WO2021028426A1 - Rapport réglable de lumière converti en lumière transmise dans un convertisseur luminescent transparent - Google Patents

Rapport réglable de lumière converti en lumière transmise dans un convertisseur luminescent transparent Download PDF

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Publication number
WO2021028426A1
WO2021028426A1 PCT/EP2020/072474 EP2020072474W WO2021028426A1 WO 2021028426 A1 WO2021028426 A1 WO 2021028426A1 EP 2020072474 W EP2020072474 W EP 2020072474W WO 2021028426 A1 WO2021028426 A1 WO 2021028426A1
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WIPO (PCT)
Prior art keywords
light
light source
lighting device
converter element
transmissive
Prior art date
Application number
PCT/EP2020/072474
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English (en)
Inventor
Ties Van Bommel
Rifat Ata Mustafa Hikmet
Original Assignee
Signify Holding B.V.
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Filing date
Publication date
Application filed by Signify Holding B.V. filed Critical Signify Holding B.V.
Publication of WO2021028426A1 publication Critical patent/WO2021028426A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0087—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • H01S5/4087—Array arrangements, e.g. constituted by discrete laser diodes or laser bar emitting more than one wavelength

Definitions

  • the invention relates to a lighting device.
  • the invention further relates to a lighting system comprising one or more of such lighting devices.
  • the invention also relates to a projection system comprising such lighting device or such lighting system, or to a luminaire comprising such lighting device or such lighting system.
  • Lighting devices comprising a laser and a converter are known in the art.
  • US2019/0097092 describes a linear lighting device including a laser light source that emits laser light, a wavelength converter that converts a wavelength of the laser light and emits wavelength-converted light, and a linear light guide that is elongated and guides the wavelength-converted light emitted by the wavelength converter and introduced through a longitudinal end surface.
  • the linear light guide includes a lateral surface which emits, from the linear light guide, the wavelength-converted light guided by the linear light guide. The proportion of the wavelength-converted light emitted by the lateral surface gradually increases with an increase in optical path length in the linear light guide.
  • WO2017/157705A1 discloses a light emitting device comprising a luminescent element that has a light input surface and a light exit surface.
  • the luminescent element receives light from a laser light source at the light input surface and couples converted light out of the light exit surface.
  • a heat sink element is arranged to be in thermal contact with at least a part of the luminescent element.
  • the input surface comprises a cross- sectional area A with a characteristic dimension B.
  • the luminescent element has a length L. The length L and the dimension B are chosen such that they satisfy a specific relation.
  • a high intensity light source with a tunable spectral distribution such as a tunable color point.
  • Phosphor conversion of laser light may be preferred because of eye safety considerations.
  • the amount of absorbed laser light and thus the amount of converted light is determined by the thickness of the phosphor layer.
  • presently know solutions do not provide such high intensity light source with a tunable spectral distribution or may have other disadvantages.
  • the present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
  • the angle at which laser coupled into the transparent light converting material determines the path length of the laser light thus also the degree of its conversion. For example, if the laser beam enters the convertor at an angle of 90° with respect to the surface it has the shortest path thus the lowest conversion. When the angle is reduced then the laser beam bounces within the converter following a longer path thus larger percentage of the laser light is converted.
  • the invention provides a lighting device (“device”) configured to generate lighting device light, wherein the lighting device especially has a controllable spectral power distribution.
  • the lighting device may comprise (i) a first light source and (ii) a light transmissive light converter element (“converter element” or “light converter element”).
  • the first light source may comprise a laser light source, wherein the first light source is configured to generate first light source light having an optical axis (O), a beam shape, and a first spectral power distribution.
  • the light transmissive light converter element may comprise a radiation input face (or “radiation entrance window”), configured in a light receiving relationship with the first light source, and a radiation exit face.
  • the optical axis (O) has a first angle (g) relative to the radiation input face.
  • the light transmissive converter element is transmissive for at least part of the light source light propagating from the radiation input face to the radiation exit face.
  • the light transmissive converter element is further configured to convert part of the light source light propagating through the light transmissive converter element into converter element light (“converter light” or “luminescent material light”) having a converter element light spectral power distribution differing from the first spectral power distribution of the first light source light.
  • the lighting device light comprises one or more of first light source light and converter element light (both) emanating from the radiation exit face.
  • the invention provides a lighting device configured to generate lighting device light having a controllable spectral power distribution, wherein the lighting device comprises (i) a first light source, wherein the first light source comprises a laser light source, wherein the first light source is configured to generate first light source light having an optical axis (O), a beam shape, and a first spectral power distribution, and (ii) a light transmissive light converter element comprising a radiation input face, configured in a light receiving relationship with the first light source, and a radiation exit face, wherein the optical axis (O) has a first angle (g) relative to the radiation input face, wherein the light transmissive converter element is transmissive for at least part of the light source light propagating from the radiation input face to the radiation exit face, wherein the light transmissive converter element is further configured to convert part of the
  • the lighting device comprises (i) a first light source and (ii) a light transmissive light converter element.
  • the first light source comprises a laser light source.
  • the term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc...
  • the term “light source” may also refer to an organic light-emitting diode, such as a passive-matrix (PMOLED) or an active-matrix (AMOLED).
  • the light source comprises a solid-state light source (such as a LED or laser diode).
  • the light source comprises a LED (light emitting diode).
  • the term LED may also refer to a plurality of LEDs.
  • the term “light source” may in embodiments also refer to a so-called chips-on-board (COB) light source.
  • COB especially refers to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of semiconductor light sources may be configured on the same substrate.
  • a COB is a multi LED chip configured together as a single lighting module.
  • the term “light source” may also relate to a plurality of (essentially identical (or different)) light sources, such as 2-2000 solid state light sources.
  • the light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, such as a LED, or downstream of a plurality of solid-state light sources (i.e. e.g. shared by multiple LEDs).
  • the light source may comprise a LED with on- chip optics.
  • the light source comprises a pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering).
  • laser light source especially refers to a laser.
  • Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the range of 200-2000 nm, such as 300-1500 nm.
  • the term “laser” especially refers to a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Especially, in embodiments the term “laser” may refer to a solid-state laser.
  • the terms “laser” or “solid state laser” may refer to one or more of cerium doped lithium strontium (or calcium) aluminum fluoride (Ce:LiSAF, Ce:LiCAF), chromium doped chrysoberyl (alexandrite) laser, chromium ZnSe (CnZnSe) laser, divalent samarium doped calcium fluoride (Sm:CaF2) laser, Er:YAG laser, erbium doped and erbium-ytterbium codoped glass lasers, F-Center laser, holmium YAG (Ho:YAG) laser, Nd:YAG laser, NdCrYAG laser, neodymium doped yttrium calcium oxoborate Nd:YCa 4 0(B0 3 ) 3 or Nd:YCOB, neodymium doped yttrium orthovanadate (NdiYVCL) laser,
  • the terms “laser” or “solid state laser” may refer to one or more of a semiconductor laser diode, such as GaN, InGaN, AlGalnP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc.
  • the term “laser light source” may also refer to a plurality of (different or identical) laser light sources.
  • laser light sources may be arranged in a laser bank.
