A light generating system comprising a luminescent converter comprising a first, a second, and a third luminescent material

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110), wherein the first light generating device (110) comprises a first solid state light source (10) and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak emission wavelength (λp1) selected from the range of 420-490 nm; (B) the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210), a second luminescent material (220) and a third luminescent material (230); (C) the first luminescent material (210) consists of a luminescent material of the type M'xM2-2xAX6:Mn4+, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); (D) the second luminescent material (220), different from the first luminescent material (210), is configured to convert part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221); (E) the third luminescent material (230) is configured to convert part of the first light source light (11) received by the third luminescent material (230) into third luminescent material light (231); (F) the first light generating device (110) is configured to generate first device light (111), wherein the first device light comprises non-converted first light source light (11'), the first luminescent material light, the second luminescent material light and the third luminescent material light; wherein the first device light has a spectral power distribution, wherein (i) x0% of the spectral power is provided by the non-converted first light source light, (ii) x1% of the spectral power is provided by the first luminescent material light, (iii) x2% of the spectral power is provided by the second luminescent material light, and (iii) x3% of the spectral power is provided by the third luminescent material light; wherein 40% ≥ x0 ≥ 4% and 20% ≥ x1 ≥ 4% and x2 + x3 > x1; and (G) the first device light is white light having a CCT in a range from 2000K to 6500K and a CRI of at least 80.

Description

[0001] 2025PF80119

[0002] 1

[0003] A light generating system comprising a luminescent converter comprising a first, a second, and a third luminescent material

[0004] FIELD OF THE INVENTION

[0005] The invention relates to a light generating system. The invention further relates to a lighting device comprising such light generating system.

[0006] BACKGROUND OF THE INVENTION

[0007] Light generating systems are known in the art. For instance, US20220389313A1 describes a white light emitting device comprising: an LED that generates excitation light of wavelength from 420 nm to 480 nm; and photoluminescence materials that generate light with a peak emission wavelength from 500 nm to 650 nm comprising a broadband phosphor, and a manganese-activated narrowband red fluoride phosphor with a peak emission wavelength from 628 nm to 640 nm and a full width at half maximum of less than 30 nm. The device generates white light with a selected color temperature from 2200K to 6500K, a General Color Rendering Index, CRI Ra, of at least 80, and a Duv (Delta u, v) from 0.0060 to 0.0170 for the selected color temperature and wherein the device has an LER (Luminous Efficacy of Radiation) of at least 320 Im / Wopt.

[0008] SUMMARY OF THE INVENTION

[0009] Conventional light generating systems (e.g. incandescent or fluorescent lamps) are rapidly being replaced by light emitting diode (LED) based lighting solutions. LED-based lighting solutions may generally comprise a light source and a luminescent converter, wherein the luminescent converter may comprise multiple types of phosphors, e.g. a yellow and a red phosphor, to produce especially white light with a suitable color temperature. Further, LED-based lighting solutions may be used to produce colored light, such as for e.g. mood lighting. Colored light may be produced directly using a suitable LED material (direct-color LEDs or dc-LEDs), or may be based on the conversion of (especially blue) LED light by a luminescent converter (phosphor-converted LEDs or pc-LEDs). Pc-LEDs may especially be used for the production of red light. However, the luminescent materials used in a red pc-LED may be susceptible to degradation due to exposure to moisture and / or oxygen. 2025PF80119

[0010] 2

[0011] Degradation of the luminescent material may lead to one or more of a change in the color point of the pc-LED, a drop in efficiency of the pc-LED, and an increase in the amount of (harmful) blue light emitted by the pc-LED.

[0012] Therefore, there is a desire to provide a more stable pc-LED for producing high quality white light with a larger luminous efficacy of radiation. 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.

[0013] According to a first aspect, the invention provides a light generating system comprising a first light generating device. The first light generating device may comprise a first solid state light source and a luminescent converter. Especially, the first solid state light source may be configured to generate first light source light having a first peak emission wavelength (λp₁) selected from the range of 380-500 nm, such as from the range of 420-490 nm. Further, the luminescent converter may be configured in a light receiving relationship with the first solid state light source. In embodiments, the luminescent converter may comprise a first luminescent material, a second luminescent material, and a third luminescent material. The first luminescent material may consist of a luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, such as at least 75 mole% Na, especially at least 90 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Further, the first luminescent material may be configured to convert at least part of the first light source light received by the first luminescent material into first luminescent material light. Especially, the first luminescent material light may have a first centroid wavelength (λc₁) selected from the range of 600-660 nm, such as from the range of 610-650 nm. Further, the first luminescent material light may comprise an emission band having a first full width at half maximum FWHMi of < 55 nm, such as < 50 nm. The second luminescent material, different from the first luminescent material, may be configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light. The second luminescent material light may especially have a second centroid wavelength (λc₂) selected from the range of 590-670 nm, such as from the range of 600-660 nm. The third luminescent material may be configured to convert part of the first light source light received 2025PF80119

[0014] 3

[0015] by the third luminescent material into third luminescent material light. Especially, the third luminescent material light may have a third centroid wavelength (λc₃) selected from the range of 480-600, such as from the range of 500-580 nm. Further, the first light generating device may be configured to generate first device light, wherein the first device light may comprise non-converted first light source light, the first luminescent material light, the second luminescent material light and the third luminescent material light. Especially, the first device light may have a spectral power distribution, wherein (i) xo% of the spectral power in the wavelength range of 380-780 nm may be provided by the non-converted first light source light (ii) xi% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light, (iii) X2% of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light, and (iii) X3% of the spectral power in the wavelength range of 380-780 nm may be provided by the third luminescent material light. In embodiments, 40% > xo > 4% may apply, such as 30% > xo > 3%. Further, in embodiments, 15% > xi > 3%, such as 20% > xi > 4%. Further, in embodiments, X2 + X3 > xi may apply, such as preferably X2 > xi. In embodiment, the first device light may be white light having a correlated color temperature in a range from 2000K to 6500K, such as in a range of 2000K to 4500K, and a color rendering index of at least 80.

[0016] Hence, in specific embodiments, the invention provides a light generating system comprising a first light generating device, wherein the first light generating device comprises a first solid state light source and a luminescent converter, wherein: (A) the first solid state light source is configured to generate first light source light having a first peak emission wavelength (λp₁) selected from the range of 420-490 nm; (B) the luminescent converter is configured in a light receiving relationship with the first solid state light source; wherein the luminescent converter comprises a first luminescent material, a second luminescent material, and a third luminescent material; (C) the first luminescent material consists of a luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetraval ent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material is configured to convert at least part of the first light source light received by the first luminescent material into first luminescent material light; wherein the first luminescent material light has a first centroid wavelength (λc₁) selected from the range of 610-650 nm; wherein the first luminescent material light comprises at least one emission band having a first full width at half maximum 2025PF80119

[0017] 4

[0018] FWHMi of < 50 nm; (D) the second luminescent material, different from the first luminescent material, is configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light; wherein the second luminescent material light has a second centroid wavelength (λc₂) selected from the range of 600-660 nm; (E) the third luminescent material is configured to convert part of the first light source light received by the third luminescent material into third luminescent material light; wherein the third luminescent material light has a third centroid wavelength (λc₃) selected from the range of 500-580 nm; (F) the first light generating device is configured to generate first device light, wherein the first device light comprises nonconverted first light source light, the first luminescent material light, the second luminescent material light and the third luminescent material light; wherein the first device light has a spectral power distribution, wherein (i) xo% of the spectral power in the wavelength range of 380-780 nm is provided by the non-converted first light source light (11 ’), (ii) xi% of the spectral power in the wavelength range of 380-780 nm is provided by the first luminescent material light (211), (iii) X2% of the spectral power in the wavelength range of 380-780 nm is provided by the second luminescent material light (221), and (iii) X3% of the spectral power in the wavelength range of 380-780 nm is provided by the third luminescent material light; wherein 40% > xo > 4% and 20% > xi > 4% and X2 + X3 > xi; and (G) the first device light is white light having a correlated color temperature in a range from 2000K to 6500K and a color rendering index of at least 80. A light generating system with such a first luminescent material may provide narrowband emission with an emission band closer to the maximum spectral sensitivity of the human eye, compared to a luminescent material of the type M’XM2-2xAXe: Mn4+not comprising Na. Hence, such a light generating system, especially such a first light generating device, may provide first device light with a larger luminous efficacy of radiation.

[0019] The light generating system, such as especially the first light generating device, may comprise the first solid state light source. The first solid state light source may be selected from the group comprising a light emitting diode (LED), a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). 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 380-500 nm, such as from the range of 380-490 nm, especially from the range of 400-490 nm, like from the range of 430-490 nm. Hence, the first light source light may be one of violet light and blue light, such as especially blue light. 2025PF80119

[0020] 5

[0021] The term “violet light”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. The term “blue light”, and similar terms, may especially relate to light having a wavelength in the range of about 440-490 nm. The term “peak emission wavelength”, and similar terms, may refer to the wavelength where the radiometric emission spectrum of the light source reaches its maximum, i.e., the peak emission wavelength may denote the wavelength at which the largest (emission intensity) value is found in a graph of the spectral power distribution. The peak emission wavelength may especially be determined at room temperature.

[0022] The (light generating system, such as especially the) first light generating device may further comprise a luminescent converter. The luminescent converter may be configured downstream from the first solid state light source. The terms “downstream” and “upstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here especially the solid state light sources), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. The luminescent converter may be configured in physical contact with and covering (a light escape surface of) the first solid state light source. That is, the luminescent converter may be configured as a coating (on the first solid state light source). Alternatively, the luminescent converter may be configured as a self-supporting luminescent body. In such embodiments, the luminescent converter may be configured: (i) in physical contact with the first solid state light source, or (ii) at a non-zero distance di from (the light escape surface of) the first solid state light source. The non-zero distance di may be selected from the range of > 5 pm, such as from the range of > 10 pm, especially from the range of > 25 pm. Hence, in specific embodiments, the luminescent converter may be physically separated from the first solid state light source.

[0023] In embodiments, the luminescent converter may have a first major converter face and a second major converter face, wherein the second major converter face may be configured opposite the first major converter face. In embodiments, the first light source light may be incident on the first major converter face, and the (first and second) luminescent material light may exit (and / or emanate from) the luminescent converter via the second major converter face. Hence, in specific embodiments, the luminescent converter (comprising the first luminescent material and the second luminescent material) may be configured in a transmissive mode. Herein, the term “transmissive mode” may indicate that when at least part 2025PF80119

[0024] 6

[0025] of the first light source light is propagating in the same direction from the luminescent converter as it was propagating to the luminescent converter directly upstream of the luminescent converter, it may have a direction overlapping with the direction in which the (first and / or second) luminescent material light escapes from the first light generating device. Configuring the luminescent converter in the transmissive mode may facilitate providing the luminescent converter as a coating on the first solid state light source.

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

[0027] For instance, the luminescent material may be able to convert one or more of UV radiation, blue radiation, and green radiation, into visible light. Hence, upon excitation with radiation, the luminescent material may emit radiation. In general, the luminescent material will be a down converter, i.e. radiation with a smaller wavelength is converted into radiation with a larger wavelength (Xex< Xem). In embodiments, the term “luminescence” may refer to phosphorescence. In embodiments, the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “luminescent material light” or “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. Likewise, the term “luminescent material” may in embodiments refer to phosphorescence and / or fluorescence. 2025PF80119

[0028] 7

[0029] 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.

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

[0031] In embodiments, the luminescent material may comprise a luminescent material of the type A₃B₅O₁₂:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc; and wherein the light source light may comprise blue light source light. Especially, A may comprise one or more of Y, Gd and Lu, such as especially one or more of Y and Lu. Especially, B may comprise one or more of Al and Ga, more especially at least Al, such as essentially entirely Al. Hence, especially suitable luminescent materials are cerium comprising garnet materials. Embodiments of garnets especially include A3B5O12 garnets, wherein A comprises at least yttrium (Y) or lutetium (Lu) and wherein B comprises at least aluminum (Al). Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce. Especially, B may comprise aluminum (Al), with optionally gallium (Ga) and / or scandium (Sc) and / or indium (In) up to about 20% of B, more especially up to about 10 % of B (i.e. the B ions essentially consist of > 90 mole % of Al and < 10 mole % of one or more of Ga, Sc, and In). B may especially comprise up to about 10% gallium. In another variant, B and O may at least partly be replaced by Si and N. The element A may especially be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu). Further, Gd and / or Tb are especially only present up to an amount of about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Y 1-xLux)3B50i2: Ce, wherein 0 < x < 1. The term “: Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. This is known to the person skilled in the art. Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, especially 0.1 to 2% (relative 2025PF80119

[0032] 8

[0033] to A). Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art. In embodiments, such luminescent materials may have a suitable spectral distribution, have a relatively high efficiency, and have a relatively high thermal stability.

