Laser phosphor light source using phosphors in transmission and reflection modes

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a light emitter (210), an optional first dichroic mirror (521) and a heat conductor (500) wherein: the first light generating device (110) is configured to generate first device light (111); wherein the second light generating device (120) is configured to generate second device light (121); the luminous body (210) comprises a luminous material (200); wherein the luminescent material (200) is configured to convert (i) at least a portion of the first device light (111) received by the luminescent material (200) and (ii) at least a portion of the second device light (121) received by the luminescent material (200) into luminescent material light (201); wherein the luminous body (210) comprises a first side surface (211), a second side surface (212) and a third side surface (213) bridging the first side surface (211) and the second side surface (212); a light-transmitting portion (501) of the heat conductor (500); the first side (211) of the luminophor (210) is configured to be in light-receiving relationship with the first light-generating device (110) via the light-transmissive portion (501); the second side (212) of the light emitter (210) is configured to be in light-receiving relationship with a second light-generating device (120); and one or more of a portion of the first side (211) and at least a portion of the third side (213) is configured to be in thermal contact with the heat conductor (500); an optional first dichroic mirror (521) is configured between the first light generating device (110) and the luminophor (210), wherein the first dichroic mirror (521) is configured to have (i) a higher transmittance for the first device light (111) than for the luminescent material light (201) and (ii) a higher reflectance for the luminescent material light (201) than for the first device light (111); and the light generating system (1000) is configured to generate system light (1001) comprising luminescent material light (201) in a first mode of operation of the light generating system (1000).

Description

Technical Field

[0001] This invention relates to a light generating system. It also relates to a lighting device including such a light generating system. Background Technology

[0002] High-brightness laser phosphor light sources are known in the art. For example, US2012236536 describes a light-generating device that may include a fluorescent panel having a first surface and a second surface opposite the first surface, and is configured to emit fluorescence by laser irradiation. A first laser source may be provided such that the first surface of the fluorescent panel is irradiated with the first laser. A second laser source may be provided such that the second surface of the fluorescent panel is irradiated with the second laser. A reflector may include a light-passing aperture through which the second laser can pass, and may include a concave reflective surface configured to cover at least an irradiated area on the fluorescent panel with the second laser. A lens may be disposed in a space closer to the first surface of the fluorescent panel.

[0003] WO2021 / 063878A discloses a light-generating device comprising a first blue laser, a second blue laser, a green laser, a red laser, a light-emitting element, and optics. The light-emitting element is excited by the first blue laser for generating emitted light. Light from the green laser is transmitted through the light-emitting element. The light from the green laser, the emitted light, the light from the red laser, and the light from the second blue laser are combined by the optics.

[0004] US2015 / 184830A discloses a wavelength conversion component including a thermal conductor, an optical guide path, and a wavelength converter. The thermal conductor has a recessed portion and an opening extending through the thermal conductor. The optical guide path includes a transparent material filling the opening. The optical guide path includes a light exit disposed on one side of the recessed portion and a light entrance disposed on the opposite side of the recessed portion. The wavelength converter converts first light having a first peak wavelength incident through the optical guide path into second light having a second peak wavelength different from the first peak wavelength. The wavelength converter is configured to contact the thermal conductor, and at least a portion of the wavelength converter is embedded in the recessed portion.

[0005] WO2023 / 126202A discloses a light generation system comprising a first blue laser source, a second blue laser source, and a third red laser, and a light-emitting material for converting the light from the first and second lasers into green-orange light. The system generates white light.

[0006] CN105700281A discloses an assembly comprising a phosphor wheel, a first light source, a second light source, a dichroic mirror, and a collimator. The phosphor in the phosphor wheel converts the light from the first and second light sources into yellow light. The dichroic mirror reflects the light from the first light source back to the phosphor wheel and transmits the yellow light generated by the phosphor wheel. Summary of the Invention

[0007] High-brightness light sources can be used in a variety of applications, including spotlights, stage lighting, headlamps, home and office lighting, and automotive lighting. For this purpose, laser-phosphor technology can be used, where a laser provides the light and a remote phosphor converts the laser into converted light. A relatively straightforward method for generating white light using a laser is to use a laser combined with a light-emitting converter to generate phosphor-converted light. Laser-phosphor systems can produce high-brightness light and therefore can be used in projection systems, including displays such as cinema projectors and projectors for home, school, and office applications, automotive headlights, searchlights, stage lighting, architectural lighting, and special lighting applications. However, the performance of laser-phosphor technology can be limited by photoexcitation quenching (“photoquenching”). Furthermore, the intensity of blue laser light decreases as a function of the path length of the laser in the (far)phosphor, thus reducing the efficiency of the laser-phosphor system at higher depths within the phosphor. Increasing the intensity of the laser supplied to the phosphor to improve efficiency, or adding an additional laser source that irradiates the same phosphor, can increase the temperature and amount of heat generated in the phosphor, thereby reducing its lifetime and causing thermal quenching.

[0008] Therefore, one aspect of the present invention is to provide an alternative light generation system that preferably further avoids at least partially one or more of the aforementioned disadvantages. The object of the present invention is to overcome or improve at least one disadvantage of the prior art, or to provide a useful alternative.

[0009] According to a first aspect, the present invention provides a light generating system (“System”) comprising a first light generating device, a second light generating device, a light emitter, and a heat conductor. In an embodiment, the first light generating device may be configured to generate first device light having a first peak wavelength (λp1). Furthermore, the first light generating device may include a solid-state light source. Additionally or alternatively, in an embodiment, the second light generating device may be configured to generate second device light having a second peak wavelength (λp2). The first peak wavelength (λp1) and the second peak wavelength (λp2) are selected from the range of 430-490 nm. Furthermore, the second light generating device may include a solid-state light source. In an embodiment, the solid-state light source (of the first light generating device and / or the second light generating device) may be selected from laser diodes and superluminescent diodes. In another embodiment, the light emitter may include a light-emitting material. In such an embodiment, the light-emitting material may be configured to convert (i) at least a portion of the first device light received by the light-emitting material and (ii) at least a portion of the second device light received by the light-emitting material into light-emitting material light. Furthermore, the light emitter may include a first side, a second side, and a third side bridging the first and second sides. In embodiments, the heat conductor may include a heat-conducting material and may include a light-transmitting portion. Furthermore, in embodiments, a first side of the light emitter may be configured to receive light from a first light-generating device via the light-transmitting portion. Additionally or alternatively, a second side of the light emitter may be configured to receive light from a second light-generating device. Furthermore, one or more of a portion of the first side, a portion of the second side, and at least a portion of the third side may be configured to be in thermal contact with the heat conductor. In embodiments, the light generation system may be configured to generate system light including light from a luminescent material in a first operating mode of the light generation system (based on the conversion of at least a portion of the light from the first device and at least a portion of the light from the second device). In specific embodiments, the light generation system may further include a first dichroic mirror. In embodiments, the (optional) first dichroic mirror may be disposed between the first light-generating device and the light emitter. Specifically, in embodiments, the (optional) first dichroic mirror may be disposed upstream of the light emitter relative to the first light-generating device. Additionally, the (optional) first dichroic mirror may be configured to have a higher transmittance for the first device light than for the light from the luminescent material. Furthermore, in an embodiment, the (optional) first dichroic mirror may be configured to have higher reflectivity for luminescent material light than for first device light. Additionally, the system may include a second dichroic mirror disposed downstream of the second light-generating device and upstream of the luminescent element. Specifically, the second dichroic mirror may be configured to (i) reflect at least a portion of the second device light and transmit at least a portion of the luminescent material light, or (ii) transmit at least a portion of the second device light and reflect at least a portion of the luminescent material light.However, the light generating system can be configured to generate system light comprising luminescent material light in a first operating mode of the light generating system. In an embodiment, in the first operating mode, at least a portion of the luminescent material light generated by the first device light and at least a portion of the luminescent material light generated by the second device light can be emitted from a second side. In an embodiment, the system light can include contributions from at least a portion of the luminescent material light generated by the first device light (wherein the luminescent material light is emitted from the second side) and the luminescent material light generated by the second device light (wherein the luminescent material light is emitted from the second side). Therefore, in a specific embodiment, the present invention provides a light generation system comprising a first light generation device, a second light generation device, a light emitter, optionally a first dichroic mirror, optionally a second dichroic mirror, and a heat conductor, wherein: (A) the first light generation device is configured to generate first device light having a first peak wavelength (λp1); wherein the first light generation device includes a solid-state light source; wherein the second light generation device is configured to generate second device light having a second peak wavelength (λp2); wherein the second light generation device includes a solid-state light source; wherein the solid-state light source is selected from the group consisting of laser diodes and superluminescent diodes; (B) the light emitter includes a light-emitting material; wherein the light-emitting material is configured to convert (i) at least a portion of the first device light received by the light-emitting material and (ii) at least a portion of the second device light received by the light-emitting material into light-emitting material light; wherein the light emitter includes a first side, a second side, and a third side bridging the first side and the second side; (C) the heat conductor includes a heat-conducting material and includes a light-transmitting portion; (D) the first side of the light emitter is configured to be in a light-receiving relationship with the first light generation device via the light-transmitting portion; the second side of the light emitter is configured to be... The light source is positioned to receive light from the second light-generating device; and one or more of a portion of the first side and at least a portion of the third side are configured to be in thermal contact with a heat conductor; (E) (optional) a first dichroic mirror is disposed between the first light-generating device and the light-emitting body, wherein the first dichroic mirror is configured to have (i) a higher transmittance for light from the first device than for light from the luminescent material and (ii) a higher reflectance for light from the luminescent material than for light from the first device; (F) (optional) a second dichroic mirror is disposed downstream of the second light-generating device and upstream of the light-emitting body relative to the second light-generating device; wherein the second dichroic mirror is configured to (i) reflect at least a portion of the light from the second device and transmit at least a portion of the light from the luminescent material, or (ii) transmit at least a portion of the light from the second device and reflect at least a portion of the light from the luminescent material; and (G) the light-generating system is configured to generate system light including light from the luminescent material in a first operating mode of the light-generating system, wherein in the first operating mode, at least a portion of the light from the luminescent material generated by the first device light and at least a portion of the light from the luminescent material generated by the second device light are emitted from the second side.

[0010] This system provides a high-brightness light generation system for laser phosphors. Furthermore, it allows control over the spectral power distribution of the system light. It also provides high-brightness light in a relatively safe manner. Additionally, the system can be relatively compact. Thermal management of the light emitter can be provided. Besides high irradiance (or brightness), the system also provides high optical power, i.e., high optical power density of the source. Embodiments of this system can be more fail-safe due to the reflective configuration of the emitted light and device light (see also below). Specifically, in embodiments, the system can be configured to prevent direct laser beam emission from the system in the event of failure of the light emitter or optical elements (e.g., breakage, detachment, etc.). In summary, the advantage can be that the light emitter (e.g., phosphor) is irradiated from both sides. Therefore, compared to light generation systems that include a light emitter configured to be in a light-receiving relationship with (only) one light generation device (irradiated with the same radiant flux), light quenching can be reduced in the light generation system of the present invention. Therefore, in embodiments, the light generation system of the present invention can mitigate optical quenching. Furthermore, in the embodiments, the light generation system defined herein can be used as a (laser-phosphor) high-brightness light source.

[0011] As described above, a light generation system may include light generation devices. Specifically, in embodiments, the light generation system may include a first light generation device and a second light generation device. The light generation devices can be configured to generate device light. Therefore, the first light generation device can be configured to generate first device light. Furthermore, the (first) light generation device may include a light source (and the second light generation device may include a light source). Embodiments of the light source and light generation devices are generally described below and can be applied to both the first and second light generation devices.

[0012] The light source can be configured to generate light from the source. In embodiments, the device light can consist substantially of light from the source. In other embodiments, the device light can consist substantially of converted light from the source. In other embodiments, the device light can include (unconverted) light from the source and converted light from the source. The light from the source can be converted into light from the light-emitting material using a luminescent material and / or into upconverted light using an upconverter (see also below). The term "light generating device" can also refer to multiple light generating devices that can provide device light having substantially the same spectral power distribution. In (other) specific embodiments, the term "light generating device" can also refer to multiple light generating devices that can provide device light with different spectral power distributions. The term "light source" can, in principle, refer to any light source known in the art. In specific embodiments, the light source includes solid-state LED light sources (such as LEDs or laser diodes (or "diode lasers")). The term "light source" can also refer to multiple light sources, such as 2-2000 (solid-state) LED light sources. Thus, the term LED can also refer to multiple LEDs. Furthermore, the term "light source" in embodiments can also refer to so-called chip-on-board (COB) light sources. The term "COB" specifically refers to LED chips in the form of semiconductor chips that are neither packaged nor connected but directly mounted onto a substrate such as a PCB. Therefore, multiple light-emitting semiconductor light sources can be configured on the same substrate. In embodiments, a COB is a multi-LED chip configured together as a single lighting module.

[0013] A light source can have a light emanating surface. Referring to conventional light sources, such as light bulbs or fluorescent lamps, this can be the outer surface of a glass or quartz housing. For LEDs, it can be, for example, the LED die, or, when resin can be applied to the LED die, the outer surface of the resin. In principle, it can also be the termination of an optical fiber. The term emanating surface specifically refers to a portion of the light source from which light actually leaves or escapes from the light source. The light source is configured to provide a light beam. This light beam (and therefore) escapes from the light emanating surface of the light source. Similarly, light generating devices can include light emanating surfaces, such as end windows. Furthermore, similarly, light generating systems can include light emanating surfaces, such as end windows. The location where system light escapes from the light generating system can also be referred to as a light exit. This can be a light-transmitting window or opening (in the system). In embodiments, the light-transmitting window can be provided by optical components.

[0014] The term "light source" can refer to semiconductor light-generating devices, such as light-emitting diodes (LEDs), laser diodes, resonant cavity light-emitting diodes (RCLEDs), vertical-cavity laser diodes (VCSELs), edge-emitting lasers (EELs), photonic crystal surface-emitting lasers (PCSELs), and vertical-external-cavity surface-emitting lasers (VECSELs). The term "light source" can also refer to organic light-emitting diodes (OLEDs), such as passive matrix OLEDs (PMOLEDs) or active matrix OLEDs (AMOLEDs). In specific embodiments, the light source includes solid-state light sources (such as LEDs or laser diodes). In one embodiment, the light source includes an LED (light-emitting diode). The term "light source" or "solid-state light source" can also refer to superluminescent diodes (SLEDs). The term LED can also refer to multiple LEDs.

[0015] The light source can be configured to produce light with an optical axis (O) (beam shape) and spectral power distribution. In embodiments, the light source may include one or more frequency bands having bandwidths known to the laser.

[0016] The term "light source" can (therefore) refer to a light-generating element, such as a solid-state light source, or a package of a light-generating element, such as a solid-state light source, and one or more of elements comprising luminescent material and (other) optical devices (e.g., lenses, collimators). A light-converting element ("converter element" or "converter") can include an element comprising luminescent material. For example, a solid-state light source like 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 (e.g., a blue LED and a light-converter element) can also be a light source (but can also be referred to as a light-generating device). Thus, a white LED is a light source (but can also be referred to as a (white) light-generating device). In embodiments, the term "light source" can also refer to a combination of a light source (such as an LED) and a filter that can alter the spectral power distribution of the light generated by the light source. In particular, the term "light-generating device" can be used to describe a light source and additional (optical components), such as filters and / or beam-shaping elements. The phrases "different light sources" or "multiple different light sources" and similar phrases in embodiments can refer to multiple solid-state light sources selected from at least two different bins. Similarly, the phrases “the same light source” or “multiple identical light sources” and similar phrases in the embodiments may refer to multiple solid-state light sources selected from the same bin.

[0017] The terms “solid-state light source” or “solid-state material light source” and similar terms may specifically refer to semiconductor light sources, such as light-emitting diodes (LEDs), laser diodes, or superluminescent diodes.

[0018] The term "laser source" specifically refers to a laser. Such a laser can be configured to generate laser light having one or more wavelengths in the UV, visible, or infrared range, particularly wavelengths selected from the spectral wavelength range of 200-2000 nm, such as 300-1500 nm. The term "laser" also specifically refers to a device that emits light through a light amplification process based on stimulated emission of electromagnetic radiation.

[0019] Specifically, in embodiments, the term "laser" may refer to a solid-state laser. In specific embodiments, the term "laser" or "laser source" or similar terms refer to a laser diode (or diode laser). Therefore, in embodiments, the light source includes a laser source. In embodiments, the term "laser" or "solid-state laser" or "solid-state material laser" may refer to one or more of the following: 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:CaF2) laser, Er:YAG laser, erbium-doped and erbium-ytterbium co-doped glass laser, F-center laser, holmium YAG (Ho: Nd:YAG lasers, Nd:YAG lasers, NdCrYAG lasers, neodymium-doped calcium yttrium oxyborate Nd:YCa4O(BO3)3 or Nd:YCOB, neodymium-doped yttrium orthovanadate Nd:YVO4 lasers, neodymium-doped glass lasers (Nd:glass) lasers, neodymium YLF (Nd:YLF) solid-state lasers, promethium-147-doped phosphate glass (147Pm) 3+ Solid-state lasers (glass), ruby ​​lasers (Al2O3:Cr) 3+ ), Thulium YAG (Tm:YAG) laser, Titanium Sapphire (Ti:Sapphire; Al2O3:Ti) laser 3+ Lasers include trivalent uranium-doped calcium fluoride (U:CaF2) solid-state lasers, ytterbium-doped glass lasers (rod, plate / chip, and fiber type), ytterbium YAG (Yb:YAG) lasers, and Yb2O3 (glass or ceramic) lasers. For example, embodiments including second and third harmonic generation may include one or more of the following: F-center lasers, yttrium orthovanadate (Nd:YVO4) lasers, and promethium-147-doped phosphate glass (147Pm). 3+ (glass) and titanium sapphire (Ti: sapphire; AL2O3: Ti) 3+A laser. For example, such a light source can be used to produce blue light, taking into account the generation of second and third harmonics. In embodiments, the terms "laser," "solid-state laser," or "solid-state material laser" can refer to one or more semiconductor laser diodes, such as GaN, InGaN, AlGaInP, AlGaAs, InGaAsP, lead salts, vertical-cavity surface-emitting lasers (VCSELs), quantum cascade lasers, hybrid silicon lasers, etc. The laser can be combined with an up-converter to achieve a shorter wavelength. For example, upconversion can be achieved using some (trivalent) rare-earth ions, or using a nonlinear crystal. Alternatively, the laser can be combined with a down-converter, such as a dye laser, to achieve a longer wavelength.

