High brightness laser phosphor illumination with CCT control

Abstract

The invention provides a light generating system comprising a first light generating device, a second light generating device, a first luminescent material and a control system wherein: (A) the first light generating device comprises a first laser light source and is configured to generate first device light (111) having a first device light peak wavelength ([lambda] 1) and having a first spectral power distribution; wherein a first device light peak wavelength ([lambda] 1) is selected from a wavelength range of 425 nm to 465 nm; (B) a second light generating device comprising a second laser light source and configured to generate second device light (121) having a second device light peak wavelength ([lambda] 2) and having a second spectral power distribution different from the first spectral power distribution; wherein a second device light peak wavelength ([lambda] 2) is selected in the range from 470 nm to 490 nm; (C) the first luminescent material is configured in a light-receiving relationship with the first light-generating device and is configured to convert at least part of the first device light into first luminescent material light having a luminescent material emission centroid wavelength ([lambda] c, 1) within the green-yellow wavelength range; and the first luminescent material is not configured in a light-receiving relationship with the second light-generating device; (D) the light generating system is configured to generate system light (1001) comprising one or more of the first device light, the second device light, and the first luminescent material light, wherein the system light has a controllable correlated color temperature; and (E) the control system is configured to control the first light generating device and the second light generating device such that (a) in a first mode of operation of the light generating system, the system light has a first correlated color temperature CCT1 with CCT1 > = 4000 K, (b) in a second mode of operation of the light generating system, the system light has a second correlated color temperature (CCT2) with CCT2-CCT1 > = 1000 K, (c) in at least one of the operating modes, the system light has a correlated color temperature selected from the range of at least 7000 K, and (d) the system light has a color rendering index of at least 70 in both operating modes.

Description

Technical Field

[0001] The invention relates to a light generating system and a lighting device comprising such a light generating system. Background Art

[0002] Lasers including light emitting devices are known in the art. For example, US2020 / 0232919 describes a method for producing a light emitting device, comprising: providing a fluorescent material; dividing a plurality of laser elements into a short wavelength group and a long wavelength group, so that light emitted from the laser elements in the short wavelength group has a peak wavelength shorter than the excitation peak wavelength of the fluorescent material, and light emitted from the laser elements in the long wavelength group has a peak wavelength longer than the excitation peak wavelength of the fluorescent material; and selecting one or more of the plurality of laser elements from each of the short wavelength group and the long wavelength group to combine with the fluorescent material to produce the light emitting device.

[0003] WO2021 / 063878A1 discloses a light generating device, which is configured to generate device light and includes: a first laser light source, configured to generate blue first light source light; a second laser light source, configured to generate green second light source light; a third laser light source, configured to generate red third light source light; a fourth laser light source, configured to generate blue fourth light source light; a first luminescent material, configured to convert at least part of the first light source light into a first green / yellow luminescent material light; an optical element, configured to combine (i) unconverted first light source light, (ii) second light source light, third light source light, (iv) fourth light source light and (v) first luminescent material light to provide white device light; and a control system, configured to control the laser light sources. Summary of the invention

[0004] Although white LED sources can deliver, for example, up to about 300 lm / mm 2 The intensity of static phosphor-converted laser white light sources can even reach up to about 20.000lm / mm 2intensity. Ce-doped garnets (e.g. YAG, LuAG) may be the most suitable luminescent converter, which can be used for pumping with blue lasers because the garnet matrix has a very high chemical stability. Further, at low Ce concentrations (e.g. below 0.5%), temperature quenching may only occur above about 200°C. In addition, the emission from Ce has a very fast decay time, so that optical saturation can be basically avoided. Assuming, for example, reflection mode operation, a blue laser can be incident on the phosphor. In an embodiment, this can achieve almost complete conversion of blue light, resulting in the emission of converted light. It is for this reason that it is recommended to use garnet phosphors with relatively high stability and thermal conductivity. However, other phosphors can also be applied. When using extremely high power densities, heat management may still be an issue.

[0005] High brightness light sources can be used for applications such as projection, stage lighting, spotlighting and automotive lighting. For this purpose, laser phosphor technology can be used, where a laser provides the laser light and, for example, a (remote) phosphor converts the laser light into converted light. In an embodiment, the phosphor can be arranged on a heat sink or inserted into a heat sink to improve heat management and thus increase brightness.

[0006] There appears to be a desire to increase the radiant flux and / or improve the efficiency of such light emitting devices. Furthermore, there is a desire for controllable light emitting devices. Furthermore, there is a desire for controllable high CCT (correlated color temperature) light emitting devices with high radiant flux, such as for stage lighting.

[0007] Therefore, one aspect of the present invention is to provide an alternative light generating system (and / or lighting device), which preferably further at least partially eliminates one or more of the above-mentioned disadvantages. The present invention may have the purpose of overcoming or improving at least one of the disadvantages of the prior art, or providing a useful alternative.

[0008] According to a first aspect, the present invention provides a light generating system ("system") comprising a plurality of first light generating devices, a second light generating device and a first luminescent material. In addition, the light generating system may include a control system. In an embodiment, the first light generating device may include a first laser light source. In particular, the plurality of first light generating devices may be configured to generate a first device light, wherein the first device light has a first device light peak wavelength (λ 1 ) and has a first spectral power distribution. In a specific embodiment, the first device light peak wavelength (λ) can be selected from a wavelength range of 425 nm to 465 nm. 1 ). However, in an embodiment, the second light generating device may include a second laser light source. In particular, the second light generating device may be configured to generate a second device light having a second device light peak wavelength (λ 2) and has a second spectral power distribution. In particular, the second spectral power distribution may be different from the first spectral power distribution. In a specific embodiment, the second device light peak wavelength (λ) may be selected from the range of 470 nm to 490 nm. 2 ). Furthermore, in an embodiment, the first luminescent material may be configured to be in a light receiving relationship with the first light generating device and may in particular be configured to convert at least part of the first device light into the first luminescent material light. The first luminescent material light may have a luminescent material emission centroid wavelength (λ) in the green-yellow wavelength range. c,1 ). However, in particular, in an embodiment, the first luminescent material may not be configured to be in a light receiving relationship with the second light generating device. In an embodiment, the light generating system may be configured to generate system light comprising one or more of the first device light, the second device light and the first luminescent material light. In particular, in an embodiment, the system light may have a controllable correlated color temperature. In an embodiment, the control system may be configured to control the first light generating device and the second light generating device so that (a) in a first operating mode of the light generating system, the system light has a first correlated color temperature CCT1, wherein CCT1 ≥ 4000K. Alternatively or additionally, in an embodiment, the control system may be configured to control the first light generating device and the second light generating device so that (b) in a second operating mode of the light generating system, the system light has a second correlated color temperature (CCT2), wherein in particular CCT2-CCT1 ≥ 1000K. Alternatively or additionally, in an embodiment, the control system may be configured to control the first light generating device and the second light generating device such that (c) in at least one of the operating modes, the system light has a correlated color temperature selected from a range of at least 7000K. However, alternatively or additionally, in an embodiment, the control system may be configured to control the first light generating device and the second light generating device such that (d) the system light in both operating modes has a color rendering index of at least 70. Therefore, in particular, the present invention provides in an embodiment a light generating system comprising a first light generating device, a second light generating device, a first luminescent material and a control system, wherein: (A) the first light generating device comprises a first laser light source and is configured to generate a first device light having a first device light peak wavelength (λ 1 ) and having a first spectral power distribution, wherein a first device light peak wavelength (λ) is selected from a wavelength range of 425 nm to 465 nm 1 ); (B) the second light generating device includes a second laser light source and is configured to generate a second device light having a second device light peak wavelength (λ 2 ) and having a second spectral power distribution different from the first spectral power distribution, wherein the second device light peak wavelength (λ) is selected from the range of 470 nm to 490 nm 2(C) the first luminescent material is configured to be in a light receiving relationship with the first light generating device and is configured to convert at least a portion of the first device light into first luminescent material light, the first luminescent material light having a luminescent material emission centroid wavelength (λ) in the green-yellow wavelength range c,1 ); and the first luminescent material is not configured to be in a light receiving relationship with the second light generating device; (D) the light generating system is configured to generate system light, the system light including one or more of the first device light, the second device light and the first luminescent material light, wherein the system light has a controllable correlated color temperature; and (E) the control system is configured to control the first light generating device and the second light generating device so that (a) in a first operating mode of the light generating system, the system light has a first correlated color temperature CCT1, wherein CCT1 ≥ 4000K, (b) in a second operating mode of the light generating system, the system light has a second correlated color temperature (CCT2), wherein CCT2-CCT1 ≥ 1000K, (c) in at least one of the operating modes, the system light has a correlated color temperature selected from a range of at least 7000K, and (d) the system light has a color rendering index of at least 70 (particularly at least 80) in both operating modes.

[0009] With such a system, it is possible to provide high brightness light with a relatively high correlated color temperature, which high brightness light may also have a controllable correlated color temperature. For example, in this way, a relatively simple, low-cost, high brightness laser phosphor light generation system with CCT control may be provided, for example for stage lighting. Furthermore, with the present system, while changing the CCT, in particular at relatively high correlated color temperatures, the color point may be kept relatively close to the black body locus. Furthermore, with the present system, it may also be possible to provide system light with a color rendering index (CRI) greater than 70. In an embodiment, the CRI may be at least 80, such as at least 85. In a specific embodiment, the CRI may even be at least 90.

[0010] As indicated above, the invention provides a light generating system comprising a first light generating device, a second light generating device, a first luminescent material and optionally a control system. In the following, some general aspects related to light generating devices (in general) and laser devices (in general) are first discussed.

[0011] The light generating device may in particular be configured to generate device light. In particular, the light generating device may comprise a light source. The light source may in particular be configured to generate light source light. In embodiments, the device light may consist essentially of the device light. In other embodiments, the device light may consist essentially of converted light source light. In other embodiments, the device light may comprise (unconverted) light source light and converted light source light. The light source light may be converted into luminescent material light using a luminescent material and / or into upconverted light using an upconverter (see also below). The term "light generating device" may also refer to a plurality of light generating devices that may provide device light having substantially the same spectral power distribution. In specific embodiments, the term "light generating device" may also refer to a plurality of light generating devices that may provide device light having different spectral power distributions.

[0012] The term "light source" can refer to any light source known in the art in principle. 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 specific 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 refer to a plurality of light sources, such as 2 to 2000 (solid-state) LED light sources. Therefore, the term LED can also refer to a plurality of LEDs. In addition, the term "light source" can also refer to a so-called chip on board (COB) light source in an embodiment. The term "COB" particularly refers to an LED chip in the form of a semiconductor chip, which is neither enclosed nor connected, but directly mounted on a substrate (such as a PCB). Therefore, a plurality of light-emitting semiconductor light sources can be configured on the same substrate. In an embodiment, COB is a multi-LED chip configured together as a single lighting module.

[0013] The term "light source" may also refer to a chip scale package (CSP). A CSP may include a single solid-state die on which a layer including a luminescent material is provided. The term "light source" may also refer to a medium power package. A medium power package may include one or more solid-state dies. (Multiple) dies may be covered by a layer including a luminescent material. The die size may be equal to or less than 2 mm, such as in the range of, for example, 0.2 to 2 mm. Therefore, in an embodiment, the light source includes a solid-state light source. In addition, in a specific embodiment, the light source includes a chip scale packaged LED. In this document, the term "light source" may 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 may include one or more of a mini LED and a micro LED. In particular, in an embodiment, the light source includes a micro LED or a "micro LED" or a "μLED". In this document, the term mini size or mini LED particularly indicates a solid-state light source having a size selected from the range of 100 μm to 1 mm (such as a die size, in particular a length and a width). In this context, the term μ-size or micro-LED particularly denotes a solid-state light source having dimensions, such as die dimensions, particularly length and width, selected from the range of 100 μm and smaller.

[0014] The light source may have a light escape surface. In relation to a conventional light source, such as a light bulb or a fluorescent lamp, the escape surface may be the outer surface of a glass or quartz envelope. For an LED (which may be an LED die), or when a resin is applied to an LED die, the light escape surface is the outer surface of the resin. In principle, it may also be the terminal end of an optical fiber. The term escape surface refers in particular to the part of the light source from which the light of the light source actually leaves or escapes. The light source is configured to provide a light beam. The light beam (therefore) escapes from the light exit surface of the light source.

