A light generating system comprising a first light generating device and a control system

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110) and a control system (300), wherein the first light generating device (110) comprises a first solid state light source (10), a second solid state light source (20), and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 400-490 nm; (B) the second solid state light source (20) is configured to generate second light source light (21) having a second peak wavelength (λp2) selected from the range of 470-540 nm; wherein λp2 - λp1 ≥ 20 nm; (C) the luminescent converter (2000) is configured in a light receiving relationship with the first and second solid state light source (10,20); wherein the luminescent converter (2000) comprises a first luminescent material (210) and a second luminescent material (220); (D) the first luminescent material (210) comprises a luminescent material of the type M'xM2-2xAX6 doped with tetravalent manganese, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); (E) the second luminescent material (220) is configured to convert at least part of the second light source light (21) 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; wherein the second luminescent material light (221) comprises at least one emission band having a second full width at half maximum FWHM2 of ≥ 40 nm; (F) the first light generating device (110) is configured to generate first device light (111); wherein in an operational mode of the first light generating device (110), the first device light (111) comprises one or more of the first luminescent material light (211) and the second luminescent material light (221); wherein the first device light (111) has a first device centroid wavelength (λcd1) selected from the range of 600-660 nm; and (G) the control system (300) is configured to control a spectral power distribution of the first device light (111) by controlling the first solid state light source (10) and the second solid state light source (20).

Description

[0001] 2024PF80199

[0002] 1

[0003] A light generating system comprising a first light generating device and a control system

[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, US2024120448A1 describes a red-light emitting device comprising: a blue LED chip; and a photoluminescence material comprising a narrowband red fluoride phosphor and a broadband red phosphor. The narrowband red phosphor may comprise a manganese-activated fluoride phosphor of composition K2SiF6:Mn4+, K2GeF6:Mn4+, and K2TiF6:Mn4+.

[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, such as 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 in embodiments be more energy efficient than dc-LEDs, especially for the production of red light. Several types of phosphors may be available for use in a red pc-LED, with some phosphors providing red light with a high light quality, and some phosphors providing red light with a high energy efficiency. Generally, manufacturers may select which phosphors to use in a red pc-LED based on the application, wherein a combination of phosphors may provide a suitable quality light with a suitable energy efficiency. Yet, for some applications, both high quality red light and energy-efficient red light may be required (at different times). Hence, it is an aspect of the invention to provide an alternative light 2024PF80199

[0010] 2

[0011] generating system, which preferably further at least partly obviates one or more of abovedescribed 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.

[0012] According to a first aspect, the invention provides a light generating system comprising a first light generating device and a control system. The first light generating device may comprise a first solid state light source, a second 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 wavelength (λp1) selected from the range of 400-490 nm. Further, the second solid state light source may be configured to generate second light source light having a second peak wavelength (λp2) selected from the range of 470-540 nm. In embodiments, λp2 - λp1 ≥ 20 nm (may apply). The luminescent converter may be configured in a light receiving relationship with the first solid state light source and the second solid state light source. Further, the luminescent converter may comprise a first luminescent material and a second luminescent material. Especially, the first luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation (such as especially an alkaline cation), and x is in the range of 0-1, wherein A comprises a tetravalent cation, (comprising one or more of silicon, titanium, and germanium,) and wherein X comprises a monovalent anion, at least comprising fluorine. 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.

[0013] Especially, the first luminescent material light may have a first centroid wavelength (λc1) selected from the range of 610-650 nm. Further, the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHMi of < 40 nm. The second luminescent material may be configured to convert at least part of the second light source light received by the second luminescent material into second luminescent material light. Especially, the second luminescent material light may have a second centroid wavelength (λc2) selected from the range of 600-660 nm. Further, the second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2 of > 40 nm. The first light generating device may be configured to generate first device light. In embodiments, in an operational mode of the first light generating device, the first device light may comprise one or more of the first luminescent material light and the second luminescent material light. Further, (in an operational mode of the first light generating device,) the first device light may have a first 2024PF80199

[0014] 3

[0015] device centroid wavelength (λcd1) selected from the range of 600-660 nm. The control system may be configured to individually control the first solid state light source and the second solid state light source. Further, the control system may be configured to control a spectral power distribution of the first device light by controlling the first solid state light source and the second solid state light source. In embodiments, the control system may especially be configured to control a spectral power distribution of the first device light (in the wavelength range of 600-660 nm, such as) in the wavelength range of 600-700 nm, by controlling the first solid state light source and the second solid state light source. Hence, in specific embodiments, the invention provides a light generating system comprising a first light generating device and a control system, wherein the first light generating device comprises a first solid state light source, a second solid state light source, and a luminescent converter, wherein: (A) the first solid state light source is configured to generate first light source light having a first peak wavelength (λp1) selected from the range of 400-490 nm; (B) the second solid state light source is configured to generate second light source light having a second peak wavelength (λp2) selected from the range of 470-540 nm; wherein λp2 - λp1 ≥ 20 nm; (C) the luminescent converter is configured in a light receiving relationship with the first solid state light source and the second solid state light source; wherein the luminescent converter comprises a first luminescent material and a second luminescent material; (D) the first luminescent material comprises a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, 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 FWHMi of < 40 nm; (E) the second luminescent material is configured to convert at least part of the second 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; wherein the second luminescent material light comprises at least one emission band having a second full width at half maximum FWHM2 of > 40 nm; (F) the first light generating device is configured to generate first device light; wherein in an operational mode of the first light generating device, the first device light comprises one or 2024PF80199

[0016] 4

[0017] more of the first luminescent material light and the second luminescent material light; wherein the first device light has a first device centroid wavelength (λcd1) selected from the range of 600-660 nm; and (G) the control system is configured to individually control the first solid state light source and the second solid state light source; wherein the control system is configured to control a spectral power distribution of the first device light by controlling the first solid state light source and the second solid state light source.

[0018] Such a light generating system may provide (orange or) red first device light. Especially, such a light generating system may provide one or more of (i) (orange or red) first device light with a high energy efficiency, and (ii) (orange or red) first device light having a high (color and / or light) quality. The light generating system, such as especially the first light generating device, may be configured to switch between providing high quality first device light and high energy-efficient first device light by controlling (with the control system) the first solid state light source and the second solid state light source.

[0019] In embodiments, the light generating system, such as especially the first light generating device, may comprise a 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 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. Further, the first peak wavelength (λp1) may be selected from the range of 420-490 nm, such as from the range of 430-490 nm, especially from the range of 440-465 nm, like from the range of 440-460 nm. Hence, in specific embodiments, the first peak wavelength (λp1) may be selected from the range of 440-465 nm. The first luminescent material may have a relatively high absorption in the wavelength range of 440-465 nm, such that first light source light having a first peak wavelength (λp1) selected from the range of 440-465 nm may be especially suited to excite the first luminescent material.

[0020] Hence, the first light source light may especially be blue light. 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 2024PF80199

[0021] 5

[0022] largest (emission intensity) value is found in a graph of the spectral power distribution. The peak emission wavelength may especially be determined at room temperature.

[0023] Further, the light generating system, such as especially the first light generating device, may comprise a second solid state light source. The second solid state light source may be selected from the group comprising a light emitting diode (LED), a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). The second solid state light source may be configured to generate second light source light. The second light source light may have a second peak wavelength (λp2) selected from the range of 460-550 nm, such as from the range of 470-540 nm, especially from the range of 480-540 nm. Further, the second peak wavelength (λp2) may be selected from the range of 490-540 nm, such as from the range of 500-540 nm, especially from the range of 500-525 nm. In embodiments, λp2 - λp1 ≥ 10 nm (may apply), such as λp2 - λp1 ≥ 20 nm, especially λp2 - λp1 ≥ 30 nm. Additionally or alternatively, λp2 - λp1 ≤ 120 nm (may apply), such as λp2 - λp1 ≤ 100 nm, especially λp2 - λp1 ≤ 80 nm. Hence, in specific embodiments, the second peak wavelength (λp2) may be selected from the range of 500-540 nm. The second luminescent material may have a relatively higher absorption in the wavelength range of 500-540 nm than the first luminescent material. Hence, second light source light having a second peak wavelength (λp2) selected from the range of 500-540 nm may facilitate more selectively exciting the second luminescent material. The second light source light may be blue light or green light, such as especially green light. The term “green light”, and similar terms, may especially relate to light having a wavelength in the range of about 490-560 nm.

[0024] The (light generating system, such as especially the) first light generating device may further comprise a luminescent converter. The luminescent converter may be configured in a light receiving relationship with the first solid state light source. Further, the luminescent converter may be configured in a light receiving relationship with the second solid state light source. Especially, the luminescent converter may be configured downstream from the first solid state light source and the second 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 2024PF80199

[0025] 6

[0026] contact with and covering (a light escape surface of) the first solid state light source. Further, the luminescent converter may be configured in physical contact with and covering (a light escape surface of) the second solid state light source. That is, the luminescent converter may be configured as a coating (on the first and / or second 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 and / or the second solid state light source, or (ii) at a non-zero distance d1 from (the light escape surface of) the first solid state light source and / or the second solid state light source. The non-zero distance d1 may be selected from the range of ≥ 5 μm, such as from the range of ≥ 10 μm, especially from the range of ≥ 25 μm. Additionally or alternatively, the non-zero distance d1 may be selected from the range of ≤ 10 cm, such as from the range of ≤ 5 cm, especially from the range of ≤ 1 cm. Hence, in specific embodiments, the luminescent converter may be physically separated from the first solid state light source and / or from the second solid state light source.

[0027] 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 and / or the second light source light may be incident on the first major converter face of the luminescent converter, and the first luminescent material light and / or 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 may be configured in a transmissive mode. Herein, the term “transmissive mode” may indicate that when at least part of the (first and / or second) 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 and / or on the second solid state light source. Further, configuring the luminescent converter in the transmissive mode may simplify the construction of the first light generating device, as no optical elements such as reflectors and / or (dichroic) beam splitters are required to guide the luminescent material light to a light exit of the first light generating device.

[0028] Yet, in alternative embodiments, the luminescent converter may be configured in a reflective mode. Herein, the term “reflective mode” may indicate that when (first and / or 2024PF80199

[0029] 7

[0030] second) light source light is reflected at the luminescent converter, it may have a direction overlapping with the direction in which the luminescent material light escapes from the first light generating device. Hence, in the reflective mode, the first (and / or second) light source light may be incident on the first major converter face, and the first (and / or second) luminescent material light may exit the luminescent converter via the first major converter face. Configuring the luminescent converter in the reflective mode may improve thermal management, as the absorption and conversion of light may be spread over a larger optical path length within the luminescent converter. A larger optical path length may further facilitate reducing one or more of the concentration of luminescent materials in and the thickness of the luminescent converter. In the reflective mode, the second major converter face may comprise a reflective coating. Alternatively, in the reflective mode, the luminescent converter may be configured in physical contact with a reflective mirror at the second major converter face.

[0031] The luminescent converter may comprise one or more luminescent materials, such as at least a first luminescent material and a second luminescent material. 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 “violet light”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. The first radiation and second radiation may have different spectral power distributions, with the second radiation generally having a spectral power distribution at larger wavelengths than the first radiation (i.e. “down-conversion”). In embodiments, the “luminescent material” may especially refer to a material that can convert radiation into e.g. visible and / or infrared light. The terms “visible light” or “visible emission”, and similar terms, refer to light having one or more wavelengths in the range of about 380-780 nm. Further, IR (infrared) may especially refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength of ≤ 1500 nm, like a wavelength of ≥ 900 nm, though other wavelengths may be possible.

