EP2986906A1 - Dispositif lumineux servant à générer de la lumière blanche - Google Patents
Dispositif lumineux servant à générer de la lumière blancheInfo
- Publication number
- EP2986906A1 EP2986906A1 EP14720052.1A EP14720052A EP2986906A1 EP 2986906 A1 EP2986906 A1 EP 2986906A1 EP 14720052 A EP14720052 A EP 14720052A EP 2986906 A1 EP2986906 A1 EP 2986906A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- conversion
- lighting device
- conversion elements
- excitation light
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 211
- 230000005284 excitation Effects 0.000 claims abstract description 60
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000002096 quantum dot Substances 0.000 claims description 10
- 239000012815 thermoplastic material Substances 0.000 claims description 5
- 229920006352 transparent thermoplastic Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 230000003993 interaction Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 17
- 230000003595 spectral effect Effects 0.000 description 9
- 239000007850 fluorescent dye Substances 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
-
- 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
- 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
- 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
- F21V9/38—Combination of two or more photoluminescent elements of different materials
-
- 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]
-
- 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]
- F21Y2115/15—Organic light-emitting diodes [OLED]
-
- 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
- F21Y2115/30—Semiconductor lasers
Definitions
- the present invention relates to a lighting device and a method for producing mixed light, preferably for generating white light.
- the present invention proposes to convert the light of an excitation light source into at least two conversion elements arranged one behind the other in the beam direction of the excitation light source and spaced from each other and to combine the excitation light with the converted light.
- the prior art discloses a lighting device with a blue-emitting light-emitting diode (LED) as the light source, in which a white light is produced by partial color conversion of the blue light.
- a white light is produced by partial color conversion of the blue light.
- part of the blue light of the LED is converted by a color conversion layer which is either directly applied to the LED or arranged as a so-called "remote phosphor" layer at a distance from the LED Color conversion layer generated light appears to a viewer of the lighting device as a whole white light.
- various fluorescent dyes are usually used as the conversion agent, which are excited by the blue light of the LED and then each emit light of a different wavelength.
- the disadvantage here is that these conversion means have overlaps of their absorption and emission spectra to each other in part.
- light emitted by one fluorescent dye is also absorbed by another fluorescent dye which emits in the longer wavelength range.
- This circumstance has the consequence that larger quantities of the fluorescent dyes than would actually be required for the desired white light generation must be used. In addition, this also makes it difficult to model the color conversion layer.
- the present invention has an object to improve the above-mentioned prior art.
- it is an object of the present invention to provide a Minimize interaction between different conversion means in a lighting device.
- a further object of the present invention is to reduce the amount of the conversion agent used and, if possible, to consume only the quantities necessary for the desired light generation.
- a further object of the present invention is to provide a luminous means whose light output, in particular its color impression, is more homogeneous.
- the present invention relates to a lighting device for generating mixed light, preferably white light, comprising: a light source for emitting excitation light of a certain wavelength, at least two conversion elements, which are arranged one behind the other in the propagation direction of the excitation light, wherein a first conversion element thereto is configured to convert the wavelength of a portion of the excitation light, a second conversion element is adapted to convert the wavelength of a portion of the excitation light not converted by the first conversion element, and the first conversion element and the second conversion element by a first distance are separated from each other.
- the lighting device emits a total of light composed of at least the wavelength of the excitation light, the wavelength of the first converted light, and the wavelength of the second converted light.
- the excitation light may be from the ultraviolet or blue spectral range and mixed with light from the yellow and / or green spectral range converted in the conversion elements to produce the white light of the light emitting device.
- the light source and / or the conversion elements can also generate light from other spectral ranges, depending on the desired mixed light of the lighting device.
- the distance between the conversion elements has the consequence that a large part of the wavelength-converted light in a conversion element is totally reflected at the light exit surface or the light entry surface of the unconverted excitation light.
- the reason for this is that the light converted to a different wavelength has, compared to the remainder of the excitation light, for the most part an altered emission direction and therefore for the most part falls at different angles than the excitation light to, for example, the light exit surface, these angles being subject to total reflection.
