EP2660503A1 - Lamp - Google Patents

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Publication number
EP2660503A1
EP2660503A1 EP20120166723 EP12166723A EP2660503A1 EP 2660503 A1 EP2660503 A1 EP 2660503A1 EP 20120166723 EP20120166723 EP 20120166723 EP 12166723 A EP12166723 A EP 12166723A EP 2660503 A1 EP2660503 A1 EP 2660503A1
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EP
European Patent Office
Prior art keywords
layer
light
color conversion
screen
luminaire according
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
Application number
EP20120166723
Other languages
German (de)
French (fr)
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EP2660503B1 (en
Inventor
Franz Schrank
Alexander Rinderhofer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonic Jennersdorf GmbH
Original Assignee
Tridonic Jennersdorf GmbH
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 Tridonic Jennersdorf GmbH filed Critical Tridonic Jennersdorf GmbH
Priority to EP12166723.2A priority Critical patent/EP2660503B1/en
Priority to PCT/EP2013/059257 priority patent/WO2013164451A1/en
Priority to EP13722350.9A priority patent/EP2844909A1/en
Publication of EP2660503A1 publication Critical patent/EP2660503A1/en
Application granted granted Critical
Publication of EP2660503B1 publication Critical patent/EP2660503B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
    • F21V3/061—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being glass
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
    • F21V3/062—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics
    • 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]

Definitions

  • the invention relates to a luminaire, in particular a luminaire, using at least one light-emitting diode (LED), which forms the light source.
  • LED light-emitting diode
  • LED-based luminaires have numerous advantages over conventional luminaires, such as incandescent lamps. In addition to the lower energy consumption to achieve a specific light intensity, these semiconductors can emit light of different colors.
  • phosphors are often used.
  • the term "phosphor” is used here more generally for color conversion phosphors. These materials absorb at least a portion of the light emitted by an LED chip and emit light at a different wavelength. Often the phosphors are applied in one layer on the LED chip. The white light is then produced, for example, by the additive mixture of the blue LED radiation and a yellow emission of the corresponding phosphor.
  • Such an arrangement is from the US 7,972,030 B2 known.
  • a screen which is arranged at a distance from the light source (LED), coated with corresponding phosphors on at least one surface.
  • the phosphor can also be integrated into the screen.
  • the invention is based on the object to offer a lamp of the type mentioned, which is easy to manufacture, also allows the use of sensitive phosphors, in particular sensitive to moisture phosphors and preferably has advantages in terms of brightness and / or light distribution ,
  • the last two layers not only physically protect the color conversion layer but protect it, for example, from moisture and chemical attack.
  • the light source in particular a light-emitting diode, emits, for example, light of wavelength up to 500 nm, ie in particular blue light.
  • the selection of corresponding color conversion phosphors makes it possible to emit light of green color (500 to 550 nm) or yellow color (> 550 to 570 nm), orange light (> 570 to 610 nm) to red light (> 610 to 660 nm).
  • the screen of a lamp according to the invention may have at least one layer in the form of a film.
  • the first and third layer may be designed as a film, but also the color conversion layer.
  • the plates or foils of the first and third layers may have coatings with certain reflective properties.
  • the first layer foil, plate
  • the first layer may have a coating that reflects light of first and second wavelength backscattered by the color conversion layer. This measure increases the overall efficiency of the luminaire.
  • the color conversion layer may be applied to a support material.
  • This carrier material may be a discrete film. However, the carrier material can also be formed by the first or third layer.
  • the described sandwich construction can be implemented in particular as a composite element in which the first layer and the third layer consist of plastic and the color conversion layer between the first Layer and the third layer is laminated. In this way, the color conversion layer can be hermetically sealed on all sides with respect to the first layer and the third layer.
  • the screen consists of a composite element in which the first layer and the third layer consist of glass.
  • the color conversion layer running in between may, for example, be a coating of the first and / or second glass layer or consist of a discrete layer, for example a film.
  • the sensitive color conversion layer can be optimally protected against moisture, for example, by the first and third layers.
  • the surfaces of the first and third layers are larger than the surface of the color conversion layer so that the first and third layers can be connected directly to one another at the edge in order to optimize the tightness of the entire device ..
  • the glass embodiment meets particularly high quality and luminous efficacy requirements.
  • the color conversion layer (phosphor layer) consists for example of one or more color conversion phosphors and an organic binder or support material.
  • the color conversion layer may contain additives, for example from the group: light-scattering particles, color pigments.
  • light-scattering particles for example, colorless inorganic or organic particles can be used.
  • the grain size of these particles may be in the range of the wavelength of the light or above.
  • the task of the light-scattering particles is to scatter the light emitted by the color conversion layer, that is, to create a uniform distribution of the light intensity in the area and to optimize the light emission.
  • the invention proposes to use light-scattering particles whose refractive index is different from the refractive index of the environment.
  • the refractive index also called the refractive index, is a dimensionless quantity that characterizes the optical material property and indicates by what factor the wavelength and the phase velocity of the light are smaller than in a vacuum.
  • Suitable light-scattering particles are: barium sulfate, barium titanate, magnesium carbonate, magnesium hydroxide, calcium carbonate, zinc oxide, aluminum oxide, yttrium aluminum oxide, titanium dioxide, boron nitride, aluminum nitride, silicone resin. These materials are used, for example, as powders with particle sizes in the range up to 60 ⁇ m, for example in the range from 0.1 to 50 ⁇ m, in particular from 0.4 to 20 ⁇ m.
  • the self-absorption of these particles should be as low as possible.
  • the so-called color factor L * (L * a * b * color space, determined in accordance with DIN EN ISO 11644-4) should, for example, be between 90 and 100 with lower alternative limit values, for example at 95 or 97.
  • the addition of the light-scattering particles has the further advantage that they reduce the erfoderlichen proportion of phosphors, thereby reducing the cost be lowered.
  • the main advantage is the ability to increase the overall brightness of the luminaire by using these particles (scattering agent) within the second layer of the screen.
  • the screen heats up. Also, the property of the phosphors is known that the efficiency of their light emission decreases with increasing temperature. This effect is called temperature quenching.
  • the invention makes it possible to reduce this problem in two directions.
  • the light output per unit area can be limited, or in other words: for the same light output, the area of the screen of the remote light is increased.
  • the associated additional costs are compensated by the possibility of reducing the proportion of expensive phosphors, if at the same time the said light-scattering particles are used.
  • the brightness of the luminaire as a whole can be increased.
  • the increase in efficiency causes a corresponding reduction in the loss of light energy. Losses are always released in the form of heat to the environment. The heat development within the second layer is reduced accordingly.
  • the sandwich structure of the screen and the hermetic encapsulation of the color conversion layer make it possible, for example, to use phosphors with limited climatic resistance or reduced moisture resistance.
  • low cost siliceous phosphors can be used even when the luminaire is used in a humid environment.
  • a further embodiment of the invention provides that the third layer is designed in such a way or in which between the color conversion layer and the third layer, an intermediate layer is designed and arranged so that the color conversion layer is not recognizable or changed in color for a viewer from the outside.
  • the often yellow color of the color conversion layer may interfere, especially when the luminaire is off.
  • the third layer can be frosted, structured and / or colored, for example.
  • Corresponding properties may also include any intermediate layer. In function and effect, these measures are similar to a "diffuser" or a "diffuser element”.
  • the luminaire according to the invention offers the possibility of forming the screen with structured surfaces (profilings), so that almost any designs can be produced.
  • the screen and correspondingly the layers may be planar.
  • the screen can also assume any three-dimensional geometric shapes.
  • the multilayer structure of the screen remains unchanged.
  • the lamp shown consists of a cylindrical housing 10 with a bottom 12 and a circumferential cylinder wall 14. Inside, a light-imitating diode 16 is arranged on the bottom 12, which emits short-wave, blue light having a wavelength of about 450 to 470 nm.
  • the lamp 10 Opposite the floor 12 and at a distance from the floor 12, the lamp 10 has a screen 20 which consists of three layers. A first layer S1, adjacent to the bottom 12. A second layer S2 and an outer layer S3.
  • the layers S1, S3 are made of glass.
  • the layer S2 consists of several color conversion phosphors (phosphors), which are assembled on a film.
  • the selection of the color conversion phosphors is such that the luminaire 10 emits white light in total of a wavelength> 500 nm when the diode 16 directs blue light onto the layer S2.
  • FIG. 1 is schematically illustrated the encapsulation of the layer S2 through the layers S1, S3, characterized in that the layer S2 also edge of the layers S1, S3 is included.
  • a hermetic seal of the layer S2 is achieved by the layers S1, S3, whereby the technical effects and advantages described above are achieved.
  • the layer S2 contains about 3% by weight of baryte, which consists of 90% particles whose particle size is between 1 and 10 ⁇ m.
  • the baryte forms the mentioned light-scattering particles within the umbrella structure. It is evenly distributed in the layer S2.
  • To adjust the light emission of the barite portion can be lowered, for example, up to 1% by mass or up to 6% by mass.
  • the described remote configuration in the composite embodiment serves to emit light of the wavelength L2 from the screen scattered and uniformly outward, the wavelength L2 being greater than the wavelength L1 is.
  • a further layer may be arranged, which covers the color conversion layer S2 and which is formed such that the color of the layer S2 for the Betrahcter is no longer recognizable from the outside.
  • the embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that the screen 20 is not planar, but designed in the manner of a hemisphere.
  • An external profiling 20s is partial and only schematically indicated.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Luminescent Compositions (AREA)
  • Led Device Packages (AREA)

