WO2013150429A1 - Agencement optique pour éclairage ascendant et descendant - Google Patents

Agencement optique pour éclairage ascendant et descendant Download PDF

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Publication number
WO2013150429A1
WO2013150429A1 PCT/IB2013/052540 IB2013052540W WO2013150429A1 WO 2013150429 A1 WO2013150429 A1 WO 2013150429A1 IB 2013052540 W IB2013052540 W IB 2013052540W WO 2013150429 A1 WO2013150429 A1 WO 2013150429A1
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WO
WIPO (PCT)
Prior art keywords
wavelength converting
light
exit window
light exit
optical arrangement
Prior art date
Application number
PCT/IB2013/052540
Other languages
English (en)
Inventor
Ties Van Bommel
Rifat Ata Mustafa Hikmet
Original Assignee
Koninklijke Philips N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips N.V. filed Critical Koninklijke Philips N.V.
Publication of WO2013150429A1 publication Critical patent/WO2013150429A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00—Lighting devices intended to be free-standing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/08—Combinations of only two kinds of elements the elements being filters or photoluminescent elements and reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
    • F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/05—Optical design plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0003—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being doped with fluorescent agents
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type

Definitions

  • the present invention relates to an optical arrangement, and especially to an optical arrangement for up-down lighting.
  • Up-down lighting arrangements are used in indoor lighting arrangements to provide a desired lighting environment. Such indoor lighting arrangements may be arranged in an office to provide light both up towards the ceiling and down towards the floor or towards a work space. In up-down lighting arrangements it may be desirable to have different colors or different color temperatures of light exiting the arrangement in the different directions.
  • An example of such arrangement is illustrated in fig. 1, wherein the lighting arrangement comprises an up light exit window and a down exit window, and wherein light exiting through the respective exit windows has different color or different color temperature.
  • light sources are arranged at each light exit window to provide the light exiting the respective light exit window.
  • the light sources at the up light exit window are adapted to provide light through the up light exit window of a first color or color temperature
  • the light sources at the down light exit window are adapted to provide light through the down light exit window of a second color or color temperature which differs from the first color or color temperature.
  • Such arrangement requires a large amount of light sources at the light exit windows. Further it may be difficult to control the color or color temperature of the outgoing light through the light exit windows.
  • an optical arrangement comprising an optical mixing chamber defined by at least one surrounding wall, a first light exit window and a second light exit window arranged opposite to said first light exit window, at least one solid state light source adapted to emit primary light and arranged on the at least one surrounding wall, at least one wavelength converting member arranged on an inner surface of said first light exit window and adapted to convert the wavelength of at least a part of the primary light from the at least one light source.
  • the optical arrangement further comprises a reflective member arranged on said inner surface of said first light exit window. The reflective member is adapted to allow said primary light and/or wavelength converted light to pass through said first light exit window.
  • Such optical arrangement may provide light exiting the two light exit windows having different color or color temperature.
  • the optical arrangement may further only need one set of light sources comprising at least one light source.
  • This light source may be arranged at a surrounding wall, which surrounding wall may be arranged proximate both light exit windows. The light from the light source may thereby be mixed in the optical mixing chamber and exit through the windows.
  • the light source may be arranged remotely from the wavelength converting member.
  • the wavelength converting member may receive a part of the light from the light source and convert the wavelength of that part.
  • the wavelength converted light may thereby be directed to exit the arrangement through one of the light exit windows.
  • the wavelength converted light may be converted to a different color or different color temperature compared to the original light from the light source.
  • the remaining light with the original wavelength may be directed through the other light exit window, or through both light exit windows.
  • the wavelength converting member may comprise a luminescent material such as phosphor.
  • the wavelength converting layer may be arranged on the reflective layer.
  • the wavelength converted light may be directed by the reflective member towards the second light exit window.
  • the light exiting the second light exit window may thereby be controlled by means of the wavelength converting member and reflective member arranged on the inside of the first light exit window. The difference in color or color temperature of the light exiting the first light exit window compared to the light exiting the second light exit window may become larger.