- the distance between the conversion elements is preferably filled with a material or a medium which has a lower refractive index than the material of the conversion elements, that is to say a visually less dense medium than the conversion elements. Due to the change in the direction of propagation of the converted light, it is output from the conversion element elsewhere, specifically in such a way that it does not enter the subsequent conversion element.
- the unconverted light largely retains its direction of propagation and therefore will not be totally reflected at the light exit surface of a conversion element, at least for the most part, and may enter the subsequent conversion element.
- an interaction between the various conversion elements can be minimized, since mainly unconverted light is transmitted from one conversion element to the next. Consequently, the conversion means responsible for the wavelength conversion in the conversion elements need only be used in amounts required for the desired mixed light. The material consumption is thus reduced. It also simplifies modeling the individual conversion elements. The resulting mixed light of the lighting device can therefore be predicted more precisely.
- the distance and the thickness of the conversion elements in the direction of propagation are preferably chosen so that the viewer is given a homogeneous impression of the light color or the light color temperature of the mixed light. A small distance between the conversion elements already suffices to achieve the total reflection of the wavelength-converted light.
- the conversion elements have predefined and planar light entry and exit surfaces for the excitation light, so that the total reflection of the in the Conversion elements generated wavelength-converted light is more predictable.
- a third conversion element is configured to convert the wavelength of a portion of the excitation light not converted by the second conversion element, and the second conversion element and the third conversion element are separated by a second distance.
- the three conversion elements can emit light from the yellow, green and red spectral range. Together with, for example, blue light from the LED, the natural-looking white light can be mixed.
- two adjacent conversion elements are separated by an air gap.
- a material having a higher refractive index than air in the air gaps is selected as the material of the conversion elements.
- the air between the conversion elements is a visually less dense medium than the conversion elements themselves.
- the air gap makes it possible to produce the total reflection of the generated light described above.
- the material consumption for an arrangement with air gaps is minimal.
- a filling material between two adjacent conversion elements having a lower refractive index than the refractive index of the two conversion elements may be provided in order to increase the stability of the arrangement.
- the filling material may be formed, for example, as an optical plate, a disk, a layer, a film or the like.
- each of the conversion elements is adapted to convert the wavelength of the excitation light into a different wavelength, preferably a different color, than the other conversion elements.
- a different wavelength preferably from different colored areas of the light spectrum, for example, a natural-looking white light can be generated.
- each of the conversion elements is designed as a disk with two opposite flat sides and a lateral surface, and the conversion elements are designed and arranged such that unconverted excitation light passes successively over the flat sides through all the conversion elements.
- the flat sides serve as the light entrance and light exit surface for the excitation light. Due to the change of direction, light generated in the conversion elements is largely totally reflected on the flat sides, since it undergoes a change in direction during the conversion.
- the flat sides of the conversion elements are at least approximately aligned parallel to each other.
- the excitation light or the light not converted in the conversion elements can, at least for the most part, pass through the successive conversion elements without total reflection.
- each of the conversion elements is designed such that excitation light converted therefrom exits almost completely over the lateral surfaces.
- the converted light can largely escape in the radial direction over the lateral surface. As a result, this converted light is deflected in such a way that it does not enter the subsequent conversion element. Thus, an interaction between the conversion elements is minimized.
- each of the conversion elements is designed as a semicircular disc having an end face which is provided with a mirror layer. Light is mirrored at the mirror layer, so that the light is directed and exits only on one side of the conversion elements on the semi-circular lateral surfaces.
- a light source can serve well, for example as a neon tube replacement.
- each of the conversion elements has at least one other conversion means than the other conversion elements.
- each conversion means As a result, differently converted light, i.e., light, is converted in each conversion means. generates a different wavelength of light.
- each conversion element Preferably, each conversion element generates light of a different color or color temperature.
- each of the conversion elements is formed of a transparent thermoplastic material, preferably PMMA, and the conversion agent is embedded in the transparent thermoplastic material.