Abstract

The lamp has an LED (16) that is arranged at specific distance from a screen (20) so that light from the LED falls on an inner side of screen. A light transmission layer (S1) of screen is set for transmitting light of first wavelength (L1). A color conversion layer (S2) is made of color-converting phosphor material and support material. A light transmission layer (S3) is set for transmitting light of first wavelength and second wavelength (L2) which is larger than first wavelength. The light transmission layers are made of plastic or glass material.

Description

Die Erfindung betrifft eine Leuchte, insbesondere eine Leuchte unter Verwendung mindestens einer lichtemittierenden Diode (LED), die die Lichtquelle bildet.The invention relates to a luminaire, in particular a luminaire, using at least one light-emitting diode (LED), which forms the light source.

LED basierte Leuchten haben gegenüber konventionellen Leuchten, beispielsweise mit Glühlampen, zahlreiche Vorteile. Neben dem geringeren Energieverbrauch zur Erzielung einer bestimmten Lichtstärke können diese Halbleiter Licht unterschiedlicher Farbe emittieren.LED-based luminaires have numerous advantages over conventional luminaires, such as incandescent lamps. In addition to the lower energy consumption to achieve a specific light intensity, these semiconductors can emit light of different colors.

Für weiße LED Lichtquellen werden häufig sogenannte Phosphore eingesetzt. Der Begriff "Phosphor" wird hier ganz allgemein für Farbkonversionsleuchtstoffe benutzt. Diese Materialien absorbieren zumindest einen Teil des von einem LED Chip abgestrahlten Lichts und emittieren Licht in einer anderen Wellenlänge. Oft werden die Phosphore in einer Schicht auf den LED Chip aufgebracht. Das weiße Licht entsteht dann beispielsweise durch die additive Mischung der blauen LED Strahlung und einer gelben Emission des entsprechenden Phosphors.For white LED light sources so-called phosphors are often used. The term "phosphor" is used here more generally for color conversion phosphors. These materials absorb at least a portion of the light emitted by an LED chip and emit light at a different wavelength. Often the phosphors are applied in one layer on the LED chip. The white light is then produced, for example, by the additive mixture of the blue LED radiation and a yellow emission of the corresponding phosphor.