[0015] Likewise, the light generating device may comprise a light escaping surface such as an end window. Furthermore, also, the light generating system may comprise a light escaping surface such as an end window.

[0016] The term "light source" may refer to a semiconductor light emitting device, such as a light emitting diode (LED), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSEL), an edge emitting laser, etc. The term "light source" may also refer to an organic light emitting diode (OLED), such as a passive matrix (PMOLED) or an active matrix (AMOLED). In a specific embodiment, the light source includes a solid-state light source (such as an LED or a laser diode). In an embodiment, the light source includes an LED (light emitting diode). The term "light source" or "solid-state light source" may also refer to a superluminescent diode (SLED).

[0017] The term LED may also refer to a plurality of LEDs.

[0018] The term "light source" may also refer to a plurality of (substantially identical (or different)) light sources, such as 2 to 2000 solid-state light sources. In an embodiment, the light source may comprise one or more micro-optical elements (micro-lens arrays) located downstream of a single solid-state light source (such as an LED) or downstream of a plurality of solid-state light sources (i.e., for example shared by a plurality of LEDs). In an embodiment, the light source may comprise an LED with on-chip optics. In an embodiment, the light source comprises a pixelated single LED (with or without optics) (on-chip beam steering is provided in an embodiment).

[0019] In an embodiment, the light source may be configured to provide a primary radiation that is used such as, for example, a blue light source (e.g., a blue LED) or a green light source (e.g., a green LED) and a red light source (e.g., a red LED). Such LEDs that may not include a luminescent material ("phosphor") may be indicated as direct color LEDs.

[0020] However, in other embodiments, the light source may be configured to provide primary radiation, and part of the primary radiation is converted into secondary radiation. The secondary radiation may be based on the conversion performed by the luminescent material. Therefore, the secondary radiation may also be indicated as luminescent material radiation. In an embodiment, the light source may include a luminescent material (such as an LED having a luminescent material layer or having a dome including a luminescent material). Such an LED may be indicated as a phosphor conversion LED or a PC LED (phosphor conversion LED). In other embodiments, the luminescent material may be configured at a distance ("remote") from the light source (such as an LED having a luminescent material layer that is not in physical contact with the LED die). Therefore, in a specific embodiment, the light source may be a light source that emits at least light of a wavelength selected from the range of 380nm to 470nm during operation. However, other wavelengths may also be possible. This light may be used in part by the luminescent material.

[0021] In an embodiment, the light generating device may include a luminescent material. In an embodiment, the light generating device may include a PCLED. In other embodiments, the light generating device may include a direct LED (i.e., without a phosphor). In an embodiment, the light generating device may include a laser device (such as a laser diode). In an embodiment, the light generating device may include a superluminescent diode. Thus, in a specific embodiment, the light source may be selected from the group of laser diodes and superluminescent diodes. In other embodiments, the light source may include an LED.

[0022] The light source may in particular be configured to generate a source light having an optical axis (O), (beam shape) and a spectral power distribution. In an embodiment, the source light may comprise one or more bands, having a bandwidth known for the laser.

[0023] The term "light source" may (thus) refer to such a light generating element (such as, for example, a solid-state light source) or, for example, to a packaging of a light generating element (such as a solid-state light source) and one or more of a luminescent material, including elements and (other) optics (such as lenses, collimators). A light converter element ("converter element" or "converter") may include a luminescent material, which includes an element. 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 converter element optically coupled to the solid-state light source (such as a blue LED and a light converter element) may also be a light source (but may also be indicated as a light generating device). Thus, a white LED is a light source (but may also be indicated as, for example, a (white) light generating device).

[0024] The term "light source" herein may also refer to light sources including solid state light sources, such as LEDs or laser diodes or super luminescent diodes.

[0025] In embodiments, the term "light source" may (therefore) also refer to a light source that is (also) based on light conversion, such as a light source in combination with a luminescent converter material. Thus, the term "light source" may also refer to a combination of an LED and a luminescent material configured to convert at least part of the LED radiation, or to a combination of a (diode) laser and a luminescent material configured to convert at least part of the (diode) laser radiation.

[0026] In embodiments, the term "light source" may also refer to a combination of a light source (e.g., an LED) and an optical filter, which may change the spectral power distribution of the light generated by the light source. In particular, the term "light generating device" may be used to address the light source and other (optical components) (e.g., optical filters and / or beam shaping elements, etc.).

[0027] The phrase "different light sources" or "multiple different light sources" and similar phrases may refer to multiple solid-state light sources selected from at least two different bins in embodiments. Similarly, the phrase "same light source" or "multiple same light sources" and similar phrases may refer to multiple solid-state light sources selected from the same bin in embodiments.

[0028] The terms "solid-state light source" or "solid-state material light source" and similar terms may particularly refer to semiconductor light sources such as light emitting diodes (LEDs), diode lasers or superluminescent diodes.

[0029] The term "laser light source" particularly refers to a laser. Such a laser may particularly be configured to generate laser light source light having one or more wavelengths in the UV, visible or infrared, particularly having a wavelength selected from the spectral wavelength range of 200 nm to 2000 nm, such as 300 nm to 1500 nm. The term "laser" particularly refers to a device that emits light by an optical amplification process based on stimulated emission of electromagnetic radiation.

[0030] In particular, in embodiments, the term "laser" may refer to a solid-state laser. In specific embodiments, the term "laser" or "laser light source" or similar terms refers to a laser diode (or diode laser).

[0031] Thus, in an embodiment, the light source comprises a laser light source. In an embodiment, the term "laser" or "solid-state laser" or "solid-state material laser" may refer to cerium-doped lithium strontium (or calcium) aluminum fluoride (Ce:LiSAF, Ce:LiCAF), chromium-doped chrysoberyl (alexandrite) laser, chromium ZnSe (Cr:ZnSe) laser, divalent samarium-doped calcium fluoride (Sm:CaF 2 ) lasers, Er:YAG lasers, erbium-doped and erbium-ytterbium co-doped glass lasers, F-center lasers, holmium YAG (Ho:YAG) lasers, Nd:YAG lasers, NdCrYAG lasers, neodymium-doped yttrium calcium oxyborate Nd:YCa 4 O(BO 3 ) 3 or Nd:YCOB, Nd:YVO 4 ) lasers, neodymium glass (Nd: glass) lasers, neodymium YLF (Nd:YLF) solid-state lasers, promethium 147-doped phosphate glass (147Pm 3+ : Glass) solid-state laser, ruby ​​laser (Al 2 O 3 :Cr 3+ ), Thulium YAG (Tm:YAG) laser, Titanium Sapphire (Ti: Sapphire; Al 2 O 3 :Ti 3+ ) lasers, calcium fluoride doped with trivalent uranium (U:CaF 2 ) solid-state lasers, ytterbium-doped glass lasers (rods, plates / chips, and fibers), ytterbium YAG (Yb:YAG) lasers, Yb 2 O 3 (glass or ceramic) laser, etc.

[0032] For example, including second harmonic generation embodiments and third harmonic generation embodiments, the light source may include a F-centered laser, a Yttrium orthovanadate (Nd:YVO4 ) laser, phosphate glass doped with promethium 147 (147Pm 3+ : glass) and titanium sapphire (Ti: sapphire; Al 2 O 3 :Ti 3+ ) laser. For example, taking into account second harmonic generation and third harmonic generation, such a light source can be used to generate blue light.

[0033] In an embodiment, the term "laser" or "solid-state laser" or "solid-state material laser" may refer to one or more of semiconductor laser diodes (such as GaN, InGaN, AlGaInP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc.).

[0034] Lasers can be combined with upconverters to achieve shorter (laser) wavelengths. For example, upconversion can be obtained using some (trivalent) rare earth ions, or upconversion can be obtained using nonlinear crystals. Alternatively, lasers can be combined with downconverters (such as dye lasers) to achieve longer (laser) wavelengths.

[0035] It can be derived from the following that the term "laser light source" may also refer to a plurality of (different or identical) laser light sources. In a specific embodiment, the term "laser light source" may refer to a plurality of (N) (identical) laser light sources. In an embodiment, N=2 or more. In a specific embodiment, N may be at least 5, such as in particular at least 8. In this way, a higher brightness can be obtained. In an embodiment, the laser light sources may be arranged in a laser group (see also above). In an embodiment, the laser group may include a heat sink and / or optical devices, such as a lens for collimating the laser. Therefore, in an embodiment, the lasers in the laser group may share the same optical devices.

[0036] The laser light source is configured to generate laser light source light (or "laser"). The light source light may essentially consist of laser light source light. The light source light may also comprise laser light source light of two or more (different or identical) laser light sources. For example, laser light source light of two or more (different or identical) laser light sources may be coupled into a light guide to provide a single light beam comprising laser light source light of two or more (different or identical) laser light sources. In a specific embodiment, the light source light is therefore in particular collimated light source light. In another embodiment, however, the light source light is in particular (collimated) laser light source light.

[0037] In an embodiment, the laser light source light may comprise one or more bands having a bandwidth known to the laser. In a specific embodiment, the band may be a relatively sharp line, such as having a full width at half maximum (FWHM) in a range of less than 20 nm (such as equal to or less than 10 nm) at RT. Thus, the light source light has a spectral power distribution (intensity on an energy scale as a function of wavelength) that may comprise one or more (narrow) bands.

[0038] The beam (of the light source light) may be a focused or collimated beam of the (laser) light source light. The term "focused" may particularly refer to converging to a small spot. This small spot may be located at the discrete converter region, or (slightly) upstream thereof or (slightly) downstream thereof. In particular, the focusing and / or collimation may be such that the cross-sectional shape (perpendicular to the optical axis) of the beam at the discrete converter region (side) is substantially not larger than the cross-sectional shape (perpendicular to the optical axis) of the discrete converter region (where the light source light irradiates the discrete converter region). Focusing may be performed with one or more optical devices such as (focusing) lenses. In particular, two lenses may be applied to focus the laser light source light. Collimation may be performed with one or more (other) optical devices such as collimating elements (such as lenses and / or parabolic reflectors). In an embodiment, the (laser) light source beam may be relatively highly collimated (such as ≤2° (FWHM), more particularly ≤1° (FWHM), most particularly ≤0.5° (FWHM) in an embodiment). Hence, ≤ 2° (FWHM) can be regarded as (highly) collimated source light.Optical devices can be used to provide (high) collimation (see also above).

[0039] The term "solid-state material laser" and similar terms may refer to solid-state lasers based on crystal or glass doped with ions (such as transition metal ions and / or lanthanide ions), fiber lasers, photonic crystal lasers, semiconductor lasers such as, for example, vertical cavity surface emitting lasers (VCSELs), and the like.

[0040] The term "solid-state light source" and similar terms may particularly denote a semiconductor light source, such as a light emitting diode (LED), a diode laser or a superluminescent diode.

[0041] The term “semiconductor light source” may also be applied instead of the term “solid-state light source.” Thus, the term “semiconductor-based light source” may, for example, refer to one or more of a light emitting diode (LED), a diode laser, and a superluminescent diode.

[0042] Thus, the light generating device may include one or more of a light emitting diode (LED), a diode laser, and a super luminescent diode.

[0043] As indicated above, in an embodiment, the first light generating device may include a first laser light source (such as a diode laser). In an embodiment, the first light generating device may also include a plurality of first laser light sources. In particular, the first light generating device is configured to generate a first device light, wherein the first device light has a first device light peak wavelength (λ 1 ) and has a first spectral power distribution. By the term "spectral power distribution", in this document, in particular, refers to the spectral power distribution in the visible wavelength range (see also further below). In a specific embodiment, the first device light may essentially consist of laser light. In an embodiment, the first device light peak wavelength (λ) may be selected from a wavelength range of 425 nm to 465 nm. 1 In particular, the first device light peak wavelength (λ) may be selected from a wavelength range of 430 nm to 460 nm (more particularly 433 nm to 457 nm) (such as from a wavelength range of 435 nm to 455 nm in an embodiment). 1 ). Although the centroid wavelength may not have substantially the same value, the centroid wavelength may also be found in about this wavelength (such as 425nm to 465nm+ / -5nm) (such as selected from a wavelength range of 435 to 455nm+ / -5nm).