[0034] In specific embodiments, the luminescent material may comprise (YxiA’x2CeX3)3(AlyiB’y2)5Oi2. Here, A’ comprises one or more elements selected from the group consisting of lanthanides, and B’ comprises one or more elements selected from the group of Ga, In and Sc, wherein xl+x2+x3=l, wherein x3>0, wherein 0<x2+x3<0.2, wherein yl+y2=l, wherein 0<y2<0.2. Especially, x3 is selected from the range of 0.001-0.1. Note that in embodiments x2=0. Alternatively or additionally, in embodiments y2=0.

[0035] In embodiments, the luminescent material may comprise a luminescent material of the type A₃Si₆N₁₁:Ce3+, wherein A comprises one or more of Y, La, Gd, Tb and Lu, such as in embodiments one or more of La and Y. In embodiments, the luminescent material may alternatively or additionally comprise one or more of MS: Eu2+and / or M₂Si₅N₈: Eu2+and / or MAlSiN₃: Eu2+and / or Ca₂AlSi₃O₂N₅: Eu2+, etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba, Sr, Ca)S: Eu, (Ba, Sr, Ca)AlSiN3: Eu and (Ba, Sr, Ca)2Si5Ns: Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations, as is known to the person skilled in the art. In general, Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces. The term “: Eu”, indicates that part of the metal ions (indicated by M) is replaced by Eu (in these examples by Eu2+). For instance, assuming 2% Eu in CaAlSiN₃:Eu, the correct formula could be (Ca₀.₉₈Eu₀.₀₂)AlSiN₃.

[0036] The term “luminescent material” herein especially relates to inorganic luminescent materials. Alternatively or additionally, also other luminescent materials may be applied. For instance quantum dots and / or organic dyes may be applied and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc..

[0037] In embodiments, the luminescent material may comprise a luminescent material of the type M₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Eux. Herein, M may comprise one or more of magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba), such as especially one or more of Ca, Sr, and Ba. Hence, M₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Euxmay especially refer to (Mg, Ca, Sr, Ba)₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Eux. Such a luminescent material may be indicated as an SLA-type phosphor, or SLA phosphor. Luminescent materials of the type 2025PF80119

[0038] 9

[0039] M₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Euxmay be described in US2021171827A1, which is hereby herein incorporated by reference. In M₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Eux, x may be selected from the range of 0 < x < 0.1, such as from the range of 0.0005 < x < 0.08, especially from the range of 0.001 < x < 0.05. Hence, europium (Eu) may not replace more than 10% of the cation M, and may substantially or only be in the divalent state (Eu2+), as is known to the person skilled in the art. Further, in M₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Eux, y may be selected from the range of 0 < y < 1, such as from the range of 0 < y < 0.75, especially from the range of 0 <y < 0.6. In specific embodiments, y = 0. In M₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Eux, z may be selected from the range of 0 < z < 0.1, such as from the range of 0 < z < 0.07, especially from the range of 0 < z < 0.05. Hence, in embodiments, in an SLA phosphor, SiN may replace A1O to a maximum of 10 mole%. In embodiments, an SLA phosphor may crystallize in a UCr4C4 type crystal structure. Hence, the luminescent material may comprise a luminescent material of the type M₁₋xLi₃₋₂yAl₁₊₂y₋zSizO₄₋₄y₋zN₄y₊z: Eux, wherein M comprises one or more of Ca, Sr, and Ba, wherein 0 < x < 0.04, wherein 0 < y < 1, wherein 0 < z < 0.05, and wherein y + z < 1.

[0040] In embodiments, part of the Al in the SLA phosphor may be replaced by gallium (Ga). Hence, the luminescent material may comprise a luminescent material of the type Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Eux, wherein M may comprise one or more of Mg, Ca, Sr, and Ba, and x, y, and z may be as indicated above. Such a luminescent material may be indicated as an SLGA phosphor, especially in embodiments wherein b > 0. In embodiments, b in the formula Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Euxmay be selected from the range of > 0, such as from the range of > 0.05, especially from the range of > 0.1, like from the range of > 0.15. Additionally or alternatively, b may be selected from the range of < 0.6, such as from the range of < 0.5, especially from the range of < 0.4, like from the range of < 0.3. Especially, 0 < b < 0.6 may apply, such as 0.05 < b < 0.5, especially 0.1 < b < 0.3, like 0.15 < b < 0.3.

[0041] Further, the luminescent material may comprise a SiAlON phosphor, such as selected from the group comprising (a) Si₁₂₋m₋nAlm₊nOnN₁₆₋n: Eu2+(α-SiAlON), (b) Si₆₋nAlnOnN₈₋n: Eu2+, wherein 0 < n < 4.2 (β-SiAlON), and (c) Si₂₋nAlnO₁₊nN₂₋n: Eu2+, wherein 0 < n < 0.2 (O-SiAlON).

[0042] In embodiments, the luminescent material may comprise a tetravalent manganese-comprising luminescent material, i.e., a luminescent material doped with tetravalent manganese. Especially, in embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2XAXe doped with tetravalent manganese, wherein 2025PF80119

[0043] 10

[0044] M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x may be selected from the range of 0-1, wherein A comprises a tetraval ent cation, for instance comprising one or more of silicon and titanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Such luminescent materials may herein also be indicated as “KSiF” or “KSF”, regardless of the composition of M’, M, A, and X. A luminescent material of the type M’xM2-2xAXe doped with tetravalent manganese is amongst others described in WO2013121355A1, which is herein incorporated by reference. Passages from WO2013121355A1 are also copied herein. In embodiments, the alkaline earth cation M’ may comprise one or more of magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba. Further, the alkaline cations M may comprise one or more of sodium (Na), potassium (K) and rubidium (Rb). Optionally, M may (further) comprise one or more of ammonium (NH₄⁺), lithium (Li), and cesium (Cs). In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. The phrase “wherein M comprises at least potassium” indicates for instance that of all M cations in a mole M’xM2-2xAX6, a fraction comprises K+and an optionally remaining fraction comprises one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’xM2-2xAX6 luminescent material has the hexagonal phase. In yet another embodiment, the M’xM2-2xAX6 luminescent material has the cubic phase. In an embodiment, a combination of different alkaline cations M may be applied. In yet another embodiment, a combination of different alkaline earth cations M’ may be applied. In yet another embodiment, a combination of one or more alkaline cations M and one or more alkaline earth cations M’ may be applied. For instance, KRbo.5Sro.25AX6 might be applied. As indicated above, x in the formula M’xM2-2xAX6 may be selected from the range of 0-1, especially x < 1. In specific embodiments, x = 0.

[0045] The term “tetravalent manganese” refers to Mn4+. This is a well-known luminescent ion. In the formula as indicated above, part of the tetraval ent cation A (such as Si) is being replaced by manganese. Hence, M’xM2-2xAX6 doped with tetravalent manganese may also be indicated as M’xM2-2xAi-mMnmX6 (or M’xM2-2xAX6: Mn4+). The mole percentage of manganese, i.e. the percentage it replaces the tetraval ent cation A will in general be in the range of 0.1-15 %, especially 1-12 %, i.e. m is in the range of 0.001-0.15, especially in the range of 0.01-0.12. As manganese replaces part of a host lattice ion and has a specific function, it is also indicated as “dopant” or “activator”. Hence, the hexafluorosilicate is doped or activated with manganese (Mn4+). 2025PF80119

[0046] 11

[0047] In embodiments, A may comprise a tetravalent cation, and preferably at least comprises silicon. A may optionally (further) comprise one or more of titanium (Ti), germanium (Ge), tin (stannum) (Sn) and zinc (Zn). Further, A may comprise one or more of zirconium (Zr), and hafnium (Hf). Preferably, at least 80%, even more preferably at least 90%, such as at least 95% of A consists of silicon. In a specific embodiment, M’xM2-2xAX6 can also be described as (Ki-r-i-n-c-nh RbrLiiNanCsc(NH4)nh)2AX6, wherein r is in the range of 0-1, wherein l,n,c,nh are each individually preferably in the range of 0-1, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05, and wherein r+l+n+c+nh is in the range of 0-1, especially 1+n+c+nh < 1, especially < 0.2, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05. X is preferably fluorine (F). Further, in a specific embodiment, M’xM2-2xAX6 can also be described as MgmgCacaSrsrBaba(KkRbrLiiNanCsc(NH4)nh)2AX6, with k, r, 1, n, c, nh each individually being in the range of 0-1, wherein mg, ca, sr, ba are each individually in the range of 0-1, and wherein mg+ca+sr+ba+k+r+l+n+c+nh=1. In embodiments, k=l, and the others (mg, ca, sr, ba, r, 1, n, c, nh) are zero.

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

[0049] In an embodiment, M’xM2-2xAX6 comprises K₂SiF₆ (indicated herein also as KSiF system). In another preferred embodiment, M’xM2-2xAX6 comprises KRbSiF₆ (herein also indicated as K, Rb system). In specific embodiments, the indication M’xM2-2xAX6 may refer to one or more of (K, Rb)2SiFg: Mn4+, (K, Rb)2TiFg: Mn4+, K₂(Si, Ti)F₆: Mn4+, and Rb2(Si, Ti)Fs: Mn4+, such as one or more of K2TiFg: Mn4+, of K₂SiF₆: Mn4+, and of Rb2SiF6: Mn4+. As can be derived from the above, “(Si, Ti)” may indicate one or more of Si and Ti. Hence, in specific embodiments, the luminescent material may comprise one or more 2025PF80119

[0050] 12

[0051] of (K, Rb)₂SiF₆: Mn4+and K₂(Si, Ti)F₆: Mn4+. The luminescent material may also be coated, as also described in WO2013121355A1.

[0052] Hence, when M (or A) in chemical formulas refer to n different elements, this may imply that the relevant formula may comprise for the M (or A) position in the formula essentially any permutation of the n different elements. For instance, when M=Ba, Sr, Ca, or when M comprises one or more of Ba, Sr, Ca, i.e. n=3, this may imply that in the formula Ba, Sr, Ca, (BaxSry), (BaxCay), (CaxSry), or (BaxSryCaz), may be available, wherein in general x+y+z=1. Referring to e.g. M’xM2-2XAXs, this may refer to e.g. one or more of K₂SiF₆: Mn4+and of Rb2SiF6: Mn4+, or (KxRby)₂SiF₆: Mn4+, etc. Referring to (Ba, Sr, Ca)AlSiN3: Eu, this may imply BaAISiNvEu. SrAISiN.vEu. CaAISiNvEu. (BaxSry)AlSiN3: Eu, (BaxCay)AlSiN3: Eu, (CaxSry)AlSiN3: Eu, or (BaxSryCaz)AlSiN3: Eu. Referring to e.g. AsBsO^Ce, wherein A in embodiments comprises one or more of Y, La, Gd, Tb and Lu, this may imply YsBsOn Ce. La3BsOi2: Ce, GdBsOn C e. TbsBsOn Ce. LmBsOn Ce. but also e.g. (Yx, Gdy)3BsOi2: Ce, (Yx, Luy)3B50i2: Ce, (Gdx, Luy)3B50i2: Ce, (Yx, Gdy, Luz)3B50i2: Ce, etc. etc., with hereby only limiting for the sake of economy to unary, binary, and ternary examples, though quaternary and higher examples are not excluded herein. Further, indications like “K, Rb” or Ba, Sr, Ca, and similar indications (see also above), may indicate one or more of such elements. Hence, (K, Rb)₂SiF₆: Mn4+, may e.g. refer to K₂SiF₆: Mn4+and of Rb₂SiF₆: Mn4+, or (KxRby)2SiF6: Mn4+. Also herein in general x+y=1. Hence, when M (or A) may refer to n different elements, with n being at least two, 2n-1 permutations may in principle be possible.

[0053] As indicated above, the luminescent converter may comprise the first luminescent material. The first luminescent material may consist of any (combination) of the luminescent materials provided above. Yet, especially, the first luminescent material may comprise a luminescent material of the type M’xM2-2XAXs: Mn4+(or “M’xM2-2XAX6 doped with tetravalent manganese”), wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Further, the first luminescent material may comprise one or more further (types of) luminescent materials, such as selected from the (types of) luminescent materials provided above. Additionally or alternatively, the first luminescent material may comprise one or more luminescent materials of the type M’xM2-2XAXe: Mn4+, wherein the one or more luminescent materials of the type M’xM2-2XAXs: Mn4+may differ in the composition of M and / or the composition of A.