[0032] 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 2024PF80199

[0033] 8

[0034] refer to phosphorescence. In embodiments, the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “luminescent material light” or “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. Likewise, the term “luminescent material” may in embodiments refer to phosphorescence and / or fluorescence. The term “luminescent material” may also refer to a plurality of different luminescent materials. Examples of possible luminescent materials are indicated below. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. Instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art.

[0035] 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.

[0036] 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 2024PF80199

[0037] 9

[0038] about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Y1-xLux)3B5O12:Ce, wherein 0 ≤ x ≤ 1. The term “: Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. This is known to the person skilled in the art. Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, especially 0.1 to 2% (relative to A). Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art. In embodiments, such luminescent materials may have a suitable spectral distribution, have a relatively high efficiency, and have a relatively high thermal stability.

[0039] 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.

[0040] 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)2SisN8: Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations, as is known to the person skilled in the art. In general, Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces. The term “: Eu”, indicates that part of the metal ions (indicated by M) is replaced by Eu (in these examples by Eu2+). For instance, assuming 2% Eu in CaAlSiN3:Eu, the correct formula could be (Ca0.98Eu0.02)AlSiN3.

[0041] 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. 2024PF80199

[0042] 10

[0043] In embodiments, the luminescent material may comprise a luminescent material of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux. Herein, M may comprise one or more of magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba), such as especially one or more of Ca, Sr, and Ba. Hence, M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Euxmay especially refer to (Mg, Ca, Sr, Ba)i-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux. Such a luminescent material may be indicated as an SLA-type phosphor, or SLA phosphor. Luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux may be described in US2021171827A1, which is herein incorporated by reference. In Mi-xLi3-2yAli+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 Mi-xLi3-2yAli+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.

[0044] 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).

[0045] In embodiments, the luminescent material may comprise a tetravalent manganese-comprising luminescent material, i.e., a luminescent material doped with tetravalent manganese. Especially, in embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x may be selected from the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Such luminescent materials may herein also be indicated as “KSiF” or “KSF”, regardless of the composition of M’, M, A, and X. A luminescent material of the type 2024PF80199

[0046] 11

[0047] M’XM2-2XAX6 doped with tetravalent manganese is amongst others described in WO2013121355A1, which is herein incorporated by reference. Passages from WO2013121355A1 are also copied herein. In embodiments, the alkaline earth cation M’ may comprise one or more of magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba. Further, the alkaline cations M may comprise one or more of sodium (Na), potassium (K) and rubidium (Rb). Optionally, M may (further) comprise one or more of ammonium (NHZ), lithium (Li), and cesium (Cs). In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. The phrase “wherein M comprises at least potassium” indicates for instance that of all M cations in a mole M’xM2-2xAX6, a fraction comprises K+and an optionally remaining fraction comprises one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’xM2-2xAX6 luminescent material has the hexagonal phase. In yet another embodiment, the M’xM2-2xAX6 luminescent material has the cubic phase. In an embodiment, a combination of different alkaline cations M may be applied. In yet another embodiment, a combination of different alkaline earth cations M’ may be applied. In yet another embodiment, a combination of one or more alkaline cations M and one or more alkaline earth cations M’ may be applied. For instance, KRbo.sSro^sAXe might be applied. As indicated above, x in the formula M’xM2-2xAX6 may be selected from the range of 0-1, especially x < 1. In specific embodiments, x = 0.

[0048] The term “tetravalent manganese” refers to Mn4+. This is a well-known luminescent ion. In the formula as indicated above, part of the tetravalent cation A (such as Si) is being replaced by manganese. Hence, M’xM2-2xAX6 doped with tetravalent manganese may also be indicated as M’xM2-2xAi-mMnmX6 (or M’xM2-2xAX6: Eu). 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+).

[0049] In embodiments, A may comprise a tetravalent cation, and preferably at least comprises silicon. A may optionally (further) comprise one or more of titanium (Ti), germanium (Ge), stannum (Sn) and zinc (Zn). Preferably, at least 80%, even more preferably at least 90%, such as at least 95% of A consists of silicon. In a specific embodiment, M’XM2-2xAXe can also be described as (Ki-r-i-n-c-nhRbrLiiNanCsc(NH4)nh)2AX6, wherein r is in the 2024PF80199

[0050] 12

[0051] 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’XM2-2XAXe 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=l. In embodiments, k=l, and the others (mg, ca, sr, ba, r, 1, n, c, nh) are zero.

[0052] 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.

[0053] In an embodiment, M’xM2-2XAX6 comprises BGSiFe (indicated herein also as KSiF system). In another preferred embodiment, M’xM2-2XAX6 comprises KRbSiFe (herein also indicated as K, Rb system). In specific embodiments, the indication M’xM2-2XAX6 may refer to one or more of (K, Rb)2SiFe: Mn4+, (K, Rb)2TiFe: Mn4+, K2(Si, Ti)Fe: Mn4+, and Rb2(Si, Ti)Fe: Mn4+, such as one or more of K2TiFe: Mn4+, of K2SiFe: Mn4+, and of Rb2SiFe: Mn4+. As can be derived from the above, “(Si, Ti)” may indicate one or more of Si and Ti. Hence, in specific embodiments, the luminescent material may comprise one or more of (K, Rb)2SiFe: Mn4+and K2(Si, Ti)Fe: Mn4+. The luminescent material may also be coated, as also described in WO2013121355A1.

[0054] 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 2024PF80199

[0055] 13

[0056] x+y+z=l. Referring to e.g. M’xM2-2xAX6, this may refer to e.g. one or more of K2SiFe: Mn4+and of Rb2SiF6: Mn4+, or (KxRby)2SiFe: Mn4+, etc. Referring to (Ba, Sr, Ca)AlSiN3: Eu, this may imply BaAlSi Eu, SrAlSi Eu, CaAlSi Eu, (BaxSry)AlSiN3: Eu, (BaxCay)AlSiN3: Eu, (CaxSry)AlSiN3: Eu, or (BaxSryCaz)AlSiN3: Eu. Referring to e.g. A3B5O12:Ce, wherein A in embodiments comprises one or more of Y, La, Gd, Tb and Lu, this may imply YsBsO Ce, La3BsOi2: Ce, GdBsOniCe, TbsBsOniCe, LusBsOniCe, but also e.g. (Yx, Gdy)3BsOi2: Ce, (Yx, Luy)3BsOi2: Ce, (Gdx, Luy)3BsOi2: 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)2SiFe: Mn4+, may e.g. refer to K2SiFe: Mn4+and of Rb2SiFe: Mn4+, or (KxRby)2SiFe: Mn4+. Also herein in general x+y=l. Hence, when M (or A) may refer to n different elements, with n being at least two, 2n-l permutations may in principle be possible.

[0057] In embodiments, the luminescent converter may comprise a first luminescent material. The first luminescent material may comprise any (combination) of the luminescent materials indicated above. The first luminescent material may comprise a quantum structure, such as a quantum dot, or such as a quantum rod. Quantum structures may for instance comprise (such as be based on) one or more of cadmium (Cd), indium (In), zinc (Zn), silver (Ag), and lead (Pb). Further, and especially, the first luminescent material may comprise a luminescent material of the type M’xM2-2XAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, wherein x is in the range of 0-1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine. The first luminescent material may thus comprise a luminescent material of the type M’xM2-2XA(F, Cl, Br, I)6 doped with tetravalent manganese, wherein x may especially be in the range of 0-1. As can be derived from the above, the indication “(F, Cl, Br, I)” may refer to one or more of F, Cl, Br, and I, but may especially refer to at least F, and optionally one or more of Cl, Br, and I (see also above, wherein it is indicated that cl+b+i < 1).

[0058] In embodiments, the first luminescent material may comprise a luminescent material of the type M’xM2-2XAX6 doped with tetravalent manganese, wherein M may comprise an alkaline cation, and wherein A may (at least) comprise one or more of silicon (Si), titanium (Ti), and germanium (Ge). In embodiments, A may (at least) comprise Si. Additionally or alternatively, A may (at least) comprise Ti. Additionally or alternatively, A may (at least) comprise Ge. Hence, in specific embodiments, the first luminescent material 2024PF80199

[0059] 14

[0060] may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M may comprise an alkaline cation, and A may comprise one or more of silicon, titanium, and germanium. A luminescent material of the type M’xM2-2xAX6: Mn4+comprising one or more of Si, Ti, and Ge, may be relatively efficient in converting (especially first) light source light into first luminescent material light.

[0061] Hence, A may comprise one or more of Si, Ti, and Ge. Especially, A may comprise silicon. Further, in specific embodiments, A may consist of Si. Further, as indicated above, M may comprise one or more of Na, K, and Rb. Especially, M may comprise one or more of K and Rb. In specific embodiments, M may consist of K. Alternatively, M may consist of Rb. Further, M may comprise a mixture of K and Rb. Hence, in specific embodiments, the first luminescent material may comprise (K, Rb)2SiFe: Mn4+. Such a luminescent material may have a relatively high absorption at the first peak wavelength (kpi ), and a relatively low absorption at the second peak wavelength (Xp2), thereby allowing selective excitation of the first luminescent material with the first light source light.

[0062] As indicated above, the first luminescent material may comprise a combination of luminescent materials. Hence, in embodiments, the first luminescent material may comprise a luminescent material of the type M’xM2-2xAX6: Mn4+and a quantum structure (such as especially a quantum dot). Alternatively, the first luminescent material may (essentially) consist of one or more luminescent materials of the type M’xM2-2xAX6: Mn4+, wherein the one or more luminescent materials of the type M’xM2-2xAX6: Mn4+may differ in the composition of M and / or the composition of A. In embodiments, the first luminescent material may consist for at least 70%, such as at least 80%, especially at least 90%, like at least 95%, including (essentially) 100%, of luminescent materials of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation (such as especially an alkaline cation), and x is in the range of 0-1, wherein A comprises a tetravalent cation, (comprising one or more of silicon, titanium, and germanium,) and wherein X comprises a monovalent anion, at least comprising fluorine. Hence, in specific embodiments, the first luminescent material may consist for at least 80% of luminescent materials of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine. Such a composition of the first luminescent material may facilitate that the first luminescent material may be excited relatively more by 2024PF80199

[0063] 15

[0064] the first light source light than by the second light source light, allowing for selective excitation of the first luminescent material by the first light source light.

[0065] In embodiments, the first luminescent material may be configured to convert at least part of the first light source light received by the first luminescent material into first luminescent material light. The first luminescent material light may have a first centroid wavelength ( ci). The term “centroid wavelength”, also indicated as c, 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 Ze = X I(k) / (S I( X)), where the summation is over the wavelength range of interest, and 1(A) 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 ( ci) may be selected from the range of 600-660 nm, like from the range of 610-650 nm, such as from the range of 620-640 nm, especially from the range of 625-635 nm. Hence, in embodiments, the first luminescent material light may comprise, such as be, one or more of orange light and red light, such as especially red light. The terms “orange light” or “orange emission”, and similar terms, may especially relate to light having a wavelength in the range of about 590-620 nm. The terms “red light” or “red emission”, and similar terms, may especially relate to light having a wavelength in the range of about 620-780 nm.