[0044] Furthermore, as indicated above, in an embodiment, the second light generating device may include a second laser light source (such as a diode laser). In an embodiment, the second light generating device may also include a plurality of second laser light sources. In particular, the second light generating device is configured to generate a second device light having a second device light peak wavelength (λ 2 ) and has a second spectral power distribution. In particular, the second spectral power distribution may be different from the first spectral power distribution. In a specific embodiment, the second device light may consist essentially of laser light. In an embodiment, the second device light peak wavelength (λ) may be selected from a wavelength range of 460 nm to 490 nm (in particular, 470 nm to 490 nm). 2 ), where λ 1 <λ 2 In an embodiment, the second device light peak wavelength (λ) may be selected from a wavelength range of 472 nm to 487 nm (more particularly 474 nm to 485 nm), such as from a wavelength range of 475 nm to 483 nm in an embodiment. 2). Although the centroid wavelength may not have substantially the same value, the centroid wavelength may also be found in about this wavelength (such as 470 nm to 490 nm + / - 5 nm) (such as selected from a wavelength range of 475 nm to 483 nm + / - 5 nm). In particular, due to the (controllable) contribution of the second device light to the system light, in particular at relatively high CCTs etc., the color point may be kept relatively close to the blackbody locus.

[0045] In particular, 2 -λ 1 ≥10nm, more particularly, λ 2 -λ 1 ≥15nm. Therefore, in an embodiment, the first light generating device and the second light generating device may be from different bins (although other options may also be possible when different lasers are selected, see also above). In an embodiment, the spectral power distribution overlap of the first device light and the second device light is less than 25% (i.e., the first spectral power distribution is overlapped by the second spectral power distribution by less than 25%, and the second spectral power distribution is overlapped by the first spectral power distribution by less than 25%), such as a maximum of 15%. More particularly, the spectral power distribution of the first device light and the second device light may overlap by less than 10%, such as less than 5%. Since the first light generating device and the second light generating device may include lasers, and the first device light and the second device light may consist essentially of lasers (with different spectral power distributions), the spectral overlap may even be essentially zero.

[0046] In a specific embodiment, the first device light peak wavelength (λ) may be selected from a wavelength range of 430 nm to 460 nm. 1 ), and / or the second device light peak wavelength (λ) may be selected from the wavelength range of 475 nm to 485 nm. 2 In a specific embodiment, 2 -λ 1 In addition, in a specific embodiment, the first centroid wavelength can be selected from a wavelength range of 430 nm to 460 nm + / - 5 nm, and / or the second centroid wavelength can be selected from a wavelength range of 475 nm to 485 nm + / - 5 nm, and the centroid wavelengths are particularly different by at least about 15 nm (such as at least about 20 nm).

[0047] The term "centroid wavelength" (also indicated as λ) is known in the art. C ), and it refers to the wavelength value at which half of the light energy is at the shorter wavelength and half of the energy is at the longer wavelength; the value is specified in nanometers (nm). It is the wavelength that divides the integral of the spectral power distribution into two equal parts, as shown in the formula λ C=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 integrated intensity). The centroid wavelength can be determined, for example, under operating conditions.

[0048] In particular, in an embodiment in the blue wavelength range of 440 nm to 490 nm, there are only two (narrow) emission bands, one provided by the first device light, in particular with a first device light peak wavelength (λ) selected from the wavelength range of 430 nm to 460 nm. 1 ), and the other is provided by a second device light, in particular having a second device light peak wavelength (λ) selected from the wavelength range of 475 nm to 485 nm 2 ). Therefore, in a specific embodiment, there is no available third emission band in the range of about 460 to 475. Therefore, in particular at the first device light peak wavelength (λ 1 ) and the peak wavelength of the second device light (λ 2 ) there may be no third peak (or its maximum value is less than 5% of the maximum value of the first device peak or the second device peak).

[0049] In the following, some general aspects related to (general) luminescent materials are first discussed.

[0050] The term "luminescent material" refers in particular to a material which can convert a first radiation, in particular one or more of UV radiation and blue radiation, into a second radiation. Generally, the first radiation and the second radiation have different spectral power distributions. Therefore, the term "luminescent converter" or "converter" may also be applied instead of the term "luminescent material". Generally, the second radiation has a spectral power distribution at a larger wavelength than the first radiation, which is the case in so-called down-conversion. However, in a specific embodiment, the second radiation has an intensity of the spectral power distribution at a smaller wavelength than the first radiation, which is the case in so-called up-conversion.

[0051] In an embodiment, a "luminescent material" may particularly refer to a material that can convert radiation into, for example, visible and / or infrared light. For example, in an embodiment, the luminescent material may be able to convert one or more of UV radiation and blue radiation into visible light. In a specific embodiment, the luminescent material may also convert radiation into infrared radiation (IR). Thus, upon excitation with 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 with a larger wavelength (λ). ex <λ em ), but in a specific embodiment, the luminescent material may include an up-converter luminescent material, that is, radiation of a larger wavelength is converted into radiation with a smaller wavelength (λ ex>λ em ).

[0052] In an embodiment, the term "luminescence" may refer to phosphorescence. In an embodiment, the term "luminescence" may also refer to fluorescence. The term "emission" may also be applied instead of the term "luminescence". Thus, the terms "first radiation" and "second radiation" may refer to excitation radiation and emission (radiation), respectively. Similarly, the term "luminescent material" may refer to phosphorescence and / or fluorescence in an embodiment.

[0053] The term "luminescent material" may also refer to a variety of different luminescent materials. Examples of possible luminescent materials are indicated below. Therefore, in a specific embodiment, the term "luminescent material" may also refer to a luminescent material composition. The term "phosphor" may also be applied instead of the term "luminescent material". These terms are known to those skilled in the art.

[0054] In an embodiment, the luminescent material is selected from garnets and nitrides, in particular doped with trivalent cerium or divalent europium, respectively. The term "nitride" may also refer to nitrogen oxides or nitrogen silicates, etc. Alternatively or additionally, the luminescent material may be selected from silicates, in particular doped with divalent europium.

[0055] In a specific embodiment, the luminescent material comprises type A 3 B 5 O 12 : Ce, wherein in an embodiment A comprises one or more of Y, La, Gd, Tb and Lu, in particular (at least) one or more of Y, Gd, Tb and Lu, and wherein in an embodiment B comprises one or more of Al, Ga, In and Sc. In particular, A may comprise one or more of Y, Gd and Lu (such as in particular one or more of Y and Lu). In particular, B may comprise one or more of Al and Ga, more particularly at least Al (such as substantially entirely Al). Therefore, in particular, a suitable luminescent material is a garnet material comprising a cerium material. Embodiments of garnet in particular comprise A 3 B 5 O 12Garnet, wherein A comprises at least yttrium or lutetium, and wherein B comprises at least aluminum. Such garnet may be doped with cerium (Ce), praseodymium (Pr) or a combination of cerium and praseodymium; however, in particular with Ce. In particular, B may comprise aluminum (Al); however, in addition to aluminum, B may also partially comprise gallium (Ga) and / or scandium (Sc) and / or indium (In), in particular up to about 20% B, more in particular up to about 10% B (i.e., the B ions consist essentially of 90 or more mol % Al and 10 or less mol % of one or more of Ga, Sc and In); B may in particular comprise up to about 10% gallium. In another variant, B and O may be at least partially replaced by Si and N. The element A may in particular be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu). Furthermore, Gd and / or Tb are present in amounts specifically only up to about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Y 1-x Lu x ) 3 B 5 O 12 :Ce, wherein x is equal to or greater than 0 and equal to or less than 1. The term ":Ce" indicates that part of the metal ions in the luminescent material (i.e., in garnet: part of the "A" ions) are replaced by Ce. 1-x Lu x ) 3 Al 5 O 12 In the case of Ce, part of Y and / or Lu is replaced by Ce. This is known to those skilled in the art. Ce will replace generally no more than 10% of A; typically, the Ce concentration will be in the range of 0.1% to 4%, in particular 0.1% to 2% (relative to A). Assuming 1% Ce and 10% Y, a completely correct molecular formula might be (Y 0.1 Lu 0.89 Ce 0.01 ) 3 Al 5 O 12 As known to those skilled in the art, Ce in garnet is substantially or exclusively in the trivalent state.

[0056] In an embodiment, the luminescent material (therefore) comprises A 3 B 5 O 12 , wherein in a specific embodiment up to 10% of the BO can be replaced by Si-N.

[0057] In a specific embodiment, the luminescent material includes (Y x1 A' x2 Ce x3 ) 3 (Aly1 B’ y2 ) 5 O 12 , where x1 + x2 + x3 = 1, where x3 > 0, where 0 < x2 + x3 ≤ 0.2, where y1 + y2 = 1, where 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 in the range from 0.001 to 0.1. In the present invention, in particular x1 > 0 (such as > 0.2, e.g., at least 0.8). The garnet having Y can provide a suitable spectral power distribution.

[0058] In a specific embodiment, up to 10% of 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 specific embodiment, B-O can refer to Al-O. As indicated above, in a specific embodiment, x3 can be selected in the range from 0.001 to 0.04. In particular, such a luminescent material can have a suitable spectral distribution (however, see below), have a relatively high efficiency, have a relatively high thermal stability, and allow a high CRI (optionally in combination with the light of other light sources described herein). Thus, in a specific 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 ) 5 O 12 , where Lu and / or Gd can be available. Even more particularly, x3 is selected in the range from 0.001 to 0.1, where 0 < x2 + x3 ≤ 0.1, and where 0 ≤ y2 ≤ 0.1. Further, in a specific embodiment, up to 1% of B-O can be replaced by Si-N. Here, the percentage refers to moles (as known in the art); also see, for example, EP3149108. However, in another specific embodiment, the luminescent material comprises (Y x1-x3 Ce x3 ) 3 Al 5 O 12 , where x1 + x3 = 1, and where 0 < x3 ≤ 0.2 (such as 0.001 to 0.1).

[0059] In a specific embodiment, the light generating device may include only a luminescent material, and the luminescent material is selected from the type of garnet including cerium. In yet another specific 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 ) 5 O 12 ). Thus, in a specific embodiment, 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 includes (Y x1 A’ x2 Ce x3 ) 3 (Al y1 B’ y2 ) 5 O 12 . Here, A’ includes one or more elements selected from the group consisting of lanthanide elements, and B’ includes one or more elements selected from the group consisting of 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 to 0.1. Note that in the embodiment, x2 = 0. Alternatively or additionally, in the embodiment, y2 = 0.

[0060] In a specific embodiment, A may particularly include at least Y, and B may particularly include at least Al.

[0061] Alternatively or additionally, the luminescent material may include a luminescent material of type A 3 Si 6 N 11 :Ce 3+ , where A includes one or more of Y, La, Gd, Tb, and Lu (such as one or more of La and Y in the embodiment).