[0020] Preferably, the light source is a light source (light source light) that emits light (light source light) during operation, including at least light with wavelengths selected from the range of 200-490 nm, particularly light with wavelengths selected from the range of 400-490 nm, and even more particularly light with wavelengths selected from the range of 440-490 nm. This light may be partially utilized by a luminescent material (see also below). Therefore, in a specific embodiment, the light source is configured to produce blue light.

[0021] As can be derived below, the term "laser source" can also refer to multiple (different or identical) laser sources. In a specific embodiment, the term "laser source" may refer to N (identical) laser sources. In an embodiment, N=2 or greater. In a specific embodiment, N may be at least 5, such as particularly at least 8. In this way, higher brightness can be obtained. In an embodiment, the laser sources may be arranged in a laser group (see also above). In an embodiment, the laser group may include heat dissipation and / or optics, such as lenses, to collimate the laser. Therefore, in an embodiment, the lasers in the laser group may share the same optics.

[0022] A laser source is configured to generate laser light (or "laser"). The light source can consist essentially of laser light. The light source can also include laser light from two or more (different or identical) laser sources. For example, laser light from two or more (different or identical) laser sources can be coupled into a light guide to provide a single beam of light comprising laser light from two or more (different or identical) laser sources. In a particular embodiment, the light source is therefore, in particular, collimated light. In yet another embodiment, the light source is, in particular, (collimated) laser light. In embodiments, the laser light can include one or more frequency bands having a bandwidth known to the laser. In a particular embodiment, the frequency bands can be relatively sharp lines, for example, having a full width at half maximum (FWHM) in the range of less than 20 nm at RT, such as equal to or less than 10 nm. Thus, the light source has a spectral power distribution (intensity on an energy scale as a function of wavelength) that can include one or more (narrow) frequency bands.

[0023] The beam of light (from the source) can be a focused or collimated beam of light from the (laser) source. The term "focused" specifically refers to convergence into a small spot. This small spot can be located at, or (slightly) upstream of, or (slightly) downstream of, the discrete converter region. In particular, focusing and / or collimation can be performed such that the cross-sectional shape of the beam (perpendicular to the optical axis) at the discrete converter region (on the side) is substantially no larger than the cross-sectional shape (perpendicular to the optical axis) of the discrete converter region (where the source light illuminates the discrete converter region). Focusing can be performed using one or more optical devices such as (focusing) lenses. In particular, two lenses can be applied to focus the laser source light. Collimation can be performed using one or more (other) optical devices, such as collimating elements, such as lenses and / or parabolic mirrors. In embodiments, the (laser) source beam can be relatively highly collimated, such as ≤2° (FWHM) in embodiments, more particularly ≤1° (FWHM), and most particularly ≤0.5° (FWHM). Therefore, ≤2° (FWHM) can be considered (highly) collimated source light. Optical devices can be used to provide (high) collimation (see also above).

[0024] The term "solid-state material laser" and similar terms can refer to solid-state lasers, such as solid-state lasers based on crystals or glasses doped with ions (e.g., transition metal ions and / or lanthanide ions), fiber lasers, photonic crystal lasers, semiconductor lasers such as vertical-cavity surface-emitting lasers (VCSELs), etc.

[0025] Instead of the term "solid-state light source," the term "semiconductor-based light source" can also be used. Therefore, the term "semiconductor-based light source" can refer to one or more of light-emitting diodes (LEDs), laser diodes, and superluminescent diodes. Thus, light-generating devices can include one or more of light-emitting diodes (LEDs), laser diodes, and superluminescent diodes.

[0026] A laser diode (or diode laser) can be a semiconductor device substantially similar to a light-emitting diode, wherein a diode directly pumped by a current can generate laser conditions at the junction of the diode. This is known to those skilled in the art.

[0027] Superluminescent diodes (SLDs) are known in the art. A SLD can be represented as a semiconductor device capable of emitting a broad spectrum of low-coherence light like an LED, while possessing brightness on par with a laser diode. Therefore, an SLD can particularly be a semiconductor light source in which spontaneously emitted light is amplified by stimulated emission in the active region of the device. This emission is referred to as "superluminescence." SLDs combine the high power and brightness of laser diodes with the low coherence of conventional LEDs. The low (temporal) coherence of the light source has the advantage of significantly reduced or invisible speckle, and the emitted spectral distribution is much wider than that of laser diodes, which are better suited for lighting applications. In particular, the spectral power distribution of a SLD can vary with changes in current. In this way, the spectral power distribution can be controlled. In specific embodiments, a solid-state light source may include a SLD. For example, in further specific embodiments, a solid-state light source may include a GaN-based SLD, or an InGaN-based SLD, or an AlGaN-based SLD.

[0028] In a specific embodiment, the device light may be blue light. The terms "blue light" or "blue emission" and similar terms may specifically refer to light with wavelengths in the range of about 430-490 nm (including some violet and cyan hues). In a specific embodiment, blue light may have a centroid wavelength in the range of 430-490 nm, for example, in the range of 440-490 nm. In a specific embodiment, the peak wavelength (λp) of the device light is selected from the blue wavelength range. In embodiments, the first light generating device and / or the second light generating device includes a light source selected from laser diodes and superluminescent diodes. Therefore, in particular, the first light generating device and / or the second light generating device may include a solid-state light source. More particularly, the device light may be a laser.

[0029] In an embodiment, the first light generating device may be configured to generate a first device light. Specifically, the first light generating device may be configured to generate the first device light along a first optical axis (O1). Typically, the optical axis (O) may be defined as the axis originating from the light generating device along which the device light propagates (on average) during operation of the light generating device.

[0030] Furthermore, the first device light may include a first peak wavelength (λp1). The term "peak wavelength," also denoted by λp, is known in the art and refers to the wavelength at which the emission spectrum of a light source reaches its maximum value; this value is expressed in nanometers (nm). It is a wavelength for which, after derivation of the emission spectrum, a derivative with respect to 0 is found, as shown by the formula... Let I(λ) represent the spectral energy density of the light emitted by the light-generating device as a function of wavelength λ. The peak wavelength (λp) can be determined, for example, under operating conditions. In an embodiment, the first device light may have a first peak wavelength (λp1) selected from the range of 200-490 nm, for example 400-490 nm, particularly 430-490 nm. Therefore, in a specific embodiment, the first light-generating device can be configured to generate device light having a peak wavelength (λp1) in the blue wavelength region.

[0031] Furthermore, the light generating system may include a second light generating device. The second light generating device may be configured to generate second device light. Specifically, the second light generating device may be configured to generate second device light along a second optical axis (O2). Therefore, in embodiments, the second light generating device may include a light source, particularly a solid-state light source (see above). In embodiments, the second light generating device may include the same light source as the first light generating device. However, in embodiments, the second light generating device may include a light source different from the light source of the first light generating device. Specifically, in embodiments, the second light generating device may include a light source selected from the group consisting of laser diodes and superluminescent diodes.

[0032] In one embodiment, the second device light may have a substantially the same spectral power distribution as the first device light. Specifically, in such an embodiment, the second peak wavelength (λp2) of the second device light may be equal to the first peak wavelength (λp1) of the first device light, λp1 = λp2. However, in other embodiments, the second light generating device may provide a second device light with a different spectral power distribution than the first device light. In such an embodiment, the second peak wavelength (λp2) may (still) be substantially equal to the first peak wavelength (λp1), λp1 = λp2. In another embodiment, the first peak wavelength (λp1) and the second first peak wavelength (λp2) may differ at a maximum of 10 nm, and more particularly, the first peak wavelength (λp1) and the second first peak wavelength (λp2) may differ at a maximum of 5 nm, for example, at a maximum of 2 nm.

[0033] However, in an alternative embodiment, the second device light may have a second peak wavelength (λp2) different from the first peak wavelength (λp1), where λp1 ≠ λp2. The difference in peak wavelengths (λp) between the first and second device lights is not necessary, but allows for further temperature control. Specifically, in an embodiment, the first device light is completely absorbed by the luminescent material. Therefore, in an embodiment, the first peak wavelength (λp1) may be closer to the excitation maximum of the luminescent material. However, the second device light can propagate from the second side to the first side and be reflected, thus providing a potentially larger absorption length. By selecting a peak wavelength further away from the excitation maximum, the absorption per distance can be lower, while the total absorption along the optical path can be relatively high because the optical path can propagate twice in reflection mode. Therefore, in a specific embodiment, the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by at least 10 nm, for example, more than 10 nm, particularly at least 15 nm. Furthermore, in an embodiment, the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by up to 80 nm, such as up to 50 nm, particularly up to 35 nm. In such embodiments, in particular, the first device light (including the first peak wavelength (λp1)) may have higher absorption per distance than the second device light (including the second peak wavelength (λp2)).

[0034] Therefore, in the embodiments, the luminescent material may have a wavelength-dependent absorption intensity (A), wherein the wavelength-dependent absorption intensity (A) may be defined by the molar extinction coefficient (ε) of the luminescent material at that wavelength. Furthermore, the luminescent material may have a maximum absorption wavelength (“excitation maximum”) λ. ex Therefore, the molar extinction coefficient (ε) at the maximum absorption wavelength λ ex The maximum value is found at λ. In the embodiment, λ is the maximum value. ex It can be equal to one or more of the first peak wavelength (λp1) and the second peak wavelength (λp2). Furthermore, λex It can be equal to either the first peak wavelength (λp1) or the second peak wavelength (λp2), particularly equal to the first peak wavelength (λp1). Furthermore, in embodiments, neither the first peak wavelength (λp1) nor the second peak wavelength (λp2) is equal to λ. ex However, in embodiments, the absorption intensity (A) of the luminescent material can be high at either the first peak wavelength (λp1) or the second peak wavelength (λp2). In a specific embodiment, the luminescent material can have y%≤A≤100%A for either the first peak wavelength (λp1) or the second peak wavelength (λp2). max The absorption intensity (A), and for the other of the first peak wavelength (λp1) and the second peak wavelength (λp2), it can have 20% ≤ A ≤ y% A max The absorption intensity (A). In this paper, A max It is a luminescent material (in λ) ex The maximum absorption intensity at the first peak wavelength (λp1) and the second peak wavelength (λp2) can be selected from the range of 70-95. Furthermore, in the embodiments, the absorption intensities of the luminescent material at the first peak wavelength (λp1) and the second peak wavelength (λp2) can differ by at least 5% Å. max For example, at least 10% A max Especially at least 15%A max Additionally or alternatively, in embodiments, the absorption intensities of the luminescent material at the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by up to 50% Å. max For example, at most 40%A max Especially in up to 30%A max In an embodiment, the absorption intensity (A) of the luminescent material can be higher at the first peak wavelength (λp1). For example, the luminescent material can have A = 90% at the first peak wavelength (λp1). max The absorption intensity, and has A=50%A at the second peak wavelength (λp2). max The absorption intensity. Furthermore, in specific embodiments, one of the following may be applicable: (a) the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by at least 10 nm, wherein the absorption intensity of the luminescent material at the first peak wavelength (λp1) may be higher than the absorption intensity at the second peak wavelength (λp2), and (b) the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by a maximum of 5 nm. In the embodiments, it was found that A max The wavelength can be the same as the excitation maximum in the excitation spectrum of the (luminescent material). Therefore, in the embodiment, "the absorption intensity of the luminescent material at the first peak wavelength (λp1) and the second peak wavelength (λp2) can differ by 50%." maxThe phrase "and similar phrases" can, for example, refer to a first peak wavelength (λp1) at the excitation maximum and a second peak wavelength (λp2) at which absorption (or excitation) is at 50% of the wavelength at the excitation maximum, or a first peak wavelength (λp1) at which absorption (or excitation) is at 90% of the wavelength at the excitation maximum and a second peak wavelength (λp2) at which absorption (or excitation) is at 40% of the wavelength at the same excitation maximum. Therefore, in embodiments, A can be proportional to the oscillator intensity of the luminescent material. Thus, in embodiments, A... λp1 / A λp2 It can be basically related to ε λp1 / ε λp2 The same applies, where "ε" refers to the extinction coefficient.

[0035] In embodiments, the light emitter may include a luminescent material. The term "luminescent material" specifically refers to a material capable of converting one or more of a first radiation, particularly UV radiation and blue radiation, into a second radiation. Typically, the first and second radiations have different spectral power distributions. Therefore, instead of the term "luminescent material," the terms "luminescent converter" or "converter" may also be used. Typically, the second radiation has a spectral power distribution at a wavelength greater than the first radiation, which is the case in so-called down-conversion. However, in specific embodiments, the second radiation has a spectral power distribution with intensity at a wavelength less than the first radiation, which is the case in so-called up-conversion. In embodiments, "luminescent material" may specifically refer to a material capable of converting radiation into, for example, visible light and / or infrared light. For example, in embodiments, the luminescent material is capable of converting one or more of UV radiation and blue radiation into visible light. The luminescent material may also convert radiation into infrared radiation (IR) in specific embodiments. Therefore, when excited by radiation, the luminescent material emits radiation. Typically, the luminescent material will be a down-converter, i.e., radiation with a smaller wavelength is converted into radiation with a larger wavelength (λ). ex <λ em Although in specific embodiments, the luminescent material may include an up-converter luminescent material, i.e., radiation with a larger wavelength is converted into radiation with a smaller wavelength (λ). ex >λ emIn embodiments, the term "luminescence" may refer to phosphorescence. In embodiments, the term "luminescence" may also refer to fluorescence. Instead of the term "luminescence," the terms "luminescent material light" or "emission" may also be used. Therefore, the terms "first radiation" and "second radiation" may refer to excitation radiation and emission (radiation), respectively. Similarly, the term "luminescent material" in embodiments may refer to phosphorescence and / or fluorescence. The term "luminescent material" may also refer to a variety of different luminescent materials. Examples of possible luminescent materials are shown below. Therefore, the term "luminescent material" in specific embodiments may also refer to a luminescent material composition.

[0036] Furthermore, in embodiments, the light emitter may include a variety of light-emitting materials. For example, the light emitter may include a first light-emitting material configured to produce (when illuminated) greenish-yellow light and a second light-emitting material configured to produce red light. Alternatively, in embodiments, the light emitter may include an additional light-emitting material configured to produce blue-green light.

[0037] In one embodiment, when the first device light and the second device light have different spectral power distributions, the first device light can result in a different spectral power distribution of the luminescent material light than the second device light. In such an embodiment, the spectral power distribution of the system light can also depend on the radiant flux of the first device light and the second device light. Specifically, in another embodiment, the correlated color temperature (CCT) of the system light can be tuned by adjusting the relative intensities of the first and second device lights. In this way, the light generating system can allow CCT control.

[0038] Therefore, in the embodiments, at least a portion of the first device light can be converted into (first) luminescent material light, and at least a portion of the second device light can be converted into (second) luminescent material light. Hereinafter, luminescent material light emitted from the second side of the luminescent body is referred to as "luminescent material light." This luminescent material light can therefore include contributions from the luminescent material light generated by the first device light (and may be referred to as "first luminescent material light") and / or contributions from the luminescent material light generated by the second device light (and may be referred to as "second luminescent material light"). When a single luminescent material is present and / or when the spectral power distributions of the first device light and the second device light are substantially the same, the first luminescent material light and the second luminescent material light will have (substantially) the same spectral power distribution. However, when the luminescent body comprises two or more different luminescent materials, and the spectral power distributions of the first device light and the second device light are different, the first luminescent material light and the second luminescent material light may (but not necessarily) have different spectral power distributions. Whether a difference exists may depend on the difference in spectral power distributions and the difference in the excitation spectra of the two or more different luminescent materials.

[0039] The term "phosphor" may also be used instead of "luminescent material." These terms are known to those skilled in the art.

[0040] In the embodiments, the luminescent material may be selected from garnet and nitride, particularly garnet and nitride 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, particularly silicates doped with divalent europium.

[0041] In a specific embodiment, the luminescent material includes The luminescent material is of the type wherein A in the embodiments comprises one or more of Y, La, Gd, Tb and Lu, particularly (at least) one or more of Y, Gd, Tb and Lu, and wherein B in the embodiments comprises one or more of Al, Ga, In and Sc. In particular, A may comprise one or more of Y, Gd and Lu, for example, particularly one or more of Y and Lu. Specifically, B may comprise one or more of Al and Ga, more particularly comprising at least Al, such as substantially entirely comprising Al. Therefore, a particularly suitable luminescent material is cerium-containing garnet material. Embodiments of garnet particularly include... Garnet, wherein A comprises at least yttrium or lutetium, and wherein B comprises at least aluminum. This garnet may be doped with cerium (Ce), praseodymium (Pr), or a combination of cerium and praseodymium; however, it is particularly doped with Ce. Specifically, 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), particularly up to about 20% B, more particularly up to about 10% B (i.e., the B ions are essentially composed of more than 90 mol% Al and less than 10 mol% of one or more of Ga, Sc, and In); B may particularly comprise up to about 10% gallium. In another variant, B and O may be at least partially replaced by Si and N. Element A may be particularly selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb), and lutetium (Lu). Furthermore, Gd and / or Tb are present specifically only in amounts up to about 20% of A. In a specific embodiment, the garnet luminescent material comprises , where x is equal to or greater than 0 and equal to or less than 1. The term ":Ce" indicates that a portion of the metal ions in the luminescent material (i.e., in garnet, a portion of the "A" ions) is replaced by Ce. For example, in In this case, a portion of Y and / or Lu is replaced by Ce. This is known to those skilled in the art. Ce will generally replace no more than 10% of A; typically, the Ce concentration is in the range of 0.1%–4% (relative to A), particularly 0.1%–2%. Assuming 1% Ce and 10% Y, the perfectly correct molecular formula could be... Ce in garnet is essentially or only in the trivalent state, as is known to those skilled in the art.

