprise a tetravalent manganese-comprising luminescent material, i.e., a luminescent material doped with tetravalent manganese. Especially, in embodiments, the second 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 a monovalent 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”, whether or not M comprises K or one or more other (alkaline) cations. A luminescent material of the type M’xM2-2xAX6doped 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 monovalent 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). Hence, in embodiments, M may comprise one or more of K, Rb, Li, Na, Cs, and NH4+. 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 2024PF80279 11 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’xM2-2xAX6luminescent material has the cubic phase. In an embodiment, a combination of different alkaline cations M may be applied. In yet another embodiment, a combination of different alkaline earth cations M’ may be applied. In yet another embodiment, a combination of one or more alkaline cations M and one or more alkaline earth cations M’ may be applied. For instance, KRb0.5Sr0.25AX6might 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’xM2-2xAX6 doped 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 therange of 0.01-0.12. As manganese replaces part of a host lattice ion and has a specificfunction, 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 preferablyat least 90%, such as at least 95% of A consists of silicon. In a specific embodiment, M’xM2-2xAX6can also be described as (K1-r-l-n-c-nhRbrLilNanCsc(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. 2024PF80279 12 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’xM2-2xAX6can also be described as M’xM2-2xA(F1-cl-b-iClclBrbIi)6, wherein cl,b,i are each individually preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05, and wherein cl+b+i < 1, especially ≤ 0.2,preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in therange of 0-0.05. Hence, M’xM2-2xAX6can also be described as (K1-r-l-n-c-nhRbrLilNanCsc(NH4)nh)2Si1-m-t-g-s-zrMnmTitGegSnsZrzr(F1-cl-b-iClclBrbIi)6, with the values for r,l,n,c,nh,m,t,g,s,zr,cl,b,i as indicated above. In an embodiment, M’xM2-2xAX6 comprises K2SiF6 (indicated herein also as KSiF system). In another preferred embodiment, M’xM2-2xAX6 comprises KRbSiF6 (herein also indicated as K,Rb system). In specific embodiments, the indication M’xM2-2xAX6 may refer to one or more of (K,Rb)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 second 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 M, or A) in chemical formulas refer to n different elements, this may imply that the relevant formula may comprise for the M’ (or 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, 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+, Rb2SiF6:Mn4+, and (KxRby)2SiF6:Mn4+, etc.. 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+, Rb2SiF6:Mn4+, or (KxRby)2SiF6:Mn4+. Also herein in general x+y=1. Hence, when M’ (or M, or A) may refer to n different elements, with n being at least two, 2n-1 permutations may in principle be possible. As indicated above, the second particulate material, especially the primary particles, may comprise a second luminescent material. In embodiments, the second 2024PF80279 13 luminescent material may be selected from any of the luminescent materials provided above. Especially, the second luminescent material may comprise a luminescent material of the type of tetravalent manganese doped luminescent materials. Even more especially, the second luminescent material may comprise (such as consist of) a luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese, wherein (i) M’ comprises an alkaline earth cation, (ii) M comprises a(n alkaline) cation, (iii) A comprises a tetravalent cation, comprising one or more of silicon and titanium, (iv) X comprises a monovalent anion, such as one or more of fluorine, chlorine, bromine, and iodine, wherein X at least comprises fluorine, and (v) x is in the range of 0-1 (see also above). In embodiments, as indicated above, a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese may be referred to as a KSiF phosphor. Hence, in embodiments, the invention may provide a light generating system using KSiF phosphor particles as converter. Conversely, in embodiments, the first luminescent material may comprise a luminescent material selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively. However, other types of luminescent materials are herein not excluded. The term “nitride” may also refer to oxynitride or nitridosilicate, etc. Alternatively or additionally, the first luminescent material may comprise a luminescent material selected from silicates, especially doped with divalent europium. In embodiments, the first luminescent material may comprise a divalent europium comprising oxynitride luminescent material. Further, in embodiments, the first luminescent material may comprise a divalent europium comprising nitride luminescent material. In specific embodiments, the first luminescent material may be selected from a divalent europium comprising oxynitride luminescent material and a divalent europium comprising nitride luminescent material. In embodiments, the first luminescent material and the second luminescent material may thus be different luminescent materials. Moreover, in embodiments, the first luminescent material light and the second luminescent material light may have a different centroid wavelength. Especially, in embodiments, |λc2-λc1|≥5 nm, such as |λc2-λc1|≥10 nm, like|λc2-λc1|≥15 nm, especially |λc2-λc1|≥20 nm. Further, in embodiments, |λc2-λc1|≤50 nm, such as|λc2-λc1|≤40 nm, like |λc2-λc1|≤35 nm, especially |λc2-λc1|≤25 nm. Especially, in embodiments, the second centroid wavelength may be relatively larger than the first centroid wavelength. Hence, in such embodiments, λc1+5 nm≤ λc2, such as λc1+10 nm≤ λc2, like λc1+15 nm≤ λc2. Moreover, in such embodiments, λc1+450 nm≤ λc2, such as λc1+30 nm≤ λc2, like λc1+20 nm≤ λc2. Hence, in specific embodiments, one or more of the following applies: |λc2-λc1|≥10 nm and λc1+10 nm≤ λc2. 2024PF80279 14 The first light generating device may thus comprise a first particulate luminescent material and a second particulate luminescent material. In embodiments, the first light generating device may be configured to generate first device light. Especially, in embodiments, the first device light may comprise the first luminescent material light and the second luminescent material light. The first device light may especially have a first device light centroid wavelength (λcd,1). In embodiments, the first device light centroid wavelength (λcd,1) may be selected from the wavelength 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 device light may comprise, such as be, one or more of orange light and red light, such as especially red light. As described above, the first luminescent material may be comprised by a first particulate luminescent material. In embodiments, the first particulate luminescent material may comprise three-dimensional particles having dimensions (first) length (L1), (first) width (W1), and (first) height (H1). In embodiments, the first length (L1) may be defined as equal to or larger than the first width (W1) and larger than first height (H1), i.e. the first length (L1) may especially be the largest dimension. Further, in embodiments, the first particulate luminescent material may have a first number averaged equivalent circular diameter (D1). The equivalent spherical diameter (or ESD) of an (irregularly) shaped object is the diameter of a sphere of equivalent volume. Hence, the equivalent spherical diameter (ESD) of a cubewith a side a is 2 ∗ ^ ∗^^3 / (4 ∗ π). Would a sphere in an xyz-coordinate system with a diameter D be distorted to any other shape (in the xyz-plane), without changing the volume, than the equivalent spherical diameter of that shape would be D. The equivalent circular diameter (or ECD) (or “circular equivalent diameter”) of an (irregularly shaped) two- dimensional shape is the diameter of a circle of equivalent area. For instance, the equivalent circular diameter of a square with side a is 2a / (SQRT(π)). For a circle, the diameter D is the same as the equivalent circular diameter D. Would a circle in an xy-plane with a diameter D be distorted to any other shape (in the xy-plane), without changing the area size, then the equivalent circular diameter of that shape would be D. In embodiments, the first number averaged equivalent circular diameter (D1) may be determined by dividing the sum of the first equivalent circular diameters of all first particulate luminescent material particles in the luminescent converter by the number of said first particulate luminescent material particles, i.e. for a luminescent converter comprising N first particulate luminescent material particles, the first number averaged equivalent circular diameter (D1) may be provided by∑^ ^^. 2024PF80279 15 In embodiments, the first number averaged equivalent circular diameter (D1) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Additionally or alternatively, the first length (L1) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Further, the first width (W1) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Further still, in embodiments, the first height (H1) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Hence, in embodiments, the first number averaged equivalent circular diameter (D1), the first length (L1), the first width (W1), and the first height (H1) may be individually selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. In embodiments wherein L1 = W1 = H1, the first particulate luminescent material particles may comprise a (substantially) spherical shape. Further, in embodiments, the first number averaged equivalent circular diameter (D1), the first length (L1), the first width (W1), and the first height (H1) may for each of the first particulate material particles be individually selected from the range of 5-50 µm. In embodiments, the first length (L1) and first width (W1) may define a first aspect ratio AR1 of the first particulate luminescent material particles. Especially, the first aspect ratio AR1may be provided by AR1= L1 / W1. In embodiments, the first aspect ratio AR1 may be selected from the range of 1-3, such as from the range of 1-2.5, especially from the range of 1-2. In embodiments, the second particulate luminescent material may similarly comprise three-dimensional particles having dimensions (second) length (L2), (second) width (W2), and (second) height (H2). Further, in embodiments, the second particulate material may have a second number averaged equivalent circular diameter (D2). In embodiments, thesecond number averaged equivalent circular diameter (D2) may be selected from the range of5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Additionally or alternatively, the second length (L2) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Further, the second width (W2) may be selected from the range of 5-50 µm, such as from the range of 7- 45 µm, especially from the range of 10-40 µm. Further still, in embodiments, the second height (H2) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Hence, in embodiments, the second number averaged equivalent circular diameter (D2), the second length (L2), the second width (W2), and the second height (H2) may be individually selected from the range of 5-50 µm, such as from the 2024PF80279 16 range of 7-45 µm, especially from the range of 10-40 µm. In embodiments wherein L2= W2= H2, the second particulate material particles may especially comprise a spherical shape. Further, in embodiments, the second number averaged equivalent circular diameter (D2), the second length (L2), the second width (W2), and the second height (H2) may for each of the second luminescent material particles be individually selected from the range of 5-50 µm. In embodiments, the second length (L2) and second width (W2) may define a second aspect ratio AR2 of the second particulate material particles. In embodiments, the second aspect ratio AR2 may be selected from the range of 1-15, such as from the range of 1-10, especially from the range of 1-5. In embodiments wherein AR2≥ 2 or AR2≥ 3, the second particulate material particles may especially have an elongated shape. In embodiments, the primary particles may similarly comprise three- dimensional particles having dimensions (third) length (L3), (third) width (W3), and (third) height (H3). Further, in embodiments, the primary particles may have a third number averaged equivalent circular diameter (D3). In embodiments, the third number averagedequivalent circular diameter (D3) may be selected from the range of 5-50 µm, such as fromthe range of 7-45 µm, especially from the range of 10-40 µm. Additionally or alternatively, the third length (L3) may be selected from the range of 5-50 µm, such as from the range of 7- 45 µm, especially from the range of 10-40 µm. Further, the third width (W3) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Further still, in embodiments, the third height (H3) may be selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. Hence, in embodiments, the third number averaged equivalent circular diameter (D3), the third length (L3), the third width (W3), and the third height (H3) may be individually selected from the range of 5-50 µm, such as from the range of 7-45 µm, especially from the range of 10-40 µm. In embodiments wherein L3= W3= H3, the primary particles may especially comprise a spherical shape. Further, in embodiments, the third number averaged equivalent circular diameter (D3), the third length (L3), the third width (W3), and the third height (H3) may for each of the primary particles be individually selected from the range of 5-50 µm. In embodiments, the primary particles may be smaller than the first particulate luminescent material particles, i.e., D3 / D1 ≤ 1, such as D3 / D1 ≤ 0.9, like D3 / D1 ≤ 0.7. Additionally, in embodiments, the primary particles may be smaller than the second particulate luminescent material particles, i.e. D3 / D2 ≤ 1, such as D3 / D2 ≤ 0.9, like D3 / D2 ≤ 0.7. Especially, in embodiments, D3 ≤ 0.7*D2 and D3 ≤ 0.7*D1, such as D3 ≤ 0.5*D2 and D3 ≤ 0.5*D1, like D3 ≤ 0.3*D2 and D3 ≤ 0.3*D1, especially D3 ≤ 0.2*D2 and D3 ≤ 0.2*D1. 