[0062] In the embodiment, the luminescent material may alternatively or additionally include MS:Eu 2+ and / or M 2 Si 5 N 8 :Eu 2+ and / or MAlSiN 3 :Eu 2+ and / or Ca 2 AlSi 3 O 2 N5 :Eu 2+ One or more of the above, wherein M comprises one or more of Ba, Sr and Ca, and in particular at least Sr in the embodiment. Therefore, in the embodiment, the light emission may include the light emission from (Ba, Sr, Ca)S:Eu, (Ba, Sr, Ca)AlSiN 3 :Eu and / or (Ba, Sr, Ca) 2 Si 5 N 8 :Eu. In these compounds, europium (Eu) is substantially or exclusively divalent and replaces one or more of the indicated divalent cations. Generally, Eu is present in an amount not greater than 10% of the cations; its presence is particularly in the range of about 0.5% to 10%, more particularly in the range of about 0.5% to 5%, relative to the cations it replaces. The term ":Eu" indicates that part of the metal ion is replaced by Eu (in these examples by Eu). 2+ For example, assuming CaAlSiN 3 :Eu contains 2% Eu, so the correct molecular formula may be (Ca 0.98 Eu 0.02 )AlSiN 3 . Divalent europium will generally replace divalent cations (such as the above divalent alkaline earth cations, in particular Ca, Sr or Ba). The material (Ba,Sr,Ca)S:Eu may also be indicated as MS:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); in particular, in the compound M includes calcium or strontium, or calcium and strontium, more particularly calcium. Here, Eu is introduced and replaces at least part of M (i.e., one or more of Ba, Sr and Ca). In addition, the material (Ba,Sr,Ca) 2 Si 5 N 8 :Eu can also be indicated as M 2 Si 5 N 8 :Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); in particular, in the compound, M includes Sr and / or Ba. In another specific embodiment, M consists of Sr and / or Ba (ignoring the presence of Eu), in particular 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 Si 5 N 8:Eu (i.e., 75% Ba; 25% Sr). Here, Eu is introduced and replaces at least part of M (i.e., one or more of Ba, Sr and Ca). Similarly, the material (Ba, Sr, Ca)AlSiN 3 :Eu can also be indicated as MAlSiN 3 :Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); in particular, in the compound, M includes calcium or strontium, or calcium and strontium, more particularly calcium. Here, Eu is introduced and replaces at least part of M (i.e., one or more of Ba, Sr and Ca). As known to those skilled in the art, Eu in the luminescent material indicated above is substantially or only in a divalent state.

[0063] In an embodiment, the red light emitting material may include (Ba, Sr, Ca)S:Eu, (Ba, Sr, Ca)AlSiN 3 :Eu and (Ba, Sr, Ca) 2 Si 5 N 8 :Eu. In these compounds, europium (Eu) is substantially or exclusively divalent and replaces one or more of the indicated divalent cations. Typically, Eu is present in an amount not greater than 10% of the cations; it is present in an amount specifically in the range of about 0.5% to 10%, more specifically in the range of about 0.5% to 5%, relative to the cations it replaces. The term ":Eu" indicates that part of the metal ion is replaced by Eu (in these examples by Eu 2+ For example, assuming CaAlSiN 3 :Eu contains 2% Eu, so the correct molecular formula may be (Ca 0.98 Eu 0.02 )AlSiN 3 The divalent europium will generally replace a divalent cation, such as the above divalent alkaline earth cations, in particular Ca, Sr or Ba.

[0064] The material (Ba, Sr, Ca) S: Eu may also be indicated as MS: Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); in particular, in the compound, M includes calcium or strontium, or calcium and strontium, more particularly calcium. Here, Eu is introduced and replaces at least part of M (i.e., one or more of Ba, Sr and Ca).

[0065] In addition, materials (Ba, Sr, Ca) 2 Si 5 N 8 :Eu can also be indicated as M2 Si 5 N 8 :Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); in particular, in the compound, M includes Sr and / or Ba. In another specific embodiment, M consists of Sr and / or Ba (ignoring the presence of Eu), in particular 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 Si 5 N 8 :Eu (ie, 75% Ba; 25% Sr). Here, Eu is introduced and replaces at least part of M (ie, one or more of Ba, Sr and Ca).

[0066] Similarly, the material (Ba, Sr, Ca)AlSiN 3 :Eu can also be indicated as MAlSiN 3 :Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); in particular, in the compound, M includes calcium or strontium, or calcium and strontium, more particularly calcium. Here, Eu is introduced and replaces at least part of M (i.e., one or more of Ba, Sr and Ca).

[0067] As known to the person skilled in the art, Eu in the above indicated luminescent materials is substantially or exclusively in the divalent state.

[0068] The blue light emitting material may include YSO (Y 2 SiO 5 :Ce 3+ ) or similar compounds or BAM (BaMgAl 10 O 17 :Eu 2 + ) or similar compounds.

[0069] The term "luminescent material" herein particularly relates to inorganic luminescent materials.

[0070] Alternatively or additionally, other luminescent materials may also be applied. For example, quantum dots and / or organic dyes may be applied and may optionally be embedded in a transmissive matrix, such as a polymer (eg PMMA or polysiloxane, etc.).

[0071] Quantum dots are small crystals of semiconductor material, usually with a width or diameter of only a few nanometers. When excited by incident light, the quantum dots emit light of a color determined by the size and material of the crystal. Light of a specific color can therefore be produced by adapting the size of the dots. Most known quantum dots with emission in the visible range are based on cadmium selenide (CdSe) with a shell, such as cadmium sulfide (CdS) and zinc sulfide (ZnS). Cadmium-free quantum dots are also possible, such as indium phosphide (InP) and copper indium sulfide (CuInS 2 ) and / or silver indium sulfide (AgInS 2 )) is used. Quantum dots show very narrow emission bands, and therefore they show saturated colors. In addition, the emission color can be easily tuned by adapting the size of the quantum dots. Any type of quantum dots known in the art can be used in the present invention. However, for reasons of environmental safety and concern, it may be preferred to use cadmium-free quantum dots or at least quantum dots with a very low cadmium content.

[0072] Instead of or in addition to quantum dots, other quantum confinement structures may also 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.

[0073] Organic phosphors may also be used. Examples of suitable organic phosphor materials are organic luminescent materials based on perylene derivatives, such as those marketed by BASF under the name Examples of suitable compounds include, but are not limited to Red F305, Orange F240, Yellow F083 and F 170.

[0074] Different luminescent materials may have different spectral power distributions of the respective luminescent material light. Alternatively or additionally, such different luminescent materials may in particular have different color points (or dominant wavelengths).

[0075] As indicated above, other luminescent materials may also be possible. Thus, in a specific embodiment, the luminescent material is selected from the group of a nitride comprising divalent europium, an oxynitride comprising divalent europium, a silicate comprising divalent europium, a garnet comprising cerium, and a quantum structure. The quantum structure may, for example, comprise a quantum dot or a quantum rod (or other quantum type particle) (see above). The quantum structure may also comprise a quantum well. The quantum structure may also comprise a photonic crystal.

[0076] As indicated above, in an embodiment the first luminescent material is arranged in a light receiving relationship with the first light generating device.Thus, the first luminescent material may be arranged downstream of the first light generating device.

[0077] The term "light-receiving relationship" or "light receiving relationship" and similar terms may indicate that an item may receive light from a light source (such as a light generating device or a light generating element or a light generating system) during operation of the light source. Therefore, the item may be arranged downstream of the light source. Between the light source and the item, an optical device may be arranged. The terms "upstream" and "downstream" may particularly relate to the arrangement of items or features relative to the propagation of light from a light generating element (here particularly a first light generating device), such as in the context of light propagation, wherein relative to a first position in a light beam from the light generating element, a second position in the light beam that is closer to the light generating element (compared to the first position) is "upstream", and a third position in the light beam that is farther away from the light generating element (compared to the first position) is "downstream". For example, the term "light generating mode" may also be applied instead of the term "light generating element".

[0078] Furthermore, the first luminescent material is configured to convert at least part of the first device light (received from the first light generating device) into the first luminescent material light. In particular, when excited by the first device light, the spectral power distribution of the first luminescent material may show an intensity at least in the green-yellow wavelength range. Thus, the first luminescent material light may have an intensity in the wavelength range of 490nm to 590nm. More particularly, the first luminescent material light may have a luminescent material emission centroid wavelength (λ ) in the green-yellow wavelength range. c,1 ) (i.e. within the wavelength range of 490nm to 590nm).

[0079] The terms "violet light" or "violet light emission" and similar terms may particularly relate to light having a wavelength in the range of about 380nm to 440nm. In a specific embodiment, the violet light may have a centroid wavelength in the range of 380nm to 440nm. The terms "blue light" or "blue light emission" and similar terms may particularly relate to light having a wavelength in the range of about 440nm to 490nm (including some violet and cyan hues). In a specific embodiment, the blue light may have a centroid wavelength in the range of 440nm to 490nm. The terms "green light" or "green light emission" and similar terms may particularly relate to light having a wavelength in the range of about 490nm to 560nm. In a specific embodiment, the green light may have a centroid wavelength in the range of 490nm to 560nm. The terms "yellow light" or "yellow light emission" and similar terms may particularly relate to light having a wavelength in the range of about 560nm to 590nm. In a specific embodiment, yellow light may have a centroid wavelength in the range of 560nm to 590nm. The terms "orange light" or "orange light emission" and similar terms may particularly relate to light having a wavelength in the range of about 590nm to 620nm. In a specific embodiment, orange light may have a centroid wavelength in the range of 590nm to 620nm. The terms "red light" or "red light emission" and similar terms may particularly relate to light having a wavelength in the range of about 620nm to 750nm. In a specific embodiment, red light may have a centroid wavelength in the range of 620nm to 750nm. The terms "cyan light" or "cyan light emission" and similar terms may particularly relate to light having a wavelength in the range of about 490nm to 520nm. In a specific embodiment, cyan light may have a centroid wavelength in the range of 490nm to 520nm. The terms "amber light" or "amber light emission" and similar terms may specifically relate to light having a wavelength in the range of about 585nm to 605nm, such as about 590nm to 600nm. In a specific embodiment, the amber light may have a centroid wavelength in the range of 585nm to 605nm. The phrase "light having one or more wavelengths in the wavelength range" and similar phrases may specifically indicate that the indicated light (or radiation) has a spectral power distribution with at least one or more intensities at these one or more wavelengths in the indicated wavelength range. For example, a solid-state light source emitting blue light will have a spectral power distribution with intensities at one or more wavelengths in the wavelength range of 440nm to 495nm.

[0080] The terms "light" and "radiation" are used interchangeably herein, unless it is clear from the context that the term "light" refers only to visible light. Thus, the terms "light" and "radiation" may refer to UV radiation, visible light, and IR radiation. In specific embodiments, particularly for lighting applications, the terms "light" and "radiation" refer to (at least) visible light.

[0081] Thus, in an embodiment, the first luminescent material is configured in a light receiving relationship with the first light generating device and is configured to convert at least part of the first device light into first luminescent material light having a luminescent material emission centroid wavelength (λ) in the green-yellow wavelength range. c,1 ). However, in particular, the first luminescent material may not be configured to be in a light receiving relationship with the second light generating device. Thus, the first light generating device, the second light generating device and the first luminescent material (and optional optical devices) may be configured so that at least part of the first device light reaches the first luminescent material, while substantially no second device light reaches the first luminescent material.

[0082] Thus, in particular, the second device light may bypass the first luminescent material. In this way, the second device light may not be absorbed by the first luminescent material, whereas if such second device light reaches the first luminescent material, the first luminescent material may in principle absorb at least part of the second device light. Thus, the first luminescent material may be able to absorb (and convert) at least part of the first device light, and the first luminescent material may also be able to absorb (and convert) at least part of the second device light, but may be configured such that substantially no second device light reaches the first luminescent material.

[0083] When light does not irradiate (in transmission or reflection mode) the luminescent material, the light may bypass the luminescent material. When light bypasses the luminescent material, it is also not converted by the luminescent material. Thus, in an embodiment, the second device light is not (substantially) converted by the first luminescent material (because the second device light may bypass the first luminescent material).

[0084] As indicated above, the light generating system can be configured to generate system light, the system light including one or more of the first device light, the second device light, and the first luminescent material light. In a specific embodiment, in an operating mode of the system, the system light can include all of the first device light, the second device light, and the first luminescent material light.

[0085] In an embodiment, the light generating system may be configured to generate visible light (in one or more operating modes of the light generating system). In a further specific embodiment, the light generating system may be configured to generate white light (in one or more operating modes of the light generating system).

[0086] 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 to 780nm. In the present invention, UV may particularly refer to a wavelength selected from the range of 190nm to 380nm, such as 200nm to 380nm. The term "white light" and similar terms herein are known to those skilled in the art. It may particularly refer to light having a correlated color temperature (CCT) between about 1800K and 20000K, such as between 2000K and 20000K, particularly 2700K to 20000K, typically lighting in the range of about 2000K to 7000K, such as in the range of 2700K and 6500K. In an embodiment, for example for the purpose of backlighting or other purposes, the correlated color temperature (CCT) may particularly be in the range of about 7000K and 20000K. However further, in an embodiment, the correlated color temperature (CCT) is particularly within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), particularly within about 10 SDCM from the BBL, even more particularly within about 5 SDCM from the BBL. In a specific embodiment, the correlated color temperature (CCT) may be selected from the range of 6000K to 12000K (such as selected from the range of 7000K to 12000K) (such as at least 8000K). However further, in an embodiment, optionally in combination with a CRI of at least 70, the correlated color temperature (CCT) may be selected from the range of 6000K to 12000K (such as selected from the range of 7000K to 12000K).

