White LED with at least P1F3 light quality

Abstract

The present invention provides a light generating system (1000) comprising a light generating device (100) and two or more luminescent materials (200) wherein: (A) the light generating device (100) is configured to generate device light (101) having a peak wavelength selected from the wavelength range of 440 nm to 465 nm; wherein the light generating device (100) comprises a solid state light source; (B) the two or more luminescent materials comprise (i) a first luminescent material (210) configured to convert at least a portion of the device light (101) into first luminescent material light (211) having a spectral power in the green-yellow wavelength range, a full width at half maximum of at least 50 nm, and a color point u 'tellow, v' tellow; (ii) optionally, a second luminescent material (220) configured to convert at least a portion of the device light (101) into second luminescent material light (221) having a spectral power in the orange red wavelength range, a full width at half maximum of at least 50 nm, and a color point u'red, v'red; and (iii) a third luminescent material (230) configured to convert at least a portion of the device light (101) into third luminescent material light (231) in the orange red wavelength range, wherein the third luminescent material (230) comprises M'xM2-2xAX6 doped with tetravalent manganese, where M 'comprises an alkaline earth cation, where M comprises a cation, x is in the range of 0-1, where A comprises a tetravalent cation, where X comprises a monovalent anion, at least comprising fluorine; and (C) the light generating system (1000) configured to generate system light (1001) comprising (i) at least a portion of the first device light (101), (ii) at least a portion of the first luminescent material light (211), and (iii) at least a portion of the third luminescent material light (231); wherein the system (1000) is configured such that the system light (1001) is white light having a correlated color temperature (CCT) selected from the range of 1800-6500 K, an Rf value of at least 85, an Rf, h1 value of at least 85, an Rg value of at least 95, and an Rcs, h1 value of at least-1%, where Rf, Rf, h1, Rg and Rcs, h1 are defined according to the TM-30 (2020) standard ANSI / IES TM-30-20: IES Light Source Color Reproduction Assessment Method.

Description

Technical Field

[0001] The present invention relates to a light generation system and an illumination device including such a light generation system. Background Art

[0002] White light emitting illumination devices are known in the art. For example, US2015287890 describes a white light emitting illumination device that includes one or more light emitting light sources (preferably solid state semiconductor light emitting diodes) that emit off-white light during operation, and an optical component, where the off-white light includes a spectral output that includes at least one spectral component in a first spectral region of from about 360 nm to about 475 nm, at least one spectral component in a second spectral region of from about 475 nm to about 575 nm, and at least one defect in at least one other spectral region, the optical component being positioned to receive at least a portion of the off-white light generated by the one or more light sources, the optical component including an optical material that is configured to convert at least a portion of the off-white light into one or more predetermined wavelengths (at least one of the predetermined wavelengths having a wavelength in at least one of the defect spectral regions) such that the light emitted by the illumination device includes white light, where the optical material includes quantum-confined semiconductor nanoparticles. Summary of the Invention

[0003] There is a desire to provide illumination devices and light generation systems that meet desired illumination quality standards. Additionally, there is a desire to meet these standards in the most efficient manner. Current illumination devices and / or light generation systems may not meet these standards, or may meet these standards with less efficient solutions. Accordingly, one aspect of the present invention is to provide an alternative light generation system (and / or illumination device) that preferably further at least partially eliminates one or more of the above disadvantages. An object of the present invention may be to overcome or improve at least one of the disadvantages of the prior art, or to provide a useful alternative. It does not appear obvious to meet, for example, Priority 1 and Fidelity 3 (also referred to herein as P1F3), such as those described in the TM-30(2020) standard [ANSI / IES TM-30-20: IES Method for Evaluating Light Source Color Rendering]. https: / / store.ies.org / product / tm-30-20-ies-method-for-evaluating-light-source-color-rendition / (see Table E-2) Numerous simulations have been performed, and it appears that essentially only specific conditions can meet the requirements of, for example, P1F3 and / or P2F3 (Priority 2 and Fidelity 3) with reasonable or high energy efficiency.

[0004] According to a first aspect, the present invention provides a light generation system ("system") that includes a light generation device and two or more luminescent materials. In an embodiment, the light generation device may be configured to generate device light having a peak wavelength (PWL) within a wavelength range selected from 440 nm - 465 nm. In particular, the light generation device may include a solid-state light source. Additionally, in particular, the two or more luminescent materials may include a first luminescent material configured to convert at least a portion of the device light into first luminescent material light, which particularly has spectral power within the green-yellow wavelength range. In an embodiment, the first luminescent material light may have a full width at half maximum (FWHM) of at least 50 nm. Additionally, the first luminescent material light may have chromaticity coordinates u' yellow , v' yellow . Optionally, the two or more luminescent materials may include a second luminescent material configured to convert at least a portion of the device light into second luminescent material light, which particularly has spectral power within the orange-red wavelength range. In an embodiment, the second luminescent material light may have a FWHM of at least 50 nm and chromaticity coordinates u' red , v' red . Additionally, in an embodiment, the two or more luminescent materials may include a third luminescent material configured to convert at least a portion of the device light into third luminescent material light within the orange-red wavelength range. In a particular embodiment, the third luminescent material may include M' x M 2-2x AX6 doped with tetravalent manganese, where M' includes alkaline earth cations, where M includes cations, x is in the range of 0 - 1, where A includes tetravalent cations, where X includes monovalent anions, including at least fluorine. Additionally, in particular, the light generation system is configured to generate system light. In an embodiment, the spectral power distribution of the system light may include (i) at least a portion of the device light, (ii) at least a portion of the first luminescent material light, and (iii) at least a portion of the third luminescent material light. In an embodiment, the system may be configured such that the system light is white light having a correlated color temperature (CCT) within a range selected from 1800 K - 6500 K. Additionally, in an embodiment, the system is configured such that the system light may have one or more of the following: (i) an R f value of at least 85, (ii) an R f,h1 value of at least 85, (iii) an R g value of at least 95, and (iv) an R cs,h1 value of at least -1%. In particular, R f , R f,h1 , R g and R cs,h1Defined according to the TM-30 (2020) standard ANSI / IES TM-30-20: IES Method for Evaluating Light Source Color Rendering. Additionally, in an embodiment, the contribution of the third luminescent material light to the spectral power distribution of the system light in the wavelength range of 380 nm - 780 nm can be defined as fraction G. In an embodiment, the following can apply: (a) When the system light (also) includes the second luminescent material light, fraction G can be selected from the range of 0.95*G’ - 1.05*G’, where G’ conforms to the following formula: G’ = 1.4421 - 2.904125*

[0005] 10 -8 *PWL - 10.08921*u’ Yellow -0.5457286*u’ Red -1.074782*10 -4 *CCT +

[0006] 21.623*[u’ Yellow 2 -1.639*[u’ Red 2 +4.921703*10 -9 *[CCT] 2 +2.316461*

[0007] 10 -7 *[PWL*u’ Red +7.268292*[u’ Yellow *u’ Red +9.309924*10 -5 *[u’ Red *CCT]; and wherein in a particular embodiment, fraction G can be at least 0.05 and at most 0.2. In (other) embodiments, the following can apply: (b) When the system light does not include the second luminescent material light, the following can apply: u’ Yellow ≥0.95*(0.2546 - 0.000016*CCT), and fraction G can be at least 0.05 and at most 0.2. Accordingly, the present invention provides in an embodiment a light generation system that includes a light generation device and two or more luminescent materials, wherein: (A) The light generation device is configured to generate device light having a peak wavelength selected from the wavelength range of 440 nm - 465 nm; wherein the light generation device includes a solid-state light source; (B) The two or more luminescent materials include (i) a first luminescent material that is configured to convert at least a portion of the device light into first luminescent material light having a spectral power in the green-yellow wavelength range (specifically in the range of 490 nm - 590 nm), a full width at half maximum of at least 50 nm, and a color point u’​​yellow and v' yellow ; (ii) Optionally, a second light-emitting material configured to convert at least a portion of the device light into second light-emitting material light having spectral power in the orange-red wavelength range (specifically in the range of 590 nm - 680 nm), a full width at half maximum of at least 50 nm, and color point u' red and v' red ; and (iii) A third light-emitting material configured to convert at least a portion of the device light into third light-emitting material light in the orange-red wavelength range (specifically in the range of 590 nm - 680 nm), wherein the third light-emitting material comprises M' doped with tetravalent manganese x M 2-2x AX6, where M' comprises an alkaline earth cation, where M comprises a cation, x is in the range of 0 - 1, where A comprises a tetravalent cation, where X comprises a monovalent anion, including at least fluorine; (C) The light generation system is configured to generate system light, the system light comprising (i) at least a portion of the device light, (ii) at least a portion of the first light-emitting material light, and (iii) at least a portion of the third light-emitting material light; wherein the system is configured such that the system light is white light having a correlated color temperature (CCT) selected from the range of 1800K - 6500K, an R f value of at least 85, an R f,h1 value of at least 85, an R g value of at least 95, an R cs,h1 value of at least -1%, where R f , R f,h1 , R g and R cs,h1 are defined according to the TM-30(2020) standard ANSI / IES TM-30-20: IES Method for Evaluating the Color Rendering of Light Sources, where the contribution of the third light-emitting material light to the spectral power distribution of the system light in the wavelength range of 380 nm - 780 nm is defined as fraction G, and the following applies: (a) When the system light [also] includes the second light-emitting material light, fraction G is selected from the range of 0.95*G' - 1.05*G', where G' conforms to the following formula: G' = 1.4421 - 2.904125*10 -8 *PWL - 10.08921*u' Yellow - 0.5457286*u' Red - 1.074782*10 -4 *CCT + 21.623*[u' Yellow 2 - 1.639*[u' Red 2 + 4.921703* ​​

[0008] 10 -9 *[CCT] 2 +2.316461*10 -7 *[PWL*u’ Red +7.268292*[u’ Yellow *u’ Red

[0009] +9.309924*10 -5 *[u’ Red *CCT], where the fraction G is at least 0.05 and at most 0.2; or (b) when the system light does not include the second luminescent material light, the following applies: u’ Yellow ≥0.95*(0.2546 - 0.000016*CCT), and the fraction G is at least 0.05 and at most 0.2.

[0010] With such a light generation system, high-quality light can be provided in a relatively efficient manner. Compared with known solutions, the present invention seems to provide the highest lumen efficiency in a relatively simple way. In addition, such high-quality light can be provided with a minimum number of components without the need for a complex control system. However, high-quality light can be provided within a relatively large range of correlated color temperatures. Therefore, compared with known solutions, the current solution can be basically the most efficient solution for white LEDs.

[0011] Here, in these formulas, PWL refers to the value of the peak wavelength (in nm) of the device light of the light generation device, and CCT refers to the value of the correlated color temperature (in K) of the (desired) system light. Therefore, in these equations, the x nm value of PWL will be introduced as the x value (without the nanometer unit); similarly, the y K value of CCT will be introduced as the y value (without the Kelvin unit).

[0012] As described above, the light generation system can include (i) one or more light generation devices and (ii) two or more luminescent materials. It seems that in order to obtain a large color gamut and a relatively efficient light generation system, using the proposed light generation system (which includes one or more light generation devices and (ii) two or more luminescent materials) can have certain advantages over using only primary colors (such as RGB LEDs; although such a solution can also have (other) advantages). However, the currently proposed solution seems to allow the generation of white light in a relatively efficient manner, which has a relatively high color gamut and / or improved whiteness perception.

[0013] Below, some aspects related to the light generation device and the luminescent material will be described first, and then some more specific embodiments.

[0014] ​The light generating device can be particularly configured to generate device light. In particular, the light generating device can include a light source. The light source can be particularly configured to generate source light. In an embodiment, the device light can consist essentially of the source light. In other embodiments, the device light can consist essentially of converted source light. In other embodiments, the device light can include (unconverted) source light and converted source light. The source light can be converted into luminescent material light with a luminescent material and / or into up-converted light with an up-converter (see also below). The term "light generating device" can also refer to a plurality of light generating devices that can provide device light with substantially the same spectral power distribution. In a particular embodiment, the term "light generating device" can also refer to a plurality of light generating devices that can provide device light with different spectral power distributions.

[0015] The term "light source" can in principle relate to any light source known in the art. It can be a conventional (tungsten) bulb, a low-pressure mercury lamp, a high-pressure mercury lamp, a fluorescent lamp, an LED (light emitting diode). In a particular embodiment, the light source includes a solid-state LED light source (such as an LED or a laser diode (or "diode laser")). The term "light source" can also relate to a plurality of light sources, such as 2 - 2000 (solid-state) LED light sources. Thus, the term LED can also refer to a plurality of LEDs. Furthermore, in an embodiment, the term "light source" can also refer to a so-called chip-on-board (COB) light source. The term "COB" particularly refers to an LED chip in the form of a semiconductor chip that is neither encapsulated nor connected, but is directly mounted on a substrate such as a PCB. Thus, a plurality of light-emitting semiconductor light sources can be configured on the same substrate. In an embodiment, a COB is a multi-LED chip that is configured together as a single lighting module.