- the conversion agents are each phosphor and / or quantum dots.
- Fluorescent substances such as, for example, fluorescent dyes or phosphorus
- the phosphor can be scattered, for example, present as a powder, particles or clusters in the material of the conversion elements.
- Each conversion element can also be provided with an inner or outer layer. It is also possible for each conversion element to have a film on both sides, which is preferably coated on its inner side with a conversion layer containing at least one distributed phosphor. Excitation light that strikes phosphor particles is wavelength converted and scattered so that it strikes mostly at angles to the flat sides of the conversion element that favor total reflection.
- the first distance and the second distance are equal.
- the distances can also be adapted to the wavelengths of the excitation light and / or the converted light.
- the first distance and the second distance are in a range of 1 to 10 mm.
- a distance can be selected that is equal to or just greater than the wavelength of the light generated in the conversion element. Since light with different wavelengths is preferably generated in the conversion elements, the first distance and the second distance may be different as described above, for example, as large as the respectively generated wavelengths or slightly larger.
- the lighting device further comprises means for combining the unconverted excitation light and the light converted by the conversion elements to produce the mixed light, preferably white light.
- scattering agents such as a diffusing layer can be used to obtain a homogeneous impression of the mixed light emitted by the lighting device.
- optical elements such as lenses, collimators or the like can be used.
- the present invention further relates to a method for producing mixed light, preferably white light, comprising the steps of: generating excitation light of a certain wavelength, converting the wavelength of a part of the excitation light by a first conversion element, and converting the wavelength of a part of the non-converted by the first conversion element excitation light through a second conversion element, wherein the conversion elements are arranged one behind the other in the propagation direction of the excitation light and separated by a first distance.
- Figure 1 shows a first embodiment of a lighting device of the present invention.
- FIG. 2 shows a second embodiment of a lighting device of the present invention.
- a lighting device 1 of the present invention according to a first embodiment is shown.
- the lighting device 1 is designed to generate mixed light such as white light.
- the lighting device 1 has a light source 2 for generating and emitting excitation light of a specific wavelength ⁇ 2 .
- the light source 2 used in the lighting device 1 may be, for example, an LED, an organic LED (OLED), a laser, an LED track, or the like.
- the light source 2 in a lighting device for generating white light is capable of emitting light from the blue or ultraviolet spectral range.
- the excitation light from the light source 2 is generally converted into secondarily generated light of different wavelengths, preferably different colors.
- the excitation light is then combined with the secondarily generated light such that the lighting device 1 emits a mixed light, preferably a white light, a desired color or color temperature.
- the lighting device 1 For generating the secondary light, the lighting device 1 at least two conversion elements 3, 4, which are arranged one behind the other in the propagation direction 6 of the excitation light.
- the excitation light from the light source 2 can be aligned, for example by suitable optical elements, with the conversion elements 3, 4, 5 such that it impinges on light entry surfaces of the conversion elements 3, 4, 5 only at a predetermined angle.
- Each of the conversion elements 3, 4, 5 is suitable for converting the wavelength ⁇ 2 of the light from the light source 2 into light, preferably of a different wavelength ⁇ 3 , ⁇ 4 , ⁇ 5 .
- the wavelengths are from the yellow, green and red spectral range.
- conversion means in the conversion elements 3, 4, 5 are excited by a part of the excitation light and then emit secondary light themselves.
- a first conversion element 3 converts a part of the excitation light from the light source 2 in light of a wavelength ⁇ 3 um.
- An unconverted part of the excitation light from the light source 2 for the most part leaves the first conversion element 3 without changing direction and enters the subsequent second conversion element 4.
- the second conversion element 4 then converts part of the incoming light of the wavelength ⁇ 2 into light of a wavelength ⁇ 4 . Again, an unconverted part of the light is largely supplied to a third conversion element 5 without changing direction. This supplied light of wavelength ⁇ 2 is partially converted into light of a wavelength ⁇ 5 in the third conversion element 5 . From the third color conversion element 5, finally, a part of the excitation light emerges, which was not influenced in any of the three conversion elements 3, 4, 5 and therefore has the wavelength ⁇ 2 of the excitation light emitted by the light source 2.