[0087] In a specific embodiment, the system light may have a controllable correlated color temperature. In particular, the spectral power distribution of the system light may be controlled by controlling the first device light and the second device light. Thus, in an embodiment, the control system is configured to control the first light generating device and the second light generating device.

[0088] In particular, the control system may be configured to control the first light generating device and the second light generating device such that (a) in a first operating mode of the light generating system, the system light has a first correlated color temperature CCT1, wherein CCT1 ≥ 4000 K. This does not necessarily exclude an operating mode in which the first correlated color temperature is below 4000 K.

[0089] However, alternatively or additionally, the control system may be configured to control the first light generating device and the second light generating device such that (b) in a second operating mode of the light generating system, the system light has a second correlated color temperature (CCT2), wherein in an embodiment CCT2-CCT1≥500K, more particularly CCT2-CCT1≥1000K, or even a larger (minimum) difference. Again, this does not necessarily exclude operating modes wherein CCT2-CCT1≤500K or wherein CCT2-CCT1≤1000K.

[0090] However, alternatively or additionally, the control system may be configured to control the first light generating device and the second light generating device such that (c) in at least one of the operating modes, the system light has a correlated color temperature selected from the range of at least 6000K, more particularly at least 7000K. Again, this does not necessarily exclude operating modes in which both correlated color temperatures are below 7000K or below 6000K. Furthermore, this may also include embodiments comprising one or more operating modes in which one of the correlated color temperatures is below 6000K and the other is above 6000K, or one of the correlated color temperatures is below 7000K and the other is above 7000K, as indicated above, this particularly includes embodiments in which the CCT difference is at least 1000K. Furthermore, alternatively or additionally, the control system may be configured to control the first light generating device and the second light generating device such that (d) in both operating modes the system light has a color rendering index of at least 70. Again, this does not necessarily exclude operating modes in which the CRI of one or both of the first operating mode and the second operating mode is below 70.

[0091] In a particular embodiment, the CCT (of the white system light) may be controlled between a first value (CCT1) and a second value (CCT2), wherein |CCT2-CCT1|≥500K, more particularly |CCT2-CCT1|≥1000K. In a particular embodiment, |CCT2-CCT1|≥1500K, such as |CCT2-CCT1|≥1800K, such as more particularly |CCT2-CCT1|≥2000K. In particular, in an embodiment, |CCT2-CCT1|≥3000K, such as in the case where the correlated color temperature may be selected from the range of 7000K to 10000K. In an embodiment, the CRI over the entire 7000K to 10000K range may be at least 70, more particularly at least 80, such as at least 85. In another embodiment, the CRI may be at least 90 over the entire 7000K to 10000K range.

[0092] As indicated above, the system may include a control system, or may be functionally coupled to a control system. The term "control" and similar terms particularly refer to at least determining behavior or supervising the operation of an element. Therefore, "control" and similar terms herein may, for example, refer to applying behavior (determining behavior or supervising the operation of an element) to an element, such as, for example, measuring, displaying, actuating, opening, shifting, changing temperature, etc. In addition, the term "control" and similar terms may additionally include monitoring. Therefore, the term "control" and similar terms may include applying behavior to an element and applying behavior to an element and monitoring the element. The control of an element may be accomplished using a control system, which may also be indicated as a "controller". The control system and the element may therefore be functionally coupled at least temporarily or permanently. The element may include a control system. In an embodiment, the control system and the element may not be physically coupled. Control may be accomplished via wired and / or wireless control. The term "control system" may also refer to multiple generations of different control systems, which may be functionally coupled in particular, and, for example, one of these control systems may be a host control system, and one or more other control systems may be a slave control system. The control system may include a user interface or may be functionally coupled to a user interface.

[0093] The control system may also be configured to receive and execute instructions from a remote device. In an embodiment, the control system may be controlled via an application on a device, such as a portable device (e.g. a smartphone or iPhone, a tablet computer, etc.). Thus, the device does not have to be coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system.

[0094] Thus, in an embodiment, the control system may (also) be configured to be controlled by an application on a remote device. In such an embodiment, the control system of the lighting system may be a slave control system or controlled in slave mode. For example, the lighting system may be identified with a code, in particular a unique code of the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system which accesses the lighting system based on the knowledge of the (unique) code (input by a user interface with an optical sensor, such as a QR code reader). The lighting system may also comprise means for communicating with other systems or devices, such as based on Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX or another wireless technology.

[0095] A system or device or apparatus may perform actions in a "mode" or "operation mode" or "mode of operation" or "operational mode". The term "operational mode" may also be indicated as a "control mode". Similarly, in a method, actions or phases or steps may be performed in a "mode" or "operational mode" or "mode of operation" or "operational mode". This does not exclude that the system or device or apparatus may also be adapted to provide another control mode or a plurality of other control modes. Similarly, this may not exclude that before and / or after the execution of the mode, one or more other modes may be executed.

[0096] However, in an embodiment, a control system may be available, which is adapted to provide at least a control mode. If other modes are available, the selection of such a mode may in particular be performed via a user interface, although other options (such as executing a mode depending on a sensor signal or a (time) scheme) may also be possible. An operating mode may in an embodiment also refer to a system or device or apparatus that can only operate in a single operating mode (i.e., "on", without further tunability).

[0097] Thus, in an embodiment, the control system may be controlled depending 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 scheme.

[0098] When controlling CCT, particularly at relatively high correlated color temperatures, the color point may be maintained relatively close to the black body locus, such as within 10 SDCM, more particularly within 5 SDCM, or even within about 3 SDCM of the BBL.

[0099] The first luminescent material may be configured in a reflective mode or in a transmissive mode with respect to the first light generating device.

[0100] Furthermore, the system may comprise a first optical element configured to focus the first device light on at least a portion of the first luminescent material. Such a first optical element may comprise a lens. In an embodiment, the first optical element may comprise one or two lenses to focus the first device light on at least a portion of the first luminescent material. When a plurality of first light generating devices are applied, for example, a lens array may be applied. However, in (other) embodiments, the first optical element may also comprise a collimator. If a plurality of first light generating devices are applied in such an embodiment, for example, a collimator array may be applied. The body (such as, for example, a (micro) lens plate) may comprise such an array. For example, embodiments are also described in US2005 / 0270775, which is incorporated herein by reference.

[0101] Thus, in an embodiment, the first luminescent material is configured in a reflective mode; and the light generating system comprises a first optical element configured to focus the first device light on at least a portion of the first luminescent material. In an alternative embodiment, the first luminescent material is configured in a transmissive mode; and the light generating system comprises a first optical element configured to focus the first device light on at least a portion of the first luminescent material.

[0102] As indicated above, the (first) luminescent material can be configured to be in a reflection mode or a transmission mode. In the transmission mode, it can be relatively easy to mix the light source light in the luminescent material light, which can be useful for generating a desired spectral power distribution. In the reflection mode, heat management can be easier because a major portion of the luminescent material may be in thermal contact with a thermally conductive element (such as a heat sink or a heat spreader). In the reflection mode, in an embodiment, part of the light source light can be reflected by the luminescent material and / or the reflector and can be mixed in the luminescent material light. The reflector can be configured downstream of the luminescent material (in the reflection mode). In the reflection mode, a dichroic reflector can be used to promote the luminescent material light to exceed the device light. The former can be transmitted with a higher transmittance than the latter, and the latter can be reflected with a higher reflectivity than the former.

[0103] When the pump light can have a spectral power distribution that can be used to pump the luminescent material and mixed in the system light, several options can be selected. In an embodiment, multiple first light generating devices can be applied, one or more of which are used to pump the luminescent material, and one or more other first light generating devices are configured to provide a first device light that bypasses the luminescent material. Alternatively or additionally, one or more first light generating devices can be used to generate a first device light, part of which is directed to the light-emitting element and another part can be configured to bypass the light-emitting element. This can be done, for example, via a beam splitter. When the light does not irradiate the luminescent material (in transmission or reflection mode), the light can bypass the luminescent material.

[0104] Thus, part of the first device light also ends up in the system light, which may be useful. This can be achieved by one or more of the following: (i) only partial absorption (and thus partial reflection and / or transmission), and (ii) bypassing the first luminescent material with part of the first device light. Light that bypasses the (first) luminescent material or is not converted by the (first) luminescent material after reaching the (first) luminescent material may be indicated as "unconverted first device light" and similar terms.

[0105] Thus, in embodiments, the first light generating device and the first luminescent material may be configured such that a portion of the first device light is converted into luminescent material light. Thus, in specific embodiments, the system light may include (i) at least a portion of the unconverted first device light and (ii) the first luminescent material light. More particularly, in embodiments, the system light may include (i) at least a portion of the unconverted first device light, (ii) the second device light, and (iii) the first luminescent material light.

[0106] Thus, in (other) embodiments, the system may include one or more first light generating devices configured to generate first device light, wherein the one or more first light generating devices and optional optical devices are configured such that a portion of the first device light bypasses the first luminescent material. Thus, in specific embodiments, the system light may include (i) at least a portion of the unconverted first device light and (ii) the first luminescent material light. More particularly, in embodiments, the system light may include (i) at least a portion of the unconverted first device light, (ii) the second device light, and (iii) the first luminescent material light.

[0107] The bypass may be obtained by splitting the first device light beam into two or more beams, one beam propagating to the first luminescent material and the other beam bypassing the first luminescent material, and / or by using two or more first light generating devices, wherein the first device light of one first light generating device propagates to the first luminescent material and the first device light of another first light generating device bypasses the first luminescent material. The system includes a plurality of first light generating devices, wherein the plurality of first light generating devices include a primary first light generating device and a secondary first light generating device, wherein the first luminescent material is configured to be in a light receiving relationship with one of the primary first light generating device and the secondary first light generating device, and wherein the first luminescent material is not configured to be in a light receiving relationship with the other of the primary first light generating device and the secondary first light generating device.

[0108] In an embodiment, the first luminescent material may be configured to be in thermal contact with a heat conductor. In addition, in an embodiment, the luminescent body may include the first luminescent material. In a specific embodiment, the luminescent body may be configured to be in thermal contact with a heat conductor.

[0109] The heat conductor may include a heat conducting material. The heat conducting element may particularly include a heat conducting material. The heat conducting material may particularly have a thermal conductivity of at least about 20 W / (m*K), such as at least about 30 W / (m*K), such as at least about 100 W / (m*K), such as particularly at least about 200 W / (m*K). However, in other specific embodiments, the heat conducting material may particularly have a thermal conductivity of at least about 10 W / (m*K). In an embodiment, the heat conducting material may include one or more of copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, silicon carbide aluminum, beryllium oxide, silicon carbide composite material, silicon carbide aluminum, copper tungsten alloy, molybdenum carbide copper, carbon, diamond and graphite. Alternatively or additionally, the heat conducting material may include aluminum oxide or be composed of aluminum oxide.