  • the laser bank may in embodiments comprise heat sinking and/or optics e.g. a lens to collimate the laser light.
  • one or more of the first angle (g) and the beam shape of the first light source light relative to the radiation input face are controllable may be obtained by applying a plurality of (identical) (laser) light sources, especially a plurality of laser light sources, wherein the (laser) light source light from the plurality of light sources can be provided e.g. under different angles g.
  • the (laser) light source light from the plurality of light sources can be provided e.g. under different angles g.
  • two or more (laser) light sources may provide light source light that have different path lengths in the light transmissive converter element.
  • the spectral power distribution of the lighting device light may be controlled, even when all (laser) light sources would provide the same optical power.
  • the laser light source is configured to generate laser light source light (or “laser light”).
  • the first light source light may essentially consist of the laser light source light.
  • the first light source light may also comprise laser light source light of two or more (different or identical) laser light sources.
  • the laser light source light of two or more (different or identical) laser light sources may be coupled into a light guide, to provide a single beam of light comprising the laser light source light of the two or more (different or identical) laser light sources. In this way, an adjustable ratio of converted to transmitted light in transparent luminescent converter may also be provided.
  • the light source light is thus especially collimated light source light.
  • the light source light is especially (collimated) laser light source light.
  • the phrases “different light sources” or “a plurality of different light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from at least two different bins.
  • the phrases “identical light sources” or “a plurality of same light sources”, and similar phrases may in embodiments refer to a plurality of solid-state light sources selected from the same bin.
  • the first light source is especially configured to generate first light source light having an optical axis (O), a beam shape, and a first spectral power distribution.
  • the first light source light may in embodiments comprise one or more bands, having band widths as known for lasers.
  • the band(s) may be relatively sharp line(s), such as having full width half maximum (FWHM) in the range of less than 20 nm at RT (room temperature), such as equal to or less than 10 nm.
  • FWHM full width half maximum
  • the light source light has a first spectral power distribution (intensity on an energy scale as function of the wavelength) which may comprise one or more (narrow) bands.
  • the beam of light source light may be relatively highly collimated, such as in embodiments ⁇ 2° (FWHM), more especially ⁇ 1° (FWHM), most especially ⁇ 0.5° (FWHM).
  • ⁇ 2° (FWHM) may be considered (highly) collimated light source light.
  • the first light source light may essentially consist of the laser light source light.
  • the first light source light may essentially consist of laser light source light of one or more essentially identical laser light sources (such as from the same bin).
  • the first light source especially generates a beam of light source light.
  • the beam has a beam shape.
  • the beam shape may be fixed or variable (see below).
  • the light source light or the beam has an optical axis.
  • the optical axis may be defined as an imaginary line that defines the path along which light propagates through the system starting from the light generating element, here especially the first light source.
  • the lighting device further comprises the light transmissive light converter element.
  • the term “light transmissive light converter element” especially refers to a light converter element that is at least partly transmissive for one or more wavelengths in the UV, visible, or infrared, especially for one or more wavelengths selected from the range of 200-2000 nm, such as 300-1500 nm.
  • the light converter element may in embodiments be a layer.
  • the light converter element may be a solid body.
  • the light converter element may comprise one or more of a layer and a solid body.
  • light source light from the light source is at least partly transmitted through the light transmissive converter element, such as the layer and/or the solid body. In this way, in embodiments light source light entering one part of the light converter element may escape from the light converter element at another part thereof.
  • the light converter element may especially have light guiding or wave guiding properties.
  • the light transmissive material is herein also indicated as waveguide material or light guide material.
  • the light converter element is (essentially) transparent.
  • the light converter element comprises a luminescent material.
  • the layer and/or solid body may comprise a luminescent material.
  • the term “luminescent material” especially refers to a material that can convert first radiation, especially one or more of UV radiation and blue radiation, into second radiation.
  • first radiation and second radiation have different spectral power distributions.
  • the terms “luminescent converter” or “converter” may be applied.
  • the second radiation has a spectral power distribution at larger wavelengths than the first radiation, which is the case in the so-called down-conversion.
  • the second radiation has a spectral power distribution with intensity at smaller wavelengths than the first radiation, which is the case in the so-called up- conversion.
  • the “luminescent material” may especially refer to a material that can convert radiation into e.g. visible and/or infrared light.
  • the luminescent material may be able to convert one or more of UV radiation and blue radiation, into visible light.
  • the luminescent material may in specific embodiments also convert radiation into infrared radiation (IR).
  • IR infrared radiation
  • the luminescent material upon excitation with radiation, the luminescent material emits radiation.
  • the luminescent material will be a down converter, i.e.
  • the luminescent material may comprise down-converter luminescent material, i.e. radiation of a larger wavelength is converted into radiation with a smaller wavelength ( ex > em ).
  • the term “luminescence” may refer to phosphorescence.
  • the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “emission” may be applied.
  • the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively.
  • the term “luminescent material” may in embodiments refer to phosphorescence and/or fluorescence.
  • the term “luminescent material” may also refer to a plurality of different luminescent materials.
  • the luminescent material may luminesce upon excitation with radiation, such as selected from one or more wavelengths selected from the range of 200- 2000 nm, such as 300-1500 nm.
  • the term “light transmissive light converter element” may especially also refer to a light converter element that at least partly absorbs one or more wavelengths in the UV, visible, or infrared, especially one or more wavelengths selected from the range of 200-2000 nm, such as 300-1500 nm, and converts such radiation, at least partly, into luminescence, especially at another wavelength.
  • the light transmissive light converter element comprises a radiation input face, configured in a light receiving relationship with the first light source, and a radiation exit face.
  • the radiation input face and the radiation exit face are not the same part of the converter element, though it is not excluded that the same face may be used for providing the radiation input face and the radiation exit face.
  • the radiation exit face and the radiation input face are comprises by different faces of the converter element (see further also below).
  • the converter element is configured downstream of the first light source.
  • the converter element, more especially the radiation input face thereof is radiationally coupled with the first light source.
  • radiationally coupled may especially mean that (i) a light generating element, such as a light source, and (ii) another item or material, are associated with each other so that at least part of the radiation emitted by the light generating element is received by the item or material.
  • the item or material is configured in a light-receiving relationship with the light generating element. At least part of the radiation of the light generating element will be received by the item or material. This may in embodiments be directly, such as the item or material in physical contact with the (light emitting surface of the) light generating element. This may in embodiments be via a medium, like air, a gas, or a liquid or solid light guiding material.
  • one or more optics like a lens, a reflector, an optical filter, may be configured in the optical path between light generating element and item or material.
  • upstream and downstream relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”.
  • the light transmissive converter element is especially transmissive for at least part of the light source light propagating from the radiation input face to the radiation exit face. Further, the light transmissive converter element is especially further configured to convert part of the light source light propagating through the light transmissive converter element into converter element light.
  • Light transmissive converter elements are known in the art, such as e.g. described in W02006/054203, which is incorporated herein by reference.
  • the light transmissive converter element is especially configured to convert part of the light source light propagating through the light transmissive converter element into converter element light having a converter element light spectral power distribution differing from the first spectral power distribution of the first light source light.
  • the converter element light may especially be due to down conversion, see also above.