  • the wavelength converted light may exit mainly through the second light exit window, and the non-converted light may exit through both the first and the second light exit window.
  • the light exiting through the second light exit window may thereby be a mix of the wavelength converted light and the non-converted light, i.e. comprise relatively more converted light than the light exiting through the first light exit window.
  • the light may be mixed in the mixing chamber before exiting the window.
  • the light exiting the second light exit window may due to the converted wavelength of the wavelength converted light have a different color or color temperature than the light exiting through the first light exit window.
  • the first light exit window may be a light exit window directed upwards
  • the second light exit window may be a light exit window directed downwards when the optical arrangement is arranged in a up- down lighting direction.
  • the wavelength converting member may comprise an organic luminescent material.
  • the position and the bandwidth of the luminescence spectrum for organic phosphors may be designed to be anywhere in the visible range to obtain high efficacy.
  • the organic luminescent material may be an organic phosphor.
  • Organic phosphors may further be much cheaper than inorganic equivalents.
  • the organic luminescent material may efficiently convert the wavelength of incoming light from the light source to change the color or color temperature of the light.
  • the reflective member may comprise at least two spaced apart reflective members.
  • the reflective member When the reflective member comprises a plurality of reflective domains that are spaced apart, light may pass between the reflective domains and exit through the first light exit window.
  • the size of the reflective domains may control the light respective outputs through the first and second light exit windows.
  • the wavelength converting member may be arranged on the reflective domain, and the wavelength converting member may comprise a plurality of wavelength converting members each arranged on a respective reflective domain
  • the at least one wavelength converting member may comprise at least two wavelength converting domains, wherein the wavelength converting domains may have different wavelength converting properties.
  • the optical arrangement may comprise a wavelength converting member comprising at least two wavelength converting domains having different properties.
  • the properties of each wavelength converting domain may be adapted with regard to the location of that domain in relation to the light source.
  • Each domain of the wavelength converting member may comprise only one wavelength converting member portion.
  • the wavelength converting domains may have different sizes.
  • the wavelength converting domains may be of different sizes.
  • the size of each domain may be adapted with regard to the location of the domain in relation to the light source.
  • the wavelength converting domains may be smaller or larger with increasing distance to the light source. This may provide a more homogenous light output from the second light exit window.
  • Each wavelength converting domain may be provided on a reflective member.
  • the reflective members may have a corresponding size as the respective wavelength converting domain.
  • all reflective members may have a common size, with different sized wavelength converting domains arranged thereon. The size may thereby be varied to control the color or color temperature of the total light output through the second light exit window.
  • the wavelength converting domains may have different thickness.
  • the wavelength converting domains may be of different thickness.
  • the thicknesses of each domain may be adapted with regard to the location of the domain in relation to the light source.
  • the wavelength converting domains may be thinner or thicker the longer distance there is from the wavelength converting domain to the light source. This may provide a more homogenous light output from the second light exit window.
  • the thickness may thereby be varied to control the color or color temperature of the total light output through the second light exit window.
  • the wavelength converting domains may comprise different wavelength converting materials.
  • the different materials may be chosen with respect to the location of each respective domain in relation to the light source.
  • the wavelength converting domains may be of wavelength converting materials varying with the distance from the wavelength converting domain to the light source. This may provide a more homogenous light output from the second light exit window.
  • the different wavelength converting materials may provide different wavelength of the light from the wavelength converting domains. The materials may thereby be varied to control the color or color temperature of the total light output through the second light exit window.
  • the wavelength converting materials may be luminescent materials.
  • the wavelength converting member may comprise at least two layers with different wavelength converting material.
  • the light conversion properties for the wavelength converting member may be controlled further.
  • the converted light from the wavelength converting member may be different in different direction due to different composition of a first and a second wavelength converting material in the wavelength converting member.
  • the wavelength converting materials may be luminescent materials.
  • the wavelength converting member may comprise at least two wavelength converting domains, and the combinations of wavelength converting materials of the two layers in the wavelength converting domains differ.