[0110] The heat conductor may include a heat sink or a heat spreader. The heat conductor may include a two-phase cooling device. Heat sinks are known in the art. The term "heat sink" (or heat sink) may particularly be a passive heat exchanger, which transfers heat generated by a device (such as an electronic device or a mechanical device) to a fluid (cooling) medium (usually air or a liquid coolant). Therefore, heat is (at least partially) dissipated from the device. The heat sink is particularly designed to maximize its surface area in contact with the surrounding fluid cooling medium. Therefore, the heat sink may particularly include a plurality of fins. For example, the heat sink may be a body with a plurality of fins extending therefrom. The heat sink particularly includes (more particularly consists of) a thermally conductive material. The term "heat sink" may also refer to a plurality of (different) heat sinks. A heat spreader may be configured to transfer energy as heat from a first element to a second element. The second element may particularly be a heat sink or a heat exchanger. The heat spreader may be passive or active. Embodiments of passive heat expanders may include a material plate or block of material (such as copper, aluminum or diamond) with high thermal conductivity. Active heat expanders may be configured to accelerate heat transfer by consuming energy as work supplied by an external source. In this article, the heat expander may be a passive heat expander in particular. Alternatively or additionally, the heat expander may be an active heat expander, such as selected from a group of heat pipes and steam chambers. The heat expander particularly includes a heat conductive material (more particularly composed of a heat conductive material). The term "heat expander" may also refer to a plurality of (different) heat expanders. A two-phase cooling device may be a device that transfers heat between two locations based on both thermal conductivity and phase change. In particular, a liquid such as water (e.g., for copper devices) or acetone (e.g., for aluminum devices) may be added to the two-phase cooling device, and the two-phase cooling device may be vacuum sealed. When heat is applied to an area of ​​the two-phase cooling device, the liquid may become vapor and move to an area of ​​lower pressure, where it cools and returns to liquid form, and then it moves back to the heat source. In an embodiment, the two-phase cooling device may in particular comprise a heat pipe or a steam chamber element, in particular a heat pipe, or in particular a steam chamber element. Steam chamber elements and heat pipes are known in the art and may be based on substantially the same principle. The difference between a heat pipe and a steam chamber element may be that a heat pipe may typically have a substantially rod-shaped shape, whereas a steam chamber element may typically have a planar shape. In particular, the steam chamber element may comprise two substantially planar plates at a relatively short distance (such as up to 5 mm). In addition, for steam chamber elements, the hot spots may be relatively freely selected, whereas for heat pipes, there are typically hot and cold sides on opposite sides of a rod (such as at the base of a cylindrical heat pipe).

[0111] If an element can exchange energy through a thermal process, it can be considered to be "thermally in contact" with another element. Therefore, these elements can be thermally coupled. In an embodiment, thermal contact can be achieved by physical contact. In an embodiment, thermal contact can be achieved via a thermally conductive material, such as a thermally conductive glue (or thermally conductive adhesive). When two elements are arranged relative to each other at a distance equal to or less than about 10 μm, thermal contact can also be achieved between the two elements, although a larger distance (such as up to 100 μm) may be possible. The shorter the distance, the better the thermal contact. In particular, the distance is 10 μm or less, such as 5 μm or less, such as 1 μm or less. The distance can be the distance between two corresponding surfaces of the corresponding elements. The distance can be an average distance. For example, the two elements can be in physical contact at one or more positions (such as multiple positions), but at one or more other positions (especially multiple other positions), the elements are not in physical contact. For example, this may occur when one or both elements have a rough surface. Therefore, in an embodiment, the average distance between the two elements can be 10 μm or less (although a larger average distance may be possible, such as up to 100 μm). In an embodiment, the two surfaces of two elements can be kept at a certain distance with one or more distance retainers. When the two elements are in thermal contact, they can be in physical contact, or they may be configured to be located at a short distance from each other (such as a maximum of 10 μm, such as a maximum of 1 mm). When the two elements are configured to be located at a certain distance from each other, an intermediate material can be configured between them, but in other embodiments, the distance between the two elements can be filled with gas, liquid, or can be a vacuum. When the intermediate material is available, the greater the distance, the higher the thermal conductivity, which can be useful for thermal contact between the two elements. However, the smaller the distance, the lower the thermal conductivity of the intermediate material can be (of course, materials with higher thermal conductivity can also be used).

[0112] The luminophore may be a layer, such as a self-supporting layer. The luminophore may also be a coating. The luminophore may also include a luminescent coating on a support (particularly a light-transmitting support in a transmission mode, or a reflective support in a reflection mode). In particular, the luminophore may be substantially self-supporting. In an embodiment, the luminescent material may be provided as a luminophore, such as a luminescent single crystal, a luminescent glass, or a luminescent ceramic body. Such a body may be indicated as a "converter body" or a "luminophore". In an embodiment, the luminophore may be a luminescent single crystal or a luminescent ceramic body. For example, in an embodiment, a garnet luminescent material including cerium may be provided as a luminescent single crystal or a luminescent ceramic body. In other embodiments, the luminophore may include a light-transmitting body in which a luminescent material is embedded. For example, the luminophore may include a glass body in which a luminescent material is embedded. Alternatively, the glass itself may be luminescent. In other embodiments, the luminophore may include a polymer body in which a luminescent material is embedded. The luminophore may have any shape. However, in general, the luminophore may include two substantially parallel faces defining a height (of the luminophore). In addition, the luminophore may include an edge face bridging two substantially parallel faces. The edge face may be curved in one or two dimensions. The edge face can be planar. The luminophore can have a rectangular or circular cross section, but other cross sections may also be possible, such as, for example, a hexagon, an octagon, etc. Therefore, the luminophore can have a circular cross section, an elliptical cross section, a square or a non-square rectangle. In an embodiment, the luminophore can have an n-sided cross section, wherein n is at least 3, such as 4 (square or rectangular cross section), 5 (pentagonal cross section), 6 (hexagonal cross section), 8 (octagonal cross section) or higher. These two substantially parallel faces may also be indicated as "main faces" because they may particularly provide the maximum external area of ​​the luminophore. Perpendicular to the above cross section may be another cross section, which may be rectangular in an embodiment. Therefore, the luminophore may, for example, have a cubic shape, a (non-cubic) cuboid shape, an n (n is at least 5) angular prism shape (such as a pentagonal prism, a hexagonal prism) and a cylindrical shape. However, other shapes may also be possible. In particular, the luminophore may have a cuboid shape, a cylindrical shape or an n-sided prism shape, wherein n is 6 or 8.

[0113] In an embodiment, the luminophore (or "body") has a lateral dimension width or length (W1 or L1) or diameter (D) and a thickness or height (H1). In an embodiment, (i) D≥H1 or (ii) W1≥H1 and / or L1≥H1. The luminophore may be transparent or light scattering. In an embodiment, the luminophore may comprise a ceramic luminescent material. In a specific embodiment, L1≤10mm, such as in particular L1≤5mm, more in particular L1≤3mm, most in particular L1≤2mm. In a specific embodiment, W1≤10mm, such as in particular W1≤5mm, more in particular W1≤3mm, most in particular W1≤2mm. In a specific embodiment, H1≤10mm, such as in particular H1≤5mm, more in particular H1≤3mm, most in particular H1≤2mm. In a specific embodiment, D≤10mm, such as in particular D≤5mm, more in particular D≤3mm, most in particular D≤2mm. In a specific embodiment, the thickness of the body in the embodiment may be in the range of 50 μm to 1 mm. In addition, the body has a lateral dimension (width / diameter) that may be in the range of 100 μm to 10 mm. In a further specific embodiment, (i) D>H1 or (ii) W1>H1 and L1>H1. In particular, the lateral dimension (such as length, width and diameter, etc.) is at least 2 times (such as at least 5 times) larger than the height. In a specific embodiment, the luminophore has a first length L1, a first height H1 and a first width W1, wherein H1≤0.5*L1 and H1≤0.5*W1. In an embodiment, the luminophore may be a (small) tile. In an embodiment, the luminophore may include a first face, a second face and a side face bridging the first face and the second face). The first face and the second face may also be indicated as the main face. In the case of a cylinder, the side face may be a single side face. In the case of a cuboid, the side face may include four faces. In the case of a hexagonal prism, the side face may include six faces.

[0114] Thus, in an embodiment, the system may include (i) a light emitting body including a first light emitting material, (ii) a first thermal conductor configured to be in thermal contact with the first light emitting material (more particularly, in an embodiment, the first thermal conductor may be configured to be in thermal contact with the light emitting body).

[0115] The heat conductor can be used to cool the (first) luminescent material, which may be subjected to relatively intense laser light. Alternatively or additionally, the (other) heat conductor can be used to cool the first light generating device and / or the second light generating device. In an embodiment, the system may include a laser group, which includes a plurality of first laser light sources. Alternatively or additionally, the system may include a laser group, which includes a plurality of second laser light sources. The laser group may be configured to be in thermal contact with one or more heat conductors. In a specific embodiment, the system may (also) include: (i) a laser group, including a first laser light source, a second laser light source; and (ii) a second heat conductor configured to be in thermal contact with the first laser light source and the second laser light source. The phrase "a laser group including a laser light source" and similar phrases may also be interpreted as a laser group hosting a laser light source. Laser groups are known in the art and may also be indicated as "laser array groups".

[0116] A good (first) luminescent material may be a garnet-type luminescent material doped with cerium. Such materials are known in the art. In a specific embodiment, the first luminescent material comprises a type A 3 B 5 O 12 : Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc. As indicated above, the system may comprise a luminophore comprising the first luminescent material. In particular, in an embodiment, the luminophore may comprise a ceramic body (in particular comprising a type A 3 B 5 O 12 :Ce 3+ of luminescent materials).

[0117] In order to improve the color rendering index and / or increase the CCT range and / or improve the color gamut of the system light, one or more of a second luminescent material and a third light generating device may be applied, which may be configured to generate (luminescent material) light in the yellow and / or orange and / or red wavelength range (particularly in the orange-red wavelength range). In particular, such a second luminescent material may be configured to (also) convert part of the first device light, although other solutions may also be possible. Therefore, in an embodiment, the system may further comprise one or more of the following: (a) a second luminescent material, configured to convert at least part of the first device light into a second luminescent material light, the second luminescent material light particularly having a second centroid wavelength (λ) in the yellow-red wavelength range. c,2); and (b) a third light generating device, comprising a third laser light source, and configured to generate a third device light, the third device light having a third device light peak wavelength (λ3) and having a third spectral power distribution, the third spectral power distribution being different from the first spectral power distribution and the second spectral power distribution; wherein the third device light peak wavelength (λ3) may be selected from a yellow-red wavelength range (particularly an orange-red wavelength range, more particularly a wavelength range of 600 nm to 650 nm). The term "yellow-red wavelength range" may particularly refer to a wavelength range of 560 nm to 780 nm. The term "orange-red wavelength range" may particularly refer to a wavelength range of 590 nm to 780 nm. In a specific embodiment, λ c,1 <λ c,2 For example, in an embodiment, λ c,2 -λ c,1 ≥15nm, such as λ c,2 -λ c,1 ≥20nm, more particularly λ c,2 -λ c,1 ≥30nm.

[0118] Note that the term "third light generating device" may also refer to a plurality of (different) third light generating devices. Likewise, this may apply to the terms "first light generating device" and "second light generating device", respectively. Furthermore, the term "second luminescent material" may also refer to a plurality of different second luminescent materials.

[0119] As indicated above, in embodiments, the system may include a luminophore, the luminophore comprising a first luminescent material. In specific embodiments, wherein the system further comprises a second luminescent material, the luminophore may (also) comprise the second luminescent material.

[0120] As indicated above, in an embodiment, the second device light is not (substantially) converted by the first luminescent material (because the second device light can bypass the first luminescent material). Furthermore, in an embodiment, the second device light is not (substantially) converted by the second luminescent material (because the second device light can bypass the second luminescent material).

[0121] As indicated above, the first luminescent material may not be configured downstream of the second light generating device. Since the system light (in one or more operating modes of the system) may include the second device light and the first luminescent material light, these two types of light may have to be combined together. Therefore, in an embodiment, the system may also include a beam combiner, which is configured to combine at least a portion of the first device light and at least a portion of the second device light into a device beam. In particular, in an embodiment, the beam combiner can be selected from a group of dichroic beam combiners and polarization beam combiners. In an embodiment, light mixing optics can (therefore) be applied to combine light from different light sources and / or light propagating via different light paths. In an embodiment, the light mixing optics may include one or more of a diffuser (surface or volume scattering diffuser or engineered holographic optical element), a light pipe, a light guide, a Koehler integrator optical device, etc. Alternatively or additionally, the light mixing optics may include a collimator or other collimating optics. Alternatively or additionally, the light mixing optics may include a dichroic beam combiner, such as a dichroic cube in a specific embodiment. In embodiments, the light mixing optics may include a dichroic beam splitter.