- the described concept is also possible with more than three conversion elements. It can also be arranged on each side of the arrangement of the conversion elements 3, 4, 5, a light source 2, as indicated in Fig. 1, so that excitation light in opposite directions through the conversion elements 3, 4, 5 is irradiated. Thereby, the brightness of the lighting device 1 can be increased.
- a total of light of different wavelengths ⁇ 2 , ⁇ 3 , and ⁇ 5 is generated.
- These different wavelengths ⁇ 2 , ⁇ , ⁇ 4 and ⁇ 5 are combined by suitable means to emerge as a mixed light, preferably white light, from the lighting device 1.
- Said means may be optical elements such as apertures, lenses, scattering agents or the like. It can also enclose only one luminous element of the lighting device 1, the arrangement shown in Fig. 1, and scatter the various light components so that from the outside a homogeneous mixed light can be seen.
- the individual conversion elements 3, 4, 5 are anyway made so thin and arranged so close to one another that the viewer is given a homogeneous color impression of the mixed light produced overall.
- the first conversion element 3 and the second conversion element 4 are separated from each other by a first distance 7.
- the second conversion element 4 and the third conversion element 5 are separated from one another by a second distance 8.
- the distances 7 and 8 can be the same size or could be different.
- the first distance 7 and the second distance 8 can correspond approximately to the wavelength ⁇ 3 of the light generated in the first conversion element 3 or the wavelength of the light generated in the second conversion element 4 in order to build the most compact possible arrangement.
- the distances 7, 8 are preferably both in a size range of 0.5 to 20 mm, more preferably 0.5 to 10 mm, even more preferably 1 to 5 mm. Between two adjacent of the individual conversion elements 3, 4, 5, only air can be located.
- the conversion elements 3 and 4 and the conversion elements 4 and 5 are separated from each other by an air gap.
- a material to be arranged between the aforementioned adjacent conversion elements 3, 4, 5, which has a smaller refractive index than the material of the conversion elements 3, 4, 5.
- the refractive indices are preferably chosen so that converted light generated within a conversion means 3, 4, 5 experiences a total reflection at the interface of conversion element 3, 4, 5 to air gap or material with a smaller refractive index between the conversion elements.
- the conversion elements 3, 4, 5 may, for example, be glued together by a layer with a lower refractive index.
- Two conversion elements 3, 4, 5 may also be a film, a plate, a disc or the like made of a material having a lower refractive index than the material of the conversion elements 3, 4, 5, thereby the entire arrangement of the conversion element 3, 4, 5 additional stability can be awarded or the conversion elements can be protected.
- the conversion elements 3, 4, 5 may be, for example, as shown in Fig. 1 slices or plates and each two flat sides 3b, 4b, 5b and a lateral surface 3a, 4a, 5a include.
- the cross-section of the conversion elements 3, 4, 5 may be circular or oval, as shown in Fig. 1.
- Excitation light from the light source 2 strikes light device 1 initially on the light source 2 facing flat side 3b of the first conversion element 3 and enters this.
- the light converted in the conversion element 3, in addition to the wavelength conversion by the conversion means, for the most part also experiences a scattering or a change of direction. Therefore, this converted light then undergoes a total reflection at the two flat sides 3b and is therefore largely discharged in the radial direction over the lateral surface 3a.
- the unconverted light but is emitted through the side facing away from the light source 2 flat side 3b, since it does not interact with the conversion means and therefore largely no change in direction undergoes, and then enters through the light source 2 facing flat side 4b of the second conversion element 4 in this.
- the light converted in the second conversion element 4 experiences exactly as described above a total reflection on the flat sides 4b of the second conversion element 4 and therefore occurs predominantly in the radial direction of the conversion element 4 over the lateral surface 4a.