  • the composition of wavelength converting materials in each wavelength converting domain may be chosen with regard to the distance of each wavelength converting domain to the light source.
  • the composition of the wavelength converting materials may be selected to provide a desired light output through the light exit windows.
  • the first light exit window and/or the second light exit window may be translucent layers.
  • Such translucent layer may be a diffuser such as a scatterer comprising e.g. Ti0 2 or AI 2 O 3 particles.
  • the type of translucent layer in the light exit windows may be adapted with regard to the wavelength converting member to be used.
  • the material in the translucent layer may be selected to provide a desired back reflection property for the light exit windows.
  • the optical arrangement may further comprise a second wavelength converting member arranged on an inner surface of the second light exit window.
  • Wavelength converting members may be provided at the inner surface of both the first light exit window and the second light exit window.
  • the output light through both the first and the second light exit windows may thereby be controlled by means of wavelength converting members.
  • the light output through the first light exit window may substantially be a mixture of non-converted light from the light source and light converted by the second wavelength converting member.
  • the light output through the second light exit window may substantially be a mixture of non-converted light from the light source and light converted by the first wavelength converting member.
  • the first and second wavelength converting member may comprise wavelength converting domains with different wavelength converting properties. Such properties may be size, thickness, shape, pitch, distribution or content of wavelength converting material(s) and/or number of layers of wavelength converting material. There may further be a different number of wavelength converting domains on the first light exit window compared to the second light exit window.
  • the second wavelength converting member may further comprise two or more wavelength converting domains with different wavelength converting properties.
  • the wavelength converting member on the first light exit window and the second wavelength converting member on the second light exit window are arranged in-phase or out-of-phase with each other.
  • the light output from the first and the second light exit windows may be designed in a desired way by arranging the first wavelength converting member and the second wavelength converting member in-phase or out-of-phase.
  • the wavelength converting member may comprise a wavelength converting layer arranged on the inner surface of the first light exit window.
  • the wavelength converting layer may be provided at the inner surface of the first light exit window to convert the wavelength of light passing through the layer and the first light exit window.
  • the wavelength converting layer may be provided on a part of the inner surface of the first light exit window, or covering the entire inner surface of the first light exit window.
  • the light output through the first light exit window may thereby be only light that have passed through the wavelength converting layer, i.e. light with a converted wavelength.
  • the light output through the second light exit window may substantially be non- converted light from the light source. A part of the light that have passed through the wavelength converting layer may be reflected back into the mixing chamber and eventually pass through the second light exit window.
  • the light output through the second light exit window may thereby be a mixture of non-converted light and converted light.
  • the wavelength converting layer may be a luminescent foil.
  • the wavelength converting layer may comprise at least one opening which comprises a reflective member.
  • Such reflective members may be provided to control the amount of light, light color and/or color temperature that passes through the first and the second light exit windows.
  • the wavelength converting layer may comprise a first wavelength converting material, and the wavelength converting member further comprises at least one wavelength converting domain comprising a second wavelength converting material arranged on said inner surface of the first light exit window.
  • the wavelength converting domains may be provided on the wavelength converting layer, or on the inner surface of the first light exit window, at openings in the wavelength converting layer.
  • the light output through the first light exit window may be light that has passed through the wavelength converting layer, i.e. light of a converted wavelength.
  • the light output through the second light exit window may be a mixture of non- converted light from the light source and light converted by the at least one wavelength converting domain, comprising the second wavelength converting material.
  • Light converted by the wavelength converting layer and light converted by the wavelength converting domains may have different wavelength.
  • Each wavelength converting domain may be arranged on a reflective member. The reflective member may reflect light converted by the domains comprising the second wavelength converting material back into the mixing chamber and directed towards the second light exit window.
  • the wavelength converting layer may comprise an electrically switchable wavelength converting layer.
  • a switchable wavelength converting layer may be a layer which may change wavelength converting properties when an electric voltage is applied to the layer. Light passing through the switchable wavelength converting layer may come out with different wavelength depending on the applied voltage. That is, different colors or color temperatures may be achieved depending on the applied voltage.