[0016] The term "light source" can also refer to a chip-scale package (CSP). The CSP can include a single solid-state die, on which a layer including a light-emitting material is provided. The term "light source" can also refer to a mid-power package. The mid-power package can include one or more solid-state dies. The die(s) can be covered by a layer including a light-emitting material. The die size can be equal to or less than 2 mm, such as in the range of 0.2 nm - 2 mm. Thus, in an embodiment, the light source includes a solid-state light source. Further, in a particular embodiment, the light source includes a chip-scale packaged LED. Here, the term "light source" can also particularly refer to a small solid-state light source, such as having a mini size or a micro size. For example, the light source can include one or more of a mini LED and a micro LED. Particularly, in an embodiment, the light source includes a micro LED or "microLED" or "μLED". Here, the term mini size or mini LED particularly refers to a solid-state light source having a size (such as the die size, particularly the length and width) selected from the range of 100 μm - 1 mm. Here, the term μ size or micro LED particularly refers to a solid-state light source having a size (such as the die size, particularly the length and width) selected from the range of 100 μm and less.

[0017] The light source can have a light escape surface. For a conventional light source such as a light bulb or a fluorescent lamp, it can be the outer surface of a glass or quartz enclosure. For example, for an LED, it can be the LED die, or when resin is applied to the LED die, it can be the outer surface of the resin. In principle, it can also be the end of an optical fiber. The term escape surface particularly relates to a part of the light source, namely the place where light actually exits or escapes from the light source. The light source is configured to provide a light beam. The light beam thus escapes from the light exit surface of the light source.

[0018] Similarly, the light generating device can include a light escape surface, such as an end window. Further, similarly, the light generating system can include a light escape surface, such as an end window.

[0019] The term "light source" can refer to a semiconductor light-emitting device, such as a light-emitting diode (LED), a resonant-cavity light-emitting diode (RCLED), a vertical-cavity surface-emitting laser (VCSEL), an edge-emitting laser, etc. The term "light source" can also refer to an organic light-emitting diode (OLED), such as a passive matrix (PMOLED) or an active matrix (AMOLED). In a particular embodiment, the light source includes a solid-state light source (such as an LED or a laser diode). In one embodiment, the light source includes an LED (light-emitting diode). The term "light source" or "solid-state light source" can also refer to a superluminescent diode (SLED).

[0020] The term LED can also refer to multiple LEDs.

[0021] The term "light source" can also relate to multiple (substantially identical (or different)) light sources, such as 2 - 2000 solid-state light sources. In an embodiment, the light source can include one or more micro-optical elements (micro-lens arrays) downstream of a single solid-state light source (such as an LED) or downstream of multiple solid-state light sources (i.e., shared by multiple LEDs). In an embodiment, the light source can include an LED with on-chip optics. In an embodiment, the light source includes a pixelated single LED (with or without optics) (on-chip beam steering will be provided in an embodiment).

[0022] In an embodiment, the light source can be configured to provide primary radiation that is used as is, such as a blue light source, such as a blue LED, or a green light source, such as a green LED, and a red light source, such as a red LED. An LED that may not include a luminescent material ("phosphor") can be indicated as a direct-color LED.

[0023] However, in other embodiments, the light source can be configured to provide primary radiation, and a portion of the primary radiation is converted into secondary radiation. The secondary radiation can be based on the conversion of a luminescent material. Thus, the secondary radiation can also be indicated as luminescent material radiation. In an embodiment, the luminescent material can be included in the light source, such as an LED having a luminescent material layer or a dome including a luminescent material. Such an LED can be indicated as a phosphor-converted LED or a PC LED (phosphor-converted LED). In other embodiments, the luminescent material can be configured at a certain distance ("remote") from the light source, such as an LED having a luminescent material layer that does not physically contact the die of the LED. Thus, in a particular embodiment, the light source can be a light source that emits light having a wavelength selected from the range of 380 nm - 470 nm during operation. However, other wavelengths are also possible. Such light can be partially converted by the luminescent material.

[0024] In an embodiment, the light generation device can include a luminescent material. In an embodiment, the light generation device can include a PCLED. In other embodiments, the light generation device can include a direct LED (i.e., without a phosphor). In an embodiment, the light generation device can include a laser device, such as a laser diode. In an embodiment, the light generation device can include a superluminescent diode. Thus, in a particular embodiment, the light source can be selected from the group of laser diodes and superluminescent diodes. In other embodiments, the light source can include an LED.

[0025] The light source can be particularly configured to generate source light having an optical axis (O) (beam shape) and a spectral power distribution. In an embodiment, the source light can include one or more bands, the bandwidth of which is known for lasers.

[0026] The term "light source" can (therefore) refer to such a light generating element, such as a solid-state light source, or for example to the encapsulation of a light generating element, such as a solid-state power source, and one or more luminescent materials, including the element and (other) optical devices, such as lenses, collimators. A light conversion element ("conversion element" or "converter") can include an element containing a luminescent material. For example, a solid-state light source such as a blue LED is a light source. A combination of a solid-state light source (as a light generating element) and a light conversion element optically coupled to the solid-state light source, such as a blue LED and a light converter element, can also be a light source (but can also be indicated as a light generating device). Thus, a white LED is a light source (but can also be indicated as a (white) light generating device), for example.

[0027] The term "light source" in this document can also refer to a light source including a solid-state light source, such as an LED or a laser diode or a superluminescent diode.

[0028] Thus, in an embodiment, the term "light source" can also refer to a light source (also) based on light conversion, such as a light source combined with a luminescent conversion material. Thus, the term "light source" can also refer to a combination of an LED and a luminescent material configured to convert at least a portion of the LED radiation, or to a combination of a (diode) laser and a luminescent material configured to convert at least a portion of the (diode) laser radiation.

[0029] In an embodiment, the term "light source" can also refer to a combination of a light source (such as an LED) and a filter, which can change the spectral power distribution of the light generated by the light source. In particular, the term "light generating device" can be used to describe a light source and other (optical elements), such as a filter and / or a beam shaping element, etc.

[0030] In an embodiment, the phrase "different light sources" or "multiple different light sources" and similar phrases can refer to multiple solid-state light sources selected from at least two different intervals. Similarly, in an embodiment, the phrase "same light source" or "multiple same light sources" and similar phrases can refer to multiple solid-state light sources selected from the same interval.

[0031] The term "solid-state light source" or "solid-state material light source" and similar terms can particularly refer to semiconductor light sources, such as light emitting diodes (LEDs), diode lasers or superluminescent diodes.

[0032] Thus, each of one or more light generating devices can include one or more solid-state light sources, such as LEDs, diode lasers and superluminescent diodes.

[0033] In particular, the light generating device is configured to generate device light having a peak wavelength (PWL) selected from the wavelength range of 440 nm - 465 nm. In embodiments where two or more light generating devices are applied, the peak wavelengths of the two or more light generating devices may be within the wavelength range of 440 nm - 465 nm. The peak wavelengths may be substantially the same, or two or more peak wavelengths may be different from each other. In a particular embodiment, the device light may have a peak wavelength (PWL) selected from the wavelength range of 445 nm - 460 nm. The most efficient solutions and / or the best spectral characteristics are obtained using these values.

[0034] In particular, the light generating system includes two or more luminescent materials. The two or more luminescent materials are configured downstream of the light generating device.

[0035] In particular, in an embodiment, the system may include one or more light generating devices and a light emitting element, where the light emitting element includes a first luminescent material, an (optional) second luminescent material, and a third luminescent material, and where the light emitting element is configured downstream of the one or more light generating devices. In a particular embodiment, the light emitting element may be configured to be in contact with the one or more light generating devices. It will be clear to those skilled in the art that phrases such as "a first luminescent material, an optional second luminescent material, and a third luminescent material" may also be phrased as "a first luminescent material and a third luminescent material and an optional second luminescent material".

[0036] The terms "upstream" and "downstream" relate to the arrangement of items or features related to the propagation of light from a light generating device (here particularly a light source), where, relative to a first position within a light beam from the light generating device, a second position in the light beam closer to the light generating device is "upstream", and a third position in the light beam further away from the light generating device is "downstream".

[0037] In an embodiment, two or more luminescent materials may be included in a layer, multiple layers, or a body. The body may be a polymer body (including a silicone body) or a ceramic body. Thus, the light generating system may include a light emitting element, such as a light emitter, that includes two or more luminescent materials. The light emitting element may include multiple layers. Thus, two or more luminescent materials may be uniformly mixed (and included in a single layer or body), or may be included in different layers. The light emitting element (such as a light emitter or a light emitting (multiple) layer) may be in contact with the light generating device, or may be configured to be away from the light generating device. In particular, the light emitter or the light emitting layer may be in contact with the light generating device, such as in contact with an LED die.

[0038] In a particular embodiment, the light generating system may, for example, include a chip on board (COB) (see also above), an LED filament, or an LED package that includes a light generating device and two or more luminescent materials.

[0039] The term "luminescent material" particularly refers to a material that can convert one or more of a first radiation, particularly UV radiation and blue radiation, into a second radiation. Generally, the first radiation and the second radiation have different spectral power distributions. Thus, in addition to the term "luminescent material", the terms "luminescent converter" or "converter" can also be applied. Generally, the second radiation has a spectral power distribution at a larger wavelength than the first radiation, which is the so-called down-conversion case. However, in a particular embodiment, the spectral power distribution of the second radiation has an intensity at a smaller wavelength than the first radiation, which is the so-called up-conversion case.

[0040] In an embodiment, the "luminescent material" can particularly refer to a material that can convert radiation into, for example, visible light and / or infrared light. For example, in an embodiment, the luminescent material can be capable of converting one or more of UV radiation and blue radiation into visible light. In a particular embodiment, the luminescent material can also convert radiation into infrared radiation (IR). Thus, when excited by radiation, the luminescent material emits radiation. Generally, the luminescent material will be a down-converter, i.e., radiation of a smaller wavelength is converted into radiation of a larger wavelength (λ ex <λ em )), although in a particular embodiment, the luminescent material can include an up-converting luminescent material, i.e., radiation of a larger wavelength is converted into radiation of a smaller wavelength (λ ex >λ em ).

[0041] In an embodiment, the term "luminescence" can refer to phosphorescence. In an embodiment, the term "luminescence" can also refer to fluorescence. In addition to the term "luminescence", the term "emission" can also be used. Thus, the terms "first radiation" and "second radiation" can respectively refer to excitation radiation and emission (radiation). Similarly, in an embodiment, the term "luminescent material" can refer to phosphorescence and / or fluorescence.

[0042] The term "luminescent material" can also refer to a plurality of different luminescent materials. Examples of possible luminescent materials are given below. Thus, in a particular embodiment, the term "luminescent material" can also refer to a luminescent material composition. Instead of the term "luminescent material", the term "phosphor" can also be used. These terms are known to those skilled in the art.

[0043] In an embodiment, the luminescent material is selected from garnets and nitrides, particularly garnets and nitrides doped with trivalent cerium or divalent europium, respectively. The term "nitride" can also refer to nitroxides or nitrosilicates, etc. Alternatively or additionally, the (multiple) luminescent materials can be selected from silicates, particularly silicates doped with divalent europium.

[0044] In a particular embodiment, the luminescent material includes A3B5O12 : Ce 3+ type of luminescent material, where A includes one or more of Y, La, Gd, Tb, and Lu in the examples, particularly one or more of Y, Gd, terbium, and Lu, and where B includes one or more of Al, Ga, In, and Sc in the examples. In particular, A may include one or more of Y, Gd, and Lu, such as one or more of Y and Lu in particular. In particular, B may include one or more of Al and Ga, more particularly at least Al, such as substantially entirely Al. Thus, particularly suitable luminescent materials are cerium-containing garnet materials. Examples of garnets particularly include A3B5O 12 garnet, where A includes at least yttrium or lutetium, and where B includes at least aluminum. Such garnet may be doped with cerium (Ce), praseodymium (Pr), or a combination of cerium and praseodymium; however, it is particularly doped with Ce. In particular, B may include aluminum (Al); however, in addition to aluminum, B may also partially include gallium (Ga) and / or scandium (Sc) and / or indium (In), particularly up to about 20% of B, more particularly up to about 10% of B (i.e., the B ions are substantially composed of 90 or more mole % of Al, and one or more of Ga, Sc, and In of 10 or less mole %); B may particularly include up to about 10% of gallium. In another variant, B and O may be at least partially replaced by Si and N. Element A may particularly be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb), and lutetium (Lu). In addition, Gd and / or Tb particularly only exist in an amount up to about 20% of A. In a particular example, the garnet luminescent material includes (Y 1-x Lu x )3B5O 12 : Ce, where x is equal to or greater than 0 and equal to or less than 1. The term ":Ce" indicates that some of the metal ions in the luminescent material (i.e., some of the "A" ions in the garnet) are replaced by Ce. For example, in the case of (Y 1-x Lu x )3Al5O 12 : Ce, some of Y and / or Lu are replaced by Ce. This is known to those skilled in the art. Ce generally replaces no more than 10% of A; generally, the Ce concentration will be in the range of 0.1% to 4%, particularly 0.1% to 2% (relative to A). Assuming 1% of Ce and 10% of Y, the completely correct chemical formula may be (Y 0.1 Lu 0.89 Ce 0.01 )3Al5O 12 . The Ce in the garnet is substantially or only in the trivalent state, as known to those skilled in the art.