- the unconverted light emerges from the flat side 4b facing away from the light source 2, and enters the flat side 5b of the third conversion element 5 facing the light source 2. Also in the third conversion element 5, the light converted therein is totally reflected on the flat sides 5b and largely released radially over the lateral surface 5a.
- the respective conversion elements 3, 4, 5 at least a small distance 7, 8 to each other, so there is a decoupling of the corresponding conversion elements 3, 4, 5 instead. Since, due to this decoupling, the light of the wavelengths ⁇ 3 , ⁇ 4 and ⁇ 5 is emitted predominantly via the lateral surfaces 3 a, 4 a, 5 a, there is hardly any interaction between the different conversion means 3, 4, 5. In addition, the mixture of light is extremely homogeneous, since the conversion elements 3, 4, 5 can be arranged close to each other. In particular, if the conversion elements 3, 4, 5 are designed as thin slices, platelets or films, for example with a thickness which is about 1 to 10 mm, preferably 3 to 5 mm, the viewer is given a very homogeneous color impression.
- each conversion element 3, 4, 5 is provided with at least one conversion means.
- at least one conversion agent in each conversion element 3, 4, 5 is present, which is not included in the other conversion means.
- the conversion means of the various conversion elements 3, 4, 5 light of different wavelength ⁇ 3 , ⁇ 4 and ⁇ 5 generate. This light is preferably made of different colored spectral regions of the spectrum.
- Each conversion means 3, 4, 5 thus preferably produces light of a different color.
- the Wavelengths ⁇ 3 , ⁇ 4 ⁇ 5 from the yellow, green and red spectral range.
- two or more of the wavelengths ⁇ 3 , ⁇ 5 to be from the same spectral range.
- the conversion agents may be one or more phosphors, such as a phosphor or fluorescent dyes, or may be formed as quantum dots.
- a phosphor can be organic or inorganic.
- the phosphor is preferably distributed, for example, in powder form, particle form or cluster form in a conversion element 3, 4, 5.
- the at least one phosphor is embedded in the material of the conversion element 3, 4, 5.
- the material of the conversion elements 3, 4, 5 may be a transparent thermoplastic material, such.
- Quantum dots are preferably embedded as at least one layer in the conversion elements 3, 4, 5. Several layers of identical and / or different quantum dots can be stacked on top of each other. The quantum dots can be arranged regularly or randomly.
- quantum dots can be associated with an advantage, since quantum dots can have a larger absorption range compared to phosphors which absorb only in a relatively limited wavelength range.
- the converted light from the conversion elements 3, 4, 5 is preferably and largely discharged via the lateral surfaces 3a, 4a, 5a.
- the quantum dots can now be designed such that a subsequent conversion element 4, 5 can also convert this light, which has already been influenced by a conversion element 3, 4 previously lying in the propagation direction of the excitation light. As a result, the efficiency of the lighting device 1 could be increased.
- FIG. 2 shows a lighting device 1 of the present invention according to a second embodiment.
- the second embodiment is the same in most features of the first embodiment.
- a light source 2 and at least two, preferably three conversion elements 3, 4, 5 are provided, which are arranged one behind the other with the corresponding intermediate distances 7, 8 in the propagation direction 6 of the light from the light source 2.
- the difference from the lighting device 1 of the first embodiment is that the conversion elements 3, 4, 5 are not formed as full, ie round or oval discs, but are semi-circular discs or plates.
- such semicircular conversion elements 3, 4, 5 have an end face 3c, 4c, 5c, ie, a sectional area in comparison with a circular conversion element.
- each of the conversion elements 3, 4, 5 may be provided with a reflection element, for example a mirror layer or a light-reflecting film.
- a reflection element for example a mirror layer or a light-reflecting film.
- the Ab beam angle is thus only about 180 ° compared to 360 ° for the lighting device 1 of the first embodiment.
- the lighting device 1 of the second embodiment is advantageously usable as a replacement for neon lights.