  • Such switchable wavelength converting layer may for instance be a Polymer Dispersed Liquid Crystal (PDLC) element comprising a luminescent material or a Liquid Crystal gel (LC-gel) comprising a luminescent material, an electro-wetting device comprising a luminescent material or an in-plane switching electro- phoretic device comprising a luminescent material.
  • PDLC Polymer Dispersed Liquid Crystal
  • LC-gel Liquid Crystal gel
  • the surrounding wall may comprise four side walls, wherein light sources are arranged on at least two of the four side walls.
  • the light sources may be arranged on two oppositely arranged side walls.
  • the light sources may thereby provide a homogeneous light distribution in the optical mixing chamber.
  • a plurality of light sources may be arranged in a matrix arrangement on the at least one surrounding wall.
  • the light sources on the surrounding wall may be arranged in a matrix arrangement, or in a linear array. Such arrangement may provide a homogeneous light distribution within the optical mixing chamber.
  • the light sources may be provided on a carrier on the surrounding wall.
  • the surrounding wall may comprise a plurality of side walls, and the light sources may be arranged on at least two of the side walls.
  • the light sources may be arranged in similar or different matrix or array arrangements on the different side walls.
  • a luminaire adapted to emit light of a first color or color temperature in a first direction (e.g. up), and light of a second color or color temperature in a second direction (e.g. down), wherein the luminaire comprises an optical arrangement as presented above.
  • Fig. la is a perspective view of an optical arrangement according to an embodiment of the present invention.
  • Fig. lb is a perspective view of an optical arrangement according to an embodiment of the present invention.
  • Fig. lc is a perspective view of a luminaire according to an embodiment of the present invention.
  • Fig. 2 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 3 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 4 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 5 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 6 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 7 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention
  • Fig. 8 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention
  • Fig. 9 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 10 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 11 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 12 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 13 is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 14a is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 14b is a cross-sectional side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 15a is a partial side view of an optical arrangement according to an embodiment of the present invention.
  • Fig. 15b is a partial side view of an optical arrangement according to an embodiment of the present invention.
  • Figs, la and lb illustrate an optical arrangement 1 which comprises a first light exit window 14 and a second light exit window 16.
  • the two light exit windows 14, 16 are oppositely arranged to provide light in two opposite directions.
  • a first light A exits through the first light exit window 14 and a second light B exits through the second light exit window 16.
  • the optical arrangement 1 is adapted to provide the light A and light B of different colors or different color temperatures. Such effect may be used in e.g. an office to provide a comfortable light in a room.
  • Fig. lc illustrates a luminaire 100 comprising an optical arrangement 1.
  • Such luminaire 100 may be arranged in an office or home to provide a desired lighting
  • the optical arrangment is arranged on a stand.
  • the luminaire may be arranged on a wall or hanging from a roof.
  • the luminaire 100 is typically arranged such that light A in a first direction is directed upwards (e.g.
  • light B in an opposite second direction is directed downwards (e.g.
  • Fig. 2 illustrates the inside of the optical arrangement 1.
  • the optical arrangement 1 comprises side walls 12.
  • the optical arrangement 1 is here illustrated as a box shaped arrangement comprising four side walls 12 (see fig. 1).
  • the side walls 12 together with the first light exit window 14 and the second light exit window 16 define an optical mixing chamber 10.
  • On one of the side walls 12 a light source 20 is arranged.
  • the light source 20 emits light C of a first wavelength.
  • the light source 20 emits light towards both light exit windows 14, 16.
  • a portion CI of the light will exit through the second light exit window 16.
  • Another portion C2 of the light will be reflected back into the optical mixing chamber 10 and towards the first light exit window 14 and exit through the same.
  • the light C from the light source 20 will further reach one or more wavelength converting members 30 arranged on an inner surface 15 of the first light exit window 14.
  • the wavelength converting member 30 comprises a plurality of wavelength converting domains 30a-f, each arranged on a reflective member 40. Each wavelength converting domain 30a-f of the wavelength converting member 30 further comprises a wavelength converting material.