[0042] In the embodiments, the luminescent material (therefore) includes In a specific embodiment, up to 10% of BO can be replaced by Si-N. In this document, B in BO refers to one or more of Al, Ga, In, and Sc (and O refers to oxygen); in a specific embodiment, BO may refer to Al-O. As mentioned above, in a specific embodiment, x3 can be selected from the range of 0.001-0.04. In particular, such a luminescent material can have a suitable spectral distribution (see below), relatively high efficiency, relatively high thermal stability, and allow for high CRI (alternatively, in combination with light from other light sources as described herein). Therefore, in a specific embodiment, A can be selected from the group consisting of Lu and Gd. Alternatively or additionally, B may include Ga. Therefore, in an embodiment, the luminescent material comprises... Where Lu and / or Gd are available. Even more specifically, x3 is selected from the range of 0.001-0.1, where , and among them Furthermore, in specific embodiments, up to 1% of BO can be replaced by Si-N. In this document, percentages refer to molar numbers (as known in the art); see also, for example, EP3149108. In yet another specific embodiment, the luminescent material comprises… Where x1 + x3 = 1, and where For example, 0.001-0.1.

[0043] In a specific embodiment, the light-generating device may comprise only a luminescent material selected from garnets containing cerium. In a further specific embodiment, the light-generating device comprises a single type of luminescent material, such as... Therefore, in a specific embodiment, the light-generating device includes a light-emitting material, wherein at least 85% by weight, and even more particularly at least about 90 wt.%, such as at least about 95% by weight of the light-emitting material includes In this paper, A' comprises one or more elements selected from the group consisting of the lanthanides, and B' comprises one or more elements selected from the group consisting of Ga, In, and Sc, where x1 + x2 + x3 = 1, x3 > 0, and so on. , where y1+y2=1, where Specifically, 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.

[0044] In specific embodiments, A may specifically include at least Y, and B may specifically include at least Al. Alternatively or additionally, the luminescent material may include The luminescent material, wherein A includes one or more of Y, La, Gd, Tb, and Lu, such as including one or more of La and Y in the embodiments. In the embodiments, the luminescent material may alternatively or additionally include one or more of the following: and / or and / or and / or The luminescent material includes one or more of Ba, Sr, and Ca, particularly including at least Sr in the embodiments. Therefore, in the embodiments, the luminescent material may include materials selected from... and One or more materials forming the group. In these compounds, europium (Eu) is essentially or solely divalent and substitutes for one or more of the specified divalent cations. Typically, Eu will not be present in an amount greater than 10% of the cation; its presence relative to the substituted cation will be particularly in the range of about 0.5% to 10%, more particularly in the range of about 0.5% to 5%. The term ":Eu" indicates that a portion of the metal ion is substituted by Eu (in these embodiments, Eu is used to replace the metal ion). 2＋ (Alternative). For example, suppose It contains 2% Eu, and the correct molecular formula can be: Divalent europium often substitutes for divalent cations, such as the aforementioned divalent alkaline earth metal cations, particularly Ca, Sr, or Ba. Materials It can also be represented as MS:Eu, where M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes calcium or strontium, or calcium and strontium, more particularly calcium, in the compound. In this document, Eu is introduced and substitutes for at least a portion of M (i.e., one or more of Ba, Sr, and Ca). Furthermore, the material... It can also be expressed as M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); in particular, M includes Sr and / or Ba in the compound. In another specific embodiment, M consists of Sr and / or Ba (without regard to the presence of Eu), particularly 50-100%, more particularly 50-90% Ba and 50-0%, particularly 50-10% Sr, such as... (i.e., 75% Ba; 25% Sr). In this paper, Eu is introduced to replace at least a portion of M, i.e., one or more of Ba, Sr, and Ca. Similarly, the materials... It can also be expressed as M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca); particularly, M includes calcium or strontium, or calcium and strontium, more particularly calcium, in the compound. In this document, Eu is introduced and replaces at least a portion of M (i.e., one or more of Ba, Sr, and Ca). As is known to those skilled in the art, Eu in the above-described luminescent materials is substantially or only in a divalent state. The term "luminescent material" as used herein refers particularly to inorganic luminescent materials. Alternatively or additionally, other luminescent materials may also be applied. For example, quantum dots and / or organic dyes may be applied and alternatively embedded in a transmission matrix, such as polymers like PMMA or polysiloxanes.

[0045] Specifically, the luminescent material can be configured to convert (first and / or second) device light received by the luminescent material into luminescent material light. Therefore, the luminescent material can be configured in the system such that (first and / or second) device light can reach the luminescent material together with one or more optical elements. More specifically, at least a portion of the (first and / or second) device light can reach the luminescent material, such as at least 50% of the device light, at least 60% of the device light, and particularly at least 70% of the device light. In an embodiment, the luminescent material can be configured to convert first device light received by the luminescent material into first luminescent material light. Similarly, in an embodiment, the luminescent material can be configured to convert second device light received by the luminescent material into second luminescent material light. In such an embodiment, the first luminescent material light and the second luminescent material light can be collectively referred to as luminescent material light. Therefore, in an embodiment, the luminescent material light can be based on the conversion of at least a portion of the first device light and / or at least a portion of the second device light, more particularly based on the conversion of substantially all of the first device light and / or at least a portion of the second device light.

[0046] Specifically, the luminescent material is composed of a luminescent body. The luminescent body can be a layer, such as a self-supporting layer. The luminescent body can also be a coating. The luminescent body can also include a luminescent coating on a support (particularly a light-transmitting support in transmission mode, or a reflective support in reflection mode). In particular, the luminescent body can be substantially self-supporting. In embodiments, the luminescent material can be provided as a luminescent body, such as a luminescent single crystal, a luminescent glass, or a luminescent ceramic body. Such a body can be referred to as a "converter body" or a "luminescent body." In embodiments, the luminescent body can be a luminescent single crystal or a luminescent ceramic body. For example, in embodiments, cerium-containing garnet luminescent material can be provided as a luminescent single crystal or as a luminescent ceramic body. In other embodiments, the luminescent body can include a light-transmitting body in which the luminescent material is embedded. For example, the luminescent body can include a glass body in which the luminescent material is embedded. Alternatively, such glass can be luminescent. In other embodiments, the luminescent body can include a polymer in which the luminescent material is embedded.

[0047] The light-emitting body can have any shape. However, typically, a light-emitting body may include two substantially parallel faces defining the height of the light-emitting body. In embodiments, the two substantially parallel faces may define a first side face and a second side face of the light-emitting body. Furthermore, the light-emitting body may include a third side face (or “edge face”) bridging the first and second side faces. The edge face may be curved in one or two dimensions. The edge face may be planar. The light-emitting body may have a rectangular or circular cross-section, although other cross-sections are also possible, such as hexagonal, octagonal, etc. Therefore, the light-emitting body may have a circular cross-section, an elliptical cross-section, a square, or a non-square rectangle. In embodiments, the light-emitting body may have an n-polygonal cross-section, where 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 greater. Furthermore, in embodiments, the light-emitting body may include a (light-emitting body) axis (A1), wherein the (light-emitting body) axis (A1) (or “axis (A1)”) may be configured to be perpendicular to the first and second side faces and intersect the geometric center of the cross-section. The first and second side surfaces can also be referred to as "main surfaces" because they particularly provide the largest outer area of ​​the light-emitting body. Perpendicular to the aforementioned cross-sections can be another cross-section, which in embodiments may be rectangular. Therefore, the light-emitting body can, for example, have a cubic shape, a (non-cubic) cuboid shape, an n-sided prism shape with n at least 5 (such as a pentagonal prism, hexagonal prism), and a cylindrical shape. However, other shapes are also possible. In particular, the light-emitting body can have a cuboid shape, a cylindrical shape, or an n-sided prism shape, where n is 6 or 8.

[0048] In embodiments, the light-emitting body (or "body") has a lateral dimension of width or length (W1 or L1) or diameter (D1) and thickness or height (H1). In embodiments, (i) D1 ≥ H1 or (ii) W1 ≥ H1 and / or L1 ≥ H1. The light-emitting body may be transparent or light-scattering. In embodiments, the light-emitting body may comprise a ceramic luminescent material. In specific embodiments, L1 ≤ 10 mm, such as particularly L1 ≤ 5 mm, more particularly L1 ≤ 3 mm, and most particularly L1 ≤ 2 mm. In specific embodiments, W1 ≤ 10 mm, such as particularly W1 ≤ 5 mm, more particularly W1 ≤ 3 mm, and most particularly W1 ≤ 2 mm. In specific embodiments, H1 ≤ 10 mm, for example, particularly H1 ≤ 5 mm, more particularly H1 ≤ 3 mm, and most particularly H1 ≤ 2 mm. In specific embodiments, D1 ≤ 10 mm, such as particularly D1 ≤ 5 mm, more particularly D1 ≤ 3 mm, and most particularly D1 ≤ 2 mm. In a specific embodiment, the body may have a height (H1) in the range of 50 μm to 1 mm. Furthermore, the body may have a lateral dimension (width / diameter) in the range of 100 μm to 10 mm. In other specific embodiments, (i) D1 > H1 or (ii) W1 > H1 and L1 > H1. Specifically, the lateral dimensions, such as length, width, and diameter, are at least twice, such as at least five times, the height. In a specific embodiment, the light emitter 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 light source may be a (small) tile.

[0049] In embodiments, during the propagation of device light, particularly the first device light, through a light emitter, the optical power of the first device light may decrease due to absorption by the light emitter. The rate of decrease in the optical power of the first device light may depend on the first peak wavelength (λp1) and / or the luminescent material included in the light emitter. Specifically, in embodiments, the rate of decrease in the optical power of the first device light may depend on the absorption intensity of the luminescent material (included in the light emitter) at the first peak wavelength (λp1), the concentration of the luminescent material in the light emitter, and the height of the light emitter. Therefore, in embodiments, the concentration and absorption intensity (at the first peak wavelength (λp1)) of the luminescent material may define a first absorption height (H) of the light emitter. 1a First absorption height (H) 1a In particular, this can be the distance required for the first device light to propagate within the light-emitting body, allowing at least 98% of the first device light to be absorbed at the first peak wavelength (λp1) (assuming propagation parallel to the optical axis of the first device light, and especially assuming perpendicular illumination to the first device light). Therefore, the first absorption height (H...) 1aIn particular, it can be the distance that the first device light will need to travel within the light-emitting body to allow a maximum of 2% transmission of the first device light at the first peak wavelength (λp1) (assuming propagation parallel to the optical axis of the first device light, and especially assuming perpendicular illumination by the first device light). The height of the light-emitting body can also be expressed as "thickness".

[0050] In an embodiment, the first absorption height (H) 1a The height (H1) can be approximately equal to the first height. Therefore, in this embodiment, 0.7 H1≤H 1a ≤H1, such as 0.8 H1≤H 1a ≤H1, especially 0.9 H1≤H 1a ≤H1. In such embodiments, a first height (H1) can be selected such that when the light emitter is illuminated with the first device light, ≤10%, such as ≤5%, more particularly ≤2%, of the first device light can be transmitted through the light emitter (without being converted into (first) luminescent material light). Thus, in specific embodiments, the light emitter can have a first height (H1) as defined herein; wherein the first peak wavelength (λp1) and the light emitter can be selected such that at least 98% of the first device light at the first peak wavelength (λp1) is at a first absorption height (H1) of the light emitter. 1a It is absorbed on ) where H 1a ≤H1, especially 0.9 H1≤H 1a ≤H1.

[0051] Therefore, in an embodiment, the light emitter may have a first height (H1), wherein a first peak wavelength (λp1) and the light emitter are selected such that a maximum of 2% of the first device light at the first peak wavelength (λp1) is transmitted through the first absorption height H of the light emitter. 1a H 1a ≤H1, especially 0.9 H1≤H 1a ≤H1.

[0052] In embodiments, it may be advantageous that (substantially) no light from the first device is transmitted through the light emitter, such as ≤1%, particularly ≤0.1%. In this way, radiative damage to the second light-generating device can be reduced or substantially prevented. Furthermore, this configuration prevents (unconverted) light from the first device and / or the second device from escaping the light-generating system, thereby preventing damage to the system and / or consumers. Therefore, in embodiments, the first height (H1) can be particularly (substantially) greater than the first absorption height (H) of the light emitter. 1a ), 1.5 H 1a≤H1≤10 H 1a , such as 2 H 1a ≤H1≤8 H 1a Especially 3 H 1a ≤H1≤6 H 1a Furthermore, in a specific embodiment, the first peak wavelength (λp1) and the emitting element can be selected, such that 3 H 1a ≤H1≤6 H 1a Therefore, when H1 is substantially greater than H 1a At this time, virtually no first device light can transmit through the light emitter. Therefore, in such an embodiment, the system light may substantially exclude the first device light. Thus, in an embodiment, the first device light illuminating the first side essentially does not escape from the second side; i.e., "full conversion".

[0053] In another embodiment, it may be desirable for at least a portion of the first device light to be transmitted through the emitting element and propagate outside the system along with the emitting material light. Specifically, this can be an option when a second dichroic mirror is used, provided the first peak wavelength (λp1) is greater than the second peak wavelength (λp2). This then allows for the reflection or transmission of the emitting material light and the remaining first device light, as well as the transmission or reflection of the second device light, respectively. In particular, in such an embodiment, |λp1-λp2| ≥ 10 nm. For example, in such an embodiment, H1 ≤ H 1a ≤5 H1, such as 1.2 H1≤H 1a ≤4 H1, especially 1.5 H1≤H 1a ≤4 H1. Therefore, when H 1a When the light intensity is (essentially) greater than H1, the first device light can be transmitted through the light emitter. Therefore, in such an embodiment, the system light may include the first device light (if not (optically) filtered out). Thus, in an embodiment, the first device light illuminating the first side may escape from the second side; i.e., "partial conversion".

[0054] In an embodiment, the first side can be configured to receive light from the first light-generating device. Furthermore, in an embodiment, the first side can be configured to (at least partially) face the first light-generating device. In such an embodiment, the axis (A1) can have a first (illumination) angle (α1) with the first optical axis (O1) in the range of 0-60°, for example 0-45°, particularly 0-30°. In an embodiment, a smaller first angle (α1) can have the advantage of reducing reflection and / or scattering of light from the first device by the first side compared to a larger first angle (α1). However, in an embodiment, at a larger first angle (α1), the first height (H1) of the light emitter can be reduced because, in such an embodiment, the optical path length of the first device light in the light emitter can be increased.

[0055] In embodiments, the first optical axis (O1) may not be reflected and / or undergo a change of orientation between the first light generating device and the first side surface. In such embodiments, the light emanating surface of the first light generating device may be configured at an angle to the first side surface, wherein the angle may be equal to the first angle (α1). For purposes of explanation herein, it is assumed that the light emanating surface and the first side surface are configured to be perpendicular to the first optical axis (O1) and the axis (α1), respectively, although this is not required.

[0056] However, in embodiments, the first optical axis (O1) may have a (first optical path) angle (β1) (not equal to 90°) between the (first) portion of the first optical axis (O1) extending from the first light generating device and the (second) portion of the first optical axis (O1) intersecting the light emitter. This allows for greater flexibility in providing light generating systems with specific shapes and / or sizes, such as relatively thin light generating systems. In embodiments, the angle (β1) may be selected from the range of 60-90°. Further, in embodiments, the (optical path) angle (β1) may be selected from the range of 0-15°, such as 0-10°, particularly 0-5°. In specific embodiments, the first angle (α1) may be selected from the range of 0-30°, and the angle (β1) may be (substantially) 0°. Furthermore, in specific embodiments, the first angle (α1) may be (substantially) 0°, and the angle (β1) may be selected from the range of 60-90°. Similarly, in an embodiment, the axis (A1) may have a second (illumination) angle (α2) with the second optical axis (O2) selected from 0-30°, for example 0-20°, particularly 0-10°. Furthermore, in an embodiment, the second optical axis (O2) may have a (second optical path) angle (β2) as defined above. In an embodiment, the angle (β2) may be selected from the range of 60-90°. Furthermore, in an embodiment, the angle (β2) may be selected from the range of 0-15°.

[0057] In an embodiment, only a portion of the first side can be illuminated by the first device light. Therefore, in an embodiment, the (minimum) cross-sectional size of the light-transmitting portion can be smaller than the cross-sectional size of the light-emitting element. For example, in an embodiment, a first illumination area selected from 1-30% of the (total) area of ​​the first side can be illuminated by the first device light (assuming the first device beam is defined by its full width at half maximum). However, assuming the second device beam is defined by its full width at half maximum, only a portion of the second side can be illuminated by the second device beam. For example, in an embodiment, a second illumination area selected from 1-30% of the (total) area of ​​the second side can be illuminated by the second device light.

[0058] In embodiments, the light emitter can be configured to be in thermal contact with a heat conductor. For example, the light emitter can be configured to be in thermal contact with the heat conductor via at least a portion of a third side surface. Furthermore, in embodiments, the entire third side surface can be configured to be in thermal contact with the heat conductor. Thus, at least 60% of the third side surface can be configured to be in thermal contact with the heat conductor, such as at least 75%, particularly at least 90%, including 100%. In embodiments, the heat conductor can be configured around the light emitter. In such embodiments, the first and / or second sides can be (at least partially) exposed, while the third side surface can be substantially completely covered by the heat conductor.

[0059] In a specific embodiment, the third side may be in physical contact with a heat conductor. Furthermore, in an embodiment, a portion of the second side may be configured to be in thermal contact with a heat conductor. In a specific embodiment, 1-50% of the second side may be configured to be in thermal contact with a heat-conducting material. For example, 2-40%, particularly 5-30%. In an embodiment, at least a portion of the second side may be covered by a heat conductor, for example, in physical contact with a heat conductor.

[0060] Furthermore, in embodiments, a portion of the first side surface may be configured to be in thermal contact with a heat conductor (optionally via a first dichroic mirror (see below)). Specifically, in embodiments, at least 20% of the first side surface may be configured to be in thermal contact with a heat conductor, for example, at least 40%, particularly at least 60%. Additionally, up to 98%, for example, up to 95%, particularly up to 90%, of the first side surface may be configured to be in thermal contact with a heat conductor. In specific embodiments, the system may include a first dichroic mirror (see below) disposed between the first side surface and the heat conductor. In such embodiments, the first dichroic mirror may particularly comprise a thermally conductive material.

[0061] In an embodiment, the heat conductor may include a recess. The recess may be configured to accommodate at least a portion of the light-emitting element. Specifically, the recess may be configured to accommodate the light-emitting element on at least a portion of a first height (H1).

[0062] In an embodiment, the recess may be a through-hole. In a specific embodiment, this may be a cylindrical through-hole, a cubic through-hole, or a rectangular cube. In such an embodiment, the through-hole may have two openings, a second opening on a second side of the light-emitting element and a first opening on a first side of the light-emitting element, and these openings may have substantially the same size.