[0054] Especially, the first luminescent material may consist for at least 90 wt.%, like at least 95 2025PF80119

[0055] 13

[0056] wt.%, including (essentially) 100 wt.%, of the (one or more) luminescent material(s) of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Yet, in specific embodiments, the first luminescent material may consist for at least 90 wt.% of the luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetraval ent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. A first luminescent material consisting for at least 90 wt.% of one or more luminescent materials of the type M’xM2-2xAX6: Mn4+may especially provide narrowband emission.

[0057] In embodiments, M (in the formula M’xM2-2xAX6: Mn4+) may comprise an alkaline cation. Further, A (in the formula M’xM2-2xAX6: Mn4+) may comprise one or more of silicon, titanium, and germanium. Additionally or alternatively, A (in the formula M’XM2-2XAXg: Mn4+) may comprise one or more of tin, zinc, zirconium, and hafnium. Yet, especially, A may comprise Si. Additionally or alternatively, A may comprise Ti. Further, in the formula M’xM2-2xAX6: Mn4+, M may comprise K. Yet, especially, M may at least comprise Na. Hence, in embodiments, the first luminescent material may comprise (Ki-yiNayi)2(SixiTii-xi)F6: Mn4+. In such embodiments, xl may be selected from the range of > 0, such as from the range of > 0.2, especially from the range of > 0.4. Additionally or alternatively, xl may be selected from the range of < 1, such as from the range of < 0.9, especially from the range of < 0.8. Hence, in embodiments, 0 < xl < 1 may apply, such as 0.2 < xl < 0.9, especially 0.4 < xl < 0.8. Further, y 1 may be selected from the range of < 1, such as from the range of < 0.9, especially from the range of < 0.8. Additionally or alternatively, y 1 may be selected from the range of > 0.1, such as from the range of > 0.3, especially from the range of > 0.5, like from the range of > 0.7. Further, yl may be selected from the range of > 0.8, such as from the range of > 0.9, especially from the range of > 0.95, including (essentially) yl = 1. Hence, in specific embodiments, the first luminescent material may consist of (Ki-yiNayi)2(SixiGeziTii-xi-zi)Fs: Mn4+, wherein yl > 0.5 and 0.5 < xl < 1 and 0 < zl < 0.5. Such a first luminescent material may have a relatively high absorption at the first peak emission wavelength (λp₁). Further, a first luminescent material with yl > 0.5 may have a relatively higher intensity at shorter wavelengths than a first luminescent material with yl < 0.5, thereby providing 2025PF80119

[0058] 14

[0059] emission having a larger overlap with the spectral sensitivity of the human eye and therewith a higher efficacy.

[0060] As indicated above, yl in the formula (Ki-yiNayi)2(SixiTii-xi)F6: Mn4+may be selected from the range of > 0.8, such as from the range of > 0.9, especially from the range of > 0.95, including (essentially) yl = 1. Hence, in embodiments, the first luminescent material may consist of Na2(SixiTii-xi)F6: Mn4+, wherein 0 <xl < 1. As indicated above, Na₂(SixiTii-xi)F₆: Mn4+may also be written as Na₂(Si, Ti)F₆: Mn4+. Hence, in specific embodiments, the first luminescent material may consist of Na₂(Si, Ti)F₆: Mn4+. Further, xl in the formula Na2(SixiTii-xi)F6: Mn4+may be selected from the range of > 0.8, such as from the range of > 0.9, especially from the range of> 0.95, including (essentially) xl = 1. Hence, in embodiments, the first luminescent material may comprise Na₂SiF₆: Mn4+. Especially, the first luminescent material may consist for at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of Na₂SiF₆: Mn4+. Hence, in specific embodiments, the first luminescent material may consist of Na₂SiF₆: Mn4+. Such a first luminescent material may have emission with a peak (especially a zero phonon line) between 615-625 nm. Hence, such a first luminescent material may provide first luminescent material light having an emission spectrum with an increased overlap with the spectral sensitivity curve of the human eye, thereby improving the luminous efficacy of radiation of the first light generating system. Further, such a first luminescent material may have a relatively shorter luminescence decay time compared to K₂SiF₆: Mn4+, thereby facilitating the use of pulse width modulation (PWM) dimming.

[0061] The first luminescent material may be configured to convert part of the first light source light received by the first luminescent material into first luminescent material light. Especially, the first luminescent material may be configured to convert at least 5%, such as at least 10%, especially at least 20%, more especially at least 25%, of the first light source light received by the luminescent converter into first luminescent material light.

[0062] Additionally or alternatively, the first luminescent material may be configured to convert at most 65%, such as at most 60%, especially at most 55%, of the first light source light received by the luminescent converter into first luminescent material light.

[0063] 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 2025PF80119

[0064] 15

[0065] 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 band normalized to the integrated intensity). The centroid wavelength may e.g. be determined at operation conditions. In embodiments, the first centroid wavelength (λc₁) may be selected from the range of 600-660 nm, such as from the range of 610-650 nm, especially from the range of 620-640 nm, like from the range of 625-635 nm. Hence, in embodiments, the first luminescent material light may comprise, such as be, one or more of orange light and red light, such as especially red light. The terms “orange light” or “orange emission”, and similar terms, may especially relate to light having a wavelength in the range of about 590-620 nm. The terms “red light” or “red emission”, and similar terms, may especially relate to light having a wavelength in the range of about 620-780 nm.

[0066] Further, the first luminescent material light may comprise an emission band having a first full width at half maximum FWHMi of < 55 nm, such as < 50 nm, especially < 45 nm. Further, the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHMi of < 35 nm, such as < 30 nm, especially < 25 nm. In embodiments, the first luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the first full width at half maximum FWHMi. 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.

[0067] The luminescent converter may further comprise a second luminescent material. The second luminescent material may comprise any (combination) of the luminescent materials indicated above. Yet, especially, the second luminescent material may be different from the first luminescent material. That is, the second luminescent material may (a) be of a different type than the first luminescent material, or (b) be of the same type as the first luminescent material, wherein the (atomic) composition of the second luminescent material may differ from the (atomic) composition of the first luminescent material. 2025PF80119

[0068] 16

[0069] The second luminescent material may comprise a luminescent material of the type Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, and wherein 0 < z < 0.1 (i.e., an SLA phosphor, see above). Further, the second luminescent material may comprise a luminescent material of the type Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Eux, wherein M may comprise one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6 (i.e., an SLGA phosphor). Additionally or alternatively, the second luminescent material may comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials and divalent europium comprising nitride luminescent materials. Additionally or alternatively, the second luminescent material may comprise a luminescent material selected from the group of SiAlON luminescent materials (i.e., the second luminescent material may comprise a Si Al ON phosphor as described above). Additionally or alternatively, the second luminescent material may comprise a luminescent material of the type M’xM2-2XAXs: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine(; wherein the composition of the second luminescent material may differ from the composition of the first luminescent material). Hence, in specific embodiments, the second luminescent material may comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, (divalent europium comprising) SiAlON luminescent materials, luminescent materials of the type M’xM2-2XAXe: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine, and luminescent materials of the type Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6. Such a second luminescent material may especially provide broadband emission. Additionally or alternatively, such a second luminescent material may especially provide narrowband emission, wherein the spectral power distribution of the second luminescent material light may be different from a spectral power distribution of the first luminescent material light. Further, such a second luminescent material may be relatively more (thermally and / or chemically) stable than the first luminescent material. 2025PF80119

[0070] 17

[0071] Hence, the second luminescent material may comprise a luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, x is in the range of 0-1, wherein A comprises a tetraval ent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Especially, M (in the formula M’XM2-2xAXe: Mn4+) may comprise a monovalent cation selected from the group of NH4, Li, K, Rb, and CS. Additionally or alternatively, the second luminescent material may comprise (a divalent europium comprising nitride luminescent material, such as especially) (Sr, Ca)AlSiN3: Eu2+. Hence, in specific embodiments, the second luminescent material may comprise one or more of (a) a luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M comprises a monovalent cation selected from the group of NH4, Li, K, Rb and Cs, and (b) (Sr, Ca)AlSiN3: Eu2+. Such a second luminescent material may especially provide narrowband emission, broadband emission, or a combination thereof. Further, such a second luminescent material may be relatively efficient in converting first light source light into second luminescent material light.

[0072] Hence, the second luminescent material may comprise (Sr, Ca)AlSiN3: Eu2+. Especially, the second luminescent material may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of (Sr, Ca)AlSiN3: Eu2+. Additionally or alternatively, the second luminescent material may consist for at most 98 wt.%, such as at most 95 wt.%, especially at most 90 wt.%, of (Sr, Ca)AlSiN3: Eu2+. Yet, in specific embodiments, the second luminescent material may consist for at least 90 wt.% of (Sr, Ca)AlSiN3: Eu2+. Such a second luminescent material may provide second luminescent material light having a relatively short wavelength compared to other divalent europium comprising (oxy)nitride luminescent materials.

[0073] Additionally or alternatively, as indicated above, the second luminescent material may comprise a luminescent material of the type M’xM2-2xAX6: Mn4+. In such embodiments, M may comprise one or more of Na, NH4, Li, K, Rb, and CS, such as especially one or more of Na and K. Further, A may comprise one or more of Si, Ti, and Ge, such as especially one or more of Si and Ti. Hence, the second luminescent material may comprise (Ki-y2Nay2)2(Six2Tii-x2)F6: Mn4+. In such embodiments, x2 may be selected from the range of > 0, such as from the range of > 0.2, especially from the range of > 0.4. Additionally or alternatively, x2 may be selected from the range of < 1, such as from the range of < 0.9, especially from the range of < 0.8. Hence, in embodiments, 0 < x2 < 1 may apply, such as 0.2 < x2 < 0.9, especially 0.4 < x2 < 0.8. Further, y2 may be selected from the range of < 0.9, 2025PF80119

[0074] 18

[0075] such as from the range of < 0.7, especially from the range of < 0.5. Additionally or alternatively, y2 may be selected from the range of > 0, such as from the range of > 0.1, especially from the range of > 0.2. As indicated above, the first luminescent material may comprise (Ki-yiNayi)2(SixiTii-xi)F6: Mn4+. Further, as indicated above, the second luminescent material may be different from the first luminescent material. Hence, in embodiments, y1 ≠ y2 may apply, such as yl > y2, especially yl > 1.5*y2, like yl > 2*y2. Further, yl > 4*y2 may apply, such as yl > 5*y2, especially yl > 6*y2. Additionally or alternatively, x1 ≠ x2 may apply, such as x2 < xl, especially x2 < 0.9*xl. Alternatively, xl = x2 may apply. Hence, in specific embodiments, the first luminescent material may comprise (Ki-yiNay1)2(8 ixiTii-xi)Fs: Mn4+, and the second luminescent material may comprise (Ki-y2Nay2)2(SiX2Tii-X2)Fg: Mn4+, wherein yl > y2. Such a first and second luminescent material may thus provide light having different spectral power distributions. Especially, such a first and second luminescent material may facilitate that the first luminescent material light may have a relatively higher intensity at shorter wavelengths than the second luminescent material light.

[0076] As indicated above, yl > y2 may apply. Further, in embodiments, y2 may be selected from the range of < 0.9, such as from the range of < 0.7, especially from the range of < 0.5. Especially, y2 may be selected from the range of < 0.3, such as from the range of < 0.2, especially from the range of < 0.1, including (essentially) y2 = 0. That is, in embodiments, the second luminescent material may comprise (such as consist of) K2(SiX2Tii-X2)F6: Mn4+. In such embodiments, 0 < x2 < 1 may apply, such as 0.2 < x2 < 0.9, especially 0.4 < x2 < 0.8. Hence, in specific embodiments, the second luminescent material may comprise (such as consist of) K₂SiF₆: Mn4+. Alternatively, the second luminescent material may comprise (such as consist of) K₂TiF₆: Mn4+. Alternatively, the second luminescent material may comprise a combination of Si and Ti. Hence, in specific embodiments, the second luminescent material may comprise K2(SiX2Tii-X2)F6: Mn4+, wherein 0 < x2 < 1. Such a second luminescent material may provide narrowband second luminescent material light, having a spectral power distribution different from the spectral power distribution of the first luminescent material light. Especially, such a second luminescent material may have a relatively stronger emission at wavelengths where the first luminescent material may have a relatively weaker emission (and vice versa), thereby facilitating providing a (combined) emission spectrum with relatively broad peaks.