Daneben sind sogenannte Remote-Lösungen bekannt. Darunter versteht man in der LED-Technik eine Anordnung, bei der der Phosphor (eine Phosphor-Schicht) im Abstand zur LED-Lichtquelle angeordnet wird. Entsprechend wird der Farbkonversionsleuchtstoff von der LED-Lichtquelle mit einer bestimmten Wellenlänge bestrahlt. Dieses Licht, das auch als Primärstrahlung bezeichnet werden kann, wird vom Farbkonversionsleuchtstoff (Phosphor) zumindest teilweise absorbiert. Das absorbierte Licht wird vom Phosphor dann in einer anderen Wellenlänge wieder abgegeben, also emittiert.In addition, so-called remote solutions are known. This is understood in the LED technology, an arrangement in which the phosphor (a phosphor layer) is arranged at a distance from the LED light source. Accordingly, the color conversion phosphor of the LED light source with a irradiated at certain wavelengths. This light, which can also be referred to as primary radiation, is at least partially absorbed by the color conversion luminescent material (phosphorus). The absorbed light is then released by the phosphor in another wavelength, ie emitted.

Eine solche Anordnung ist aus der US 7,972,030 B2 bekannt. Dabei wird ein Schirm, der im Abstand zur Lichtquelle (LED) angeordnet ist, mit entsprechenden Phosphoren auf mindestens einer Oberfläche beschichtet. Der Phosphor kann auch in den Schirm integriert werden.Such an arrangement is from the US 7,972,030 B2 known. In this case, a screen, which is arranged at a distance from the light source (LED), coated with corresponding phosphors on at least one surface. The phosphor can also be integrated into the screen.

Bei dieser Leuchte wird die Effizienz in Bezug auf eine gewisse Leistung der LED erhöht. Außerdem wird eine Vergleichmäßigung des emittierten Lichts erreicht.With this lamp, the efficiency is increased in relation to a certain power of the LED. In addition, a homogenization of the emitted light is achieved.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zu Grunde, eine Leuchte der genannten Art anzubieten, die einfach in der Herstellung ist, auch die Verwendung empfindlicher Phosphore, insbesondere gegenüber Feuchtigkeit empfindlicher Phosphore ermöglicht und vorzugsweise hinsichtlich Helligkeit und/oder Lichtverteilung Vorteile aufweist.Based on this prior art, the invention is based on the object to offer a lamp of the type mentioned, which is easy to manufacture, also allows the use of sensitive phosphors, in particular sensitive to moisture phosphors and preferably has advantages in terms of brightness and / or light distribution ,

Der Erfindung liegt folgende Erkenntnis zu Grunde:

  • Ausgangspunkt ist eine Remote-Gestaltung einer Leuchte. Der im Abstand zur LED angeordnete Schirm soll erfindungsgemäß mindestens dreilagig aufgebaut sein, wobei eine Phosphor-Schicht (Farbkonversionsschicht) sandwichartig zwischen den beiden anderen Schichten eingeschlossen wird.
The invention is based on the following finding:
  • The starting point is a remote design of a luminaire. The arranged at a distance from the LED screen should be constructed according to the invention at least three layers, wherein a phosphor layer (color conversion layer) is sandwiched between the other two layers.

Die beiden zuletzt genannten Schichten schützen nicht nur die Farbkonversionsschicht physisch, sondern sie schützen sie beispielsweise vor Feuchtigkeit und chemischen Angriffen.The last two layers not only physically protect the color conversion layer but protect it, for example, from moisture and chemical attack.

Dadurch wird nicht nur die Farbkonversionsschicht als solche geschützt, sondern auch ihre Qualität und Leistung über einen längeren Zeitraum konstant gehalten.This not only protects the color conversion layer as such, but also keeps its quality and performance constant over an extended period of time.

Ausgehend von einer Leuchte mit folgenden Merkmalen:

  • einer Lichtquelle, die Licht einer ersten Wellenlänge emittiert,
    und
  • einem Schirm, der im Abstand zur Lichtquelle und so angeordnet ist, dass das Licht erster Wellenlänge von der Lichtquelle auf eine Innenseite des Schirms fällt,
besteht die Erfindung in ihrer allgemeinsten Ausführungsform darin, dass
  • der Schirm mindestens dreilagig aufgebaut ist und zwar, von innen, der Lichtquelle zugewandt, nach außen:
  • mit einer ersten Schicht aus Kunststoff oder Glas, die für das Licht erster Wellenlänge durchlässig ist,
  • einer Farbkonversionsschicht aus mindestens einem Farbkonversionsleuchtstoff und mindestens einem Trägermaterial,
  • einer dritten Schicht aus Kunststoff oder Glas, die für ein Licht erster und zweiter Wellenlänge durchlässig ist,
  • wobei die zweite Wellenlänge größer als die erste Wellenlänge ist.
Starting with a lamp with the following features:
  • a light source emitting light of a first wavelength,
    and
  • a screen spaced from the light source and arranged so that the first wavelength light from the light source falls on an inside of the screen,
the invention in its most general embodiment is that
  • the screen is constructed at least three layers, namely, from the inside, facing the light source, to the outside:
  • with a first layer of plastic or glass which is permeable to the first wavelength light,
  • a color conversion layer of at least one color conversion luminescent material and at least one carrier material,
  • a third layer of plastic or glass permeable to first and second wavelength light,
  • wherein the second wavelength is greater than the first wavelength.

Die Lichtquelle, insbesondere eine lichtemittierende Diode, emitttiert beispielsweise Licht der Wellenlänge bis 500 nm, also insbesondere blaues Licht.The light source, in particular a light-emitting diode, emits, for example, light of wavelength up to 500 nm, ie in particular blue light.