[0063] In other embodiments, the recess may be a hole in the heat conductor at a portion of its height, having a larger opening on the second side of the light-emitting element and a smaller opening on the first side of the light-emitting element. Such a hole at a portion of its height may, for example, have a cylindrical through-hole shape, a cubic shape, or a rectangular cubic shape, but it may also be conical.

[0064] In an embodiment, the recess may be configured to accommodate at least 50%, such as at least 65%, particularly at least 80%, of the first height (H1), including 100% of the light-emitting element. Furthermore, the heat conductor may be configured to accommodate at least 50%, such as at least 65%, particularly at least 80%, of the light-emitting element volume, including 100% of the light-emitting element volume. Therefore, in a specific embodiment, the light-emitting element may be completely disposed within the recess. Furthermore, in a specific embodiment, the light-emitting element may have a first height (H1); wherein the heat conductor may also include a recess configured to accommodate at least a portion of the light-emitting element, such that the light-emitting element is disposed within the recess at least a portion of the first height (H1); wherein at least a portion of the third side surface is configured to be in thermal contact with the heat conductor. Therefore, in an embodiment, the recess may have a height (H2) parallel to the first height (H1), wherein the height (H2) may be selected from 0.5. H1≤H2≤1.2 The range of H1, such as 0.65 H1≤H2≤1.1 H1, especially 0.8 H1≤H2≤1.05 H1. Furthermore, in embodiments, the recess may have lateral dimensions, such as width (W2) and length (L2). In embodiments, the width (W2) of the recess may be selected from the range of ≤10 mm, for example ≤5 mm, particularly ≤3 mm, and more particularly ≤2 mm. Additionally, in embodiments, the length (L2) of the recess may be selected from the range of ≤10 mm, for example ≤5 mm, particularly ≤3 mm, and more particularly ≤2 mm. In embodiments, the recess may have a circular cross-section perpendicular to the height (H2). In such embodiments, the recess may have an equivalent circular diameter (D2), wherein the diameter (D2) may be selected from the range of ≤10 mm, for example ≤5 mm, particularly ≤3 mm, and more particularly ≤2 mm. In specific embodiments, (i) D2 > H2 or (ii) W2 > H2 and L2 > H2. In particular, the lateral dimensions such as length (L2), width (W2), and diameter (D2) may be at least twice, such as at least five times, larger than the height (H2). In a specific embodiment, the recess has a length L2, a height H2, and a width W2, wherein H2 ≤ 0.5 L2 and H2 ≤ 0.5 W2. This configuration provides a relatively large thermal contact area between the light emitter and the heat conductor. This can have the advantage of extending the lifespan of the light emitter. Furthermore, in embodiments, the sides of the recess, particularly the sides of the recess in (thermal) contact with the light emitter, may include a reflective material. Specifically, the sides of the recess may include a reflective material configured to reflect at least a portion of the device light and / or the light emitted by the luminescent material. Specifically, the sides of the recess may be configured to reflect one or more of the following: (a) at least 70%, such as at least 80%, particularly at least 90%, including (substantially) all of the first device light; (b) at least 70%, such as at least 80%, particularly at least 90%, including (substantially) all of the second device light; and (c) at least 70%, such as at least 80%, particularly at least 90%, including (substantially) all of the luminescent material light received by the sides of the recess. This can reduce the amount of optical power lost due to absorption of light by the heat conductor, thereby improving the efficiency of the light generation system.

[0065] In this embodiment, the heat conductor may include a thermally conductive material. The thermally conductive material may, in particular, have a thermal conductivity of at least about 20 W / (m²). K), such as at least about 30W / (m K), for example, at least about 100 W / (m K), such as at least about 200 W / (m³) The thermal conductivity is approximately 10 W / (m²). In yet another specific embodiment, the thermally conductive material may in particular have a thermal conductivity of at least about 10 W / (m²). The thermal conductivity of K). In embodiments, the thermally conductive material may include one or more of the following: copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, aluminum silicon carbide, beryllium oxide, silicon carbide composite, aluminum silicon carbide, copper-tungsten alloy, copper-molybdenum carbide, carbon, diamond, and graphite. Alternatively or additionally, the thermally conductive material may include or be composed of alumina. In embodiments, the thermal conductor may include one or more of a heat sink, a heat diffuser, and a two-phase cooling device. In other embodiments, the thermal conductor may be configured to be in thermal contact with one or more of a heat sink, a heat diffuser, and a two-phase cooling device, and may transfer heat to such a heat sink, heat diffuser, or two-phase cooling device, for example, via another thermal conductor. If an element can exchange energy through heat treatment, it can be considered to be in "thermal contact" with another element. Therefore, the elements can be thermally coupled. In embodiments, thermal contact may be achieved through physical contact. In embodiments, thermal contact may be achieved via a thermally conductive material, such as a thermally conductive adhesive (or thermally conductive glue). Thermal contact can also be achieved between two elements when they are arranged relative to each other at a distance equal to or less than about 10 μm, although larger distances, such as up to 100 μm, are possible. The shorter the distance, the better the thermal contact. In particular, this distance can be 10 μm or less, such as 5 μm or less, such as 1 μm or less. This distance can be the distance between two corresponding surfaces of the respective elements. This distance can be an average distance. For example, two elements may be in physical contact at one or more, such as multiple locations, but at one or more, particularly multiple other locations, the elements are not in physical contact. This may be the case, for example, when one or both elements have rough surfaces. Therefore, in embodiments, the average distance between two elements can be 10 μm or less (although larger average distances are possible, such as up to 100 μm).

[0066] In one embodiment, the side of the light-emitting element may be in thermal contact with a sapphire layer (such as a sapphire body). This layer may be transmissive to the first device light, the second device light, and the light emitted by the light-emitting material. The sapphire layer may also provide thermal contact with a heat conductor. Therefore, the sapphire layer can be in thermal contact with both the light-emitting element and the heat conductor.

[0067] Furthermore, in embodiments, the heat conductor may include a light-transmitting portion. In this document, a light-transmitting portion may refer to an opening that begins on one side of the heat conductor and ends on the other side (particularly the opposite side).

[0068] The light-transmitting portion can be an opening in the heat conductor. Therefore, in embodiments, the light-transmitting portion can be formed by a recess, particularly a through-hole. In specific embodiments, the light-transmitting portion can be defined by a pinhole. Thus, in such embodiments, the light-transmitting portion can be defined by an opening (i.e., without solid material). In other embodiments, the light-transmitting portion can be defined by a (light-transmitting) window, such as a ceramic window, or a sapphire window, or other windows made of a light-transmitting material, particularly a light-transmitting material. In embodiments, the light-transmitting window can include light-transmitting ceramic or sapphire. Other light-transmitting materials are also possible, such as polymers, glass, etc. The use of a light-transmitting window can also prevent physical contact between the first side of the light-emitting element and the heat conductor.

[0069] Specifically, the light-transmitting portion can therefore be configured at the first side of the light-emitting body. Thus, in embodiments, the first device light propagating to the light-emitting body can first propagate through at least a portion of the light-transmitting portion, for example, through an opening (such as a pinhole) or a light-transmitting window. Therefore, in specific embodiments, the light-transmitting portion may include one or more of the following: (a) a pinhole, wherein a portion of the first side is configured to be in thermal contact with a heat conductor (through the pinhole); and (b) a light-transmitting window, wherein the light-transmitting window is configured downstream of the first light-generating device and upstream of the light-emitting body; wherein the light-transmitting window comprises transparent ceramic or sapphire.

[0070] Specifically, in embodiments, the light-transmitting portion can be considered as a "tunnel" passing through the heat conductor. Furthermore, in embodiments, the light-transmitting portion can have an equivalent circular diameter D. The equivalent circular diameter (or ECD) (or "circular equivalent diameter") of a two-dimensional shape (irregular shape) is the diameter of a circle with an equivalent area. For example, the equivalent circular diameter of a square with side a is 2a / SQRT(π). For a circle, the diameter D is the same as the equivalent circular diameter D. If a circle with diameter D in the xy-plane is deformed into any other shape without changing its area, then the equivalent circular diameter of that shape will be D. In embodiments, the equivalent circular diameter D of the light-transmitting portion, at least on one side of the heat conductor, can be selected from the range of 10-2000 μm, for example 20-1000 μm, particularly 50-500 μm. Furthermore, in embodiments, the light-emitting element can include an equivalent circular diameter (D1), where D ≤ 0.2. D1, such as D≤0.1 D1, especially D≤0.05 D1. Since the light-transmitting portion can have a (relatively) small equivalent circular diameter D, it can be used as a pinhole in an embodiment. Therefore, in a specific embodiment, the light-transmitting portion can be a pinhole. In such an embodiment, the light-transmitting portion can be particularly circular. However, in an embodiment, the light-transmitting portion can include a pinhole. A pinhole can be a small hole used in optical applications (e.g., photography, microscopy) to limit the amount of light transmitted through it. Therefore, in an embodiment, the light-transmitting portion, especially the pinhole, can be configured to block the transmission of light from the luminescent material through a first side. In a specific embodiment, the light-transmitting portion can therefore include a pinhole, and a portion of the first side can be configured to be in thermal contact with a heat conductor. Furthermore, in an embodiment, the light-transmitting portion, especially the pinhole, can be formed by a recess (on one side).

[0071] In an embodiment, the heat conductor can be configured such that the (first) side of the light emitter can face the light-transmitting portion of the heat conductor, particularly the side of the pinhole, especially the recess. Furthermore, in an embodiment, the light-transmitting portion can be configured downstream of the light-generating device (particularly the first light-generating device) and upstream of the light emitter side. Additionally, in an embodiment, the pinhole and recess can be configured such that device light (particularly the first device light) can enter the recess through the pinhole. Therefore, in a specific embodiment, the first side of the light emitter can be configured to be in a light-receiving relationship with the first light-generating device via the light-transmitting portion, i.e., the first device light can pass through the light-transmitting portion before irradiating the light emitter (the first side).

[0072] Therefore, in embodiments downstream of the first light-generating device, a light-transmitting portion comprising a light-transmitting material can be disposed downstream of the light-emitting element. In a specific embodiment, a light-transmitting portion comprising a light-transmitting material can be disposed downstream of the first light-generating device, and a first dichroic mirror can be disposed downstream of the light-transmitting portion, and the light-emitting element can be disposed downstream of the first dichroic mirror. In particular, in a further embodiment, the light-emitting element can be at least partially disposed in a recess in the heat conductor.

[0073] However, in one embodiment, a light-transmitting portion including an opening can be disposed downstream of the first light-generating device, and a light-emitting body can be disposed downstream of the light-transmitting portion. In a specific embodiment, a light-transmitting portion including an opening can be disposed downstream of the first light-generating device, and a first dichroic mirror can be disposed downstream of the light-transmitting portion, and a light-emitting body can be disposed downstream of the first dichroic mirror. In particular, in another embodiment, the light-emitting body can be at least partially disposed in a recess in the heat conductor.

[0074] However, in another embodiment, a light-transmitting portion including a pinhole can be configured downstream of the first light-generating device, and a light-emitting element can be configured downstream of this light-transmitting portion. In a specific embodiment, a light-transmitting portion including a pinhole can be configured downstream of the first light-generating device, and a first dichroic mirror can be configured downstream of the light-transmitting portion, and a light-emitting element can be configured downstream of the first dichroic mirror. In particular, in another embodiment, the light-emitting element can be at least partially configured in a recess in the heat conductor.

[0075] In an embodiment, the light emitter can emit luminescent material light in all directions after absorbing light from the first device and / or the second device. In an embodiment, at least a portion of the luminescent material light can be reflected by the side of the recess. However, in an embodiment, some luminescent material light can be emitted through the light-transmitting portion, particularly through the pinhole. In an embodiment, this configuration can reduce the optical power output of the light generating system. Therefore, in an embodiment, it may be desirable to reduce the emission of light from the luminescent material, particularly from the first side. Therefore, in an embodiment, the light generating system may include a (first) dichroic mirror disposed upstream (on the first side) of the light emitter relative to the first light generating device. In a specific embodiment, the first dichroic mirror can be configured to be parallel to and in physical contact with the first side of the light emitter. Furthermore, in an embodiment, the first dichroic mirror can be at least partially, for example (substantially) completely disposed in the recess. Specifically, in an embodiment, the first dichroic mirror can be at least partially disposed between the light-transmitting portion (particularly the pinhole) and the light emitter, wherein both the first dichroic mirror and the light emitter can be at least partially disposed in the recess. Therefore, in this embodiment, the first dichroic mirror can be configured downstream of the pinhole and upstream of the light-emitting element relative to the first light-generating device. In this way, the light from the first device can pass through the pinhole and the first dichroic mirror before being incident on the light-emitting element (its first side).

[0076] Furthermore, in a specific embodiment, the light-transmitting portion may include a pinhole; wherein the pinhole and the recess can be configured such that light from the first device can enter the recess through the pinhole; wherein a first dichroic mirror can be disposed in the recess and positioned downstream of the pinhole and upstream of the light-emitting element relative to the first light-generating device. This configuration prevents light from emitting through the pinhole. Additionally, this arrangement of the heat conductor, the first dichroic mirror, and the light-emitting element provides a stable configuration of the first dichroic mirror and the light-emitting element within the recess. Furthermore, this configuration promotes good (physical) contact between the first dichroic mirror and the light-emitting element, thereby reducing the amount of light emitted from the first side.

[0077] In an embodiment, a dichroic mirror can be an optical element configured to transmit light in a first wavelength range and reflect light in a second wavelength range. Specifically, in the first wavelength range, the transmission of light (through the dichroic mirror) can be greater than the reflection of light, while in the second wavelength range, the reflection of light can be greater than the transmission of light. Furthermore, the dichroic mirror can have a cutoff wavelength and / or a starting wavelength that separates the two wavelength ranges. The cutoff wavelength, in particular, separates the transmission range (shorter wavelength) from the reflection range (longer wavelength), while the starting wavelength, in particular, separates the reflection range (shorter wavelength) from the transmission range (longer wavelength). Specifically, the dichroic mirror can be configured to (a) transmit or reflect at least a portion of the device light, and (b) reflect or transmit at least a portion of the luminescent material light. Thus, the light-generating device (especially a light source) and the luminescent material can be selected such that the peak wavelength (λp) of the device light and the centroid wavelength (λc) of the luminescent material light are spectrally positioned on opposite sides of the cutoff / starting wavelength of the dichroic mirror disposed between the light-generating device and the luminescent material. Therefore, the peak wavelength (λp) of the device light and the centroid wavelength (λc) of the luminescent material light can be selected so that the dichroic mirror can essentially separate them in the spectrum and essentially transmit one and essentially reflect the other.

[0078] In a specific embodiment, the first dichroic mirror can be configured to transmit at least 70%, such as at least 80%, particularly at least 90%, including (substantially) all of the (first) device light received by the first dichroic mirror. Furthermore, in a specific embodiment, the first dichroic mirror can be configured to reflect at least 70%, such as at least 80%, particularly at least 90%, including (substantially) all of the luminescent material light received by the first dichroic mirror. Note that when the first dichroic mirror can be configured to transmit at least a portion of the device light, it can also be configured to reflect at least a portion of the luminescent material light. Therefore, in an embodiment, the first dichroic mirror can be configured to have a higher transmittance for the first device light than for the luminescent material light. Furthermore, in an embodiment, the first dichroic mirror can be configured to have a higher reflectance for the luminescent material light than for the first device light. As noted, with this configuration, the luminescent material light emitted from the first side can be reflected back to the light source and subsequently emitted from the second side. This can increase the optical power output of the light generation system. Additionally, this can prevent the luminescent material light from incident on the first light generation device, thereby increasing the lifetime of the first light generation device. Furthermore, this configuration allows for the provision of a first device light to the light source, wherein the first device light can have (substantially) equal intensities upstream and downstream of the dichroic mirror.

[0079] In this document, the terms “upstream” and “downstream” refer to the arrangement of articles or features relative to the propagation of light from a light-generating device (hereinforcingly a light source and / or a light emitter), wherein a second position in the beam closer to the light-generating device is “upstream” relative to a first position in the beam from the light-generating device, and a third position in the beam further away from the light-generating device is “downstream”.

[0080] In an embodiment, the light emitted by the luminescent material (which is emitted from a second side of the luminescent body) can be directed to the light outlet of the light generation system to provide system light including the luminescent material light. For this purpose, optics can be applied in the embodiment. Furthermore, in an embodiment, the luminescent material light can be combined with light from an additional source to provide system light with a specific color and / or intensity. For this purpose, optics can also be applied. Such embodiments are discussed herein.

[0081] In an embodiment, the light generating system may include a second dichroic mirror. In an embodiment, the second dichroic mirror may be the same as the first dichroic mirror. However, in an embodiment, the second dichroic mirror may be different from the first dichroic mirror. For example, the second dichroic mirror may have a different cutoff and / or onset wavelength compared to the first dichroic mirror. In an embodiment, the second dichroic mirror may be configured downstream of the second light generating device. Furthermore, the second dichroic mirror may be configured upstream of the light emitter relative to the second light generating device. Furthermore, in an embodiment, the second dichroic mirror may be configured at an angle relative to a side of the light emitter. Specifically, in an embodiment, the second dichroic mirror may be configured at a (second dichroic) angle selected from the range of 10-80°, for example 20-70°, particularly 30-60°, and more particularly 40-50° relative to a second side of the light emitter. In a specific embodiment, the second dichroic mirror may be configured at a (second dichroic) angle of 45° relative to the second side.

[0082] Furthermore, in embodiments, the second dichroic mirror can be configured to reflect or transmit at least a portion of the second device light. Additionally, the second dichroic mirror can be configured to transmit or reflect at least a portion of the luminescent material light. In specific embodiments, the second dichroic mirror can therefore be configured to reflect at least a portion of the second device light and transmit at least a portion of the luminescent material light. In other embodiments, the second dichroic mirror can be configured to transmit at least a portion of the second device light and reflect at least a portion of the luminescent material light. Specifically, the second dichroic mirror can be configured to (a) transmit or reflect at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the (second) device light, and (b) reflect or transmit at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the luminescent material light received by the second dichroic mirror. Therefore, in a specific embodiment, the light generating system may further include a second dichroic mirror, which is disposed downstream of the second light generating device and upstream of the light emitting body; wherein the second dichroic mirror may be configured to (i) reflect at least a portion of the light from the second device and transmit at least a portion of the light emitting material, or (ii) transmit at least a portion of the light from the second device and reflect at least a portion of the light emitting material. Thus, when the second dichroic mirror reflects a relatively larger amount of the second device light than the light emitting material, it can transmit a relatively larger amount of the light emitting material. Therefore, at least a portion of the light emitted from the second side of the light emitting body may have the second dichroic mirror in its optical path to the light outlet of the light generating system.