2024PF80279 17 Further, in embodiments, the first particulate luminescent material and the second particulate luminescent material may be about equal in size. Especially, in embodiments, 0.2 ≤ D2 / D1 ≤ 5, such as 0.3 ≤ D2 / D1 ≤ 3.5, especially 0.5 ≤ D2 / D1 ≤ 2, more especially 0.8 ≤ D2 / D1 ≤ 1.2. Hence, in specific embodiments, the first particulate luminescent material has a first number averaged equivalent circular diameter (D1), the second particulate luminescent material has a second number averaged equivalent circular diameter (D2), and 0.5 ≤ D2 / D1 ≤ 2. Such a size ratio between the first particulate luminescent material particles and the second particulate luminescent material particles may facilitate an even mixing of the luminescent material particles. Further, such a size ratio may facilitate a homogeneous dispersion of luminescent material particles in the luminescent body. Particle sizes may be determined with methods known in the art, like one or more of optical microscopy, SEM (scanning electron microscope) and TEM (transmission electron microscopy). Dimensions may be number averaged, as known in the art. Hence, the particles may be substantially identical, but the particles may also mutually differ, such as two or more subsets of particles, wherein within the subsets the particles are substantially identical. The particles may have a unimodal particle size distribution or a polymodal size distribution. From measured dimension, equivalent diameters may be determined. As indicated, the first particulate luminescent material may be configured embedded in the main matrix material. In embodiments, the main matrix material may thus comprise the first particulate luminescent material. Especially, the main matrix material may comprise the first particulate luminescent material in a first luminescent material particles concentration C1. Here, the concentration C1may especially refer to a v / v% concentration of (the volume of the) first particulate luminescent material particles relative to a first volume V1. In embodiments, the first volume V1may be the combined volume of (i) the main matrix material, (ii) the first particulate luminescent material, and (iii) the second particulate luminescent material ((iv) and optionally a light scattering material, see also further below). In embodiments, the first volume V1 may essentially be equal to the volume of the luminescent converter. Yet, in embodiments, the first volume V1may be smaller than the volume of the luminescent converter, e.g. when the luminescent converter comprises a support. In embodiments, the main matrix material may thus comprise the first particulate luminescent material in a first luminescent particle concentration C1. In embodiments, the first luminescent particle concentration C1 may be selected from the range of 0.1-35% (v / v%), such as from the range of 0.5-30% (v / v%), especially from the range of 1-25% (v / v%) (relative to the first volume V1). Further, in embodiments, the first luminescent 2024PF80279 18 particle concentration C1may be selected from the range of 2-20% (v / v%), such as from the range of 3-18% (v / v%), especially from the range of 4-15% (v / v%) (relative to the first volume V1). Further, in embodiments, the main matrix material may comprise the second particulate luminescent material in a second luminescent material particle concentration C2(relative to the first volume V1). In embodiments, the second luminescent material particle concentration C2 may be equal to the first luminescent particle concentration C1, C2 = C1. Further, in embodiments, the second luminescent material particle concentration C2may differ from the first luminescent particle concentration C1, such as 0.25*C1≤ C2≤ 4*C1, especially 0.3*C1 ≤ C2 ≤ 3*C1, more especially 0.5*C1 ≤ C2 ≤ 2*C1. Especially, in embodiments, the second luminescent material particle concentration C2may be higher than the first luminescent particle concentration C1, such as C2 ≥ 1.25*C1, like C2 ≥ 1.5*C1, especially C2 ≥ 1.75*C1, more especially C2 ≥ 2*C1. Further, in embodiments, C2 ≤ 3.5*C1, such as C2 ≤ 3.25*C1, especially C2 ≤ 3*C1. Additionally or alternatively, in embodiments, the second luminescent particle concentration C2may be selected from the range of 0.1-40 vol. %, such as from the range of 0.5-30 vol. %, especially from the range of 1-25 vol. % (relative to the first volume V1). Especially, in embodiments, the second luminescent particle concentration C2may be selected from the range of 4-40 vol. %, such as from the range of 5- 30 vol. %, especially from the range of 6-25 vol. % (relative to the first volume V1). Further, in embodiments, the main matrix material may comprise the first particulate luminescent material particles and the second particulate luminescent material particles in a (combined) luminescent material particle concentration C1+2(relative to the first volume V1). In embodiments, the (combined) luminescent material particle concentration C1+2may be selected from the range of 1-60 vol. %, such as from the range of 2-40 vol. %, especially from the range of 3-30 vol. % (relative to the first volume V1). In embodiments, the second particulate luminescent material particles may comprise the primary particles. In embodiments, the primary particles may have a primary particle concentration Cpwithin the second particulate luminescent material particles. Especially, the second particulate luminescent material particles may comprise the primary particles in a primary particle concentration Cp, wherein the primary particle concentration Cp may especially refer to a v / v% concentration of (the volume of) the primary particles relative to the total volume of the second particulate luminescent material particles. In embodiments, the primary particle concentration Cp may be selected from the range of 2-60 vol. % , such as from the range of 5-50 vol. %, especially from the range of 10-40 vol. % (relative to the 2024PF80279 19 volume of the second particulate luminescent material particles). In embodiments, the primary particle concentration Cpmay be higher than the (combined) luminescent particle concentration C1+2, i.e. the concentration of primary particles in the second particulate luminescent material particles may be higher than the (combined) concentration of first particulate luminescent material particles and second particulate luminescent material particles in the main matrix material. Especially, in embodiments, Cp ≥ C1+2, such as Cp ≥ 2*C1+2, especially Cp ≥ 3*C1+2. Further, in embodiments, Cp ≤ 15*C1+2, such as Cp ≤ 12*C1+2, especially Cp≤ 10*C1+2. Hence, in specific embodiments, the second particulate luminescent material may comprise primary particles in a primary particle concentration (Cp) selected from the range of 10-40 vol.%; the main matrix material may comprise the first particulate luminescent material in a first luminescent material particle concentration (C1), and the second particulate luminescent material in a second luminescent material particle concentration (C2); a luminescent material particle concentration (C1+2) may be selected from the range of 3-30 vol. %; and C2≥ 2*C1and Cp≥ Cl+2.Such concentrations of primary particles, first particulate luminescent material particles, and second particulate luminescent material particles may facilitate distributing the absorption of (light source) light over a relatively large optical path length. Hence, such a luminescent converter may provide thermal management. Further, a (combined) luminescent material particle concentration C1+2 selected from the range of 3-30 vol. % may facilitate outcoupling of (unconverted) light source light. In embodiments wherein the light source light comprises blue light, such a luminescent converter may facilitate the outcoupling of white light. In embodiments, the main matrix material may comprise an optically transparent material. Herein, the term “optically transparent” material indicates the material may be transmissive for one or more wavelengths selected from the range of 190-1500 nm, such as for one or more wavelengths selected from the range of 200-1000 nm, especially for one or more wavelengths selected from the range of 380-780 nm. In embodiments, the mainmatrix material may comprise an optically transparent (crosslinked) polymeric material.Especially, the main matrix material may comprise a material selected from the group comprising glass, polycarbonate (PC), (clear) polyvinyl chloride (PVC), liquid silicone rubber (LSR), cyclic olefin copolymers (COC), fluorinated ethylene propylene (FEP), styrene methyl methacrylate (SMMA), polysiloxanes, and poly(methyl methacrylate) (PMMA), orcombinations thereof. In embodiments, the main matrix material may thus comprise acrosslinked polysiloxane, such as selected from the group comprising polydimethylsiloxane 2024PF80279 20 (PDMS), polymethylphenylsiloxane (PMPS), and polydiphenylsiloxane (PDPS), especially PDMS, or combinations thereof. Further, in embodiments, the second particulate matrix material may comprise an optically transparent material. In embodiments, the second particulate matrix material maycomprise a sol-gel particle matrix. The term “sol-gel particle” is known to a person skilled inthe art, and may refer to a particle created using the sol-gel method. Further, in embodiments, the particulate particle matrix material may comprise an optically transparent (crosslinked) polymeric material. Especially, the second particulate matrix material may comprise a material selected from the group comprising glass, PC, (clear) PVC, LSR, COC, FEP, SMMA, polysiloxanes, and PMMA. Especially, in embodiments, the second particulate matrix material may comprise a crosslinked polysiloxane. Hence, in specific embodiments, one or more of the main matrix material and the second particulate matrix material may comprise a crosslinked polysiloxane. Moreover, in specific embodiments, one or more of the main matrix material and the second particulate matrix material may comprise one or more of crosslinked PDMS, crosslinked PDPS, crosslinked PMPS, and a copolymer of two or more of the afore-mentioned. Crosslinked polysiloxanes may provide thermal stability, and may therefore not degrade or react under operating conditions of a light generating system. Further, crosslinked polysiloxanes may provide long term optical transparency, and may not discolor under (high-intensity) irradiation with light. Additionally, crosslinked polysiloxanes may facilitate shaping of the luminescent body into a variety of shapes, using suitable molds. Further, in embodiments, the main matrix material (and optionally the second particulate matrix material) may comprise a light scattering material. Especially, the main matrix material may comprise a material selected from the group comprising BaSO4, Al2O3 and TiO2particles. More especially, in embodiments, a light scattering material selected from the group comprising BaSO4, Al2O3and TiO2particles may be configured embedded in the main matrix material. Especially, the main matrix material may comprise the light scattering material l in a light scattering material concentration Cs. Here, the concentration Cs may especially refer to a v / v% concentration of (the volume of the) light scattering material particles relative to the first volume V1. In embodiments, the light scattering material concentration Cs may be selected from the range of 0.1-50 vol. %, such as from the range of 0.5-40 vol. %, especially from the range of 5-35 vol. % (relative to the first volume V1). Further, in embodiments, the first luminescent particle concentration C1 may be selected from the range of 2-40 vol. %, such as from the range of 3-30 vol. %, especially from the range of 4-20 vol. % (relative to the first volume V1). Hence, in specific embodiments, the main 2024PF80279 21 matrix material may comprise a light scattering material selected from the group comprising BaSO4, Al2O3and TiO2particles embedded in the main matrix material; wherein the main matrix material may comprise the light scattering material selected from the range of 5-35 vol. %. The light scattering material may be configured to scatter (or “diffuse”) the light source light and / or the first (and / or second) luminescent material light. Yet further, in embodiments, the main matrix material may have a main water permeability (d1). The water permeability may herein be defined as the number of liters of water that pass through a 1 m2area of matrix material per hour under a pressure head of 1 bar (i.e. unit L / m2hbar). Similarly, in embodiments, the second particulate matrix material may have a second water permeability (d2). In embodiments, the second particulate matrix material may have a lower water permeability than the main matrix material. Especially, inembodiments, d2≤0.9*d1, such as d2≤0.8*d1, like d2≤0.7*d1, especially d2≤0.5*d1.Moreover, in embodiments, d2≤0.1*d1, such as d2≤0.2*d1, like d2≤0.1*d3. Therefore, in embodiments, the second particulate matrix material and the main matrix material may especially be different. Especially, in embodiments, the second particulate matrix material may comprise a fluorinated polymer. Such embodiments may provide the benefit that a fluorinated polymer may lower the water permeability in the matrix material, therewith improving the moisture resistance (and thus lifespan) of the second particulate luminescent material. For example, in embodiments, the second particulate matrix material may comprise a fluorinated crosslinked silicone. Especially, in embodiments, the second particulate matrix material may comprise one or more polymers selected from the group comprising: tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride, or copolymers thereof. As indicated above, the luminescent converter may be configured downstream from the first solid-state light source. 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 light source light may be incident on the first major face of the luminescent converter, and the first luminescent material light (and optionally transmitted light source light) may exit the luminescent converter via the second major face. Especially, in embodiments, the luminescent converter may be configured to convert at least 80%, such as at least 90%, like at least 95%, especially at least 98% of the light source light received by the luminescent converter into first luminescent material light and / or second luminescent material light. Hence, in such embodiments, the luminescent converter may be 2024PF80279 22 configured to transmit (or reflect or absorb) at most 20%, such as at most 10%, like at most 5%, especially at most 2% of the light source light received by the luminescent converter as unconverted light source light. Especially, in embodiments, the luminescent converter may be configured in a full conversion mode (i.e. essentially all of the light source light received by the luminescent converter may be converted into luminescent material light). Additionally or alternatively, in embodiments, the light generating system may further comprise a dichroic reflector configured downstream of the luminescent converter. In such embodiments, the dichroic reflector may be configured to transmit at least part of the first luminescent material light and at least part of the second luminescent material light received by the dichroic reflector. Additionally or alternatively, in such embodiments, the dichroic reflector may be configured to reflect at least part of the light source light received by the dichroic reflector back to the luminescent converter. Hence, the dichroic reflector may be configured to separate the luminescent material light from the light source light. The light source light may especially be reflected back to the luminescent converter, which may convert the (remaining) light source light into luminescent material light. Thus, such embodiments may provide the benefit that a higher efficiency of the luminescent converter in the light generating system may be achieved. Hence, in embodiments, one or more of the following may apply: (A) the luminescent converter may be configured to convert at least 98% of the light source light received by the luminescent converter into first luminescent material light and / or second luminescent material light; and (B) the light generating system may comprise a dichroic reflector configured downstream of the luminescent converter, wherein the dichroic reflector may be configured to (i) transmit at least part of the first luminescent material light and at least part of the second luminescent material light received by the dichroic reflector, and to (ii) reflect at least part of the light source light received by the dichroic reflector back to the luminescent converter. In embodiments, the dichroic reflector may essentially comprise a spectral filter, such as e.g. a high-pass spectral filter, a low-pass spectral filter, or a combination thereof (also referred to as a band-pass or band-block filter). 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 2024PF80279 23 applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generatingsystem (or luminaire) may be part of or may be applied in e.g. optical communicationsystems or disinfection systems. In embodiments, the light generating system may be configured to provide, in an operational mode, white system light. Especially, in such embodiments, the system light, more especially the first device light, may comprise first luminescent material light, second luminescent material light, and light source light. Furthermore, in such embodiments, the system light may have a color rendering index of at least 80, and a correlated color temperature selected from the range of 1500-6500 K. 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 2700- 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700 K and 6500 K. In embodiments, e.g. for backlighting purposes, or for other purposes, the correlated color temperature (CCT) may especially be in the range of about 7000 K and 20000 K. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL. In specific embodiments, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, like at least 8000 K. Yet further, in embodiments the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, in combination with a CRI of at least 70. The light generating system may especially be configured to generate system light. The system light may essentially consist of the first device light in embodiments wherein there are no further sources of light. However, the system may also comprise further sources or light. Hence, in embodiments, the system light may comprise first device light and / or light of one or more other sources of light, like one or more further light generating devices. In embodiments, the light generating system may comprise a Chip-on-Board (CoB). The Chip-on-Board may comprise a plurality of the solid-state light sources. 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 2024PF80279 24 solid-state light sources, wherein first solid-state light sources may especially be LEDs. 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 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 solid-state light sources, and (ii) the luminescent converter, wherein the luminescent converter may be configured on top of the plurality ofsolid-state light sources. A light generating system comprising a CoB may be relativelycompact, 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. In yet other embodiments, the COB may comprise first (solid-state) light sources, second (solid-state) light sources, and optionally further (solid-state) light sources, wherein the types of (solid-state) light sources differ in peak emission wavelengths (with in specific embodiments at least about 5 nm difference, more especially at least about 10 nm). This may allow providing peak emission wavelengths in different wavelength ranges. 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. 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 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 2024PF80279 25 transmissive, translucent, or transparent for light, especially visible light. Alternatively, the carrier may be light reflective, especially reflective for one or more of the light source light and the first (and / or second) luminescent material light, such as reflective for at least the 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, oppositeto the first side. The solid-state light sources may be arranged on at least one of thesesurfaces. 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. 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 2024PF80279 26 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 ofsolid-state light sources in the array, such as at least 75%, especially at least 95%, up to100%. 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 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 solid-state light sources arranged on an elongated carrier. Further, the LED filament may comprise an elongated encapsulantconfigured in physical contact with and covering (such as at least partially enclosing) theplurality 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 solid-state light sources arranged on an elongated carrier, and (ii) an elongated encapsulant configured in physical contact with and covering the plurality of solid-state light sources and at least part of the elongated carrier; wherein the elongated encapsulant may comprise the luminescent 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. In embodiments, the LED filament may comprise a single type of solid-state light source (which may be indicated as first solid-state light source). In yet other embodiments, the LED filament may comprise first solid-state light sources, second solid-state light sources, and optionally further solid-state light sources, wherein the types of solid- 2024PF80279 27 state light sources differ in peak emission wavelengths (with in specific embodiments at least about 5 nm difference, more especially at least about 10 nm). This may allow providing peak emission wavelengths in different wavelength ranges. 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 sone or more solid-state light sources 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 one or more solid-state light sources. 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 ase.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 primaryradiation, 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 yet other embodiments, the first light generating device of the light package may comprise first solid-state light sources, second solid-state light sources, and optionally further solid-state light sources, wherein the types of solid-state light sources differ in peak emission wavelengths (with in specific embodiments at least about 5 nm, more especially at least about 10 nm). This may allow providing peak emission wavelengths in different 2024PF80279 28 wavelength ranges. The solid-state light source(s) of the first light generating device in the light package (comprising in specific embodiments multiple sub-packages) may herein also be indicated as primary solid-state light sources. 