Die Auswahl entsprechender Farbkonversionsleuchtstoffe ermöglicht es, Licht grüner Farbe (500 bis 550 nm) oder gelber Farbe (>550 bis 570 nm), orangefarbenes Licht (>570 bis 610 nm) bis zu rotem Licht (>610 bis 660 nm) zu emittieren.The selection of corresponding color conversion phosphors makes it possible to emit light of green color (500 to 550 nm) or yellow color (> 550 to 570 nm), orange light (> 570 to 610 nm) to red light (> 610 to 660 nm).

Der Schirm einer erfindungsgemäßen Leuchte kann mindestens eine Schicht in Form einer Folie aufweisen.The screen of a lamp according to the invention may have at least one layer in the form of a film.

Insbesondere können die erste und dritte Schicht als Folie gestaltet sein, aber auch die Farbkonversionsschicht.In particular, the first and third layer may be designed as a film, but also the color conversion layer.

Ebenso ist es möglich, eine oder mehrere der Schichten in Form einer Platte auszuführen, beispielweise einer weitgehend biegesteifen Platte.It is also possible to carry out one or more of the layers in the form of a plate, for example a substantially rigid plate.

Die Platten oder Folien der ersten und dritten Schicht können Beschichtungen mit bestimmten Reflexionseigenschaften aufweisen. Beispielswesie kann die erste Schicht (Folie, Platte) eine Beschichtung aufweisen, mit der Licht erster und zweiter Wellenlänge, das durch die Farbkonversionsschicht zurückgestreut wird, wieder reflektiert wird. Diese Maßnahme erhöht die Effizienz der Leuchte insgesamt.The plates or foils of the first and third layers may have coatings with certain reflective properties. For example, the first layer (foil, plate) may have a coating that reflects light of first and second wavelength backscattered by the color conversion layer. This measure increases the overall efficiency of the luminaire.

Die Farbkonversionsschicht kann auf ein Trägermaterial aufgetragen sein. Dieses Trägermaterial kann eine diskrete Folie sein. Das Trägermaterial kann aber auch von der ersten oder dritten Schicht gebildet werden.The color conversion layer may be applied to a support material. This carrier material may be a discrete film. However, the carrier material can also be formed by the first or third layer.

Der beschriebene Sandwichaufbau lässt sich insbesondere als Verbundelement ausführen, bei dem die erste Schicht und die dritte Schicht aus Kunststoff bestehen und die Farbkonversionsschicht zwischen der ersten Schicht und der dritten Schicht einlaminiert ist. Auf diese Weise lässt sich die Farbkonversionsschicht allseitig hermetisch gegenüber der ersten Schicht und der dritten Schicht abdichten.The described sandwich construction can be implemented in particular as a composite element in which the first layer and the third layer consist of plastic and the color conversion layer between the first Layer and the third layer is laminated. In this way, the color conversion layer can be hermetically sealed on all sides with respect to the first layer and the third layer.

Dies gilt analog für eine Ausführungsform, bei der der Schirm aus einem Verbundelement besteht, bei dem die erste Schicht und die dritte Schicht aus Glas bestehen. Die dazwischen verlaufende Farbkonversionsschicht kann beispielsweise eine Beschichtung der ersten und/oder zweiten Glasschicht sein oder aus einer diskreten Schicht, beispielsweise einer Folie bestehen.This applies analogously to an embodiment in which the screen consists of a composite element in which the first layer and the third layer consist of glass. The color conversion layer running in between may, for example, be a coating of the first and / or second glass layer or consist of a discrete layer, for example a film.

In beiden Ausführungsvarianten (Kunststoff, Glas) lässt sich die empfindliche Farbkonversionsschicht durch die erste und dritte Schicht optimal beispielsweise gegenüber Feuchtigkeit schützen.In both variants (plastic, glass), the sensitive color conversion layer can be optimally protected against moisture, for example, by the first and third layers.

Um die dazu gewünschte hermetische Abdichtung zu erreichen ist es vorteilhaft, wenn die Flächen der erste und dritte Schicht größer sind als die Fläche der Farbkonversionsschicht, so dass randseitig die erste und dritte Schicht unmittelbar miteinander verbunden werden können, um die Dichtigkeit der gesamten Einrichtung zu optimieren..In order to achieve the hermetic seal desired for this purpose, it is advantageous if the surfaces of the first and third layers are larger than the surface of the color conversion layer so that the first and third layers can be connected directly to one another at the edge in order to optimize the tightness of the entire device ..

Die Ausführungsform mit Glas erfüllt besonders hohe Anforderungen an die Qualität und Lichtausbeute.The glass embodiment meets particularly high quality and luminous efficacy requirements.

Die Farbkonversionsschicht (Phosphor-Schicht) besteht beispielsweise aus einem oder mehreren Farbkonversionsleuchtstoffen und einem organischen Bindemittel oder Trägermaterial.The color conversion layer (phosphor layer) consists for example of one or more color conversion phosphors and an organic binder or support material.

Darüber hinaus kann die Farbkonversionsschicht Zusatzstoffe enthalten, beispielsweise aus der Gruppe: Licht streuende Partikel, Farbpigmente.In addition, the color conversion layer may contain additives, for example from the group: light-scattering particles, color pigments.

Als Licht streuende Partikel können beispielsweise farblose anorganische oder organische Partikel verwendet werden. Die Korngröße dieser Teilchen kann im Bereich der Wellenlänge des Lichts oder darüber liegen. Die Licht streuenden Partikel haben die Aufgabe, das von der Farbkonversionsschicht emittierte Licht zu streuen, das heißt, eine gleichmäßige Verteilung der Lichtintensität in der Fläche zu schaffen und den Lichtaustritt zu optimieren.As light-scattering particles, for example, colorless inorganic or organic particles can be used. The grain size of these particles may be in the range of the wavelength of the light or above. The task of the light-scattering particles is to scatter the light emitted by the color conversion layer, that is, to create a uniform distribution of the light intensity in the area and to optimize the light emission.