[0122] It may be desirable to generate a system beam that can be relatively collimated. To this end, for example, a second optical device may be applied. Such a second optical device may include one or more of a collimator and a lens. Such a second optical device may be configured downstream of the first luminescent material, the first light generating device, the second light generating device, the optional second luminescent material, and the optional third light generating device. In an embodiment, the second optical element may include one or more lenses to collimate the system light. When multiple first light generating devices are applied, for example, a lens array may be applied. Alternatively, a collimator or a collimator array may be applied separately. For example, an embodiment is also described in US2005 / 0270775, which is incorporated herein by reference.

[0123] Therefore, in an embodiment, the system may further include a second optical device configured to shape the system light into a beam (of the system light) having a full width at half maximum of a maximum of 5° (more particularly a maximum of 3°, even more particularly a maximum of 2°, such as a maximum of about 1.5°).

[0124] As indicated above, it may be desirable to control the correlated color temperature of the system light. In a particular embodiment, the control system may be configured to control the first light generating device and the second light generating device (and optionally the third light generating device) such that in a (third) operating mode of the light generating system, the system light has a correlated color temperature selected from a range of at least 6000K (such as at least 6500K), such as selected from a range of 7000K to 10000K. In a particular embodiment, the system light may have a correlated color temperature selected from a range of at least 7500K (such as at least about 7800K). However, in a particular embodiment, the system light may have a correlated color temperature selected from a range of at least 8000K. In an embodiment, such a (third) operating mode may include the second operating mode described herein, although in other embodiments it may also include the first operating mode. In particular, the first operating mode and the second operating mode are temporally non-overlapping.

[0125] In an embodiment, in one of the operating modes of the light generating system, the system light may have a spectral power distribution in the visible wavelength range, wherein at least 5% of the spectral power is provided by the second device light; wherein at least 25% of the spectral power distribution is provided by the first device light, and wherein at least 30% of the spectral power distribution is provided by the first luminescent material light. Additionally or alternatively, in (another) one of the operating modes of the light generating system, the system light may have a spectral power distribution in the visible wavelength range, wherein less than 1% of the spectral power is provided by the second device light; wherein at least 25% of the spectral power distribution is provided by the first device light, and wherein at least 30% of the spectral power distribution is provided by the first luminescent material light.

[0126] In an embodiment, in an operating mode, the control system may control the system light so that when the correlated color temperature increases, the radiant flux of the system light increases, and when the correlated color temperature decreases, the radiant flux of the system light decreases. This may also be indicated as "BBL dimming".

[0127] The light generating system may be part of or may be used in, for example, office lighting systems, home application systems, store lighting systems, home lighting systems, accent lighting systems, spotlighting systems, theatre lighting systems, fibre optic application systems, projection systems, self-lighting display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, greenhouse lighting systems, horticultural lighting, digital projection or LCD backlighting. The light generating system (or luminaire) may be part of or may be used in, for example, an optical communication system or a disinfection system.

[0128] However, in another aspect, the present invention also provides a lamp or a lamp comprising a light generating system as defined herein. The lamp may also include a housing, an optical element, a shutter, etc. The lamp or the lamp may also include a housing enclosing the light generating system. The lamp or the lamp may include a light window or a housing opening in the housing through which the system light escapes from the housing. However, in another aspect, the present invention also provides a projection device comprising a light generating system as defined herein. In particular, a projection device or a "projector" or an "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 generating systems such as described herein. Therefore, in one aspect, the present invention also provides a light generating device selected from the group of lamps, lamps, projector devices, disinfection devices, photochemical reactors, and optical wireless communication devices, including a light generating system as defined herein. The light generating device may include a housing or a carrier configured to accommodate or support one or more elements of the light generating system. For example, in an embodiment, the light generating device may include a housing or carrier configured to accommodate or support one or more of the first light generating device, the second light generating device, the first luminescent material and optional other components such as mentioned above.

[0129] In particular, the lamp or luminaire may be configured for stage lighting. Therefore, in one aspect, the invention also provides a method for providing light to a stage, comprising generating system light using the light generating system described herein in a space comprising the stage. The stage may be indoors, such as a theatre, but the stage may also be outdoor, such as in a stadium or a festival stage, TV studio lighting, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0130] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying schematic drawings, in which corresponding reference characters indicate corresponding parts, and in which:

[0131] Figure 1 Some embodiments are schematically depicted;

[0132] Figures 2a to 2b schematically depict some aspects; and

[0133] Figure 3 Some application embodiments are schematically depicted. The schematic diagrams are not necessarily drawn to scale. DETAILED DESCRIPTION

[0134] Figure 1Six possible embodiments are schematically depicted. With reference to these embodiments, a light generating system 1000 is depicted comprising a first light generating device 110, a second light generating device 120 and a first luminescent material 210. Furthermore, a control system 300 may be available; however, the control system 300 is not drawn in all embodiments.

[0135] The first light generating device 110 may include a first laser light source 10 and may be configured to generate a first device light 111 having a first device light peak wavelength λ 1 And has a first spectral power distribution (see also FIG. 2a). The first device light peak wavelength λ can be selected in the wavelength range of 425 nm to 465 nm. 1 The second light generating device 120 may include a second laser light source 20 and may be configured to generate a second device light 121 having a second device light peak wavelength λ 2 and having a second spectral power distribution different from the first spectral power distribution (see also FIG. 2a). The second device light peak wavelength (λ) may be selected from the range of 470 nm to 490 nm. 2 ). The first luminescent material 210 may be configured to be in a light receiving relationship with the first light generating device 110 and may be configured to convert at least a portion of the first device light 111 into first luminescent material light 211 having a luminescent material emission centroid wavelength λ in the green-yellow wavelength range. c,1 (See also FIG. 2a .) The first luminescent material 210 may not be configured to be in a light receiving relationship with the second light generating device 120. In particular, the light generating system 1000 may be configured to generate system light 1001, the system light 1001 comprising one or more of the first device light 111, the second device light 121, and the first luminescent material light 211. The system light 1001 has a controllable correlated color temperature. A control system indicated by reference numeral 300 (see, for example, embodiments V to VI; but such a control system 300 may of course also be usable in the schematically depicted embodiments I to IV) may be configured to control the first light generating device 110 and the second light generating device 120 such that one or more of the following may apply: (a) in a first operating mode of the light generating system 1000, the system light 1001 has a first correlated color temperature CCT1, wherein CCT1 ≥ 4000K, (b) in a second operating mode of the light generating system 1000, the system light 1001 has a second correlated color temperature (CCT2), wherein CCT2 - CCT1 ≥ 1000K, (c) in at least one of the operating modes, the system light 1001 has a correlated color temperature selected from a range of at least 7000K, and (d) the system light 1001 has a color rendering index of at least 70 in both operating modes.

[0136] In an embodiment, the first light generating device 110 and the first luminescent material 210 may be configured such that a portion of the first device light 111 may be converted into the luminescent material light 211. In an embodiment, the system light 1001 may include (i) at least a portion of the unconverted first device light 111, (ii) the second device light 121 and (iii) the first luminescent material light 211.

[0137] In an embodiment, see, for example, Embodiments II to VI, the light generating system 1000 may include one or more first light generating devices 110 configured to generate a first device light 111. The one or more first light generating devices 110 and the optional optical device 400 may be configured so that a portion of the first device light 111 bypasses the first luminescent material 210. In an embodiment, the system light 1001 may include (i) at least a portion of (the) first device light 111 that bypasses the first luminescent material 210, (ii) the second device light 121, and (iii) the first luminescent material light 211. Therefore, in an embodiment, the light generating system 1000 may include a plurality of first light generating devices 110. The plurality of first light generating devices 110 may include a primary first light generating device 1110 and a secondary first light generating device 2110. The first luminescent material 210 may be configured to be in a light receiving relationship with one of the primary first light generating device 1110 and the secondary first light generating device 2110 , and the first luminescent material may not be configured to be in a light receiving relationship with the other of the primary first light generating device 1110 and the secondary first light generating device 2110 .

[0138] In an embodiment, the light generating system 1000 may include a light emitting body 1200, which includes a first light emitting material 210. Alternatively or additionally, in an embodiment, the light generating system 1000 may include a first heat conductor 505 configured to be in thermal contact with the first light emitting material 210. In particular, in an embodiment, the first heat conductor 505 may be configured to be in thermal contact with the light emitting body 1200. Furthermore, in an embodiment, the light generating system 1000 may include a laser group 550, which includes a first laser light source 10, a second laser light source 20, and a second heat conductor 555, which is configured to be in thermal contact with the first laser light source 10 and the second laser light source 20 (see schematically depicted embodiments V to VI).

[0139] In a specific embodiment, the first luminescent material 210 may be configured in a transmissive mode (see, for example, embodiments I to II). In specific (other) embodiments, the first luminescent material 210 may be configured in a reflective mode (see, for example, embodiments III to VI).

[0140] The light generating system 1000 may include a first optical element 420 configured to focus the first device light 111 on at least a portion of the first luminescent material 210. In an embodiment, the first luminescent material 210 may include a type A 3 B 5 O 12 : Ce, A may include one or more of Y, La, Gd, Tb and Lu, and B may include one or more of Al, Ga, In and Sc. In an embodiment, the light emitting body 1200 (such as a ceramic body) may include the first light emitting material 210.

[0141] In a specific embodiment, the light generating system 1000 may further include a second luminescent material 220 configured to convert at least a portion of the first device light 111 into a second luminescent material light having a second centroid wavelength (λ) in the yellow-red wavelength range. c,2 ). In particular, the following may apply: c,1 <λ c,2 Several configurations of the second luminescent material 220 may be possible. This is schematically illustrated in FIG. 2 b , in connection with an embodiment in which the first luminescent material 210 and the second luminescent material 220 are combined (e.g. in a luminophore). Thus, in an embodiment, the luminophore 1200 may include the second luminescent material 220. As indicated above, in an embodiment, the luminophore 1200 may include a ceramic body.

[0142] Alternatively or additionally, in a specific embodiment, the light generating system 1000 may further include a third light generating device 130, which includes a third laser light source 30 and is configured to generate a third device light 131, the third device light 131 having a third device light peak wavelength (λ 3 ) and having a third spectral power distribution that is different from the first spectral power distribution and different from the second spectral power distribution. Figure 1 The third device light peak wavelength λ may be selected from the range of 600 nm to 650 nm. 3 , see also Figure 2a.

[0143] In a specific embodiment, the light generating system 1000 may further include a beam combiner 410, which is configured to combine at least a portion of the first device light 111 and at least a portion of the second device light 121 into a beam of device light 111, device light 121. The term "beam combiner" may also refer to a plurality of beam combiners. When other beams are available, for example from an optional third light generating device, one or more other beam combiners 410 may be applied. The beam combiner 410 may be selected from the group of a dichroic beam combiner and a polarization beam combiner.

[0144] In an embodiment, the light generating system 1000 may further include a second optical device 430, which is configured to shape the system light 1001 beam into a beam having a maximum half-maximum full width of 2°, but other beam angles α are not excluded herein. The second optical device may, for example, include a collimator. With reference to embodiments I and II, these second optical devices 430 are schematically depicted, with reference numeral O referring to the optical axis. If the radiant flux diagram is drawn perpendicular to the optical axis, the half-maximum full width may provide a beam angle α of, for example, 2°.

[0145] As indicated above, the light generating system 1000 may include a control system. In an embodiment, the control system 300 may be configured to control the first light generating device 110 and the second light generating device 120 (and optionally the third light generating device 130), in a specific embodiment such that in an operating mode of the light generating system 1000, the system light 1001 has a correlated color temperature selected from the range of 7000K to 10000K.

[0146] In an embodiment, in one of the operating modes of the light generating system 1000, the system light 1001 has a spectral power distribution in the visible wavelength range, wherein at least 5% of the spectral power can be provided by the second device light 121, at least 25% of the spectral power distribution can be provided by the first device light 111, and at least 30% of the spectral power distribution can be provided by the first luminescent material light 201.

