DE102007022090A1 - Light emitting component for lamp, has light source e.g. organic LED, emitting electromagnetic radiation of specific wavelength range, and adjustable transparent element arranged between light source and conversion unit - Google Patents

Light emitting component for lamp, has light source e.g. organic LED, emitting electromagnetic radiation of specific wavelength range, and adjustable transparent element arranged between light source and conversion unit

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Publication number
DE102007022090A1
DE102007022090A1 DE102007022090A DE102007022090A DE102007022090A1 DE 102007022090 A1 DE102007022090 A1 DE 102007022090A1 DE 102007022090 A DE102007022090 A DE 102007022090A DE 102007022090 A DE102007022090 A DE 102007022090A DE 102007022090 A1 DE102007022090 A1 DE 102007022090A1
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DE
Germany
Prior art keywords
light
electromagnetic radiation
light source
wavelength range
electrode
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.)
Withdrawn
Application number
DE102007022090A
Other languages
German (de)
Inventor
Karsten Dr. Diekmann
Norwin Von Dr. Malm
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.)
Osram Opto Semiconductors GmbH
Original Assignee
Osram Opto Semiconductors 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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Priority to DE102007022090A priority Critical patent/DE102007022090A1/en
Publication of DE102007022090A1 publication Critical patent/DE102007022090A1/en
Application status is Withdrawn legal-status Critical

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L51/00Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof
    • H01L51/50Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof specially adapted for light emission, e.g. organic light emitting diodes [OLED] or polymer light emitting devices [PLED];
    • H01L51/5012Electroluminescent [EL] layer
    • H01L51/5036Multi-colour light emission, e.g. colour tuning, polymer blend, stack of electroluminescent layers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/003Controlling the distribution of the light emitted by adjustment of elements by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3225OLED integrated with another component
    • H01L27/3232OLED integrated with another component the other component being a light modulating element, e.g. electrochromic element, photochromic element, liquid crystal element
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-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
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3206Multi-colour light emission
    • H01L27/322Multi-colour light emission using colour filters or colour changing media [CCM]
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L33/00Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/44Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y02B20/36Organic LEDs, i.e. OLEDs for general illumination

Abstract

The component (20) has a light source (1) e.g. organic LED and semiconductor LED, emitting electromagnetic radiation of a specific wavelength range. A conversion unit (3) converts a part of the radiation of the specific wavelength range into electromagnetic radiation of another wavelength range. An adjustable transparent element (2) is arranged in a radiation direction of the source, between the source and the unit. The source includes a light emission material (1b) e.g. semiconductor material, provided between electrodes (1a, 1c), which are partially permeable for the radiation.

Description

  • It a light emitting device is specified.
  • The pamphlets DE 10 2005 046 450 and DE 10 2005 012 953 describe light emitting devices.
  • A to be solved task is a light-emitting Specify component that is particularly versatile.
  • At least an embodiment of the light-emitting device the component comprises a light source. The light source is suitable during operation of the device electromagnetic radiation of a first Wavelength range to emit. The first wavelength range comprises at least electromagnetic radiation of a wavelength. For example, this is electromagnetic radiation from the wavelength range of blue light.
  • At least an embodiment of the light-emitting device The light emitting device further comprises a conversion means. The conversion means is suitable, at least part of the electromagnetic Radiation of the first wavelength or the first wavelength range in electromagnetic radiation of a second wavelength or a second wavelength range. For example, the conversion agent is suitable, electromagnetic Radiation from the wavelength range of blue light into electromagnetic Radiation of the wavelength range of green, yellow and / or red light to convert. It is in particular also possible that the conversion means the electromagnetic Radiation of the first wavelength range into electromagnetic Radiation of a second, a third or further wavelength ranges converted. That is, the conversion agent can also be suitable, for example, in addition to electromagnetic radiation the wavelength range of yellow light is also electromagnetic Radiation of the wavelength range of red and / or green light to emit.