[0077] In the above, the mol fraction of Mn4+in the formulas (Ki-y2Nay2)2(SiX2Tii-X2)Fg: Mn4+and K2(SiX2Tii-X2)F6: Mn4+has not been taken into account for the value of x2. It will be obvious to the skilled person that the formula (Ki-y2Nay2)2(SiX2Tii-X2)F6: Mn4+(and 2025PF80119

[0078] 19

[0079] K2(SiX2Tii-X2)F6: Mn4+) with 0 < x2 < 1 may further be indicated as (Ki-y2Nay2)2(Sixt-xmTii-xtMnXm)F6(and K2(Sixt-xmTii-xtMnxm)F6), wherein 0 < xt + xm < 1, and wherein xm may be selected from the range of 0.001-0.15, especially from the range of 0.01-0.12.

[0080] As indicated above, the formula K2(SiX2Tii-X2)F6: Mn4+wherein 0 < x2 < 1 may further be indicated as K₂(Si, Ti)F₆: Mn4+. Further, as indicated above, the first luminescent material may comprise Na₂(Si, Ti)F₆: Mn4+. Hence, in specific embodiments, the first luminescent material (210) comprises Na₂(Si, Ti)F₆: Mn4+, and wherein the second luminescent material (220) comprises K₂(Si, Ti)F₆: Mn4+. Such a first and second luminescent material may facilitate that the second luminescent material may have a relatively stronger emission at wavelengths where the first luminescent material may have a relatively weaker emission (and vice versa), thereby facilitating providing a (combined) emission spectrum with relatively broad peaks. In embodiments, Na₂(Si, Ti)F₆: Mn4+may further be referred to as NSF (phosphor). Hence, the invention may provide a phosphor-converted LED comprising NSF and a further red phosphor.

[0081] The second luminescent material may be configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light. Especially, the second luminescent material may be configured to convert > 20%, such as > 30%, especially > 45%, of (a spectral power of) the first light source light received by the luminescent converter into second luminescent material light. Additionally or alternatively, the second luminescent material may be configured to convert < 80%, such as < 75%, especially < 70%, of (a spectral power of) the first light source light received by the luminescent converter into second luminescent material light.

[0082] 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 590-670 nm, such as from the range of 600-660 nm, especially from the range of 600-650 nm. Hence, the second luminescent material light may be orange light or red light, such as especially red light. The second centroid wavelength (λc₂) may be (roughly) equal to the first centroid wavelength (λc₁ ), such as differ by < 5 nm, especially by < 2 nm, including by (essentially) 0 nm. Alternatively, the second centroid wavelength (λc₂) may differ from the first centroid wavelength (λc₁). In embodiments, |Xc2-λc₁| > 5 nm (may apply), such as |Xc2-λc₁| > 10 nm, especially |Xc2-λc₁| > 20 nm. Additionally or alternatively, in embodiments, |Xc2-λc₁| < 50 nm (may apply), such as |Xc2-λc₁| < 40 nm, especially |Xc2-λc₁| < 30 nm.

[0083] Further, the second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2 of > 30 nm, such as > 40 2025PF80119

[0084] 20

[0085] nm, especially > 50 nm. Additionally or alternatively, the second luminescent material light may comprise the at least one emission band having a second full width at half maximum FWHM2 of < 200 nm, such as < 175 nm, especially < 150 nm. The second luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the second full width at half maximum FWHM2. Alternatively, the second luminescent material light may comprise a single emission band, wherein said emission band may have the second full width at half maximum FWHM2.

[0086] The third luminescent material may comprise any (combination) of the luminescent materials indicated above. In specific embodiments, the third 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. The third luminescent material may be configured to convert at least part of the first light source light received by the third luminescent material into third luminescent material light. Especially, the third luminescent material may be configured to convert > 20%, such as > 30%, especially > 40% of (a spectral power of) the first light source light into third luminescent material light. The third luminescent material light may have a third centroid wavelength (λc₃). Especially, the third centroid wavelength (λc₃) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-580 nm. Hence, the third luminescent material light may be green light or yellow light, such as especially green light.

[0087] In specific embodiments, the first luminescent material may consist of Na₂(Si, Ti)F₆: Mn4+, and the second luminescent material may comprise K₂(Si, Ti)F₆: Mn4+. In alternative specific embodiments, the first luminescent material may consist of Na₂(Si, Ti)F₆: Mn4+, and the second luminescent material may comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials and divalent europium comprising nitride luminescent materials.

[0088] As indicated above, the first light generating device may be configured to generate first device light. In embodiments, the first device light may comprise nonconverted first light source light, the first luminescent material light, the second luminescent material light and the third luminescent material light. Especially, in embodiments, the first device light may have a spectral power distribution, wherein xo% of the spectral power in the wavelength range of 380-780 nm may be provided by the non-converted first light source light. In embodiments, x0may be selected from the range of > 0.01%, such as from the range of > 2%, especially from the range of > 4%. xo may further be selected from the range of > 2025PF80119

[0089] 21

[0090] 10%, such as from the range of > 15%, especially from the range of > 20%. Additionally or alternatively, x0may be selected from the range of < 60%, such as from the range of < 50%, especially from the range of < 40%. Hence, in embodiments, the first device light may have a spectral power distribution, wherein 2-50%, such as 4-40%, especially 3%-30% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light. Especially, in embodiments, the first device light may have a spectral power distribution, wherein x1% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light. In embodiments, x1may be selected from the range of > 2%, such as from the range of > 3%, especially from the range of > 4%. Additionally or alternatively, x1may be selected from the range of < 40%, such as from the range of < 30%, especially from the range of < 20%. Hence, in embodiments, the first device light may have a spectral power distribution, wherein 2-40%, such as 3-50%, especially 4-20%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light.

[0091] In embodiments, X2 + X3 > xi may apply, such as preferably X2 > xi. Such a ratio between (a spectral power of) the first luminescent material light and (a spectral power of), the second luminescent material light, and (a spectral power of) the third luminescent material light may facilitate that the first luminescent material light may have a roughly equal or lower spectral power than the second luminescent material light in the first device light. Hence, upon degradation or quenching of the first luminescent material, a substantial part of the first light source light may still be converted into luminescent material light.

[0092] In embodiments, xi + X2 < 70% may apply, such as xi + X2 < 60%, especially xi + X2 < 50%. Additionally or alternatively, in embodiments, xi + X2 > 25% may apply, such as xi + X2 > 35%, especially xi + X2 > 40%. Such a value for xi + X2 may facilitate that the first device light may comprise a sufficient amount of the first luminescent material light and the second luminescent material light to create (warm) white light.

[0093] The first device 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 1500 K and 20000 K, such as between 2000 and 20000 K, especially between 2700 and 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700-6500 K. In embodiments, the correlated color temperature (CCT) may especially be within about 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 2025PF80119

[0094] 22

[0095] BBL. Hence, the first device light may be white light with a CCT selected from the range of > 1500 K, such as from the range of > 1700 K, especially from the range of > 2000 K.

[0096] Additionally or alternatively, the system light may be white light having a CCT selected from the range of < 8000 K, such as from the range of < 7000 K, especially from the range of < 6500 K. Hence, the first device light may be white light having a CCT selected from the range of 1500-8000 K, such as from the range of 1700-7000 K, especially from the range of 2000-6500 K. Further, the first device light may have a color rendering index (CRI) of at least 70, such as at least 75, especially at least 80.

[0097] In specific embodiments, (x1+ x2) > x3may apply, and the first device light may be white light having a correlated color temperature in a range from 2000K to 3000K.

[0098] As already described in detail above, the third luminescent material may comprise any (combination) of the luminescent materials indicated above. Depending on the composition of the third luminescent material, the third luminescent material light may have a CIE u’-value, u’3 in the CIE u'v' color diagram, also referred to as the CIE 1976 UCS diagram or CIE 1976 color space. Further, the first device light may have a correlated color temperature, CCT1 and the first device light may have a spectral power distribution, wherein X2% of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light and X3% of the spectral power in the wavelength range of 380-780 nm may be provided by the third luminescent material light.

[0099] The spectral contributions of the second luminescent material light and the third luminescent material light may depend on the CIE u’-value, u’3 of the third luminescent material light as well as the correlated color temperature, CCT1, of the first device light.

[0100] The spectral contributions of the second luminescent material light may, X2, be determined according to the following equation: fi-(0.95 - 2-u’s - 2.6-10'5-CCTl - 4.5-10'4-U’3-CCT1) < x2< f2-(0.95 - 2-U’3- 2.6-10'5-CCTl - 4.5-10'4-U’3-CCT1), wherein fi and f2may be multiplication factors determining a range of the spectral contributions of the second luminescent material light, X2. f1may be equal to 0.7, such as 0.8, especially 0.9. f2may be equal to 1.3, such as 1.2, especially 1.1. Alternatively or additionally, the spectral contributions of the second luminescent material light may be determined according to the following equation: (0.95 - 2-u’3- 2.6- 10'5-CCTl - 4.5- 10'4-U’3-CCT1) - f3< x2< (0.95 -2-U’3- 2.6-10'5-CCTl - 4.5-10'4-U’3-CCT1) + f), wherein f3may be a correction factor determining a range of the spectral contributions of the second luminescent material light, x2. f3may be 0.3, such as 0.2, especially 0.1. 2025PF80119

[0101] 23

[0102] The spectral contributions of the third luminescent material light, x3, may be determined according to the following equation: fi-(-0.012 + 1.95-u’s + 1.2-1O'5-CCT1 + 2.5T0'4-u’3’CCTl) < x3< f2-(-0.012 + 1.95-u’3+ 1.2-1O'5-CCT1 + 2.5-10'4-U’3-CCT1), wherein fi and f2may be multiplication factors determining a range of the spectral contributions of the third luminescent material light, x3. fi may be equal to 0.7, such as 0.8, especially 0.9. f2may be equal to 1.3, such as 1.2, especially 1.1. Alternatively or additionally, the spectral contributions of the third luminescent material light may be determined according to the following equation: -(-0.012 + 1.95-u’s + 1.2-1O'5-CCT1 + 2.5-10'4-U’3-CCT1) - f3< x3< (-0.012 + 1.95-U’3+ 1.2-1O'5-CCT1 + 2.5-10'4-U’3-CCT1) + f3, wherein I? may be a correction factor determining a range of the spectral contributions of the third luminescent material light, x2. I? may be 0.3, such as 0.2, especially 0.1.

[0103] Such values for x2and x3may facilitate that the first device light may comprise the right amounts of second luminescent material light and third luminescent material light to create white light of good quality and with the desired properties. The spectral contributions may be aligned with the color point of the second luminescent material and the (desired) CCT of the first device light. The first device light created in this way may preferably have a CRI of around 80.

[0104] The first luminescent material may be present as a powder in the luminescent converter. Hence, the first luminescent material may comprise first luminescent particles. In embodiments, the first luminescent particles may be homogeneous particles. Yet, alternatively, (each of) the first luminescent particles may comprise a first luminescent particle core and a first luminescent particle shell. The first luminescent particle shell may especially be configured enclosing the first luminescent particle core (around a circumference and / or perimeter of the first luminescent particle core). Further, the first luminescent particle core may comprise, such as consist of, the luminescent material of the type M’XM2.

[0105] 2xAXg: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, at least comprising 50 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Especially, the first luminescent particle core may comprise, such as consist of, Na2(Si,Ti)F6:Mn4+, such as especially Na2SiF6:Mn4+.

[0106] Further, the first luminescent particle shell may comprise a material of the type M’XM2.2XAX6, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, x is in the range of < 1, wherein A comprises a tetraval ent cation, comprising one or 2025PF80119

[0107] 24

[0108] more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. In embodiments, M in the formula M’xM2-2xAX6 may comprise one or more of K, Na, and Rb. Especially, M may comprise Na. Alternatively, M may comprise, such as consist of, one or more of K and Rb, such as especially K. Hence, in embodiments, the first luminescent particle shell may comprise (K, Rb)2(Si, Ti)Xg, such as especially K2(Si,Ti)X6. Alternatively, the first luminescent particle shell may comprise Na2(Si,Ti)F6, such as especially Na2SiF6. In embodiments, the first luminescent particle shell may be (essentially) free from Mn4+. Alternatively, the (molar) concentration of Mn4+in the first luminescent particle shell may be at least 10 times, such as at least 50 times, especially at least 100 times, lower than the (molar) concentration of Mn4+in the first luminescent particle core. Further, the first luminescent particle shell may comprise Mn4+in a concentration of < 1 ppm, such as < 0.5 ppm, especially < 0.1 ppm, including (essentially) 0 ppm. Hence, in specific embodiments, the first luminescent material may comprise first luminescent particles, wherein the first luminescent particles may comprise a first luminescent particle core and a first luminescent particle shell, wherein: (A) the first luminescent particle shell may be configured enclosing the first luminescent particle core; (B) the first luminescent particle core may comprise the luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, at least comprising Na, x is in the range of < 1, wherein A comprises a tetraval ent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine; and (C) the first luminescent particle shell may comprise a material of the type M’xM2-2xAX6, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, at least comprising Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Such first luminescent particles may facilitate reducing the speed of degradation of the luminescent material of the type M’xM2-2xAX6: Mn4+in the first luminescent particle core. Especially, such a first luminescent particle shell may protect the luminescent material of the type M’XM2-2XAXg: Mn4+against air, moisture, etc., thereby improving the lifetime of said luminescent material.