[0045] In an embodiment, the luminescent material thus comprises A3B5O 12 , where in a particular embodiment up to 10% of the B-O can be replaced by Si-N.

[0046] In a particular embodiment, the luminescent material comprises (Y x1 A’ x2 Ce x3 )3(Al y1 B’ y2 )5O 12 , where x1 + x2 + x3 = 1, where x3 > 0, where 0 < x2 + x3 ≤ 0.2, where y1 + y2 = 1, where in particular, 0 ≤ y2 ≤ 0.2, where A’ comprises one or more elements selected from the group consisting of lanthanide elements, and where B’ comprises one or more elements selected from the group consisting of Ga, In, and Sc. In an embodiment, x3 is selected from the range of 0.001 - 0.1. In the present invention, in particular, x1 > 0, such as > 0.2, e.g., at least 0.8. Garnets with Y can provide a suitable spectral power distribution.

[0047] In a particular embodiment, up to 10% of the B-O can be replaced by Si-N. Here, B in B-O refers to one or more of Al, Ga, In, and Sc (and O refers to oxygen); in a particular embodiment, B-O can refer to Al-O. As mentioned above, in a particular embodiment, x3 can be selected from the range of 0.001 to 0.04. In particular, such a luminescent material can have a suitable spectral distribution (see below), have a relatively high efficiency, have a relatively high thermal stability, and allow for a high CRI (optionally in combination with the light of other light sources described herein). Thus, in a particular embodiment, A can be selected from the group consisting of Lu and Gd. Alternatively or additionally, B can include Ga. Thus, in an embodiment, the luminescent material comprises (Y x1 (Lu,Gd) x2 Ce x3 )3(Al y1 Ga y2 )5O 12 , where Lu and / or Gd are available. More specifically, x3 is selected from the range of 0.001 - 0.1, where 0 < x2 + x3 ≤ 0.1, and where 0 ≤ y2 ≤ 0.1. Further, in a particular embodiment, up to 1% of the B-O can be replaced by Si-N. Here, the percentage refers to the number of moles (as known in the art); see, for example, EP3149108. In another particular embodiment, the luminescent material comprises (Y x1 Ce x3 )3Al5O 12 , where x1 + x3 =?1, and where 0 < x3 ≤ 0.2, such as 0.001 - 0.1.

[0048] In certain embodiments, the light generating device may include only a luminescent material selected from the cerium-containing garnet type. In another particular embodiment, the light generating device includes a single type of luminescent material, such as (Y x1 A’ x2 Ce x3 )3(Al y1 B’ y2 )5O 12 . Thus, in certain embodiments, the light generating device includes a luminescent material, wherein at least 85 wt%, even more particularly at least about 90 wt%, such as even more particularly at least about 95 wt% of the luminescent material comprises (Y x1 A’ x2 Ce x3 )3(Al y1 B’ y2 )5O 12 . Here, wherein A’ comprises one or more elements selected from the group consisting of lanthanide elements, and wherein B’ comprises one or more elements selected from Ga, In, and Sc, where x1 + x2 + x3 = 1, where x3 > 0, where 0 < x2 + x3 ≤ 0.2, where y1 + y2 = 1, where 0 ≤ y2 ≤ 0.2. In particular, x3 is selected from the range of 0.001 - 0.1. Note that in an embodiment, x2 = 0. Alternatively or additionally, in an embodiment, y2 = 0.

[0049] In certain embodiments, A may particularly include at least Y, and B may particularly include at least Al.

[0050] Alternatively or additionally, wherein the luminescent material may include a luminescent material of the A3Si6N 11 :Ce 3+ type, wherein A includes one or more of Y, La, Gd, Tb, and Lu, such as in an embodiment, including one or more of La and Y.

[0051] In an embodiment, the luminescent material may alternatively or additionally include MS:Eu 2+ and / or M2Si5N8:Eu 2+ and / or MAlSiN3:Eu 2+ and / or Ca2AlSi3O2N5:Eu 2+one or more of the like, wherein M includes one or more of Ba, Sr, and Ca. In particular, in embodiments, it includes at least Sr. Thus, in embodiments, the luminescent body may include one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu, and (Ba,Sr,Ca)2Si5N8:Eu. In these compounds, europium (Eu) is substantially or only divalent and replaces one or more of the indicated divalent cations. Generally, the content of Eu does not exceed 10% of the cations; relative to the (multiple) cations it replaces, its presence will particularly be in the range of about 0.5% to 10%, more particularly in the range of about 0.5% to 5%. The term ":Eu" indicates that part of the metal ions are replaced by Eu (Eu in these examples). 2+ ). For example, assuming 2% Eu in CaAlSiN3:Eu, the correct chemical formula may be (Ca 0.98 Eu 0.02 )AlSiN3. Divalent europium typically replaces divalent cations, such as the above divalent alkaline earth cations, particularly Ca, Sr, or Ba. The material (Ba,Sr,Ca)S:Eu may also be indicated as MS:Eu, where M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes calcium, or strontium, or calcium and strontium in this compound, more particularly calcium. Here, Eu is introduced and replaces at least a part of M (i.e., one or more of Ba, Sr, and Ca). In addition, the material (Ba,Sr,Ca)2Si5N8:Eu may also be indicated as M2Si5N8:Eu, where M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes Sr and / or Ba in this compound. In another specific embodiment, M consists of Sr and / or Ba (regardless of the presence of Eu), particularly 50% to 100%, more particularly 50% to 90% of Ba, and 50% to 0%, particularly 50% to 10% of Sr, such as Ba 1.5 Sr 0.5Si5N8:Eu (i.e., 75% Ba; 25% Sr). Here, Eu is introduced and replaces at least a portion of M, i.e., one or more of Ba, Sr, and Ca. Similarly, the material (Ba,Sr,Ca)AlSiN3:Eu can also be denoted as MAlSiN3:Eu, where M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes calcium, or strontium, or calcium and strontium in this compound, and more particularly calcium. Here, Eu is introduced and replaces at least a portion of M (i.e., one or more of Ba, Sr, and Ca). As is known to those skilled in the art, Eu in the above luminescent materials is substantially or only in the divalent state.

[0052] In an embodiment, the red luminescent material can include one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu, and (Ba,Sr,Ca)2Si5N8:Eu. In these compounds, europium (Eu) is substantially or only divalent and replaces one or more of the indicated divalent cations. Generally, the content of Eu does not exceed 10% of the cations; relative to the cation(s) it replaces, its presence will particularly be in the range of about 0.5% to 10%, and more particularly in the range of about 0.5% to 5%. The term ":Eu" indicates that a portion of the metal ions are replaced by Eu (Eu in these examples). 2+ ) For example, assuming 2% Eu in CaAlSiN3:Eu, the correct chemical formula can be (Ca 0.98 Eu 0.02 )AlSiN3. Divalent europium usually replaces divalent cations, such as the above divalent alkaline earth cations, particularly Ca, Sr, or Ba.

[0053] The material (Ba,Sr,Ca)S:Eu can also be denoted as MS:Eu, where M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes calcium or strontium, or calcium and strontium in this compound, and more particularly calcium. Here, Eu is introduced and replaces at least a portion of M (i.e., one or more of Ba, Sr, and Ca).

[0054] In addition, the material (Ba,Sr,Ca)2Si5N8:Eu can also be denoted as M2Si5N8:Eu, where M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes Sr and / or Ba in this compound. In another specific embodiment, M consists of Sr and / or Ba (regardless of the presence of Eu), particularly 50% to 100%, more particularly 50% to 90%, of Ba, and 50% to 0%, particularly 50% to 10%, of Sr, such as Ba 1.5 Sr 0.5 Si5N8:Eu (i.e., 75% Ba; 25% Sr). Here, Eu is introduced and replaces at least a part of M, i.e., one or more of Ba, Sr, and Ca.

[0055] Similarly, the material (Ba,Sr,Ca)AlSiN3:Eu can also be denoted as MAlSiN3:Eu, where M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes calcium or strontium, or calcium and strontium, more particularly calcium, in this compound. Here, Eu is introduced and replaces at least a part (i.e., one or more of Ba, Sr, and Ca) of M.

[0056] As is known to those skilled in the art, Eu in the above-mentioned luminescent materials is substantially or only in the divalent state.

[0057] The blue luminescent material can include YSO (Y2SiO5:Ce 3+ ) or a similar compound, or BAM (BaMgAl 10 O 17 :Eu 2+ ) or a similar compound.

[0058] The term "luminescent material" herein particularly relates to inorganic luminescent materials.

[0059] Alternatively or additionally, other luminescent materials can also be applied. For example, quantum dots and / or organic dyes can be applied, and they can optionally be embedded in a transmissive matrix, such as a polymer, such as PMMA, or polysiloxane, etc.

[0060] Quantum dots are small crystals of semiconductor materials, typically only a few nanometers in width or diameter. When excited by incident light, the color of the light emitted by the quantum dots is determined by the size of the crystal and the material. Therefore, by adjusting the size of the dots, light of a specific color can be produced. Most known quantum dots that emit in the visible light range are based on cadmium selenide (CdSe), which has a shell such as cadmium sulfide (CdS) and zinc sulfide (ZnS). Cadmium-free quantum dots such as indium phosphide (InP), copper indium sulfide (CuInS2), and / or silver indium sulfide (AgInS2) can also be used. Quantum dots exhibit a very narrow emission band, and thus they exhibit saturated colors. In addition, by adjusting the size of the quantum dots, the emission color can be easily adjusted. Any type of quantum dots known in the art can be used in the present invention. However, for environmental safety and concern reasons, cadmium-free quantum dots or at least quantum dots with a very low cadmium content are preferably used.

[0061] Instead of or in addition to quantum dots, other quantum confinement structures can be used. In the context of the present application, the term "quantum confinement structure" should be understood as, for example, quantum wells, quantum dots, quantum rods, tripods, tetrapods, or nanowires, etc.

[0062] Organic phosphors can also be used. Examples of suitable organic phosphor materials are organic light-emitting materials based on perylene derivatives, such as the compounds sold by BASF under the name. Examples of suitable compounds include, but are not limited to Red F305, Orange F240, Yellow F083, and F170.

[0063] Different luminescent materials can have different spectral power distributions of the light of the corresponding luminescent materials. Alternatively or additionally, such different luminescent materials can particularly have different color points (or dominant wavelengths).

[0064] As described above, other luminescent materials are also possible. Thus, in a specific embodiment, the luminescent material is selected from the group consisting of europium(II)-containing nitrides, europium(II)-containing oxynitrides, europium(II)-containing silicates, cerium-containing garnets, and quantum structures. Quantum structures can, for example, include quantum dots or quantum rods (or other quantum-type particles) (see above). Quantum structures can also include quantum wells. Quantum structures can also include photonic crystals.

[0065] In particular, two or more luminescent materials include (i) a first luminescent material and a third luminescent material. Optionally, two or more luminescent materials may further include a second luminescent material. The terms "first luminescent material", "second luminescent material", and "third luminescent material" may refer to luminescent materials that meet the corresponding conditions. Thus, in an embodiment, the term "first luminescent material" may refer to one or more first luminescent materials, and in a particular embodiment, may refer to a substantially single type of first luminescent material. Similarly, in an embodiment, the term "second luminescent material" may refer to one or more second luminescent materials, and in a particular embodiment, may refer to a substantially single type of second luminescent material. Similarly, in an embodiment, the term "third luminescent material" may refer to one or more third luminescent materials, and in a particular embodiment, may refer to a substantially single type of third luminescent material.

[0066] In particular, the first luminescent material may be configured to convert at least a portion of the device light into first luminescent material light having spectral power in the green-yellow wavelength range.