[0083] In embodiments where the second dichroic mirror can be configured to reflect at least a portion of the second device light and transmit at least a portion of the luminescent material light, the second (irradiation) angle (α2) between the (light-emitting body) axis A1 and the second optical axis O2 can be selected from the range of 0-10°, and the second optical path angle (β2) between the (first) portion of the second optical axis (O2) extending from the second light-generating device and the (second) portion of the second optical axis (O1) intersecting with the light-emitting body can be selected from the range of 60-90°. Furthermore, in embodiments where the second dichroic mirror can be configured to transmit at least a portion of the second device light and reflect at least a portion of the luminescent material light, the second angle (α2) can be selected from the range of 0-30°, and the angle (β2) can be selected from the range of 0-15°. This can have the advantage that, during operation of the light-generating system, any device light reflected and / or transmitted by the light-emitting body can be guided to a different direction than the luminescent material light provided by the light-emitting body. Therefore, such a light-generating system can prevent the light from the light-generating system from being emitted directly from the light outlet when one or more of the light-emitting body and the second dichroic mirror are damaged.

[0084] Similar to the description of the first device light above, the second device light can be completely or partially absorbed. When it is completely absorbed, the blue light used for the white system light can be provided by the remaining first device light, a light source that bypasses the first device light, a light source that reflects the second device light, a light source that bypasses the second device light, or another blue light source. The choice of light sources that substantially completely absorb and reflect the second device light is briefly discussed in the following paragraphs.

[0085] In embodiments, during the propagation of device light, particularly second device light, through a light emitter, the optical power of the second device light may decrease due to absorption by the light emitter. The rate of decrease in the optical power of the second device light may depend on the second peak wavelength (λp2) and / or the luminescent material included in the light emitter. Specifically, in embodiments, the rate of decrease in the optical power of the second device light may depend on the absorption intensity of the luminescent material (included in the light emitter) at the second peak wavelength (λp2), the concentration of the luminescent material in the light emitter, and the height of the light emitter. In this way, in embodiments, the concentration of the luminescent material and the absorption intensity (at the second peak wavelength (λp2)) can define a second absorption height (H) of the light emitter. 2a Second absorption height (H) 2a In particular, this can be the distance the second device light needs to travel within the light-emitting body to allow at least 98% absorption of the second device light at the second peak wavelength (λp2) (assuming propagation parallel to the optical axis of the second device light, especially assuming perpendicular illumination). Therefore, the second absorption height (H...) 2a In particular, it can be the distance required for the second device light to propagate within the light-emitting body, so as to allow a maximum of 2% transmission of the second device light at the second peak wavelength (λp2) (assuming propagation parallel to the optical axis of the second device light, and especially assuming perpendicular illumination to the second device light).

[0086] In the embodiment, the second absorption height (H) 2a The height (H1) can be approximately twice the second height because the light from the second device can be reflected back (at the first dichroic mirror). Therefore, in this embodiment, 0.7 H1≤0.5 H 2a ≤H1, for example, 0.8 H1≤0.5 H 2a ≤H1, especially 0.9 H1≤0.5 H 2a≤H1. In such an embodiment, a second height (H1) can be selected such that when the light emitter is illuminated with the second device light, ≤10%, for example ≤5%, more particularly ≤2%, of the second device light can be transmitted through the light emitter (without being converted into (second) luminescent material light). Therefore, in a specific embodiment, the light emitter can have a first height (H1) as defined herein; wherein a second peak wavelength (λp2) and the light emitter can be selected such that at least 98% of the second device light at the second peak wavelength (λp2) is at a second absorption height (H1) of the light emitter. 2a It is absorbed on the surface, of which 0.5 H 2a ≤H1, especially 0.9 H1≤0.5 H 2a ≤H1.

[0087] Furthermore, in the embodiments, the light emitter may have a first height (H1), wherein the second peak wavelength (λp2) and the light emitter may be selected such that a maximum of 2% of the second device light at the second peak wavelength (λp2) is transmitted through the second absorption height H of the light emitter. 2a , of which 0.5 H 2a ≤H1, especially 0.9 H1≤0.5 H 2a ≤H1.

[0088] In embodiments, it may be advantageous that (substantially) no second device light is transmitted through the light-emitting body, such as ≤1%, particularly ≤0.1%. In this way, radiative damage to the second light-generating device can be reduced or substantially prevented. Furthermore, such a configuration prevents (unconverted) second device light and / or second device light from escaping the light-generating system, thereby preventing damage to the system and / or consumers. Therefore, in embodiments, the first height (H1) can in particular be (substantially) greater than the second absorption height (H) of the light-emitting body. 2a )of half 1.5 H 2a ≤0.5 H1≤10 H 2a For example, 2 H 2a ≤0.5 H1≤8 H 2a Especially 3 H 2a ≤0.5 H1≤6 H 2aFurthermore, in a specific embodiment, a second peak wavelength (λp2) and a light emitter can be selected, such that 3 H 2a ≤0.5 H1≤6 H 2a .

[0089] Therefore, when H1 is essentially greater than 0.5 H 2a At this time, virtually no second device light can transmit through the light emitter. Therefore, in such an embodiment, the system light may substantially exclude second device light. Thus, in an embodiment, virtually no second device light illuminating the second side can escape from the second side (after reflection); i.e., "full conversion".

[0090] In other embodiments, it may be desirable that at least a portion of the second device light is not absorbed by the light-emitting body and propagates to the outside of the system along with the light from the luminescent material. In particular, in such embodiments, a second dichroic mirror may not be used, and specifically, substantially all of the first device light may be absorbed. For example, in such embodiments, H1 ≤ 0.5 H 2a ≤5 H1, for example, 1.2 H1≤0.5 H 2a ≤4 H1, especially 1.5 H1≤0.5 H 2a ≤4 H1. Therefore, when 0.5 H 2a When the light intensity is (substantially) greater than H1, the second device light will be emitted from the light source (after reflection). Therefore, in such an embodiment, the system light may include the second device light (if not (optically) filtered out). Thus, in an embodiment, the second device light illuminating the second side may escape from the second side (after reflection); i.e., "partial conversion".

[0091] Alternatively, when the light source is irradiated at a certain angle (i.e., the axis (A1) can have a second angle (α2) with the second optical axis (O2) which is not equal to 0°), the second device light can terminate in the system light.

[0092] Specifically, the light emitter can be configured in a reflection mode relative to the second device light. The light emitter can also be configured in a transmission mode relative to the first device light. Furthermore, in a specific embodiment, in a first operating mode of the light generation system, at least a portion of the luminescent material light generated by the first device light and at least a portion of the luminescent material light generated by the second device light can be emitted from a second side. Hereinafter, the term "reflection mode" can mean that when the (second) device light is reflected at the light emitter, it can have a direction overlapping with the direction in which the luminescent material light escapes from the system. Hereinafter, the term "transmission mode" can mean that when at least a portion of the (first) device light propagates to the light emitter in the same direction as it propagates directly upstream of the light emitter, it can have a direction overlapping with the direction in which the luminescent material light escapes from the system.

[0093] In an embodiment, the second light-transmitting portion, particularly the second light-transmitting portion including the (second) light-transmitting window, can be configured on the second side.

[0094] Therefore, in this invention, the light emitter can be configured (simultaneously) in a reflection mode (relative to the second light generating device) and (relative to the first light generating device) in a transmission mode.

[0095] In transmission mode, the absorption intensity of the emitting element at the peak wavelength (λp) of the incident device light can be high, and the (blue) (first) device can be substantially completely converted into (e.g., green and / or yellow) luminescent material light, which can be emitted from the second side of the emitting element. Furthermore, in reflection mode, the absorption intensity of the emitting element at the peak wavelength (λp) of the incident device light can be low, and the absorption of the (second) device light can be distributed over a longer optical path length by reflecting the (unconverted) (second) device light back to the emitting element at the (first) side of the emitting element via a dichroic mirror (or other reflector). In such an embodiment, thermal management can be easier because the absorption and conversion of light can propagate over a larger optical path length within the emitting element, thereby distributing the correspondingly generated heat over a larger volume within the emitting element. However, as mentioned above, in this embodiment, the spectral power distributions of the first and second device lights can also be substantially the same, meaning that the (wavelength-dependent) absorption intensities of the first and second device lights are substantially the same.

[0096] Furthermore, by extending the absorption and conversion of (especially the second) device light over a greater optical path length, the combination of transmission and reflection modes can allow for reduced light quenching within the luminescent body with similar optical power density to the (combined) device light. In this paper, the transmission mode may also be referred to as "transmission mode," and the reflection mode may be referred to as "reflection mode."

[0097] The above primarily discussed embodiments of a light generation system, which includes a first light generation device and a second light generation device. However, as noted herein, in embodiments, the light generation system may include multiple, such as multiple light generation devices. These embodiments will be discussed in more detail below.

[0098] In embodiments, the light generation system may include a laser array. Specifically, one or more first light generating devices, particularly multiple first light generating devices, may be configured in a laser array (or “laser block”), i.e., the first light generating devices may include laser diodes. Additionally or alternatively, one or more second light generating devices, particularly multiple second light generating devices, may be configured in the laser array, i.e., the second light generating devices may include laser diodes. The laser arrays may be different laser arrays, although configuration within the same laser array is also possible. In embodiments, the laser array (or “laser block”) may (therefore) be applied to the light generation system. The laser array can also be used to increase input power. Thus, in embodiments, the light generation system may include multiple light generating devices configured to generate device light, wherein two or more light generating devices may include laser light sources configured in a laser array.

[0099] Therefore, in specific embodiments, the light generation system may include a laser array, wherein the laser array may include one or more of the following: (i) a plurality of first light generating devices and (ii) a plurality of second light generating devices. Furthermore, in specific embodiments, the light generation system may include one or more laser arrays, wherein each of the one or more laser arrays may include one or more of the following: (i) a plurality of first light generating devices and (ii) a plurality of second light generating devices. In embodiments, the laser array may include heat sinks and / or one or more optical elements (e.g., lenses for collimating light). Furthermore, in embodiments, the light generating devices in the laser array may share the same optics. Therefore, the advantage of using laser arrays is that the light generation system may require fewer (separate) optical elements and heat sinks. In this way, the system can be more modular and robust.

[0100] Additionally or alternatively, in embodiments, the light generation system may include multiple light generation devices. In one embodiment, the multiple light generation devices may include a first light generation device. The multiple light generation devices providing the first light generation device may, in an embodiment, be a (first) laser group including multiple laser diodes (configured to generate light from the first device). However, in another embodiment, the multiple light generation devices may include a second light generation device. The multiple light generation devices providing the second light generation device may, in an embodiment, be a (second) laser group including multiple laser diodes (configured to generate light from the second device).

[0101] Specifically, in an embodiment, the light generation system may include a plurality of light generation devices, including a first light generation device and a second light generation device. In such an embodiment, the plurality of light generation devices may be configured to generate device light. Hereinafter, device light may include one or more of the first device light and the second device light, for example, particularly both the first device light and the second device light.

[0102] In embodiments, the light generating system can be configured to generate system light comprising (e.g., yellow) luminescent material light. However, it may be advantageous to generate system light comprising luminescent material light and a blue component to produce white system light. As described above, such white system light can be obtained from the incomplete absorption of the first device light. However, in such embodiments, the first device light can pass through the luminescent body, potentially leading to undesirable scattering and / or heat generation. Therefore, in embodiments, the system can be configured such that a portion of the device light bypasses the luminescent body. The portion of the device light that bypasses the luminescent body can be referred to as third light. In embodiments, the third light can be equal to the device light. However, alternatively, in embodiments, the third light can pass through one or more optical elements to generate a third light different from the device light. For example, the third light can pass through a diffuser element (see below) to generate diffused third light, wherein the diffused third light may in particular include diffused blue light. Furthermore, in embodiments, the (diffuse) third light can be mixed with the luminescent material light in the light-emitting system, wherein the combined luminescent material light and the third light can be included by the system light. Therefore, the light generating system can be configured to generate system light comprising light from luminescent materials and a third light in a first operating mode of the light generating system. Thus, in a specific embodiment, the system light may include diffused blue light. Color schemes other than blue-yellow are also possible, such as blue-green-red, blue-yellow-red, blue-green-yellow-red, etc., including optionally added cyan and / or orange. In particular, at least yellow and / or green light may be provided by one or more luminescent materials.

[0103] Furthermore, in specific embodiments, the light generation system may include multiple light generation devices, including a first light generation device and a second light generation device, wherein the multiple light generation devices are configured to generate device light; wherein the system is configured such that a portion of the device light bypasses the emitting element to provide a third light; wherein the light generation system is configured to generate light comprising luminescent material light and the third light in a first operating mode of the light generation system. As noted, such a configuration allows control over the spectral power distribution of the system light. In particular, in embodiments, such a configuration allows control over the correlated color temperature (CCT) of the system light, for example, by adjusting the amount of device light bypassing the emitting element. Furthermore, as indicated, the third light can be modified (individually) by one or more optical elements to further enhance the flexibility of the system in terms of system light characteristics. Therefore, in specific embodiments, the present invention can provide a high-brightness laser phosphor light source that uses the phosphor in both transmission and reflection modes, thereby mitigating light quenching and / or allowing CCT control.

[0104] In embodiments, the light generating system may include one or more optical elements (see also above). In embodiments, the one or more optical elements may include one or more of a dichroic beamsplitter, a polarizing beamsplitter, a semi-transparent mirror, a mirror, and one or more lenses. Furthermore, in embodiments, the light generating system may include a diffuser element. In embodiments, the dichroic beamsplitter may be the same as a first dichroic mirror and / or a second dichroic mirror. However, in embodiments, the dichroic beamsplitter may differ from the first dichroic mirror and / or the second dichroic mirror; for example, the dichroic beamsplitter may have different cutoff wavelengths and / or starting wavelengths.

[0105] Furthermore, in embodiments, the polarization beam splitter can be configured to transmit and / or reflect at least a portion of the incident light according to its polarization. Specifically, in embodiments, the polarization beam splitter can be configured to (a) transmit or reflect at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all incident light with p-polarization, and (b) reflect or transmit at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all incident light with s-polarization. Thus, the polarization beam splitter can convert a single (unpolarized) beam into two beams with orthogonal polarization.

[0106] Furthermore, in embodiments, the semi-transparent mirror can be configured to reflect a portion of the incident light and transmit the remainder of the incident light, regardless of wavelength and / or polarization. Specifically, the semi-transparent mirror can be configured to (1) transmit or reflect at least 50%, for example at least 60%, particularly at least 70%, of the incident light, and (2) reflect or transmit at most 50%, for example at most 40%, particularly at most 30%, of the incident light. In embodiments, the semi-transparent mirror may also be referred to as a “beam splitter.”

[0107] In an embodiment, the reflector may be configured to reflect at least 70%, such as at least 80%, particularly at least 90%, including (substantially) all incident light, regardless of wavelength and / or polarization, while preserving optical properties (e.g., polarization).

[0108] Furthermore, in embodiments, one or more optical elements may include one or more lenses. In such embodiments, one or more lenses may be configured to collimate, homogenize, focus, converge, diverge, and / or refract incident light. In embodiments, one or more lenses may include microlens arrays and / or Fresnel lenses. Furthermore, in embodiments, the light generating system may include a diffuser element. Hereinafter, the term "diffuser element" may refer to an element that diffuses or scatters light such that soft light can be transmitted and / or reflected. In embodiments, such a diffuser element may include a diffuser material, such as one or more selected from the group consisting of glass, polymer materials, fabrics, and gels. An example of a reflective diffuser element may be a metal-coated glass diffuser having a reflectivity of 95-98%. Also as described above, in embodiments, the system may include additional optical devices. The term "optical device" may in particular refer to one or more optical elements. Therefore, the terms "optical device," "optical element," and "optical component" may refer to the same item. The optical device may include one or more mirrors, reflectors, collimators, lenses, prisms, diffusers, phase plates, polarizers, diffraction elements, gratings, dichroic mirrors, or arrays of one or more of the above. In embodiments, the optical device may include one or more of beam expander optics and zoom lens optics. See further examples of the optical devices described above.

[0109] As indicated, in embodiments, the light generating system may include one or more optical elements. Specifically, the light generating system may include one or more first optical elements. The one or more first optical elements may in particular include one or more of a dichroic beamsplitter, a polarizing beamsplitter, a semi-transparent mirror, a reflector, and one or more lenses. Furthermore, in embodiments, the one or more first optical elements may be configured to split the first device light into at least two portions. In such embodiments, the first portion (of the first device light) may propagate to a light source. Additionally, the second portion (of the first device light) may bypass the light source to provide at least a portion of a third light. In another embodiment, the one or more first optical elements may be configured to split the second device light into at least two portions. In such embodiments, the first portion (of the second device light) may propagate to a light source. Additionally, the second portion (of the second device light) may bypass the light source to provide at least a portion of a third light. Therefore, in such embodiments, the one or more first optical elements may particularly include one or more of a dichroic beamsplitter, a polarizing beamsplitter, or a semi-transparent mirror to separate the first device light (or the second device light). In addition, one or more lenses or refractors may be used to guide the second portion of (the first device light and / or the second device light) around the light source, and alternatively, the beam of the second portion of (the first device light and / or the second device light) may be shaped.

[0110] In embodiments, based on power, at least 50%, for example, at least 60%, particularly at least 70% of the first device light (or second device light) can propagate to the light emitter. Furthermore, based on power, up to 95%, for example, up to 90%, particularly at least 80% of the first device light (or second device light) can propagate to the light emitter. Therefore, in embodiments, based on power, at least 5%, for example, at least 10%, particularly at least 20% of the first device light (or second device light) can bypass the light emitter. Furthermore, based on power, up to 50%, for example, up to 40%, particularly at least 30% of the first device light (or second device light) can bypass the light emitter. The device light bypassing the light emitter can be used as a (blue) component in the system light. However, in other embodiments, substantially all of the first device light (or second device light) can propagate to the light emitter. In embodiments, the device light can be split based on power such that the two portions have equal spectral power distributions, but are part of the intensity of the parent device light. Alternatively, the device light can be split based on spectral power such that the two portions have different spectral power distributions from the parent device light. For example, light with a longer wavelength (including the first percentage of the total power) can bypass the light source, while light with a shorter wavelength (including the remainder of the total power) can propagate to the light source.