  • the converter element and first light source are configured relative to each other (during operation modes) that especially the optical axis (O) has a first angle (g) relative to the radiation input face.
  • This angle may be fixed or controllable (see also below). This angle may be selected from the range of larger than 0° and equal to or smaller than 90°. Especially, the angle may be selected from the range of 30-90° (see further below). Note that at 0° there will essentially be no light in-coupling which can progress as TIR light.
  • the light converter element is at least partly transmissive for the light source light
  • both converter element light (luminescent material light) and light source light may escape.
  • converter element light and light source light may emanate from the radiation exit face. Therefore, especially in embodiments in one or more operation modes of the lighting device the lighting device light comprises one or more of first light source light and converter element light emanating from the radiation exit face.
  • the system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation”.
  • mode may also be indicated as “controlling mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and/or after executing the mode one or more other modes may be executed.
  • control system may be available, that is adapted to provide at least the controlling mode.
  • the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible.
  • the operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e. “on”, without further tunability).
  • the control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer.
  • timer may refer to a clock and/or a predetermined time scheme. See further also below.
  • one or more of the first angle (g) and the beam shape of the first light source light relative to the radiation input face are controllable.
  • a plurality of modes of operation such as at least two, like at least three, such as at least five, like at least 8, such as at least 16.
  • a change between the modes of operation may be stepwise or stepless.
  • Control can be analogical or digital.
  • controlling and similar terms especially refer at least to determining the behavior or supervising the running of an element.
  • controlling and similar terms may e.g. refer to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc... Beyond that, the term “controlling” and similar terms may additionally include monitoring.
  • controlling and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element.
  • the controlling of the element can be done with a control system, which may also be indicated as “controller”.
  • the control system and the element may thus at least temporarily, or permanently, functionally be coupled.
  • the element may comprise the control system.
  • the control system and element may not be physically coupled. Control can be done via wired and/or wireless control.
  • the term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems.
  • a control system may comprise or may be functionally coupled to a user interface.
  • the control system may also be configured to receive and execute instructions form a remote control.
  • the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I-phone, a tablet, etc...
  • the device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system.
  • control system may (also) be configured to be controlled by an App on a remote device.
  • the control system of the lighting system may be a slave control system or control in a slave mode.
  • the lighting system may be identifiable with a code, especially a unique code for the respective lighting system.
  • the control system of the lighting system may be configured to be controlled by an external control system which has access to the lighting system on the basis of knowledge (input by a user interface of with an optical sensor (e.g. QR code reader) of the (unique) code.
  • the lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, WIFI, ZigBee, BLE or WiMAX, or another wireless technology.
  • the angle and/or beams shape By controlling the angle and/or beams shape it is controlled how the rays of the light source light enter the converter element. Under some angles and/or with specific beam shapes the (average) pathlength of the light source light through the converter element may longer whereas under other angles and/or with other specific beam shapes the (average) path length of the light source light through the converter element may be shorter.
  • a ratio of converter light power to light source light power of converter light and light source light emanating from the radiation exit face may be larger whereas in the latter embodiments the ratio of converter light power to light source light power of converter light and light source light emanating from the radiation exit face may be smaller.
  • the lighting device light may have a controllable spectral power distribution.
  • the invention may especially provide a lighting device configured to generate lighting device light having a controllable spectral power distribution. Further, the invention may also especially provide a way of adjusting the ratio converted to transmitted light in transparent luminescent converter.
  • the light transmissive converter element may have a length (L) defined by the radiation input face and the radiation exit window.
  • L the length defined by the radiation input face and the radiation exit window.
  • at least part of the light source light may enter the converter element at one end and at least part of the light source light that has entered the converter element may escape at another end of the converter element, especially together with converter light.
  • the radiation input face and the radiation exit window may be configured opposite of each other.
  • the light transmissive converter element may comprise a light transmissive body, more especially be a light transmissive body. Further, as indicated above, the light transmissive body may comprise the luminescent material.
  • the light transmissive body may have any shape, such as beam (or bar) like or rod like, however especially beam like (cuboid like). However, the light transmissive body may also be disk like, etc.
  • the light transmissive body such as the luminescent concentrator, might be hollow, like a tube, or might be filled with another material, like a tube filled with water or a tube filled with another solid light transmissive medium.
  • the invention is not limited to specific embodiments of shapes, neither is the invention limited to embodiments with a single exit window or outcoupling face. Below, some specific embodiments are described in more detail.
  • the light transmissive body have a circular cross-section, then the width and height may be equal (and may be defined as diameter).
  • the light transmissive body has a cuboid like shape, such as a bar like shape, and is further configured to provide a single exit window.
  • the light transmissive body may especially have an aspect ratio larger than 1, i.e. the length is larger than the width.
  • the light transmissive body is a rod, or bar (beam), or a rectangular plate, though the light transmissive body does not necessarily have a square, rectangular or round cross-section.
  • the light source is configured to irradiate one (or more) of the longer faces (side edge), herein indicated as radiation input face, and radiation escapes from a face at a front (front edge), herein indicated as radiation exit window.
  • the light source(s) may provide radiation to one or more side faces, and optionally an end face. Hence, there may be more than one radiation input face.
  • the generally rod shaped or bar shaped light transmissive body can have any cross-sectional shape, but in embodiments has a cross section the shape of a square, rectangle, round, oval, triangle, pentagon, or hexagon.
  • the ceramic or crystal bodies are cuboid.
  • the body may be provided with a different shape than a cuboid, with the light input surface having somewhat the shape of a trapezoid. By doing so, the light flux may be even enhanced, which may be advantageous for some applications.
  • the term “width” may also refer to diameter, such as in the case of a light transmissive body having a round cross section.
  • the elongated light transmissive body further has a width (W) and a height (H), with especially L>W and L>H.
  • the first face and the second face define the length, i.e. the distance between these faces is the length of the elongated light transmissive body.
  • These faces may especially be arranged parallel.
  • the length (L) is at least 2 cm, like 3-20 cm, such as 4-20 cm, such as at maximum 15 cm. Other dimensions may, however, also be possible, such as e.g. 0.5-2 cm.
  • Cross-sectional dimensions may be defined by a longest dimension LI and a shortest dimension L2, which in the case of a circular cross-section are identical, and in fact an infinite number of LI and L2 may be available. For the sake of simplicity, the diameter can be indicated with LI.
  • LI and L2 are identical and orthogonal.
  • L may in embodiments be especially at least 3L1, more especially 4L1, most especially at least 5L1.
  • L may in embodiments be at least 4L2, more especially 5L1, most especially at least 6L1.
  • L is especially at least 10 mm, more especially at least 20 mm, most especially at least 30 mm.
  • LI is especially in the range from 0.5-5 mm, more especially 0.8-4 mm, most especially 1-3 mm
  • L2 is especially in the range from 0.5-5 mm, more especially 0.8-4 mm, most especially 1-3 mm.
  • the light source, the length of the light transmissive body, the type of luminescent material and the concentration of the active species that converts the light source light may be selected such that under perpendicular irradiation with the light source light of the radiation input face a ratio of the amount of converted light to the amount of transmitted laser light, in terms of numbers of photons, is selected from the range of 0.1-0.9, such as selected from the range of 0.2-0.8.