[0066] Further, the first luminescent material light may comprise at least one emission band having a first full width at half maximum FWHMi of < 65 nm, such as < 55 nm, especially < 40 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. Additionally or alternatively, the first luminescent material light may comprise the at least one emission band having a first full width at half maximum FWHMi of > 2 nm, such as > 5 nm, especially > 7 nm. In embodiments, the first luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the first full width at half maximum FWHMi. Additionally or alternatively, the first luminescent material light may comprise a plurality of emission bands, wherein essentially all of the emission bands may have the first full width at half maximum FWHMi. The term “emission band” may refer to the emission (spectral power distribution) resulting from a radiative transition of electrons from (vibrational levels of) a first higher-energy excited state to (vibrational levels of) a second lower-energy (ground) state, wherein a larger number of 2024PF80199

[0067] 16

[0068] 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.

[0069] The luminescent converter may comprise more of the first luminescent material than needed to transmit at most 2% of (a spectral power of) the first light source light received by the luminescent converter. Especially, the luminescent converter may comprise at least 1.1 times an amount, such as at least 1.2 times an amount, especially at least 1.5 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Additionally or alternatively, the luminescent converter may comprise at most 5 times an amount, such as at most 4 times an amount, especially at most 3 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Hence, in specific embodiments, the luminescent converter may comprise at least 1.2 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Such an amount of first luminescent material in the luminescent converter may especially facilitate that even upon partial degradation of the first luminescent material (essentially) no first light source light may be transmitted through the luminescent converter. As a half-life of the first solid state light source may be longer than a half-life of the first luminescent material, such a luminescent converter may improve the durability and lifespan of the first light generating device.

[0070] As indicated above, the luminescent converter may comprise more of the first luminescent material than needed to transmit at most 2% of the first light source light received by the luminescent converter. Hence, in embodiments, the first luminescent material may be configured to convert > 95%, such as > 98%, especially > 99%, including (essentially) 100%, of the first light source light received by the first luminescent material into first luminescent material light. Additionally or alternatively, the first luminescent material may be configured to convert < 99.5%, such as < 99%, especially < 98%, of the first light source light received by the first luminescent material into first luminescent material light. Further, in embodiments, the first luminescent material may be configured to (absorb and / or) convert < 20%, such as < 15%, especially < 10%, like < 5%, such as < 2%, of the second light source light received by the first luminescent material into first luminescent material light. Additionally or alternatively, the first luminescent material may be configured 2024PF80199

[0071] 17

[0072] to (absorb and / or) convert > 1%, such as > 2%, especially > 3%, of the second light source light received by the first luminescent material into first luminescent material light. Hence, the first luminescent material may be configured to convert more first light source light than second light source light (into first luminescent material light). Such a first luminescent material may thus especially allow (selective) conversion of first light source light, and (selective) transmission of second light source light.

[0073] In embodiments, the luminescent converter may further comprise a second luminescent material. The second luminescent material may be any (combination) of the luminescent materials indicated above. The second luminescent material may comprise quantum structures, such as quantum dots or quantum rods. Hence, in embodiments, the second luminescent material may comprise a luminescent material selected from the group of quantum dot luminescent materials. (Additionally or) alternatively, the second luminescent material may comprise a phosphor. Especially, the second luminescent material may 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 of the type MAlSiNs Eu2, wherein M may comprise one or more of Ba, Sr, and Ca (see also above). Further, in embodiments, the second luminescent material may comprise a luminescent material of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba (such as especially 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 (see also above). Additionally or alternatively, the second luminescent material may comprise a luminescent material selected from the group of SiAlON(-type) phosphors, such as selected from the group comprising (a) S112— m— n Alm+nOnN16-n: Eu2+, (b) Sie nAlnOnNsn: Eu2+, wherein 0 < n < 4.2, and (c) Si2-nAlnOi+nN2-n: Eu2+, wherein 0 < n < 0.2. 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, SiAlON phosphors, and luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba. A second luminescent material comprising a luminescent material selected from such a group may provide the benefit that the second luminescent material may be configured to covert (at least part of) the second light source light received by the second luminescent material. 2024PF80199

[0074] 18

[0075] The second luminescent material may especially be different from the first luminescent material. Hence, the second luminescent material may comprise a different type of luminescent material than the first luminescent material. Alternatively, the first and second luminescent material may each comprise the same type(s) of luminescent material(s), wherein a composition of the (type(s) of) luminescent material(s) may differ between the first and second luminescent material.

[0076] The second luminescent material may be configured to convert at least part of the second light source light received by the second luminescent material into second luminescent material light. Especially, the second luminescent material may be configured to convert > 50%, such as > 60%, especially > 70%, like > 80%, of (a spectral power of) the second light source light received by the second luminescent material into second luminescent material light. Further, the second luminescent material may be configured to convert > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of (a spectral power of) the second light source light received by the second luminescent material into second luminescent material light. Additionally or alternatively, the second luminescent material may be configured to convert < 99%, such as < 98%, especially < 95%, of (a spectral power of) the second light source light received by the second luminescent material into second luminescent material light.

[0077] Further, the second luminescent material may be configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light. Especially, the second luminescent material may be configured to convert > 50%, such as > 60%, especially > 70%, of (a spectral power of) the first light source light received by the second luminescent material into second luminescent material light. Further, the second luminescent material may be configured to convert > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of (a spectral power of) the first light source light received by the second luminescent material into second luminescent material light. Additionally or alternatively, the second luminescent material may be configured to convert < 99%, such as < 98%, especially < 95%, of (a spectral power of) the first light source light received by the second luminescent material into second luminescent material light.

[0078] The second luminescent material light may have a second centroid wavelength ( c?). The second centroid wavelength ( c?) may be selected from the range of 590-680 nm, such as from the range of 600-660 nm, especially from the range of 600-650 nm. Hence, the second luminescent material light may comprise, such as be, one or more of orange light and 2024PF80199

[0079] 19

[0080] red light, such as especially red light. The second centroid wavelength ( c?) may be (roughly) equal to the first centroid wavelength ( ci), such as differ by < 5 nm, especially by < 2 nm, including by (essentially) 0 nm. Alternatively, the second centroid wavelength (Xc?) may differ from the first centroid wavelength ( ci). In embodiments, |Xc2- ci| > 5 nm (may apply), such as |Xc2- ci| > 10 nm, especially |Xc2- ci| > 20 nm. Additionally or alternatively, in embodiments, |Xc2- ci| < 50 nm, such as |Xc2- ci| < 40 nm, especially |Xc2- ci| < 30 nm.

[0081] 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 nm, especially > 60 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. Hence, the second luminescent material light may be broadband emission. Alternatively, the second luminescent material light may be narrowband emission. That is, the second luminescent material light may comprise the at least one emission band having a second full width at half maximum FWHM2 of < 50 nm, such as < 40 nm, especially < 30 nm. Additionally or alternatively, the second luminescent material light may comprise at least one emission band having a second full width at half maximum FWHM2 of > 5 nm, such as > 10 nm, especially > 15 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.

[0082] The luminescent converter may comprise more of the second luminescent material than needed to transmit at most 2% of (a spectral power of) the first light source light received by the luminescent converter. Especially, the luminescent converter may comprise at least 1.1 times an amount, such as at least 1.2 times an amount, especially at least 1.5 times an amount of the second luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Additionally or alternatively, the luminescent converter may comprise at most 5 times an amount, such as at most 4 times an amount, especially at most 3 times an amount of the second luminescent material needed to transmit at most 2% of the first light source light received by the luminescent converter. Further, the luminescent converter may comprise more of the second luminescent material than needed to transmit at most 2% of (a spectral power of) the second light source light received by the luminescent converter. Especially, the luminescent converter may comprise at least 1.1 times an amount, such as at least 1.2 times an amount, especially at least 1.5 times 2024PF80199

[0083] 20

[0084] an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the luminescent converter. Additionally or alternatively, the luminescent converter may comprise at most 5 times an amount, such as at most 4 times an amount, especially at most 3 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the luminescent converter. Hence, in specific embodiments, the luminescent converter may comprise at least 1.2 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the luminescent converter. Such an amount of second luminescent material in the luminescent converter may facilitate that (essentially) no second light source light may be transmitted through the luminescent converter. Hence, such an luminescent converter may facilitate that the first device light may (essentially) consist of (the second) luminescent material light, in embodiments wherein the second solid state light source is switched on, and the first solid state light source is switched off.

[0085] Yet, in embodiments, it may be desirable to allow some second light source light to be transmitted through the luminescent converter. In such embodiments, the luminescent converter may comprise less of the second luminescent material than needed to transmit at most 2% of (a spectral power of) the second light source light received by the luminescent converter. Especially, the luminescent converter may comprise at most 1 times an amount, such as at most 0.8 times an amount, especially at most 0.6 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the luminescent converter. Additionally or alternatively, the luminescent converter may comprise at least 0.1 times an amount, such as at least 0.2 times an amount, especially at least 0.4 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the luminescent converter. Further, the luminescent converter may comprise between 0.1 and 1 times an amount, such as between 0.2 and 0.8 times an amount, especially between 0.4 and 0.6 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the luminescent converter. Hence, in specific embodiments, the luminescent converter may comprise between 0.2 and 0.8 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the luminescent converter. Such an amount of second luminescent material may facilitate that the luminescent converter may transmit some of the second light source light. Hence, with such an amount of second luminescent material, first device light comprising at least part of the second light source light may be provided. 2024PF80199

[0086] 21

[0087] In embodiments, the luminescent converter may comprise one or more further luminescent converter luminescent materials, such as selected from the luminescent materials provided above. Yet, relative to a total weight of the first luminescent material, the second luminescent material, and the one or more further luminescent converter luminescent materials, the first luminescent material and second luminescent material may be present (in the luminescent converter) with a (combined) weight percentage of > 70%, such as > 80%, especially > 90%, including (essentially) 100%. That is, a luminescent material content of the luminescent converter may consist for at least 70 wt.%, such as at least 80 wt.%, especially at least 90 wt.%, including (essentially) 100 wt.%, of the first luminescent material and the second luminescent material. Alternatively, a luminescent material content of the luminescent converter may consist for at most 98 wt.%, such as at most 95 wt.%, especially at most 90 wt.%, of the first luminescent material and the second luminescent material.

[0088] In embodiments, the first luminescent material and the second luminescent material may be configured evenly distributed within the luminescent converter.

[0089] Alternatively, one or more of the first luminescent material and the second luminescent material may be configured in a (concentration) gradient within the luminescent converter (wherein the gradient may especially be along an optical path of the first light source light and / or the second light source light through the luminescent converter). Further, the first luminescent material and / or the second luminescent material may be restricted to a specific region within the luminescent converter. Especially, in embodiments, the luminescent converter may comprise a first luminescent layer and a second luminescent layer. The first luminescent layer may especially comprise the first luminescent material (and may be (essentially) free from the second luminescent material). Additionally or alternatively, the second luminescent layer may especially comprise the second luminescent material (and may be (essentially) free from the first luminescent material). The second luminescent layer may be configured downstream of (and in a light receiving relationship with) the first solid state light source and the second solid state light source. Similarly, the first luminescent layer may be configured downstream of (and in a light receiving relationship with) the first solid state light source and the second solid state light source. In embodiments, one of the first luminescent layer and the second luminescent layer may be configured downstream from the other (one) of the first luminescent layer and the second luminescent layer. In embodiments, the first luminescent layer may be configured in physical contact with the second luminescent layer. Alternatively, the first luminescent layer may be configured at a second distance d₂ from the second luminescent layer. That is, in embodiments, the first luminescent layer may 2024PF80199

[0090] 22

[0091] be physically separated from the second luminescent layer. In embodiments, the second distance d? may be selected from the range of > 5 pm, such as from the range of ≥ 10 μm, especially from the range of ≥ 25 μm. Additionally or alternatively, the second distance d? may be selected from the range of < 5 cm, such as from the range of < 2.5 cm, especially from the range of < 1 cm. Hence, in specific embodiments, the luminescent converter may comprise a first luminescent layer and a second luminescent layer; wherein the first luminescent layer and the second luminescent layer may be configured downstream of the first solid state light source and the second solid state light source; and wherein one of the first luminescent layer and the second luminescent layer may be configured downstream from the other of the first luminescent layer and the second luminescent layer; wherein the first luminescent layer may comprise the first luminescent material; and wherein the second luminescent layer may comprise the second luminescent material. A luminescent converter comprising a first luminescent layer and a second luminescent layer may facilitate selectively exciting one or more of the first luminescent material and the second luminescent material, depending on the relative orientations of the layers (see also below).

