EP1563551A2 - Organische elektrolumineszente lichtquelle mit antireflexionsschicht - Google Patents

Organische elektrolumineszente lichtquelle mit antireflexionsschicht

Info

Publication number
EP1563551A2
EP1563551A2 EP03758561A EP03758561A EP1563551A2 EP 1563551 A2 EP1563551 A2 EP 1563551A2 EP 03758561 A EP03758561 A EP 03758561A EP 03758561 A EP03758561 A EP 03758561A EP 1563551 A2 EP1563551 A2 EP 1563551A2
Authority
EP
European Patent Office
Prior art keywords
organic electroluminescent
light source
layer
organic
electroluminescent light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03758561A
Other languages
German (de)
English (en)
French (fr)
Inventor
Horst Philips Int. Pro. & Standards GmbH GREINER
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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 Philips Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP1563551A2 publication Critical patent/EP1563551A2/de
Withdrawn legal-status Critical Current

Links

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
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • 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
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices

Definitions

  • the invention relates to an organic electroluminescent light source, in particular an organic electroluminescent diode for illuminated displays, lights, solid-state image intensifiers or screens.
  • the organic electroluminescent light source comprises a transparent front panel, a front electrode component (member), a counter electrode component, an organic electroluminescent component (member) between the front electrode component and the counter electrode component and an antireflection layer made of a pore material.
  • An electroluminescent light source is characterized in that it emits light when an electrical voltage is applied under current flow.
  • the following light-generating processes take place: If electrons are injected into a p-doped semiconductor, light can be generated if the electron recombines with the hole while emitting radiation. Conversely, light can be generated in a hole injection into n-doped semiconductor material if the holes recombine with the electrons while emitting light.
  • Prior art LEDs are generally inorganic semiconductor diodes, that is to say diodes for their construction, inorganic semiconductors such as doped zinc sulfide, silicon, germanium or III-N semiconductors, e.g. B. InP, GaAs, GaAlAs, GaP or Ga ⁇ can be used with appropriate doping. Punctiform display elements can be produced on the basis of such substances. Large-scale arrangements are not possible.
  • Electroluminescent light sources with luminous layers that come from organic materials are built, light sources from inorganic materials are clearly superior in some properties.
  • One advantage is their easy formability and high elasticity, which enables novel applications for lighting, illuminated displays and screens.
  • These luminous layers can easily be produced as large, flat and very thin layers, for which the use of materials is also low. They are also characterized by a remarkably high brightness with a low control voltage.
  • the luminous efficiency of an electroluminescent light source is determined by the quantum efficiency of all light-generating processes.
  • the internal quantum yield is obtained from the percentage of the injected charge carriers that recombine under radiation emission.
  • the outer quantum yield results from the inner quantum yield, multiplied by the percentage of the light actually emerging from the semiconductor.
  • One of the loss factors is the low light output, which is caused by the complex layer structure of the electroluminescent light sources from several layers with different refractive indices.
  • the different optical refractive indices of the materials in organic electroluminescent light sources have the effect that the light generated in the active layer of the light source due to the high refractive index of the organic electroluminescent materials is totally reflected at the exit and is only coupled out to a few percent in the exterior, typically air, with a lower refractive index. For a given electric current that flows through the electroluminescent light source to generate the light, the brightness of the light source is limited.
  • EP 1153739 discloses an electroluminescent optical component whose substrate contains a functional layer, an airgel layer and an intermediate layer between the functional layer and the airgel layer.
  • the airgel can be a silica gel with a refractive index between 1.008 and 1.3.
  • the object of the present invention is to provide an electroluminescent light source suitable for mass production for different material systems, which is capable of coupling out as much light as possible and which is resistant to environmental influences.