  • the term active species may refer to an atom, ion, molecular group, or molecule that effectively is able to convert the light source light into luminescent material light, and thus provides the converter function to the light converter element.
  • the angle g of the optical axis relative to the radiation input face By changing the angle g of the optical axis relative to the radiation input face, and/or by changing the beam shape, there may be less or more total internal reflection.
  • there may be at least once total internal reflection In one or more operation modes, there may be at least once total internal reflection. Especially, in one or more operation modest there may be at least twice total internal reflection. Further, especially in one or more operation modest there may be at least three times total internal reflection.
  • One or more reflectors, or other optical elements may be applied to assist incoupling of first light source light (via the radiation input face) into the light transmissive converter element.
  • the term “reflector” may also refer to a plurality of (different) reflectors.
  • light incoupling may depend on the angle and the refractive index of the light transmissive converter element. Relative to the radiation input face, only certain angles may be accepted (i.e. coupled into the light transmissive converter element).
  • a first part of the angles under which the light source light is incoupled in the light transmissive converter element (via the radiation input face) may propagate through the light transmissive converter element essentially only via total internal reflection (TIR). This part may be indicated with Al. This first part will especially be at smaller angles g relative to the radiation input face (e.g. smaller than about 45° (i.e. an angle larger than about 45° with a normal to the radiation input face).
  • a second part of the angles under which the light source light is incoupled in the light transmissive converter element (via the radiation input face) may propagate through the light transmissive converter element essentially without total internal reflection (TIR).
  • This second part may be indicated with A2.
  • This second part will especially be at larger angles g relative to the radiation input face (e.g. larger than about 45° (i.e. an angle smaller than about 45° with a normal to the radiation input face).
  • the (first) light source light provided to the radiation input face may have an angle g of the optical axis O with the radiation input face and a beam shape such that at least 50%, more especially at least 70%, even more especially at least 80%, yet even more especially at least 90% of all photons of the (first) light source light propagate with or without internal reflection through the light transmissive converter element, i.e. is comprised by A1+A2, and is not rejected at the radiation input face as it has a too small angle g. Even more especially at least 95%, such as at least 98%, or even at least 99% of all photons of the (first) light source light propagate with or without internal reflection through the light transmissive converter element, i.e. is comprised by A1+A2. This may apply in embodiments to essentially all modes of operation.
  • the difference between A1 and A2 is as large as possible.
  • a first (extreme) mode beam shape and/or beam angle g of the (first) light source light may lead to especially least 60% A1 (of A1+A2), more especially at least 70% Al, most especially at least 80% Al, such as e.g. 85-90% Al.
  • a second (extreme) mode beam shape and/or beam angle g of the (first) light source light may lead to especially at least 90% A2 (of A1+A2), more especially at least 95% A2, most especially at least 98% A2, such as e.g. about 99-100% A2.
  • 30° ⁇ g ⁇ 90° i.e. within 0-60° relative to a normal to the radiation input face.
  • g and 180°-g are considered equivalent.
  • essentially all (first) light source light may be coupled into the light transmissive converter element (via the radiation input face).
  • active species may e.g. Eu 2+ or Ce 3+ .
  • Other active species may be quantum dots.
  • Yet other active species may be organic luminescent dyes.
  • luminescent materials may be selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively.
  • Embodiments of garnets especially include A3B5O12 garnets, wherein A comprises at least yttrium or lutetium and wherein B comprises at least aluminum.
  • Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce.
  • B comprises aluminum (Al), however, B may also partly comprise gallium (Ga) and/or scandium (Sc) and/or indium (In), especially up to about 20% of Al, more especially up to about 10 % of Al (i.e. the B ions essentially consist of 90 or more mole % of Al and 10 or less mole % of one or more of Ga, Sc and In); B may especially comprise up to about 10% gallium.
  • B and O may at least partly be replaced by Si and N.
  • the element A may especially be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu).
  • the garnet luminescent material comprises (Yi- x Lu x )3B50i2:Ce, wherein x is equal to or larger than 0 and equal to or smaller than 1.
  • Ce part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce.
  • Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, especially 0.1 to 2% (relative to A). Assuming 1% Ce and 10% Y, the full correct formula could be (Yo .i Luo .89 Ceo . oi)3Al50i2.
  • Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art.
  • Blue luminescent concentrators can be based on YSO (Y2SiC>5:Ce 3+ ), or similar compounds, or BAM (BaMgAhoOi7:Eu 2+ ), or similar compounds, especially configured as single crystal(s).
  • a red luminescent material may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2Si5N8:Eu.
  • europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations.
  • Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces.
  • the material (Ba,Sr,Ca)S:Eu can also be indicated as MS:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium.
  • Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca).
  • the material (Ba,Sr,Ca)2Si Nx:Eu can also be indicated as M2Si5N8:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound Sr and/or Ba.
  • M consists of Sr and/or Ba (not taking into account the presence of Eu), especially 50 to 100%, more especially 50 to 90% Ba and 50 to 0%, especially 50 to 10% Sr, such as Bai . sSro . sSENsiEu (i.e. 75 % Ba; 25% Sr).
  • Eu is introduced and replaces at least part of M, i.e. one or more of Ba, Sr, and Ca).
  • the material (Ba,Sr,Ca)AlSiN3:Eu can also be indicated as MAlSiN3:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium.
  • Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca).
  • Eu in the above indicated luminescent materials is substantially or only in the divalent state, as is known to the person skilled in the art.
  • luminescent material herein especially relates to inorganic luminescent materials, which are also sometimes indicated as phosphors. These terms are known to the person skilled in the art.
  • quantum dots and/or organic dyes may be applied, and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc. etc..
  • Quantum dots are small crystals of semiconducting material generally having a width or diameter of only a few nanometers. When excited by incident light, a quantum dot emits light of a color determined by the size and material of the crystal. Light of a particular color can therefore be produced by adapting the size of the dots.
  • Most known quantum dots with emission in the visible range are based on cadmium selenide (CdSe) with a shell such as cadmium sulfide (CdS) and zinc sulfide (ZnS).
  • Cadmium free quantum dots such as indium phosphide (InP), and copper indium sulfide (CuInS2) and/or silver indium sulfide (AgInS2) can also be used.
  • Quantum dots show very narrow emission band and thus they show saturated colors. Furthermore, the emission color can easily be tuned by adapting the size of the quantum dots. Any type of quantum dot known in the art may be used in the present invention. However, it may be preferred for reasons of environmental safety and concern to use cadmium-free quantum dots or at least quantum dots having a very low cadmium content.
  • quantum confinement structures should, in the context of the present application, be understood as e.g. quantum wells, quantum dots, quantum rods, tripods, tetrapods, or nano-wires, etcetera.
  • Organic phosphors can be used as well.
  • suitable organic phosphor materials are organic luminescent materials based on perylene derivatives, for example compounds sold under the name Lumogen® by BASF.
  • suitable compounds include, but are not limited to, Lumogen® Red F305, Lumogen® Orange F240, Lumogen® Yellow F083, and Lumogen® F170.
  • the light transmissive light converter element may comprise a light transmissive body, especially an elongated light transmissive body.
  • the (elongated) light transmissive ceramic or single crystalline body ceramic comprising an inorganic luminescent material.