  • At least an embodiment of the light-emitting device The light emitting device further comprises an adjustable transparent Element. Under an adjustable transparent element is for example to understand a layer whose permeability to electromagnetic radiation, for example by applying a Changed voltage or changing an applied voltage can be. The adjustable transparent element is preferably in a radiation direction of the light source of the light emitting device arranged between this light source and the conversion means. That is, part of the light source in operation emitted electromagnetic radiation of the first wavelength range meets the adjustable transparent element. For the Case that this element is set to be for electromagnetic radiation of the first wavelength range is at least partially permeable, the electromagnetic Radiation of the first wavelength range through the adjustable transparent element and meet the conversion agent.
  • At least an embodiment of the light-emitting device For example, the light-emitting device includes a light source that operates electromagnetic radiation of a first wavelength range emitted, a conversion agent that is suitable, at least one Part of the electromagnetic radiation of the first wavelength range in electromagnetic radiation of a second wavelength range to convert, and an adjustable transparent element that in a direction of emission of the light source between the light source and the conversion means is arranged.
  • is the adjustable transparent element of the light emitting device adjusted so that it is for a part of the electromagnetic radiation permeable to the first wavelength range, so the light emitting device is preferably in operation suitable, mixed radiation of electromagnetic radiation of the first Wavelength range and electromagnetic radiation of the second wavelength range. About the Setting the permeability to electromagnetic Radiation of the first wavelength range, the proportion of electromagnetic radiation in the conversion agent enters, be discontinued. So that's the intensity the electromagnetic radiation of the second, converted wavelength range adjustable. About the setting of permeability the adjustable transparent element for electromagnetic Radiation of the first wavelength range can thus be the Ratio of electromagnetic radiation of the first and the second wavelength range in the mixed radiation, which is emitted from the light-emitting device set become.
  • In accordance with at least one embodiment of the light-emitting component, the light source comprises a first and a second electrode which are at least partially transparent to electromagnetic radiation of the first and the second wavelength range, respectively. The higher the transmittance of the first and the second electrode for electromagnetic radiation from these wavelength ranges, the higher the efficiency of the device, as in the operation of the device preferably at least part of this electromagnetic radiation passes through the transparent electrodes.
  • At least an embodiment of the light emitting device The light emitting device comprises a light emitting Material disposed between the first and the second electrode is. The light-emitting material is suitable, at least electromagnetic radiation of the first wavelength range to create. In addition, it is possible that the light-emitting material in the operation of the light-emitting Component of electromagnetic radiation of other wavelengths or wavelength ranges generated.
  • At least an embodiment of the light emitting device The light-emitting material of the light source comprises at least one of the following materials: organic material, inorganic Material, semiconductor material. That is, at the light source it may be, for example, an organic light emitting diode (OLED), a semiconductor light emitting diode (LED) or an electroluminescent light source (for example, an EL sheet) act. The light-emitting material is preferably for electromagnetic radiation at least the first and second wavelength ranges partially permeable. Since the light-emitting material preferably disposed between the first and second electrodes is, in turn, for the electromagnetic radiation at least the first and second wavelength ranges is partially permeable, so is the entire light source preferably for electromagnetic radiation of the first and the second wavelength range permeable.
  • At least an embodiment of the light-emitting device The conversion agent contains a luminescence conversion material, the electromagnetic radiation of the first wavelength range absorbs and emits electromagnetic radiation of the first wavelength range. In this case, the electromagnetic radiation of the second wavelength range preferably a longer wavelength on as the electromagnetic radiation of the second wavelength range. For example, particles of the luminescence conversion material mixed in a matrix material and thus form the conversion agent.
  • When Luminescence conversion materials may be organic materials, such as perylene phosphors are used. Further organic materials, for example, also for dye lasers be used in the corresponding wavelength range can be used as luminescence conversion materials.
  • About that In addition, luminescence conversion materials, their molecules are suitable an aromatic system and preferably conjugated double bonds contain. The backbone of these luminescence conversion materials is, for example, chromene, xanthene, coumarin, thioindole, and / or benzene educated.
  • Especially For example, the following materials are suitable: rhodamine 6G, DCM = 4- (dicyanomethylene) -2-methyl-6- (p -dimethylamino-styryl) -4H-pyran.