[0067] The phrase "in the green-yellow wavelength range" and similar phrases may indicate the presence of spectral intensity in the green wavelength range, such as an emission band or line only in the green wavelength range, or the presence of spectral intensity in the yellow wavelength range, such as an emission band or line only in the yellow wavelength range, or the presence of spectral intensity in both the green wavelength range and the yellow wavelength range, such as the following emission band (or line): at least a portion of its spectral intensity is in the green wavelength range, and at least a portion of its spectral intensity is in the yellow wavelength range. Similarly, this may apply to other ranges including multiple colors mentioned herein (e.g., the orange-red wavelength range). Additionally, in a particular embodiment, the phrase "in the green-yellow wavelength range" and similar phrases may indicate that the luminescent material light may have a centroid wavelength in the green-yellow wavelength range. However, this is not necessarily the case, and luminescent materials that provide spectral power both within and outside the indicated wavelength range may also be applied. This particularly applies to the second luminescent material light.

[0068] The terms "blue light" or "blue emission" and similar terms can specifically refer to light having wavelengths in the range of about 440 nm - 490 nm (including some purple and cyan hues). In certain embodiments, the blue light can have a centroid wavelength within the range of 440 nm - 490 nm. The terms "green light" or "green emission" and similar terms can specifically refer to light having wavelengths in the range of about 490 nm - 560 nm. In certain embodiments, the green light can have a centroid wavelength within the range of 490 nm - 560 nm. The terms "yellow light" or "yellow emission" and similar terms can specifically refer to light having wavelengths in the range of about 560 nm - 590 nm. In certain embodiments, the yellow light can have a centroid wavelength within the range of 560 nm - 590 nm. The terms "orange light" or "orange emission" and similar terms can specifically refer to light having wavelengths in the range of about 590 nm - 620 nm. In certain embodiments, the orange light can have a centroid wavelength within the range of 590 nm - 620 nm. The terms "red light" or "red emission" and similar terms can specifically refer to light having wavelengths in the range of about 620 nm - 750 nm. In certain embodiments, the red light can have a centroid wavelength within the range of 620 nm - 750 nm. The terms "cyan light" or "cyan emission" and similar terms can specifically refer to light having wavelengths in the range of about 490 nm - 520 nm. In certain embodiments, the cyan light can have a centroid wavelength within the range of 490 nm - 520 nm. The terms "amber light" or "amber emission" and similar terms can specifically refer to light having wavelengths in the range of about 585 nm - 605 nm, such as about 590 nm - 600 nm. In certain embodiments, the amber light can have a centroid wavelength within the range of 585 nm - 605 nm. The phrase "light having one or more wavelengths within a wavelength range" and similar phrases can specifically indicate that the indicated light (or radiation) has a spectral power distribution that has intensity at least at these one or more wavelengths within the indicated wavelength range. For example, a solid-state light source that emits blue light will have a spectral power distribution that has intensity at one or more wavelengths within the 440 nm - 495 nm wavelength range. The terms "violet light" or "violet emission" and similar terms can specifically refer to light having wavelengths in the range of about 380 nm - 440 nm. In certain embodiments, the violet light can have a centroid wavelength within the range of 380 nm - 440 nm.

[0069] The term "centroid wavelength" (also denoted as λc) is known in the art and refers to the wavelength value at which half of the light energy is at shorter wavelengths and half of the energy is at longer wavelengths; this value is expressed in nanometers (nm). It is the wavelength that divides the integral of the spectral power distribution into two equal parts, as represented by the formula λc = Σλ * I(λ) / (ΣI(λ)), where the sum is over the wavelength range of interest and I(λ) is the spectral energy density (i.e., the integral of the product of wavelength and intensity over the emission band, normalized to the integral intensity). The centroid wavelength can be determined, for example, under operating conditions.

[0070] Thus, the term "green-yellow wavelength range" can particularly refer to the wavelength range of 490 nm - 590 nm. Additionally, the first luminescent material light can have a full width at half maximum of at least 40 nm, more particularly at least 50 nm. Additionally, the first luminescent material light can have chromaticity coordinates u’ yellow , v’ yellow . Thus, the first luminescent material can particularly be a broadband emitter. In particular, the first luminescent material can have a centroid wavelength within the green-yellow wavelength range. In particular, in an embodiment, the first luminescent material light can have a centroid wavelength within the green-yellow wavelength range.

[0071] The chromaticity coordinates represented by u’ and v’ particularly refer to the CIE 1976 chromaticity coordinates (see ISO CIE 11664-5: Colorimetry - Part 5: CIE 1976 L*u*v* color space and u', v' uniform chromaticity scale diagram).

[0072] In particular, the optional second luminescent material can be configured to convert at least a portion of the device light into second luminescent material light having spectral power within the orange-red wavelength range. The term "orange-red wavelength range" can particularly refer to the wavelength range of 590 nm - 780 nm. Additionally, the second luminescent material light can have a full width at half maximum of at least 40 nm, more particularly at least 50 nm. However, the second luminescent material light can have chromaticity coordinates u’ red , v’ red . Thus, the second luminescent material can particularly be a broadband emitter. In particular, the second luminescent material can have a centroid wavelength within the orange-red wavelength range, more particularly within the wavelength range of 590 nm - 680 nm. In particular, in an embodiment, the second luminescent material light can have a centroid wavelength within the orange-red wavelength range, although this is not necessarily the case. However, a second luminescent material having substantial intensity within the yellow wavelength range can also be applied when it of course also has spectral power within the orange and / or red wavelength ranges.

[0073] In particular, the third luminescent material may be configured to convert at least a portion of the device light into third luminescent material light within the orange-red wavelength range. In particular, in an embodiment, the third luminescent material light may have a centroid wavelength within the orange-red wavelength range. In an embodiment, the centroid wavelength of the second luminescent material light (if available) is less than the centroid wavelength of the third luminescent material light. For example, the difference may be at least about 10 nm, more particularly at least about 20 nm, for example selected from the range of 20 nm - 100 nm.

[0074] In an embodiment, the third luminescent material comprises M' doped with tetravalent manganese x M 2-2x AX6, where M' comprises an alkaline earth cation, where M comprises a cation, x is in the range of 0 - 1, where A comprises a tetravalent cation, where X comprises a monovalent anion, at least including fluorine. In particular, the third luminescent material may be a narrowband emitter or a line emitter. Tetravalent manganese may emit within the orange-red wavelength range, having an emission line at room temperature with a full width at half maximum less than 50 nm, even less than 40 nm, known for Mn 4+ Forbidden 2 E g → 4 A 2g Conversion.

[0075] M' doped with tetravalent manganese x M 2-2x A luminescent material of the M'

[0076] Here, M' doped with tetravalent manganese x M 2-2x AX6 may also be abbreviated as "phosphor", that is, in one embodiment, the phrase "comprising a phosphor of M' doped with tetravalent manganese x M 2-2x AX6" may also be understood as a phosphor of M' doped with tetravalent manganese x M 2-2x AX6 phosphor, or a (tetravalent) manganese-doped M' x M 2-2x AX6 phosphor, or simply abbreviated as "phosphor".

[0077] The relevant alkaline cations (M) are sodium (Na), potassium (K), and rubidium (Rb). Optionally, lithium (Li) and / or cesium (Cs) may also be applied. In a preferred embodiment, M comprises at least potassium. In another embodiment, M comprises at least rubidium. The phrase "where M comprises at least potassium" indicates, for example, in molar M' x M 2-2xAmong all the M cations in AX6, a part includes K + , and optionally the remaining part includes one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M includes at least potassium and rubidium. Optionally, M’ x M 2-2x The AX6 luminescent material has a hexagonal phase. In another embodiment, M’ x M 2-2x The AX6 luminescent material has a cubic phase.

[0078] The relevant alkaline earth metal cations (M’) are magnesium (Mg), strontium (Sr), calcium (Ca), and barium (Ba), particularly one or more of Sr and Ba.

[0079] In one embodiment, combinations of different alkaline cations can be applied. In another embodiment, combinations of different alkaline earth metal cations can be applied. In another embodiment, combinations of one or more alkaline cations and one or more alkaline earth metal cations can be applied. For example, KRb 0.5 Sr 0.25 AX6. As described above, x can be in the range of 0 - 1, particularly x < 1. In one embodiment, x = 0.

[0080] The term "tetravalent manganese" refers to Mn 4+ . This is a well-known luminescent ion. In the above chemical formula, a part of the tetravalent cation A (such as Si) is replaced by manganese. Therefore, the M’ x M 2-2x AX6 doped with tetravalent manganese can also be denoted as M’ x M 2-2x A 1-m Mn m X6. The molar percentage of manganese (i.e., the percentage by which it replaces the tetravalent cation A) is generally in the range of 0.1% - 15%, particularly 1% - 12%, that is, m is in the range of 0.001 - 0.15, particularly in the range of 0.01 - 0.12.

[0081] A includes tetravalent cations and preferably at least includes silicon. A can optionally (further) include one or more of titanium (Ti), germanium (Ge), tin (Sn), and zinc (Zn). Preferably, at least 80%, even more preferably at least 90%, such as at least 95% of M is composed of silicon. Therefore, in a specific embodiment, M’ x M 2-2x AX6 can also be described as M’ x M 2-2x A 1-m-t-g-s- zr Mn m Tit Ge g Sn s Zr zr X6, where m and x are as described above, and where each of t, g, s, zr is preferably in the range of 0 - 0.2, particularly 0 - 0.1, even more particularly 0 - 0.05, where t + g + s + zr is less than 1, particularly equal to or less than 0.2, preferably in the range of 0 to 0.2, particularly in the range of 0 - 0.01, even more particularly in the range of 0 - 0.025, and where A is particularly Si. X is preferably fluorine (F).

[0082] As described above, M relates to monovalent cations, but preferably comprises at least potassium and / or rubidium. Other monovalent cations that M can also include can be selected from the group consisting of lithium (Li), sodium (Na), cesium (Cs), and ammonium (NH4 + )). In one embodiment, preferably at least 80% (i.e., 80% of all moles of the M type), even more preferably at least 90%, such as 95%, of M consists of potassium and / or rubidium. Particularly, in these embodiments, x is thus zero.

[0083] Thus, in a particular embodiment, M’ x M 2-2x AX6 can also be described as (K 1-r-l-n-c-nh Rb r Li l Na n Cs c (NH4) nh )2AX6, where r is in the range of 0 - 1, where each of l, n, c, nh is preferably in the range of 0 - 1, preferably 0 - 0.2, particularly 0 - 0.1, even more particularly 0 - 0.05, and where r + n + c + nh is in the range of 0 - 1, particularly, l + n + c + nh is less than 1, particularly, equal to or less than 0.2, preferably in the range of 0 - 0.2, particularly in the range of 0 - 0.1, even more particularly in the range of 0 - 0.05. X is preferably fluorine (F).

[0084] As described above, instead of or in addition to the (multiple) alkaline cations, one or more alkaline earth metal cations can also be present. Thus, in a particular embodiment, M’ x M 2-2x AX6 can also be described as Mg mg Ca ca Sr sr Ba ba (K k Rb r Li l Na n Csc (NH4) nh )2AX6, where k, r, l, n, c, nh are each individually in the range of 0 - 1, where mg, ca, sr, ba are each individually in the range of 0 - 1, and where mg + ca + sr + ba + k + r + l + n + c + nh = 1. In an embodiment, k = 1, and the others (mg, ca, sr, ba, r, l, n, c, nh) are zero.

[0085] As described above, X relates to a monovalent anion, but at least includes 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. Thus, in a particular embodiment, M’ x M 2-2x AX6 can also be described as M’ x M 2-2x A(F 1-cl-b-i Cl cl Br b I i )6, where cl, b, i are each individually preferably in the range of 0 - 0.2, particularly in the range of 0 - 0.1, even more particularly in the range of 0 - 0.05, and where cl + b + i is less than 1, particularly equal to or less than 0.2, preferably in the range of 0 - 0.02, particularly in the range of 0 - 0.1, even more particularly in the range of 0 - 0.05. Particularly, X consists essentially of F (fluorine).

[0086] Therefore, M’ x M 2-2x AX6 can also be described as (K 1-r-l-n-c-nh Rb r Li l Na n Cs c (NH4) nh )2Si 1-m-t-g-s- zr Mn m Ti t Ge g Sn s Zr zr (F 1-cl-b-i Cl cl Br b I i )6, where the values of r, l, n, c, nh, m, t, g, s, zr, cl, b, i are as described above. X is preferably fluorine (F).

[0087] More specifically, M’ x M2-2x AX6 can also be described as Mg mg Ca ca Sr sr Ba ba (K k Rb r Li l Na n Cs c (NH4) nh )2Si 1-m-t-g-s-zr Mn m Ti t Ge g Sn s Zr zr (F 1-cl-b-i Cl cl Br b I i )6, where k, r, l, n, c, nh are each individually in the range of 0 - 1, where mg, ca, sr, ba are each individually in the range of 0 - 1, where mg + ca + sr + ba + k + r + l + n + c + nh = 1, and the values of m, t, g, s, zr, cl, b, i are as described above. X is preferably fluorine (F).