  • Such light converter may be relatively stable, may have a good transmission, and may be relatively robust.
  • the light transmissive body may comprise light transmissive host material (thus not taking into account the luminescent material, or more especially in embodiments a luminescent species such as trivalent cerium), especially light transparent material for one or more wavelengths in the visible, such as in the green and red, and in general also in the blue.
  • Suitable host materials may comprise one or more materials selected from the group consisting of a transmissive organic material, such as selected from the amorphous polymers group, e.g.
  • the light transmissive material may comprise an aromatic polyester, or a copolymer thereof, such as e.g.
  • the light transmissive material is especially a polymeric light transmissive material.
  • the light transmissive material may comprise an inorganic material.
  • the inorganic light transmissive material may be selected from the group consisting of glasses, (fused) quartz, transmissive ceramic materials (such as garnets), and silicones. Glass ceramic materials may also be applied. Also, hybrid materials, comprising both inorganic and organic parts may be applied.
  • the light transmissive material comprises one or more of PMMA, transparent PC, or glass.
  • the light transmissive light converter element may be at least partly enclosed by one or more of a reflective element and a thermally conductive element.
  • a thermally conductive element may be a heat sink.
  • a thermally conductive element may comprise, or essentially consist of a thermally conductive material.
  • a thermally conductive material may have a thermal conductivity of at least about 20 W/m/K, like at least about 30 W/m/K, such as at least about 100 W/m/K, like especially at least about 200 W/m/K.
  • the thermally conductive material may comprise a metal, such as copper or aluminum.
  • the thermally conductive material may comprise graphite or a ceramic material.
  • thermally conductive element may be reflective for light source light and/or converter light.
  • both functions may be provided by a single element.
  • the term “element” may also refer to a plurality of (different) elements (each having one or both of these functions). For instance, in this way it may also be promoted that light escaped essentially only from the radiation exit face, as the radiation input face and the radiation exit face may essentially the only parts of the light transmissive light converter element light may enter the light transmissive light converter element or leave the light transmissive light converter element, respectively.
  • side face(s) of the converter element especially all side faces, are shielded by a reflector such that essentially only light may exits from the radiation exit face.
  • such reflective surface may be provided by a thermally conductive element having reflective properties.
  • the element comprises a monolithic block enclosing the light transmissive light converter element at (all) the side face(s).
  • the element may comprise a highly reflective (Miro) reflector to improve optical recycling.
  • Miro refers to reflective material, especially from Alanod / Westlake Metal Ind., that have a high (surface) reflectivity.
  • reflective material is highly specular reflective, with equal to or less than 10%, such as equal to or less than 6% diffuse reflection under perpendicular radiation, the remainder being specular reflection, especially under irradiation with visible light.
  • the Miro reflective material may be applied (herein) as specular reflector.
  • the body holder structure may comprise AlSiMgMn.
  • the (reflective and/or thermally conductive) element may especially not be in optical contact with the light transmissive light converter element.
  • the distance is at least wavelength of interest, more especially at least twice the wavelength of interest.
  • an average distance is at least l ⁇ , such as at least 1.5* l ⁇ , like at least 2* l ⁇ , such as especially about 5* l ⁇ , wherein l ⁇ is the wavelength of interest.
  • the average distance is in embodiments not larger than 50 pm, such as not larger than 25 pm, like not larger than 20 pm, like not larger than 10 pm, for purposes of good thermal contact.
  • such average minimum distance may apply to a reflector and/or optical filter configured at e.g. an end face, or other optical components as well.
  • an element may comprise both heat sinking function a reflection function, such as a heat sink with a reflective surface, or a reflector functionally coupled to a heat sink.
  • the wavelength of interest may especially be the wavelength at maximum emission of the luminescence of the luminescent material.
  • the reflectivity of the (reflective) element is especially high (under perpendicular irradiation), such as at least 85%, like at least 88%, such as especially at least 92%.
  • an optical element configured to allow transmission from the (first) light source light in a direction of the light transmissive light converter element and to promote reflection of at least converter element light in a direction of the (first) light source may be configured between the (first) light source and the light transmissive light converter element. This may further promote outcoupling of the converter element light (and (light) source light) essentially only at the radiation exit face. For instance, this may be a wavelength selective reflector. For instance, a dichroic mirror may be applied.
  • the term “light converter element”, and similar terms, may also refer to a plurality of (different) light converter elements. Such light converter elements may be configured parallel or serial. In other embodiments, two or more light converter elements may be configured parallel and/or two or more light converter elements may be configured in series. Using two or more different light converters may also allow provide two different types of light converter element light. For instance, in embodiments the light source is configured to generate blue radiation, and first light converter element is configured to convert at least part of the first light source light into green and/or yellow radiation and a second light converter element is configured to converter at least part of the first light source light into red radiation.
  • the lighting device light may comprise one or more of (i) first light source light, (ii) converter element light of a first light converter element, and (iii) converter element light of a second light converter element.
  • first light source light e.g., first light source light
  • converter element light of a first light converter element e.g., converter element light of a second light converter element.
  • second light converter element e.g., converter element light of a second light converter element.
  • the ratio of the amount of converted light to the amount of transmitted laser light may be controlled by using a control system (see also above).
  • the lighting device further comprises a control system configured to control the one or more of the first angle (g) and the beam shape of the first light source light relative to the radiation input face.
  • the control system may in embodiments control the first angle and/or the control system may control the beam shape of the first light source light relative to the radiation input face.
  • the lighting device may further comprise an actuator.
  • the actuator may be used to move the converter relative to the light source or the light source relative to the converter or move both relative to each other.
  • the lighting device may further comprise an actuator configured to control the first angle (g), wherein the control system is configured to control the actuator, and wherein the actuator is configured to control the first angle (g) by one or more of (i) moving the first light source relative to the light transmissive converter element, and (ii) moving the light transmissive converter element relative to the first light source.
  • the term “actuator” may also refer to a plurality of (different) actuators.
  • the optical element may be used to impose a polarization on the first light source light or to change a polarization of the first light source light.
  • the optical element may be used to pattern the first light source light.
  • the optical element may be configured to collimate the first light source light. In embodiments, the optical element may be configured to collimate the first light source light.
  • the lighting device may further comprise a first optical element, configured downstream of the first light source and upstream of the light transmissive converter element.
  • the first optical element may be configured in a reflective configuration or in a transmissive configuration relative to the first light source (or relative to the first light source light).
  • the actuator may be configured to control the first angle (g) by one or more of (i) moving the first light source relative to first optical element, (ii) moving the first optical element relative to the light transmissive converter element, and (iii) moving the light transmissive converter element relative to the first optical element.
  • moving may in this context e.g. refer to moving one or more elements such that a mutual angle changes, like e.g. turning, rotating, tilting, etc...
  • the first optical element may especially be used to control the first angle.
  • a second optical element may be applied, especially to control the beam shape.
  • the lighting device may further comprising a second optical element, configured downstream of the first light source and upstream of the light transmissive converter element, wherein the second optical element is configured to control one or more of the first angle (g) and the beam shape of the first light source light relative to the radiation input face, and wherein the control system is configured to control the second optical element.
