Patents by Inventor Calvin H. W. Cheng

Calvin H. W. Cheng 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).

  • Heteroionic junction light emitting electrochemical cell
    Patent number: 7902744
    Abstract: A structure for high performance light emitting electrochemical cells comprises at least two active layers of mixed ionic/electronic conducting materials, at least one of which is electroluminescent. The active layers are sandwiched between ion blocking electrodes, typically metal and/or transparent conducting oxide, that are electrically but not ionically conductive. Application of bias to the electrodes results in the polarization of ions at the electrodes thereby generating a field to drive the injection of electronic carriers into the active layer. The injected electron and holes recombine within the active layers to emit light. The ability to balance electron and hole injection in the design of such devices provides for optimal light emission efficiency.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: March 8, 2011
    Assignee: The State of Oregon Acting by and through the State Board of Higher Education on Behalf of the University of Oregon
    Inventors: Mark C. Lonergan, Calvin H. W. Cheng, Dean H. Johnston
  • Heteroionic junction light emitting electrochemical cell
    Publication number: 20080157662
    Abstract: A structure for high performance light emitting electrochemical cells comprises at least two active layers of mixed ionic/electronic conducting materials, at least one of which is electroluminescent. The active layers are sandwiched between ion blocking electrodes, typically metal and/or transparent conducting oxide, that are electrically but not ionically conductive. Application of bias to the electrodes results in the polarization of ions at the electrodes thereby generating a field to drive the injection of electronic carriers into the active layer. The injected electron and holes recombine within the active layers to emit light. The ability to balance electron and hole injection in the design of such devices provides for optimal light emission efficiency.
    Type: Application
    Filed: December 13, 2007
    Publication date: July 3, 2008
    Inventors: Mark C. Lonergan, Calvin H. W. Cheng, Dean H. Johnston