- other cross-sections of the conversion elements 3, 4, 5 conceivable, such as. Square, rectangular, triangular, oval, or the like.
- the present invention also includes a corresponding method for producing mixed light or white light.
- a specific wavelength ⁇ 2 is generated, for example by a light source 2 such as an LED, OLED, a laser or the like.
- This excitation light is then partially converted into light of at least two different wavelengths ⁇ 3 and ⁇ 4 by at least a first and a second conversion element 3, 4.
- light of wavelength ⁇ 3 from a first conversion element 3 does not largely enter a second conversion element 4.
- This is achieved by the conversion elements 3, 4 are arranged at a distance to each other, so that secondarily generated light is directed by total reflection at the exit accordingly.
- the apparatus and method of the present invention enable homogeneous generation of mixed light, preferably white light, without having to use the conversion agents, such as phosphors or quantum dots, in a greater amount than is actually required for the desired light generation. This is particularly possible because an interaction of various conversion elements 3, 4, 5 or the conversion means contained therein is minimized in the present invention by the conversion elements 3, 4, 5 separated by a distance, in particular a thin air gap, from each other.
- the present invention therefore improves upon the known prior art.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Led Device Packages (AREA)
- Planar Illumination Modules (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202013101431.1U DE202013101431U1 (de) | 2013-04-04 | 2013-04-04 | Leuchtvorrichtung zur Erzeugung von Weißlicht |
PCT/EP2014/056677 WO2014161927A1 (fr) | 2013-04-04 | 2014-04-03 | Dispositif lumineux servant à générer de la lumière blanche |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2986906A1 true EP2986906A1 (fr) | 2016-02-24 |
EP2986906B1 EP2986906B1 (fr) | 2017-06-14 |
Family
ID=50624545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14720052.1A Active EP2986906B1 (fr) | 2013-04-04 | 2014-04-03 | Dispositif lumineux servant à générer de la lumière blanche |
Country Status (4)
Country | Link |
---|---|
US (1) | US20160053949A1 (fr) |
EP (1) | EP2986906B1 (fr) |
DE (1) | DE202013101431U1 (fr) |
WO (1) | WO2014161927A1 (fr) |
Families Citing this family (101)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9961745B2 (en) | 2013-11-21 | 2018-05-01 | Ford Global Technologies, Llc | Printed LED rylene dye welcome/farewell lighting |
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RU2508616C2 (ru) * | 2008-02-27 | 2014-02-27 | Конинклейке Филипс Электроникс Н.В. | Осветительное устройство с сид и одним или более пропускающими окнами |
US8083364B2 (en) * | 2008-12-29 | 2011-12-27 | Osram Sylvania Inc. | Remote phosphor LED illumination system |
WO2011142179A1 (fr) * | 2010-05-13 | 2011-11-17 | オリンパス株式会社 | Dispositif d'éclairage |
JP4974310B2 (ja) * | 2010-10-15 | 2012-07-11 | 三菱化学株式会社 | 白色発光装置及び照明器具 |
TWI407041B (zh) * | 2010-10-20 | 2013-09-01 | Hon Hai Prec Ind Co Ltd | 可調整色溫的led光源 |
US9412905B2 (en) * | 2011-04-01 | 2016-08-09 | Najing Technology Corporation Limited | White light emitting device |
JP2014530449A (ja) * | 2011-09-09 | 2014-11-17 | コーニンクレッカ フィリップス エヌ ヴェ | 発光装置 |
-
2013
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2014
- 2014-04-03 US US14/782,495 patent/US20160053949A1/en not_active Abandoned
- 2014-04-03 WO PCT/EP2014/056677 patent/WO2014161927A1/fr active Application Filing
- 2014-04-03 EP EP14720052.1A patent/EP2986906B1/fr active Active
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US20160053949A1 (en) | 2016-02-25 |
DE202013101431U1 (de) | 2014-07-09 |
EP2986906B1 (fr) | 2017-06-14 |
WO2014161927A1 (fr) | 2014-10-09 |
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