Classifications

• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
  • H10K59/30—Devices specially adapted for multicolour light emission
  • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
  • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
  • H01L33/48—Semiconductor devices having potential barriers 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 semiconductor body packages
  • H01L33/50—Wavelength conversion elements
  • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
  • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
  • H01L33/48—Semiconductor devices having potential barriers 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 semiconductor body packages
  • H01L33/50—Wavelength conversion elements
  • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
  • H01L33/502—Wavelength conversion materials
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B33/00—Electroluminescent light sources
  • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
  • H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K50/00—Organic light-emitting devices
  • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
  • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
  • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K2102/00—Constructional details relating to the organic devices covered by this subclass

Definitions

• the present invention relates to a light-emitting component with a wavelength converter, in particular for a surface illumination source, and an associated production method.
• Wavelength converters are used in particular for areal sources, such as organic light-emitting diodes (OLEDs).
• OLEDs organic light-emitting diodes
• Appl. Phys. Lett. 80, 3470 - 3472 (2002) describes an electroluminescent device in which a mixture of organic and inorganic
• Fluorescence converters and a polymeric matrix material is applied to the back of a substrate.
• the material particles or molecules which are intended as converter material are dispersed or dissolved in a matrix of a liquid polymeric organic material and then applied as a thin layer on the back of the substrate. It is necessary in this type of manufacture that the matrix material be suitable for the formation of a layer or a thin film; therefore, a polymeric organic material is used here.
• the object of the present invention is to specify how surface illumination sources can be provided with wavelength converters in a simplified manner, without the need to use complex conventional production processes, such as the use of doctor blades, screen printing or gluing.
• it is provided to use a matrix material and a converter material in a conversion layer provided for wavelength conversion, both of which are vaporisable under high vacuum and may in particular comprise low molecular weight organic compounds.
• Vaporable in a high vacuum may mean, for example, that the matrix material and the converter material can be applied by evaporation in a high vacuum to a surface intended for radiation emission without being damaged.
• low molecular weight organic materials are to be understood as meaning the group of organic molecules which are not constructed in a repetitive manner, ie these molecules do not consist of n-repeating units, unlike polymers, for example
• materials are also to be understood by the term “low molecular weight organic materials”, which belong to the group of oligomers, that is to say, repetitively constructed molecules with n.ltoreq.10
• materials are also included under the term “low molecular weight organic materials ", which belong to the group of dendrimers, ie molecules with outward increasing branching.
• organic matrix material are in particular aromatic amines, carbazoles or aromatic
• inorganic vaporizable systems can also be used, for example at least one of the following materials: MoO 3 , ZnS, MgF 2 , Ta 2 O 5 , TiO, Al 2 O 3 . That is, the matrix material may consist of one of these materials or contain at least one of these materials.
• Suitable converter materials which are vaporizable under high vacuum may be selected from a group comprising perylenes, benzopyrene, coumarins, rhodamines and azo, terrylene, quaterrylene, naphthalimide, cyanine, xanthene, oxazine, anthracene, naphthacene -, anthraquinone and thiazine dyes. That is, the converter material may consist of at least one of these substances or may contain at least one of these substances.
• Such a conversion layer is used in particular for areally radiating, conversion-based electroluminescent components, such as, for example, organic light-emitting diodes, which in turn may in turn be formed from low-molecular-weight organic compounds.
• conversion-based electroluminescent components such as, for example, organic light-emitting diodes, which in turn may in turn be formed from low-molecular-weight organic compounds.
• the low molecular weight organic compounds are sublimable in a high vacuum and can therefore be applied in the same vapor deposition from a high vacuum, with which the radiation-generating layers of the device are applied.
• the manufacturing process can be significantly simplified.
• the invention can be used for light-emitting components, in particular for planar electroluminescent components, which are made of inorganic or organic Materials are constructed.
• Organic light-intersecting devices such as organic light-emitting diodes, may include low molecular weight organic layers for light generation and charge transport, but may also be constructed of polymeric organic materials. The number of layers provided for radiation generation and current injection is not limited in this case.
• the electrodes metals or semiconducting materials, inorganic as well as organic, may be used.
• at least one of the electrodes is formed in the form of a transparent layer for the generated radiation and provided indirectly or directly with the conversion layer.
