Patents by Inventor Karl Leo

Karl Leo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7781961
    Abstract: In order, in the case of an OLED, to improve the coupling-out efficiency, a top emitting electroluminescent component (100) is proposed, comprising a substrate (110), a first electrode (120) closest to the substrate, a transparent electrode (140) located at a distance from the substrate, and at least one light-emitting organic layer (130) arranged between the two electrodes. The component according to the invention is distinguished by the fact that a coupling-out layer (150) is arranged on that side of the second electrode which is remote from the at least one organic layer, said coupling-out layer comprising conversion centres (151) which partly absorb the light emitted by the at least one organic layer and emit it again with an altered frequency.
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: August 24, 2010
    Assignee: Novaled AG
    Inventors: Jan Birnstock, Martin Vehse, Karl Leo
  • Publication number: 20100135073
    Abstract: The invention relates to an organic electronic memory component having an electrode and a counterelectrode and an organic layer arrangement formed between said electrode and counterelectrode and in electrical contact herewith. wherein the organic layer arrangement comprises the following organic layers: an electrode-specific charge carrier transport layer and a counterelectrode-specific charge carrier-blocking layer and disposed between said electrode-specific charge carrier transport layer and counterelectrode-specific charge carrier-blocking layer a memory layer region having a charge carrier-storing layer and a further charge carrier-storing layer between which charge carrier-storing layer and a further charge carrier-storing layer is disposed a charge carrier barrier layer. Furthermore the invention relates to a method for the operating of an organic electronic memory component.
    Type: Application
    Filed: April 17, 2008
    Publication date: June 3, 2010
    Applicant: NOVALED AG
    Inventors: Frank Lindner, Karsten Walzer, Karl Leo, Philipp Sebastian
  • Publication number: 20100065833
    Abstract: The invention relates to an organic field-effect transistor, in particular an organic thin film field-effect transistor comprising a gate electrode, a drain electrode and a source electrode, a dielectric layer which is formed in contact with the gate electrode, an active layer made from an organic material which is in contact with the drain electrode and the source electrode and which is configured electrically undoped, a dopant material layer which contains a dopant material that is an electrical dopant for the organic material of the active layer, and a border surface region in which a planar contact is formed between the active layer and the dopant material layer, wherein mobility of similar electrical charge carriers, namely electrons or holes, in the dopant material layer is no more than half as great as in the active layer.
    Type: Application
    Filed: August 3, 2009
    Publication date: March 18, 2010
    Applicant: NOVALED AG
    Inventors: Qiang Huang, Tobias Canzler, Ulrich Denker, Ansgar Werner, Karl Leo, Kentaro Harada
  • Patent number: 7675057
    Abstract: The invention relates to a photoactive component, especially a solar cell, comprising organic layers and formed by at least one stacked pi, ni, and/or pin diode. The diodes are characterized in that they comprise at least one p-doped or n-doped transport layer having a larger optical band gap than that of the photoactive layer. The individual diodes are characterized by a high internal quantum yield, but can be optically thin (peak absorption <80%). A high external quantum yield is obtained by either enlarging the optical path of the incident light in the diodes using light traps, or by stacking a plurality of the diodes. The transition between two diodes being facilitated by transition layers for the purposes of improved recombination and generation. Both forms of embodiment have a number of specific advantages using the doped transport layers with a large band gap.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: March 9, 2010
    Assignee: Technische Universitaet Dresden
    Inventors: Jens Drechsel, Martin Pfeiffer, Bert Maennig, Karl Leo
  • Publication number: 20100026176
    Abstract: The presently described subject matter relates to transparent and thermally stable light-emitting components having organic layers, and in particular to a transparent organic light-emitting diode having a charge carrier transport layer which is electrically doped with an organic dopant.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 4, 2010
    Inventors: Jan Blochwitz-Nomith, Karl Leo, Martin Pfeiffer, Xiang Zhou
  • Patent number: 7598519
    Abstract: The invention concerns a transparent light-emitting component, in particular an organic light-emitting diode (OLED), with a layer arrangement in which a light-emitting organic layer is arranged between an upper and a lower electrode, the layer arrangement being transparent in a switched-off state and emitting light which is produced in the light-emitting organic layer by applying an electric voltage to the upper and the lower electrode in a switched-on state, which light is radiated in a ratio of at least approximately 4:1 through the upper or the lower electrode and where a stack, which is transparent in the visible spectral region, of dielectric layers is arranged on the side of the upper or the lower electrode.