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 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. The second light generating device may comprise a secondary solid-state light source. The secondary 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 e.g. above). Further, the secondary solid-state light source may be configured to generate secondary light source light. The secondary 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. Hence, the secondary light source light may be one or more of violet light and blue light, such as especially blue light. Further, the second light generating device may comprise a second luminescent converter. The second luminescent converter may be configured as a coating on (top of) the secondary 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 secondary 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 secondary light source light received by the third luminescent material into 2024PF80279 29 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 may comprise, such as be, one or more of green light and yellow light (including some blue and 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 secondary 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). Hence, in specific embodiments, the secondary solid-state light source may be configured to generate secondary light source light having a second peak 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 secondary 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 secondary 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 tertiary solid- state light source. The tertiary 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 (seeabove). Further, the tertiary solid-state light source may be configured to generate tertiary 2024PF80279 30 light source light. The tertiary light source light may especially have a third peak emission wavelength (λp3) selected from the range of 360-500 nm, such as from the range of 380-490 nm, especially from the range of 420-490 nm. Hence, the tertiary light source light may be one or more of 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 tertiary light source light. In specific embodiments, the third device light may (essentially) consist of the tertiary 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 tertiary 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 tertiary 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 360-500 nm, such as from the range of 380-490 nm, especially from the range of 420-490 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 between2700 and 20000 K, for general lighting especially in the range of about 2000-7000 K, such asin 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 in embodiments the LED package), the system light may be white light. In such 2024PF80279 31 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 firstoperational 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 610-660 nm; (B) the second light generating device may comprise a secondary 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; (C) the third light generating device may comprise a tertiary 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 380-490 nm, more especially 420-490; 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. Further, in embodiments, the second device light may be green light and the third device light may be blue light. In embodiments, the LED package may further comprise a fourth light generating device. The fourth light generating device may especially comprise a quaternary solid-state light source and a fourth luminescent converter. The quaternary 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 above). Further, the quaternary solid-state light source may be configured to generate quaternary light source light. The quaternary light 2024PF80279 32 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. Hence, the quaternary 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 quaternary 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 quaternary 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 quaternary light source light received by the fourth luminescent material into fourthluminescent material light. The fourth luminescent material light may have a fourth centroidwavelength (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 quaternary light source light. Especially, the fourth device light may have a spectral power distribution, 2024PF80279 33 wherein ≥ 1%, such as ≥ 2%, especially ≥ 5%, of the spectral power in the wavelength range of 380-780 nm may be provided by the quaternary 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 quaternary 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) yellow (and / or green) 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. Hence, in embodiments the light generating system may comprise a Chip-on- Board. Especially, the first light generating device may comprise, such as be, a Chip-on- Board. The Chip-on-Board may comprise a plurality of the solid-state light sources. The 2024PF80279 34 solid-state light sources, like LEDs, may be of the same wavelength bin, and may be indicated as first solid-state light sources. Optionally, other type of solid-state light sources may also be comprised by the CoB. Such other solid-state light sources, like LEDs, may be indicated as second solid-state light sources and optionally further type of solid-state light sources. The types of solid-state light sources differ in peak emission wavelengths (with in specific embodiments at least about 5 nm difference, more especially at least about 10 nm). This may allow providing peak emission wavelengths in different wavelength ranges. Hence,the first light generating device may comprise the Chip-on-Board (device). In specificembodiments, the first light generating device may be (configured as) a Chip-on-Board. Further, in embodiments the light generating system may comprise a LED filament. Especially, the first light generating device may comprise, such as be, a LED filament. The LED filament may comprise a plurality of the solid-state light sources. The solid-state light sources, like LEDs, may be of the same wavelength bin, and may be indicated as first solid-state light sources. Optionally, other type of solid-state light sources may also be comprised by the LED filament. Such other solid-state light sources, like LEDs, may be indicated as second solid-state light sources and optionally further type of solid-state light sources. The types of solid-state light sources differ in peak emission wavelengths (with in specific embodiments at least about 5 nm difference, more especially at least about 10 nm). This may allow providing peak emission wavelengths in different wavelength ranges. Hence, in embodiments the first light generating device may comprise a LED filament. Yet further, in embodiments the light generating system may comprise a LED package. The LED package may comprise a single solid-state light source, like a LED, or optionally a plurality of the solid-state light sources. When a plurality of solid-state light sources is applied, the solid-state light sources, like LEDs, may be of the same wavelength bin, and may be indicated as first solid-state light sources. Optionally, other type of solid- state light sources may also be comprised by the LED package. Such other solid-state light sources, like LEDs, may be indicated as second solid-state light sources and optionally further type of solid-state light sources. Note that a LED package may comprise sub- packages, each comprising one or more solid-state light source. At least one sub-package may comprise the first light generating device. The types of solid-state light sources differ in peak emission wavelengths (with in specific embodiments at least about 5 nm difference, more especially at least about 10 nm). This may allow providing peak emission wavelengths in different wavelength ranges. 2024PF80279 35 Hence, the LED package may comprises the first light generating device. When the LED package comprises multiple sub-packages, the LED package may comprise the first light generating device and other light generating devices. A control system may control the one or more solid-state light sources. Hence, the control system may control the one or more first solid-state light sources, and optionally one or more second solid-state light sources, and yet optionally one or more further solid- state light sources. The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein “controlling” and similar terms may e.g. refer to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc.. Beyond that, the term “controlling” and similar terms may additionally include monitoring. Hence, the term “controlling” and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element. The controlling of the element can be done with a control system, which may also be indicated as “controller”. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and / or wireless control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. 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. In embodiments, the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I-phone, a tablet, etc.. The device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system. Hence, in embodiments the control system may (also) be configured to be controlled by an App on a remote device. In such embodiments the control system of the lighting system may be a slave control system or control in a slave mode. For instance, the lighting system may be identifiable with a code, especially a unique code for the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system which has access to the lighting system on the basis of 2024PF80279 36 knowledge (input by a user interface of with an optical sensor (e.g. QR code reader) of the (unique) code. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology. The system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”. The term “operational mode may also be indicated as “controlling mode”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or “operational mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and / or after executing the mode one or more other modes may be executed. However, in embodiments a control system may be available, that is adapted to provide at least the controlling mode. Would other modes be available, the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible. The operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e. “on”, without further tunability). Hence, in embodiments, 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. In a further aspect, the invention may provide a luminescent converter as described herein. Especially, in embodiments, the invention may provide a luminescent converter comprising a first particulate luminescent material, a second particulateluminescent material, and a main matrix material. In embodiments, the first particulateluminescent material and the second particulate luminescent material may be configured embedded in the main matrix material. Further, in embodiments, the first particulateluminescent material may comprise a first luminescent material configured to convert at leastpart of excitation light received by the first luminescent material into first luminescent material light having a first centroid wavelength (λc1). Especially, in embodiments, the first centroid wavelength (λc1) may be selected from the range of 600-660 nm. Further, in embodiments, the second particulate luminescent material may comprise a second particulate matrix material and primary particles comprising a second luminescent material (different from the first luminescent material). In embodiments, the primary particles may be 2024PF80279 37 configured embedded in the second particulate matrix material. The second particulate matrix material may further especially be different from the main matrix material. In embodiments, the second luminescent material may comprise a luminescent material of the type M’xM2- 2xAX6 doped with tetravalent manganese. Especially, in embodiments, M’ may comprise an alkaline earth cation. Further, M may comprise a monovalent cation (such as an alkaline cation). Further, in embodiments, A may comprise a tetravalent cation. Furthermore, in embodiments, X may comprise a monovalent anion, at least comprising fluorine (F). Further, in embodiments, the second luminescent material may be configured to convert at least part of excitation light received by the second luminescent material into second luminescent material light having a second centroid wavelength (λc2). Furthermore, in embodiments, the second centroid wavelength (λc2) may be selected from the range of 610-650 nm. Especially, in embodiments, second luminescent material light may have a second full width at half maximum (FWHM2) of ≤ 50 nm). Hence, in specific embodiments, the invention may provide a luminescent converter comprising a first particulate luminescent material, a second particulate luminescent material, and a main matrix material, wherein: (A) the first particulate luminescent material (2100) and the second particulate luminescent material may be configured embedded in the main matrix material; (B) the first particulate luminescentmaterial may comprise a first luminescent material configured to convert at least part ofexcitation light received by the first luminescent material into first luminescent material light having a first centroid wavelength (λc1), wherein the first centroid wavelength (λc1) may be selected from the range of 600-660 nm; (C) the second particulate luminescent material may comprise a second particulate matrix material and primary particles comprising a secondluminescent material (different from the first luminescent material); wherein the primaryparticles may be configured embedded in the second particulate matrix material; wherein the second particulate matrix material may be different from the main matrix material; wherein the second luminescent material may comprise a luminescent material of the type M’xM2- 2xAX6 doped with tetravalent manganese, wherein M’ may comprise an alkaline earth cation, wherein M may comprise a monovalent cation, wherein A may comprise a tetravalent cation, and wherein X may comprise a monovalent anion, at least comprising fluorine (F); wherein the second luminescent material may be configured to convert at least part of excitation light received by the second luminescent material into second luminescent material light having a second centroid wavelength (λc2), wherein the second centroid wavelength (λc2) may be selected from the range of 610-650 nm. 2024PF80279 38 In specific embodiments, the first luminescent material may comprise a luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese, wherein A comprises titanium. Additionally or alternatively, in embodiments, the first luminescent material may comprise K2SiF6:Mn4+. Further, in specific embodiments, the second luminescent material may comprise a luminescent material having at least one emission band having a full width half maximum (FWHM) of at least 60 nm, such as at least 70 nm, like at least 80 nm. Yet further, in specific embodiments, the main matrix material may comprise at least 10 vol. %, such as at least 15 vol. %, like at least 20 vol. %, of a light scattering material selected from the group comprising BaSO4, Al2O3 and TiO2 particles. Moreover, in embodiments, the luminescent converter may comprise a luminescent converter body. The luminescent body may be a layer, like a self-supporting layer. The luminescent body may also be a coating. The luminescent body may also comprise a luminescent coating on a support (especially a light transmissive support in the transmissive mode, or a reflective support in the reflective mode). Especially, the luminescent body may essentially be self-supporting. In embodiments, the luminescent body may comprise a light transmissive body, wherein the luminescent material is embedded. For instance, the luminescent body may comprise a glass body, with luminescent material embedded therein. Or, the glass as such may be luminescent. In other embodiments, the luminescent body may comprise a polymeric body, with luminescent material embedded therein. The luminescent body may have any shape. In general, however, the luminescent body may comprise two essentially parallel faces (i.e. a first side and a second side), defining a height (of the luminescent body). Further, the luminescent body maycomprise a third side (or “edge face”), bridging the first side and second side. The edge facemay be curved in one or two dimensions. The edge face may be planar. The luminescent body may have a rectangular or circular cross-section, though other cross-sections may also be possible, like e.g. hexagonal, octagonal, etc. Hence, the luminescent body may have a circular cross-section, an oval cross-section, square, or non-square rectangular. In embodiments, the luminescent body may have an n-gonal cross-section, wherein n is at least 3, like 4 (square or rectangular cross-section), 5 (pentagonal cross-section), 6 (hexagonal cross-section), 8 (octagonal cross-section) or higher. The first side and second side may also be indicated as “main faces”, as they may especially provide the largest external area of the luminescent body. Perpendicular to the afore-mentioned cross-section, may be another cross- section, which may in embodiments be rectangular. Hence, the luminescent body may e.g. 2024PF80279 39 have a cubic shape, a (non-cubic) cuboid shape, an n-gonal prism shape with n being at least 5 (such as pentagonal prism, hexagonal prism), and a cylindrical shape. Other shapes, however, may also be possible. Especially, the luminescent body may have a cuboid shape, a cylindrical shape, or an n-gonal prism shape wherein n is 6 or 8. In embodiments, the luminescent body (or “body”) has lateral dimensions width or length (WBor LB) or diameter (DB) and a thickness or height (HB). In embodiments, (i) DB ≥ HB or (ii) WB ≥ HB and / or LB ≥HB. The luminescent body may be transparent or light scattering. In embodiments, theluminescent body may comprise a ceramic luminescent material. In specific embodiments,LB≤ 10 mm, such as especially LB≤ 5mm, more especially LB≤ 3mm, most especially LB≤ 2 mm. In specific embodiments, WB ≤ 10 mm, such as especially WB ≤ 5mm, more especially WB≤ 3mm, most especially WB≤ 2 mm. In specific embodiments, HB≤ 10 mm, such as especially HB ≤ 5mm, more especially HB ≤ 3mm, most especially HB ≤ 2 mm. In specific embodiments, DB ≤ 10 mm, such as especially DB ≤ 5mm, more especially DB ≤ 3mm, most especially DB ≤ 2 mm. In specific embodiments, the luminescent body may have a height(HB) in the range 50 µm - 1 mm. Further, the luminescent body may have lateral dimensions(width / diameter) in the range 100 µm – 10 mm. In yet further specific embodiments, (i) DB >HB or (ii) WB > HB and LB > HB. Especially, the lateral dimensions like length, width, and diameter are at least 2 times, like at least 5 times, larger than the height. In specific embodiments, the luminescent body has a first length LB, a first height HB, and a first width WB, wherein HB ≤ 0.5*LB and HB ≤ 0.5*WB. In embodiments, the luminescent body may be a (small) tile. The terms “visible”, “visible light” or “visible emission” and similar terms refer to light having one or more wavelengths in the range of about 380-780 nm. Herein, UV may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm. 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. The terms “green light” or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm. The terms “yellow light” or “yellow emission” especially relate to light having a wavelength in the range of about 570-590 nm. The phrase “light having one or more wavelengths in a wavelength range” and similar phrases may especially indicate that the indicated light (or radiation) has a spectral power distribution with at least intensity or intensities at these one or more wavelengths in the indicate wavelength 2024PF80279 40 range. For instance, a blue emitting solid state light source will have a spectral power distribution with intensities at one or more wavelengths in the 440-495 nm wavelength range. 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. etc... The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. 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. Hence, in an aspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, 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. For instance, in embodiments the lighting device may comprise a housing or a carrier, configured to house or support one or more elements of the light generating system. 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 luminescent converter; Figs.2-3 schematically depict an embodiment of the light generating system, especially of a LED package; Fig.4 schematically depicts an embodiment of a Chip-on-Board; Fig.5 schematically depicts an embodiment of a LED filament; and Fig.6 schematically depicts an embodiment of the lighting device. Fig.7 shows a graph of the intensity in arbitrary units as a function of thewavelength of emission (Em; dashed line) and excitation (Ex; solid line), respectively, for aKSiF phosphor. 2024PF80279 41 Fig.8 shows a graph of the intensity in arbitrary units as a function of the wavelength of emission (Em; dashed line) and excitation (Ex; solid line), respectively, for anOxynitride phosphor.Fig.9 shows a graph of the intensity in arbitrary units as a function of thewavelength of emission (Em; dashed line) for an example of first device light based on aKSiF phosphor and an Oxynitride phosphor. The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Figs.1 schematically depict embodiments of a luminescent converter 2000 according to the invention. In embodiments, the luminescent converter 2000 may comprise a first particulate luminescent material 2100, a second particulate luminescent material 2200, and a main matrix material 700. In embodiments, the first particulate luminescent material 2100 and the second particulate luminescent material 2200 may be configured embedded in the main matrix material 700. The first particulate luminescent material 2100 may especially comprise a first luminescent material 210 configured to convert at least part of excitation light received by the first luminescent material 210 into first luminescent material light 211 having a first centroid wavelength (λc1). Furthermore, in embodiments, the first centroid wavelength (λc1) may be selected from the range of 600-660 nm. In further embodiments, the second particulate luminescent material 2200 may comprise a second particulate matrix material 720 and primary particles 2300 comprising a second luminescent material 220 (different from the first luminescent material 210). In embodiments, the primary particles 2300 may be configured embedded in the second particulate matrix material 720. Moreover, in embodiments, the second particulate matrix material 720 may be different from the main matrix material 700. In embodiments, one or more of the main matrix material 700 and the second particulate matrix material 720 may comprise a crosslinked polysiloxane. Furthermore, in embodiments, the second particulate matrix material 720 may have a lower water permeability than the main matrix material 700. Further, in embodiments, the second particulate matrix material 720 may comprise a fluorinated polymer (such as e.g. fluorinated crosslinked silicone). The second luminescent material 220 may, in embodiments, comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese. In 2024PF80279 42 embodiments, M’ may especially comprise an alkaline earth cation. Further, in embodiments, M may comprise a monovalent cation. Furthermore, in embodiments, A may comprise a tetravalent cation. In further embodiments, X may comprise a monovalent anion, at least comprising fluorine (F). Further, in embodiments, the second luminescent material 220 may be configured to convert at least part of excitation light received by the second luminescent material 220 into second luminescent material light 221 having a second centroid wavelength (λc2). Furthermore, in embodiments, the second centroid wavelength (λc2) may be selected from the range of 610-650 nm. In further embodiments, second luminescent material light 221 may have a second full width at half maximum (FWHM2) of ≤ 50 nm. In further embodiments, one or more of the following applies: |λc2-λc1|≥10 nm and λc1+10 nm≤ λc2. As depicted in Figs.1, the first particulate material 2100 may have a first number averaged equivalent circular diameter D1.Similarly, the second particulate material 2200 may have a second number averaged equivalent circular diameter D2. Yet similarly, the primary particles 2300 may have a third number