Dazu schlägt die Erfindung vor, Licht streuende Partikel einzusetzen, deren Brechzahl unterschiedlich von der Brechzahl der Umgebung ist. Die Brechzahl, auch Brechungsindex genannt, ist eine dimensionslose Größe, die die optische Materialeigenschaft charakterisiert und angibt, um welchen Faktor die Wellenlänge und die Phasengeschwindigkeit des Lichts kleiner sind als im Vakuum.For this purpose, the invention proposes to use light-scattering particles whose refractive index is different from the refractive index of the environment. The refractive index, also called the refractive index, is a dimensionless quantity that characterizes the optical material property and indicates by what factor the wavelength and the phase velocity of the light are smaller than in a vacuum.

Dabei kommt es nur auf den absoluten Wert der Differenz der Brechzahlen von den genannten Partikeln und dem umgebenden Material an. An der Grenzfläche zwischen den Licht streuenden Partikeln und dem umgebenen Material (insbesondere Glas, Kunststoff) wird das Licht umso mehr gebrochen und reflektiert, je größer die Differenz der Brechnungs-Indices ist.It depends only on the absolute value of the difference of the refractive indices of the mentioned particles and the surrounding material. At the interface between the light-scattering particles and the surrounding material (especially glass, plastic), the larger the difference of the refractive indices, the more refracted and reflected the light.

Geeignete Licht streuende Partikel sind: Bariumsulfat, Bariumtitanat, Magnesiumcarbonat, Magnesiumhydroxid, Calciumcarbonat, Zinkoxid, Aluminiumoxid, Yttriumaluminiumoxid, Titandioxid, Bornitrid, Aluminiumnitrid, Silikonharz. Diese Materialien werden beispielsweise als Pulver mit Korngrößen im Bereich bis 60 µm, beispielsweise im Bereich 0,1 bis 50 µm, insbesondere 0,4 bis 20 µm eingesetzt.Suitable light-scattering particles are: barium sulfate, barium titanate, magnesium carbonate, magnesium hydroxide, calcium carbonate, zinc oxide, aluminum oxide, yttrium aluminum oxide, titanium dioxide, boron nitride, aluminum nitride, silicone resin. These materials are used, for example, as powders with particle sizes in the range up to 60 μm, for example in the range from 0.1 to 50 μm, in particular from 0.4 to 20 μm.

Die Selbstabsorption dieser Partikel soll möglichst gering sein. Die sogenannte Farbmaßzahl L* (L*a*b* Farbraum, bestimmt gemäß DIN EN ISO 11644-4) soll beispielsweise zwischen 90 und 100 liegen mit unteren alternativen Grenzwerten beispielsweise bei 95 oder 97.The self-absorption of these particles should be as low as possible. The so-called color factor L * (L * a * b * color space, determined in accordance with DIN EN ISO 11644-4) should, for example, be between 90 and 100 with lower alternative limit values, for example at 95 or 97.

Der Zusatz der Licht streuenden Partikel hat den weiteren Vorteil, dass diese den erfoderlichen Anteil der Phosphore verringern, wodurch die Kosten gesenkt werden. Der wesentliche Vorteil ist jedoch die Möglichkeit, durch Einsatz dieser Partikel (Streumittel) innerhalb der zweiten Schicht des Schirms, die Helligkeit der Leuchte insgesamt zu erhöhen.The addition of the light-scattering particles has the further advantage that they reduce the erfoderlichen proportion of phosphors, thereby reducing the cost be lowered. The main advantage, however, is the ability to increase the overall brightness of the luminaire by using these particles (scattering agent) within the second layer of the screen.

Im Betrieb kommt es zu einer Erwärmung des Schirms. Auch ist die Eigenschaft der Phosphore bekannt, dass die Effizienz ihrer Licht-Emission mit steigender Temperatur abnimmt. Dieser Effekt wird als Temperturquenching (temperature quenching) bezeichnet.During operation, the screen heats up. Also, the property of the phosphors is known that the efficiency of their light emission decreases with increasing temperature. This effect is called temperature quenching.

Die Erfindung ermöglicht es, dieses Problem in zwei Richtungen zu reduzieren.The invention makes it possible to reduce this problem in two directions.

Zum einen kann zur Vermeidung einer thermischen Überlastung die Lichtleistung pro Flächeneinheit beschränkt werden, oder anders ausgedrückt: für die gleiche Lichtleistung wird die Fläche des Schirms der Remote-Leuchte vergrößert. Die damit verbundenen Mehrkosten werden kompensiert durch die Möglichkeit, den Anteil der teueren Phosphore zu reduzieren, wenn gleichzeitig die genannten Licht streuenden Partikel eingesetzt werden.Firstly, to avoid thermal overloading, the light output per unit area can be limited, or in other words: for the same light output, the area of the screen of the remote light is increased. The associated additional costs are compensated by the possibility of reducing the proportion of expensive phosphors, if at the same time the said light-scattering particles are used.

Zum anderen kann durch Zugabe von Licht streuenden Partikeln zu den Phosphoren die Helligkeit der Leuchte insgesamt erhöht werden. Die Steigerung der Effizienz bewirkt eine entsprechende Verminderung der Verluste an Lichtenergie. Verluste werden immer in Form von Wärme an die Umgebung abgegeben. Die Wärmeentwicklung innerhalb der zweiten Schicht wird entsprechend reduziert.On the other hand, by adding light-scattering particles to the phosphors, the brightness of the luminaire as a whole can be increased. The increase in efficiency causes a corresponding reduction in the loss of light energy. Losses are always released in the form of heat to the environment. The heat development within the second layer is reduced accordingly.

In beiden Fällen wird die Temperaturentwicklung innerhalb des Schirms reduziert. Dadurch werden auch die benachbarten Schichten thermisch weniger beansprucht und es können entsprechende Werkstoffe dafür ausgewählt werden.In both cases, the temperature development within the screen is reduced. As a result, the adjacent layers are thermally less stressed and appropriate materials can be selected for it.