[0111] Additionally, in embodiments, the plurality of light generating devices may further include a third light generating device. In embodiments, the third light generating device may be identical to one or more of the first and second light generating devices. However, in embodiments, the third light generating device may also be a different light generating device, such as light generating devices of different types, or light generating devices of the same type with different spectral power distributions. Furthermore, the third light generating device may be configured to generate third device light. In embodiments, the third device light may be substantially equal in spectrum to the first device light and / or the second device light. However, in embodiments, the third device light may be different in spectrum from the first and second device lights. For example, the first and second device lights may consist of blue light, and the third device light may consist of red light. In embodiments, one or more first optical elements may be configured to guide at least a portion of the third device light around a light source to provide at least a portion of the third light. Therefore, in embodiments, one or more first optical elements may specifically include one or more lenses or refractive mirrors to guide at least a portion of the third device light around a light source and to shape the beam of at least a portion of the third device light.

[0112] Therefore, in a specific embodiment, the light generating system may further include one or more first optical elements, wherein one or more of the following may be applicable: (a) one or more first optical elements may be configured to split first device light into at least two parts, wherein a first part will propagate to a light emitter and a second part will bypass the light emitter to provide at least a portion of a third light; (b) one or more first optical elements may be configured to split second device light into at least two parts, wherein a first part will propagate to a light emitter and a second part will bypass the light emitter to provide at least a portion of a third light; and (c) the plurality of light generating devices may further include a third light generating device, wherein the third light generating device may be configured to generate third device light, and wherein the one or more first optical elements may be configured to guide at least a portion of the third device light around the light emitter to provide at least a portion of the third light; wherein the one or more first optical elements may include one or more of a dichroic beamsplitter, a polarizing beamsplitter, a semi-transparent mirror, a mirror, and one or more lenses. Such a system allows for further control over the brightness and spectral power distribution of the system light. For example, only a small (second) portion of the light from the first and / or second devices may bypass the luminescent body, thereby increasing the luminescent material component in the system light. Additionally, a third light-generating device may be configured to further tune the color and / or intensity of the system light.

[0113] In embodiments, the light-generating system may further include a rotatable element, which may include a light-emitting element. Specifically, during operation of the light-generating system in a first operating mode, the rotatable element can rotate such that different portions of the light-emitting element are irradiated by device light over time. The rotatable element may be a phosphor wheel or a phosphor pillar. Furthermore, the rotatable element may include a thermally conductive material. In a specific embodiment, the rotatable element may include a heat conductor. The rotatable element facilitates thermal management of the light-emitting element and thus allows for higher intensity light from the emitting material and / or a longer lifespan for the light-emitting element.

[0114] As described above, in specific embodiments, the light generating system may further include dichroic elements, such as a first dichroic mirror and / or a second dichroic mirror, configured to transmit or reflect device light and configured to reflect or transmit luminescent material light. The dichroic element may be an embodiment of, for example, the color-separating element described in US7070300, which is incorporated herein by reference. In particular, the color-separating element may be selected from the group consisting of dichroic mirrors, dichroic cubes, and diffractive optical elements. Alternatively, a hologram may be used to provide the color-separating element. In particular, the dichroic element may be a dichroic mirror or a reflector.

[0115] Therefore, in a light generation system including a light source, similar to a light generation device (e.g., including a solid-state light source) that emits light with a first wavelength range along a first optical path (or "beam path"), a wavelength conversion element (e.g., a light emitter) can be configured in the first optical path. In embodiments, this wavelength conversion element can be physically separated from the light source. Furthermore, this wavelength conversion element can be configured to convert at least a portion of the light with the first wavelength range into light with a second wavelength range along a second optical path. In particular, in embodiments, a color separation element, especially a dichroic element, can be disposed between the light source and the wavelength conversion element. In embodiments, the color separation element can be configured to substantially prevent all light with the second wavelength range from incident on the light source. Therefore, such a color separation element in embodiments can be configured to (a) transmit at least a portion of the light with the first wavelength range and reflect at least a portion of the light with the second wavelength range, or (b) reflect at least a portion of the light with the first wavelength range and transmit at least a portion of the light with the second wavelength range.

[0116] In an embodiment, the first dichroic mirror may be configured to separate blue light from light with a larger wavelength (such as one or more selected from green, yellow, and red light). Alternatively or additionally, in an embodiment, the second dichroic mirror may be configured to separate blue light from light with a larger wavelength (such as one or more selected from green, yellow, and red light).

[0117] As described above, the brightness and / or spectral power distribution of the light generating system can be controlled and / or adjusted. In one embodiment, such adjustment can be achieved by adjusting the power input / output of either of the light generating devices. However, in another embodiment, the spectral power distribution can be adjusted, in particular, by changing the position and / or number of the first optical elements. For example, the first device light in the above configuration can be separated using a first semi-transparent mirror configured to reflect 30% of the first device light to bypass the emitting element. Then, upon receiving a signal from the control system, the first semi-transparent mirror can be moved out of the first device light beam and simultaneously replaced by a second semi-transparent mirror configured to reflect 10% of the first device light to bypass the emitting element. This can increase the luminescent material light component in the system light, thereby changing the spectral power distribution of the system light.

[0118] Therefore, in embodiments, the light generating system may include a control system. Specifically, in embodiments, the light generating system may further include a control system, wherein the control system may be configured to individually control a first device light generated by a first light generating device and a second device light generated by a second light generating device. Furthermore, in specific embodiments, the control system may be configured to control one or more of the color point, correlated color temperature, and color rendering index of the system light. Therefore, the control system may be configured to adapt to the spectral power distribution of the system light. The terms "color point," "correlated color temperature," and "color rendering index" are known to those skilled in the art. The term "control" and similar terms specifically refer to at least determining the behavior of an element or supervising the operation of an element. Therefore, "control" and similar terms here may, for example, refer to applying behavior to an element (determining behavior or supervising the operation of an element), such as measuring, displaying, actuating, turning on, moving, changing temperature, etc. In addition, the term "control" and similar terms may also include monitoring. Therefore, the term "control" and similar terms may include applying behavior to an element, and may also include applying behavior to an element and monitoring the element. Control of the element can be accomplished using a control system, which may also be referred to as a "controller." The control system and components can therefore be functionally coupled, at least temporarily or permanently. The component may include the control system. In embodiments, the control system and components may not be physically coupled. Control can be performed via wired and / or wireless control. The term "control system" can also refer to multiple different control systems, particularly those functionally coupled, where, for example, one control system may be a master control system, while one or more other control systems may be slave control systems. The control system may include or may be functionally coupled to a user interface.

[0119] The control system can also be configured to receive and execute commands from a remote control. In an embodiment, the control system can be controlled via an app on a device, such as a portable device like a smartphone or iPhone, tablet, etc. Therefore, the device is not necessarily coupled to the lighting system, but can be (temporarily) functionally coupled to the lighting system.

[0120] Therefore, in this embodiment, the control system can also be configured to be controlled by an app on a remote device. In such an embodiment, the control system of the lighting system can be a slave control system or controlled in a slave mode. For example, the lighting system can be identified by a code, specifically a unique code for each individual lighting system. The control system of the lighting system can be configured to be controlled by an external control system that accesses the lighting system based on knowledge of the (unique) code (input via a user interface with optical sensors, e.g., a QR code reader). The lighting system may also include means for communicating with other systems or devices, such as based on Bluetooth, Thread, Wi-Fi, LiFi, ZigBee, BLE, or WiMAX or other wireless technologies.

[0121] A system, apparatus, or device may perform actions in a “mode,” “operating mode,” “mode of operation,” or “operational mode.” The term “operational mode” may also refer to “control mode.” Similarly, in a method, actions, stages, or steps may be performed in a “mode,” “operating mode,” “mode of operation,” or “operational mode.” This does not preclude the system, apparatus, or device from being adapted to provide another control mode or multiple other control modes. Likewise, this does not preclude the possibility of performing one or more other modes before and / or after performing a particular mode.

[0122] However, in embodiments, the control system may be available and is adapted to provide at least a control mode. If other modes are available, the selection of these modes can be performed, in particular, via a user interface, although other options, such as performing modes based on sensor signals or (time) schemes, are also possible. In embodiments, an operating mode may also refer to a system, device, or apparatus that can only operate in a single operating mode (i.e., "on," without further tunability).

[0123] Therefore, in this embodiment, the control system can perform control based on one or more of the following: input signals from the user interface, sensor signals (from sensors), and timers. The term "timer" can refer to a clock and / or a predetermined timing scheme.

[0124] Light generating systems can be, for example, part of or applicable to, any of the following: office lighting systems, home application systems, shop lighting systems, residential lighting systems, accent lighting systems, spotlighting systems, theater lighting systems, fiber optic application systems, projection systems, self-illuminating display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, directional 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. Light generating systems (or luminaires) can also be, for example, part of or applicable to, optical communication systems or disinfection systems.

[0125] Therefore, in another aspect, the present invention can also provide a lamp or luminaire comprising a light-generating system as defined herein. The luminaire may further include a housing, optical elements, a light-transmitting grating, etc. The lamp or luminaire may also include a housing surrounding the light-generating system. The lamp or luminaire may include a light window or housing opening in the housing through which system light can escape from the housing. In yet another aspect, the present invention can also provide a projection device comprising a light-generating system as defined herein. In particular, a projection device, or “projector” or “image projector,” can be an optical device that projects an image (or moving image) onto a surface such as a projection screen. The projection device may include one or more light-generating systems as described herein. Therefore, in one aspect, the present invention can also provide a lighting device selected from the group consisting of lamps, luminaires, projector devices, disinfection devices, photochemical reactors, and optical wireless communication devices, comprising a light-generating system as defined herein. The lighting device may include a housing or carrier configured to house or support one or more elements of a light-generating system. For example, in an embodiment, the lighting device may include a housing or support configured to house or support one or more of the following: a plurality of light generating devices, a heat conductor, a light emitter, and one or more first optical elements.

[0126] In addition to the terms "lighting equipment" or "lighting system" and similar terms, the terms "light generating equipment" or "light generating system" (and similar terms) may also be used. A lighting equipment or lighting system may be configured to generate equipment light (or "lighting equipment light") or system light ("or lighting system light").

[0127] The term "white light" and similar terms used herein are known to those skilled in the art. It can particularly refer to light having a correlated color temperature (CCT) between approximately 1800K and 20000K, for example, between 2000 and 20000K, especially between 2700 and 20000K, and for general illumination particularly to light having a CCT in the range of approximately 2000-7000K, for example, between 2700K and 6500K. In embodiments, for example for backlighting purposes or for other purposes, the correlated color temperature (CCT) can particularly be in the range of approximately 7000K and 20000K. Furthermore, in embodiments, the correlated color temperature (CCT) is particularly within approximately 15 SDCM (standard deviation of color matching) from the BBL (blackbody track), particularly within approximately 10 SDCM from the BBL, and even more particularly within approximately 5 SDCM from the BBL.

[0128] The terms “visible,” “visible light,” or “visible emission,” and similar terms refer to light having one or more wavelengths in the range of about 380-780 nm. In this document, UV specifically refers to wavelengths selected from the range of 190-380 nm, for example, 200-380 nm. The terms “light” and “radiation” are used interchangeably herein unless the context clearly indicates that the term “light” refers only to visible light. Therefore, the terms “light” and “radiation” can 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.

[0129] The terms "violet light" or "violet emission" and similar terms may particularly refer to light with wavelengths in the range of about 380-440 nm. In a specific embodiment, violet light may have a centroid wavelength in the range of 380-440 nm. The terms "blue light" or "blue emission" and similar terms may particularly refer to light with wavelengths in the range of about 440-490 nm (including some violet and cyan hues). In a specific embodiment, blue light may have a centroid wavelength in the range of 440-490 nm. The terms "green light" or "green emission" and similar terms may particularly refer to light with wavelengths in the range of about 490-560 nm. In a specific embodiment, green light may have a centroid wavelength in the range of 490-560 nm. The terms "yellow light" or "yellow emission" and similar terms may particularly refer to light with wavelengths in the range of about 560-590 nm. In a specific embodiment, yellow light may have a centroid wavelength in the range of 560-590 nm. The terms "orange light" or "orange emission" and similar terms may particularly refer to light with wavelengths in the range of about 590-620 nm. In a specific embodiment, orange light may have a centroid wavelength in the range of 590-620 nm. The terms "red light" or "red emission" and similar terms may particularly refer to light with wavelengths in the range of about 620-750 nm. In a specific embodiment, red light may have a centroid wavelength in the range of 620-750 nm. The terms "cyan light" or "cyan emission" and similar terms may particularly refer to light with wavelengths in the range of about 490-520 nm. In a specific embodiment, cyan light may have a centroid wavelength in the range of 490-520 nm. The terms "amber light" or "amber emission" and similar terms may particularly refer to light with wavelengths in the range of about 585-605 nm, for example, about 590-600 nm. In a specific embodiment, amber light may have a centroid wavelength in the range of 585-605 nm. The phrase “light having one or more wavelengths within a wavelength range” and similar phrases can specifically indicate that the indicated light (or radiation) has a spectral power distribution with one or more intensities at least within those one or more wavelengths in the indicated wavelength range. For example, a blue emitting solid-state light source would have a spectral power distribution with intensities at one or more wavelengths in the wavelength range of 440-495 nm.

[0130] The term "centroid wavelength," also denoted as λc, is known in the art and refers to the wavelength in which half of the light energy is at a shorter wavelength and half at a longer wavelength; this value is expressed in nanometers (nm). It is the wavelength at which the integral of the spectral power distribution is divided into two equal parts, as shown in the formula λc = Σλ The summation is represented by I(λ) / (ΣI(λ)), where the summation is over the wavelength range of interest, and I(λ) is the spectral energy density (i.e., the integral of the product of wavelength and intensity over the emission band normalized to the integral intensity). The centroid wavelength can be determined, for example, under operating conditions. Attached Figure Description

[0131] Embodiments of the invention will now be described by way of example only, with reference to the accompanying schematic diagrams, wherein corresponding reference numerals indicate corresponding parts, and in the drawings:

[0132] Figure 1 An embodiment of the light-generating system is schematically depicted;

[0133] Figure 2 schematically depicts an embodiment of the first dichroic mirror (Figure 2a), the heat conductor (Figure 2b), and the light emitter (Figure 2c);

[0134] Figure 3 An embodiment of the first device light and the second device light is schematically depicted;

[0135] Figure 4 schematically depicts embodiments of multiple light-generating devices;

[0136] Figure 5 schematically depicts an embodiment of the light generation system; and

[0137] Figure 6 Several embodiments of the lighting device are schematically depicted.

[0138] The diagram does not need to be drawn to scale. Detailed Implementation

[0139] Figure 1 An embodiment of a light generation system 1000 is schematically depicted, including a first light generation device 110, a second light generation device 120, a light emitter 210, a first dichroic mirror 521, and a heat conductor 500. As shown, the first light generation device 110 can be configured to generate a first device light 111. The first device light 111 may have a first peak wavelength λp1 (see...). Figure 3Furthermore, the first device light 111 may have a first optical axis O1, defined as originating from the first light generating device 110 and having a direction determined by the propagation direction of the first device light 111 between the first light generating device 110 and a first optical element disposed downstream of the first light generating device 110. Additionally, the first light generating device 110 may include a light source, such as, in particular, a solid-state light source. In an embodiment, the laser group 1100 may include a plurality of first light generating devices 110. Conversely, the second light generating device 120 may be configured to generate a second device light 121. The second device light 121 may have a second peak wavelength λp2. Additionally, the second device light may have a second optical axis O2. In an embodiment, the second light generating device 120 may include a light source, such as, in particular, a solid-state light source. In another embodiment, the laser group 1100 may include a plurality of second light generating devices 120. The solid-state light source (of the first light generating device 110 and the second light generating device 120) may be selected from the group consisting of laser diodes and superluminescent diodes. In a specific embodiment, the light generation system 1000 may therefore include a laser array 1100. In such an embodiment, the laser array 1100 may include one or more of (i) a plurality of first light generation devices 110 and (ii) a plurality of second light generation devices 120. Furthermore, in an embodiment, the light generation system may include a plurality of light generation devices 100, which include first light generation devices 110 and second light generation devices 120. In such an embodiment, the plurality of light generation devices 100 may be configured to generate device light 101. Therefore, in an embodiment, device light 101 may include one or more of first device light 111 and second device light 121.

[0140] The light emitter 210 may include a light-emitting material 200. The light-emitting material 200 may be configured to convert at least a portion of the first device light 111 received by the light-emitting material 200 into light-emitting material light 201. Furthermore, the light-emitting material 200 may be configured to convert at least a portion of the second device light 121 received by the light-emitting material 200 into light-emitting material light 201. In a specific embodiment, the light-emitting material may be configured to convert at least a portion of the second device light 121 received by the light-emitting material 200 into second light-emitting material light 201', wherein the second light-emitting material light 201' may have a different spectral power distribution than the light-emitting material light 201. However, the second light-emitting material light 201' may be equal to the light-emitting material light 201. In an embodiment, the light emitter 210 may include a first side 211, a second side 212, and a third side 213 bridging the first side 211 and the second side 212. Furthermore, the light emitter 210 may include an axis A1, which is defined as the axis along which the light-emitting material light 201 propagates (averagely) during operation of the light generation system 1000. Specifically, axis A1 can refer to the propagation direction of the light 201 of the light-emitting material between the light emitter 210 and the first optical element 610 disposed downstream of the light emitter 210.

[0141] Furthermore, the heat conductor 500 may include a heat-conducting material 503. Additionally, the heat conductor 500 may include a light-transmitting portion 501. In an embodiment, the first side 211 of the light emitter 210 may be configured to receive light from the first light-generating device 110 via the light-transmitting portion 501. In such an embodiment, as... Figure 1 As shown, the first light-generating device 110 can be configured to face the first side 211. Specifically, in such an embodiment, the first optical axis O1 can have a first angle α1 with the axis A1, where α1 can be selected from the range of 0-30°. Similarly, the second side 212 of the light-emitting body 210 can be configured to be in a light-receiving relationship with the second light-generating device 120. In this case, the second light-generating device 120 can be configured to face the second side 212, as shown. Figure 1 As shown. In such an embodiment, the second optical axis O2 may have a second angle α2 with the axis A1, wherein α2 may be selected from the range of 0-30°. Furthermore, one or more of a portion of the first side surface 211 and at least a portion of the third side surface 213 may be configured to be in thermal contact with the heat conductor 500. Specifically, at least 20% of the first side surface 211 and at least 60% of the third side surface 213 may be configured to be in thermal contact with the heat conductor 500.