  • Especially if molecules with an abnormal Stokes shift are desired, the one reduced, or no overlap causes the areas of luminescence and the exciting radiation. Also suitable are so-called triplet emitters, since there is no overlap between exciting radiation and luminescence occurs. Another positive effect with triplet emitters is that absorption losses be avoided.
  • Farther Also, the following inorganic materials are suitable as luminescence conversion materials to be used: rare earth doped garnets, alkaline earth sulphides doped with rare earth metals, with metals of the rare earth doped thiogallates, with rare earth metals doped aluminates, rare earth doped orthosilicates, chlorosilicates doped with rare earth metals, with metals of the rare earth doped alkaline earth silicon nitrides, with metals rare earth doped oxynitrides and rare metals Ground doped aluminum oxynitrides.
  • At least an embodiment of the light-emitting device The adjustable transparent element comprises an adjustable transparent Material that between a third and a fourth electrode is arranged, wherein the third and the fourth electrode for electromagnetic radiation of the first and the second wavelength range at least partially permeable. The third and the fourth electrode For example, you can choose from the same material as the first and the second electrode manufactured and constructed identically be.
  • According to at least one embodiment of the light emitting device, the transmissivity of the adjustable transparent electromagnetic radiation material of the first wavelength range is dependent on a voltage applied to the third and fourth electrodes. That is, the third and fourth electrodes are electrically connected to the adjustably transparent material. The adjustable transparent material is selected such that its transmissivity is changed and / or adjusted by applying a voltage can be.
  • At least an embodiment of the light-emitting device contains the adjustable transparent material at least one of the following materials: Organic electrochromic compound, inorganic electrochromic compound, liquid crystal, cholesteric liquid crystal.
  • At least an embodiment of the light-emitting device is on the side facing away from the light source of the conversion agent a mirror layer attached, which is suitable electromagnetic Radiation of the first and the second wavelength range to reflect. That means both converted electromagnetic Radiation as well as unconverted electromagnetic radiation can be reflected by the mirror layer. The mirror layer is preferably arranged in such a way that it meets reflected electromagnetic radiation back into the conversion means becomes. The electromagnetic radiation can then, for example go through the conversion agent and from there into the adjustable transparent element penetrate.
  • At least an embodiment of the light-emitting device the device has a layer structure. This means The component is made up of different layers, one above the other are arranged to form a layer stack. The component points Preferably, the following layers: First points the device on the mirror layer, which is suitable electromagnetic Radiation of the first and the second wavelength range to reflect. With its reflective surface is the mirror layer facing the conversion means, for example applied directly to the reflective surface of the mirror layer can be. The conversion agent can also be used as a layer of be made of certain thickness.
  • On the conversion means, the adjustable transparent element is arranged. In this case, the adjustable transparent element is preferably arranged such that that it is on the side facing away from the mirror layer of the conversion agent is arranged.
  • On the side facing away from the conversion means of the adjustable transparent Elements is then preferably arranged the light source suitable is, electromagnetic radiation of the first wavelength range to generate during operation of the light emitting device. Preferably the layers of the light-emitting device along its surface normal arranged and have a cross-sectional area of the same shape and the same surface area, wherein the layer thicknesses can be different. The enumerated Layers can be directly on top of each other, the means to be arranged without intermediate layers. About that However, it is also possible that between individual Layers of the light emitting device are intermediate layers which may contain an adhesive, for example a mechanical connection between every two adjacent layers taught. The adhesive can also have a convey visual contact. That is, the glue is in its optical index of refraction to its two adjacent ones Adapted layers. This causes jumps in the refractive index reduced or completely between the adjacent layers prevented. Reflections on the layers, which leads to a reduction of can lead outcoupled light outputs are thereby reduced or prevented.
  • About that In addition, it is also possible that the device more Has layers. For example, the component can have several Include light sources and / or multiple conversion means, respectively may be different from each other light Emit wavelength.
  • At least an embodiment of the light-emitting device the second electrode and the third electrode are electrically conductive with each other connected. That is, the second electrode of the light source and the third electrode of the adjustable transparent element can be contacted together. For example, it is possible that the second electrode is placed directly on the third electrode or, that the second and the third electrode through a common electrode layer are formed.