  • an organic electroluminescent light source with a front panel, a front electrode component, a counter electrode component, an organic electroluminescent component between the front electrode component and the counter electrode component and an antireflection layer made of an organic polymeric material that contains mesopores, between the front panel and the front electrode component solved.
  • the pore size of the mesopores is in the range of 50 to 100 nm. This pore size guarantees that the evanescent waves present at the interface between the front electrode components and the anti-reflective layer are different from those in the electroluminescent component trapped photons originate, can be effectively coupled into the anti-reflection layer.
  • the mesoporous antireflection layer has a low effective refractive index so that the coupling out of the light from the mesoporous antireflection layer into the subsequent front panel is advantageously improved.
  • the anti-reflection layer according to the invention fulfills the requirement for sufficient optical transparency, long-term stability against atmospheres and against temperature changes. According to a preferred embodiment of the invention, the
  • the organic polymeric material of the anti-reflection layer is a hydrophobic polymer.
  • Antireflection layers made of a hydrophobic organic polymer and with closed-cell pores prevent the absorption of oxygen and water in the organic electroluminescent light source. In doing so, they prevent the oxidation of the organic semiconductor layers and the electrodes made of base metal, which reduces the lifespan of the organic electroluminescent light sources.
  • the pores can also
  • the pores in the antireflection layer are preferably produced by means of a porogen.
  • the light-emitting surfaces of the organic electroluminescent light source are essentially two-dimensionally emitting surfaces.
  • Fig. 1 shows the schematic structure of an organic electroluminescent light source according to the invention.
  • An organic electroluminescent light source according to the invention is generally constructed as follows:
  • the core is an organic electroluminescent component between a positive electrode as front electrode components and a negative electrode as counter electrode components, it being possible for one or both electrode components to be transparent and / or segmented.
  • the organic electroluminescent light source is equipped with a front electrode as front electrode components and a negative electrode as counter electrode components, it being possible for one or both electrode components to be transparent and / or segmented.
  • the organic electroluminescent light source is equipped with a front electrode as front electrode components and a negative electrode as counter electrode components, it being possible for one or both electrode components to be transparent and / or segmented.
  • the organic electroluminescent light source is equipped with a front
  • Panel and usually also a rear panel.
  • an anti-reflection layer made of a porous, polymeric organic material that contains mesopores is arranged between the front electrode component and the front panel.
  • organic electroluminescent component can be divided into individual layers with different functions such as hole-injecting layer, hole-transporting layer, light-emitting layer, electron-transporting layer, electron-injecting layer.
  • one or more electron injection and / or electron transport layers can be arranged between the electroluminescent layer and the positive electrode.
  • one or more hole injection and / or hole transport layers can be arranged between the electroluminescent layer and the negative electrode.
  • a complete organic electroluminescent light source can further include contacts, cladding, and encapsulation.
  • Such a light source typically consists of a layer composite of individual layers applied one above the other and partially next to one another. All layer structures and materials known to those skilled in the art for these layers are suitable for the structure.
  • This layered composite can be built from the front panel made of glass, quartz, ceramic, synthetic resin or a transparent, flexible plastic film.
  • Preferred materials for the production of the front panel are glass and plastic.
  • the special advantages of glass are that it is chemically and also photochemically inert, is optically isotropic, is temperature-resistant, is mechanically stable and also has a hard surface. However, glass has a relatively high density, is brittle and therefore very sensitive to breakage.
  • Plastics z.
  • polyimides, polyethylene terephthalates and polytretrafluoroethylenes have a lower density and are elastic and unbreakable.
  • the negative electrode supplies electrons which combine with the holes in the organic electroluminescent layer to form excitons and emit photons during recombination.
  • At least one of the electrode components should be transparent or at least translucent.