[0092] In embodiments, the second luminescent layer may be configured upstream of the first luminescent layer. Hence, first light source light (emitted by the first solid state light source) and second light source light (emitted by the second solid state light source) may be incident on the second luminescent layer, before (optionally) being incident on the first luminescent layer. As indicated above, the second luminescent material may be configured to convert at least part of the first light source light received by the second luminescent material into second luminescent material light. In embodiments wherein the second luminescent layer is configured upstream of the first luminescent layer, the second luminescent material may especially be configured to convert < 90%, such as < 80%, especially < 70%, like < 60% of the first light source light received by the second luminescent material into second luminescent material light. Hence, in embodiments wherein the second luminescent layer is configured upstream of the first luminescent layer, the second luminescent layer may be configured to transmit at least part of the first light source light received by the second luminescent layer. Especially, in such embodiments, the second luminescent layer may be configured to transmit at least 10%, such as at least 20%, especially at least 30%, like at least 40%, of the first light source light received by the second luminescent layer. Additionally or alternatively, the second luminescent layer may be configured to transmit at most 80%, such as at most 70%, especially at most 60%, like at most 50%, of the first light source light received by the second luminescent layer. Hence, in specific embodiments, the second 2024PF80199

[0093] 23

[0094] luminescent layer may be configured upstream of the first luminescent layer; wherein 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; and wherein the second luminescent layer may be configured to transmit at least 20% of the first light source light received by the second luminescent layer. Such a configuration may provide the benefit that at least part of the first light source light may be incident on the first luminescent layer. Further, the first luminescent material may be more susceptible to photodegradation upon irradiation with high-intensity (blue) light. Hence, by configuring the second luminescent layer upstream of the first luminescent layer, the lifetime of the first luminescent material may be increased.

[0095] Hence, the second luminescent layer may be configured upstream of the first luminescent layer. Yet, especially, the first luminescent layer may be configured upstream of the second luminescent layer. In such embodiments, the first luminescent layer may be configured to transmit at least part of the second light source light received by the first luminescent layer (to the second luminescent layer). Especially, in embodiments, the first luminescent layer may be configured to transmit at least 60%, such as at least 70%, especially at least 80%, of the second light source light received by the first luminescent layer. Further, the first luminescent layer may be configured to transmit at least 85%, such as at least 90%, especially at least 95%, like at least 98%, including (essentially) 100%, of the second light source light received by the first luminescent layer. Additionally or alternatively, the first luminescent layer may be configured to transmit at most 99%, such as at most 98%, especially at most 95%, of the second light source light received by the first luminescent layer. Hence, in specific embodiments, the first luminescent layer may be configured upstream of the second luminescent layer; wherein the first luminescent layer may be configured to transmit at least 70% of the second light source light received by the first luminescent layer. As both the first luminescent material and the second luminescent material are configured to convert the first light source light, and (essentially only) the second luminescent material is configured to convert the second light source light, such a configuration may provide the benefit that the first light source light may be (mostly) converted by the first luminescent material in the first luminescent layer, and the second light source light may be transmitted by the first luminescent layer to be converted by the second luminescent material in the second luminescent layer. Hence, such a configuration may facilitate selectively exciting the first luminescent material and the second luminescent material. 2024PF80199

[0096] 24

[0097] As indicated above, the luminescent converter may comprise more of the first luminescent material than needed to transmit at most 2% of the first light source light received by the luminescent converter. Hence, similarly, the first luminescent layer may comprise at least 1.1 times an amount, such as at least 1.2 times an amount, especially at least 1.5 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the first luminescent layer. Additionally or alternatively, the first luminescent layer may comprise at most 5 times an amount, such as at most 4 times an amount, especially at most 3 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the first luminescent layer. Hence, in specific embodiments, the first luminescent layer may comprise at least 1.2 times an amount of the first luminescent material needed to transmit at most 2% of the first light source light received by the first luminescent layer. Such an amount of first luminescent material in the first luminescent layer may especially facilitate that (essentially) all of the first light source light may be converted into first luminescent material light, and that (essentially) no first light source light may be transmitted to (be incident on) the second luminescent layer. Hence, in embodiments wherein only the first solid state light source (of the first light generating device) is switched on, the first device light may (essentially) consist of the first luminescent material light.

[0098] In embodiments, the first luminescent layer may comprise one or more further first luminescent layer luminescent materials, such as selected from the luminescent materials provided above. In such embodiments, relative to a total weight of the first luminescent material and the one or more further first luminescent layer luminescent materials, the first luminescent material may be present (in the first luminescent layer) with a weight percentage of < 98%, such as < 95%, especially < 90%. That is, a luminescent material content of the first luminescent layer may consist for at most 98 wt.%, such as at most 95 wt.%, especially at most 90 wt.%, of the first luminescent material. Alternatively, a luminescent material content of the first luminescent layer may consist for at least 70 wt.%, such as at least 80 wt.%, especially at least 90 wt.%, including (essentially) 100 wt.%, of the first luminescent material. Hence, in specific embodiments, a luminescent material content of the first luminescent layer may consist for at least 80 wt.% of the first luminescent material. Such a luminescent material content may facilitate that the light generated by the first luminescent layer (upon irradiation with first light source light) may largely consist of first luminescent material light. 2024PF80199

[0099] 25

[0100] As indicated above, the luminescent converter may comprise more of the second luminescent material than needed to transmit at most 2% of the first light source light received by the luminescent converter. Hence, similarly, (the first luminescent layer may be configured upstream of the second luminescent layer, wherein) the second luminescent layer may comprise at least 1.1 times an amount, such as at least 1.2 times an amount, especially at least 1.5 times an amount of the second luminescent material needed to transmit at most 2% of the first light source light received by the second luminescent layer. Additionally or alternatively, (the first luminescent layer may be configured upstream of the second luminescent layer, wherein) the second luminescent layer may comprise at most 5 times an amount, such as at most 4 times an amount, especially at most 3 times an amount of the second luminescent material needed to transmit at most 2% of the first light source light received by the second luminescent layer. Hence, in specific embodiments, the second luminescent layer may comprise at least 1.2 times an amount of the second luminescent material needed to transmit at most 2% of the first light source light received by the second luminescent layer. Such an amount of second luminescent material in the second luminescent layer may especially facilitate that (essentially) all of the first light source light (transmitted by the first luminescent layer) may be converted into second luminescent material light. Hence, such an amount of second luminescent material may facilitate providing first device light (essentially) free from first light source light.

[0101] Further, in embodiments, (the first luminescent layer may be configured upstream of the second luminescent layer, wherein) the second luminescent layer may comprise at least 1.1 times an amount, such as at least 1.2 times an amount, especially at least 1.5 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the second luminescent layer. Additionally or alternatively, (the first luminescent layer may be configured upstream of the second luminescent layer, wherein) the second luminescent layer may comprise at most 5 times an amount, such as at most 4 times an amount, especially at most 3 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the second luminescent layer. Hence, in specific embodiments, the second luminescent layer may comprise at least 1.2 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the second luminescent layer. Such an amount of second luminescent material in the second luminescent layer may especially facilitate that (essentially) all of the second light source light (transmitted by the first luminescent layer) may be converted into second luminescent 2024PF80199

[0102] 26

[0103] material light. Hence, such an amount of second luminescent material may facilitate providing first device light (essentially) free from second light source light.

[0104] Alternatively, the second luminescent layer may comprise at least 0.1 times an amount, such as at least 0.2 times an amount, especially at least 0.4 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the second luminescent layer. Additionally or alternatively, the second luminescent layer may comprise at most 1 times an amount, such as at most 0.8 times an amount, especially at most 0.6 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the second luminescent layer. Further, the second luminescent layer may comprise between 0.1 and 1 times an amount, such as between 0.2 and 0.8 times an amount, especially between 0.4 and 0.6 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the second luminescent layer. Hence, in specific embodiments, the second luminescent layer may comprise between 0.2 and 0.8 times an amount of the second luminescent material needed to transmit at most 2% of the second light source light received by the second luminescent layer. Such an amount of second luminescent material in the second luminescent layer may especially facilitate that part of the second light source light may be transmitted by the second luminescent layer, such that the first light generating device may provide first device light comprising second light source light.

[0105] In embodiments, the second luminescent layer may comprise one or more further second luminescent layer luminescent materials, such as selected from the luminescent materials provided above. In such embodiments, relative to a total weight of the second luminescent material and the one or more further second luminescent layer luminescent materials, the second luminescent material may be present (in the second luminescent layer) with a weight percentage of < 98%, such as < 95%, especially < 90%. That is, a luminescent material content of the second luminescent layer may consist for at most 98 wt.%, such as at most 95 wt.%, especially at most 90 wt.%, of the second luminescent material. Alternatively, a luminescent material content of the second luminescent layer may consist for at least 70 wt.%, such as at least 80 wt.%, especially at least 90 wt.%, including (essentially) 100 wt.%, of the second luminescent material. Hence, in specific embodiments, a luminescent material content of the second luminescent layer may consist for at least 80 wt.% of the second luminescent material. Such a luminescent material content may facilitate that the light generated by the second luminescent layer (upon irradiation with second light source light) may largely consist of second luminescent material light. 2024PF80199

[0106] 27

[0107] The first light generating device may be configured to generate first device light. In embodiments, (in an operational mode of the first light generating device,) the first device light may comprises one or more of the first luminescent material light and the second luminescent material light. Especially, in an operational mode of the first light generating device, the first device light may have a spectral power distribution, wherein > 90%, such as > 95%, especially > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light and / or the second luminescent material light. Further, in embodiments, the first device light may be (essentially) free from first light source light (in an operational mode of the first light generating device). Especially, the first device light may have a spectral power distribution, wherein < 5%, such as < 2%, especially < 1%, including (essentially) 0%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. Additionally or alternatively, the first device light may be (essentially) free from second light source light (in an operational mode of the first light generating device). Especially, the first device light may have a spectral power distribution, wherein < 5%, such as < 2%, especially < 1%, including (essentially) 0%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second light source light. Hence, the first device light may in embodiments be free from the first light source light and the second light source light.

[0108] Especially, the first device light may have a spectral power distribution, wherein < 5%, such as < 2%, especially < 1%, including (essentially) 0%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-540 nm. Hence, in specific embodiments, the first device light may have a spectral power distribution, wherein < 2% of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-540 nm. Such first device light may especially (essentially) consist of the first luminescent material light and / or the second luminescent material light. Hence, such first device light may especially be one of orange light and red light, such as especially red light.

[0109] Alternatively, as indicated above, the first device light may comprise (at least) part of the second light source light (in a further operational mode of the first light generating device). Especially, in embodiments, the first device light may have a spectral power distribution, wherein > 2%, such as > 5%, especially > 10%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second light source light.