averaged equivalent circular diameter D3. In embodiments, the third number averaged equivalent circular diameter D3may especially be smaller than the first number averaged equivalent circular diameter D1 and the second number averaged equivalent circular diameter D2. In specific embodiments, D3 ≤ 0.3*D2 and D3≤ 0.3*D1. Additionally, in embodiments, the first number averaged equivalent circular diameter D1 and the second number averaged equivalent circular diameter D2 may be relatively similar. Especially, 0.5≤D2 / D1≤2. As depicted in Fig.1A, subfigure I, the first number averaged equivalent circular diameter D1and the second number averaged equivalent circular diameter D2may be essentially equal, i.e., D1=D2. Alternatively, as depicted in Fig.1A, subfigure III, the first number averaged equivalent circular diameter D1may be larger than the second number averaged equivalent circular diameter D2, i.e., D1≥1.1*D2. Yet alternatively, as depicted in Fig.1A, subfigure IV, the second number averaged equivalent circular diameter D2 may be larger than the first number averaged equivalent circular diameter D1, i.e., D2≥1.1*D1. The number averaged equivalent circular diameters are further schematically depicted in Fig.1B. The luminescent converter 2000 may further, in embodiments, comprise additional luminescent materials. For example, as depicted here, the luminescent converter 2000 may comprise a third luminescent material 230 configured to convert at least part of excitation light received by the third luminescent material 230 into third luminescent material light 131 (see also further below) having a third centroid wavelength (λc3). The third luminescent material 230 may for example comprise a luminescent material of the type 2024PF80279 43 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. Furthermore, in embodiments, the first particulate luminescent material 2100 may have a first aspect ratio AR1. Furthermore, in embodiments, the second particulate luminescent material 2200 may have a second aspect ratio AR2. In embodiments, as depicted in Fig.1A subfigure II, AR2 ≥ 2*AR1. In embodiments wherein AR1 = 1, the first particulate luminescent material particles may especially have a circular shape (as shown in e.g. Fig.1A subfigure II). Further, in embodiments wherein AR2≥ 2, the second luminescent material particles may especially have an elongated shape. This is especially depicted in Fig.1A subfigure II. Furthermore, in embodiments, the luminescent converter 2000 may comprise a third luminescent material 230 configured embedded in the main matrix material 700. For example, in embodiments, the third luminescent material 230 may comprise a luminescent material of the type A3B5O12:Ce3+, 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. Further, in embodiments, the second luminescent material 220 may comprise one or more of (K,Rb)2SiF6:Mn4+and K2(Si,Ti)F6:Mn4+. Moreover, in specific embodiments, the first luminescent material 210 may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese. Especially, in embodiments, A may comprise titanium. Yet further, in embodiments, the first luminescent material 210 may be selected from a divalent europium comprising oxynitride luminescent material and a divalent europium comprising nitride luminescent material. Furthermore, in specific embodiments, the second luminescent material 220 may comprise a luminescent material having at least one emission band having a full width half maximum (FWHM) of at least 60 nm. Further, in embodiments, the second particulate luminescent material 2200 may comprise primary particles 2300 in a primary particle concentration (Cp) selected from the range of 10-40 vol. %. Moreover, in embodiments, the main matrix material 700 may comprise the first particulate luminescent material 2100 in a first luminescent material particle concentration (C1), and the second particulate luminescent material 2200 in a second luminescent material particle concentration (C2). Furthermore, in embodiments, a luminescent material particle concentration (C1+2) may be selected from the range of 3-30 vol. %. In further embodiments, C2 ≥ 2*C1 and Cp ≥ Cl+2. 2024PF80279 44 In further embodiments, the main matrix material 700 may comprise a light scattering material selected from the group comprising BaSO4, Al2O3and TiO2particles embedded in the main matrix material 700. In embodiments, the main matrix material 700 may comprise the light scattering material selected from the range of 5-35 vol. % (relative to the total weight of the main matrix material 700, thus including the first particulate luminescent material 2100, the second particulate luminescent material 2200, and the light scattering material). Especially, in embodiments, the main matrix material 700 may compriseat least 10 vol. % of a light scattering material selected from the group comprising BaSO4,Al2O3and TiO2particles. Figs.2 schematically depict an embodiment of a light generating system 1000 according to the invention. Especially, in embodiments, the light generating system 1000 may comprise a first light generating device 110 and the luminescent converter 2000. In embodiments, the first light generating device 110 may comprise a first solid state light source 10 and a luminescent converter 2000. The first solid-state light source 10 may be configured to generate light source light 11 having a first peak emission wavelength (λp1) selected from the range of 430-490 nm. Further, in embodiments, the luminescent converter 2000 may be configured in a light receiving relationship with the first solid-state light source 10. In embodiments, the luminescent converter 2000 may comprise a first particulate luminescent material 2100, a second particulate luminescent material 2200, and a main matrix material 700. Further embodiments of the luminescent converter 2000 have been described above with Figs.1 and may apply here as well. The first light generating device 110 may, in embodiments, be configured to generate first device light 111. Especially, in embodiments, the first device light 111 may comprise the first luminescent material light 211 and the second luminescent material light 221. Especially, the first device light 111 may have a first device centroid wavelength (λcd,1) selected from the range of 610-660 nm. Fig.2A schematically depicts a LED package 500 comprising the first light generating device 110. In embodiments, the luminescent converter 2000 may be configured to convert at least 98% of the light source light 11 received by the luminescent converter 2000 into first luminescent material light 211 and / or second luminescent material light 221. Additionally or alternatively, in embodiments, the light generating system 1000 may comprise a dichroic reflector 50 (such as depicted in Fig.2B) configured downstream of the luminescent converter 2000. In embodiments, the dichroic reflector 50 2024PF80279 45 may be configured to transmit at least part of the first luminescent material light 211 and at least part of the second luminescent material light 221 received by the dichroic reflector 50. Additionally, in embodiments, the dichroic reflector 50 may be configured to reflect at least part of the light source light 11 received by the dichroic reflector 50 back to the luminescent converter 2000. Fig.3 schematically depicts another embodiment of the light generating system 1000 comprising a LED package 500. The LED package 500 may here comprise a first light generating device 110, a second light generating device 120, and a third lightgenerating device 130. The first light generating device 110 may comprise the luminescentconverter 2000. Moreover, the first light generating device 110 may comprise the solid-state light source 10. In embodiments, the first light generating device 110 may be configured to generate first device light 111 comprising the first luminescent material light 211 and the second luminescent material light 221. 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 620-640 nm. Further, the second light generating device 120 may comprise a secondary 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. Further, the third light generating device 130 may comprise a tertiary solid-state light source 30. Additionally, 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 380-490 nm. 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). Fig.4 may especially schematically depict an embodiment of the light generating system 1000 wherein the light generating system 1000 may comprise a Chip-on- Board (CoB) 600. In embodiments, the Chip-on-Board 600 may comprise a plurality of light sources 10. Further, the Chip-on-Board 600 may comprise the luminescent body 2000. Especially, in a light generating system 1000 comprising a Chip-on-Board 600, the luminescent body 2000 may be configured on top of the plurality of light sources 10. Especially, as depicted in Fig.4, in a light generating system 1000 comprising a Chip-on- 2024PF80279 46 Board 600, the plurality of light sources 10 may (all) be covered by the same luminescent body 2000. Further, the light generating system 1000 may comprise a control system 300. Fig.5 schematically depicts an embodiment of the light generating system 1000 comprising a LED filament 400. Further, the first light generating device 110 may comprise, such as be, the LED filament 400. The LED filament 400 may comprise (i) a plurality of the solid state light sources 10 arranged on a (light-transmissive) elongated carrier 5, and (ii) an elongated encapsulant 410 comprising the luminescent converter 2000. In embodiments, the elongated encapsulant 410 may be configured in physical contact with and covering the plurality of solid state light sources 10 and at least part of the elongated carrier 5. 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 comprised by or functionally coupled to 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 or projector system, which may be used to project images, such as at a wall, 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 spot light, a stage lighting device, an automotive lighting device, a search lighting device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system 1000 as described herein. In embodiments, such lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. 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 thus be system light 1001. Reference 1300 refers to a space, such as a room. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor, reference 1310 to a ceiling, and reference 1307 to a wall. Referring now to Figs. 7 to 8, different suitable phosphors for a lightgenerating system 1000 according to the invention will be described.Fig.7 shows a graph of the intensity in arbitrary units as a function of the wavelength of emission (Em; dashed line) and excitation (Ex; solid line), respectively, for aKSF phosphor. KSF phosphor can be effectively excited by a 455 nm blue LED with astrongest emission peak wavelength at near 630 nm (or 631 nm). 2024PF80279 47 Fig.8 shows a graph of the intensity in arbitrary units as a function of the wavelength of emission (Em; dashed line) and excitation (Ex; solid line), respectively, for anOxynitride phosphor. Oxynitride phosphor can be effectively excited by a 455 nm blue LEDwith a strongest emission peak wavelength at near 615 nm. Referring now to Fig.9, an example of first device light 111 for a light generating system 1000 according to the invention will be described. Fig.9 shows a graph of the intensity in arbitrary units as a function of thewavelength of emission (Em; dashed line) of an example of first device light based on a KSF(K2SiF6:Mn4+) phosphor and an Oxynitride phosphor. Other alternatives include(Ca,Sr)AlSiN3:Eu. Instead of, or in addition to, an Oxynitride phosphor, a Nitride phosphormay be used. Instead of, or in addition to, K2SiF6:Mn4+, K2GeF6:Mn4+ and / orK2TiF6:Mn4+ may be used. For example a combination of KTF (K2TiF6:Mn4+) and anOxynitride phosphor may be used. 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". 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. 2024PF80279 48 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. Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. 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. In yet a further aspect, the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein. 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. 2024PF80279 49 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