Der sandwichartige Aufbau des Schirms und die hermetische Kapselung der Farbkonversionsschicht ermöglichen es, beispielsweise Phosphore mit eingeschränkter Klimabeständigkeit oder reduzierter Feuchtigkeitsbeständigkeit einzusetzen.The sandwich structure of the screen and the hermetic encapsulation of the color conversion layer make it possible, for example, to use phosphors with limited climatic resistance or reduced moisture resistance.

So können zum Beispiel kostengünstige silikatische Phosphore auch dann eingesetzt werden, wenn die Leuchte in feuchter Umgebung benutzt wird.For example, low cost siliceous phosphors can be used even when the luminaire is used in a humid environment.

Dies gilt analog für empfindliche sulfidische Leuchtstoffe oder Nitride, beispielsweise Nitridosilikate.This applies analogously to sensitive sulfidic phosphors or nitrides, for example nitridosilicates.

Alle bekannten Phosphore können im Rahmen einer erfindungsgemäßen Leuchte problemlos eingesetzt werden. Nachstehend sind Beispiele geeigneter Farbkonversionsstoffe aufgeführt:

  • ● Cer dotierte Granate (Y3Al5O12:Ce und Ln3Al5O12 :Ce; Ln = Element aus der Gruppe der Lanthanoide)
  • ● Phosphate (YPO4:Ce)
  • ● Europium dotierte Sulfide ((Ca,Sr)S:Eu)
  • ● Europium dotierte Silikate ((Ba, Sr, Ca)2SiO4:Eu)
  • ● Nitridosilikate ((Ca, Sr, Ba)2Si5N8:Eu)
  • ● verschiedene Nitride und Oxonitride ((Sr,Ca)AlSiN3:Eu, Sr2Si5-xAlxN8-xOx:Eu, SrSi2N2O2:Eu)
All known phosphors can be used without problems in the context of a luminaire according to the invention. The following are examples of suitable color conversion materials:
  • ● cerium-doped garnets (Y 3 Al 5 O 12 : Ce and Ln 3 Al 5 O 12 : Ce; Ln = element from the group of lanthanides)
  • ● phosphates (YPO 4 : Ce)
  • ● Europium doped sulfides ((Ca, Sr) S: Eu)
  • ● europium-doped silicates ((Ba, Sr, Ca) 2 SiO 4 : Eu)
  • ● nitridosilicates ((Ca, Sr, Ba) 2 Si 5 N 8 : Eu)
  • ● various nitrides and oxonitrides ((Sr, Ca) AlSiN 3 : Eu, Sr 2 Si 5-x Al x N 8 -x O x : Eu, SrSi 2 N 2 O 2 : Eu)

Eine weitere Ausführungsform der Erfindung sieht vor, dass die dritte Schicht so ausgeführt ist oder bei der zwischen Farbkonversionsschicht und dritter Schicht eine Zwischenschicht so ausgeführt und angeordnet ist, dass die Farbkonversionsschicht für einen Betrachter von außen nicht erkennbar oder farblich verändert ist.A further embodiment of the invention provides that the third layer is designed in such a way or in which between the color conversion layer and the third layer, an intermediate layer is designed and arranged so that the color conversion layer is not recognizable or changed in color for a viewer from the outside.

Bei bestimmten Anwendungen kann die häufig gelbe Farbe der Farbkonversionsschicht stören, insbesondere dann, wenn die Leuchte ausgeschaltet ist.In certain applications, the often yellow color of the color conversion layer may interfere, especially when the luminaire is off.

Um diesen unerwünschten optischen Eindruck zu vermindern oder zu neutralisieren, wird die beschriebene Ausführung der dritten Schicht oder Zwischenschicht vorgeschlagen.In order to reduce or neutralize this undesirable visual impression, the described embodiment of the third layer or intermediate layer is proposed.

Konkret kann die dritte Schicht beispielsweise mattiert, strukturiert und/oder farblich eingetrübt werden. Entsprechende Eigenschaften kann auch eine etwaige Zwischenschicht aufweisen. In der Funktion und Wirkung ähneln diese Maßnahmen einer "Streuscheibe" oder einem "Diffusorelement".In concrete terms, the third layer can be frosted, structured and / or colored, for example. Corresponding properties may also include any intermediate layer. In function and effect, these measures are similar to a "diffuser" or a "diffuser element".

Dadurch wird die Helligkeit der Leuchte insgesamt zwar etwas vermindert. Sie ist aber immer noch höher als bei vergleichbaren Lösungen im Stand der Technik. Das gilt insbesondere dann, wenn die genannten Licht streuenden Partikel in der zweiten Schicht eingesetzt werden.As a result, the overall brightness of the lamp is somewhat reduced. But it is still higher than comparable solutions in the prior art. This is especially true when the said light-scattering particles are used in the second layer.

Darüber hinaus bietet die erfindungsgemäße Leuchte die Möglichkeit, den Schirm mit strukturierten Oberflächen (Profilierungen) auszubilden, so dass sich nahezu beliebige Designs herstellen lassen.In addition, the luminaire according to the invention offers the possibility of forming the screen with structured surfaces (profilings), so that almost any designs can be produced.

Der Schirm und entsprechend die Schichten können planar ausgebildet sein. Der Schirm kann aber auch beliebige dreidimensionale geometrische Formen annehmen. Der mehrschichtige Aufbau des Schirms bleibt dabei unverändert.The screen and correspondingly the layers may be planar. The screen can also assume any three-dimensional geometric shapes. The multilayer structure of the screen remains unchanged.

Weitere Merkmale der Erfindung ergeben sich aus den Merkmalen der Unteransprüche sowie den sonstigen Anmeldungsunterlagen.Other features of the invention will become apparent from the features of the claims and the other application documents.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert.The invention will be explained in more detail below with reference to an embodiment.

Dabei zeigen, jeweils in stark schematisierter Darstellung

Fig. 1:
ein erstes Ausführungsbeispiel einer erfindungsgemäßen Leuchte (im Längsschnitt),
Fig. 2:
eine Darstellung analog Figur 1 für eine weitere Ausführungsform.
This show, each in a highly schematic representation
Fig. 1:
A first embodiment of a lamp according to the invention (in longitudinal section),
Fig. 2:
a representation analog FIG. 1 for another embodiment.

