Patents by Inventor Hiroya Yasuda

Hiroya Yasuda 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).

  • Organic electroluminescent device
    Patent number: 8895154
    Abstract: Provided is an organic electroluminescent device in which an organic thin film layer comprising a single layer or plural layers comprising a phosphorescence light-emitting layer containing at least a host material and a phosphorescent organic metal complex is interposed between a cathode and an anode, wherein the total of the halogen element mass concentrations of bromine, iodine and chlorine which are contained as impurities in the host material constituting the light-emitting layer described above is 50 ppm or less. It has a high emission luminance, a high luminous efficiency and a long life.
    Type: Grant
    Filed: March 1, 2005
    Date of Patent: November 25, 2014
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Hiroya Yasuda, Kiyoshi Ikeda, Keiko Yamamichi, Takashi Arakane, Chishio Hosokawa
  • Organic electroluminescent device
    Publication number: 20070172698
    Abstract: Provided is an organic electroluminescent device in which an organic thin film layer comprising a single layer or plural layers comprising a phosphorescence light-emitting layer containing at least a host material and a phosphorescent organic metal complex is interposed between a cathode and an anode, wherein the total of the halogen element mass concentrations of bromine, iodine and chlorine which are contained as impurities in the host material constituting the light-emitting layer described above is 50 ppm or less. It has a high emission luminance, a high luminous efficiency and a long life.
    Type: Application
    Filed: March 1, 2005
    Publication date: July 26, 2007
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Hiroya Yasuda, Kiyoshi Ikeda, Keiko Yamamichi, Takashi Arakane, Chishio Hosokawa
  • Material for organic electroluminescence element, and organic electroluminescence element using the same
    Publication number: 20060141284
    Abstract: A material for an organic electroluminescence (EL) element comprising a compound with a specific condensed ring structure having a nitrogen atom; and an organic EL element which comprises a cathode, an anode and, sandwiched between them, one or more of organic thin film layers, wherein at least one organic thin film layer is an organic EL layer containing the above material for an organic EL element. The material for an organic EL element can provide an organic EL element being capable of achieving high current efficiency with a low electric voltage.
    Type: Application
    Filed: October 15, 2003
    Publication date: June 29, 2006
    Inventors: Seiji Tomita, Toshihiro Iwakuma, Takashi Arakane, Hiroya Yasuda, Chishio Hosokawa