[0088] In one embodiment, M' x M 2-2x AX6 includes K2SiF6 (also referred to herein as the KSiF system). As described above, in another preferred embodiment, M' x M 2-2x AX6 includes KRbSiF6 (i.e., r = 0.5, and l, n, c, nh, t, g, s, zr, cl, b, i are 0) (also referred to herein as the K, Rb system). As described above, part of the silicon is replaced by manganese (i.e., the chemical formula can also be described as K2Si 1-m Mn m F6 or KRbSi 1-m Mn m F6, where m is as shown above, or described separately as KRbSiF6:Mn and K2SiF6:Mn). Since manganese replaces a part of the host lattice ions and has a specific function, it is also called a "dopant" or "activator". Therefore, the hexafluorosilicate is doped or activated with manganese (Mn 4+ ).

[0089] In a specific embodiment, the luminescent material may include (K,Rb)2SiF6:Mn 4+ . Alternatively or additionally, in an embodiment, the third luminescent material may include K2SiF6:Mn 4+Alternatively or additionally, in an embodiment, the third luminescent material may include K2TiF6:Mn 4+ In an embodiment, the third luminescent material may include K2(Si,Ti)F6:Mn 4+ As described above, "Si, Ti" may indicate one or more of Si and Ti.

[0090] The luminescent material may also be coated as described in WO2013121355A1.

[0091] In an embodiment, the third luminescent material may have a color point in the range selected from 0.52 ≤ u’ ≤ 0.54 and 0.50 ≤ v’ ≤ 0.53 (such as 0.51 ≤ v’ ≤ 0.53).

[0092] Here, it is indicated that the first luminescent material and / or the second luminescent material and / or the third luminescent material are configured to convert at least a part of the device light. It is not excluded here that one or more of these luminescent materials may also absorb a part of the luminescent material light of one or more other luminescent materials among these luminescent materials.

[0093] The light generation system is configured to generate system light. In an embodiment, in the operating mode, the system light may include (i) at least a part of the device light, (ii) at least a part of the first luminescent material light, and (iii) at least a part of the third luminescent material light. Other combinations are also possible, especially when two or more light generation devices are applied, and / or when (also) applying a light generation device different from the light generation device. However, in particular, in an embodiment, the light generation system is configured to generate system light that includes (i) at least a part of the device light, (ii) at least a part of the first luminescent material light, and (iii) at least a part of the third luminescent material light.

[0094] In an embodiment, the system may be configured such that the system light may have one or more of the following: (i) an R value of at least 85 f value, (ii) an R f,h1 value, (iii) an R value of at least 95 g value, and (iv) an R cs,h1 value of at least -1%.

[0095] In particular, two or more luminescent materials and light generation devices (and optional other light generation devices) may be (configured and) selected such that the system light may be of high quality and may meet the conditions of P1F3 or higher. The P1F3 conditions are described in the TM-30(2020) standard ANSI / IES TM-30-20: IES Light Source Color Reproduction Evaluation Method, and may involve R f 、Rf,h1 , R g and R cs,h1 . Here, R f may refer to the fidelity (average color difference of the object under the reference and test sources), R f,h1 may refer to the fidelity of hue interval 1 (red), R g may refer to the gamut index (color saturation), R cs,h1 may refer to the color saturation of hue interval 1. Additionally, in particular, the system light may have a correlated color temperature (CCT) selected from the range of 1800K - 6500K. Thus, in an embodiment, the system may be configured such that the system light is white light having a correlated color temperature (CCTV) selected from the range of 1800K - 6500k, at least 85 of the R f value, at least 85 of the R f,h1 value, at least 95 of the R g value, at least -1% of the R cs,h1 value, where R f , R f,h1 , R g and R cs,h1 are defined according to the method of ANSI / IES TM - 30 - 20:IES for evaluating the color rendering of light sources in accordance with the TM - 30(2020) standard. In particular, the correlated color temperature (CCT) may be selected from the range of 2700K - 6500K. Thus, in an embodiment, the light - generating device and two or more luminescent materials are selected and configured such that the system light is white light having a correlated color temperature (CCTV) selected from the range of 1800K - 6500K and having one or more, and in particular all, of the following: at least 85 of the R f value, at least 85 of the R f,h1 value, at least 95 of the R g value, and at least -1% of the R cs,h1 value.

[0096] When the light - generating device and two or more luminescent materials as defined herein are selected, the system light may seemingly have these characteristics. More specifically, when certain conditions apply to the contribution of the third luminescent material light to the spectral power distribution of the system light, the system light may have these characteristics. Here, two embodiments can be distinguished: (a) two or more luminescent materials include the second luminescent material, and thus the system light may include the second luminescent material light, or (b) two or more luminescent materials do not include the second luminescent material, and thus the system light does not include the second luminescent material light. The contribution of the third luminescent material light to the spectral power distribution of the system light in the wavelength range of 380nm - 780nm is defined herein as the fraction G.

[0097] In an embodiment, the following items may apply: (a) When the system light also includes the second luminescent material light, the fraction G is selected from the range of a'*G' - a"*G', where G' conforms to the following formula: G' = 1.4421 - 2.904125*10 -8 *PWL - 10.08921*u' Yellow -0.5457286*u' Red -1.074782*10 -4 *CCT + 21.623*[u' Yellow 2 -1.639*[u' Red 2 +4.921703*10 -9 *[CCT] 2 +2.316461*10 -7 *[PWL*u' Red +7.268292*[u' Yellow *u' Red +9.309924*10 -5 *[u' Red *CCT], where a' = 0.95 and a" = 1.05, and where the fraction G is at least 0.05 and at most 0.2; or (b) When the system light does not include the second luminescent material light, the following item applies: u' Yellow ≥ a"'*(0.2546 - 0.000016*CCT), where a"' = 0.95, and the fraction G is at least 0.05 and at most 0.2. Note that regardless of whether the second luminescent material light is included in the system light, the contribution of the third luminescent material light to the spectral power distribution in the wavelength range of 380 nm - 780 nm can be particularly selected from the range of 0.05 - 0.2. The parameters a', a" and a"' in the formula allow some freedom. The closer these parameters are to 1, the better the result. In a particular embodiment, G can be selected from the range of 0.97*G' - 1.03*G' or u' Yellow ≥ 0.97*(0.2546 - 0.000016*CCT) (i.e., a' and a"' are 0.97, and a" is 1.03). More specifically, G can be selected from the range of 0.98*G' - 1.02*G' or u' Yellow ≥ 0.98*(0.2546 - 0.000016*CCT) (i.e., a' and a"' are 0.98, and a" is 1.02). However, more particularly, G can be selected from the range of 0.99*G' - 1.01*G' or u' Yellow ​​≥0.99*(0.2546-0.000016*CCT) (ie, a' and a'' are 0.99, and a'' is 1.01). Therefore, in the embodiment, G=G' or u' Yellow ≥(0.2546-0.000016*CCT) (ie, a', a", and a'" are 1). In a particular embodiment, the fraction G is at least 0.1 (and thus at most 0.2). In particular, in this way, P1F3 or even higher conditions can be met while maintaining relatively high efficiency.

[0098] In particular, the first luminescent material may include a garnet luminescent material, as described above. The first luminescent material may provide a substantial spectral power in the green-yellow wavelength range in an efficient manner. In an embodiment, the first luminescent material may include A3B5O 12 : Ce type luminescent material, 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. Such luminescent materials are relatively broadband emitters, such as having a half-maximum full width of at least about 40 nm, more particularly at least about 50 nm. In particular, A may comprise one or more of Y, Gd and Lu. In addition, B may particularly comprise Al, and optionally Ga. In a particular embodiment, the first luminescent material comprises Lu3B5O 12 :Ce 3+ 、Y3Al5O 12 :Ce 3+ 、Y3(Al,Ga)5O 12 :Ce 3+ and (Gd,Y)3B5O 12 : Ce (see also below), in particular, the first luminescent material may include Lu3Al5O 12 :Ce 3+ 、Y3Al5O 12 :Ce 3+ 、Y3(Al,Ga)5O 12 :Ce 3+ and (Gd,Y)3Al5O 12 : One or more of Ce.

[0099] Referring to the third luminescent material, as described above, in particular, when doped with M' x M 2-2x In an embodiment of AX6, x=0, M includes one or more of K and Rb, and wherein X=F. Furthermore, A may specifically include Si (silicon).

[0100] In the absence of a second luminescent material, a particularly high CCT can be obtained, such as at least about 3800 K, such as at least about 4000 K. Thus, in embodiments, the system light does not include second luminescent material light, and the associated color temperature can be selected from the range of 4000 K - 6500 K.

[0101] When the second luminescent material is absent, it may be necessary to apply a first luminescent material, which can be relatively redshifted compared to the first luminescent material that can be used in combination with the second luminescent material. Thus, in embodiments, the first luminescent material can be garnet-type, but can particularly include a relatively high Gd content and / or a relatively low Ga content and / or a relatively low Lu content. Thus, in embodiments, A in A3B5O 12 :Ce includes Gd and / or less than 10% Lu and / or where A in A3B5O 12 :Ce includes less than 10% Ga. Additionally, as described above, in these embodiments, a higher CCT can also be selected, such as at least 3800 K. In particular, in (such) embodiments, the first luminescent material light can have a color point (u’ yellow , v’ yellow ) selected from the range of 0.15 ≤ u’ ≤ 0.200 and 0.555 ≤ v’ ≤ 0.575.

[0102] In certain embodiments, two or more luminescent materials consist of a first luminescent material and a third luminescent material. Thus, in these embodiments, there is essentially no contribution to the spectral power distribution that is greater than the contribution of the first luminescent material and the third luminescent material (and of course the device light).

[0103] In other embodiments, a second luminescent material is present, and the contribution in the spectral power distribution of the second luminescent material light in the system light (in the operating mode) is available. In particular, in such embodiments, the second luminescent material can include a nitride containing divalent europium. The second luminescent material can provide a significant spectral power in the orange-red wavelength range (and optionally in one or more other wavelength ranges) in an efficient manner. This divalent europium-containing nitride luminescent material is a relatively broadband emitter, such as having an FWHM of at least about 40 nm, more particularly at least about 50 nm. Thus, in embodiments, the system light can include second luminescent material light; where the second luminescent material can particularly include one or more of M2Si5N8:Eu 2+ , MAlSiN3:Eu 2+ and M2AlSi3O2N5:Eu 2+ , where M includes one or more of Ba, Sr, and Ca. In particular, in embodiments, the second luminescent material can include MAlSiN3:Eu 2+; wherein M comprises at least Sr and Ca. For example, at least 90% of M can be composed of Sr and / or Ca. In an embodiment, the second luminescent material may have a color point (u’ red , v’ red ) within the range selected from 0.33 ≤ u’ ≤ 0.48 and 0.525 ≤ v’ ≤ 0.550.

[0104] In particular, in embodiments where two or more luminescent materials include a first luminescent material, a second luminescent material, and a third luminescent material, one or more of the following may be applied: (a) The first luminescent material has a color point (u’ yellow , v’ yellow ) within the range selected from 0.135 ≤ u’ ≤ 0.200 and 0.555 ≤ v’ ≤ 0.575; (b) The second luminescent material has a color point (u’ red , v’ red ) within the range selected from 0.33 ≤ u’ ≤ 0.48 and 0.525 ≤ v’ ≤ 0.550; and (c) The third luminescent material has a color point within the range (specifically 0.51 ≤ v’ ≤ 0.53) selected from 0.52 ≤ u’ ≤ 0.54 and 0.50 ≤ v’ ≤ 0.53. The latter color point (i.e., the color point of the third luminescent material) can generally be applicable (since its color point is relatively independent of the composition of the third luminescent material), and thus is also applicable to embodiments that do not include the second luminescent material.

[0105] In a specific embodiment, two or more luminescent materials are composed of a first luminescent material, a second luminescent material, and a third luminescent material. Thus, in such an embodiment, there is essentially no contribution greater than the contributions of the first luminescent material, the second luminescent material, and the third luminescent material to the spectral power distribution.

[0106] In an embodiment, the spectral power distribution of the system light has the following contributions, as shown in Table 1.

[0107] Table 1

[0108]

[0109]

[0110] The contributions should be selected from the indicated ranges to obtain a total of 100%.

[0111] In a further embodiment, the spectral power distribution of the system light has the following contributions, as shown in Table 2.

[0112] Table 2

[0113]

[0114]

[0115] The contributions should be selected from the indicated range to obtain a total of 100%.