  • At least an embodiment of the light-emitting device the conversion agent forms the fourth electrode of the device, the adjacent to the adjustable transparent material. The conversion agent For this purpose, an electrically conductive matrix material comprising a luminescence conversion material contains. For example, the matrix material may consist of Nano-particles of a transparent conductive oxide (TCO - transparent conductive oxides).
  • It is further indicated a lighting device. The illumination device comprises a light-emitting component as described in the preceding embodiments and the following exemplary embodiments. Furthermore, the illumination device comprises a first drive means, by means of which the permeability of the adjustable transparent element for electromagnetic radiation of the first wavelength range is adjustable. In the simplest case, this drive means is a controllable chip voltage source, with which the voltage which is applied to the electrodes of the adjustable transparent element, is adjustable.
  • At least an embodiment of the illumination device comprises the lighting device also has a second drive means, by means of the intensity emitted by the light source during operation electromagnetic radiation of the first wavelength range is adjustable. In the simplest case, it is the second Control means to a controllable voltage source. The higher For example, the voltage is chosen, the larger is the intensity emitted by the light source during operation electromagnetic radiation of the first wavelength range.
  • At least an embodiment of the illumination device is the The color of the light emitted during operation changes from yellow to yellow white adjustable to blue. This can for example be as follows be achieved: the light source is suitable, electromagnetic Radiation from the wavelength range of blue light to produce. The conversion agent is suitable, the light of the first Wavelength range - that is, that blue light - in electromagnetic radiation from the wavelength range to convert from yellow light. The thickness of the layer that the Conversion means forms, is chosen such that at fully transparent switched transparent adjustable Element, the light-emitting device emits light, wherein the yellow color impression predominates. For example, the same permanent intensity of the emitted from the light source Light can then be changed by permeability the adjustable transparent layer of completely transparent for blue light to impermeable for blue light the color impression of the of the lighting device emitted light from yellow to white - the is called mixed light of yellow and blue light - until to be varied to blue. For this finds as a driving means for the adjustable transparent element, for example, a controllable Voltage source use.
  • in the The following describes the light-emitting component described here as well as the illumination device described here based on embodiments and the associated figures explained in more detail.
  • 1 shows a schematic sectional view of a first embodiment of a lighting device described herein with an embodiment of a light emitting device described herein.
  • 2 shows a schematic sectional view of a second embodiment of a lighting device described herein with an embodiment of a light emitting device described herein.
  • In The embodiments and figures are the same or like-acting components each with the same reference numerals Mistake. The illustrated elements are not to scale On the contrary, individual elements can be better Understanding shown exaggeratedly large be.
  • The 1 1 shows a schematic sectional view of a first exemplary embodiment of a lighting device described here with an exemplary embodiment of a light-emitting component described here 20 , The light emitting device 20 includes a light source 1 , In the present case, the light source 1 designed as an organic light emitting diode. The light source 1 includes a first transparent electrode 1a and a second transparent electrode 1c , For example, the light source generates electromagnetic radiation from the wavelength range of blue light. The electromagnetic radiation generated by the light source is approximately halfway up, that is, in the direction of the first electrode 1a and the other half down, that is towards the second electrode 1c emitted. The viewer perceives the first part as blue emission.
  • The electrodes 1a . 1c the light source 1 are preferably at least partially transparent to visible light. They may consist of thin metal layers, electrically conductive oxides (TCO-Transparent Conductive Oxides), for example ITO (Indium Tin Oxide), a combination of thin metal layers and transparent conductive oxides or other transparent and electrically conductive materials.
  • The light source 1 moreover, one between the first electrode 1a and the second electrode 1c arranged light emitting material 1b , The light-emitting material may be constructed polymer or low molecular weight. That is, the light-emitting material contains, for example, at least one polymer. Preferably, the light-emitting material also contains at least one dopant, which is then admixed or polymerized, for example, to the polymer. The polymer and / or the dopant is thus a material which is provided for the emission of electromagnetic radiation. For example, the dopant may be a chromophore.
