Patents by Inventor Stelios Choulis

Stelios Choulis 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).

  • Radiation emitting device
    Patent number: 8610114
    Abstract: A radiation emitting device comprising a first electrode, which emits first charge carriers having a first charge during operation, a first charge carrier transporting layer, which comprises a fluorescent substance, a second charge carrier transporting layer, which contains a phosphorescent substance, and a second electrode, which emits second charge carriers having a second charge during operation, wherein during operation the second charge carrier transporting layer is largely free of first charge carriers.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: December 17, 2013
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Vi-En Choong, Stelios A. Choulis, Matthew K. Mathai
  • Radiation Emitting Device
    Publication number: 20120153305
    Abstract: A radiation emitting device comprising a first electrode, which emits first charge carriers having a first charge during operation, a first charge carrier transporting layer, which comprises a fluorescent substance, a second charge carrier transporting layer, which contains a phosphorescent substance, and a second electrode, which emits second charge carriers having a second charge during operation, wherein during operation the second charge carrier transporting layer is largely free of first charge carriers.
    Type: Application
    Filed: February 28, 2012
    Publication date: June 21, 2012
    Applicant: OSRAM Opto Semiconductors GmbH
    Inventors: Vi-En CHOONG, Stelios A. Choulis, Matthew K. Mathai
  • Radiation emitting device
    Patent number: 8173998
    Abstract: A radiation emitting device comprising a first electrode, which emits first charge carriers having a first charge during operation, a first charge carrier transporting layer, which comprises a fluorescent substance, a second charge carrier transporting layer, which contains a phosphorescent substance, and a second electrode, which emits second charge carriers having a second charge during operation, wherein during operation the second charge carrier transporting layer is largely free of first charge carriers.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: May 8, 2012
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Vi-En Choong, Stelios A. Choulis, Mathew K. Mathai
  • Interface conditioning to improve efficiency and lifetime of organic electroluminescence devices
    Patent number: 8101941
    Abstract: In at least one embodiment of the invention, an OLED device is disclosed in which the surface of one or more layers of the OLED are conditioned with metal nano-particles such that they are disposed along the interface between adjacent layers.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: January 24, 2012
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Stelios A. Choulis, Mathew Mathai, Vi-En Choong
  • Photovoltaic Cell Having Multiple Electron Donors
    Publication number: 20100224252
    Abstract: Photovoltaic cells having multiple electron donors and/or multiple acceptors, as well as related components, modules, systems, and methods, are disclosed.
    Type: Application
    Filed: March 4, 2010
    Publication date: September 9, 2010
    Applicant: Konarka Technologies, Inc.
    Inventors: Markus Scharber, Markus Koppe, Pavel Schilinsky, Christoph Josef Brabec, Stelios A. Choulis, Gilles Herve Regis Dennler, Hans-Joachim Albert Egelhaaf, Markus Heinz Biele
  • Organic electrophosphorescence device having interfacial layers
    Patent number: 7772761
    Abstract: Techniques are described for forming an organic light emitting diode device with improved device efficiency. Materials having at least one energy level that is similar to those of a phosphorescent light emitting material in the diode are incorporated into the device to directly inject holes or electrons to the light emitting material.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: August 10, 2010
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Stelios A. Choulis, Mathew Mathai, Vi-En Choong, Franky So
  • Polymer and small molecule based hybrid light source
    Patent number: 7679282
    Abstract: An organic electroluminescent device, includes: a substrate; a hole-injecting electrode (anode) coated over the substrate; a hole injection layer coated over the anode; a hole transporting layer coated over the hole injection layer; a polymer based light emitting layer, coated over the hole transporting layer; a small molecule based light emitting layer, thermally evaporated over the polymer based light emitting layer; and an electron-injecting electrode (cathode) deposited over the electroluminescent polymer layer.
    Type: Grant
    Filed: December 5, 2005
    Date of Patent: March 16, 2010
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Vi-En Choong, Stelios Choulis, Benjamin Claus Krummacher, Mathew Mathai, Franky So
  • Tandem Photovoltaic Cells
    Publication number: 20090211633
    Abstract: Tandem photovoltaic cells, as well as related systems, methods, and components, are disclosed.
    Type: Application
    Filed: February 19, 2009
    Publication date: August 27, 2009
    Applicant: Konarka Technologies Inc.
    Inventors: Pavel Schilinsky, Stelios A. Choulis
  • Method to generate high efficient devices which emit high quality light for illumination
    Patent number: 7554257
    Abstract: An electroluminescent apparatus includes an OLED device emitting light in the blue and green spectrums, and at least one down conversion layer. The down conversion layer absorbs at least part of the green spectrum light and emits light in at least one of the orange spectra and red spectra.