  • Light C from the light source 20 that reaches the wavelength converting member 30 will at least partly be converted to wavelength converted light D.
  • the incoming light C to the wavelength converting member 30 will further be reflected back into the optical mixing chamber 10 by a reflective member 40 towards the second light exit window 16.
  • the wavelength converted light D will exit through the second light exit window 16 together with non-converted light CI from the light source 20.
  • the light D converted by the wavelength converting member 30 may be of a different color or different color temperature compared to the light C from the light source 20.
  • the light exiting through the second light exit window 16 is thereby of a different color or color temperature than the light exiting through the first light exit window 14.
  • the light exit windows 14, 16 are preferably translucent layers.
  • An example of a translucent layer is a diffuser e.g. a layer with a scatterer such as Ti0 2 or A1 2 0 3 particles.
  • the type of translucent layer depends on the remote phosphor configuration to be used.
  • the desired amount of back reflection of the light exit window 14, 16 also depends on the remote phosphor configuration and application of the optical arrangement 1.
  • the amount of back reflection is preferably in the range of 1-50%, more preferably in the range of 1-30%, most preferably in the range of 1-20%.
  • organic materials suitable for use as the wavelength converting material include luminescent materials based on perylene derivatives, which are for instance sold under the brand name Lumogen® by BASF.
  • suitable commercially available products thus include, but are not limited to, Lumogen ® Red F305, Lumogen ® Orange F240, Lumogen ® Yellow F170, and combinations thereof.
  • a wavelength converting domain may comprise scattering elements, e.g. particles of A1 2 0 3 or Ti0 2 .
  • inorganic phosphors suitable for the wavelength converting material include, but are not limited to, cerium doped yttrium aluminum garnet
  • Y 3 Al 5 0i 2 :Ce 3+ also referred to as YAG:Ce or Ce doped YAG
  • lutetium aluminum garnet LiAG, Lu 3 Al 5 0i 2
  • a-SiA10N:Eu 2+ yellow
  • M 2 Si 5 N 8 :Eu 2+ red
  • M is at least one element selected from calcium Ca, Sr and Ba.
  • a part of the aluminum may be substituted with gadolinium (Gd) or gallium (Ga), wherein more Gd results in a red shift of the yellow emission.
  • Other suitable materials may include (Sri_ x _ y B a _ x C a _ y ) 2 _ z Si 5 - a Al a N 8 - a O a :Eu z 2+ wherein 0 ⁇ a ⁇ 5, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1 and 0 ⁇ z ⁇ 1, and (x+y) ⁇ 1, such as Sr 2 Si 5 N 8 :Eu 2+ which emits light in the red range.
  • the wavelength converting material may comprise quantum dots.
  • 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 shell such as cadmium sulfide (CdS) and zinc sulfide (ZnS).
  • Cadmium free quantum dots such as indium phosphode (InP), and copper indium sulfide (CuInS 2 ) and/or silver indium sulfide (AgInS 2 ) 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, provided that it has the appropriate wavelength conversion characteristics. However, it may be preferred for reasons of environmental safety and concern to use cadmium- free quantum dots or at least quantum dots having very low cadmium content.
  • Fig. 3 illustrates an embodiment wherein the wavelength converting member 30 comprises wavelength converting domains 31a-f of different sizes.
  • the sizes of each wavelength converting domain 3 la-f are adapted with regard to the location of the domain in relation to the light source 20.
  • a wavelength converting domain 3 If with a longer distance to the light source 20 is larger in size than a wavelength converting domain 31a closer to the light source 20.
  • the sizes of the wavelength converting domains 3 la-f are selected to provide a homogeneous light output through the second light exit window 16.
  • Fig. 4 illustrates an embodiment wherein the wavelength converting member 30 comprises wavelength converting domains 30a-f with different pitch.
  • the pitch between the wavelength converting domains 30a-f is adapted with regard to the location of each domain in relation to the light source 20.
  • a domain 3 Of with a longer distance to the light source 20 has a smaller distance to the closest other domain than a domain 30a closer to the light source 20.