  • Alternatively, or in addition to a polymer, the light-emitting material may be a small molecule ("Small Molucules") and preferably at least one dopant, for example also a low molecular weight material included. In this case, the low molecular weight material and / or the dopant is an emitter material which is suitable for the emission of electromagnetic radiation. The light-emitting material 1b comprises one or more organic layers of a polymeric or low molecular weight material. Mixed layers or electronically doped layers can also be used in the light-emitting material 1b be included. Preferably, the light-emitting material emits 1b Narrow band in the blue or turquoise area of the spectrum of electromagnetic radiation.
  • The first electrode 1a facing surface of the light-emitting material 1a For example, it may have regular or irregular lateral structures-for example, roughening-which increase the efficiency of light extraction from the light-emitting material 1b improve. Also the second electrode 1c facing surface of the light-emitting material 1b may have such structures for improving the light extraction.
  • In a particularly advantageous embodiment, structures for improving the light extraction are located on the light-emitting material 1b opposite side of the first electrode 1a , Dielectric antireflection layers can also be used there in order to improve the light extraction. The dielectric antireflection layers can be used in addition or as an alternative to the structures for improving the light extraction.
  • Im in conjunction with the 1 described embodiment is the light source 1 designed as an organic light emitting diode. However, as already explained above, it is also possible that the light source 1 is formed by a semiconductor light-emitting diode or an electroluminescent film.
  • The second electrode 1c the light source 1 sleeps an adjustable transparent layer 2 on, which forms the adjustable transparent element of the device. The adjustable transparent layer 2 also includes two transparent electrodes - the third electrode 2a and the fourth electrode 2c , Between the third electrode 2a and the fourth electrode 2c is adjustable transparent material 2 B arranged.
  • The third electrode 2a and the fourth electrode 2c For example, as described above, the first electrode 1a and the second electrode 1c built up.
  • The permeability of the adjustable transparent material 2 B for electromagnetic radiation of the first wavelength range emitted by the light source 1 is generated from that at the electrodes of the adjustable transparent layer 2 applied voltage V1 dependent.
  • The adjustable transparent material 2 B may consist of organic or inorganic electrochromic compounds such as tungstates. These compounds absorb electromagnetic radiation from a certain wavelength range as a function of an applied electrical voltage and otherwise have a permeability of 70 to 80 percent.
  • Next, the adjustable transparent material 2 B consist of liquid crystal. For example, nematic and smectic liquid crystals can be used for this purpose. In this case, in order to achieve a voltage-dependent absorption, the arrangement of the liquid-crystalline materials between two polarization filters is necessary. This limits the voltage-dependent maximum possible permeability to about 30 percent.
  • Therefore, such materials are particularly preferred as adjustable transparent material 2 B used, which are transparent or reflective depending on the electric field. For this purpose, cholesteric liquid crystals are particularly suitable. Depending on the field, these liquid crystals reflect a specific section of the visible spectrum of electromagnetic radiation in half of the incident intensity. The other half is transmitted in a circularly polarized manner, with the reflected excerpt in the centroid wavelength and half-width being dependent on the pitch of the cholesteric helix and thus on the molecular constitution of the material. Such a behavior guarantees the maximum efficiency of the entire component with each set emission color - for example blue light - since no polarization filter has to be used.
  • One Example of cholesteric liquid crystals, for transmission or reflection of electromagnetic Radiation from the frequency range of blue light is particularly good suitable are cholesteryl carboxylates.
  • The adjustable transparent layer 2 closes on her of the light source 1 opposite side of the conversion agent 3 at. The conversion agent 3 includes, for example, a matrix material 3a and a luminescence conversion material 3b , which may be in particulate form, for example. Both matrix material 3a as well as luminescence conversion material 3b may be organic or inorganic materials.
  • When Matrix materials are in particular the following materials: Silicone resins, epoxy resins, polyurethanes, polycarbonates.
  • In particular, nanocrystalline materials which can be prepared by sol-gel processes are also suitable as matrix materials. Such materials are for example in the document DE 10 2005 012 953 whose disclosure content with respect to nano-kirstalline materials and their production is hereby expressly incorporated by reference.