  • the positive electrode is the front electrode and is made of a non-stoichiometric or doped tin oxide, e.g. B. ITO, or a metal with a high work function, e.g. B. made of gold or silver. These electrode materials can be easily manufactured as transparent layers. ITO is particularly suitable due to the fact that it has good electrical conductivity and is transparent.
  • a layer made of a conductive polyaniline or poly-3,4-ethylene dioxythiophene can be used alone or together with an ITO layer as a transparent positive electrode.
  • the negative electrode that injects electrons into the organic electroluminescent layer is said to have a low work function.
  • Suitable materials for the negative electrode are e.g. B. indium, aluminum, calcium, barium or magnesium. If the negative electrode is made from the reactive barium, it is advisable to cover this electrode layer with a further protective layer made of an epoxy resin or an inert metal. The advantage of these layers is that they do not reflect as strongly as metallic layers.
  • Aromatic, conjugated conductor polymers of the poly (para-phenylene) type (LPPPs), which are chemically similar to oligo- or polyphenylene, have proven to be particularly suitable as organic electroluminescent components for use in organic electroluminescent light sources.
  • LPPPs have a continuous chain of conjugated double bonds.
  • Z are particularly suitable.
  • Such conductor polymers are easy to process and result in layers with an amorphous structure.
  • suitable polyphenylene vinyls are poly (2-methyl-5- (n-dodecyl) -p-phenylene vinylene, poly (2-methyl-5-
  • Components that contain two different electroluminescent layers function significantly better than organic electroluminescent light sources with a single electroluminescent layer.
  • a layer effectively transports holes, e.g. B. PPV, a layer effectively transports electrons, e.g. B. oxadiazole. This makes it easier to recombine holes and electrons.
  • Polyethylene dioxythiophene PEDOT and polyethylene dioxythiophene polystyrene sulfonate PEDOT-SS are particularly advantageous for the transport of the positive charge carriers.
  • 4,4 ', 4 "-Tris [N- (l-naphthyl) -N ⁇ phenylamino] -triphenylamine together with hydroxyquinoline-aluminum-III salt Alq 3 is also particularly advantageous for the transport of the positive charge carriers as emission Occasionally, a distinction is made in the literature regarding organic electroluminescent optical components between polyleds and OLEDs.
  • OLEDs contain an organic electroluminescent component based on vapor-deposited low-molecular organic compounds.
  • Polyleds contain an organic electroluminescent component based on long-chain organic electroluminescent polymers applied by dipping, spin coating or printing.
  • the organic electroluminescent light source contains an antireflection layer made of an organic polymeric material into which mesoporous, preferably uniformly dispersed, pores are introduced.
  • an antireflection layer made of an organic polymeric material into which mesoporous, preferably uniformly dispersed, pores are introduced.
  • Invention can organic polymers, copolymers and polymer mixtures, such as.
  • poly (meth) acrylic acid derivatives, polystyrene derivatives, polyesters, polyamides or polyethylenes can also be used.
  • Organic polymeric materials in the sense of the present invention are in particular also synthetic hydrophobic and non-degrading polymers, copolymers and polymer mixtures of polymethyl methacrylates, polycarbonates, polypropylene oxides, polyamides, polyvinylidene fluorides, polybutylenes and polyacrylonitriles.
  • polymers can e.g. B. generated by radical, ionic or thermal polymerization from the monomers.
  • monomers are not used as starting compounds, but oligomeric or polymeric compounds.
  • the term monomers therefore also includes oligomeric or low-polymer compounds which are polymerizable and which can be used as starting compounds for the polymerization of organic materials.
  • the monomers to be used accordingly are known to the person skilled in the art in the field of organic polymers.
  • Porous materials can be characterized by their pore size.
  • micropores very small pores with a diameter ⁇ 2 nm are called micropores, while very large pores with a diameter> 50 nm are called macropores
  • mesopores Intermediate diameter pores with a diameter between 2 and 50 nm are called mesopores and form an aspect of the present invention.
  • Mesoporous organic and hydrophobic materials which exclusively contain uniformly dispersed closed-cell mesopores are preferably used for the layers according to the invention, although porous materials with proportions of macropores can also be suitable.
  • a network of open pores can also be suitable.
  • the pore diameter can be determined by gas adsorption and electron microscopy.
  • the mesopores should have a diameter with a median value of at least 1 nm and at most 50 m, preferably at least 30 nm and at most 50 nm.
  • the size of the pores influences the transparency of the coating.