  • the pitches between the wavelength converting domains 30a-f are selected to provide a homogeneous light output through the second light exit window 16.
  • the wavelength converting member 30 comprises a wavelength converting material which provides a wavelength converting effect.
  • Fig. 5 illustrates an embodiment wherein the wavelength converting member 30 comprises wavelength converting domains 32a-f with different wavelength converting materials. The selection of wavelength converting material in the wavelength converting domains 32a-f depends on each domain's distance to the light source 20. The wavelength converting material content of each wavelength converting domain 32a-f is selected to provide a desired light output through the second light exit window 16.
  • Fig. 6 illustrates an embodiment wherein the wavelength converting member 30 comprises wavelength converting domains 33a-f of different thicknesses.
  • the thicknesses of each wavelength converting domain 33a-f are adapted with regard to the location of the domain in relation to the light source 20.
  • a wavelength converting domain 33f with a longer distance to the light source 20 has a smaller thickness than a wavelength converting domain 33a closer to the light source 20.
  • the thicknesses of the wavelength converting domains 33a- f are selected to provide a homogeneous light output through the second light exit window 16.
  • the reflective member 40 on which the wavelength converting member 30 is arranged may in one embodiment be of a larger size than the wavelength converting member 30.
  • Fig. 7 illustrates an embodiment wherein the wavelength converting member 30 comprises wavelength converting domains 30a-f arranged on reflective domains 42a-f of different size. With a reflective domain 42a-f larger than the respective wavelength converting domain 30a- f, a part of the light from the light source will be reflected by the reflective domain 42a-f back into the optical mixing chamber 10 without being converted by the wavelength converting domain 30a- f.
  • the size of the reflective domain 42a-f in relation to the respective wavelength converting domain 30a-f is adapted with regard to the location of the domain in relation to the light source 20.
  • a reflective member 42f with a longer distance to the light source 20 is larger than a reflective member 42a closer to the light source 20.
  • Fig. 8 illustrates an embodiment wherein the wavelength converting member
  • each wavelength converting domain 34a-f comprises two wavelength converting layers 51, 52.
  • Each wavelength converting layer 51, 52 comprises different wavelength converting material.
  • the different wavelength converting materials provides converted light of different wavelength.
  • each wavelength converting domain 34a-f has a different combination of wavelength converting material in the two wavelength converting layers 51, 52.
  • Fig. 9 illustrates an embodiment wherein the wavelength converting member 30 comprises a wavelength converting layer 35 comprising a wavelength converting material.
  • the wavelength converting layer 35 may be provided as a luminescent foil on the inner surface of the first light exit window 14.
  • the wavelength converting layer 35 provides that all light C from the light source 20 that exits through the first light exit window 14 is light E of a converted wavelength.
  • the wavelength converting layer 35 is further provided with openings in which reflective members 40 are provided.
  • the reflective members 40 provide that, in addition to light from the light source 20 that directly reaches the second light exit window 16 (as seen in fig. 2), light C from the light source 20 that reaches a reflective member 40 is reflected as light C3 back into the optical mixing chamber 10 towards the second light exit window 16, and further exits through the second light exit window 16 as light C4.
  • the reflective members 40 may instead be arranged on top of the wavelength converting layer 35.
  • the wavelength converting layer 35 comprises a first wavelength converting material.
  • a plurality of wavelength converting domains 36a-f are arranged, each on top of a reflective member 40.
  • Each wavelength converting domain 36a-f comprises a second wavelength converting material, different from the first wavelength converting material.
  • Part of the light C from the light source 20 will thereby, in addition to a part being converted by the wavelength converting layer 35 as described with fig. 9, be converted by the wavelength converting domains 36a-f and reflected by the reflective member 40 towards the second light exit window 16 as light F.
  • the optical arrangement 1 may comprise, instead of the wavelength converting domains on top of the wavelength converting layer 35, a second wavelength converting layer on the inner surface 17 of the second light exit window 16.
  • the second wavelength converting layer may comprise a wavelength converting material different from the wavelength converting material of the wavelength converting layer 35. Light exiting the second light exit window 16 may thereby be converted to another wavelength than the light exiting the first light exit window 14.