[0116] According to another aspect, the present invention provides a light generation system, which includes a light generation device and two or more kinds of luminescent materials, wherein:

[0117] - The light generation device is configured to generate device light having a peak wavelength in a wavelength range selected from 440 nm - 465 nm; wherein the light generation device includes a solid-state light source;

[0118] - The two or more kinds of luminescent materials include (i) a first luminescent material, which is configured to convert at least a part of the device light into first luminescent material light, and the first luminescent material light has spectral power in the green-yellow wavelength range, a full width at half maximum of at least 50 nm, and chromaticity coordinates u’ yellow , v’ yellow , where the first luminescent material includes a luminescent material of the A3B5O 12 :Ce 3+ type, where A includes one or more of Y, La, Gd, Tb, and Lu, and where B includes one or more of Al, Ga, In, and Sc; (ii) optionally, a second luminescent material, which is configured to convert at least a part of the device light into second luminescent material light, and the second luminescent material light has spectral power in the orange-red wavelength range, a full width at half maximum of at least 50 nm, and chromaticity coordinates u’ red , v’ red , where the second luminescent material includes one or more luminescent materials of the MS:Eu 2+ , M2Si5N8:Eu 2+ , MAlSiN3:Eu 2+ and Ca2AlSi3O2N5:Eu 2+ types, where M includes one or more of Ba, Sr, and Ca; and (iii) a third luminescent material, which is configured to convert at least a part of the device light into third luminescent material light in the orange-red wavelength range, where the third luminescent material includes M’ x M 2-2x AX6 doped with tetravalent manganese, where M’ includes alkaline earth cations, where M includes cations, x is in the range of 0 - 1, where A includes tetravalent cations, where X includes monovalent anions, including at least fluorine;

[0119] - The light generation system is configured to generate system light, which includes (i) at least a portion of the device light, (ii) at least a portion of the first luminescent material light, and (iii) at least a portion of the third luminescent material light; wherein the system is configured such that the system light is white light having a correlated color temperature (CCT) selected from the range of 1800K - 6500K,

[0120] - wherein the contribution of the third luminescent material light to the spectral power distribution of the system light in the wavelength range of 380nm - 780nm is defined as fraction G, and the following applies:

[0121] (a) When the system light (1001) includes the second luminescent material light (221), the fraction G is selected from the range of 0.95*G’ - 1.05*G’, where G’ conforms to the following formula:

[0122] G’ = 1.4421 - 2.904125*10 -8 *PWL - 10.08921*u’ Yellow - 0.5457286*u’ Red - 1.074782*10 -4 *CCT + 21.623*[u’ Yellow 2 - 1.639*[u’ Red 2 + 4.921703*10 -9 *[CCT] 2 + 2.316461*10 -7 *[PWL*u’ Red + 7.268292*[u’ Yellow *u’ Red + 9.309924*10 -5 *[u’ Red *CCT]

[0123] And wherein the fraction G is at least 0.05 and at most 0.2; or

[0124] (b) When the system light does not include the second luminescent material light, the following applies: u’ Yellow ≥ 0.95*(0.2546 - 0.000016*CCT), and the fraction G is at least 0.05 and at most 0.2; and

[0125] - wherein the spectral power distribution of the system light has the following contributions:

[0126] Wavelength Range Minimum Maximum 380nm - 400nm 0％ 1％ 400nm - 420nm 0％ 1％ 420nm - 440nm 0％ 3％ 440nm - 460nm 6％ 11％ 460nm - 480nm 1％ 9％ 480nm - 500nm 2％ 9％ 500nm - 520nm 6％ 9％ 520nm - 540nm 7％ 10％ 540nm - 560nm 7％ 11％ 560nm - 580nm 7％ 10％ 580nm - 600nm 7％ 10％ 600nm - 620nm 9％ 12％ 620nm - 640nm 12％ 19％ 640nm - 660nm 3％ 6％ 660nm - 680nm 1％ 3％ 680nm - 700nm 0％ 2％ 700nm - 720nm 0％ 1％ 720nm - 740nm 0％ 1％ 740nm - 760nm 0％ 1％ 760nm - 780nm 0％ 1％

[0127] Additional embodiments are provided according to claims 2 - 15.​​

[0128] The light generating system can be part of or applied to, for example, an office lighting system, a home application system, a store lighting system, a household lighting system, an accent lighting system, a spotlight system, a theater lighting system, an optical fiber application system, a projection system, a self-luminous display system, a pixelated display system, a segmented display system, a warning sign system, a medical lighting application system, an indicator sign system, a decorative lighting system, a portable system, an automotive application, an (outdoor) road lighting system, a city lighting system, a greenhouse lighting system, horticultural lighting, digital projection or LCD backlighting. The light generating system (or luminaire) can be part of or applied to, for example, an optical communication system or a disinfection system.

[0129] The terms "white light" and similar terms herein are known to those skilled in the art. It can particularly refer to light having a correlated color temperature (CCT) between about 1800K and 20000K, such as 2000K to 20000K, particularly 2700K - 20000K, for general lighting, particularly in the range of about 2000K - 7000K, such as in the range of 2700K to 6500K. In an embodiment, for example, for backlighting purposes or other purposes, the correlated color temperature (CCTV) can particularly be in the range of about 7000K to 20000K. Further, in an embodiment, the correlated color temperature (CCT) and the BBL (black body locus) are particularly within about 15 SDCM (standard deviation of color matching), particularly within about 10 SDCM from the BBL, and even more particularly within about 5 SDCM from the BBL. In an embodiment, the white light herein has a CRI of at least 90, such as at least 92, more particularly at least 94, and in an embodiment, even at least 95.

[0130] The terms "visible", "visible light" or "visible emission" and similar terms refer to light having one or more wavelengths in the range of about 380nm - 780nm. Here, UV can particularly refer to wavelengths selected from the range of 190nm - 380nm, such as 200nm - 380nm.

[0131] The terms "light" and "radiation" can be used interchangeably herein, unless it is clear from the context that the term "light" only refers to visible light. Thus, the terms "light" and "radiation" can refer to UV radiation, visible light and IR radiation. In a particular embodiment, particularly for lighting applications, the terms "light" and "radiation" refer to (at least) visible light.

[0132] The term "control" and similar terms refer at least in particular to determining the behavior of an element or supervising the operation of an element. Thus, "control" and similar terms in this document can refer to imposing behavior on an element (determining the behavior or supervising the operation of the element), such as measuring, displaying, actuating, opening, moving, changing the temperature, etc. In addition to this, the term "control" and similar terms can also include monitoring. Thus, the term "control" and similar terms can include imposing behavior on an element and can also include imposing behavior on an element and monitoring the element. The control of an element can be carried out by a control system, which can also be designated as a "controller". Thus, the control system and the element can be functionally coupled at least temporarily or permanently. The element can include the control system. In an embodiment, the control system and the element can be not physically coupled. The control can be carried out via wired and / or wireless control. The term "control system" can also refer to a plurality of different control systems that are functionally coupled in particular, and where for example one control system can be a main control system and one or more other control systems can be slave control systems. The control system can include a user interface or can be functionally coupled to a user interface.

[0133] The control system can also be configured to receive and execute instructions from a remote control. In an embodiment, the control system can be controlled via an App on a device, such as a portable device, like a smartphone or iPhone, a tablet, etc. Thus, the device does not necessarily have to be coupled to the lighting system, but can be (temporarily) functionally coupled to the lighting system.

[0134] Thus, in an embodiment, the control system can (also) be configured to be controlled by an App on a remote device. In such an embodiment, the control system of the lighting system can be a slave control system or in a slave mode of control. For example, the lighting system can be identified by a code, particularly a unique code of the corresponding lighting system. The control system of the lighting system can be configured to be controlled by an external control system, which can access the lighting system based on the knowledge of the (unique) code (input by a user interface having an optical sensor, such as a QR code reader). The lighting system can also include components for communicating with other systems or devices, such as based on Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX or another wireless technology.

[0135] A system, apparatus, or device may perform an action in a "mode" or "operating mode" or "mode of operation" or "operational mode". The term "operating mode" may also be referred to as "control mode". Similarly, in a method, an action or stage or step may be performed in a "mode" or "operating mode" or "mode of operation" or "operational mode". This does not exclude that the system, apparatus, or device may also be adapted to provide another control mode or multiple other control modes. Similarly, this may not exclude that one or more other modes may be performed before and / or after performing this mode.

[0136] However, in an embodiment, a control system may be provided that is adapted to provide at least a control mode. If other modes are available, the selection of these modes may be performed, in particular, via a user interface, although other options are also possible, such as performing a mode based on a sensor signal or a (time) schedule. In an embodiment, the operating mode may also refer to a system, apparatus, or device that can only operate in a single operating mode (i.e., "on", without further adjustability).

[0137] Thus, in an embodiment, the control system may be controlled based on 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 schedule.

[0138] In yet another aspect, the present invention also provides a lamp or luminaire that includes a light generation system as described herein. The luminaire may further include a housing, an optical element, a louver, etc. The lamp or luminaire may also include a housing that encloses the light generation system. The lamp or luminaire may include a light window or a housing opening in the housing through which the system light may escape from the housing. In yet another aspect, the present invention also provides a projection device that includes a light generation system as described herein. In particular, the projection device or "projector" or "image projector" may be an optical device that projects an image (or a moving image) onto a surface (such as, for example, a projection screen). The projection device may include one or more light generation systems as described herein. Thus, in one aspect, the present invention also provides a light generation device selected from the group consisting of a lamp, a luminaire, a projector device, a disinfection device, a photoreactor, and an optical wireless communication device, the device including the light generation system defined herein. The light generation device may include a housing or a carrier configured to accommodate or support one or more elements of the light generation system. For example, in an embodiment, the light generation device may include a housing or a carrier configured to accommodate or support one or more light generation devices in the light generation device and optionally accommodate or support two or more luminescent materials.

[0139] Instead of the terms "lighting device" or "lighting system" and similar terms, the terms "light generating device" or "light generating system" (and similar terms) can also be applied. A lighting device or lighting system can be configured to generate device light (or "lighting device light") or system light ("or lighting system light"). As described above, the terms light and radiation can be used interchangeably.

[0140] A lighting device can include a light source. In an embodiment, the device light can include one or more of source light and converted source light (such as luminescent material light).

[0141] A lighting system can include a light source. In an embodiment, the system light can include one or more of source light and converted source light (such as luminescent material light). BRIEF DESCRIPTION OF THE DRAWINGS

[0142] Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which corresponding reference numerals indicate corresponding parts, and in the drawings:

[0143] FIGS. 1a - 1b schematically depict some embodiments of the system;

[0144] FIGS. 2a - 2c depict some spectral power distributions; and

[0145] Figure 3 Some application embodiments are schematically depicted.

[0146] The schematic diagrams are not necessarily drawn to scale. DETAILED DESCRIPTION

[0147] FIG. 1 schematically depicts an embodiment of a light generating system 1000 including a light generating device 100 and two or more luminescent materials 200.

[0148] In particular, the light generating device 100 is configured to generate device light 101 having a peak wavelength selected from the wavelength range of 440 nm - 465 nm. In an embodiment, the light generating device 100 includes a solid - state light source. In an embodiment, the device light 101 can have a peak wavelength selected from the wavelength range of 445 nm - 460 nm.

[0149] In particular, two or more luminescent materials 200 are configured to convert at least a portion of the device light into luminescent material light. The two or more luminescent materials 200 can include (i) a first luminescent material 210, which is configured to convert at least a portion of the device light 101 into first luminescent material light 211, which has spectral power in the green - yellow wavelength range, a full width at half maximum of at least 50 nm, and color points u’ yellow , v’ yellow; (ii) Optionally, a second luminescent material 220, which is configured to convert at least a part of the device light 101 into a second luminescent material light 221 having a spectral power in the orange - red wavelength range, a full width at half maximum of at least 50 nm, and a chromaticity point u’ red , v’ red ; and (iii) A third luminescent material 230, which is configured to convert at least a part of the device light 101 into a third luminescent material light 231 in the orange - red wavelength range, wherein the third luminescent material 230 comprises M’ x M 2-2x AX6 doped with tetravalent manganese, wherein M’ comprises alkaline earth cations, wherein M comprises cations, x is in the range of 0 - 1, wherein A comprises tetravalent cations, wherein X comprises monovalent anions, including at least fluorine.

[0150] The light generation system 1000 is particularly configured to generate system light 1001, which comprises (i) at least a part of the device light 101, (ii) at least a part of the first luminescent material light 211, and (iii) at least a part of the third luminescent material light 231. In an embodiment, the correlated color temperature CCT of the system light 1001 can be selected from the range of 2700K - 6500K.

[0151] In an embodiment, the first luminescent material 210 can comprise a luminescent material of the A3B5O 12 :Ce type, 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. In particular, in an embodiment, the first luminescent material 210 can comprise Lu3B5O 12 :Ce 3+ , Y3Al5O 12 :Ce 3+ , Y3Al,Ga5O 12 :Ce 3+ and Gd,Y3B5O 12 :Ce, or one or more of them.