[0142] A first dichroic mirror 521 may be disposed between the first light generating device 110 and the light emitter 210. Specifically, the first dichroic mirror may be disposed upstream of the light emitter 210 relative to the first light generating device 110. In an embodiment, the first dichroic mirror 521 may be configured to have (i) a higher transmittance for the first device light 111 than for the light emitting material light 201, and (ii) a higher reflectance for the light emitting material light 201 than for the first device light 111.

[0143] In an embodiment, the light generating system 1000 may include a second dichroic mirror 602, which is disposed downstream of the second light generating device 120 and upstream of the light emitter 210 relative to the second light generating device 120. The second dichroic mirror 602 may be configured to (i) reflect at least a portion of the second device light 121 and transmit at least a portion of the light emitting material light 201, or (ii) transmit at least a portion of the second device light 121 and reflect at least a portion of the light emitting material light 201. Specifically, the second dichroic mirror 602 may be configured to (i) transmit or reflect at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the second device light 121, and (ii) reflect or transmit at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the light emitting material light 201 received by the second dichroic mirror 602. Figure 1 In the embodiment shown, the second dichroic mirror 602 is configured to transmit at least a portion of the second device light 121 and reflect at least a portion of the luminescent material light 201.

[0144] In a first operating mode, the light generating system 1000 can be configured to generate system light 1001 comprising light emitting material 201. The system light 1001, particularly the light emitting material 201, can be guided to the light outlet 2000 of the light generating system 1000 via one or more first optical elements 610 (see below). Specifically, the light emitting material 201 can be guided to one side of the light emitter 210, particularly the second side 212, before being guided to the light outlet 2000. Furthermore, the light-transmitting portion 501 can include a pinhole 502. The pinhole 502 can be configured to reflect and / or block the second device light 121 and / or the light emitting material 201 emitted from the first side 211.

[0145] Therefore, in a specific embodiment, the present invention can provide a light generation system 1000, which includes a first light generation device 110, a second light generation device 120, a light emitter 210, a first dichroic mirror 521, a second dichroic mirror 602, and a heat conductor 500, wherein: (A) the first light generation device 110 is configured to generate first device light 111 having a first peak wavelength λp1; wherein the first light generation device 110 includes a solid-state light source; wherein the second light generation device 120 is configured to generate second device light 121 having a second peak wavelength λp2; wherein the second light generation device 120 includes a solid-state light source; wherein the solid-state light source is selected from the group consisting of laser diodes and superluminescent diodes; (B) the light emitter 210 includes a light-emitting material 200; wherein the light-emitting material 200 is configured to convert (i) at least a portion of a first device light 111 received by the light-emitting material 200, and (ii) at least a portion of a second device light 121 received by the light-emitting material 200 into light-emitting material light 201; wherein the light-emitting body 210 includes a first side 211, a second side 212, and a third side 213 bridging the first side 211 and the second side 212; (c) a heat conductor 500 includes a heat-conducting material 503 and includes a light-transmitting portion 501; (d) the first side 211 of the light-emitting body 210 is configured to be in a light-receiving relationship with the first light-generating device 110 via the light-transmitting portion 501; the second side 211 of the light-emitting body 210... 12 is configured to be in a light-receiving relationship with the second light-generating device 120; and one or more of a portion of the first side 211, a portion of the second side 212, and at least a portion of the third side 213 are configured to be in thermal contact with the heat conductor 500; © A first dichroic mirror 521 is disposed between the first light-generating device 110 and the light emitter 210, wherein the first dichroic mirror 521 is configured to have (i) a higher transmittance for the first device light 111 than for the light emitting material light 201 and (ii) a higher reflectance for the light emitting material light 201 than for the first device light 111; (f) A second dichroic mirror 602 is disposed relative to the second light-generating device 120. Downstream and upstream of the light emitter 210; wherein the second dichroic mirror 602 is configured to (i) reflect at least a portion of the second device light 121 and transmit at least a portion of the light emitting material light 201, or (ii) transmit at least a portion of the second device light 121 and reflect at least a portion of the light emitting material light 201; and (G) the light generation system 1000 is configured to generate system light 1001 including the light emitting material light 201 in a first operating mode of the light generation system 1000, and wherein in the first operating mode, at least a portion of the light emitting material light 201 generated by the first device light 111 and at least a portion of the light emitting material 201 generated by the second device light 121 are emitted from the second side 212.

[0146] Returning to the configuration of the light-generating system 1000, the light-emitting element 210 may have a first height H1. Furthermore, the heat conductor may include a recess 510. The recess 510 may be configured to receive at least a portion of the light-emitting element 210. Specifically, the light-emitting element 210 may be disposed within the recess 510 on at least a portion of the first height H1. In such an embodiment, at least a portion of the third side surface 213 may be configured to be in thermal contact with the heat conductor 500, particularly via the recess 510. Furthermore, as... Figure 1 As shown, the light emitter 210 can be fully disposed within the recess 510, wherein (substantially) all of the third side surfaces 213 are also configured to be in thermal contact with the heat conductor 500. The heat conductor 500 may include walls that reflect one or more of the first device light 111, the second device light 121, and the light emitting material light 201. In particular, the walls of the heat conductor 500 in thermal contact with the light emitter 210, such as, in particular, the walls of the recess 510, can reflect one or more of the first device light 111, the second device light 121, and the light emitting material light, such as, in particular, all of the first device light 111, the second device light 121, and the light emitting material light 201.

[0147] Additionally, especially Figure 1 In the configuration shown, it is important that no first device light 111 is transmitted through the light emitter 210, because such transmitted light could be incident on the second light generating device 120. Therefore, the first device light 111 and the light emitter 210 can be selected, particularly the concentration of the luminescent material 200 included in the light emitter 210 and the maximum absorption wavelength λ. ex This ensures that (virtually) no first device light 111 can be transmitted through the light emitter 210. Specifically, the first peak wavelength λp1 and the light emitter 210 can be selected such that a maximum of 2% of the first device light 111 at the first peak wavelength λp1 can be transmitted through the first absorption height H of the light emitter 210. 1a In such an embodiment, 0.9 H1≤H 1a ≤H1. However, as Figure 1 As shown, the first height H1 can also be the first absorption height H. 1a Several times larger. This ensures that even if the light emitter 210 is (partially) damaged, no first device light 111 can still pass through the light emitter 210. Therefore, the first peak wavelength λp1 and the light emitter 210 can be selected such that 3 H 1a ≤H1≤6 H 1a .

[0148] In the first operating mode of the light generating system 1000, before irradiating the light emitter 210, the first device light 111 can enter the recess 510 through the pinhole 502. Therefore, in such an embodiment, the light-transmitting portion 501 may include the pinhole 502. Furthermore, in... Figure 1 In the illustrated embodiment, the pinhole 502 and the recess 510 can be configured such that the first device light 111 enters the recess 510 via the pinhole 502. Additionally, a light generating system can be configured in the recess 510 and positioned downstream of the pinhole 502 and upstream of the light emitter 210 relative to the first light generating device 110.

[0149] The light emitter 210, which can be physically separated from a laser source (such as a first light generating device 110 and / or a second light generating device 120), has a first side 211, a second side 212, and a third side 213. At least one of these sides can contact a heat sink (e.g., a heat conductor 500) to cool, for example, the side holding the heat sink. At least a portion of the second side 212 and at least a portion of the first side 211 may not be covered by the heat sink, such that a first device light 111 (blue) with a first peak wavelength λp1 can pump the light emitter 210 (e.g., a phosphor tile) from its first side 211, and a second device light 121 (blue) with a second peak wavelength λp1 can pump the light emitter 210 from its second side 212. The light emitter 210 can at least partially convert the first (laser) device light 111 and the second (laser) device light 121 into luminescent material light 201, wherein the luminescent material light 201 may be greenish-yellow (and red) light. To capture the luminescent material light 201 from only one side, the first side 211 of the phosphor tile (or luminescent body 210) may be covered by a first dichroic mirror 521, which may be (at least partially, but particularly substantially) transparent to the first device light 111, but reflective to the luminescent material light 201 (“converted light”). Alternatively or additionally, the first side 211 of the phosphor tile (or luminescent body 210) may be covered with a reflective pinhole 502, which may also have a heat dissipation function. To extract the luminescent material light 201, a color separation element may be provided between the second light generating device 120 providing the second device light 121 and the luminescent body 210. The color separation element, such as a second dichroic mirror 602, may be configured to prevent at least a portion, but particularly (substantially) all, of the luminescent material light 201 from incident on the second light generating device 120 providing the second device light 121. Optionally, one or more (first) optical elements 610, such as one or more lenses, may be used to focus the second (laser) device light 121 onto the second side 212 of the light emitter 210, and to capture and collimate the light 201 of the light-emitting material. Similarly, suitable (first) optical elements 610, such as one or more lenses, may also be used to focus the first (laser) device light 111 onto the first side 211 of the light emitter 210.

[0150] In an embodiment, the light emitter 210 may not convert all incident first device light 111 and / or second device light 121 into luminescent material light 201. In this case, the first device light 111 may be partially transmitted through the light emitter 210, i.e., the light emitter 210 may be configured to be in a transmission mode with respect to the first device light 111. The second device light 121 may be reflected at a first side 211 by a first dichroic mirror 521 and / or a pinhole 502, and may subsequently exit the light emitter 210 via the same side (i.e., second side 212) as the second device light 121 entered the light emitter 210, i.e., the light emitter 210 may be configured to be in a reflection mode with respect to the second device light 121. In this document, the term "reflection mode" may further indicate that when the (second) device light is reflected at the light emitter, it may have a direction that overlaps with the direction in which the luminescent material light escapes from the system. In this document, the term "transmission mode" can also refer to a direction that overlaps with the direction in which the light emanating from the system travels when the (first) device light propagates in the light emitter in the same direction as it propagates directly upstream of the light emitter. Therefore, the light-transmitting portion 501 may include a pinhole 502. Additionally, in the first operating mode, at least a portion of the first device light 111 and at least a portion of the second device light 121 can be emitted from the second side 212. Furthermore, the light emitter 210 can be configured such that more blue laser light (i.e., the first device light 111 and the second device light 121) can be transmitted through the light emitter 210 in the transmission mode compared to the case collected in the reflection mode. This is because the path length in the reflection mode can be twice the path length in the transmission mode. Alternatively or additionally, λp1 ≠ λp2, especially λp1 may be closer to the maximum absorption wavelength λ of the light-emitting material than λp2. ex In this configuration, the first dichroic mirror 521 may be reflective to the second device light 121, but transparent to the first device light 111. The control system 300 may be used to control the first device light 111 and the second device light 121 separately. These configurations allow for CCT control.

[0151] Therefore, the light generating system 1000 may include a control system 300. The control system 300 may be configured to individually control the first device light 111 generated by the first light generating device 110 and the second device light 121 generated by the second light generating device 120. Furthermore, in a specific embodiment, the control system 300 may be configured to control one or more of the color point, correlated color temperature, and color rendering index (CRI) of the system light 1001.

[0152] Figure 2a schematically depicts a first dichroic mirror 521 during a (first) operating mode of the light generation system 1000. As shown, during operation, the first dichroic mirror 521 can be configured to transmit at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the first device light 111. Additionally, during operation, the first dichroic mirror 521 can be configured to reflect at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the luminescent material light 201 (and in a particular embodiment, including second luminescent material light 201').

[0153] Figure 2b schematically depicts a cross-section of a heat conductor 500 including a thermally conductive material 503, a light-transmitting portion 501, and a pinhole 502. The heat conductor 500 may also include a reflective wall (see above). Furthermore, the heat conductor 500 may include a recess 510. In embodiments, the recess 510 may be a through-hole. In specific embodiments, this may be a cylindrical through-hole, a cubic through-hole, or a rectangular cube. In such embodiments, the through-hole may have two openings, with a first opening at a second side 212 of the light-emitting element 210 and a second opening at a first side 211 of the light-emitting element 210, and the openings may have substantially the same size.

[0154] Figure 2c schematically depicts a structure including luminescent material 200, a first side surface 211, a second side surface 212, a third side surface 213, a first height H1, and a first absorption height H. 1a The cross-section of the light-emitting element 210. In this document, one embodiment is described, where H1 = 1.5. H 1a However, this is not mandatory. In embodiments, the luminescent material 200 may include at least type A3B5O. 12 The luminescent material is Ce. Specifically, A includes one or more of Y, La, Gd, Tb, and Lu, and B includes one or more of Al, Ga, In, and Sc. In such an embodiment, the device light (111, 121) may include blue device light (111, 121). In the embodiment shown here, the luminescent body 210 is configured to be in a transmission mode for the first device light 111 and a reflection mode for the second device light 121. Furthermore, both the first device light 111 and the second device light 121 are completely absorbed by the luminescent material 200 and converted into luminescent material light 201.

[0155] Figure 3The spectral power distributions of the first device light 111 and the second device light 121 are schematically depicted. As shown on the left, the first device light 111 and the second device light 121 can have (substantially) the same spectral power distribution. In particular, the first peak wavelength λp1 and the second peak wavelength λp2 can be (substantially) the same. Furthermore, in the embodiment, the luminescent material 200 can have a maximum absorption wavelength λ. ex The absorption spectrum (dashed line). In the embodiment, the first peak wavelength λp1 can be the same as λ. ex Phase difference Δλ m-1 The distance (in nm). Furthermore, in the embodiment, the second peak wavelength λp2 can be related to λ. ex Phase difference Δλ m-2 The distance (in nm) between the first device light 111 and the second device light 121 can be different spectral power distributions, as shown on the right. Specifically, the first peak wavelength λp1 and the second peak wavelength λp2 can differ by at least 5 nm, for example, at least 10 nm, and particularly at least 20 nm. Furthermore, the luminescent material 200 can have a higher absorption intensity for one of the first device light 111 and the second device light 121 than for the other. Specifically, the luminescent material 200 can have a higher absorption intensity at the first peak wavelength λp1 than at the second peak wavelength λp2, i.e., Δλ m-1 It can be less than Δλ m-2 On the right Figure 3 In, Δλ m-1 It is (essentially) 0, and the first peak wavelength λp1 is equal to λ. ex .

[0156] Figure 4a schematically depicts an embodiment of a light generation system 1000 including multiple light generation devices 100, each including a first light generation device 110 and a second light generation device 120. In this document, the multiple light generation devices 100 are configured to generate device light 101. Furthermore, the system can be configured such that a portion of the device light 101 bypasses a light emitter 210 (not shown) to provide a third light 103. Specifically, a portion of the device light 101 can bypass the light emitter 210 by using one or more first optical elements 610 (see below). Therefore, the light generation system 1000 can be configured to generate system light 1001 comprising luminescent material light 201 and the third light 103 in a first operating mode of the light generation system 1000.

[0157] Figure 4b shows an embodiment similar to Figure 4a, but with a different first optical element 610. In this document, as shown in Figure 4a, the rightmost light generating device can be a first light generating device 110, a second light generating device 120, or a third light generating device 130 (see below).

[0158] Figure 5a schematically depicts another embodiment of the light generation system 1000, which includes a third light generation device 130. The third light generation device 130 may be the same as the first light generation device 110 and / or the second light generation device 120. However, the third light generation device 130 may also be different from the first light generation device 110 and / or the second light generation device 120. In this document, the third light generation device 130 is configured to generate a third device light 131. However, the third light generation device 130 may also be configured to generate a third light 103, or the third light 103 may consist (substantially) of the third device light 131. Furthermore, the light generation system 1000 shown herein includes a third dichroic mirror 603, which is configured to (i) reflect at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the third device light 131 (or the third light 103), and (ii) transmit at least 70%, for example at least 80%, particularly at least 90%, including (substantially) all of the luminescent material light 201. Therefore, in this embodiment, the system light 1001 may include the third light 103 (or the third device light 131) and the light-emitting material light 201.

[0159] Furthermore, the first light-generating device 110 can be configured perpendicular to the first surface 211. In such an embodiment, the first optical axis O1 can have an angle β1 between the (first) portion of the first optical axis O1 extending from the first light-generating device 110 and the (second) portion of the first optical axis O1 intersecting the light-emitting body 210. In an embodiment, the angle β1 can be selected from the range of 60°-90°. Furthermore, in Figure 1 In the illustrated embodiment, the angle β1 can be selected from the range of 0-15°. Similarly, the second light generating device 120 can be configured perpendicular to the second surface 212. In such an embodiment, the second optical axis O2 can have an angle β2 between the (first) portion of the second optical axis O2 extending from the second light generating device 120 and the (second) portion of the second optical axis O2 intersecting with the light emitter 210. In this embodiment, the angle β2 can be selected from the range of 60-90°. Furthermore, in Figure 1 In the illustrated embodiment, angle β2 can be selected from the range of 0-15°.

[0160] Furthermore, Figure 5a illustrates an embodiment of an illumination device 1200 (see below) including a light generating system 1000. In this document, the light generating system 1000 can be particularly secure in the event of breakage or loss of the first optical element 610 (not shown), the light emitter 210, or the dichroic mirrors 602, 603. For example, the light outlet 2000 of the light generating system 1000 can be configured outside the first optical axis O1 and the second optical axis O2, such that the first device light 111 and the second device light 121 can not be directly transmitted to the light outlet 2000. Furthermore, for example, in the event of damage to the light emitter 210, the third dichroic mirror 603 can be configured to reflect the first device light 111 and the second device light 121 away from the light outlet 2000. Finally, for example, the optical element guiding the first device light 111 (or the second device light 121) to the light emitter 210 can be reflective of the first device light 111 (or the second device light 121) and transmissive of the second device light 121 (or the first device light 111). In this way, when the light source breaks, the first device light 111 (or the second device light 121) can be prevented from hitting the second light generating device 120 (or the first light generating device 110).