  • The matrix material can also be used as material for the electrodes, for example for the fourth electrode 2c serve. It is also possible that the fourth electrode 2c is formed by the conversion means. In order for the matrix material to serve as the material for the electrode, the matrix material must be electrically conductive. It is such an electrically conductive matrix material that can form a current spreading layer or an electrode, for example, in the document DE 10 2005 046 450 whose disclosure content with respect to the electrically conductive matrix materials and their production is hereby expressly incorporated by reference.
  • The absorption band of the luminescence conversion material preferably coincides 3b at least partially with the emission of the light source 1 , so that a particularly high conversion efficiency is achieved. For the conversion of blue light into yellow light, the following luminescence conversion materials are particularly suitable: YAG: Ce, TAG: Ce, Lumogen Yellow from BASF AG.
  • In the conversion agent, one or more luminescence conversion materials can be used which emit electromagnetic radiation of the same or different wavelengths. The particles 3b Luminescence conversion materials can be applied to a carrier film and then through the matrix material 3a be fixed or in a matrix material 3a are embedded, which is then applied to a carrier film and from which films or plates can be made. The conversion agent 3 can be produced by injection molding, extrusion, rolling, film drawing or other suitable methods. The curing of the conversion agent 3 can be thermal, by irradiation with light or by chemical reaction. The attachment of the cut to size of the appropriate slides or plates of the conversion agent 3 on the adjustable transparent layer 2 Can be done by lamination, gluing or mechanically - for example, by clamping. It is also possible that several films or plates of different or the same conversion means are used one above the other. However, the conversion agent or the conversion agent can also be applied in the liquid phase, for example by dip coating, knife coating, screen printing, electrophoretic deposition or spraying.
  • The layer thickness of the conversion agent, which is the color locus of the light-emitting component with completely transparent switched layer 2 determined, can be chosen so that the device emits in this state clearly yellow. By varying the voltage V1 applied to the adjustably transparent layer 2 it is then possible to produce light whose color can be changed steplessly from yellow over white to blue. In addition, the regulation allows the voltage V2, which at the light source 1 is present, the adjustment of the intensity of this mixed light.
  • Overall, thus a lighting device is realized, which is a light emitting device 20 and a first drive means V1 and a second drive means V2. The lighting device can be used as a lamp for general lighting, wherein the color temperature of the light generated by the lighting device can be varied as desired from cold / white to warm / white.
  • Part of the light source 1 generated electromagnetic radiation 11a is directly through the first electrode 1a from the light emitting device 20 decoupled. For example, a viewer perceives this proportion as a blue light. A second portion passes in the direction of the conversion agent 3 through the adjustable transparent layer 2 , This proportion can - as on the beam 11b clarifies - the conversion layer penetrate without being absorbed. The beam is then at the mirror layer 4 reflects and exits the light emitting device. Furthermore, it is possible that the radiation, as in the example of the beam 11c illustrates, is converted and the light-emitting device 20 for example, as a yellow light leaves. Overall, mixed light is generated in this way. Will now the permeability of the adjustable transparent layer 2 for from the light source 1 gradually reduced, for example, gets less blue light in the conversion agent 3 , The resulting mixed color of the mixed light will thus appear bluer. About the regulation of the light source 1 applied voltage V2 can be the brightness, via the regulation of the adjustable transparent layer 2 adjacent voltage V1, the color locus of the component can be set regardless of the brightness.
  • Emits the light source 1 and / or the conversion agent 3 Light of other colors than blue or yellow, other color gradients can be realized.
  • On the adjustable transparent layer 2 opposite side of the conversion layer 3 is a mirror layer 4 arranged. This mirror layer 4 serves as a broadband reflecting mirror. It consists for example of a metal, preferably of a highly reflective metal such as aluminum or silver. Furthermore, it is possible for the mirror layer to comprise dielectric layers which form an interference or a Bragg mirror.
