Patents by Inventor Michael Stewart Weaver

Michael Stewart Weaver 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).

  • Phosphorescent organic light emitting devices combined with hole transport material having high operating stability
    Patent number: 9705092
    Abstract: An improved OLED includes an emitter layer disposed between a cathode and an anode where the emitter layer includes a host material and a phosphorescent emitter material. A first hole transport layer is disposed between the emitter layer and the anode and a second hole transport layer is disposed between the first hole transport layer and the anode. The first hole transport layer includes a first hole transport material that is a carbazole type compound and the second hole transport layer includes a second hole transport material that is different from the first hole transport material. The phosphorescent emitter material includes a phosphorescent organometallic compound that is a heteroleptic compound represented by the formula L2MX, LL?MX, LL?L?M, or LMXX?, wherein L, L?, L?, X, and X? are inequivalent, bidentate ligands and M is a metal that forms octahedral complexes, wherein L, L?, and L? are monoanionic inequivalent bidentate ligands coordinated to M through an sp2 hybridized carbon and a heteroatom.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: July 11, 2017
    Assignees: Universal Display Corporation, Hodogaya Chemical Co., Ltd.
    Inventors: Hitoshi Yamamoto, Michael Stewart Weaver, Norimasa Yokoyama, Makoto Nagaoka, Naoaki Kabasawa
  • PHOSPHORESCENT ORGANIC LIGHT EMITTING DEVICES COMBINED WITH HOLE TRANSPORT MATERIAL HAVING HIGH OPERATING STABILITY
    Publication number: 20140339518
    Abstract: An improved OLED includes an emitter layer disposed between a cathode and an anode where the emitter layer includes a host material and a phosphorescent emitter material. A first hole transport layer is disposed between the emitter layer and the anode and a second hole transport layer is disposed between the first hole transport layer and the anode. The first hole transport layer includes a first hole transport material that is a carbazole type compound and the second hole transport layer includes a second hole transport material that is different from the first hole transport material. The phosphorescent emitter material includes a phosphorescent organometallic compound that is a heteroleptic compound represented by the formula L2MX, LL?MX, LL?L?M, or LMXX?, wherein L, L?, L?, X, and X? are inequivalent, bidentate ligands and M is a metal that forms octahedral complexes, wherein L, L?, and L? are monoanionic inequivalent bidentate ligands coordinated to M through an sp2 hybridized carbon and a heteroatom.
    Type: Application
    Filed: August 5, 2011
    Publication date: November 20, 2014
    Applicants: HODOGAYA CHEMICAL CO., LTD., UNIVERSAL DISPLAY CORPORATION
    Inventors: Hitoshi Yamamoto, Michael Stewart Weaver, Norimasa Yokoyama, Makoto Nagaoka, Naoaki Kabasawa