[0109] In embodiments, the luminescent converter may comprise the first luminescent material (such as especially the luminescent material of the type M’xM2-2xAXe: Mn4+, wherein M at least comprises Na) in a first concentration Ci. Further, the luminescent converter may comprise the second luminescent material in a second concentration C2. In embodiments, Ci 2025PF80119

[0110] 25

[0111] > C2 may apply, such as C1> 1.1·C2, especially C1> 1.25*C2, like Ci > 1.5*C2, such as Ci > 1.75*C2. Such a difference in concentration may facilitate that the first device light may comprise relatively more first luminescent material light than second luminescent material light. Additionally or alternatively, in embodiments,

[0112]

[0113] Ci < may apply, such as Ci < 6*62, especially Ci < 5*C2, like Ci < 4*C2. Alternatively, in embodiments, C2 > Ci may apply, such as C2 > 1.1 *Ci, especially C2 > 1.25*Ci, like C2 > 1.5*Ci. Additionally or alternatively, in embodiments, C2 < 7*Ci may apply, such as C2 < 6*Ci, especially C2 < 5*Ci, like C2 < 4*Ci. Such a difference in concentration may facilitate that the first device light may comprise relatively more second luminescent material light than first luminescent material light.

[0114] In embodiments, the first luminescent material, the second luminescent material, and the third luminescent material may be configured evenly distributed throughout the luminescent converter. Alternatively, the first luminescent material, the second luminescent material, and the third luminescent material may be configured in a gradient within the luminescent converter (wherein the gradient may especially be along a direction of an optical axis of the first light source light within the luminescent converter). Yet, especially, the luminescent converter may comprise (a layer stack comprising) a first luminescent layer, a second luminescent layer, and (optionally) a third luminescent layer. In such embodiments, the first luminescent layer may comprise the first luminescent material. Especially, > 90 wt.%, such as > 95 wt.%, especially > 98 wt.%, including (essentially) 100 wt.%, of the first luminescent material may be configured in the first luminescent layer. Further, the second luminescent layer may comprise the second luminescent material.

[0115] Especially, > 90 wt.%, such as > 95 wt.%, especially > 98 wt.%, including (essentially) 100 wt.%, of the second luminescent material may be configured in the second luminescent layer.

[0116] Further, the third luminescent layer may comprise the third luminescent material. Especially, > 90 wt.%, such as > 95 wt.%, especially > 98 wt.%, including (essentially) 100 wt.%, of the third luminescent material may be configured in the third luminescent layer.

[0117] In alternative such embodiments, the luminescent converter may comprise (a layer stack comprising) a first luminescent layer and a second luminescent layer. The first luminescent layer may comprise the first luminescent material and the second luminescent material. Especially, > 90 wt.%, such as > 95 wt.%, especially > 98 wt.%, including (essentially) 100 wt.%, of the first luminescent material and the second luminescent material may be configured in the first luminescent layer. Further, the second luminescent layer may 2025PF80119

[0118] 26

[0119] comprise the third luminescent material. Especially, > 90 wt.%, such as > 95 wt.%, especially > 98 wt.%, including (essentially) 100 wt.%, of the third luminescent material may be configured in the second luminescent layer.

[0120] Hence, in specific embodiments, the first luminescent layer may be configured upstream of the second luminescent layer. If present, the third luminescent layer may be configured downstream of the first luminescent layer and the second luminescent layer.

[0121] Such a layer stack may facilitate that the second luminescent layer may protect the first luminescent material against air and / or moisture. Alternatively, would the first luminescent layer be configured downstream of the second luminescent layer, the second luminescent layer may protect the first luminescent material against high-intensity (blue) first light source light, thereby reducing photodegradation in the first luminescent material.

[0122] In embodiments, the light generating system (comprising the first light generating device) may be configured to generate system light. The system light may comprise the first device light. In specific embodiments, the system light may (essentially) consist of the first device light. Alternatively, the system light may comprise contributions from further light generating means (see also below). The system light may have a system centroid wavelength (λcc). In embodiments, as indicated above, the first device light may be white light, wherein the system light may (essentially) consist of the first device light. That is, in embodiments, the system light may be white light.

[0123] The light generating system may thus comprise a further light generating device. The further light generating device may especially be configured to generate further device light. In embodiments, the further device light may be selected from the group of red light, orange light, yellow light, green light, blue light, violet light, and white light, such as especially from the group of green light, blue light, and red light.

[0124] In embodiments, the light generating system may comprise a control system. The control system may be configured to individually control the first light generating device and the further light generating device. Especially, the control system may be configured to control one or more of a spectral power distribution, an intensity, a color, a CCT, and a CRI of the system light (by individually controlling the first light generating device and the further light generating device). The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein the term “controlling” and similar terms may include imposing behavior on an element and / or monitoring the element. The controlling of the element can be done with a control system. The control system and the element may thus at least temporarily, or permanently, 2025PF80119

[0125] 27

[0126] functionally be coupled. The element may comprise the control system. The control system and element may not be physically coupled. Control can be done via wired and / or wireless control. A control system may comprise or may be functionally coupled to a user interface. The control system may also be configured to receive and execute instructions from a remote control. The control system may be controlled via an App on a device, such as a portable device. In such embodiments the control system of the lighting system may be a slave control system. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology. The control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme.

[0127] Further, in embodiments, the light generating system may comprise a LED package. The term “LED package” may refer to a housing comprising a solid state light source (e.g. a semiconductor chip) and one or more further (optical and / or electrical) components, such as a luminescent converter, a reflector, a carrier, one or more optical elements (e.g. a lens, a dome, a diffuser, etc.), electrical connective elements (e.g. wiring), a heat sink, a Zener diode, etc.. Especially, the LED package (of the light generating system) may comprise the first light generating device (i.e., the LED package may at least comprise the first solid state light source and the luminescent converter). Further, the LED package (of the light generating system) may comprise the further light generating device. Optionally, the LED package (of the light generating system) may further comprise one or more of a reflector, a carrier, one or more optical elements (e.g. a lens, a dome, a diffuser, etc.), electrical connective elements (e.g. wiring), a heat sink, a Zener diode, and one or more further optical and / or electrical components. In embodiments, the LED package may at least comprise a reflective cup.

[0128] The term “LED package” may in general language usage also be indicated as simply “LED”. That is, in general language usage, the term “LED” may be used to refer to a LED package. In embodiments, a LED package may comprise a solid state light source (e.g. a semiconductor chip) configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED. Such an LED (package), which may not comprise a luminescent material, may be indicated as a direct-color LED (dc-LED). Alternatively, the LED package may comprise a solid state light source configured to provide primary radiation, wherein at least part of the primary radiation may be converted into secondary radiation (e.g. by a luminescent material) within the LED package. Such an LED (package) 2025PF80119

[0129] 28

[0130] may especially be indicated as a phosphor converted LED or pc-LED. Herein, the LED package (comprising the first light generating device) may especially be based on the conversion of first light source light by a (first and second) luminescent material.

[0131] In embodiments, a LED package may comprise multiple sub-packages, wherein each sub-package may be a LED package as described above. Hence, the light generating system may comprise a LED package comprising the first light generating device and one or more further light generating devices. In such embodiments, as indicated above, each of the first light generating device and the one or more further light generating devices may be configured as a (separate) LED package, wherein the (separate) LED packages may together form a (larger) LED package. Hence, a LED package may comprise one or more LED (sub-)packages. Alternatively, a LED package may comprise one or more compartments, wherein each compartment may comprise a light generating device (wherein the light generating device on its own may not be configured as a LED package). Hence, the light generating system may comprise a LED package comprising the first light generating device and one or more further light generating devices. Especially, the light generating system may comprise a LED package comprising the first light generating device, a second light generating device, a third light generating device and a fourth light generating device.

[0132] The second light generating device (of the LED package) may comprise a second solid state light source. The second solid state light source may be selected from the group comprising an LED, a laser diode, a superluminescent diode, and a (stacked) multijunction light emitting diode, though other options may also be possible (see below). Further, the second solid state light source may be configured to generate second light source light. The second light source light may 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 second light source light may be violet light or 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 second solid state light source. Further, the second luminescent converter may comprise a fourth luminescent material. The fourth luminescent material may comprise any (combination) of the luminescent materials indicated above. In specific embodiments, the fourth luminescent material may comprise a luminescent material of the type M’xM2-2xAXe: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, x is in the range of < 1, wherein A comprises a tetraval ent cation, comprising one or more of silicon, titanium, germanium, tin, zinc, zirconium, and hafnium, 2025PF80119

[0133] 29

[0134] and wherein X comprises a monovalent anion, at least comprising fluorine. Alternatively or additionally, the fourth luminescent material may comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials and divalent europium comprising nitride luminescent materials. The fourth luminescent material may be configured to convert at least part of the second light source light received by the fourth luminescent material into fourth luminescent material light. Further, the fourth luminescent material may be configured to convert at least part of the second light source light received by the second luminescent converter into fourth luminescent material light. Especially, the fourth luminescent material may be configured to convert > 85%, such as > 90%, especially > 95%, including (essentially) 100%, of (a spectral power of) the second light source light received by the second luminescent converter into fourth luminescent material light. The fourth luminescent material light may have a fourth centroid wavelength (λc4). Especially, the fourth centroid wavelength (λc4) may be selected from the range of 590-670 nm, such as from the range of 600-660 nm, especially from the range of 600-650 nm. Hence, the fourth luminescent material light may be red light or orange light, such as especially red light. Further, the second light generating device may be configured to generate second device light. The second device light may comprise the fourth luminescent material light. Further, in embodiments, the second light generating device light may comprise the second light source light. Yet, especially, the second device light may (essentially) consist of the fourth luminescent material light. The second device light may have a second device centroid wavelength (λcd2). The second device centroid wavelength (λcd2) may be selected from the range of 590-670 nm, such as from the range of 600-660 nm, especially from the range of 600-650 nm. That is, the second device light may be red light or orange light, such as especially red light.

[0135] The third light generating device (of the LED package) may comprise a third solid state light source. The third solid state light source may be selected from the group comprising an LED, a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). Further, the third solid state light source may be configured to generate third light source light. The third light source light may 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 400-470 nm. Hence, the third light source light may be violet light or blue light, such as especially blue light. Further, the third light generating device may comprise a third luminescent converter. The third luminescent converter may be configured as a coating on (top of) the third solid 2025PF80119

[0136] 30

[0137] state light source. Further, the third luminescent converter may comprise a fifth luminescent material. The fifth luminescent material may comprise any (combination) of the luminescent materials indicated above. In specific embodiments, the fifth 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. The fifth luminescent material may be configured to convert at least part of the third light source light received by the fifth luminescent material into fifth luminescent material light. Further, the fifth luminescent material may be configured to convert at least part of the third light source light received by the third luminescent converter into fifth luminescent material light. Especially, the fifth luminescent material may be configured to convert > 85%, such as > 90%, especially > 95%, including (essentially) 100%, of (a spectral power of) the third light source light received by the third luminescent converter into fifth luminescent material light. The fifth luminescent material light may have a fifth centroid wavelength (λc5).

[0138] Especially, the fifth centroid wavelength (λc5) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-570 nm. Hence, the third luminescent material light may be green light or yellow light, such as especially green light. Further, the third light generating device may be configured to generate third device light. The third device light may comprise the fifth luminescent material light. Further, in embodiments, the third device light may comprise the third light source light. Yet, especially, the third device light may (essentially) consist of the fifth luminescent material light. The third device light may have a third device centroid wavelength (λcd3). The third device centroid wavelength (λcd3) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-590 nm. That is, the second device light may be green light or yellow light, such as especially green light. In embodiments, λcd2- λcd3≥ 15 nm may apply, such as λcd2- λcd3≥ 25 nm, especially λcd2- λcd3≥ 35 nm. Additionally or alternatively, in embodiments, λcd2- λcd3≤ 150 nm may apply, such as λcd2- λcd3≤ 140 nm, especially λcd2- λcd3≤ 130 nm.