  • a second optical element may be controllable via electrical power, though the use of a (mechanical) actuator may in embodiments also be possible.
  • the second optical element may be configured to control the beam shape of the first light source light, wherein the second optical element comprises one or more of (i) an electrically tunable liquid crystal device and (ii) a digital micromirror device (DMD).
  • DMDs are e.g. comprised by DLPs (digital light processing systems).
  • the second optical element may be configured in a reflective configuration or in a transmissive configuration relative to the first light source (or relative to the light source light), especially in a transmissive configuration.
  • the first optical element may be (electrically) controllable.
  • the second optical element may be (electrically) controllable.
  • the first optical element may be a switchable optical element.
  • the second optical element may be a switchable optical element.
  • (collimated) light source light may imping on the switchable optical element under an angle of about 90°, i.e. essentially perpendicular.
  • the light source light may in specific embodiments also imping on the converter element under an angle g of about 90°, i.e.
  • the light source light may have a relatively minimum path length in the converter element.
  • the switchable optical element the light source light can be redirected to angles g different from 90°. In this way the path length of the laser light may be increased.
  • the light source light may imping on the switchable optical element under an angle unequal to 90° in the off-mode.
  • the laser light may also be impinging the converter under an angle g unequal to 90°.
  • the first light source light may have in the off-mode not the minimum path length.
  • the first optical element and/or the second optical element are configured in a reflective configuration or in a transmissive configuration relative to the first light source.
  • the first optical element may be configured to have one or more impacts of at least part of the light source light received by the optical element: (i) refract the light source light, (ii) diffract the light source light, (iii) reflect the light source light, and (iv) scattering the light source light.
  • beam sweeping may be possible and it may e.g. be possible to control the angle g in many steps. However, sweeping may mainly be possible in one direction.
  • light source light such as laser light
  • this can be done in more directions e.g. 2 or 4 direction simultaneously. This may provide an improved homogenous beam.
  • intermediate states i.e. angles between the 0 th and 1 st order, etc., may not be chosen.
  • beam sweeping may be possible and it may e.g. be possible to control the angle g in many steps.
  • sweeping may mainly be possible in one direction.
  • scattering (collimated) light source light such as a (collimated) laser beam
  • a (collimated) laser beam can be redirected to many different angles and thus results in many different path lengths and thus various degrees of partial conversion may be possible.
  • the light may be redirected to many angles, it may be more difficult to realize a contrast between the light wherein the switchable optical element is in the on-mode and off-mode.
  • the extend of refraction, diffraction, reflection, and/or scattering may thus be controllable, and differ from one mode to the other.
  • the beam shape and/or beam angle may be controlled mechanically and or electronically (and/or magnetically (and/or optically)).
  • first light source and light converter element(s) may be used to generate one or more types of light converter light.
  • a blue pump light source may be used as first light source, which pumps a green and/or yellow emitting light converter element.
  • the lighting device may further comprising a second light source configured to generate second light source light having a second spectral power distribution, different from the first spectral power distribution and the converter element light spectral power distribution, wherein the lighting device is configured to generate in one or more operation modes of the one or more operation modes lighting device light comprising the second light source light and one or more of first light source light and converter element light.
  • a second light source may be a laser light source but may also be another type of light source. For the definition of a light source, see also above.
  • the term “second light source” may also refer to a plurality of (different) second light sources.
  • a blue pump light source may be used as first light source, which pumps a green and/or yellow emitting light converter element
  • a second light source may be configured to generate red second light source light.
  • the lighting device light may comprise e.g. generate in one or more operation modes of the one or more operation modes lighting device light comprising red second light source light and one or more of the blue pump light and the green and/or yellow converter element light. This may e.g. allow a larger color gamut, and/or a higher CRI white light, etc.
  • the first light source(s) and the second light source(s) are individual controllable.
  • color point and/or color rendering index may be controllable.
  • the light sources may also be indicated as “first light source”, “second light source”, etc...
  • spectral distribution may further be controlled, as e.g. in embodiments different sets may be controlled individually.
  • the lighting device is configured to generate in one or more operation modes of the one or more operation modes white lighting device light having a color rendering index selected from the range of at least 80 and having a correlated color temperature selected from the range of 1800-10000 K, like 2000-10000 K, such as at least 2700 K, like at least 3000 K, such as especially at least 5000 K, such as in embodiments especially 6500-10000 K.
  • the invention also provides a lighting system comprising one or more lighting devices as defined herein and a system control system comprising the one or more control systems, wherein the lighting system is configured to generate lighting system light, wherein in one or more operation modes of the lighting system the lighting system light comprises one or more of the lighting device light of the one or more lighting devices.
  • the invention provides further a lighting system comprising two or more lighting devices according to any one of the preceding claims and a system control system comprising the two or more control systems, wherein the lighting system is configured to generate lighting system light, wherein in one or more operation modes of the lighting system the lighting system light comprises one or more of the lighting device light of the two or more lighting devices.
  • controllability may be lower than when two or more light sources are applied and two or more light converter elements, as with the latter embodiments, it may also in embodiment be possible to control the different (first) light sources individually.
  • the lighting system may be configured to generate in one or more operation modes of the one or more operation modes white lighting system light having a color rendering index selected from the range of at least 80 and having a correlated color temperature selected from the range of 6500-10000 K.
  • the invention also provides a projection system or a luminaire comprising the lighting device as defined herein or the lighting system as defined herein.
  • the lighting device or the lighting system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting.
  • office lighting systems household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting.
  • white light herein, is known to the person skilled in the art. It especially relates to light having a correlated color temperature (CCT) between about 1800 K and 20000 K, such as between 2000 and 20000 K, especially 2700-20000 K, for general lighting especially in the range of about 2700 K and 6500 K.
  • CCT correlated color temperature
  • the correlated color temperature (CCT) may especially be in the range of about 7000 K and 20000 K.
  • the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL.
  • violet light or “violet emission” especially relates to light having a wavelength in the range of about 380-440 nm.
  • blue light or “blue emission” especially relates to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues).
  • green light or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm.
  • yellow light or “yellow emission” especially relate to light having a wavelength in the range of about 570- 590 nm.
  • range light or “orange emission” especially relate to light having a wavelength in the range of about 590-620 nm.
  • red light or “red emission” especially relate to light having a wavelength in the range of about 620-780 nm.
  • pink light or “pink emission” refers to light having a blue and a red component.
  • visible refers to light having one or more wavelengths in the range of about 380-780 nm.
  • FIG. 1-4 schematically depict some embodiments
  • FIGS. 5a-5b schematically depict some further embodiments and aspects
  • FIGS. 6a-6b schematically depict further embodiments.
  • FIGS. 7a-7b schematically depict yet some further embodiments.
  • the schematic drawings are not necessarily to scale.
  • Fig. 1 schematically depicts an embodiment of the lighting device 1000.
  • the device 1000 is configured to generate lighting device light 1001 having a controllable spectral power distribution.
  • the lighting device 1000 comprises (i) a first light source 100.
  • the first light source 100 comprises a laser light source 10.
  • the first light source 100 is configured to generate first light source light 101 having an optical axis O, a beam shape, and a first spectral power distribution.
  • the first light source light 101 is essentially laser light source light.