  • Figs. 11 and 12 illustrate an embodiment wherein additional reflective members 43 are provided on an inner surface 17 of the second light exit window 16. Such arrangement further separates the output light through the two light exit windows 14, 16 since a larger amount of the non-converted light C, C5 from the light source 20 will exit through the first light exit window 14. Correspondingly, a larger amount of the light exiting through the second light exit window 16 will be converted light D.
  • the additional reflective members 43 on the second light exit window 16 can be arranged out-of-phase with the wavelength converting domains 30a-f on the first light exit window 14, as illustrated in fig. 11. Alternatively, the additional reflective member 43 can be arranged in-phase with the wavelength converting domains 30a-f, as illustrated in fig. 12.
  • Fig. 13 illustrates an embodiment wherein the optical arrangement 1 further comprises a second wavelength converting member 70 arranged on the inner surface 17 of the second light exit window 16.
  • the second wavelength converting member 70 comprises a plurality of wavelength converting domains 70a-h each comprising a wavelength converting material which is different from the wavelength converting material of the wavelength converting member 30 arranged on the first light exit window 14.
  • Light C from the light source 20 reaching the second wavelength converting member 70 is converted to light G and reflected by the reflective member 43 to exit through the first light exit window 14, whilst the light C reaching the wavelength converting member 30 on the first light exit window 14 is converted to light D and reflected by the reflective member 40 to exit through the second light exit window 16.
  • the wavelength converting domains 70a-h of the second wavelength converting member 70 can be arranged in-phase or out-of-phase with the wavelength converting domains 30a-f.
  • Fig. 14a and b illustrates an embodiment of the optical arrangement 1 wherein the wavelength converting member 30 comprises an electrically switchable wavelength converting layer 37.
  • the electrically switchable wavelength converting layer 37 is connected to a power source U adapted to apply a voltage onto the layer 37.
  • the electrically switchable wavelength converting layer 37 In a first state, when no power is applied by the power source U, the electrically switchable wavelength converting layer 37 has a first wavelength converting property, providing conversion of light C from the light source 20 into a light H.
  • the electrically switchable wavelength converting layer 37 has a second wavelength converting property, providing conversion of light C from the light source 20 into a light I.
  • the wavelength of light converted by the wavelength converting layer 37 can be controlled by the applied voltage.
  • the wavelength converting member 30 may further comprise a plurality of wavelength converting domains 36a-f, arranged on the wavelength converting layer 37, and comprising a wavelength converting material different from the wavelength converting material in the wavelength converting layer 37, and adapted to convert and reflect light to exit through the second light exit window 16.
  • the switchable wavelength converting layer 37 can be a switchable luminescent layer, for instance a Polymer Dispersed Liquid Crystal (PDLC) element comprising a luminescent material or Liquid Crystal gel (LC-gel) comprising a luminescent material, electrowetting device comprising a luminescent material or in-plane switching electrophoretic device comprising a luminescent material.
  • PDLC Polymer Dispersed Liquid Crystal
  • LC-gel Liquid Crystal gel
  • electrowetting device comprising a luminescent material or in-plane switching electrophoretic device comprising a luminescent material.
  • Fig. 15a illustrates an embodiment of a side wall 12 of the optical arrangement 1.
  • a plurality of light sources 20 are arranged in a matrix pattern.
  • the light sources 20 may be arranged in a linear array on the side wall 12.
  • the light sources 20 may be arranged on one or several of the side walls 12 in an optical arrangement 1.
  • the light sources 20 may be arranged in similar or different patterns on the different side walls 12. If light sources 20 are arranged on two side walls 12, these side walls should preferably be oppositely arranged side walls 12.
  • the light source 20 used in the optical arrangement 1 may be any suitable solid state light source used for backlighting and which is adapted to emit light of a specified wavelength range.
  • the light source 20 may be an LED, preferably an inorganic LED, or a laser diode.
  • the light source 20 may be an organic light emitting diode (OLED).