[0139] Further, the LED package may comprise a fourth light generating device. The fourth light generating device may comprise a fourth solid state light source. The fourth solid state light source may be selected from the group comprising an LED, a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). Further, the fourth solid state light source may be configured to generate fourth light source light. The fourth light source light may have a fourth peak emission wavelength (λp4) selected from the range of 380-500 nm, such as from 2025PF80119

[0140] 31

[0141] the range of 400-490 nm, especially from the range of 430-490 nm, like from the range of 440-470 nm. Hence, the fourth light source light may be one of violet light and blue light, such as especially blue light. The fourth light generating device may be configured to generate fourth device light. The fourth device light may comprise the fourth light source light. In specific embodiments, the fourth device light may (essentially) consist of the fourth light source light. In such embodiments, the fourth light generating device may comprise a light transparent coating, configured on top of (and in physical contact with) a light escape surface of the fourth 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 fourth light source light. The light scattering material may comprise light scattering particles, such as e.g. at least one of BaSO4, A12O3and TiO2particles. Further, the fourth device light may have a fourth device centroid wavelength (Xca4). In embodiments, the fourth device centroid wavelength (λcd4) may be selected from the range of 380-500 nm, such as from the range of 400-490 nm, especially from the range of 430-490 nm, like from the range of 440-470 nm. Hence, the fourth device light may be violet light or blue light, such as especially blue light. In embodiments, λcd3 – λcd4 ≥ 15 nm may apply, such as λcd3 – λcd4 ≥ 25 nm, especially λcd3 – λcd4 ≥ 35 nm.

[0142] Additionally or alternatively, in embodiments, λcd3 – λcd4 ≤ 120 nm may apply, such as λcd3 – λcd4 ≤ 110 nm, especially λcd3 – λcd4 ≤ 100 nm.

[0143] In embodiments, in an operational mode of the light generating system, 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, the third device light, and the fourth device light. In embodiments, the system light may be colored light, such as selected from the group of violet light, 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. Hence, in at least one operational mode of the light generating system (comprising the LED package), the system light may be white light. The (white) system light 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 2025PF80119

[0144] 32

[0145] color rendering index (CRI) of at least 75, such as at least 80, especially at least 85. The system light may further have a (CRI) R9 score of at least 60, such as at least 65, especially at least 70.

[0146] Yet, in a further operational mode, the system light may be one of orange light and red light, such as especially red light. In such embodiments, the system light may especially comprise the second device light. Hence, in at least one operational mode of the light generating system (comprising the LED package), the system light may be red light (comprising the second device light). Additionally or alternatively, the system light may be one of green light and yellow light, such as especially green light. In such embodiments, the system light may especially comprise the third device light. Hence, in at least one operational mode of the light generating system (comprising the LED package), the system light may be green light (comprising the third device light). Additionally or alternatively, the system light may be one of violet light and blue light, such as especially blue light. In such embodiments, the system light may especially comprise the fourth device light. Hence, in at least one operational mode of the light generating system (comprising the LED package), the system light may be blue light (comprising the fourth device light).

[0147] As indicated above, 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, and the third light generating device. Especially, the control system may be configured to control a spectral power distribution of the system light in the wavelength range of 380-780 nm by (individually) controlling the first light generating device, the second light generating device, and the third light generating device. The control system may further be configured to control one or more of a spectral power distribution, color point, CCT, CRI, and intensity of the system light (by controlling the first, second, third, and fourth light generating devices). Hence, in specific embodiments, the light generating system may comprise a LED package and a control system, wherein the LED package may comprise the first light generating device, a second light generating device, a third light generating device and a fourth light generating device, wherein: (A) the second light generating device may comprise a second solid state light source, wherein the second light generating device may be configured to generate second device light having a second device centroid wavelength (λcd2) selected from the range of 600-660 nm; (B) the third light generating device may comprise a third solid state light source, wherein the third light generating device may be configured to generate third device light having a third device centroid wavelength (λcd3) selected from the range of 500-590 nm; wherein λcd2 – λcd3 ≥ 25 2025PF80119

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[0149] nm; (C) the fourth light generating device may comprise a fourth solid state light source, wherein the fourth light generating device may be configured to generate fourth device light having a fourth device centroid wavelength (λcd4) selected from the range of 430-490 nm; wherein λcd3 – λcd4 ≥ 25 nm; (D) in an operational mode of the light generating system, the light generating system may be configured to generate system light comprising one or more of the first device light, the second device light, the third device light, and the fourth device light; and (E) 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 fourth light generating device; wherein the control system may be configured to control a spectral power distribution of the system light in the wavelength range of 380-780 nm by controlling the first light generating device, the second light generating device, and the third light generating device. Such a light generating system may especially be able to provide both white light suitable for general lighting, as well as colored light for e.g. mood lighting or decorative lighting. Further, a light generating system comprising a LED package may be relatively compact, as the light generating devices may share e.g. a heat sink and / or electronics.

[0150] Especially, the system light may comprise the first device light and one or more of the second, third, and fourth device light, wherein the system light may be white light. Alternatively, the system light may comprise the first device light and one or more of the second, third, and fourth device light, wherein the system light may be colored light. Further, the system light may comprise at least two of the second, third, and fourth device light (and (essentially) not comprise the first device light), wherein the system light may be white light. Alternatively, the system light may comprise one or more of the second, third, and fourth device light (and (essentially) not comprise the first device light), wherein the system light may be colored light.

[0151] In embodiments, 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 fourth light generating device. Especially, the control system may be configured to control a spectral power distribution of the system light in the wavelength range of 380-780 nm by (individually) controlling the first light generating device, the second light generating device, the third light generating device, and the fourth light generating device. The control system may further be configured to control one or more of a spectral power distribution, color point, CCT, CRI, and intensity of the system light (by controlling the first, second, third, and fourth light generating devices). 2025PF80119

[0152] 34

[0153] In embodiments, the light generating system(, especially the first light generating device,) may comprise a Chip-on-Board (CoB). The term “CoB” may especially refer to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of light emitting semiconductor light sources may be configured on the same substrate. Especially, a CoB may be a multi-LED chip configured together as a single lighting module. In embodiments, the Chip-on-Board (CoB) of the light generating system may comprise a plurality of the first solid state light source. Especially, the CoB may comprise > 2, such as > 3, especially > 4, first solid state light sources. Additionally or alternatively, the CoB may comprise < 200, such as < 150, especially < 100, first solid state light sources. Further, the CoB may comprise the luminescent converter. The luminescent converter may especially be configured on top of (and at least partially enclosing) the plurality of first solid state light sources. That is, the luminescent converter may be configured as a coating. In embodiments, the control system may be configured to individually control the plurality of first solid state light sources.

[0154] Hence, in specific embodiments, the light generating system may comprise a Chip-on-Board (CoB), wherein the Chip-on-Board (CoB) may comprise (i) a plurality of the first solid state light source, and (ii) the luminescent converter, wherein the luminescent converter may be configured on top of the plurality of first solid state light sources. A CoB may be relatively compact. Further, a CoB may comprise the plurality of first solid state light sources directly mounted on a substrate, thereby facilitating that no additional mounting elements are needed to mount the plurality of first solid state light sources on the substrate.

[0155] (Additionally or) alternatively, the light generating system (especially the first light generating device) may comprise a LED filament. LED filaments as such are known, and are e.g. described in US8400051B2, W02020016058, WO2019197394, which are herein incorporated by reference. In general, a LED filament may comprise (i) a plurality of LEDs, arranged on (at least a first major surface of) an elongated carrier, and (ii) an elongated encapsulant covering the plurality of LEDs and at least part of the elongated carrier. The LED filament may in embodiments be defined by a filament length LF, a filament width WF, and a filament thickness TF. Further, the LED filament may have relatively high aspect ratios (LF / WF or LF / TF), such as > 10, especially > 15, such as > 20, more especially > 50. Large aspect ratios may better mimic a filament. The LED filament may be straight or the LED filament may be curved, such as having a (2D or 3D) spiraling shape, (like) a helical shape, or another curved shape. 2025PF80119

[0156] 35

[0157] As indicated, the LED filament may comprise an elongated carrier, solid state light sources, and an encapsulant. Especially, the elongated carrier may support the solid state light sources. The elongated carrier may e.g. comprise glass, quartz, metal, or sapphire. In other embodiments, the elongated carrier may e.g. comprise a polymeric material or (flexible) metal, e.g., a film or foil. The elongated carrier may be rigid (self-supporting), but may (in polymeric embodiments) also be flexible. In embodiments, the (elongated) carrier may comprise a first major surface at a first side of the carrier and a second major surface at a second side of the carrier, opposite to the first side. In embodiments, the solid state light sources may be arranged on at least one of these surfaces. Hence, in embodiments, at least part of, such as all of, the solid state light sources may be mounted onto the first major surface. Additionally or alternatively, at least part of the solid state light sources may be mounted onto the second major surface. Hence, in embodiments, the solid state light sources may be arranged, mounted and / or mechanically coupled on / to the carrier, wherein the carrier may especially be configured to mechanically and / or electrically support the LEDs.

[0158] In embodiments, the solid state light sources may comprise one or more of LEDs, laser diodes, superluminescent diodes, and stacked multi -junction light emitting 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), especially over (at least part of) the filament length LF. The number of solid state light sources in the array may be > 4, such as > 8, especially > 12. In embodiments, the number of solid state light sources in the array may be selected from the range of 10-2000, such as from the range of 10-1500, especially from the range of 10-1000. In embodiments, the solid state light sources may be configured in a ID (linear) array over at least part of the filament length LF.

[0159] The LED filament may comprise an encapsulant. The encapsulant may (at least partly) cover the plurality of solid state light sources. Further, the encapsulant may (at least partly) cover at least part of the elongated carrier, such as at least (part of) one of the first major surface and the second major surface. In general, the encapsulant may be in contact with the elongated carrier and may cover all of the solid state light sources. Hence, in embodiments the encapsulant may be configured over at least part of the filament length LF (such as over > 70% of the filament length LF). In embodiments, the encapsulant may comprise one or more of a luminescent material and a light scattering material. The one or more of the luminescent material and the light scattering material may especially be configured embedded in an encapsulant material, e.g. a (flexible) polymer material (such as a silicone). Especially, the encapsulant may comprise the luminescent converter (of the first 2025PF80119

[0160] 36

[0161] light generating device). Alternatively, the luminescent converter may be configured as an encapsulant. In embodiments, the (optional) light scattering material may be configured to scatter (or “diffuse”) the light source light, especially in a direction transverse to a normal of the (first and / or second) major surface. In specific embodiments, the light scattering material may comprise light scattering particles, such as e.g. at least one of BaSO4, A12O3and TiO2particles.

[0162] Hence, the light generating system (especially the first light generating device) may comprise a LED filament. The LED filament may comprise a plurality of the first solid state light source arranged on an elongated carrier (see also above). Further, the LED filament may comprise an elongated encapsulant configured in physical contact with and covering the plurality of first solid state light sources and at least part of the elongated carrier. In embodiments, the elongated encapsulant may comprise the luminescent converter.

[0163] Alternatively, the luminescent converter may be configured as the elongated encapsulant. In embodiments, the control system may be configured to individually control the plurality of first solid state light sources. Hence, in specific embodiment, the light generating system may comprise a LED filament, wherein the LED filament may comprise (i) a plurality of the first solid state light source arranged on an elongated carrier, and (ii) an elongated encapsulant configured in physical contact with and covering the plurality of first solid state light sources and at least part of the elongated carrier; wherein the elongated encapsulant may comprise the luminescent converter. A LED filament may be suitable for light bulb applications, as a LED filament may better mimic a filament of an incandescent light bulb. Further, especially flexible LED filaments may be used in decorative lighting applications, to provide lighting solutions with various (adjustable) decorative shapes.