  • the lighting device further comprises (ii) a light transmissive light converter element 200 comprising a radiation input face 111.
  • This radiation input face 111 is configured in a light receiving relationship with the first light source 100.
  • the light transmissive converter element 200 comprises further a radiation exit face 112.
  • the afore-mentioned optical axis O has a first angle g relative to the radiation input face 111.
  • g is about 90°; in the lower drawing g is smaller than 90°.
  • the light transmissive converter element 200 is transmissive for at least part of the light source light 101 propagating from the radiation input face 111 to the radiation exit face 112.
  • the light transmissive converter element 200 is further configured to convert part of the light source light 101 propagating through the light transmissive converter element 200 into converter element light 201 having a converter element light spectral power distribution differing from the first spectral power distribution of the first light source light 101, wherein in one or more operation modes of the lighting device 1000 the lighting device light 1001 comprises one or more of first light source light 101 and converter element light 201 emanating from the radiation exit face 112, wherein one or more of the first angle g and the beam shape of the first light source light 101 relative to the radiation input face 111 are controllable (see further also below).
  • the light transmissive converter element 200 has a length L defined by the radiation input face 111 and the radiation exit window 112. Hence, in embodiments the radiation input face (111) and the radiation exit window (112) may be configured opposite of each other.
  • the lighting device 1000 may further comprising a control system 300 configured to control the one or more of the first angle g and the beam shape of the first light source light 101 relative to the radiation input face 111.
  • the lighting device 1000 may further comprising an actuator 310 configured to control the first angle g.
  • the control system 300 may be configured to control the actuator 310, and wherein the actuator 310 is configured 310 to control the first angle g by one or more of (i) moving the first light source 100 relative to the light transmissive converter element 200, and (ii) moving the light transmissive converter element 200 relative to the first light source 100.
  • the lighting device 1000 may further comprise a first optical element 350, configured downstream of the first light source 100 and upstream of the light transmissive converter element 200.
  • Such actuator 310 may be configured 310 to control the first angle g by one or more of (i) moving the first light source 100 relative to first optical element 350, (ii) moving the first optical element 350 relative to the light transmissive converter element 200, and (iii) moving the light transmissive converter element 200 relative to the first optical element 350.
  • Figs. 1 shows an embodiment wherein the light source 100 is moved relative to the light transmissive converter element 200 (with or without the actuator 310);
  • Fig. 2 schematically depicts an embodiment wherein the first optical element 350 is moved relative to the light transmissive converter element 200.
  • Fig. 3 schematically depicts an embodiment wherein the optical axis may be changed with an electrically controllable first optical element 350.
  • the first optical element 350 may comprise one or more of (i) an electrically tunable liquid crystal device and (ii) a digital micromirror device (DMD).
  • DMD digital micromirror device
  • Fig. 4 schematically depicts an embodiment of the lighting device 1000, further comprising a second optical element 360, configured downstream of the first light source 100 and upstream of the light transmissive converter element 200.
  • Such second optical element 360 may be configured to control one or more of the first angle g and the beam shape of the first light source light 101 relative to the radiation input face 111.
  • the control system 300 is especially configured to control the second optical element 360.
  • Fig. 4 especially schematically depicts an embodiment wherein the second optical element 360 is configured to control the beam shape of the first light source light 101.
  • the beam cross-section at the radiation input face 111 is e.g. essentially the same as the area of the radiation input face 111 (lower picture)
  • the ratio of converted light 201 to light source light 101 at the radiation exit face 122 will be different from the ratio of converted light 201 to light source light 101 at the radiation exit face 122 when the beam is very narrow (upper picture).
  • the ratio can also be controlled.
  • the second optical element 360 comprises one or more of (i) an electrically tunable liquid crystal device and (ii) a digital micromirror device.
  • the optical elements are used in transmissive configurations.
  • the first optical element 350 and/or the second optical element 360, respectively may be configured in a reflective configuration or in a transmissive configuration relative to the first light source 100.
  • controllable scattering or (controllable) diffraction may be applied.
  • Fig. 5a schematically depicts an embodiment of the converter element 200.
  • the converter element 200 has a length L.
  • Cross-sectional dimensions may be defined by a longest dimension LI and a shortest dimension L2, which in the case of a circular cross-section are identical, and in fact an infinite number of LI and L2 may be available.
  • the diameter can be indicated with LI.
  • LI and L2 are identical and orthogonal.
  • Reference 210 indicate a face.
  • the end faces are indicated with references 211 and 212, respectively. In embodiments, they may provide the radiation input face 111 and radiation exit face, respectively.
  • the side faces are indicated with references 214. In the case of a circular cross-section, there is a single side face 214; in the case of a triangular cross- section, there are three side faces 214.
  • the radiation input face 111 and radiation exit face 112 are not necessary comprised by parallel configured faces 210, respectively. They may in other embodiments (not depicted), also be comprised by orthogonally configured faces 210, respectively. In specific embodiments, they may also be comprised by the same face 210. Especially, however, they may be comprised by end faces 211 and 212, respectively.
  • the light transmissive light converter element 200 may comprise an elongated light transmissive body, wherein the elongated light transmissive ceramic or single crystalline body ceramic comprising an inorganic luminescent material.
  • Fig. 5b schematically depicts an embodiment wherein at least part of the transmissive light converter element 200, such as in embodiments at least part(s) of one or more of the side faces, may be provided with a reflector or are in thermal contact with a heat sink.
  • Reference 410 refers to an element that may have reflective and/or heat sink properties, like a reflective heat sink. Reflection is especially relative to the light source light and/or the converter light. Under perpendicular radiation, the reflection can be at least 80%, like at least 90%, such as at least 95%.
  • Fig. 5b also schematically depicts an embodiment with an optical element 420 downstream of the light converter element 200.
  • the optical element 420 may comprise a collimator, like a compound parabolic concentrator (CPC) or similar type of optical element. It may be desirable to provide an optical element 420 (downstream of the light converter element), for instance for beam shaping the lighting device light.
  • the optical element may be used to impose a polarization on the lighting device light or to change a polarization of the lighting device light.
  • the optical element may be used to pattern the lighting device light.
  • the optical element may be configured to collimate the lighting device light.
  • the optical element may be configured to collimate the lighting device light.
  • Fig. 5c schematically depicts an embodiment wherein essentially all side faces are surrounded by the element 410 that may have reflective and/or heat sink properties, like a reflective heat sink.
  • element 410 may also refer to a plurality of (different) elements.
  • Fig. 5d schematically depicts the effect of changing the beam shape and/or angle g of the optical axis O relative to the radiation input face.
  • One curve has a lower ratio of converted to transmitted light (solid curve), and one curve has a higher ratio of converted to transmitted light (dashed curve). In the latter curve, there may have been more total internal reflection (TIR) than in the former.
  • TIR total internal reflection
  • Fig. 5d schematically depicts two modes of operation (or controlling modes). Especially, there may be a plurality of modes of operation, such as at least two, like at least three, such as at least five, like at least 8, such as at least 16.
  • Fig. 6a schematically depicts an embodiment wherein the lighting device 1000 further comprises a second light source 100” (the first light source is indicated with reference 100’) configured to generate second light source light 101” having a second spectral power distribution, different from the first spectral power distribution and the converter element light spectral power distribution.