  • Particularly transparent coatings are achieved with small mesopores, which for example have a diameter of at most 100 nm, more preferably 50 nm.
  • the refractive index of the antireflection layer is determined by the size and number of pores present.
  • the antireflection layer additionally has macropores, preferably also macropores, in an amount in the same order of magnitude as that of the mesopores.
  • the antireflection layer can be produced by a method for producing porous organic polymers with defined porosity using a pore-forming agent.
  • porogen an inert material to the polymer, which is often referred to as porogen. After the polymerization, the porogen is dissolved out of the polymer. This creates voids in the polymer.
  • the material of the porogen can be selected from natural and synthetic materials that either retain their shape during the polymerization or form a stable phase of their own and can then be removed again.
  • porogens that are water-soluble or that can be dissolved in solvents that do not attack the polymer are suitable.
  • Porogens suitable for the invention can be water soluble Salts such as sodium chloride, potassium chloride, sodium fluoride, potassium fluoride, sodium iodide, sodium nitrate, sodium sulfate, sodium iodate, and mixtures thereof, other water-soluble chemical compounds such as sodium hydroxide, and various water-soluble sugars such as saccharin, glucose, fructose.
  • the water-soluble porogen can be in any desired geometric
  • Form can be used, for example in the form of spheres, fibers, platelets, in the usual regular and irregular forms of crystals.
  • the porogen may also be another organic polymer that is incompatible with the first organic polymer that forms the anti-reflective layer and forms an incompatible, dispersed liquid phase with it.
  • the morphology and porosity of the anti-reflective layer can be controlled by the ratio of incompatible porogen to the first organic polymer.
  • a high proportion of porogen creates an open spongy structure, a medium proportion a network of more or less linked pores. With a small proportion of porogen, a closed-cell defined pore structure is obtained.
  • the coating solution for producing the antireflection layer usually contains the organic polymer or a precursor of the polymer and the porogen in a solvent.
  • the coating solution typically contains 30 to 80% by volume of porogen.
  • the first polymer typically contains at least 50% of the porogen, so that an open-cell network of pores forms after the polymerization
  • the person skilled in the art is able to combine the various polymers or monomers accordingly, optionally to choose a suitable free-radical initiator or initiator and thus to put together a monomer solution.
  • the duration and temperature of the polymerization are reduced to the usual rules matched each monomer solution.
  • the coating solution is applied to the inside of the front panel by known spin coating methods, or by simply immersing the entire sample. After the polymerization step has ended, the resulting solution
  • Coating which consists of the organic matrix polymer and the porogen, detached the material of the porogen.
  • the solution process can also include evaporation, solvent extraction or leaching, depending on the type of porogen selected. After further washing steps to remove the washing solution, the mesoporous organic polymeric anti-reflection layer is obtained.
  • the embodiment of the organic electroluminescent light source shown in FIG. 1 with an antireflection layer made of a mesoporous organic polymeric material essentially consists of a front panel 1, to which a transparent and conductive ITO layer 8 with contact connections 3 is applied as a front electrode.
  • An electroluminescent layer 7 made of PDOT and a second electroluminescent layer 6 made of PPV and a counter electrode made of aluminum 5 lie on the ITO layer.
  • the structure is completed by a rear rear panel 4.
  • the organic electroluminescent light source further comprises the mesoporous antireflection layer 2 between the optically transparent front panel 1 and the electroluminescent layers 6, 7.
  • the organic electroluminescent layers 6.7 have a refractive index of 1.8, the ITO electrode layer has a refractive index of 1.7.
  • the mesoporous anti-reflective layer has a thickness of a few micrometers and a refractive index of ⁇ 1.25, the glass of the front panel has a refractive index of 1.46 to 1.5.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Surface Treatment Of Optical Elements (AREA)
EP03758561A 2002-11-12 2003-11-03 Organische elektrolumineszente lichtquelle mit antireflexionsschicht Withdrawn EP1563551A2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10252903 2002-11-12
DE10252903A DE10252903A1 (de) 2002-11-12 2002-11-12 Organische elektrolumineszente Lichtquelle mit Antireflexionsschicht
PCT/IB2003/004954 WO2004044999A2 (de) 2002-11-12 2003-11-03 Organische elektrolumineszente lichtquelle mit antireflexionsschicht