[0164] (Additionally or) alternatively, the light generating system(, especially the first light generating device,) may comprise a LED strip. Hence, in specific embodiment, the light generating system may comprise a LED strip, wherein the LED strip may comprise (i) a plurality of the first solid state light source arranged on an elongated carrier, and (ii) an elongated encapsulant covering the plurality of first solid state light sources and at least part of the elongated carrier; wherein the first elongated encapsulant may comprise the luminescent converter. A LED strip may especially provide light from one side of the elongated carrier. Hence, a LED strip may be especially suitable for applications wherein the light generating system (such as the first light generating device) may be mounted on an opaque surface (e.g. a housing, a wall, a ceiling, a frame etc.). 2025PF80119

[0165] 37

[0166] Some general embodiments relating to the light source will be provided next. These embodiments may relate to one or more of the first solid state light source, the second solid state light source, the third solid state light source, and the fourth solid state light source. The term “light source” may in principle relate to any light source known in the art. In a specific embodiment, the light source may comprise an LED. The term “light source” may also relate to a plurality of (essentially identical or different) light sources, such as 2-2000 (LED) light sources. The phrase “different light sources”, and similar phrases, may refer to a plurality of solid-state light sources selected from at least two different bins.

[0167] Likewise, the phrase “identical light sources”, and similar phrases, may refer to a plurality of solid-state light sources selected from the same bin. Hence, the term LED may also refer to a plurality of LEDs. Further, the term “light source” may also refer to a so-called chip-on-board (CoB) light source. The term “light source” may also refer to a chip scale package (CSP) and / or a chip scale packaged (CSP) LED. A CSP may comprise a single solid state die (such as a LED) with provided thereon a luminescent material comprising layer. The term “light source” may also refer to a midpower package. A midpower package may comprise one or more solid state die(s). The die(s) may be covered by a luminescent material comprising layer. The die dimensions may be equal to or smaller than 2 mm, such as in the range of e.g. 0.2-2 mm. Herein, the term “light source” may also especially refer to a small solid state light source, such as having a mini size or micro size. For instance, the light sources may comprise one or more of mini LEDs and micro LEDs, such as especially micro LEDs or “microLEDs” or “pLEDs”. Herein, the term mini size or mini LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm - 1 mm. Herein, the term p size or micro LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm and smaller.

[0168] The light source may have a light escape surface. For LEDs it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapes from the light source. The light source is configured to provide a beam of light. This beam of light (thus) escapes from the light exit surface of the light source.

[0169] The term “light source” may refer to a semiconductor light-emitting device, such as an LED, a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix 2025PF80119

[0170] 38

[0171] (AMOLED). In an embodiment, the light source comprises a LED. The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). Especially, the term “solid state light source” may refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, a superluminescent diode, or a multi-junction diode.

[0172] In embodiments, the light source may be a dc-LED. Alternatively, the light source may be a pc-LED. Hence, the term “light source” may refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more optics, like a lens, a collimator. In embodiments, the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light source. In specific embodiments, the light source may be selected from the group of laser diodes and superluminescent diodes. In other embodiments, the light source may comprise an LED or multi -junction (light emitting) diode. The light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution. The light source light may in embodiments comprise one or more bands, having band widths as known for lasers.

[0173] The term “laser light source” especially refers to a laser. Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the wavelength range of 200-2000 nm, such as from the wavelength range of 300-1500 nm. The term “laser” especially refers to a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Especially, the term “laser” may refer to a solid-state laser. In specific embodiments, the terms “laser” or “laser light source”, or similar terms, may refer to a laser diode (or diode laser). Hence, in embodiments the light source comprises a laser light source. In embodiments, the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of a semiconductor laser diodes, such as GaN, InGaN, AlGalnP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc. The term “solid state material laser”, and similar terms, may thus refer to a solid state laser like based on a crystalline or glass body dopes with ions, like transition metal ions and / or lanthanide ions, to a fiber laser, to a photonic crystal laser, to a semiconductor laser, etc.

[0174] 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 2025PF80119

[0175] 39

[0176] 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 (e.g. a torch), automotive lighting devices, stage-lighting devices, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems.

[0177] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc.. The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. The lamp may be a portable lamp, such as a torch. In yet a further aspect, the invention also provides a projector device comprising the light generating system as defined herein. Especially, a projector 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 projector device may include one or more light generating systems such as described herein. Further, the invention may provide one or more of a disinfection device, a photochemical reactor, an automotive lighting device, and an optical wireless communication device, comprising the light generating system as defined herein. Further, the invention may provide a lighting fixture, comprising the light generating system as defined herein. Hence, according to a second aspect, the invention provides a lighting device selected from the group of a lamp, a luminaire, a lighting fixture, a projector device, a stage lighting device, and an automotive lighting 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.

[0178] Hence, in a further aspect, the invention also provides (a lighting device selected from the group of) a lighting fixture comprising the light generating system as defined herein. Hence, in yet a further aspect, the light generating system may comprise a lighting device selected from the group of a lamp, a luminaire, and a lighting fixture, wherein the lamp, luminaire, or lighting fixture may comprise one or more elements of the light generating system, such as the solid state light sources and the luminescent converters, and the light generating system may further comprise e.g. the control system configured to control the device. 2025PF80119

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

[0181] 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.

[0182] BRIEF DESCRIPTION OF THE DRAWINGS

[0183] 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:

[0184] Fig. 1 schematically depicts an embodiment of the light generating system; Figs. 2A-2B schematically depict embodiments of the light generating system comprising a layer stack;

[0185] Fig. 3 schematically depicts an embodiment of a first luminescent particle; Fig. 4 schematically depicts an embodiment of the first luminescent material light;

[0186] Fig. 5 schematically depicts an embodiment of the light generating system comprising a LED package;

[0187] Fig. 6 schematically depicts an embodiment of the light generating system comprising a Chip-on-Board or a LED filament; and

[0188] Fig. 7 schematically depicts an embodiment of the lighting device. The schematic drawings are not necessarily to scale.

[0189] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0190] Fig. 1 schematically depicts an embodiment of the light generating system 1000. The light generating system 1000 may comprise a first light generating device 110. Further, the first light generating device 110 may comprise a first solid state light source 10 2025PF80119

[0191] 41

[0192] and a luminescent converter 2000. The first solid state light source 10 may be configured to generate first light source light 11 having a first peak emission wavelength (λp1) selected from the range of 420-490 nm. Further, the luminescent converter 2000 may be configured in a light receiving relationship with the first solid state light source 10. The luminescent converter 2000 may especially comprise a first luminescent material 210, a second luminescent material 220, and a third luminescent material 230. The first luminescent material 210 may consist of a luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Further, the first luminescent material 210 may be configured to convert part of the first light source light 11 received by the first luminescent material 210 into first luminescent material light 211. The first luminescent material light 211 may have a first centroid wavelength (λc₁ ) selected from the range of 610-650 nm. Further, the first luminescent material light 211 may comprise at least one emission band having a first full width at half maximum FWHMi of < 50 nm. The second luminescent material 220, different from the first luminescent material 210, may be configured to convert part of the first light source light 11 received by the second luminescent material 220 into second luminescent material light 221. Especially, the second luminescent material light 221 may have a second centroid wavelength (λc2) selected from the range of 600-660 nm. The third luminescent material 230 may be configured to convert part of the first light source light 11 received by the third luminescent material 230 into third luminescent material light 231. Especially, the third luminescent material light 231 may have a third centroid wavelength (λc3) selected from the range of 500-580 nm. Further, the first light generating device 110 may be configured to generate first device light 111. The first device light 111 may comprise non-converted first light source light 11’, the first luminescent material light 211, the second luminescent material light 221, and the third luminescent material light 231. Further, the first device light 111 may have a spectral power distribution, wherein (i) xo% of the spectral power in the wavelength range of 380-780 nm is provided by the non-converted first light source light 11’, (ii) xi% of the spectral power in the wavelength range of 380-780 nm is provided by the first luminescent material light 211, (iii) X2% of the spectral power in the wavelength range of 380-780 nm is provided by the second luminescent material light (221), and (iii) X3% of the spectral power in the wavelength range of 380-780 nm is provided by the third luminescent material light (231). In embodiments, 40% > xo > 4% 2025PF80119

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[0194] and 20% > xi > 4% may apply. Additional, in embodiments, X2 + X3 > xi may apply. The first device light 111 may be white light having a correlated color temperature in a range from 2000K to 6500K and a color rendering index of at least 80.

[0195] The luminescent converter 2000 may comprise the first luminescent material 210 (especially the luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M comprises at least 50 mole% Na) in a first concentration Ci and the second luminescent material 200 in a second concentration C2. Especially, in embodiments, Ci > 1.5*C2may apply.

[0196] The light generating system 1000, such as especially the first light generating device 110, may be configured as a LED package 500. The LED package 500 may thus comprise the first solid state light source 10 and the luminescent converter 2000. Further, the LED package 500 may comprise a thermally conductive substrate or holder 520. The thermally conductive substrate or holder 520 may comprise a reflective coating or reflective layer 510 configured facing the first solid state light source 10 and the luminescent converter 2000. Hence, especially, the thermally conductive substrate or holder 520 may be a reflective cup.

[0197] Figs. 2A-2B schematically depict further embodiments of the light generating system 1000. In Fig. 2A, the luminescent converter 2000 comprises (a layer stack 800 comprising) a first luminescent layer 2100, a second luminescent layer 2200, and third luminescent layer 2300. One of the first luminescent layer 2100 and the second luminescent layer 2200 may be configured downstream from the other of the first luminescent layer 2100 and the second luminescent layer 2200. Further, the first luminescent layer 2100 may comprise the first luminescent material 210. Additionally, the second luminescent layer 2200 may comprise the second luminescent material 220. Further, the third luminescent layer 2300 may comprise the third luminescent material 230. In Fig. 2B, the luminescent converter 2000 may comprise (a layer stack 800 comprising) a first luminescent layer 2100 and a second luminescent layer 2200. The first luminescent layer 2100 may be configured upstream from the second luminescent layer 2200. Further, the first luminescent layer 2100 may comprise the first luminescent material 210 and the second luminescent material 220. Additionally, the second luminescent layer 2200 may comprise the third luminescent material 230.

[0198] Fig. 3 schematically depicts an embodiment of the first luminescent material 210. The first luminescent material 210 may comprise first luminescent particles 2110. (Each of) the first luminescent particles 2110 may comprise a first luminescent particle core 2111 and a first luminescent particle shell 2112. Especially, the first luminescent particle shell 2025PF80119

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[0200] 2112 may be configured enclosing the first luminescent particle core 2111. Further, the first luminescent particle core 2111 may comprise the luminescent material of the type M’XM2-2xAXe: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Additionally, the first luminescent particle shell 2112 may comprise a material of the type M’xM2-2xAX6, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, (wherein M comprises at least 50 mole% Na,) x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Hence, the first luminescent particle shell 2112 may comprise a similar material to the first luminescent particle core 2111, wherein the first luminescent particle shell 2112 may be (essentially) free from Mn4+.

[0201] Fig. 4 schematically depicts an embodiment of the first luminescent material light 211 and the second luminescent material light 221. The first luminescent material 210 may comprise Na₂(Si, Ti)F₆: Mn4+(such as especially Na₂SiF₆: Mn4+), and the second luminescent material 220 may comprise K₂(Si, Ti)F₆: Mn4+(such as especially K₂SiF₆: Mn4+). Further, in embodiments, 0.5 ≤ x1 / x2≤ 1.2 may apply. As can be seen in Fig. 4, the first luminescent material light 211 may have an additional peak at -620 nm, where the second luminescent material light 221 may have a relatively low emission intensity. Hence, the first luminescent material light 211 may “fill up” a hole in the emission spectrum of the second luminescent material light 221. Further, an emission peak at -620 nm may provide an improved overlap between the first luminescent material light 211 and the spectral sensitivity curve of the human eye (for red light), thereby increasing the luminous efficacy of radiation (LER) for system light 1001 comprising the first luminescent material light 211 compared to system light 1001 comprising the second luminescent material light 221.

[0202] Fig. 5 schematically depicts an embodiment of the light generating system 1000 comprising a LED package 500. The LED package 500 may comprise the first light generating device 110 and a further light generating device 100. The further light generating device 100 may especially be configured to generate further device light 101. Further, the further device light 101 may be selected from the group of red light, green light, blue light, and white light. In an operational mode of the light generating system 1000, the light generating system 1000 may be configured to generate system light 1001 comprising the first 2025PF80119

[0203] 44

[0204] device light 111 and the further device light 101. Especially, the system light 1001 may be white light with a CCT selected from the range of 1500-8000 K or may be colored light.