[0152] In an embodiment, regarding the third luminescent material 230, for the doped M’ x M 2-2x AX6, x = 0 can be applied, M comprises one or more of K and Rb, and wherein X = F.

[0153] In an embodiment, the second luminescent material 220 can comprise M2Si5N8:Eu 2+ , MAlSiN3:Eu 2+ and M2AlSi3O2N5:Eu 2+one or more of, where M includes one or more of Ba, Sr, and Ca. In particular, in an embodiment, the second luminescent material 220 may include MAlSiN3:Eu 2+ ; where M includes at least Sr and Ca.

[0154] In an embodiment, the first luminescent material 210 may have a color point in the range selected from 0.135 ≤ u’ ≤ 0.200 and 0.555 ≤ v’ ≤ 0.575; the second luminescent material 220 may have a color point in the range selected from 0.33 ≤ u’ ≤ 0.48 and 0.525 ≤ v’ ≤ 0.550; and the third luminescent material 230 may have a color point in the range selected from 0.52 ≤ u’ ≤ 0.54 and 0.51 ≤ v’ ≤ 0.53.

[0155] As schematically depicted, the system 1000 may include one or more light generating devices 100 and a luminescent element 2200, where the luminescent element 2200 includes a first luminescent material 210, an (optional) second luminescent material 220, and a third luminescent material 230. In particular, the luminescent element 2200 may be configured downstream of one or more light generating devices 100. In a particular embodiment, the luminescent element 2200 may be configured to be in contact with one or more light generating devices 100.

[0156] Figure 1a depicts multiple embodiments very schematically. Embodiments I-IV schematically show embodiments based on the following arrangement, i.e., all luminescent materials 200 are pumped by the same device light 101 and the same device 100. Optionally, the device 100 may refer to multiple identical devices that pump the same luminescent material 200 and are not necessarily individually controllable.

[0157] Embodiments I and III relate to a luminescent element 2200 including multiple layers, where in Embodiment I there are three luminescent materials 210, 220, 230, and in Embodiment III there are two luminescent materials 210, 230. Note that the order of the luminescent materials 200 may be different from the order shown. Embodiments II and IV respectively relate to the same luminescent materials 200 as in Embodiments I and III, but are included not as multiple layers but as a mixture. Thus, the system light 1001 in Embodiments I and II includes a first device light 101, a first luminescent material light 211, a second luminescent material light 221, and a third luminescent material light 231. However, the system light 1001 in Embodiments III and IV includes a first device light 101, a first luminescent material light 211, and a third luminescent material light 231.

[0158] Display embodiments V and VI are shown to illustrate that optionally different pumps can be used to pump different luminescent materials 200 (in combination). For example, the light generating devices 100 in embodiments V and VI can be controlled individually. In this way, the color point of the system light 1001 can be controlled.

[0159] Reference numeral 410 refers to an optical element that can be disposed downstream of the luminescent material 200.

[0160] The term "optical device" can particularly refer to one or more optical elements. Thus, the terms "optical device" and "optical element" can refer to the same item. An optical device can include one or more mirrors, reflectors, collimators, lenses, prisms, diffusers, phase plates, polarizers, diffraction elements, gratings, dichroics, arrays of one or more of the above items, etc. Alternatively or additionally, the term "optical device" can refer to a holographic element or a hybrid rod. In an embodiment, the optical device can include one or more of a beam expander optical device and a zoom lens optical device. See above for examples of optical devices. In an embodiment, the optical device can include an integrator, such as a "Koehler integrator" (or " integrator"). Here, the optical element 410 can alternatively or additionally include a diffuser.

[0161] FIG. 1b schematically depicts some additional embodiments. For example, the light generating system 1000 can include a chip-on-board (I), an LED package (II), or an LED filament (III), which includes a light generating device 100 and two or more luminescent materials 200.

[0162] FIGS. 2a-2c show some spectral power distributions of the system light 1001. Referring to FIG. 2a, embodiments I and II relate to spectral power distributions that also include second luminescent material light 221 that respectively accounts for 13.3% and 16.9% of the third luminescent material light 231 in the spectral power distribution of light in the visible wavelength range. The CCTs are 3998K and 4035K, respectively, and the CRIs are 95.2 and 96.4, respectively. In embodiments I and II of FIG. 2a, the PWL of the light generating device 100 is 450 nm. In embodiments I and II, the first luminescent material is Y3(Al,Ga)5O 12 :Ce 3+ with a color point (u', v') of (0.160, 0.557). In embodiment I, the second luminescent material is (Ca,Sr)AlSiN3:Eu 2+ with a color point (u', v') of (0.412, 0.538). In embodiment II, the second luminescent material is (Ca,Sr)AlSiN3:Eu 2+, and its color point (u’, v’) is (0.338, 0.549). In Examples I and II, the third luminescent material is K2SiF6:Mn 4+ , and its color point (u’, v’) is (0.531, 0.520). The conversion efficiency is very high. However, the conversion efficiency of Example II (higher Mn 4+ luminescence contribution) is higher than that of Example I (lower Mn 4+ fluorescence contribution).

[0163] Table 3 shows the peak wavelength of the light generation device of the spectrum shown in Fig. 2a, the contribution of the luminescent material to the total spectral power distribution of the system light 1001, and the details of the characteristics of the system light 1001, where "EB" refers to the example, "LGD(%)" refers to the contribution of the unconverted light of the light generation device to the total spectral power distribution of the system light, "FLM(%)" refers to the contribution of the first luminescent material light to the total spectral power distribution of the system light, "SLM(%)" refers to the contribution of the second luminescent material light to the total spectral power distribution of the system light, "TLM(%)" refers to the contribution of the third luminescent material light to the total spectral power distribution of the system light, "CRI" refers to the color rendering index, "CCT" refers to the correlated color temperature, and "LER" refers to the luminous efficiency.

[0164] Table 3

[0165]

[0166] Referring to Fig. 2b, Examples I, II, and III respectively refer to the spectral power distributions when the CCT is 4000K, 5000K, and 6500K without the second luminescent material light 221. The higher the CCT, the relatively higher the blue peak intensity. In Examples I, II, and III of Fig. 2b, the PWLs of the light generation device 100 are 455nm, 455nm, and 450nm respectively. In Example I, the first luminescent material is Y3Al5O 12 :Ce 3+ , and its color point (u’, v’) is (0.191, 0.565). In Example II, the first luminescent material is Y3(Al,Ga)5O 12 :Ce 3+ , and its color point (u’, v’) is (0.179, 0.563). In Example III, the first luminescent material is Y3(Al,Ga)5O 12 :Ce 3+ , and its color point (u’, v’) is (0.160, 0.557). In Examples I, II, and III, the third luminescent material is K2SiF6:Mn 4+, and its color points (u', v') are (0.531, 0.520). The contributions of the third luminescent material light 231 to the spectral power distribution of light in the visible wavelength range are 17.7, 14.0, and 14.4, respectively. The conversion efficiency is also high and decreases as the CCT increases.

[0167] Table 4 shows the peak wavelength of the light generation device of the spectrum shown in Fig. 2b, the contributions of the luminescent materials to the total spectral power distribution of the system light, and the details of the characteristics of the system light, where "EB" refers to the embodiment, "LGD(%)" refers to the contribution of the unconverted light of the light generation device to the total spectral power distribution of the system light, "FLM(%)" refers to the contribution of the first luminescent material light to the total spectral power distribution of the system light, "TLM(%)" refers to the contribution of the third luminescent material light to the total spectral power distribution of the system light, "CRI" refers to the color rendering index, "CCT" refers to the correlated color temperature, and "LER" refers to the luminous efficiency.

[0168] Table 4

[0169]

[0170] Referring to Fig. 2c, Embodiments I, II, and III respectively refer to the spectral power distributions of the system light 1001 with the second luminescent material light 221 when the CCT is 4035K, 5003K, and 6495K. The higher the CCT, the relatively higher the blue peak intensity. In Embodiments I, II, and III of Fig. 2c, the PWLs are 450nm, 455nm, and 455nm, respectively. In Embodiments I, II, and III, the first luminescent material is Y3(Al,Ga)5O 12 :Ce 3+ , and its color points (u', v') are (0.160, 0.557). In Embodiments I and II, the second luminescent material is (Ca,Sr)AlSiN3:Eu 2+ , and its color points (u', v') are (0.338, 0.549). In Embodiment III, the second luminescent material is (Ca,Sr)AlSiN3:Eu 2+ , and its color points (u', v') are (0.376, 0.543). In Embodiments I, II, and III, the third luminescent material is K2SiF6:Mn 4+ , and its color points (u', v') are (0.531, 0.520). The contributions of the third luminescent material light 231 to the spectral power distribution of light in the visible wavelength range are 18.0%, 15.1%, and 11.5%, respectively. The conversion efficiency is also high and decreases as the CCT increases.

[0171] Table 5 shows the peak wavelength of the light generation device of the spectrum shown in FIG. 2c, the contribution of the luminescent material to the total spectral power distribution of the system light 1001, and the details of the characteristics of the system light, where "EB" refers to the embodiment, "LGD(%)" refers to the contribution of the unconverted light of the light generation device to the total spectral power distribution of the system light, "FLM(%)" refers to the contribution of the first luminescent material light to the total spectral power distribution of the system light, "SLM(%)" refers to the contribution of the second luminescent material light to the total spectral power distribution of the system light, "TLM(%)" refers to the contribution of the third luminescent material light to the total spectral power distribution of the system light, "CRI" refers to the color rendering index, "CCT" refers to the correlated color temperature, and "LER" refers to the luminous efficiency.

[0172] Table 5

[0173]

[0174] Table 6 shows additional embodiments of the light generation device that generates the system light 1001 with the second luminescent material light 221 according to the present invention. In Embodiments A and B, the first luminescent material is Y3(Al,Ga)5O 12 :Ce 3+ and its color point (u', v') is (0.160, 0.557). In Embodiments A and N, the second luminescent material is (Ca,Sr)AlSiN3:Eu 2+ and its color point (u', v') is (0.338, 0.549). In Embodiments A and B, the third luminescent material is K2SiF6:Mn 4+ and its color point (u', v') is (0.531, 0.520). Table 6 shows the peak wavelength of the light generation device, the contribution of the luminescent material to the total spectral power distribution of the system light, and the details of the characteristics of the system light, where "EB" refers to the embodiment, "LGD(%)" refers to the contribution of the unconverted light of the light generation device to the total spectral power distribution of the system light, "FLM(%)" refers to the contribution of the first luminescent material light to the total spectral power distribution of the system light, "SLM(%)" refers to the contribution of the second luminescent material light to the total spectral power distribution of the system light, "TLM(%)" refers to the contribution of the third luminescent material light to the total spectral power distribution of the system light, "CRI" refers to the color rendering index, "CCT" refers to the correlated color temperature, and "LER" refers to the luminous efficiency.

[0175] Table 6

[0176]

[0177] In particular, the system can be configured such that the system light 1001 is white light, the white light having a correlated color temperature CCT in the range selected from 1800K - 6500K, an R of at least 85 fValue, R of at least 85 f,h1 Value, R of at least 95 g Value, R of at least -1% cs,h1 Value, where R f , R f,h1 , R g and R cs,h1 Is defined according to the TM-302020 standard ANSI / IES TM-30-20: IES Method for Evaluating Light Source Color Rendering, where the contribution of the third luminescent material light 231 to the spectral power distribution of the system light 1001 in the wavelength range of 380nm - 780nm is defined as the fraction G, and the following applies: (a) When the system light 1001 (also) includes the second luminescent material light 221, the fraction G is selected from the range of 0.95*G’ - 1.05*G’, where G’ conforms to the following formula: G’ = 1.4421 - 2.904125*10 -8 *PWL - 10.08921*u’ Yellow -0.5457286*u’ Red -1.074782*10 -4 *CCT + 21.623*[u’ Yellow 2 -1.639*[u’ Red 2 +4.921703*10 -9 *[CCT] 2 +2.316461*10 -7 *[PWL*u’ Red +7.268292*[u’ Yellow *u’ Red +9.309924*10 -5 *[u’ Red *CCT], where the fraction G is at least 0.05 and at most 0.2; or (b) when the system light 1001 does not include the second luminescent material light 221, the following applies: u’ Yellow ≥0.95*0.2546 - 0.000016*CCT, and the fraction G is at least 0.05 and at most 0.2. The spectral power distributions shown here all meet these conditions. In addition, the CRI is higher than 89, or even higher than 91. For example, R f value exceeds 86, R g values all exceed 96, R f,h1 values all exceed 88, R cs,h1 values all exceed -0.6%.