    Type: Grant
    Filed: May 25, 2006
    Date of Patent: October 6, 2009
    Assignee: Novaled AG
    Inventors: Karl Leo, Vadim Lyssenko, Robert Gelhaar
  • Publication number: 20090235971
    Abstract: The invention relates to a photoactive device with organic layers, especially a solar cell, with a layer arrangement having an electrode and a counterelectrode as well as a sequence of organic layers arranged between the electrode and the counterelectrode, wherein two layers bordering on one another are formed in a photoactive region encompassed by the sequence of organic layers, namely, an exciton-harvesting layer (EHL) and an exciton-separating layer (ESL); in which the exciton-harvesting layer (EHL) is a mixed layer containing an organic material (A) and at least one further organic material (B), in which (i) a lowest singlet excitation state for excitons (S1A) of the organic material (A) is energetically higher than a lowest singlet excitation state for excitons (S1B) of the further organic material (B), (ii) the further organic material (B) is chosen such that it transforms singlet excitons into triplet excitons with a quantum yield of at least approximately 20%, preferably of at least approximately 50%
    Type: Application
    Filed: October 17, 2008
    Publication date: September 24, 2009
    Inventors: Martin Pfeiffer, Christian Uhrich, Annette Petrich, Rico Schuppel, Karl Leo, Peter Bauerle, Eduard Brier, Pinar Kilickiran
  • Publication number: 20090217980
    Abstract: The invention relates to an organic photoactive device, especially an organic photovoltaic cell, with a contact and a countercontact as well as with an organic region that is electrically connected to the contact and the countercontact, wherein a photoactive region with a photoactive bulk heterojunction or a flat heterojunction between an electron-conducting organic material and a hole-conducting organic material is formed in the organic region and wherein the hole-conducting organic material and/or the electron-conducting organic material is formed from oligomers according to any one of the following types: conjugated acceptor-donor-acceptor oligomer (A-D-A? oligomer) with an acceptor unit (A) and a further acceptor unit (A?) that are each connected to a donor unit (D), and conjugated donor-acceptor-donor oligomer (D-A-D? oligomer) with a donor unit (D) and a further donor unit (D?) that are each connected to an acceptor unit (A).
    Type: Application
    Filed: March 3, 2006
    Publication date: September 3, 2009
    Applicants: HELIATEK GMBH, UNIVERSITAT ULM
    Inventors: Martin Pfeiffer, Christian Uhrich, Annette Petrich, Rico Schuppel, Kerstin Schulze, Karl Leo, Peter Bäuerle, Egon Reinold, Eduard Brier
  • Publication number: 20090134309
    Abstract: A chip for analyzing a medium includes an organic light emitter for emitting a light signal, a photodetector including a detector area, a layer sequence separating the organic light emitter and the detector area, and a reservoir into which the medium may be introduced. The organic light emitter and the photodetector are optically couplable by means of a path of rays of the light signal, and the reservoir is arranged within the path of rays of the light signal.
    Type: Application
    Filed: November 21, 2008
    Publication date: May 28, 2009
    Applicant: Fraunhofer-Gesellschaft zur foerderung der angewandten Forschung e.V.
    Inventors: Karl LEO, Uwe VOGEL
  • Publication number: 20090051271
    Abstract: In order, in the case of an OLED, to improve the coupling-out efficiency, a top emitting electroluminescent component (100) is proposed, comprising a substrate (110), a first electrode (120) closest to the substrate, a transparent electrode (140) located at a distance from the substrate, and at least one light-emitting organic layer (130) arranged between the two electrodes. The component according to the invention is distinguished by the fact that a coupling-out layer (150) is arranged on that side of the second electrode which is remote from the at least one organic layer, said coupling-out layer comprising conversion centres (151) which partly absorb the light emitted by the at least one organic layer and emit it again with an altered frequency.
    Type: Application
    Filed: August 30, 2005
    Publication date: February 26, 2009
    Inventors: Jan Birnstock, Martin Vehse, Karl Leo
  • Publication number: 20070278479
    Abstract: The invention relates to a process for producing doped organic semiconductor materials with an elevated charge carrier density and effective charge carrier mobility by doping, in which the doping agent is substantially produced by electrocrystallization in a first step, the doping agent is selected from a group of organic compounds with a low oxidation potential, and in which an organic semiconductor material is doped with the doping agent in a second step. Furthermore, the invention relates to doped organic semiconductor materials with an elevated charge carrier density and effective charge carrier mobility produced by the aforementioned process. Furthermore, the invention relates to an organic diode comprising doped organic semiconductor materials produced in accordance with the aforementioned process.
    Type: Application
    Filed: October 8, 2004
    Publication date: December 6, 2007
    Inventors: Ansgar Werner, Martin Pfeiffer, Kentaro Harada, Karl Leo, C. Elliot
  • Patent number: 7274141
    Abstract: A light emitting component with organic layers, e.g., an organic light-emitting diode, which includes a substrate, at least one light emitting layer, and at least one charge carrier transport layer, having a cathode on the substrate and light emission through the anode. The light emitting component may further include a transport layer that is p-doped with an organic material.
    Type: Grant
    Filed: July 5, 2002
    Date of Patent: September 25, 2007
    Assignee: NovaLED GmbH
    Inventors: Karl Leo, Jan Blochwitz-Nimoth, Martin Pfeiffer
  • Publication number: 20070145355
    Abstract: The present invention relates to a doped organic semiconductor material comprising an organic matrix material which is doped with at least one heteromonocyclic and/or heteropolycyclic compound, the compound having at least one nitrogen atom with a free electron pair.