In den Figuren sind gleiche oder gleiche Bauteile mit gleichen Bezugsziffern dargestellt.In the figures, the same or the same components are represented by the same reference numerals.

Die in Figur 1 dargestellte Leuchte besteht aus einem zylinderförmigen Gehäuse 10 mit einem Boden 12 und einer umlaufenden Zylinderwand 14. Innenseitig ist auf dem Boden 12 eine Licht imitierende Diode 16 angeordnet, die kurzwelliges, blaues Licht mit einer Wellenlänge von ca. 450 bis 470 nm emittiert.In the FIG. 1 The lamp shown consists of a cylindrical housing 10 with a bottom 12 and a circumferential cylinder wall 14. Inside, a light-imitating diode 16 is arranged on the bottom 12, which emits short-wave, blue light having a wavelength of about 450 to 470 nm.

Gegenüber dem Boden 12 und mit Abstand zum Boden 12 weist die Leuchte 10 einen Schirm 20 auf, der aus drei Schichten besteht. Einer ersten Schicht S1, dem Boden 12 benachbart. Einer zweiten Schicht S2 und einer äußeren Schicht S3.Opposite the floor 12 and at a distance from the floor 12, the lamp 10 has a screen 20 which consists of three layers. A first layer S1, adjacent to the bottom 12. A second layer S2 and an outer layer S3.

Die Schichten S1, S3 bestehen aus Glas.The layers S1, S3 are made of glass.

Die Schicht S2 besteht aus mehreren Farbkonversionsleuchtstoffen (Phosphoren), die auf einer Folie konfektioniert sind. Die Auswahl der Farbkonversionsleuchtstoffe ist so, dass die Leuchte 10 insgesamt weißes Licht einer Wellenlänge > 500 nm emittiert, wenn die Diode 16 blaues Licht auf die Schicht S2 richtet.The layer S2 consists of several color conversion phosphors (phosphors), which are assembled on a film. The selection of the color conversion phosphors is such that the luminaire 10 emits white light in total of a wavelength> 500 nm when the diode 16 directs blue light onto the layer S2.

In Figur 1 ist schematisch die Einkapselung der Schicht S2 durch die Schichten S1, S3 dadurch dargestellt, dass die Schicht S2 auch randseitig von den Schichten S1, S3 umfasst wird. Dadurch wird eine hermetische Abdichtung der Schicht S2 durch die Schichten S1, S3 erreicht, wodurch die vorstehend beschriebenen technischen Effekte und Vorteile erzielt werden.In FIG. 1 is schematically illustrated the encapsulation of the layer S2 through the layers S1, S3, characterized in that the layer S2 also edge of the layers S1, S3 is included. As a result, a hermetic seal of the layer S2 is achieved by the layers S1, S3, whereby the technical effects and advantages described above are achieved.

Zu erwähnen ist noch, dass die Schicht S2 neben den Farbkonversionsleuchtstoffen und einem organischen Bindemittel ca. 3 Masse-% Baryt enthält, der zu 90 % aus Teilchen besteht, deren Teilchengröße zwischen 1 und 10 µm liegt. Der Baryt bildet die erwähnten Licht streuenden Partikel innerhalb des Schirmaufbaus. Es ist gleichmäßig in der Schicht S2 verteilt. Zur Einstellung der Lichtemission kann der Baryt-Anteil beispielsweise auf bis zu 1 Masse-% abgesenkt oder auf bis zu 6 Masse-% angehoben werden.It should also be mentioned that, in addition to the color conversion phosphors and an organic binder, the layer S2 contains about 3% by weight of baryte, which consists of 90% particles whose particle size is between 1 and 10 μm. The baryte forms the mentioned light-scattering particles within the umbrella structure. It is evenly distributed in the layer S2. To adjust the light emission of the barite portion can be lowered, for example, up to 1% by mass or up to 6% by mass.

Während Licht der Wellenlänge L1 von der LED 16 in Richtung auf den Schirm 20 emittiert wird dient der beschriebene Remote-Aufbau in der Verbundausführung dazu, Licht der Wellenlänge L2 vom Schirmgestreut und gleichmäßig nach außen zu emittieren, wobei die Wellenlänge L2 größer als die Wellenlänge L1 ist.While light of the wavelength L1 is emitted from the LED 16 toward the screen 20, the described remote configuration in the composite embodiment serves to emit light of the wavelength L2 from the screen scattered and uniformly outward, the wavelength L2 being greater than the wavelength L1 is.

In einer Alternative kann zwischen der Schicht S2 und der Schicht S3 eine weitere Schicht angeordnet sein, die die Farbkonversionsschicht S2 überdeckt und die so ausgebildet ist, dass die Farbe der Schicht S2 für den Betrahcter von außen nicht mehr erkennbar ist.In an alternative, between the layer S2 and the layer S3, a further layer may be arranged, which covers the color conversion layer S2 and which is formed such that the color of the layer S2 for the Betrahcter is no longer recognizable from the outside.

Das Ausführungsbeispiel gemäß Figur 2 unterscheidet sich vom Ausführungsbeispiel gemäß Figur 1 dadurch, dass der Schirm 20 nicht planar, sondern nach Art einer Halbkugel gestaltet ist.The embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that the screen 20 is not planar, but designed in the manner of a hemisphere.

Eine außenseitige Profilierung 20s ist partiell und nur schematisch angedeutet.An external profiling 20s is partial and only schematically indicated.