[0205] Further, the light generating system 1000 may comprise the LED package 500 and a control system 300. The LED package 500 may comprise the first light generating device 110, a second light generating device 120, a third light generating device 130, and a fourth light generating device 140. The second light generating device 120 may comprise a second solid state light source 20. The second light generating device 120 may especially be configured to generate second device light 121 having a second device centroid wavelength (λcd2) selected from the range of 600-660 nm. Hence, the second device light 121 may be red light. Further, the third light generating device 130 may comprise a third solid state light source 30. The second light generating device 120 may especially be configured to generate third device light 131 having a third device centroid wavelength (λcd3) selected from the range of 500-590 nm. In embodiments, λcd2- λcd3≥ 25 nm may apply. Further, the third device light 131 may be green light. The fourth light generating device 140 may comprise a fourth solid state light source 40. Additionally, the fourth light generating device 140 may be configured to generate fourth device light 141 having a fourth device centroid wavelength (λcd4) selected from the range of 430-490 nm. In embodiments, λcd3- λcd4≥ 25 nm may apply. Further, the fourth device light 141 may be blue light. In an operational mode of the light generating system 1000, the light generating system 1000 may be configured to generate system light 1001 comprising one or more of the first device light 111, the second device light 121, the third device light 131, and the fourth device light 141. The control system 300 may be configured to individually control the first light generating device 110, the second light generating device 120, the third light generating device 130, and the fourth light generating device 140. Especially, the control system 300 may be configured to control a spectral power distribution of the system light 1001 in the wavelength range of 380-780 nm by controlling the first light generating device 110, the second light generating device 120, the third light generating device 130, and the fourth light generating device 140 (wherein the system light may have a color point selected from the CIE 1931 color space).

[0206] The second solid state light source 20 may be configured to generate second light source light 21 having a second peak emission wavelength (λp2) selected from the range of 380-490 nm. Further, the second light generating device 120 may comprise a second luminescent converter 2020. The second luminescent converter 2020 may comprise a fourth luminescent material 240. The fourth luminescent material 240 may especially be configured to convert part of the second light source light 21 received by the fourth luminescent material 2025PF80119

[0207] 45

[0208] 240 into fourth luminescent material light 241. The fourth luminescent material light 241 may have a fourth centroid wavelength (XC4) selected from the range of 600-660 nm. Further, the second device light 121 may comprise the fourth luminescent material light 241.

[0209] The third solid state light source 30 may be configured to generate third light source light 31 having a third peak emission wavelength (λp3) selected from the range of 380-490 nm. Further, the third light generating device 130 may comprise a third luminescent converter 2030. The third luminescent converter 2030 may comprise a fifth luminescent material 250. The fifth luminescent material 250 may especially be configured to convert part of the third light source light 31 received by the fifth luminescent material 250 into fifth luminescent material light 251. The fifth luminescent material light 251 may have a fifth centroid wavelength (λc5) selected from the range of 490-590 nm. Further, the third device light 131 may comprise the fifth luminescent material light 251. The LED package 500 may further comprise a fourth light generating device 140. The fourth light generating device 140 may comprise a fourth solid state light source 40. The fourth solid state light source 40 may be configured to generate fourth light source light 41 having a fourth peak emission wavelength (λp4) selected from the range of 430-490 nm. For clarity, the first, second, third, and fourth solid state light sources 10,20,30,40 are indicated with dashed lines in Fig. 5. The light generating system 1000 may comprise the control system 300. The control system 300 may especially be configured to individually control the first light generating device 110, the second light generating device 120, the third light generating device 130, and the fourth light generating device 140.

[0210] Fig. 6 schematically depicts a further embodiment of the light generating system 1000. The light generating system 1000 (especially the first light generating device 110) may comprise a Chip-on-Board 600. The Chip-on-Board 600 may comprise a plurality of the first solid state light source 10 (arranged on a first major surface 51 of a carrier 5). Further, the Chip-on-Board 600 may comprise the luminescent converter 2000. The luminescent converter 2000 may especially be configured on top of the plurality of first solid state light sources 10. As indicated above, the plurality of first solid state light sources 10 of the Chip-on-Board 600 may be configured (only) on a first major surface 51 of a carrier 5. Hence, the Chip-on-Board 600 may (essentially) not comprise the first solid state light sources 10 and (the part of) the luminescent converter 2000 indicated with dashed lines.

[0211] Alternatively, the light generating system 1000 (especially the first light generating device 110) may comprise a LED filament 400. The LED filament 400 may comprise a plurality of the first solid state light source 10 arranged on an elongated carrier 5. 2025PF80119

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[0213] Further, the LED filament 400 may comprise 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. The elongated encapsulant 410 may especially comprise the luminescent converter 2000. The plurality of first solid state light sources 10 of the LED filament 400 may be configured on one or more of a first major surface 51 and a second major surface 52 of the elongated carrier 5. Hence, the LED filament 400 may comprise the first solid state light sources 10 and (the part of) the elongated encapsulant 410 indicated with dashed lines.

[0214] Fig. 7 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 of the light generating system 1000. Fig. 7 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Reference 3 indicates a projector device, which may also comprise the light generating system 1000. Reference 4 indicates an automotive lighting device, which may also comprise the light generating system 1000. Hence, Fig. 7 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, a lighting fixture, a projector device 3, and an automotive lighting device 4, comprising the light generating system 1000 as described herein. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of (such as be) system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor and reference 1310 to a ceiling; reference 1307 refers to a wall.

[0215] The term “plurality” refers to two or more. The terms “substantially” or “essentially”, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein 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 2025PF80119

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[0217] species”. Use of the verb “to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0218] 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.

[0219] 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.

[0220] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system. The invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. 2025PF80119

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[0222] 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

2025PF8011949CLAIMS:

1. A light generating system (1000) comprising a first light generating device (110), wherein the first light generating device (110) comprises a first solid state light source (10) and a luminescent converter (2000), wherein:the first solid state light source (10) is configured to generate first light source light (11) having a first peak emission wavelength (λp1) selected from the range of 420-490 nm;the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210), a second luminescent material (220) and a third luminescent material (230);the first luminescent material (210) consists of a luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein M comprises at least 50 mole% Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); wherein the first luminescent material light (211) has a first centroid wavelength (.ci) selected from the range of 610-650 nm; wherein the first luminescent material light (211) comprises an emission band having a first full width at half maximum FWHMi of< 50nm;the second luminescent material (220), different from the first luminescent material (210), is configured to convert part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221); wherein the second luminescent material light (221) has a second centroid wavelength (λc2) selected from the range of 600-660 nm;the third luminescent material (230) is configured to convert part of the first light source light (11) received by the third luminescent material (230) into third luminescent2025PF8011950material light (231); wherein the third luminescent material light (231) has a third centroid wavelength (λc₃) selected from the range of 500-580 nm;the first light generating device (110) is configured to generate first device light (111), wherein the first device light (111) comprises non-converted first light source light (11 ’), the first luminescent material light (211), the second luminescent material light (221) and the third luminescent material light (231); wherein the first device light (111) has a spectral power distribution, wherein (i) xo% of the spectral power in the wavelength range of 380-780 nm is provided by the non-converted first light source light (11 ’), (ii) xi% of the spectral power in the wavelength range of 380-780 nm is provided by the first luminescent material light (211), (iii) X2% of the spectral power in the wavelength range of 380-780 nm is provided by the second luminescent material light (221), and (iii) X3% of the spectral power in the wavelength range of 380-780 nm is provided by the third luminescent material light (231); wherein 40% > xo > 4% and 20% > xi > 4% and X2 + X3 > xi; andthe first device light (111) is white light having a correlated color temperature in a range from 2000K to 6500K and a color rendering index of at least 80.

2. The light generating system (1000) according to claim 1, wherein the first luminescent material (210) consists of (K1-y1Nay1)2(Six1Gez1Ti1-x1-z1)F6: Mn4+, wherein y1 ≥ 0.5 and 0.5 ≤ x1 ≤ 1 and 0 ≤ z1 ≤ 0.5.

3. The light generating system (1000) according to any one of the preceding claims, wherein the third luminescent material light (231) has a CIE u’-value, u’3 in the CIE u'v' color diagram, wherein the first device light (111) has a correlated color temperature, CCT1, wherein X2% of the spectral power in the wavelength range of 380-780 nm is provided by the second luminescent material light (221), wherein X3% of the spectral power in the wavelength range of 380-780 nm is provided by the third luminescent material light (231), and wherein one or more of the following applies:(i) 0.9-(0.95 - 2-U’3- 2.6-10'5-CCTl - 4.5-10-4-U’3-CCT1) < x2< 1.1 (0.95 - 2-u’3-2.6TO'5-CCT1 - 4.5-10-4-U’3-CCT1);(ii) 0.9-(-0.012 + 1.95-U’3+ 1.2-1O’5-CCT1 + 2.5-10-4-U’3-CCT1) <x3< l.l-(-0.012 + 1.95-U’3+ 1.2-1O’5-CCT1 + 2.5-10-4-U’3-CCT1);4. The light generating system (1000) according to any one of the preceding claims, wherein the first luminescent material (210) consists of Na₂SiF₆: Mn4+.2025PF80119515. The light generating system (1000) according to any one of the preceding claims, wherein the second luminescent material (220) comprises a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, a-SiA10N luminescent materials, and luminescent materials of the type Mi-xLi3-2y(Ali- bGab)i+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6.

6. The light generating system (1000) according to any one of the preceding claims, wherein the second luminescent material (220) comprises a luminescent material of the type M’xM2-2xAX6: Mn4+, wherein M comprises a monovalent cation selected from the group of NH4, Li, K, Rb and Cs., wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine.

7. The light generating system (1000) according to any one of the preceding claims, whereinthe luminescent converter (2000) comprises the first luminescent material (210) in a first concentration Ci; andthe luminescent converter (2000) comprises the second luminescent material (220) in a second concentration C2;wherein C1> 1.5*C2.

8. The light generating system (1000) according to any one of claims 1-7, wherein the first luminescent material (210) consists of Na₂(Si, Ti)F₆: Mn4+, and wherein the second luminescent material (220) comprises K₂(Si, Ti)F₆: Mn4+.

9. The light generating system (1000 according to any one of claims 1-7, wherein the first luminescent material (210) consists of Na₂(Si, Ti)F₆: Mn4+, and wherein the second luminescent material (220) comprises a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials and divalent europium comprising nitride luminescent materials.2025PF801195210. The light generating system (1000) according to any one of the preceding claims, wherein (x1+ x2) > x3, and wherein the first device light (111) is white light having a correlated color temperature in a range from 2000K to 3000K.

11. The light generating system (1000) according to any one of the preceding claims, wherein one of the following applies:(i) the luminescent converter (2000) comprises a first luminescent layer (2100) a second luminescent layer (2200) and a third luminescent layer (2300); wherein the first luminescent layer (2100) comprises the first luminescent material (210); wherein the second luminescent layer (2200) comprises the second luminescent material (220); and wherein the third luminescent layer (2300) comprises the third luminescent material (230);(ii) the luminescent converter (2000) comprises a first luminescent layer (2100) and a second luminescent layer (2200); wherein the first luminescent layer (2100) comprises the first luminescent material (210) and the second luminescent material (220); and wherein the second luminescent layer (2200) comprises the third luminescent material (230).

12. The light generating system (1000) according to claim 11, wherein the first luminescent layer (2100) is configured upstream of the second luminescent layer (2200).

13. The light generating system (1000) according to any one of the preceding claims, wherein the light generating system (1000) comprises a LED package (500) and a control system (300), wherein the LED package (500) comprises the first light generating device (110), a second light generating device (120), a third light generating device (130), and a fourth light generating device (140) wherein:the second light generating device (120) comprises a second solid state light source (20), wherein the second light generating device (120) is configured to generate second device light (121) having a second device centroid wavelength (λcd2) selected from the range of 600-660 nm;the third light generating device (130) comprises a third solid state light source (30), wherein the third light generating device (130) is configured to generate third device light (131) having a third device centroid wavelength (λcd3) selected from the range of 500-590 nm; wherein λcd2− λcd3≥ 25 nm;the fourth light generating device (140) comprises a fourth solid state light source (40), wherein the fourth light generating device (140) is configured to generate fourth2025PF8011953device light (141) having a fourth device centroid wavelength (λcd4) selected from the range of 430-490 nm; wherein λcd3− λcd4≥ 25 nm;in an operational mode of the light generating system (1000), the light generating system (1000) is configured to generate system light (1001) comprising one or more of the first device light (111), the second device light (121), the third device light (131) and the fourth device light (141); andthe control system (300) is configured to individually control the first light generating device (110), the second light generating device (120), the third light generating device (130), and the fourth light generating device (140); wherein the control system (300) is configured to control a spectral power distribution of the system light (1001) in the wavelength range of 380-780 nm by controlling the first light generating device (110), the second light generating device (120), the third light generating device (130), and the fourth light generating device (140).

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

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

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