2024PF80279 50 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 light source light(11) having a first peak emission wavelength (λp1) selected from the range of 430-490 nm;- the luminescent converter (2000) is configured in a light receiving relationshipwith the first solid-state light source (10); wherein the luminescent converter (2000) comprises a first particulate luminescent material (2100), a second particulate luminescent material (2200), and a main matrix material (700); wherein the first particulate luminescent material (2100) and the second particulate luminescent material (2200) are configured embedded in the main matrix material (700);- the first particulate luminescent material (2100) comprises a first luminescentmaterial (210) configured to convert at least part of the light source light (11) received by the first luminescent material (210) into first luminescent material light (211) having a first centroid wavelength (λc1), wherein the first centroid wavelength (λc1) is selected from the range of 600-660 nm;- the second particulate luminescent material (2200) comprises (i) a secondparticulate matrix material (720) and (ii) primary particles (2300) comprising a secondluminescent material (220) different from the first luminescent material, wherein the primaryparticles (2300) are configured embedded in the second particulate matrix material (720); wherein the second particulate matrix material (720) is different from the main matrix material (700); wherein the second luminescent material (220) comprises a luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese, wherein M’ comprisesan alkaline earth cation, wherein M comprises a monovalent cation, and x is selected fromthe range of 0-1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine (F); wherein the second luminescent material(220) is configured to convert at least part of the light source light (11) received by thesecond luminescent material (220) into second luminescent material light (221) having a2024PF80279 51 second centroid wavelength (λc2), wherein the second centroid wavelength (λc2) is selected from the range of 610-650 nm;- the second particulate luminescent material (2200) comprises the primaryparticles (2300) in a primary particle concentration, Cp, selected from the range of 5-50 vol.%;- (i) the first particulate luminescent material (2100) has a first number averagedequivalent circular diameter D1, (ii) the second particulate luminescent material (2200) has a second number averaged equivalent circular diameter D2, (iii) the primary particles (2300) have a third number averaged equivalent circular diameter D3, and (iv) D3≤ 0.3*D2and D3≤ 0.3*D1;- the first light generating device (110) is configured to generate first devicelight (111) comprising the first luminescent material light (211) and the second luminescent material light (221); and wherein the first device light (111) has a first device centroid wavelength (λcd,1) selected from the range of 610-660 nm.