[0147] In an embodiment, in (another) one of the operating modes of the light generating system 1000, the system light 1001 has a spectral power distribution in the visible wavelength range, wherein less than 1% of the spectral power may be provided by the second device light 121, at least 25% of the spectral power distribution may be provided by the first device light 111, and at least 30% of the spectral power distribution may be provided by the first luminescent material light 201. In an embodiment, in the operating mode, the control system 300 controls the system light 1001 such that the radiant flux of the system light 1001 may increase when the correlated color temperature increases, and the radiant flux of the system light 1001 may decrease when the correlated color temperature decreases.

[0148] Referring also to FIG. 2a , one or more of the following may apply: (i) the first device light peak wavelength λ may be selected from the wavelength range of 430 nm to 460 nm. 1 , (ii) and the second device light peak wavelength λ may be selected from the wavelength range of 475 nm to 485 nm 2 As schematically depicted, the spectral overlap is substantially zero (%). In addition, at the first device light peak wavelength λ 1 The peak wavelength of the second device light is λ 2 There may be no third peak in between.

[0149] Referring to Fig. 2b, an embodiment of a luminophore 1200 comprising a first luminescent material 210 and an optional second luminescent material 220 is schematically shown. Reference numeral 200 generally refers to the luminescent material. Furthermore, an embodiment is schematically shown in which the second device light 121 bypasses the first luminescent material 210 (and the second luminescent material 220). Furthermore, an embodiment is schematically shown in which the first device light 111 is partially transmitted by the first luminescent material 210 (and the second luminescent material 220) (more particularly transmitted by the luminophore 1200) and partially converted by the first luminescent material 210 (and the second luminescent material 220) into the first luminescent material light 211 (and the second luminescent material light 221).

[0150] Figure 3 An embodiment of a luminaire 2 comprising the light generating system 1000 described above is schematically depicted. Reference numeral 301 indicates a user interface which may be functionally coupled with a control system 300 comprised in the light generating system 1000 or functionally coupled thereto. Figure 3 Also schematically depicted is an embodiment of a lamp 1 comprising a light generating system 1000. Reference numeral 3 indicates a projector device or a projector system, which can be used to project an image, such as onto a wall, and which can also comprise the light generating system 1000. Thus, Figure 3 An embodiment of a lighting device 1200 selected from the group of a lamp 1, a lamp fixture 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device is schematically depicted, which includes the light generating system 1000 described herein. In an embodiment, such a lighting device may be a lamp 1, a lamp fixture 2, a projector device 3, a disinfection device, or an optical wireless communication device. The lighting device light escaping from the lighting device 1200 is indicated with reference numeral 1201. The lighting device light 1201 may essentially consist of the system light 1001, and may therefore be the system light 1001 in a specific embodiment. Reference numeral 1300 refers to a space (such as a room). Reference numeral 1305 refers to a floor, and reference numeral 1310 refers to a ceiling; reference numeral 1307 refers to a wall.

[0151] The term "plurality" refers to two or more.

[0152] 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 in the form of "entirely", "completely", "all". Therefore, in embodiments, the adjectives substantially or substantially may also be removed. Where applicable, the term "substantially" or the term "essentially" may also refer to 90% or more, such as 95% or more, particularly 99% or more, even more particularly 99.5% or more, including 100%.

[0153] The term "comprise" also includes embodiments wherein the term "comprises" means "consisting of.

[0154] The term "and / or" specifically refers to one or more of the items mentioned before and after "and / or". For example, the phrase "item 1 and / or item 2" and similar phrases may refer to one or more of item 1 and item 2. The term "comprising" may refer to "consisting of" in an embodiment, but may also refer to "including at least the defined species and optionally one or more other species" in another embodiment.

[0155] Furthermore, the terms first, second, third, etc. in the specification and claims are used to distinguish similar elements and not necessarily to describe a sequential order or a chronological order. It should be understood that the terms so used are interchangeable under appropriate circumstances, and that the embodiments of the invention described herein are capable of operating in other sequences than those described or illustrated herein.

[0156] Among other things, an apparatus, device or system may be described herein during operation. As will be apparent to one skilled in the art, the present invention is not limited to methods of operation or apparatus, devices or systems in operation.

[0157] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

[0158] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0159] The use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those specified in a claim. Unless the context clearly requires otherwise, throughout the specification and claims, the words "comprise", "comprising", etc. should be interpreted in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, in the sense of "including, but not limited to".

[0160] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0161] The invention can be implemented by means of hardware comprising several distinct elements and by means of a suitably programmed computer. In a device claim or an apparatus claim or a system claim enumerating several means, several of these means may be implemented by one and the same item of hardware. The fact that certain measures are listed in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. However, in another aspect, the invention (therefore) provides a software product which, when run on a computer, is capable of implementing (one or more embodiments of) the means described herein.

[0162] The present invention also provides a control system that can control a device, apparatus or system, or can perform a method or process described herein. In addition, however, the present invention also provides a computer program product that, when run on a computer that is functionally coupled to or included in a device, apparatus or system, controls one or more controllable elements of such a device, apparatus or system.

[0163] The present invention also applies to an apparatus, device or system comprising one or more of the characterizing features described in the specification and / or shown in the attached drawings. The present invention also relates to a method or process comprising one or more of the characterizing features described in the specification and / or shown in the attached drawings.

[0164] The various aspects discussed in this patent can be combined to provide additional advantages. In addition, those skilled in the art will appreciate that the embodiments can be combined, and more than two embodiments can also be combined. In addition, some of the features can form the basis for one or more divisional applications.

Claims

1. A light generating system (1000), comprising a plurality of first light generating devices (110), a second light generating device (120), a first luminescent material (210) and a control system (300), wherein: The plurality of first light generating devices (110) include a first laser light source (10) and are configured to generate a first device light (111), the first device light (111) having a first device light peak wavelength (λ1) and having a first spectral power distribution; wherein the first device light peak wavelength (λ1) is selected from a wavelength range of 425 nm to 465 nm; The second light generating device (120) comprises a second laser light source (20) and is configured to generate a second device light (121), the second device light (121) having a second device light peak wavelength (λ2) and having a second spectral power distribution different from the first spectral power distribution; wherein the second device light peak wavelength (λ2) is selected from a range of 470 nm to 490 nm; The first luminescent material (210) is arranged in a light receiving relationship with the first light generating device (110) and is arranged to convert at least part of the first device light (111) into first luminescent material light (211), the first luminescent material light (211) having a luminescent material emission centroid wavelength (λ) in the green-yellow wavelength range. c,1 ); and the first luminescent material (210) is not configured to be in a light receiving relationship with the second light generating device (120); wherein the plurality of first light generating devices (110) include a primary first light generating device (1110) and a secondary first light generating device (2110), wherein the first luminescent material (210) is configured to be in a light receiving relationship with one of the primary first light generating device (1110) and the secondary first light generating device (2110), and wherein the first luminescent material (210) is not configured to be in a light receiving relationship with the other of the primary first light generating device (1110) and the secondary first light generating device (2110); The light generating system (1000) is configured to generate system light (1001) including one or more of the first device light (111), the second device light (121) and the first luminescent material light (211), wherein the system light (1001) has a controllable correlated color temperature; The control system (300) is configured to control the first light generating device (110) and the second light generating device (120) so that (a) in a first operation mode of the light generating system (1000), the system light (1001) has a first correlated color temperature CCT1, wherein CCT1≥4000K, (b) in a second operation mode of the light generating system (1000), the system light (1001) has a second correlated color temperature (CCT2), wherein CCT2-CCT1≥1000K, (c) in at least one of the operation modes, the system light (1001) has a correlated color temperature selected from a range of at least 7000K, and (d) the system light (1001) has a color rendering index of at least 70 in both operation modes.

2. The light generating system (1000) according to claim 1, wherein the first light generating device (110) and the first luminescent material (210) are configured so that part of the first device light (111) is converted into the luminescent material light (211); wherein the system light (1001) includes (i) at least part of the unconverted first device light (111), (ii) the second device light (121), and (iii) the first luminescent material light (211).

3. A light generating system (1000) according to any of the preceding claims, wherein the system light (1001) includes (i) at least a portion of the first device light (111) that bypasses the first luminescent material (210), (ii) the second device light (121), and (iii) the first luminescent material light (211).

4. The light generating system (1000) according to any one of the preceding claims, comprising: (i) a luminescent body (1200), comprising the first luminescent material (210); (ii) a first heat conductor (505) configured to be in thermal contact with the first luminescent material (210); and (iii) a laser group (550) comprising the first laser light source (10), the second laser light source (20) and a second heat conductor (555), wherein the second heat conductor (555) is configured to be in thermal contact with the first laser light source (10) and the second laser light source (20).

5. The light generating system (1000) of claim 4, wherein the light emitting body (1200) comprises a ceramic body.

6. A light generating system (1000) according to any one of the preceding claims 1 to 5, wherein the first luminescent material (210) is configured to be in a reflective mode; and wherein the light generating system (1000) includes a first optical element (420), the first optical element (420) being configured to focus the first device light (111) onto at least a portion of the first luminescent material.

7. A light generating system (1000) according to any one of the preceding claims 1 to 5, wherein the first luminescent material (210) is configured to be in a transmission mode; and wherein the light generating system (1000) includes a first optical element (420), and the first optical element (420) is configured to focus the first device light (111) onto at least a portion of the first luminescent material.

8. The light generating system (1000) according to any one of the preceding claims, wherein the first luminescent material (210) comprises a luminescent material of type A3B50. 12 :Ce light-emitting material, wherein A includes one or more of Y, La, Gd, Tb and Lu, and wherein B includes one or more of Al, Ga, In and Sc.

9. The light generating system (1000) according to any one of the preceding claims, further comprising one or more of the following: A second luminescent material (220) configured to convert at least part of the first device light (111) into a second luminescent material light (221), the second luminescent material light (221) having a second centroid wavelength (λ) in the yellow-red wavelength range c,2 ), where λ c,1 <λ c,2 ;as well as A third light generating device (130) comprises a third laser light source (30) and is configured to generate a third device light (131), wherein the third device light (131) has a third device light peak wavelength (λ3) and has a third spectral power distribution, wherein the third spectral power distribution is different from the first spectral power distribution and from the second spectral power distribution; wherein the third device light peak wavelength (λ3) is selected from the range of 600 nm to 650 nm.

10. The light generating system (1000) according to any of the preceding claims, further comprising a beam combiner (410), the beam combiner (410) being configured to combine at least a portion of the first device light (111) and at least a portion of the second device light (121) into a beam of device lights (111, 121); wherein the beam combiner (410) is selected from the group of dichroic beam combiners and polarization beam combiners.

11. The light generating system (1000) according to any of the preceding claims, further comprising a second optical device (430), the second optical device (430) being configured to shape the system light (1001) beam into a beam having a full width at half maximum of 2°; and wherein the first device light peak wavelength (λ1) is selected from a wavelength range of 430nm to 460nm, and / or wherein the second device light peak wavelength (λ2) is selected from a wavelength range of 475nm to 485nm.

12. The light generating system (1000) according to any of the preceding claims, wherein the control system (300) is configured to control the first light generating device (110) and the second light generating device (120) so that in an operating mode of the light generating system (1000), the system light (1001) has a correlated color temperature selected from the range of 7000K to 10000K.

13. The light generating system (1000) according to any one of the preceding claims, wherein: In one of the operating modes of the light generating system (1000), the system light (1001) has a spectral power distribution in the visible wavelength range, wherein at least 5% of the spectral power is provided by the second device light (121); wherein at least 25% of the spectral power distribution is provided by the first device light (111), and wherein at least 30% of the spectral power distribution is provided by the first luminescent material light (201); and / or In one of the operating modes of the light generating system (1000), the system light (1001) has a spectral power distribution in the visible wavelength range, wherein less than 1% of the spectral power is provided by the second device light (121); wherein at least 25% of the spectral power distribution is provided by the first device light (111), and wherein at least 30% of the spectral power distribution is provided by the first luminescent material light (201).

14. The light generating system (1000) according to any one of the preceding claims, wherein in an operating mode, the control system (300) controls the system light (1001) so that when the correlated color temperature is increased, the radiant flux of the system light (1001) increases, and when the correlated color temperature is decreased, the radiant flux of the system light (1001) decreases.

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

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