[0161] Figure 5b schematically depicts another embodiment of the light generation system 1000, which also includes one or more first optical elements 610. In this document, one or more of the following may apply: (a) one or more first optical elements 610 may be configured to split a first device light 111 into at least two parts, wherein a first part will propagate to a light emitter 210 and a second part will bypass the light emitter 210 to provide at least a portion of a third light 103; (b) one or more first optical elements 610 may be configured to split a second device light 121 into at least two parts, wherein a first part will propagate to a light emitter 210 and a second part will bypass the light emitter 210 to provide at least a portion of the third light 103; and (c) the plurality of light generation devices 100 further include a third light generation device 130, wherein the third light generation device 130 may be configured to generate a third device light 131, and wherein one or more first optical elements 610 may be configured to guide at least a portion of the third device light 131 around the light emitter 210 to provide at least a portion of the third light 103. Furthermore, one or more first optical elements 610 may include one or more of the following: a dichroic beam splitter, a polarizing beam splitter, a semi-transparent mirror, a mirror, and one or more lenses. Specifically, options (b) and (c) are depicted in FIG. 5b. Herein, the second device light 121 (generated by the intermediate light generating device) is split into two parts by the first optical element 610 including the semi-transparent mirror to provide at least a portion of the third light 103, which propagates to the light emitter 210. Furthermore, the device light 111, 121, or the third device light 131 generated by the rightmost light generating device completely bypasses the light emitter 210 to provide at least a portion of the third light 103. Hereinin, the aforementioned lights 111, 121, 131 can pass through a diffuser system to generate diffused light, for example, especially diffused blue light. The diffuser system may include a polarization changing element 810, one or more converging lenses 620, and a diffuser element 710.

[0162] In an embodiment, the polarization changing element 810 may be configured in the optical path of the device lights 101, 111, 121, 131 between the corresponding light generating devices(s) 100, 110, 120, 130 and the diffuser element 710. In an embodiment, the polarization changing element 810 may in particular include one or more of a λ / 4 waveplate and a Faraday rotator. Furthermore, in an embodiment, the diffuser element 710 may be configured to diffuse (by reflection) at least a portion of the device lights 101, 111, 121, 131 received by the diffuser element 710, thereby providing diffused device lights 101, 111, 121, 131 (or at least a portion of the third light 103) while maintaining at least a portion of the polarization of the device lights 101, 111, 121, 131. Therefore, in an embodiment, the diffuser element 710 may operate in a reflection mode. In particular, the diffuser element 710 may be a polarization-maintaining reflective diffuser element 710.

[0163] Furthermore, starting with linear p-polarized light, it is converted by polarization changing element 810 into, for example, right-hand circularly polarized light, which is then converted by polarization-maintaining reflective diffuser element 710 into left-hand circularly polarized light, which is now converted by polarization changing element 810 into linear s-polarized light. Similarly, s-polarized light can be converted into diffuse p-polarized light. Therefore, device lights 101, 111, 121, 131 can pass through polarization changing element 810 twice: once from light generating devices 100, 110, 120, 130 to diffuser element 710 with a first polarization, and once from diffuser element 710 to light outlet 2000 of light generating system 1000, where they are diffused and acquire a second polarization when passing through polarization changing element 810 (in the direction of light outlet 2000).

[0164] The following is an example of the operating modes of a diffuser system:

[0165] The transmitted blue (p-polarized) device light 101, 111, 121, 131 can pass through polarization changing element 810 (e.g., λ / 4 plate) and can be projected onto preferred polarization-maintaining diffuser 710 via converging lens 620 to produce diffused blue device light 101, 111, 121, 131. The diffused blue device light 101, 111, 121, 131 can be collected by converging lens 620 and can pass again through polarization changing element 810 (through polarization changing element 810, the diffused blue device light 101, 111, 121, 131 essentially becomes s-polarized light).

[0166] The diffuser system can be combined in particular with a polarization beamsplitter 610 (included by one or more first optical elements 610). Herein, the polarization beamsplitter 610 can be configured to transmit light with a first polarization (corresponding to the polarization of device lights 101, 111, 121, 131) and reflect light with orthogonal polarization (corresponding to the polarization of diffused device lights 101, 111, 121, 131 or third light 103). Therefore, the light generation system 1000 can be configured such that in the event of a malfunction of the diffuser system, no directional (or “non-diffuse”) light can mix with the system light 1001. Furthermore, diffused blue device lights 101, 111, 121, 131 (or at least a portion of the third light 103) can be combined with luminescent material light 201 to generate (white) system light 1001. Therefore, the system light 1001 can include diffused blue light.

[0167] Figure 5c schematically depicts an embodiment of a light generating system 1000 including a rotatable element 1400. The rotatable element 1400 may be a phosphor wheel or a phosphor pillar. Furthermore, the rotatable element 1400 (shown in cross-section) may have a circular shape. Additionally, in the depicted embodiment, the light emitter 210 may be annular and may be disposed on the surface of the rotatable element 1400. Specifically, the light emitter 210 may be in (thermal) contact with the rotatable element 1400 via a first side surface 211. In an embodiment, the rotatable element 1400 may include a thermally conductive material. In a specific embodiment, the rotatable element 1400 may include a thermally conductive body (not shown in detail, but see, for example...). Figure 1 (See Figures 2b, 5a, 5b, and 5d). Furthermore, in this embodiment, the rotatable element 1400 may include a light emitter 210. During operation of the light generating system 1000, the rotatable element 1400 can be configured to rotate about a rotation axis A. R Rotation. This rotation provides the advantage that different portions of the light-emitting element 210 can be illuminated by device light 101, 111, 121 over time. This facilitates thermal management. Furthermore, as shown, the rotatable element 1400 may include a light-transmitting portion 501, also indicated elsewhere by reference numeral 910. Specifically, the light-transmitting portion 501 may be configured to contact a first side surface 211 (thermally) of the light-emitting element 210.

[0168] Figure 5d schematically depicts another embodiment of the light generating system 1000. Herein, the light-transmitting portion 501 includes a light-transmitting window 910 disposed downstream of the first light generating device 110 and upstream of the light emitter 210. In this embodiment, the light-transmitting window 910 may comprise light-transmitting ceramic or sapphire. Furthermore, in this embodiment, the (first) side 211 of the light emitter 210 may be in thermal contact with the light-transmitting window 910. The light-transmitting window 910 may transmit the first device light 111, the second device light 121, and the light-emitting material light 201. The light-transmitting window 910 may also provide thermal contact with the heat conductor 500. Herein, the light-transmitting window 910 may be in thermal contact (via the first side 211) with the light emitter 210 and (via the recess 510) with the heat conductor 500.

[0169] Figure 5e schematically depicts an embodiment of a heat conductor 500 including a light-transmitting window 910. In this document, the light generating system 1000 (such as the recess 510 of the heat conductor 500) also includes a second light-transmitting portion 920, such as the second light-transmitting window, disposed on a second side surface 212 of the light emitter 210. Therefore, the second light-transmitting portion 920 is disposed downstream of the light emitter 210 relative to the first light generating device 110. Optionally, a first dichroic mirror 521 (indicated by dashed lines) may be disposed between the light emitter 210 and the light-transmitting window 910. Specifically, the first dichroic mirror 521 may be disposed downstream of the light-transmitting window 910 and upstream of the light emitter 210 and the second light-transmitting portion 920 relative to the first light generating device 110. In an embodiment, the second light-transmitting portion 920 may include the second light-transmitting window, wherein the second light-transmitting window may include light-transmitting ceramic or sapphire.

[0170] Figure 6 Several embodiments of a lighting device 1200, including a light-generating system as defined herein, are schematically depicted. Therefore, Figure 6 An embodiment of a luminaire 2 including a lighting device 1200 (and a light generating system 1000) is schematically depicted. Reference numeral 301 indicates a user interface that can be functionally coupled to a control system 300, which is included in or functionally coupled to the light generating system 1000. Figure 6 An embodiment of a lamp 1 including a light generating system 1000 is also schematically depicted. Reference numeral 3 indicates a projector device or projector system, which can be used, for example, to project images onto a wall, and may also include the light generating system 1000. Therefore, Figure 6An embodiment of a lighting device 1200 selected from the group consisting of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device is schematically depicted. This lighting device 1200 includes a light generating system 1000 as described herein. In embodiments, such a lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Lighting device light emanating from the lighting device 1200 is indicated by reference numeral 1201. Lighting device light 1201 may consist substantially of system light 1001, and therefore may be system light 1001 in specific embodiments. Reference numeral 1300 indicates a space, such as a room. Reference numeral 1305 indicates a floor, reference numeral 1310 indicates a ceiling, and reference numeral 1307 indicates a wall.

[0171] The term "multiple" refers to two or more items. The terms "substantially" or "truly" and similar terms used herein will be understood by those skilled in the art. The term "substantially" or "truly" may also include embodiments having connotations such as "completely," "entirely," "all," etc. Therefore, in embodiments, the adjective "substantially" or "truly" may also be removed. Where applicable, the term "substantially" or "truly" may also refer to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term "comprising" also includes embodiments in which the term "comprising" means "consisting of." The term "and / or" particularly refers to one or more 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 items 1 and 2. The term "comprising" in one embodiment may mean "consisting of," but in another embodiment it may also mean "containing at least the defined kind and optionally one or more other kinds." The use of the verb "comprising" and its variations does not exclude the presence of elements or steps other than those stated in the claims. Unless the context clearly requires otherwise, throughout the specification and claims, the words "comprising," "including," etc., should be interpreted in an inclusive sense, rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to." The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Furthermore, the terms first, second, third, etc., in the specification and claims are used to distinguish similar elements and are not necessarily used to describe an order or chronological order. It should be understood that such terms are interchangeable where appropriate, and embodiments of the invention described herein can operate in orders other than those described or shown herein.

[0172] The equipment, apparatus, or system described herein may be used during operation. Those skilled in the art will understand that the invention is not limited to the method of operation, or the equipment, apparatus, or system in operation.

[0173] It should be noted that the above embodiments are illustrative and not limiting of the invention, and those skilled in the art will be able to devise many alternative embodiments without departing from the scope of the appended claims.

[0174] In the claims, any reference numerals placed between parentheses should not be construed as limiting the claims.

[0175] This invention can be implemented by hardware comprising several different elements and by a computer that is appropriately programmed. In the device, apparatus, or system claims that enumerate several methods, several of these methods can be implemented by the same hardware. The fact that certain measures are recited in mutually different dependent claims does not imply that combinations of these measures cannot be advantageously used. In another aspect, the invention can (therefore) provide a software product that, when run on a computer, enables the implementation of (one or more embodiments) of the methods described herein.

[0176] The present invention may also provide a control system that can control a device, apparatus, or system, or perform the methods or processes described herein. Furthermore, the present invention may also provide a computer program product that, when functionally coupled to or operated on a computer included in a device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.

[0177] The present invention is also applicable to devices, apparatuses, or systems that include one or more features described in the specification and / or shown in the drawings. The present invention also relates to methods or processes that include one or more features described in the specification and / or shown in the drawings.

[0178] The various aspects discussed in this patent can be combined to provide additional advantages. Furthermore, those skilled in the art will understand that embodiments can be combined, and more than two embodiments can be combined. Additionally, some features can form the basis of one or more divisional applications.

Claims

1. A light generating system (1000), comprising a first light generating device (110), a second light generating device (120), a light emitter (210), a first dichroic mirror (521), a second dichroic mirror (602), and a heat conductor (500), wherein: - The first light generating device (110) is configured to generate first device light (111) having a first peak wavelength (λp1); wherein the first light generating device (110) includes a solid-state light source; wherein the second light generating device (120) is configured to generate second device light (121) having a second peak wavelength (λp2); wherein the second light generating device (120) includes a solid-state light source; wherein the solid-state light source is selected from the group consisting of laser diodes and superluminescent diodes; wherein the first peak wavelength (λp1) and the second peak wavelength (λp2) are selected from the range of 430 nm to 490 nm; - The light emitter (210) includes a light-emitting material (200); wherein the light-emitting material (200) is configured to convert (i) at least a portion of the first device light (111) received by the light-emitting material (200) and (ii) at least a portion of the second device light (121) received by the light-emitting material (200) into light-emitting material light (201); wherein the light emitter (210) includes a first side (211), a second side (212) and a third side (213) bridging the first side (211) and the second side (212). - The heat conductor (500) includes a heat-conducting material (503) and a light-transmitting portion (501); - The first side (211) of the light emitter (210) is configured to receive light from the first light generating device (110) via the light-transmitting portion (501); the second side (212) of the light emitter (210) is configured to receive light from the second light generating device (120); and one or more of a portion of the first side (211), a portion of the second side (212), and at least a portion of the third side (213) are configured to be in thermal contact with the heat conductor (500); - The first dichroic mirror (521) is disposed between the first light generating device (110) and the light emitter (210), wherein the first dichroic mirror (521) is configured to have: (i) a higher transmittance for light from the first device (111) than for light from the light emitting material (201); and (ii) a higher reflectance for light from the light emitting material (201) than for light from the first device (111); - The second dichroic mirror (602) is disposed downstream of the second light generating device (120) and upstream of the light emitter (210) relative to the second light generating device (120); wherein the second dichroic mirror (602) is configured to (i) reflect at least a portion of the light from the second device (121) and transmit at least a portion of the light from the light emitting material (201), or (ii) transmit at least a portion of the light from the second device (121) and reflect at least a portion of the light from the light emitting material (201); as well as - The light generating system (1000) is configured to generate system light (1001) including luminescent material light (201) in a first operating mode of the light generating system (1000), and wherein in the first operating mode, at least a portion of the luminescent material light (201) generated by the first device light (111) and at least a portion of the luminescent material light (201) generated by the second device light (121) are emitted from the second side (212).

2. The light generating system (1000) according to claim 1, wherein the light-transmitting portion (501) comprises one or more of the following: (a) a pinhole (502), wherein a portion of the first side surface (211) is configured to be in thermal contact with the heat conductor (500), and (b) a light-transmitting window (910), wherein the light-transmitting window (910) is configured downstream of the first light generating device (110) and upstream of the light emitter (210); wherein the light-transmitting window (910) comprises light-transmitting ceramic or sapphire.

3. The light generating system (1000) according to any one of the preceding claims, wherein the light emitter (210) has a first height (H1); wherein the heat conductor (500) includes a recess (510) configured to receive at least a portion of the light emitter (210), such that the light emitter (210) is disposed in the recess (510) at least a portion of the first height (H1); wherein at least a portion of the third side surface (213) is configured to be in thermal contact with the heat conductor (500).

4. The light generating system (1000) according to claims 2 to 3, wherein the pinhole (502) and the recess (510) are configured such that a first device light (111) enters the recess (510) via the pinhole (502); wherein a first dichroic mirror (521) is disposed in the recess (510) and is disposed downstream of the pinhole (502) and upstream of the light emitter (210) relative to the first light generating device (110).

5. The light generating system (1000) according to any one of the preceding claims, wherein one of the following applies: (a) the first peak wavelength (λp1) and the second peak wavelength (λp2) differ by at least 10 nm, and wherein the light-emitting material (200) has a higher absorption intensity at the first peak wavelength (λp1) than at the second peak wavelength (λp2), and (b) the first peak wavelength (λp1) and the second peak wavelength (λp2) differ by a maximum of 5 nm.

6. A light generating system (1000) according to any one of the preceding claims, wherein the light emitter (210) has a first height (H1) as defined in claim 3; wherein the first peak wavelength (λp1) and the light emitter (210) are selected such that a maximum of 2% of the first device light (111) at the first peak wavelength (λp1) is transmitted through the first absorption height (H1) of the light emitter (210). 1a ), of which 0.9 H1≤H 1a ≤H1.

7. The light generating system (1000) according to claim 6, wherein the first peak wavelength (λp1) and the light emitter (210) are selected such that 3 H 1a ≤H1≤6 H 1a .

8. The light generating system (1000) according to any one of the preceding claims, comprising a plurality of light generating devices (100), the plurality of light generating devices (100) including a first light generating device (110) and a second light generating device (120), wherein the plurality of light generating devices (100) are configured to generate device light (101); wherein the system is configured such that a portion of the device light (101) bypasses the light emitter (210) to provide a third light (103); wherein the light generating system (1000) is configured to generate system light (1001) comprising light emitting material light (201) and third light (103) in an operating mode of the light generating system (1000).

9. The light generation system (1000) according to any one of the preceding claims includes one or more laser groups (1100), wherein each of the one or more laser groups includes one or more of the following: (i) a plurality of first light generation devices (110) and (ii) a plurality of second light generation devices (120).

10. The light generating system (1000) according to claims 8 to 9, further comprising one or more first optical elements (610), wherein one or more of the following are applicable: - The one or more first optical elements (610) are configured to split the first device light (111) into at least two parts, wherein the first part propagates to the light emitter (210) and the second part bypasses the light emitter (210) to provide at least a portion of the third light (103); - The one or more first optical elements (610) are configured to split the second device light (121) into at least two parts, wherein a first part propagates to the light emitter (210), and a second part bypasses the light emitter (210) to provide at least a portion of the third light (103); and - The plurality of light generating devices (100) further include a third light generating device (130), wherein the third light generating device (130) is configured to generate a third device light (131), and wherein the one or more first optical elements (610) are configured to guide at least a portion of the third device light (131) around the light emitter (210) to provide at least a portion of the third light (103); wherein the one or more first optical elements (610) include one or more of the following: a dichroic beam splitter, a polarizing beam splitter, a translucent mirror, a mirror, and one or more lenses.

11. The light generating system (1000) according to any one of claims 8 to 10, wherein the system light (1001) comprises diffuse blue light.

12. The light generating system (1000) according to any one of the preceding claims, wherein the light-emitting material (200) comprises at least The light-emitting material of the type, 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; wherein the device light (111, 121) includes blue device light (111, 121); and wherein the light generating system (1000) further includes a rotatable element (1400), wherein the rotatable element (1400) includes the light emitter (210); wherein during operation of the light generating system (1000) in the first operating mode, the rotatable element (1400) rotates such that different portions of the light emitter (210) are irradiated by the device light (101) over time.

13. The light generating system (1000) according to any one of claims 10 to 13 further includes a control system (300), wherein the control system (300) is configured to individually control the first device light (111) generated by the first light generating device (110) and the second device light (121) generated by the second light generating device (120).

14. The light generating system (1000) of claim 13, wherein the control system (300) is configured to control one or more of the color point, correlated color temperature and color rendering index of the system light (1001).

15. A lighting device (1200), selected from the group consisting of a lamp (1), a luminaire (2), a projector device (3), a disinfection device, a photochemical reactor, an automotive lighting device, and an optical wireless communication device, said lighting device including a light generating system (1000) according to any one of the preceding claims.

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