[0110] Additionally or alternatively, the first device light may have a spectral power distribution, wherein < 35%, such as < 30%, especially < 25%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second light source light. Hence, in specific 2024PF80199

[0111] 28

[0112] embodiments, in a further operational mode of the first light generating device, the first device light may comprise at least part of the second light source light. Such first device light may especially be (warm) white light, thereby providing a first light generating device suitable for general lighting applications.

[0113] Hence, in embodiments, the first device light may comprise at least part of the second light source light (in a further operational mode of the first light generating device). In such embodiments, the first device light may especially be white light. The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1500 K and 20000 K, such as between 2000 and 20000 K, especially between 2700 and 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700-6500 K. In embodiments, the correlated color temperature (CCT) may especially be within about 20 SDCM (standard deviation of color matching) from the BBL (black body locus), such as within 15 SDCM from the BBL, especially within 10 SDCM from the BBL, like within 5 SDCM from the BBL. Hence, in embodiments, (in a further operational mode of the first light generating device,) the first device light may be white light comprising (a) at least part of the second light source light, (b) the second luminescent material light, and optionally (c) the first luminescent material light. Especially, the first device light may be white light having a correlated color temperature (CCT) selected from the range of > 1600 K, such as from the range of > 1700 K, especially from the range of > 1800 K. Additionally or alternatively, the first device light may be white light having a CCT selected from the range of < 3000 K, such as from the range of < 2900 K, especially from the range of < 2700 K. Hence, the first device light may be white light having a CCT selected from the range of 1600-3000 K, such as from the range of 1700-2900 K, especially from the range of 1800-2700 K. Further, the white first device light may have a color rendering index (CRI) of at least 60, such as at least 70, especially at least 75.

[0114] Yet, in embodiments, the luminescent converter may comprise more of the second luminescent material than needed to transmit at most 2% of the second light source light received by the luminescent converter. Hence, in embodiments, the first device light may be (essentially) free from second light source light (and first light source light). In such embodiments, (and in an operational mode of the first light generating device,) the first device light may have a first device centroid wavelength (λcd1). The first device centroid wavelength (λcd1) may be selected from the range of 590-680 nm, such as from the range of 600-660 nm, especially from the range of 610-650 nm, like from the range of 620-640 nm. 2024PF80199

[0115] 29

[0116] That is, in embodiments, the first device light may comprise, such as be, one of orange light and red light, such as especially red light.

[0117] Further, the first light generating device may have a first operational mode and a second operational mode. In the first operational mode, (the first luminescent layer may be configured upstream of the second luminescent layer,) the first solid state light source may be switched on (i.e., the first solid state light source may be configured to emit first light source light in the first operational mode), and the second solid state light source may be switched off (i.e., the second solid state light source may not emit second light source light in the first operational mode). Further, in the second operational mode, the second solid state light source may be switched on, and the first solid state light source may be switched off. Further, in the first operational mode, the first luminescent material may be excited by the first light source light. Hence, in the first operational mode, the first device light may have a spectral power distribution, wherein > 60%, such as > 70%, especially > 80%, of the spectral power in the wavelength range of 600-660 nm may be provided by the first luminescent material light. Further, in the first operational mode, the first device light may have a spectral power distribution, wherein > 90%, such as > 95%, especially > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 600-660 nm may be provided by the first luminescent material light. Additionally or alternatively, in the first operational mode, the first device light may have a spectral power distribution, wherein < 99%, such as < 98%, especially < 95%, of the spectral power in the wavelength range of 600-660 nm may be provided by the first luminescent material light. Further, in the first operational mode, the first device light may have a spectral power distribution, wherein > 60%, such as > 70%, especially > 80%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light. Further yet, in the first operational mode, the first device light may have a spectral power distribution, wherein > 90%, such as > 95%, especially > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light. Additionally or alternatively, in the first operational mode, the first device light may have a spectral power distribution, wherein < 99%, such as < 98%, especially < 95%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light.

[0118] In the second operational mode, the second luminescent material may be excited by the second light source light. Further, in the second operational mode, the first device light may have a spectral power distribution, wherein > 60%, such as > 70%, especially > 80%, of the spectral power in the wavelength range of 600-660 nm may be 2024PF80199

[0119] 30

[0120] provided by the second luminescent material light. Further, in the second operational mode, the first device light may have a spectral power distribution, wherein > 90%, such as > 95%, especially > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 600-660 nm may be provided by the second luminescent material light. Additionally or alternatively, in the second operational mode, the first device light may have a spectral power distribution, wherein < 99%, such as < 98%, especially < 95%, of the spectral power in the wavelength range of 600-660 nm may be provided by the second luminescent material light. Further, in the second operational mode, the first device light may have a spectral power distribution, wherein > 60%, such as > 70%, especially > 80%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light. Further, in the second operational mode, the first device light may have a spectral power distribution, wherein > 90%, such as > 95%, especially > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light. Additionally or alternatively, in the second operational mode, the first device light may have a spectral power distribution, wherein < 99%, such as < 98%, especially < 95%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light. Hence, in specific embodiments, the first light generating device may have a first operational mode and a second operational mode, wherein: (A) in the first operational mode, the first device light may have a spectral power distribution, wherein > 70% of the spectral power in the wavelength range of 600-660 nm may be provided by the first luminescent material light; and (B) in the second operational mode, the first device light may have a spectral power distribution, wherein > 70% of the spectral power in the wavelength range of 600-660 nm may be provided by the second luminescent material light. Such a first light generating device may thus provide narrowband (FWHM₁ ≤ 40 nm) emission in the first operational mode, and broadband (FWHM₂ ≥ 40 nm) emission in the second operational mode. Further, the first luminescent material may provide the first luminescent material light at a relatively higher luminous efficacy (see also below), while the second luminescent material light may have a relatively higher light quality (e.g. a higher CRI and CRI R9 score). Hence, a first light generating device configured to switch between the first operational mode and the second operational mode may facilitate providing either (red) light at a high luminous efficacy, or (red) light having a high light quality.

[0121] In embodiments, the luminescent converter may comprise the first luminescent layer and the second luminescent layer. In such embodiments, in the first operational mode, the first device light may have a first luminous efficacy LE₁. The luminous efficacy may refer 2024PF80199

[0122] 31

[0123] to the amount of lumens (Im) produced per watt (W) of electrical power provided to the first light generating device (such as especially to the solid state light sources). In embodiments, the first luminous efficacy LEi may be selected from the range of > 100 Im / W, such as from the range of > 150 Im / W, especially from the range of > 200 Im / W. Additionally or alternatively, the first luminous efficacy LEi may be selected from the range of < 300 Im / W, such as from the range of < 280 Im / W, especially from the range of < 250 Im / W. Further, the first device light may have a first color rendering index CRIi in the first operational mode. In embodiments, the first color rendering index CRIi may be at least 50, such as at least 55, especially at least 60. Additionally or alternatively, the first device light may have a first CRI R9 score R9i in the first operational mode. In embodiments, the first CRIR9 score R9i may be at least 55, such as at least 65, especially at least 75, like at least 80.

[0124] In embodiments, in the second operational mode, the first device light may have a second luminous efficacy LE2. In embodiments, the second luminous efficacy LE2 may be selected from the range of > 80 Im / W, such as from the range of > 120 Im / W, especially from the range of > 150 Im / W. Additionally or alternatively, the second luminous efficacy LE2 may be selected from the range of < 280 Im / W, such as from the range of < 260 Im / W, especially from the range of < 230 Im / W. Further, in embodiments, LEi > LE2 (may apply), such as (LEi - LE2) > 10 Im / W, especially (LEi - LE2) > 20 Im / W. Additionally or alternatively, in embodiments, (LEi - LE2) < 100 Im / W (may apply), such as (LEi - LE2) < 80 Im / W, especially, (LEi - LE2) < 60 Im / W. Further, the first device light may have a second color rendering index CRI2 in the second operational mode. In embodiments, the second color rendering index CRI2 may be at least 70, such as at least 75, especially at least 80, like at least 85. Further, in embodiments, CRIi < CRI2 (may apply), such as (CRI2 -CRIi) > 2, especially (CRI2 - CRIi) > 5, like (CRI2 - CRIi) > 10. Additionally or alternatively, in embodiments, (CRI2 - CRIi) < 20 (may apply), such as (CRI2 - CRIi) < 18, especially (CRI2 - CRIi) < 15. Additionally or alternatively, the first device light may have a second CRI R9 score R92 in the second operational mode. In embodiments, the second CRI R9 score R92 may be at least 60, such as at least 70, especially at least 80, like at least 90. Further, in embodiments, R9i < R92 (may apply), such as (R92 - R9i) > 2, especially (R92 -R9i) > 5, like (R92 - R9i) > 10. Additionally or alternatively, in embodiments, (R92 - R9i) < 20 (may apply), such as (R92 - R9i) < 15, especially (R92 - R9i) < 10. Hence, in specific embodiments, the luminescent converter may comprise the first luminescent layer and the second luminescent layer, wherein in the first operational mode, the first device light may have a first luminous efficacy LEi, a first color rendering index CRIi, and a first CRI R9 2024PF80199

[0125] 32

[0126] score R9i; wherein in the second operational mode, the first device light may have a second luminous efficacy LE2, a second color rendering index CRI2, and a second CRI R9 score R92; wherein (i) LEi > LE2 and (ii) one or more may apply of CRIi < CRI2 and R9i < R92. Hence, the first light generating device may be configured to either provide (red) light at a high luminous efficacy, or (red) light having a high light quality. Such a first light generating device (and thus such a light generating system) may facilitate that a user may adjust the operational mode of the first light generating device based on the required lighting. For instance, the light generating system may be used as a torch, wherein a high luminous efficacy is desired to provide bright light at a lower power usage. Alternatively, for instance, the light generating system may be used in an art gallery, wherein light quality may be more important than luminous efficacy.

[0127] In embodiments, the first light generating device may have a plurality of operational modes (including the first operational mode and the second operational mode). For each operational mode may apply that the first device light may have a spectral power distribution, wherein xi% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light. Additionally or alternatively, for each operational mode may apply that 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. In embodiments, xi and X2 may be individually selected for each operational mode. Especially, for each operational mode, xi and X2 may be individually selected from the range of 0-100%, such as from the range of 2-98%, especially from the range of 5-95%. Further, in embodiments, xi + X2 > 90% (may apply), such as xi + X2 > 95%, especially xi + X2 > 98%, including (essentially) xi + X2 = 100%. Additionally or alternatively, in embodiments, xi + X2 < 99% (may apply), such as xi + X2 < 98%, especially xi + X2 < 95%. Hence, in specific embodiments, the first light generating device may have a plurality of operational modes, wherein for each operational mode may apply that the first device light may have a spectral power distribution, wherein: (i) xi% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light, and (ii) X2% of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light; wherein xi + X2 > 95%; and wherein xi and X2 may be individually selected for each operational mode. A first light generating device having a plurality of operational modes may allow a user to select a balance between the luminous efficacy and the light quality of the first device light based on their (current) requirements. Hence, such a first light generating device may be especially versatile. 2024PF80199

[0128] 33

[0129] As indicated above, the light generating system may comprise a control system. The control system may be configured to individually control the first solid state light source and the second solid state light source. Especially, the control system may be configured to control an intensity of the first light source light and the second light source light. Further, the control system may be configured to control a spectral power distribution of the first device light (in the wavelength range of 600-660 nm, such as in the wavelength range of 600-700 nm, especially in the wavelength range of 380-780 nm) by controlling the first solid state light source and the second solid state light source. Especially, the control system may be configured to control the contributions of the first luminescent material light and the second luminescent material light to the first device light by controlling the first solid state light source and the second solid state light source. Hence, the control system may be configured to control one or more of a luminous efficacy and a light quality of the first device light. Especially, the control system may be configured to switch the first light generating device from the first operational mode to the second operational mode or vice versa. Further, the control system may be configured to switch the first light generating device between all of the plurality of operational modes. The control system may especially be configured to switch the operational mode of the first light generating device on the basis of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer (see also below). Hence, in specific embodiments, the control system may be configured to switch the first light generating device from the first operational mode to the second operational mode or vice versa on the basis of one or more of an input signal of a user interface, a sensor signal, and a timer. Such a control system may allow a user to switch between operational modes of the first light generating device. Further, such a control system may facilitate autonomously (or automatically) controlling the operational mode of the first light generating device based on e.g. a sensor signal or a timer, thereby providing a more user-friendly light generating system.

