Patents by Inventor Gitte Harkonen

Gitte Harkonen 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).

  • Method of growing thin film electroluminescent structures
    Patent number: 6248605
    Abstract: The present invention concerns a method of growing a cerium-doped SrS phosphor layer by the Atomic Layer Epitaxy-method. According to the invention an organometallic cerium compound containing at least one cyclopentadienyl type ligand is used as a precursor for the dopant cerium. The cyclopentadienyl type cerium compounds can be used as ALE precursors at about 400° C. substrate temperatures without any observable thermal decomposition during processing.
    Type: Grant
    Filed: June 2, 1999
    Date of Patent: June 19, 2001
    Assignee: Planar Systems Inc.
    Inventors: Gitte Härkönen, Tomi Kervinen, Erkki Soininen, Runar Törnqvist, Kirsi Vasama, Mario Glanz, Herbert Schumann
  • Method of growing a ZnS:Mn phosphor layer for use in thin-film electroluminescent components
    Patent number: 6113977
    Abstract: The invention relates to a method of growing a ZnS:Mn phosphor layer suitable for use in thin-film electroluminescent components. According to the method, the ZnS:Mn phosphor layer is grown on a substrate by means of the ALE method using volatile zinc, sulfur and manganese compounds as the precursors. According to the invention, an organozinc compound such as diethylzinc or dimethylzinc is used as precursor for zinc, hydrogen sulfide or an organosulfur compound is used as precursor for sulfur, and an organomanganese compound or organic manganese complex compound is used as precursor for manganese. The invention provides a display component with drive-voltage-symmetrical light emission and stable characteristics of luminance level and turn-on voltage.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: September 5, 2000
    Assignee: Planar International Oy Ltd.
    Inventors: Erkki Lauri Soininen, Gitte Harkonen, Marja Lahonen, Runar Tornqvist, Juha Viljanen
  • Phosphor layer of an electroluminescent component
    Patent number: 5314759
    Abstract: The present invention relates to a multilayer phosphor layer system for an electroluminescent display. The phosphor layer according to the invention is comprised of several superimposed host matrix material layers (7) and interposed activator-containing doping layers (9, 10). The activator-containing doping layers (9, 10) are extremely thin, whereby disturbance to crystal growth of the host matrix material at the doping layer (9, 10) is avoided. The activator-containing doping layer (9, 10) can be comprised of an actual activator layer (10) and a matching layer (9) adapted between said host matrix material layer (7) and said actual activator layer (10), whereby said matching layer (9) improves the matching between said host matrix material layer (7) and said actual activator layer (10). By virtue of the layered structure, it is possible to use such host matrix/activator material pairs that otherwise would be useless due to their poor efficiency or weak light emission.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: May 24, 1994
    Assignee: Planar International Oy
    Inventors: Gitte Harkonen, Kari Harkonen, Runar Tornquist