  • All layers of the light emitting device 20 can be deposited directly on each other or prefabricated on transparent substrates. The substrates can be matched in their refractive index, so that no reflection losses occur between the individual layers. Such pre-fabricated on transparent substrates layers can be mechanically connected to each other by means of a refractive index matched adhesive or a gel.
  • The second electrode 1a the light source 1 as well as the third electrode 2a the adjustable transparent layer 2 may be electrically connected to each other or formed by a single, common electrode.
  • The 2 shows a second embodiment of a lighting device described here. In this embodiment, the light-emitting device is 20 on a carrier 22 arranged over which the device can be contacted, for example, electrically. Furthermore, the illumination device comprises an encapsulation 21 which protects the light emitting device against chemical and mechanical damage.
  • The light-emitting component described here is characterized in particular by the fact that the color and intensity of the emitted light can be adjusted independently of one another. The degree of freedom remains one on the service life of the light emitting device 20 optimized pulsed control received. That is, to control the light source 1 a pulsed voltage V2 can be used which ensures a particularly long service life of the light-emitting component. The independent control of the brightness and the color location of the emitted mixed light via two controllable voltage sources is a particularly simple and inexpensive way to produce mixed light. Furthermore, the light-emitting component described here is distinguished not only by the simplified electrical control but also by a particularly simple layer structure.
  • The here indicated invention is not by the description limited to the embodiments. Much more For example, the invention includes every novel feature as well as every combination of features, in particular any combination of features in the patent claims, even if this feature or this combination itself is not explicitly stated in the claims or embodiments is given.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • - DE 102005046450 [0002, 0052]
    • - DE 102005012953 [0002, 0051]

Claims (15)

  1. Light-emitting component ( 20 ) with - a light source ( 1 ), which emits in operation electromagnetic radiation of a first wavelength range, - a conversion means ( 3 ), which is suitable for converting at least part of the electromagnetic radiation of the first wavelength range into electromagnetic radiation of a second wavelength range, and - an adjustable transparent element ( 2 ), which in a radiation direction of the light source ( 1 ) between the light source ( 1 ) and the conversion means ( 3 ) is arranged.
  2. Light-emitting component according to the preceding claim, in which the light source ( 1 ) a light-emitting material ( 1b ), that between a first ( 1a ) and a second electrode ( 1c ), the first ( 1a ) and the second electrode ( 1c ) are at least partially transmissive to electromagnetic radiation of the first and second wavelength ranges.
  3. Light-emitting component according to at least one of the preceding claims, in which the light-emitting material ( 1b ) of the light source ( 1 ) comprises at least one of the following materials: organic material, inorganic material, semiconductor material.
  4. Light-emitting component according to at least one of the preceding claims, in which the conversion means ( 3 ) a luminescence conversion material ( 3b ) which absorbs electromagnetic radiation of the first wavelength range and emits electromagnetic radiation of the second wavelength range.
  5. Light-emitting component according to at least one of the preceding claims, wherein the adjustable transparent element ( 2 ) an adjustable transparent material ( 2 B ), that between a third ( 2a ) and a fourth electrode ( 2c ), the third ( 2a ) and the fourth electrode ( 2c ) are at least partially transmissive to electromagnetic radiation of the first and second wavelength ranges.
  6. Light-emitting component according to the preceding claim, in which the permeability of the adjustably transparent material ( 2 B ) for electromagnetic radiation of the first wavelength range depends on a voltage (V1) applied to the third 2a ) and fourth electrode ( 2c ) is created.
  7. A light emitting device according to claims 5 or 6, wherein the adjustably transparent material ( 2 B ) contains at least one of the following materials: organic electrochromic compound, inorganic electrochromic compound, liquid crystal, cholesteric liquid crystal.
  8. Light-emitting component according to at least one of the preceding claims, in which the light source ( 1 ) facing away from the conversion agent ( 3 ) a mirror layer ( 4 ) capable of reflecting electromagnetic radiation of the first and second wavelength ranges.