[0130] The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein the term “controlling” and similar terms may include imposing behavior on an element and / or monitoring the element. The controlling of the element can be done with a control system. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. The control system and element may not be physically coupled. Control can be done via wired and / or wireless control. A control system may comprise or may be functionally coupled to a user interface. 2024PF80199

[0131] 34

[0132] 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.

[0133] 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 system light may (essentially) consist of the first device light, and the system centroid wavelength (λcc) may be selected from the range of 590-680 nm, such as from the range of 600-660 nm, especially from the range of 610-650 nm, like from the range of 620-640 nm. That is, in embodiments, the system light may comprise, such as be, one of orange light and red light, such as especially red light. Alternatively, the first device light may comprise at least part of the second light source light, and the system light may be white light.

[0134] In embodiments, the light generating system may comprise a LED package. The term “LED package” may refer to a housing comprising one or more solid state light sources (e.g. one or more semiconductor chips) 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, the second solid state light source, and the luminescent converter). Optionally, the LED package (of the light generating system) may further comprise one or more of a reflector, a carrier, one or more optical elements (e.g. a lens, a dome, a diffuser, etc.), electrical connective elements (e.g. wiring), a heat sink, a Zener diode, and one or more further optical and / or electrical components. In embodiments, the LED package may at least comprise a reflective cup. Hence, in specific embodiments, the light generating system may comprises a LED package, wherein the LED package may 2024PF80199

[0135] 35

[0136] comprise the first light generating device. A LED package may provide thermal management for the first solid state light source and the second solid state light source. Further, a LED package may provide light guiding and / or beam shaping for the first device light. Further yet, a LED package may protect the first light generating device against ingress and / or damage.

[0137] The term “LED package” may in general language usage also be indicated as simply “LED”. That is, in general language usage, the term “LED” may be used to refer to a LED package. In embodiments, a LED package may comprise a solid state light source (e.g. a semiconductor chip) configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED. Such an LED (package), which may not comprise a luminescent material, may be indicated as a direct-color LED (dc-LED). Alternatively, the LED package may comprise a solid state light source configured to provide primary radiation, wherein at least part of the primary radiation may be converted into secondary radiation (e.g. by a luminescent material) within the LED package. Such an LED (package) may especially be indicated as a phosphor converted LED or pc-LED. Herein, the LED package (comprising the first light generating device) may especially be based on the conversion of first light source light and / or second light source light by a first luminescent material and / or second luminescent material.

[0138] Hence, the light generating system may comprise (a LED package comprising) the first light generating device. In embodiments, the light generating system may further comprise one or more further light generating devices. The one or more further light generating devices may (each) be configured as a LED package. Alternatively, the first light generating device may be configured in a (single) LED package with the one or more further light generating devices (see also below). Alternatively, the one or more further light generating devices may not be comprised by a LED package. In embodiments, each of the one or more further light generating devices may be configured to generate further device light. The further device light of the one or more further light generating devices may (for each further light generating device) be individually selected from the group of yellow light, green light, blue light, violet light, and white light. The term “yellow light”, and similar terms, may especially relate to light having a wavelength in the range of about 560-590 nm. In embodiments, the system light may comprise the first device light and the further device light of at least one of the one or more further light generating devices. Especially, in an operational mode of the light generating system, the light generating system may be configured to generate system light comprising the first device light and the further device light of at least one of the one or more further light generating devices. In such embodiments, 2024PF80199

[0139] 36

[0140] the system light may especially be white light with 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, in such embodiments, the system light may be white light having a CRI of at least 70, such as at least 80, especially at least 90. In embodiments, the control system may be configured to individually control the first light generating device and the one or more further light generating devices. Hence, in specific embodiments, the light generating system may comprise one or more further light generating devices; wherein each of the one or more further light generating devices may be configured to generate further device light; wherein the further device light of the one or more further light generating devices may be individually selected from the group of yellow light, green light, blue light, violet light, and white light; wherein in an operational mode of the light generating system, the light generating system may be configured to generate system light comprising the first device light and the further device light of at least one of the one or more further light generating devices, wherein the system light may be white light with a CCT selected from the range of 1500-8000 K and a color rendering index of at least 80. Such a light generating system may facilitate providing white light for general lighting applications. Further, a light generating system comprising at least two light generating devices (including the first light generating device) may facilitate adjusting the spectral properties of the system light based on user requirements and / or preferences.

[0141] In embodiments, a LED package may comprise multiple sub-packages, wherein each sub-package may be a LED package as described above. Hence, in embodiments, the light generating system may comprise a LED package comprising the first light generating device and one or more further light generating devices. In such embodiments, as indicated above, each of the first light generating device and 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 may not be configured as a LED package).

[0142] 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, and a third light generating device. In such embodiments, the first device light (of the first light generating device) may have a first device centroid 2024PF80199

[0143] 37

[0144] wavelength (λcd1) selected from the range of 590-680 nm, such as from the range of 600-660 nm, especially from the range of 610-650 nm, like from the range of 620-640 nm.

[0145] The second 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 second light generating device may comprise a second luminescent converter. The second luminescent converter may be configured as a coating on (top of) the third solid state light source. Further, the second luminescent converter may comprise a third luminescent material. The third luminescent material may comprise any (combination) of the luminescent materials indicated above. In specific embodiments, the third luminescent material may comprise one or more luminescent materials of the type A3B5O12:Ce, wherein A may comprise one or more of Y, La, Gd, Tb and Lu, and wherein B may comprise one or more of Al, Ga, In and Sc. The third luminescent material may be configured to convert at least part of the third light source light received by the third luminescent material into third luminescent material light. Especially, the third luminescent material may be configured to convert > 80%, such as > 90%, especially > 95%, including (essentially) 100%, of (a spectral power of) the third light source light received by the third luminescent material into third luminescent material light. The third luminescent material light may have a third centroid wavelength (λc3). Especially, the third centroid wavelength (λc3) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-580 nm. Hence, the third luminescent material light may comprise, such as be, one of green light and yellow light (including some blue and orange tones).

[0146] Further, the second light generating device may be configured to generate second device light. The second device light may comprise the third luminescent material light. Further, in embodiments, the second device light may comprise the third light source light. Yet, especially, the second device light may (essentially) consist of the third luminescent material light. The second device light may have a second device centroid wavelength (λcd2). The second device centroid wavelength (λcd2) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 2024PF80199

[0147] 38

[0148] 500-580 nm. That is, the second device light may comprise, such as be, one of green light and yellow light. Especially, the second device light may be green light. Hence, in specific embodiments, the second light generating device may comprise a second luminescent converter; wherein the third solid state light source may be configured to generate third light source light having a third peak wavelength (λp3) selected from the range of 380-490 nm; wherein the second luminescent converter may comprise a third luminescent material, wherein the third luminescent material may be configured to convert at least part of the third light source light received by the third luminescent material into third luminescent material light, wherein the third luminescent material light may have a third centroid wavelength (λc3) selected from the range of 490-590 nm; and wherein the second device light may comprise the third luminescent material light. A second light generating device providing (yellow light or) green light based on the conversion of blue light by a luminescent material may be more energy efficient than a second light generating device comprising a third solid state light source (directly) providing said (yellow light or) green light.

[0149] As indicated above, the LED package may further comprise a third light generating device. The third 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 especially have a fourth peak emission wavelength (λp4) 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 light source light may be one of violet light and blue light, such as especially blue light. The third light generating device may be configured to generate third device light. The third device light may comprise the fourth light source light. In specific embodiments, the third device light may (essentially) consist of the fourth light source light. In such embodiments, the third light generating device may comprise a light transparent coating, configured on top of (and in physical contact with) a light escape surface of the 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, Al2O3and TiO2particles. Further, the third device light may have a third device centroid wavelength (λcd2). In embodiments, the third device centroid wavelength (λcd3) may be 2024PF80199

[0150] 39

[0151] 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 third device light may be one of violet light and blue light, such as especially blue light.

[0152] 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, and the third 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. Especially, in at least one operational mode of the light generating system (comprising the LED package), the system light may be white light. In such embodiments, the system light may especially comprise the first device light, the second device light, and the third device light. 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 color rendering index (CRI) of at least 75, such as at least 80, especially at least 85. The system light may have a CRI R9 score of > 60, such as > 65, especially > 70.

[0153] As indicated above, the light generating system may comprise the 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 490-780 nm by 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 color point, CCT, CRI, and intensity of the system light (by individually controlling the first, second, and third light generating devices). Hence, in specific embodiments, the light generating system may comprise a LED package, wherein the LED package may comprise the first light generating device, a second light generating device, and a third light generating device, wherein: (A) the second light generating device may comprise a third solid state light source, wherein the second light generating device may be configured to generate second device light having a 2024PF80199

[0154] 40

[0155] second device centroid wavelength (λcd2) selected from the range of 490-590 nm; (B) the third light generating device may comprise a fourth 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 430-490 nm; (C) 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, and the third device light; and (D) 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; wherein the control system may be configured to control a spectral power distribution of the system light in the wavelength range of 490-780 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.

[0156] In embodiments, the LED package may further comprise a fourth light generating device. The fourth light generating device may especially comprise a fifth solid state light source and a third luminescent converter. The fifth 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 fifth solid state light source may be configured to generate fifth light source light. The fifth light source light may have a fifth peak emission wavelength (λp5) 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 fifth light source light may be one of violet light and blue light, such as especially blue light. Further, the third 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 A3B5O12:Ce, wherein A may comprise one or more of Y, La, Gd, Tb and Lu, and wherein B may comprise one or more of Al, Ga, In and Sc. Additionally or alternatively, the fourth luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation (especially an alkaline cation), x is in the range of 0-1, A comprises a tetravalent cation (comprising one or more of Si, Ti, and Ge), and X comprises a monovalent 2024PF80199

[0157] 41

[0158] anion, at least comprising fluorine. Further, the fourth luminescent material may comprise one or more of a divalent europium comprising oxynitride luminescent material, a divalent europium comprising nitride luminescent material, a luminescent material of the type MAlSiN₃:Eu2+, an SLA-type phosphor, and a SiAlON-type phosphor. Hence, in embodiments, the fourth luminescent material may comprise a primary fourth luminescent material configured to generate one of yellow light and green light, and a secondary fourth luminescent material configured to generate one of orange light and red light.