    Type: Application
    Filed: December 22, 2005
    Publication date: June 28, 2007
    Inventors: Ansgar Werner, Horst Hartmann, Fenghong Li, Martin Pfeiffer, Karl Leo
  • Publication number: 20070090371
    Abstract: The invention relates to a photoactive component, especially a solar cell, comprising organic layers and formed by at least one stacked pi, ni, and/or pin diode. The diodes are characterised in that they comprise at least one p-doped or n-doped transport layer having a larger optical band gap than that of the photoactive layer. The individual diodes are characterised by a high internal quantum yield, but can be optically thin (peak absorption <80%). A high external quantum yield is obtained by either enlarging the optical path of the incident light in the diodes using light traps, or by stacking a plurality of the diodes. The transition between two diodes being facilitated by transition layers for the purposes of improved recombination and generation. Both forms of embodiment have a number of specific advantages using the doped transport layers with a large band gap.
    Type: Application
    Filed: March 19, 2004
    Publication date: April 26, 2007
    Applicant: Technische Universitaet Dresden
    Inventors: Jens Drechsel, Martin Pfeiffer, Bert Maennig, Karl Leo
  • Publication number: 20070051946
    Abstract: Organic light-emitting diode with a layer arrangement which comprises an electrode, a counter electrode and an organic layer sequence arranged between the electrode and the counter electrode, where the organic layer sequence is arranged on a metal substrate and one or several organic transport layers containing in each case an admixture for increasing the electric conductivity and which are formed with at least one of the features from the following group of features: charge carrier transporting and charge carrier injecting.
    Type: Application
    Filed: June 27, 2006
    Publication date: March 8, 2007
    Applicant: NOVALED AG
    Inventors: Karsten Walzer, Teja Roch, Qiang Huang, Karl Leo
  • Patent number: 7161292
    Abstract: In a white light LED, multicolor-emitting light emitter layers of macroscopic structure widths, whose emission spectra can be mixed to form white light, are arranged laterally next to one another on a first transparent electrode layer. The light emitter layers are preferably in strip form and have, for the purpose of simplifying production, macroscopic dimensions that can be resolved by the eye. The thickness of a light-scattering substrate is chosen such that the radiation beams emitted by the light emitter layers are at least partly superposed on the light exit surface of the light-scattering substrate, thereby creating the optical impression of a white light source.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: January 9, 2007
    Assignee: Novaled GmbH
    Inventor: Karl Leo
  • Publication number: 20060284170
    Abstract: The invention concerns a transparent light-emitting component, in particular an organic light-emitting diode (OLED), with a layer arrangement in which a light-emitting organic layer is arranged between an upper and a lower electrode, the layer arrangement being transparent in a switched-off state and emitting light which is produced in the light-emitting organic layer by applying an electric voltage to the upper and the lower electrode in a switched-on state, which light is radiated in a ratio of at least approximately 4:1 through the upper or the lower electrode and where a stack, which is transparent in the visible spectral region, of dielectric layers is arranged on the side of the upper or the lower electrode.
    Type: Application
    Filed: May 25, 2006
    Publication date: December 21, 2006
    Applicant: NOVALED AG
    Inventors: Karl Leo, Vadim Lyssenko, Robert Gelhaar
  • Publication number: 20060280869
    Abstract: This invention relates to a photoluminescent layer in the optical and adjoining spectral regions based on a solid solution of organic dyes. The photoluminescent layer includes organic dye molecules with a low dye concentration and a matrix material of metal oxides, with the matrix material having a slightly sub-stoichiometric oxygen content. A method and a device for producing the photoluminescent layer are described.
    Type: Application
    Filed: August 24, 2006
    Publication date: December 14, 2006
    Inventors: Hartmut Frob, Matthias Kurpiers, Karl Leo
  • Patent number: 7101626
    Abstract: This invention relates to a photoluminescent layer in the optical and adjoining spectral regions based on a solid solution of organic dyes. The photoluminescent layer consists of organic dye molecules with a low dye concentration and a matrix material of metal oxides, with the matrix material having a slightly sub-stoichiometric oxygen content. A method and a device for producing the photoluminescent layer are described.
    Type: Grant
    Filed: February 23, 2000
    Date of Patent: September 5, 2006
    Assignee: Osram GmbH
    Inventors: Hartmut Fröb, Karl Leo, Matthias Kurpiers
  • Patent number: 7074500
    Abstract: The invention relates to a light-emmiting component having organic layers, in particular to an organic light-emmiting diode. The component has at least one doped charge carrier transport layer (2), a light-emmiting layer (4) and contact layers (1, 5) and also has a blocking layer (3; 3?) wherein an organic material is provided between the charge carrier transport layer (2, 2?) and the light-emmiting layer (4). The energy levels of the charge carried transport layer are chosen in such a way that efficient doping is possible and the blocking layer nevertheless ensures that non-radiating recombination processes on the interface with the emitting layer are prevented.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: July 11, 2006
    Assignee: NovaLED GmbH
    Inventors: Martin Pfeiffer, Karl Leo, Jan Blochwitz-Niemoth, Xiang Zhou