Publications (1)

Publication Number Publication Date
EP1563551A2 true EP1563551A2 (de) 2005-08-17

Family

ID=32115490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03758561A Withdrawn EP1563551A2 (de) 2002-11-12 2003-11-03 Organische elektrolumineszente lichtquelle mit antireflexionsschicht

Country Status (7)

Country Link
US (1) US7237920B2 (ja)
EP (1) EP1563551A2 (ja)
JP (1) JP2006505909A (ja)
CN (1) CN100573966C (ja)
AU (1) AU2003274586A1 (ja)
DE (1) DE10252903A1 (ja)
WO (1) WO2004044999A2 (ja)

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JP2005026688A (ja) 2003-06-30 2005-01-27 Osram Opto Semiconductors Gmbh 放射放出半導体チップ、該半導体チップの作製方法および該半導体チップの明るさの調整設定方法
DE102004029412A1 (de) * 2004-02-27 2005-10-13 Osram Opto Semiconductors Gmbh Strahlungsemittierender Halbleiterchip und Verfahren zur Herstellung eines solchen Halbleiterchips
TWI323728B (en) * 2004-08-31 2010-04-21 Ind Tech Res Inst Polymer film with three-dimensional nanopores and fabrication method thereof
US20060138946A1 (en) * 2004-12-29 2006-06-29 Jian Wang Electrical device with a low reflectivity layer
US7646144B2 (en) * 2006-12-27 2010-01-12 Eastman Kodak Company OLED with protective bi-layer electrode
KR101148886B1 (ko) * 2009-05-13 2012-05-29 네오뷰코오롱 주식회사 유기전계발광소자 및 그 제조방법
US20120119641A1 (en) * 2009-05-14 2012-05-17 Yijian Shi Output efficiency of organic light emitting devices
CN103503570B (zh) * 2011-03-03 2016-06-22 日东电工株式会社 用于发光装置的多孔膜
WO2013039914A1 (en) 2011-09-12 2013-03-21 Nitto Denko Corporation Efficient organic light-emitting diodes and fabrication of the same
TWI453255B (zh) * 2011-12-29 2014-09-21 Ind Tech Res Inst 具光取出層之光學元件結構
DE102013013129B4 (de) * 2013-08-07 2023-05-04 Osram Oled Gmbh Optoelektronisches Bauelement und Verfahren zur Herstellung eines optoelektronischen Bauelements
CN105098095B (zh) 2015-07-27 2017-05-31 京东方科技集团股份有限公司 一种有机发光二极管器件及其制作方法、显示装置

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EP1100129B1 (en) * 1999-11-10 2006-03-22 Matsushita Electric Works, Ltd. Substrate for light emitting device, light emitting device and process for production of light emitting device
WO2001034382A1 (en) * 1999-11-10 2001-05-17 Matsushita Electric Works, Ltd. Aerogel substrate and method for preparing the same
US6762553B1 (en) * 1999-11-10 2004-07-13 Matsushita Electric Works, Ltd. Substrate for light emitting device, light emitting device and process for production of light emitting device
EP1271227A1 (en) * 2001-06-26 2003-01-02 Nanomat Limited Electrochromic display for high resolution and method of producing the same

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Also Published As

Publication number Publication date
AU2003274586A1 (en) 2004-06-03
DE10252903A1 (de) 2004-05-19
US7237920B2 (en) 2007-07-03
WO2004044999A2 (de) 2004-05-27
CN100573966C (zh) 2009-12-23
WO2004044999A3 (de) 2004-10-21
JP2006505909A (ja) 2006-02-16
CN1711651A (zh) 2005-12-21
US20060220518A1 (en) 2006-10-05

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