  • the lighting device 1000 may be configured to generate in one or more operation modes of the one or more operation modes lighting device light 1001 comprising the second light source light 101” and one or more of first light source light 101 and converter element light 201.
  • the second light source 100 may also be a laser light source, and may use a similar principle as described above in relation to the first light source.
  • Fig. 6b schematically depicts an embodiments of the lighting device 1000, further comprising a second light source 100” configured to generate second light source light 101” having a second spectral power distribution, different from the first spectral power distribution and the converter element light spectral power distribution, wherein also the second light source light 101” may be partially transmitted and partially converted, and wherein the ratio can be controlled.
  • Fig. 6b also schematically depicts an embodiment wherein a third light source 100’”, based on the same principle is available. Note that different method may be used to control the different ratios.
  • Fig. 6b schematically depicts an embodiments of the lighting device 1000, further comprising a second light source 100” configured to generate second light source light 101” having a second spectral power distribution, different from the first spectral power distribution and the converter element light spectral power distribution, wherein also the second light source light 101”
  • Fig. 6b also schematically depicts two converter elements 200, in indicated with references 200’ and 200”.
  • first light source light 10G, and/or the second light source light 101”, and/or the third light source light 10G”, converter element light 20 G and 201”, may be generated.
  • Figs. 6a and 6b, and other figures, may effectively also depict a lighting system comprising one or more lighting devices 1000.
  • Figs. 7a and 7b schematically depict embodiments of a lighting system 2000 comprising two or more lighting devices 1000 and a system control system 2300 comprising the two or more control systems 300, wherein the lighting system 2000 is configured to generate lighting system light 2001, wherein in one or more operation modes of the lighting system 2000 the lighting system light 2001 comprises one or more of the lighting device light 1001 of the two or more lighting devices 1000.
  • the lighting device or the lighting system may be configured to generate in one or more operation modes of the one or more operation modes white lighting device light or lighting system light, respectively, having a color rendering index selected from the range of at least 80 and having a correlated color temperature selected from the range of 6500-10000 K.
  • Figs. 7a and 7b also schematically depict a luminaire 2, or a projection system 1, comprising the lighting device 1000 or the lighting system 2000.
  • the terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art.
  • the terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed.
  • the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.
  • a phrase “item 1 and/or item 2” and similar phrases may relate to one or more of item 1 and item 2.
  • the term “comprising” may in an embodiment refer to "consisting of but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species”.
  • the invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer.
  • a device claim, or an apparatus claim, or a system claim enumerating several means, several of these means may be embodied by one and the same item of hardware.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
  • the invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.
  • the invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.
  • the invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.

Abstract

L'invention concerne un dispositif d'éclairage (1000) configuré pour générer une lumière de dispositif d'éclairage (1001) ayant une distribution de puissance spectrale réglable, le dispositif d'éclairage (1000) comprend (i) une première source de lumière (100), la première source de lumière (100) comprend une source de lumière laser (10), la première source de lumière (100) est configurée pour générer une première lumière de source de lumière (101) ayant un axe optique (O), une forme de faisceau et une première distribution de puissance spectrale, et (ii) un élément convertisseur de lumière transmettant la lumière (200) comprenant une face d'entrée de rayonnement (111), configurée dans une relation de réception de lumière avec la première source de lumière (100), et une face de sortie de rayonnement (112), l'axe optique (O) présente un premier angle (γ) par rapport à la face d'entrée de rayonnement (111), l'élément convertisseur transmettant la lumière (200) est transmissif pour au moins une partie de la lumière de source de lumière (101) se propageant à partir de la face d'entrée de rayonnement (111) à la face de sortie de rayonnement (112), l'élément convertisseur transmettant la lumière (200) est en outre configuré pour convertir une partie de la lumière de source de lumière (101) se propageant à travers l'élément convertisseur transmettant la lumière (200) en lumière d'élément convertisseur (201) ayant une distribution de puissance spectrale de lumière d'élément de convertisseur différente de la première distribution de puissance spectrale de la première lumière de source de lumière (101) dans laquelle, dans un ou plusieurs modes de fonctionnement du dispositif d'éclairage (1000) la lumière du dispositif d'éclairage (1001) comprend une ou plusieurs des premières lumières de source de lumière (101) et une lumière d'élément convertisseur (201) émanant de la face de sortie de rayonnement (112), un ou plusieurs parmi le premier angle (γ) et la forme de faisceau de la première lumière de source de lumière (101) par rapport à la face d'entrée de rayonnement (111) étant contrôlables.
PCT/EP2020/072474 2019-08-13 2020-08-11 Rapport réglable de lumière converti en lumière transmise dans un convertisseur luminescent transparent WO2021028426A1 (fr)

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EP19191384.7 2019-08-13

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WO2023274859A1 (fr) * 2021-06-29 2023-01-05 Signify Holding B.V. Ensemble photoréacteur
WO2023151980A1 (fr) * 2022-02-08 2023-08-17 Signify Holding B.V. Dissipateur thermique comprenant une fente à logo fermé permettant de pomper un corps de luminophore cylindrique

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WO2017036789A1 (fr) * 2015-09-01 2017-03-09 Philips Lighting Holding B.V. Système d'éclairage de viande à efficacité et sursaturation rouge améliorées
WO2017157705A1 (fr) 2016-03-15 2017-09-21 Philips Lighting Holding B.V. Dispositif électroluminescent
WO2018210735A1 (fr) * 2017-05-16 2018-11-22 Philips Lighting Holding B.V. Mélange de couleurs dans une source de lumière laser
US20190097722A1 (en) * 2017-09-28 2019-03-28 Soraa Laser Diode, Inc. Intelligent visible light with a gallium and nitrogen containing laser source
US20190097092A1 (en) 2017-09-25 2019-03-28 Panasonic Intellectual Property Management Co., Ltd. Lighting device

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WO2006054203A1 (fr) 2004-11-18 2006-05-26 Philips Intellectual Property & Standards Gmbh Dispositif electroluminescent pourvu d'une structure de conversion
WO2017036789A1 (fr) * 2015-09-01 2017-03-09 Philips Lighting Holding B.V. Système d'éclairage de viande à efficacité et sursaturation rouge améliorées
WO2017157705A1 (fr) 2016-03-15 2017-09-21 Philips Lighting Holding B.V. Dispositif électroluminescent
WO2018210735A1 (fr) * 2017-05-16 2018-11-22 Philips Lighting Holding B.V. Mélange de couleurs dans une source de lumière laser
US20190097092A1 (en) 2017-09-25 2019-03-28 Panasonic Intellectual Property Management Co., Ltd. Lighting device
US20190097722A1 (en) * 2017-09-28 2019-03-28 Soraa Laser Diode, Inc. Intelligent visible light with a gallium and nitrogen containing laser source

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023274859A1 (fr) * 2021-06-29 2023-01-05 Signify Holding B.V. Ensemble photoréacteur
WO2023151980A1 (fr) * 2022-02-08 2023-08-17 Signify Holding B.V. Dissipateur thermique comprenant une fente à logo fermé permettant de pomper un corps de luminophore cylindrique

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