• the converter material acts as a fluorescence converter in the conversion layer and can be present in different concentrations in the matrix material for this purpose; its absorption band should at least partially overlap with the wavelength range of the emitted radiation. It is also possible to use a plurality of converter materials in the conversion layer. The converter materials can be provided for the same or different emission wavelengths. The production takes place for example by simultaneous evaporation (co-evaporation) from several sources of material.
• the matrix material can be transparent for all relevant wavelengths; but it can also be made of a material that absorbs the emitted radiation, whereupon the recorded radiation energy is delivered via Förster- or Dexter transfer to the converter material. Also on the a plurality of conversion layers are described above one another or, using shadow masks during vapor deposition, applied side by side. The color location of the conversion component can be influenced by the layer thickness of the deposited conversion layer, the concentration of the emitter molecules in the matrix and the area ratios between conversion layers applied side by side.
• a method for producing a light-emitting component with wavelength converter is also specified, in which a conversion layer is vapor-deposited onto a surface provided for radiation emission.
• a device described here can be produced. All features disclosed in connection with the component are therefore also disclosed for the method.
• FIG. 1 shows an embodiment of a top emitter LED with electrically conductive substrate in cross section.
• FIG. 2 shows an embodiment of a bottom emitter LED with electrically conductive substrate in cross section. - S -
• FIG. 3 shows an embodiment of a top emitter OLED without a backside electrode in cross section.
• FIG. 4 shows an exemplary embodiment of a bottom emitter OLED without a backside electrode in cross section.
• FIG. 1 shows a first exemplary embodiment in a schematic cross section.
• a first electrode layer 1 provided as a backside electrode is applied to a rear side of an electrically conductive substrate 2.
• a layer structure 3 which may comprise known per se layers of a light emitting device, the details of which are not essential to the invention and therefore not shown.
• the layer structure 3 comprises in particular the active layers intended for generating radiation. In addition, boundary layers or sheath layers provided for current injection may be provided.
• a second electrode layer 4 which is applied over the entire surface in this embodiment and consists of a material which is transparent to the radiation to be emitted.
• the conversion layer 5 is applied, which comprises a matrix material and a converter material, which are preferably both low molecular weight organic compounds. The radiation emission takes place over the entire area in the direction shown by the arrow.
• FIG. 2 shows a schematic cross section corresponding to FIG. 1 of a further exemplary embodiment, in which the conversion layer 5 is on the underside or rear side of the component, that is to say on the rear side Surface of the first electrode layer 1, is applied.
• the substrate 2 and the first electrode layer 1 are formed of a material transparent to the radiation to be emitted, and the light emission is in the direction indicated by the arrow.
• the electrode layer which is provided on the side intended for the radiation, but may for example also be opaque and ring-shaped or frame-shaped surrounding the emission surface.
• the conversion layer may be applied to the light exit surface within the electrode layer on a surface of a layer structure or directly on the substrate material.
• a particular advantage of the invention results in embodiments in which the light-emitting component is a low molecular weight organic light-emitting diode, so that both the electroluminescent layers of the light-emitting diode and the components of the conversion layer can be vapor-deposited in the same system.
• the conversion layer 5 can be produced immediately after the application of the transparent cover electrode, the second electrode layer 4. So there are no additional processes for coating with the converter material (for example, doctoring, screen printing, gluing) more necessary.
• the first electrode layer 1 is arranged in this embodiment on the front side of the substrate 2 between the substrate 2 and the layer structure 3.
• the conversion layer 5 can even be deposited simultaneously with the production of the organic layer structure 3 on the back side of the substrate 2. Also in this embodiment, therefore, no additional processes for coating with the converter material (for example, doctor blades, screen printing, gluing) are more necessary.

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• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Manufacturing & Machinery (AREA)
• Computer Hardware Design (AREA)
• Power Engineering (AREA)
• Electroluminescent Light Sources (AREA)
• Physical Vapour Deposition (AREA)

Applications Claiming Priority (3)

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Citations (2)

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• 2007
  • 2007-11-07 DE DE102007053069A patent/DE102007053069A1/de not_active Withdrawn
• 2008
  • 2008-09-15 KR KR1020107009183A patent/KR20100076995A/ko not_active Application Discontinuation
  • 2008-09-15 EP EP08801332A patent/EP2193558A1/de not_active Withdrawn
  • 2008-09-15 CN CN200880109080A patent/CN101809777A/zh active Pending
  • 2008-09-15 WO PCT/DE2008/001540 patent/WO2009039833A1/de active Application Filing
  • 2008-09-15 JP JP2010526160A patent/JP2010541138A/ja active Pending
  • 2008-09-15 US US12/680,610 patent/US8487329B2/en active Active
  • 2008-09-19 TW TW097135990A patent/TWI420720B/zh not_active IP Right Cessation

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