Patents by Inventor Michael Zoelfl

Michael Zoelfl 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: 7667240
    Abstract: A radiation-emitting semiconductor chip having an absorbent brightness setting layer between a connection region and a current injection region and/or, as seen from the connection region, outside the current injection region on a front-side radiation coupling-out area of the semiconductor layer sequence. The brightness setting layer absorbs in a targeted manner part of the radiation generated in the semiconductor layer sequence. In another embodiment, a partly insulating brightness setting layer is arranged between the connection region and the active layer.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: February 23, 2010
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Michael Zoelfl, Wilhelm Stein, Ralph Wirth
  • Publication number: 20050045978
    Abstract: A radiation-emitting semiconductor chip (1) having a semiconductor layer sequence (3) comprising at least one active layer (2) that generates an electromagnetic radiation, and having an electrical contact layer (7) comprising a connection region (4) and a current injection region (5), which is arranged at a distance beside the connection region (4) and is electrically connected. In accordance with a first embodiment, an absorbent brightness setting layer (12) is applied between the connection region (4) and the current injection region (5) and/or, as seen from the connection region (4), outside the current injection region (5) on a front-side radiation coupling-out area (10) of the semiconductor layer sequence (3). The brightness setting layer absorbs in a targeted manner part of a radiation generated in the semiconductor layer sequence (3). In accordance with a second embodiment, a partly insulating brightness setting layer (6) is arranged between the connection region (4) and the active layer (2).
    Type: Application
    Filed: June 30, 2004
    Publication date: March 3, 2005
    Applicant: Osram Opto Semiconductors GmbH
    Inventors: Michael Zoelfl, Wilhelm Stein, Ralph Wirth