[0159] The fourth luminescent material may be configured to convert at least part of the fifth light source light received by the fourth luminescent material into fourth luminescent material light. Especially, the fourth luminescent material may be configured to convert > 75%, such as > 80%, especially > 85%, like > 90%, of (a spectral power of) the fifth light source light received by the fourth luminescent material into fourth luminescent material light. Additionally or alternatively, the fourth luminescent material may be configured to convert < 98%, such as < 95%, especially < 90%, of (a spectral power of) the fifth light source light received by the fourth luminescent material into fourth luminescent material light. The fourth luminescent material light may have a fourth centroid wavelength ( C4). Especially, the fourth centroid wavelength ( C4) may be selected from the range of 500-650 nm, such as from the range of 515-630 nm, especially from the range of 530-600 nm. Further, the fourth light generating device may be configured to generate fourth device light. In embodiments, the fourth device light may comprise the fourth luminescent material light. Additionally, the fourth device light may comprise (at least) part of the fifth light source light. Especially, the fourth device light may have a spectral power distribution, wherein > 1%, such as > 2%, especially > 5%, of the spectral power in the wavelength range of 380-780 nm may be provided by the fifth light source light. Additionally or alternatively, the fourth device light may have a spectral power distribution, wherein < 15%, such as < 12%, especially < 10%, of the spectral power in the wavelength range of 380-780 nm may be provided by the fifth light source light. The fourth device light may in embodiments be white light. Especially, the fourth device light may be white light having a CCT selected from the range of 1300-8500 K, such as from the range of 1500-8000 K, especially from the range of 1700-7500 K. Further, the fourth device light may have a CRI of at least 70, such as at least 75, especially at least 80.

[0160] In embodiments, the system light may comprise the fourth device light. Hence, the system light may comprise one or more of (i) red first device light, (ii) (yellow or) green second device light, (iii) blue third device light, and (iv) white fourth device light. Especially, 2024PF80199

[0161] 42

[0162] the system light may comprise the fourth device light and one or more of the first device light, second device light, and third device light, wherein the system light may be white light. Alternatively, the system light may comprise the fourth device light and one or more of the first device light, second device light, and third device light, wherein the system light may be colored light. Further, the system light may comprise at least two of the first device light, second device light, and third device light (and not comprise the fourth device light), wherein the system light may be white light. Alternatively, the system light may comprise one or more of the first device light, second device light, and third device light (and not comprise the fourth device light), wherein the system light may be colored light.

[0163] 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 individually control an intensity of the first device light, the second device light, the third device light, and the fourth device light.

[0164] 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, the fourth solid state light source, and the fifth 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. Likewise, the phrase “identical light sources”, and similar phrases, may refer to a plurality of solid-state light sources selected from the same bin.

[0165] 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 “CoB” especially refers to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of light emitting semiconductor light sources may be configured on the same substrate. In embodiments, a CoB is a multi LED chip configured together as a single lighting module.

[0166] 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 2024PF80199

[0167] 43

[0168] 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.

[0169] 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 μm – 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 μm and smaller.

[0170] 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.

[0171] The term “light source” may refer to a semiconductor light-emitting device, such as an LED, a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In an embodiment, the light source comprises a LED. The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). Especially, the term “solid state light source” may refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, a superluminescent diode, or a multi -junction diode.

[0172] The light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, or downstream of a plurality of solid-state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise a LED with on-chip optics. The light source may comprise pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). In embodiments, the light source may be a dc-LED. Alternatively, the light source may be a pc-LED. Hence, the term “light source” may refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more optics, like a lens, a collimator. In embodiments, the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light 2024PF80199

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[0174] 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.

[0175] 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.

[0176] In embodiments, the term “laser light source” may also refer to a plurality of (different or identical) laser light sources. In specific embodiments, the term “laser light source” may refer to a plurality N of (identical) laser light sources. In embodiments, N>2, such as N>5, especially N>8. In this way, a higher brightness (of the laser light) may be obtained. Laser light sources may be arranged in a laser bank. The laser bank may comprise heat sinking and / or optics (e.g. a lens to collimate the laser light). Hence, in embodiments lasers in a laser bank (or “laser array bank”) may share the same optics.

[0177] The laser light source may be configured to generate laser light source light (or “laser light”). The light source light may essentially consist of the laser light source light. The light source light may also comprise laser light source light of two or more (different or identical) laser light sources. For instance, the laser light source light of two or more (different or identical) laser light sources may be coupled into a light guide, to provide a single beam of light comprising the laser light source light of the two or more (different or 2024PF80199

[0178] 45

[0179] identical) laser light sources. The light source light may thus be collimated (laser) light source light. The laser light source light may comprise one or more bands, having band widths as known for lasers. In embodiments, the band(s) may be relatively sharp line(s), such as having full width half maximum (FWHM) in the range of <20 nm at RT, such as <10 nm. Hence, the light source light may have a spectral power distribution (intensity on an energy scale as function of the wavelength) which may comprise one or more (narrow) bands. The beams (of light source light) may be focused or collimated beams of (laser) light source light. The term “focused” may especially refer to converging to a small spot. Focusing (of the laser light source light) may be executed with one or more optics, such as especially two (focusing) lenses. Collimation may be executed with one or more (other) optics, like collimation elements, such as lenses and / or parabolic mirrors. In embodiments, the beam of (laser) light source light may be relatively highly collimated, such as in embodiments <2° (FWHM), more especially <1° (FWHM), most especially <0.5° (FWHM).

[0180] In embodiments, the light generating system may comprise a Chip-on-Board (CoB). As indicated above, the term “CoB” may especially refer to LED chips in the form of a semiconductor chip that is directly mounted onto a substrate. Hence, the Chip-on-Board may comprise a plurality of the first solid state light source and a plurality of the second solid state light source (mounted onto a substrate). Further, in embodiments, the Chip-on-Board may comprise the luminescent converter (configured as a coating). The luminescent converter (optionally comprising the first luminescent layer and the second luminescent layer) may be configured on top of (and in physical contact with) the plurality of first solid state light sources and the plurality of second solid state light sources. Hence, in specific embodiments, the light generating system may comprise a Chip-on-Board, wherein the Chip-on-Board may comprise (i) a plurality of the first solid state light source, (ii) a plurality of the second solid state light source, and (iii) the luminescent converter, wherein the luminescent converter may be configured on top of the plurality of first solid state light sources and the plurality of second solid state light sources.

[0181] The light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems (e.g. a torch), automotive lighting devices, stage-lighting devices, (outdoor) road lighting systems, urban 2024PF80199

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[0183] 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.

[0184] 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. The lighting fixture may e.g. be a chandelier, yet may in embodiments also be a stage lighting device. 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, 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.

[0185] 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.

[0186] BRIEF DESCRIPTION OF THE DRAWINGS

[0187] 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:

[0188] Fig. 1 schematically depicts an embodiment of the light generating system; 2024PF80199

[0189] 47

[0190] Fig. 2 schematically depicts an embodiment of the light generating system comprising a LED package; and

[0191] Fig. 3 schematically depicts an embodiment of the lighting device.

[0192] The schematic drawings are not necessarily to scale.

[0193] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0194] Fig. 1 A schematically depicts an embodiment of the light generating system 1000. The light generating system 1000 may comprise a first light generating device 110 and a control system 300. Further, the first light generating device 110 may comprise a first solid state light source 10, a second solid state light source 20, and a luminescent converter 2000. The first solid state light source 10 may be configured to generate first light source light 11 having a first peak wavelength (λp1) selected from the range of 400-490 nm. Additionally, the second solid state light source 20 may be configured to generate second light source light 21 having a second peak wavelength (λp2) selected from the range of 470-540 nm. In embodiments, λp2 - λp1 ≥ 20 nm (may apply). The luminescent converter 2000 may be configured in a light receiving relationship with the first solid state light source 10 and the second solid state light source 20. Further, the luminescent converter 2000 may comprise a first luminescent material 210 and a second luminescent material 220. The first luminescent material 210 may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation (especially an alkaline cation), and x is in the range of 0-1, wherein A comprises a tetravalent cation, (comprising one or more of silicon, titanium, and germanium,) and wherein X comprises a monovalent anion, at least comprising fluorine. Further, the first luminescent material 210 may be configured to convert at least part of the first light source light 11 received by the first luminescent material 210 into first luminescent material light 211. Especially, the first luminescent material light 211 may have a first centroid wavelength (λc1) selected from the range of 610-650 nm. Additionally, the first luminescent material light 211 may comprise at least one emission band having a first full width at half maximum FWHMi of < 40 nm. The second luminescent material 220 may be configured to convert at least part of the second light source light 21 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. Further, the second luminescent material light 221 may comprise at least one emission band having a second full width at half maximum FWHM2 of > 40 nm. The first light generating 2024PF80199

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[0196] device 110 may be configured to generate first device light 111. In an operational mode of the first light generating device 110, the first device light 111 may comprise one or more of the first luminescent material light 211 and the second luminescent material light 221.

[0197] Especially, the first device light 111 may have a first device centroid wavelength (λcd1) selected from the range of 600-660 nm. Further, the control system 300 may be configured to individually control the first solid state light source 10 and the second solid state light source 20. Especially, the control system 300 may be configured to control a spectral power distribution of the first device light 111 by controlling the first solid state light source 10 and the second solid state light source 20.

[0198] The light generating system 1000 may comprise a LED package 500. The LED package 500 may especially comprise the first light generating device 110. Further, the LED package 500 may comprise one or more optical and / or electrical components. For instance, the LED package 500 may comprise a reflector 510, wherein the LED package 500 may especially comprise a reflective cup comprising the reflector 510 (as an inner lining).

[0199] Fig. IB schematically depicts a further embodiment of the light generating system 1000. The first light generating device 110 may have a first operational mode and a second operational mode. In the first operational mode, the first device light 111 may have a spectral power distribution, wherein > 70% of the spectral power in the wavelength range of 600-660 nm may be provided by the first luminescent material light 211. The first operational mode is schematically depicted in Fig. 1B(I). Further, in the second operational mode, the first device light 111 may have a spectral power distribution, wherein > 70% of the spectral power in the wavelength range of 600-660 nm may be provided by the second luminescent material light 221. The second operational mode is schematically depicted in Fig. 1B(II).

[0200] The control system 300 may be configured to switch the first light generating device 110 from the first operational mode to the second operational mode or vice versa on the basis of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. Further, the control system 300 may be configured to switch the first light generating device 110 between a plurality of operational modes. Hence, the first light generating device 110 may have a plurality of operational modes. For each operational mode may apply that the first device light 111 may have a spectral power distribution, wherein: (i) xi% of the spectral power in the wavelength range of 380-780 nm may be provided by the first luminescent material light 211, and (ii) X2% of the spectral power in the wavelength range of 380-780 nm may be provided by the second luminescent material light 221. In embodiments, xi + X2 > 95% (may apply). Further, xi and X2 may be individually selected for 2024PF80199

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[0202] each operational mode. Fig. IB(III) schematically depicts an embodiment of the first light generating device 110 wherein xi > 1% and X2 > 1%.

[0203] As depicted in Fig. IB, the luminescent converter 2000 may comprise a first luminescent layer 2100 and a second luminescent layer 2200. The first luminescent layer 2100 and the second luminescent layer 2200 may be configured downstream of the first solid state light source 10 and the second solid state light source 20. Further, one of the first luminescent layer 2100 and the second luminescent layer 2200 may be configured downstream from the other (one) of the first luminescent layer 2100 and the second luminescent layer 2200. The first luminescent layer 2100 may especially comprise the first luminescent material 210. Further, the second luminescent layer 2200 may comprise the second luminescent material 220. Especially, the first luminescent layer 2100 may be configured upstream of the second luminescent layer 2200. In such embodiments, the first luminescent layer 2100 may be configured to transmit at least 70% of the second light source light 21 received by the first luminescent layer 2100.