  • the first wavelength range emitted by the light source is blue light e.g. light having a wavelength in the range of from 440 to 460 nm, and the light source may thus be a blue LED.
  • the first wavelength range emitted by the light source 20 is light with a high correlated color temperature, and the light source may thus be a direct phosphor converted LED i.e. a UV, violet or blue LED with a thin layer of phosphor applied thereon. For instance, light having a correlated color temperature of
  • the light sources 20 on a side wall 12 may be arranged on a carrier.
  • LEDs placed onto opposite surfaces of the light exit windows 14, 16 with or without extra wavelength conversion can also lead to different colors and/or color temperatures exiting these surfaces.
  • the wavelength converting material of the wavelength converting member may further be selected from additional examples of materials, and the structural design of the optical arrangement may vary.

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  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optical Filters (AREA)

Abstract

La présente invention concerne un agencement optique (1), comprenant une chambre de mélange optique (10) délimitée par au moins une paroi périphérique (12), une première fenêtre de sortie de lumière (14) et une seconde fenêtre de sortie de lumière (16) agencée face à ladite première fenêtre de sortie de lumière (14). La ou les sources de lumière à semi-conducteurs (20) sont conçues pour émettre une lumière primaire et sont agencées sur ladite paroi périphérique (14). L'agencement optique (1) comprend en outre au moins un élément de conversion de longueur d'onde (30) agencé sur une surface interne (15) de la première fenêtre de sortie de lumière (14) et conçu pour convertir la longueur d'onde d'au moins une partie de la lumière primaire. L'agencement optique (1) comprend en outre un élément réfléchissant (40) agencé sur ladite surface interne (15) de ladite première fenêtre de sortie de lumière (14). L'élément réfléchissant (40) est conçu pour permettre à ladite lumière primaire et/ou à ladite lumière de longueur d'onde convertie de passer à travers ladite première fenêtre de sortie de lumière (14).
PCT/IB2013/052540 2012-04-05 2013-03-29 Agencement optique pour éclairage ascendant et descendant WO2013150429A1 (fr)

Applications Claiming Priority (2)

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US201261620510P 2012-04-05 2012-04-05
US61/620,510 2012-04-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015104164A1 (fr) * 2014-01-07 2015-07-16 Koninklijke Philips N.V. Système d'éclairage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070273265A1 (en) * 2004-04-15 2007-11-29 Koninklijke Philips Electronics, N.V. Electrically Controllable Color Conversion Cell
WO2009087587A1 (fr) * 2008-01-08 2009-07-16 Koninklijke Philips Electronics N.V. Système d'éclairage
WO2009087586A1 (fr) * 2008-01-08 2009-07-16 Koninklijke Philips Electronics N.V. Dispositif de sortie lumineuse à particules fluorescentes ou réfléchissantes
US20100220497A1 (en) * 2009-01-14 2010-09-02 Ngai Peter Y Y Luminaire having floating luminous light source
WO2012001564A1 (fr) * 2010-06-30 2012-01-05 Koninklijke Philips Electronics N.V. Appareil d'éclairage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070273265A1 (en) * 2004-04-15 2007-11-29 Koninklijke Philips Electronics, N.V. Electrically Controllable Color Conversion Cell
WO2009087587A1 (fr) * 2008-01-08 2009-07-16 Koninklijke Philips Electronics N.V. Système d'éclairage
WO2009087586A1 (fr) * 2008-01-08 2009-07-16 Koninklijke Philips Electronics N.V. Dispositif de sortie lumineuse à particules fluorescentes ou réfléchissantes
US20100220497A1 (en) * 2009-01-14 2010-09-02 Ngai Peter Y Y Luminaire having floating luminous light source
WO2012001564A1 (fr) * 2010-06-30 2012-01-05 Koninklijke Philips Electronics N.V. Appareil d'éclairage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015104164A1 (fr) * 2014-01-07 2015-07-16 Koninklijke Philips N.V. Système d'éclairage
US9822950B2 (en) 2014-01-07 2017-11-21 Philips Lighting Holding B.V. Lighting system

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