2. The light generating system (1000) according to claim 1, wherein the firstsolid state light source comprise one or more light emitting diodes.

3. The light generating system (1000) according to claim 1 or 2, wherein0.5≤D2 / D1≤2.

4. The light generating system (1000) according to any one of the precedingclaims, wherein the second luminescent material (220) comprises one or more of (K,Rb)2SiF6:Mn4+and K2(Si,Ti)F6:Mn4+; and wherein the first luminescent material (210) is selected from a divalent europium comprising oxynitride luminescent material and a divalent europium comprising nitride luminescent material.

5. The light generating system (1000) according to any one of the precedingclaims, wherein one or more of the following applies: |λc2-λc1|≥10 nm and λc1+10 nm≤ λc2.

6. The light generating system (1000) according to any one of the precedingclaims, wherein:- the second particulate luminescent material (2200) comprise primary particles(2300) in a primary particle concentration (Cp) selected from the range of 10-40 vol. %;2024PF80279 52- the main matrix material (700) comprises the first particulate luminescentmaterial (2100) in a first luminescent material particle concentration (C1), and the second particulate luminescent material (2200) in a second luminescent material particle concentration (C2), wherein a luminescent material particle concentration (C1+2) is selected from the range of 3-30 vol. %; and- C2 ≥ 2*C1 and Cp ≥ Cl+2.

7. The light generating system (1000) according to any one of the precedingclaims, wherein one or more of the main matrix material (700) and the second matrix material (720) comprises a crosslinked polysiloxane.

8. The light generating system (1000) according to any one of the precedingclaims, wherein the main matrix material (700) comprises a light scattering material selected from the group comprising BaSO4, Al2O3 and TiO2 particles embedded in the main matrix material (700); wherein the main matrix material (700) comprises the light scattering material selected from the range of 5-35 vol. %.

9. The light generating system (1000) according to any one of the precedingclaims, wherein the second particulate matrix material (720) has a lower water permeability than the main matrix material (700).

10. The light generating system (1000) according to any one of the precedingclaims, wherein the second particulate matrix material (720) comprises a fluorinated polymer.

11. The light generating system (1000) according to any one of the precedingclaims, wherein one or more of the following applies:- the luminescent converter (2000) is configured to convert at least 98% of thelight source light (11) received by the luminescent converter (2000) into first luminescent material light (211) and / or second luminescent material light (221); and- the light generating system (1000) comprises a dichroic reflector (50)configured downstream of the luminescent converter (2000), wherein the dichroic reflector(50) is configured to (i) transmit at least part of the first luminescent material light (211) andat least part of the second luminescent material light (221) received by the dichroic reflector2024PF80279 53 (50), and to (ii) reflect at least part of the light source light (11) received by the dichroic reflector (50) back to the luminescent converter (2000).

12. The light generating system (1000) according to any one of the precedingclaims 1-11, wherein one of the following applies:- the light generating system (1000) comprises a LED package (500), whereinthe 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 610-660 nm;- the light generating system (1000) comprises a Chip-on-Board (CoB) (600),wherein the Chip-on-Board (CoB) (600) comprises (i) a plurality of solid-state light sources (10), and (ii) the luminescent converter (2000), wherein the luminescent converter (2000) is configured on top of the plurality of solid-state light sources (10); and- the light generating device (110) is a LED filament (400), wherein the LEDfilament (400) comprises (i) a plurality of the first solid-state light sources (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).

13. A luminescent converter (2000) comprising a first particulate luminescentmaterial (2100), a second particulate luminescent material (2200), and a main matrix material (700), wherein:- the first particulate luminescent material (2100) and the second particulateluminescent material (2200) are configured embedded in the main matrix material (700);- the first particulate luminescent material (2100) comprises a first luminescentmaterial (210) configured to convert at least part of excitation light received by the first luminescent material (210) into first luminescent material light (211) having a first centroid wavelength (λc1), wherein the first centroid wavelength (λc1) is selected from the range of 600-660 nm;- the second particulate luminescent material (2200) comprise a secondparticulate matrix material (720) and primary particles (2300) comprising a second luminescent material (220); wherein the primary particles (2300) are configured embedded in2024PF80279 54 the second particulate matrix material (720); wherein the second particulate matrix material (720) is different from the main matrix material (700); wherein the second luminescent material (220) comprises a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, wherein M comprises an monovalent cation, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine (F); wherein the second luminescent material (220) is configured to convert at least part of excitation light received by the second luminescent material (220) into second luminescent material light (221) having a second centroid wavelength (λc2), wherein the second centroid wavelength (λc2) is selected from the range of 610-650 nm.

14. The luminescent converter (2000) according to claim 13, wherein the firstluminescent material (210) comprises a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein A comprises titanium; the second luminescent material (220) comprises a luminescent material having at least one emission band having a full width half maximum (FWHM) of at least 60 nm; wherein the main matrix material (700) comprises at least 10 vol. % of a light scattering material selected from the group comprising BaSO4, Al2O3and TiO2particles; and wherein the luminescent converter (2000) is a luminescent converter body.

15. A lighting device (1200), selected from the group of a lamp (1), a luminaire(2), a spot light, a stage lighting device, an automotive lighting device, a search lighting device, and a projector comprising the light generating system (1000) according to any one of the preceding claims 1-12.

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