[0204] Fig. 1B(I) schematically depicts an embodiment of the light generating system 1000 (with the first light generating device 110 in the first operational mode). The luminescent converter 2000 (especially the first luminescent layer 2100) may comprise at least 1.2 times an amount of the first luminescent material 210 needed to transmit at most 2% of the first light source light 11 received by the luminescent converter 2000 (especially by the first luminescent layer 2100). Hence, in embodiments, the first luminescent layer 2100 may be configured to transmit < 2% of the first light source light 11 to the second luminescent layer 2200. Further, the second luminescent material 220 may be configured to convert at least part of the first light source light 11 received by the second luminescent material 220 into second luminescent material light 221.

[0205] Fig. 1B(II) schematically depicts an embodiment of the light generating system 1000 (with the first light generating device 110 in the second operational mode). The luminescent converter 2000 (especially the second luminescent layer 2200) may comprise at least 1.2 times an amount of the second luminescent material 220 needed to transmit at most 2% of the second light source light 21 received by the luminescent converter 2000 (especially by the second luminescent layer 2200). Conversely, the luminescent converter 2000 (especially the second luminescent layer 2200) may comprise between 0.2 and 0.8 times an amount of the second luminescent material 220 needed to transmit at most 2% of the second light source light 21 received by the luminescent converter 2000 (especially by the second luminescent layer 2200). In such embodiments, and in a further operational mode of the first 2024PF80199

[0206] 50

[0207] light generating device 110, the first device light 111 may comprise at least part of the second light source light 21. The second luminescent material 220 may especially comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, SiAlON phosphors, and luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba.

[0208] Fig. IB(III) schematically depicts a further embodiment of the light generating system 1000. The first device light 111 may comprise at least part of the second light source light 21 (and / or the first light source light 11). Yet, especially, the first device light 111 may have a spectral power distribution, wherein < 2% of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-540 nm. Hence, the first device light 111 may be (essentially) free from the first and second light source light 11,21.

[0209] Fig. 2 schematically depicts an embodiment of the light generating system 1000 comprising (a LED package 500 comprising the first light generating device 110 and) one or more further light generating devices 100. Each of the one or more further light generating devices 100 may be configured to generate further device light 101. Especially, the further device light 101 of the one or more further light generating devices 100 may be individually selected from the group of yellow light, green light, blue light, violet 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 device light 111 and the further device light 101 of at least one of the one or more further light generating devices 100. The system light 1001 may especially be white light with a CCT selected from the range of 1500-8000 K and a color rendering index of at least 80.

[0210] Hence, the light generating system 1000 may comprise a LED package 500 (comprising the first light generating device 110 and one or more further light generating devices 100). Especially, the LED package 500 may comprise the first light generating device 110, a second light generating device 120, and a third light generating device 130. The second light generating device 120 may comprise a third solid state light source 30. Further, the second light generating device 120 may be configured to generate second device light 121 having a second device centroid wavelength (λcd2) selected from the range of 490-590 nm. Especially, the second device light 121 may be green light. The third light generating device 130 may comprise a fourth solid state light source 40 (configured to generate fourth light source light 41). Further, the third light generating device 130 may be configured to generate third device light 131 having a third device centroid wavelength (λcd3) selected from the 2024PF80199

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[0212] range of 430-490 nm. Especially, the third device light 131 may (essentially) consist of the fourth light source light 41. Further, the third device light 131 may be violet light or blue light, such as especially 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, and the third device light 131. Further, the control system 300 may be configured to individually control the first light generating device 110, the second light generating device 120, and the third light generating device 130. Especially, the control system 300 may be configured to control a spectral power distribution of the system light 1001 in the wavelength range of 490-780 nm by controlling the first light generating device 110, the second light generating device 120, and the third light generating device 130. The system light may especially have a color point selected from the CIE 1931 color space.

[0213] The third solid state light source 30 may be configured to generate third light source light 31 having a third peak wavelength (λp3) 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 third luminescent material 230. The third luminescent material 230 may be configured to convert at least part of the third light source light 31 received by the third luminescent material 230 into third luminescent material light 231. The third luminescent material light 231 may have a third centroid wavelength (λc3) selected from the range of 490-590 nm. Further, the second device light 121 may comprise (or essentially consist of) the third luminescent material light 231.

[0214] The LED package 500 may further comprise a fourth light generating device 140. The fourth light generating device 140 may comprise a fifth solid state light source 50. The fifth solid state light source 50 may be configured to generate fifth light source light 51. Further, the fourth light generating device 140 may comprise a third luminescent converter 2030. The third luminescent converter 2030 may comprise a fourth luminescent material 240. The fourth luminescent material 240 may especially be configured to convert at least part of the fifth light source light 51 received by the fourth luminescent material 240 into fourth luminescent material light 241. Further, the fourth light generating device 140 may be configured to generate fourth device light 141. The fourth device light 141 may comprise the fourth luminescent material light 241. Additionally, the fourth device light 141 may comprise at least part of the fifth light source light 51. The fourth device light 141 may especially be white light (such as white light having a CCT selected from the range of 1300-8500 K). 2024PF80199

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[0216] Fig. 3 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. 3 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. 3 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.

[0217] The term “plurality” refers to two or more. The terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein the term “comprises” means “consists of’. The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term “comprising” may in an embodiment refer to “consisting of’ but may in another embodiment also refer to “containing at least the defined species and optionally one or more other species”. Use of the verb “to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. 2024PF80199

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[0219] 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.

[0220] 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.

[0221] 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.

[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

2024PF8019954CLAIMS:

1. A light generating system (1000) comprising a first light generating device (110) and a control system (300), wherein the first light generating device (110) comprises a first solid state light source (10), a second solid state light source (20), and a luminescent converter (2000), wherein:the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 400-490 nm;the second solid state light source (20) is configured to generate second light source light (21) having a second peak wavelength (λp2) selected from the range of 470-540 nm; wherein Zp2 - Api > 20 nm;the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10) and the second solid state light source (20); wherein the luminescent converter (2000) comprises a first luminescent material (210) and a second luminescent material (220);the first luminescent material (210) comprises a luminescent material of the type M’XM2-2XAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); wherein the first luminescent material light (211) has a first centroid wavelength (λc1) selected from the range of 610-650 nm; wherein the first luminescent material light (211) comprises at least one emission band having a first full width at half maximum FWHMi of < 40 nm;the second luminescent material (220) is configured to convert at least part of the second light source light (21) 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; wherein the second luminescent material light (221) comprises at least one emission band having a second full width at half maximum FWHM2 of > 40 nm;2024PF8019955the first light generating device (110) is configured to generate first device light (111); wherein in an operational mode of the first light generating device (110), the first device light (111) comprises one or more of the first luminescent material light (211) and the second luminescent material light (221); wherein the first device light (111) has a first device centroid wavelength (λcd1) selected from the range of 600-660 nm; andthe control system (300) is configured to individually control the first solid state light source (10) and the second solid state light source (20); wherein the control system (300) is configured to control a spectral power distribution of the first device light (111) by controlling the first solid state light source (10) and the second solid state light source (20).

2. The light generating system (1000) according to claim 1, wherein the luminescent converter (2000) comprises a first luminescent layer (2100) and a second luminescent layer (2200); wherein the first luminescent layer (2100) and the second luminescent layer (2200) are configured downstream of the first solid state light source (10) and the second solid state light source (20); and wherein one of the first luminescent layer (2100) and the second luminescent layer (2200) is configured downstream from the other of the first luminescent layer (2100) and the second luminescent layer (2200); wherein the first luminescent layer (2100) comprises the first luminescent material (210); and wherein the second luminescent layer (2200) comprises the second luminescent material (220).

3. The light generating system (1000) according to claim 2, wherein the first luminescent layer (2100) is configured upstream of the second luminescent layer (2200); wherein the first luminescent layer (2100) is configured to transmit at least 70% of the second light source light (21) received by the first luminescent layer (2100).

4. 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, SiAlON phosphors, and luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba.

5. The light generating system (1000) according to any one of the preceding claims, wherein the first luminescent material (210) consists for at least 80% of luminescent2024PF8019956materials of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine.

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

7. The light generating system (1000) according to any one of the preceding claims, wherein the luminescent converter (2000) comprises at least 1.2 times an amount of the second luminescent material (220) needed to transmit at most 2% of the second light source light (21) received by the luminescent converter (2000).

8. The light generating system (1000) according to any one of the preceding claims, wherein the first device light (111) has a spectral power distribution, wherein < 2% of the spectral power in the wavelength range of 380-780 nm is in the wavelength range of 380-540 nm.

9. The light generating system (1000) according to any one of the preceding claims 1-5, wherein the first light generating device (110) has a first operational mode and a second operational mode, wherein:in the first operational mode, the first device light (111) has a spectral power distribution, wherein > 70% of the spectral power in the wavelength range of 600-660 nm is provided by the first luminescent material light (211); andin the second operational mode, the first device light (111) has a spectral power distribution, wherein > 70% of the spectral power in the wavelength range of 600-660 nm is provided by the second luminescent material light (221).

10. The light generating system (1000) according to claim 9, wherein the luminescent converter (2000) comprises the first luminescent layer (2100) and the second luminescent layer (2200) as defined in claim 2, wherein in the first operational mode, the first device light (111) has a first luminous efficacy LEi, a first color rendering index CRIi, and a2024PF8019957first CRI R9 score R9i; wherein in the second operational mode, the first device light (111) has a second luminous efficacy LE2, a second color rendering index CRI2, and a second CRI R9 score R92; wherein (i) LEi > LE2 and (ii) one or more applies of CRIi < CRI2 and R9i < R92.

11. The light generating system (1000) according to any one of the preceding claims, wherein one or more applies of (a) the first peak wavelength (λp₁) is selected from the range of 440-465 nm; and (b) the second peak wavelength (λp₂) is selected from the range of 500-540 nm.

12. The light generating system (1000) according to any one of the preceding claims, wherein the light generating system (1000) comprises a LED package (500), wherein the LED package (500) comprises the first light generating device (110).

13. The light generating system (1000) according any one of the preceding claims, wherein the light generating system (1000) comprises one or more further light generating devices (100); wherein each of the one or more further light generating devices (100) is configured to generate further device light (101); wherein the further device light (101) of the one or more further light generating devices (100) is individually selected from the group of yellow light, green light, blue light, violet light, and white light; wherein in an operational mode of the light generating system (1000), the light generating system (1000) is configured to generate system light (1001) comprising the first device light (111) and the further device light (101) of at least one of the one or more further light generating devices (100), wherein the system light (1001) is white light with a CCT selected from the range of 1500-8000 K and a color rendering index of at least 80.

14. The light generating system (1000) according to any one of the preceding claims, wherein the light generating system (1000) comprises a LED package (500), wherein the LED package (500) comprises the first light generating device (110), a second light generating device (120), and a third light generating device (130), wherein:the second light generating device (120) comprises a third solid state light source (30), 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 490-590 nm;2024PF8019958the third light generating device (130) comprises a fourth solid state light source (40), 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 430-490 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), and the third device light (131); andthe control system (300) is configured to individually control the first light generating device (110), the second light generating device (120), and the third light generating device (130); wherein the control system (300) is configured to control a spectral power distribution of the system light (1001) in the wavelength range of 490-780 nm by controlling the first light generating device (110), the second light generating device (120), and the third light generating device (130).

15. 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) according to any one of the preceding claims.

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