    Type: Grant
    Filed: June 22, 2005
    Date of Patent: June 30, 2009
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Benjamin C. Krummacher, Mathew Mathai, Vi-En Choong, Stelios A. Choulis
  • Radiation emitting device
    Publication number: 20090039294
    Abstract: A radiation emitting device comprising a first electrode, which emits first charge carriers having a first charge during operation, a first charge carrier transporting layer, which comprises a fluorescent substance, a second charge carrier transporting layer, which contains a phosphorescent substance, and a second electrode, which emits second charge carriers having a second charge during operation, wherein during operation the second charge carrier transporting layer is largely free of first charge carriers.
    Type: Application
    Filed: June 6, 2008
    Publication date: February 12, 2009
    Applicant: OSRAM Opto Semiconductors GmbH
    Inventors: Vi-En Choong, Stelios A. Choulis, Matthew K. Mathai
  • OLED with Area Defined Multicolor Emission Within a Single Lighting Element
    Publication number: 20070182316
    Abstract: Disclosed is an organic electroluminescent device, comprising: a) a substrate; b) a first electrode disposed over the substrate; c) a composite light emitting layer comprising two or more light emissive materials, disposed over the first electrode; and d) a second electrode disposed over the composite light emissive layer, the electrodes commonly and singularly addressing the composite light emissive layer.
    Type: Application
    Filed: February 1, 2007
    Publication date: August 9, 2007
    Inventors: Mathew Mathai, Vi-En Choong, Stelios Choulis
  • OLED with area defined multicolor emission within a single lighting element
    Publication number: 20070176539
    Abstract: Disclosed is an organic electroluminescent device, comprising: a) a substrate; b) a hole-injecting electrode (anode) coated over the substrate; c) a hole injection layer coated over the anode; e) a composite light emitting layer comprising two or more light emissive materials, coated over the hole transporting layer; and f) an electron-injecting electrode (cathode) deposited over the composite light emissive layer, the electrodes commonly and singularly addressing the composite light emissive layer.
    Type: Application
    Filed: February 1, 2006
    Publication date: August 2, 2007
    Inventors: Mathew Mathai, Vi-En Choong, Stelios Choulis
  • Organic electrophosphorescence device
    Publication number: 20070069636
    Abstract: Techniques are described for forming an organic light emitting diode device with improved device efficiency. Materials having at least one energy level that is similar to those of a phosphorescent light emitting material in the diode are incorporated into the device to directly inject holes or electrons to the light emitting material.
    Type: Application
    Filed: September 28, 2005
    Publication date: March 29, 2007
    Inventors: Stelios Choulis, Mathew Mathai, Vi-En Choong, Franky So
  • Interface conditioning to improve efficiency and lifetime of organic electroluminescence devices
    Publication number: 20070069199
    Abstract: In at least one embodiment of the invention, an OLED device is disclosed in which the surface of one or more layers of the OLED are conditioned with metal nano-particles such that they are disposed along the interface between adjacent layers.
    Type: Application
    Filed: September 26, 2005
    Publication date: March 29, 2007
    Inventors: Stelios Choulis, Mathew Mathai, Vi-En Choong
  • Polymer and small molecule based hybrid light source
    Publication number: 20060199036
    Abstract: Disclosed is an organic electroluminescent device, comprising: a) a substrate; b) a hole-injecting electrode (anode) coated over the substrate; c) a hole injection layer coated over the anode; e) a polymer based light emitting layer, coated over the hole transporting layer; f) a small molecule based light emitting layer, thermally evaporated over the polymer based light emitting layer; and g) an electron-injecting electrode (cathode) deposited over the electroluminescent polymer layer.
    Type: Application
    Filed: December 5, 2005
    Publication date: September 7, 2006
    Inventors: Vi-En Choong, Stelios Choulis, Benjamin Krummacher, Mathew Mathai, Franky So
  • Novel method to generate high efficient devices which emit high quality light for illumination
    Publication number: 20060197437
    Abstract: What is disclosed is an electroluminescent apparatus comprising: an OLED device emitting light in the blue and green spectrums; and at least one down conversion layer, said down conversion layer absorbing at least part of the green spectrum light and emitting in at least one of the orange spectra and red spectra.
    Type: Application
    Filed: June 22, 2005
    Publication date: September 7, 2006
    Inventors: Benjamin Krummacher, Mathew Mathai, Vi-En Choong, Stelios Choulis
  • Organic electroluminescent device
    Publication number: 20060199035
    Abstract: An electroluminescent device incorporating high electron affinity additives of siloles or silacyclopentadienes, and their derivatives. The above additives can be incorporated within the emissive layer or interlayer or in both of these layers.
    Type: Application
    Filed: March 2, 2005
    Publication date: September 7, 2006
    Inventors: Stelios Choulis, Dmytro Poplavskyy