Claims (14)

Leuchte mit folgenden Merkmalen: 1.1 einer Lichtquelle (16), die Licht einer ersten Wellenlänge (L1) emittiert, und 1.2 einem Schirm (20), wobei 1.2.1 der Schirm (20) im Abstand zur Lichtquelle (16) und so angeordnet ist, dass das Licht erster Wellenlänge (L1) von der Lichtquelle (16) auf eine Innenseite des Schirms (20) fällt, und 1.2.2 der Schirm (20) mindestens dreilagig aufgebaut ist, und zwar, von innen, der Lichtquelle (16) zugewandt, nach außen: 1.2.2.1 mit einer ersten Schicht (S1) aus Kunststoff oder Glas, die für das Licht erster Wellenlänge (L1) durchlässig ist, 1.2.2.2 einer Farbkonversionsschicht (S2), aus mindestens einem Farbkonversionsleuchtstoff und mindestens einem Trägermaterial, 1.2.2.3 einer dritten Schicht (S3) aus Kunststoff oder Glas, die für ein Licht erster und zweiter Wellenlänge (L1, L2) durchlässig ist, 1.2.2.4 wobei die zweite Wellenlänge (L2) größer als die erste Wellenlänge (L1) ist. Luminaire with the following features: 1.1 a light source (16) which emits light of a first wavelength (L1), and 1.2 a screen (20), wherein 1.2.1 the screen (20) is spaced from the light source (16) and arranged so that the first wavelength light (L1) from the light source (16) falls on an inside of the screen (20), and 1.2.2 the screen (20) is constructed at least three layers, namely, from the inside, the light source (16) facing outwards: 1.2.2.1 having a first layer (S1) of plastic or glass permeable to the first wavelength light (L1), 1.2.2.2 a color conversion layer (S2) comprising at least one color conversion luminescent material and at least one support material, 1.2.2.3 a third layer (S3) of plastic or glass permeable to first and second wavelength light (L1, L2), 1.2.2.4 wherein the second wavelength (L2) is greater than the first wavelength (L1). Leuchte nach Anspruch 1, bei der mindestens eine der Schichten (S1, S2, S3) in Form einer Folie gestaltet ist.Luminaire according to claim 1, wherein at least one of the layers (S1, S2, S3) is designed in the form of a film. Leuchte nach Anspruch 1, bei der mindestens eine der Schichten (S1, S2, S3) in Form einer Platte gestaltet ist.Luminaire according to claim 1, wherein at least one of the layers (S1, S2, S3) is designed in the form of a plate. Leuchte nach Anspruch 1, bei der der Schirm (20) planar gestaltet ist.Luminaire according to claim 1, wherein the screen (20) is made planar. Leuchte nach Anspruch 1, bei der die Farbkonversionsschicht (S2) auf ein Trägermaterial aufgetragen ist.Luminaire according to claim 1, wherein the color conversion layer (S2) is applied to a carrier material. Leuchte nach Anspruch 5, bei der das Trägermaterial von mindestens einer der folgenden Schichten gebildet wird: erste Schicht (S1), dritte Schicht (S3).Luminaire according to claim 5, wherein the support material is formed by at least one of the following layers: first layer (S1), third layer (S3). Leuchte nach Anspruch 1, deren Schirm aus einem Verbundelement besteht, bei dem die ersten Schicht (S1) und die dritte Schicht (S3) aus Kunststoff bestehen und die Farbkonversionsschicht (3) zwischen der ersten Schicht (S 1) und der dritten Schicht (S3) einlaminiert ist.Luminaire according to claim 1, whose screen consists of a composite element in which the first layer (S1) and the third layer (S3) are made of plastic and the color conversion layer (3) between the first layer (S 1) and the third layer (S3 ) is laminated. Leuchte nach Anspruch 8, bei der die Farbkonversionsschicht (S2) allseitig hermetisch gegenüber der ersten Schicht (S1) und der dritten Schicht (S3) abgedichtet ist.Luminaire according to claim 8, wherein the color conversion layer (S2) is hermetically sealed on all sides with respect to the first layer (S1) and the third layer (S3). Leuchte nach Anspruch 1, deren Schirm (20) aus einem Verbundelement besteht, bei dem die ersten Schicht (S1) und die dritte Schicht (S3) aus Glas und die dazwischen verlaufende Farbkonversionsschicht (S3) aus einer Folie bestehen.Luminaire according to claim 1, whose screen (20) consists of a composite element in which the first layer (S1) and the third layer (S3) of glass and the intermediate color conversion layer (S3) consist of a film. Leuchte nach Anspruch 1, bei der die Farbkonversionsschicht (S2)
mindestens einen Zusatzstoff aus der Gruppe: lichtstreuende Partikel, organische Bindemittel, Farbpigmente enthält.Luminaire according to Claim 1, in which the color conversion layer (S2)
at least one additive from the group: light-scattering particles, organic binders, color pigments contains. Leuchte nach Anspruch 1, bei der die dritte Schicht (S3) so ausgeführt
ist oder bei der zwischen Farbkonversionsschicht (S2) und dritter Schicht (S3) eine Zwischenschicht so ausgeführt und angeordnet ist, dass die Farbkonversionsschicht (S2) für einen Betrachter von außen nicht erkennbar oder farblich verändert ist.Luminaire according to Claim 1, in which the third layer (S3) is designed in this way
or at between the color conversion layer (S2) and third Layer (S3) an intermediate layer is designed and arranged so that the color conversion layer (S2) for a viewer from the outside is not recognizable or changed in color. Leuchte nach Anspruch 1, deren Lichtquelle (16) eine Licht
emittierende Diode ist.Luminaire according to claim 1, whose light source (16) is a light
is emitting diode. Leuchte nach Anspruch 1, deren Lichtquelle (16) Licht der
Wellenlänge bis 500nm emittiert.Luminaire according to claim 1, whose light source (16) light the
Wavelength emitted up to 500nm. Leuchte nach Anspruch 1, deren Schirm (20) eine Profilierung
aufweist.Luminaire according to claim 1, whose screen (20) has a profiling
having.
EP12166723.2A 2012-05-04 2012-05-04 Lamp Not-in-force EP2660503B1 (en)

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EP2844909A1 (en) 2015-03-11

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