  9. Light-emitting component according to at least one of the preceding claims, in which the component has a layer structure with - the mirror layer ( 4 ) to which the conversion agent ( 3 ) is applied, - the adjustable transparent element ( 2 ), which on the mirror layer ( 4 ) facing away from the conversion agent ( 3 ), and - the light source ( 1 ) based on the conversion product ( 3 ) facing away from the adjustable transparent element ( 2 ) is arranged.
  10. Light-emitting component according to at least one of the preceding claims, in which the second electrode ( 1c ) and the third electrode ( 2a ) are electrically connected to each other.
  11. Light-emitting component according to the preceding claim, in which the second electrode ( 1c ) directly on the third electrode ( 2a ) is arranged.
  12. Light-emitting component according to at least one of the preceding claims, in which the conversion means ( 3 ) the fourth electrode ( 2c ).
  13. Lighting device with a light-emitting component ( 20 ) according to at least one of the preceding claims, and - a first drive means (V1) by means of the permeability of the adjustable transparent element ( 2 ) is adjustable for electromagnetic radiation of the first wavelength range.
  14. Lighting device according to the preceding claim, with a second drive means (V2) by means of which the intensity of the light source ( 1 ) emitted during operation electromagnetic radiation of the first wavelength range is adjustable.
  15. Lighting device according to claim 13 or claim 14, wherein the color of the light emitted during operation infinitely adjustable from yellow over white to blue is.
DE102007022090A 2007-05-11 2007-05-11 Light emitting component for lamp, has light source e.g. organic LED, emitting electromagnetic radiation of specific wavelength range, and adjustable transparent element arranged between light source and conversion unit Withdrawn DE102007022090A1 (en)

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DE102007022090A DE102007022090A1 (en) 2007-05-11 2007-05-11 Light emitting component for lamp, has light source e.g. organic LED, emitting electromagnetic radiation of specific wavelength range, and adjustable transparent element arranged between light source and conversion unit

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WO2011033431A1 (en) * 2009-09-17 2011-03-24 Koninklijke Philips Electronics N.V. Lighting device with off-state white appearance
WO2011158144A1 (en) * 2010-06-18 2011-12-22 Koninklijke Philips Electronics N.V. Light generating method
WO2012011936A3 (en) * 2010-07-23 2012-05-03 Cree, Inc. Light transmission control for masking appearance of solid state light sources
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US10164158B2 (en) 2003-09-18 2018-12-25 Cree, Inc. Molded chip fabrication method and apparatus
US9159888B2 (en) 2007-01-22 2015-10-13 Cree, Inc. Wafer level phosphor coating method and devices fabricated utilizing method
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US9041285B2 (en) 2007-12-14 2015-05-26 Cree, Inc. Phosphor distribution in LED lamps using centrifugal force
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WO2011033431A1 (en) * 2009-09-17 2011-03-24 Koninklijke Philips Electronics N.V. Lighting device with off-state white appearance
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DE102012205413A1 (en) * 2012-04-03 2013-10-10 Osram Opto Semiconductors Gmbh Organic light emitting component e.g. organic LED installed on e.g. window for light emitting application, has liquid volume section to which electric field is applied for controlling wetting of electrical insulating layer with oil
US9741781B2 (en) 2013-05-22 2017-08-22 Osram Oled Gmbh Optoelectronic component with adjustable light emission and method for producing the same
WO2014187853A1 (en) 2013-05-22 2014-11-27 Osram Oled Gmbh Optoelectronic component and method for producing an optoelectronic component
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DE102013106944A1 (en) 2013-07-02 2015-01-08 Osram Oled Gmbh An optoelectronic component device, method for producing an optoelectronic component device and method for operating an optoelectronic component device
WO2015000671A1 (en) 2013-07-02 2015-01-08 Osram Oled Gmbh Optoelectronic component device, method for producing an optoelectronic component device, and method for operating an optoelectronic component device
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WO2015104326A1 (en) * 2014-01-10 2015-07-16 Osram Oled Gmbh Optoelectronic component
WO2016102396A1 (en) 2014-12-23 2016-06-30 Osram Oled Gmbh Method for operating a light-emitting assembly
DE102014119541A1 (en) 2014-12-23 2016-06-23 Osram Oled Gmbh Method for operating a light-emitting assembly

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