[0178] In particular, G can be selected from the range of 0.97*G’ - 1.03*G’, or where u’ Yellow ​​≥0.97 * 0.2546 - 0.000016 * CCT; More particularly, G may be selected from the range of 0.99 * G’ - 1.01 * G’, or where u’ Yellow ≥0.99 * 0.2546 - 0.000016 * CCT. In particular, in embodiments, the fraction G is at least 0.1.

[0179] In embodiments where the system light 1001 does not include the second luminescent material light 221, the correlated color temperature may be selected from the range of at least 3800K, such as selected from the range of 4000K - 6500K. In particular, in these embodiments, the correlated color temperature is at least 3800K, and A3B5O 12 :Ce 3+ in which A includes Gd and / or where A3B5O 12 :Ce 3+ in which B includes less than 10% Ga. As described above, in certain embodiments (see also FIG. 1a), two or more luminescent materials 200 are composed of a first luminescent material 210 and a third luminescent material 230. In particular, in such embodiments, the first luminescent material light 211 may have a color point selected from the range of 0.15 ≤ u’ ≤ 0.200 and 0.555 ≤ v’ ≤ 0.575.

[0180] However, in other embodiments, also see FIG. 1a, the system light 1001 includes the second luminescent material light 221. In certain embodiments, two or more luminescent materials 200 may be composed of a first luminescent material 210, a second luminescent material 220, and a third luminescent material 230.

[0181] In embodiments, the spectral power distribution of the system light 1001 may have the contributions defined in Table 1 (above). For example, this may apply to the spectral power distributions shown in FIGS. 2a - 2b.

[0182] Figure 3 An embodiment of a luminaire 2 including the light generation system 1000 as described above is schematically depicted. The reference numeral 301 indicates a user interface that may be functionally coupled to or functionally coupled with the control system 300 included in the light generation system 1000. Figure 3 An embodiment of a lamp 1 including the light generation system 1000 is also schematically depicted. The reference numeral 3 indicates a projector device or a projector system that may be used to project an image, such as on a wall, which may also include the light generation system 1000. Thus, Figure 3An embodiment of the lighting device 1200 selected from the group of the lamp 1, the luminaire 2, the projector device 3, the disinfection device, the photoreactor, and the optical wireless communication device is schematically depicted. The device includes the light generation system 1000 described herein. In an embodiment, such a lighting device may be the lamp 1, the luminaire 2, the projector device 3, the disinfection device, or the optical wireless communication device. The lighting device light escaping from the lighting device 1200 is denoted by the reference numeral 1201. The lighting device light 1201 may consist essentially of the system light 1001 and, thus, in a particular embodiment, may be the system light 1001. The reference numeral 1300 refers to a space, such as a room. The reference numeral 1305 refers to the floor, the reference numeral 1310 refers to the ceiling; the reference numeral 1307 refers to the wall.

[0183] The term "plurality" refers to two or more.

[0184] Those skilled in the art will understand the terms "substantially" or "essentially" and similar terms herein. The terms "substantially" or "essentially" may also include embodiments having "entirely", "completely", and "wholly", etc. Thus, in an embodiment, the adjectives substantially or essentially may also be deleted. Where applicable, the term "substantially" or the term "essentially" may also relate to 90% or higher, such as 95% or higher, particularly 99% or higher, or even more particularly 99.5% or higher (including 100%).

[0185] The term "comprising" also includes embodiments in which the term "comprising" means "consisting of".

[0186] The term "and / or" particularly relates to one or more items mentioned before and after the "and / or". For example, the phrase "item 1 and / or item 2" and similar phrases may be related to one or more of item 1 and item 2. In one embodiment, the term "comprising" may mean "consisting of", but in another embodiment, it may also mean "at least containing the defined species and optionally one or more other species".

[0187] Furthermore, the terms first, second, third, etc. in the specification and claims are used to distinguish similar elements and are not necessarily used to describe an order or a temporal order. It should be understood that the terms so used are interchangeable where appropriate, and the embodiments of the present invention described herein are capable of operating in other orders than those described or shown herein.

[0188] During operation, devices, apparatuses, or systems, etc. may be described herein. Those skilled in the art will appreciate that the present invention is not limited to an operating method, or a device, apparatus, or system in operation.

[0189] It should be noted that the above embodiments illustrate rather than limit the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

[0190] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0191] The use of the verb “comprise” and its conjugations does not exclude the presence of other elements or steps than those recited in the claim. Unless the context clearly requires otherwise, throughout the description and claims, the words “comprise,” “comprising,” etc. shall be construed in an inclusive sense, rather than an exclusive or exhaustive sense; that is, in the sense of “including, but not limited to.”

[0192] The article “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.

[0193] The present invention may be implemented by hardware comprising several distinct elements and by a suitably programmed computer. In a device claim, an apparatus claim, or a system claim listing several means, several of these means may be embodied by the same hardware. The fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be advantageous. On the other hand, the present invention (thus) provides a software product which, when run on a computer, is capable of implementing the methods (one or more embodiments) described herein.

[0194] The present invention also provides a control system which may control a device, an apparatus, or a system, or may execute a method or process described herein. In addition, the present invention provides a computer program product which, when run on a computer functionally coupled to or consisting of a device, an apparatus, or a system, controls one or more controllable elements of such device, apparatus, or system.

[0195] The present invention also applies to a device, an apparatus, or a system comprising one or more features described in the description and / or shown in the drawings. The present invention also relates to a method or process which comprises one or more features described in the description and / or shown in the drawings.

[0196] The various aspects discussed in this patent may be combined to provide additional advantages. In addition, those skilled in the art will understand that embodiments may be combined, and more than two embodiments may also be combined. In addition, some features may form the basis for one or more divisional applications.

Claims

1. A light generation system (1000) comprising a light generation device (100) and two or more luminescent materials (200), wherein: The light generation device (100) is configured to generate device light (101) having a peak wavelength PWL selected from the wavelength range of 440 nm to 465 nm; wherein the light generation device (100) comprises a solid-state light source; The two or more luminescent materials include (i) a first luminescent material (210), (ii) an optional second luminescent material (220), and (iii) a third luminescent material (230). The first luminescent material is configured to convert at least a portion of the device light (101) into first luminescent material light (211) having spectral power in the green-yellow wavelength range, a full width at half maximum of at least 50 nm, and chromaticity coordinates u’ yellow , v’ yellow , wherein the first luminescent material (210) comprises a luminescent material of the A3B5O 12 :Ce 3+ type, where A comprises one or more of Y, La, Gd, Tb, and Lu, and where B comprises one or more of Al, Ga, In, and Sc; the second luminescent material is configured to convert at least a portion of the device light (101) into second luminescent material light (221) having spectral power in the orange-red wavelength range, a full width at half maximum of at least 50 nm, and chromaticity coordinates u’ red , v’ red , wherein the second luminescent material (220) comprises one or more luminescent materials of the types MS:Eu 2+ , M2Si5N8:Eu 2+ , MAlSiN3:Eu 2+ , and Ca2AlSi3O2N5:Eu 2+ , where M comprises one or more of Ba, Sr, and Ca; the third luminescent material is configured to convert at least a portion of the device light (101) into third luminescent material light (231) in the orange-red wavelength range, wherein the third luminescent material (230) comprises M’ x M 2-2x AX6 doped with tetravalent manganese, where M’ comprises alkaline earth cations, where M comprises cations, x is in the range of 0 to 1, where A comprises tetravalent cations, and where X comprises monovalent anions including at least fluorine; The light generation system (1000) is configured to generate system light (1001), the system light including (i) at least a portion of the device light (101), (ii) at least a portion of the first luminescent material light (211), and (iii) at least a portion of the third luminescent material light (231); wherein the system (1000) is configured such that the system light (1001) is white light having a correlated color temperature (CCT) selected from the range of 1800K to 6500K, an R f value of at least 85, an R f,h1 value of at least 85, an R g value of at least 95, an R cs,h1 value of at least -1%, where R f , R f,h1 , R g , and R cs,h1 are defined according to the TM-30(2020) standard ANSI / IES TM-30-20: IES Method for Evaluating Light Source Color Rendering, wherein the contribution of the third luminescent material light (231) to the spectral power distribution of the system light (1001) in the wavelength range from 380 nm to 780 nm is defined as fraction G, and wherein the following applies: (a) When the system light (1001) comprises the second luminescent material light (221), the fraction G is selected from the range of 0.95*G’ - 1.05*G’, where G’ conforms to the following formula: G’ = 1.4421 - 2.904125 * 10 -8 *PWL - 10.08921 * u’ Yellow -0.5457286 * u’ Red -1.074782 * 10 -4 *CCT + 21.623 * [u’ Yellow 2 -1.639 * [u’ Red 2 +4.921703 * 10 -9 *[CCT] 2 +2.316461 * 10 -7 *[PWL * u’ Red +7.268292 * [u’ Yellow *u’ Red +9.309924 * 10 -5 *[u’ Red *CCT]​​ And wherein the fraction G is at least 0.05 and at most 0.2; or (b) When the system light (1001) does not include the second luminescent material light (221), the following applies: u’ Yellow ≥ 0.95 * (0.2546 - 0.000016 * CCT), and the fraction G is at least 0.05 and at most 0.

2.

2. The light generation system (1000) according to claim 1, wherein G is selected from the range of 0.97*G’ - 1.03*G’, or wherein u’ Yellow ≥ 0.97*(0.2546 - 0.000016*CCT); and wherein the correlated color temperature (CCT) is selected from the range of 2700K to 6500K.

3. The light generation system (1000) according to any one of the preceding claims, wherein the first luminescent material (210) comprises one or more of Lu3Al5O 12 :Ce 3+ , Y3Al5O 12 :Ce 3+ , Y3(Al,Ga)5O 12 :Ce 3+ and (Gd,Y)3Al5O 12 :Ce 3+ .

4. The light generation system (1000) according to any one of the preceding claims, wherein for the doped M’ x M 2- 2x AX6 applies x = 0, and M comprises one or more of K and Rb, wherein A comprises Si, and wherein X = F; and wherein G is selected from the range of 0.99*G’ - 1.01*G’, or wherein u’ Yellow ≥ 0.99*(0.2546 - 0.000016*CCT); and wherein the correlated color temperature (CCT) is selected from the range of 2700K to 6500K.

5. The light generation system (1000) according to any one of the preceding claims, wherein the device light (101) has a peak wavelength selected from the wavelength range of 445 nm to 460 nm.

6. The light generation system (1000) according to any one of the preceding claims, wherein the fraction G is at least 0.

1.

7. The light generation system (1000) according to any one of claims 1 to 6, wherein the system light (1001) does not comprise the second luminescent material light (221), and wherein the correlated color temperature is selected from the range of 4000 K to 6500 K.

8. The light generation system (1000) according to claim 7, wherein the two or more luminescent materials consist of the first luminescent material (210) and the third luminescent material (230).

9. The light generation system (1000) according to any one of the preceding claims 1 to 6, wherein the system light (1001) comprises the second luminescent material light (221); wherein the second luminescent material (220) comprises one or more luminescent materials selected from the group consisting of: (Sr,Ca)S:Eu 2+ , (Sr,Ca)AlSiN3:Eu 2+ and (Sr,Ca)2Si5N8:Eu 2+ .

10. The light generation system (1000) according to claim 9, wherein the two or more luminescent materials consist of the first luminescent material (210), the second luminescent material (220), and the third luminescent material (230).

11. The optical generation system (1000) according to any one of the preceding claims, wherein: The first luminescent material (210) has a color point selected from the range of 0.135 ≤ u’ ≤ 0.200 and 0.555 ≤ v’ ≤ 0.575; the second luminescent material (220) has a color point selected from the range of 0.33 ≤ u’ ≤ 0.48 and 0.525 ≤ v’ ≤ 0.555; and the third luminescent material (230) has a color point selected from the range of 0.52 ≤ u’ ≤ 0.54 and 0.51 ≤ v’ ≤ 0.

53.

12. The light generation system (1000) according to any one of claims 7 to 8 and according to claim 11, wherein the first luminescent material light (211) has a color point selected from the range of 0.15 ≤ u’ ≤ 0.200 and 0.555 ≤ v’ ≤ 0.

575.

13. The light generation system (1000) according to any one of the preceding claims, wherein the spectral power distribution of the system light (1001) has the following contributions:

14. The light generation system (1000) according to any one of the preceding claims 1 to 13, wherein the light generation system (1000) comprises an on-board chip, an LED filament or an LED package, and the on-board chip, the LED filament or the LED package comprises the light generation device (100) and the two or more luminescent materials (200).

15. An illumination device (1200) selected from the group consisting of a lamp (1), a luminaire (2), a projector device (3), a disinfection device, a photoreactor, and an optical wireless communication device, the illumination device comprising the light generation system (1000) according to any one of the preceding claims 1 to 13.

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