Patents by Inventor Kazuhiro Oikawa

Kazuhiro Oikawa 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: 11444251
    Abstract: Provided is an organic electroluminescent element having high efficiency, a long lifetime, and bending resistance. An organic electroluminescent element includes a light emitting layer and an electron transport layer adjacent to the light emitting layer between a positive electrode and a negative electrode. A host compound of the light emitting layer has an ionization potential deeper than that of a light emitting dopant of the light emitting layer by 0.3 eV or more. At least one organic compound contained in the electron transport layer has a molecular dipole moment of 6.0 debye or more.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: September 13, 2022
    Assignee: MERCK PATENT GMBH
    Inventors: Kazuhiro Oikawa, Akihiro Kimura
  • Publication number: 20220285623
    Abstract: Provided is an inkjet recording medium for an organic semiconductor device including a base material, an electrode, and ink receiving layer in this order, wherein the ink receiving layer has an ink penetration prevention area on an electrode side that prevents ink which permeates from a surface far from the electrode toward the electrode from reaching the electrode.
    Type: Application
    Filed: February 9, 2022
    Publication date: September 8, 2022
    Inventors: Hideo TAKA, Tomoo IZUMI, Kazuhiro OIKAWA
  • Patent number: 10529954
    Abstract: An object of the present invention is to provide an organic thin-film laminate capable of suppressing function reduction even when an intermediate layer is formed using a wet method. The organic thin-film laminate has one or more organic functional layers, the organic thin-film laminate being characterized by being provided with: a first light-emitting layer 12 containing a first light-emitting-layer material that is soluble in a polar solvent other than a fluorinated solvent, and is insoluble in a fluorinated solvent; a second light-emitting layer 14 laminated on the first light-emitting layer 12; and one or more intermediate layers comprising a non-curable material, the intermediate layers being provided between the first light-emitting layer 12 and the second light-emitting layer 14, an intermediate layer 13, among the one or more intermediate layers, containing a conductive polymer having no polymerizable group and containing a fluorinated solvent in the range of 1-1000 mass ppm.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: January 7, 2020
    Assignees: KONICA MINOLTA, INC., NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY
    Inventors: Kazuhiro Oikawa, Toshihiko Iwasaki, Takayuki Chiba, Yong-Jin Pu, Junji Kido
  • Publication number: 20190288219
    Abstract: Provided is an organic electroluminescent element having high efficiency, a long lifetime, and bending resistance. An organic electroluminescent element includes a light emitting layer and an electron transport layer adjacent to the light emitting layer between a positive electrode and a negative electrode. A host compound of the light emitting layer has an ionization potential deeper than that of a light emitting dopant of the light emitting layer by 0.3 eV or more. At least one organic compound contained in the electron transport layer has a molecular dipole moment of 6.0 debye or more.
    Type: Application
    Filed: October 17, 2017
    Publication date: September 19, 2019
    Inventors: Kazuhiro OIKAWA, Akihiro KIMURA
  • Patent number: 10141520
    Abstract: One objective of the present invention is to provide a coating liquid for forming a light emitting layer, which improves quantum efficiency. Another objective of the present invention is to provide: an organic electroluminescent element which is formed by means of this coating liquid for forming a light emitting layer; a lighting device, a display device and a white electroluminescent device, each of which is provided with this organic electroluminescent element; and a method for manufacturing an organic electroluminescent element. A coating liquid for forming a light emitting layer according to the present invention is used for the purpose of forming a light emitting layer, which is one of one or more organic layers held between a positive electrode and a negative electrode, and this coating liquid for forming a light emitting layer is characterized by containing a thermally activated delayed fluorescent compound.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: November 27, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Kazuhiro Oikawa, Hideo Taka, Dai Ikemizu
  • Publication number: 20180183011
    Abstract: An object of the present invention is to provide an organic thin-film laminate capable of suppressing function reduction even when an intermediate layer is formed using a wet method. The organic thin-film laminate has one or more organic functional layers, the organic thin-film laminate being characterized by being provided with: a first light-emitting layer 12 containing a first light-emitting-layer material that is soluble in a polar solvent other than a fluorinated solvent, and is insoluble in a fluorinated solvent; a second light-emitting layer 14 laminated on the first light-emitting layer 12; and one or more intermediate layers comprising a non-curable material, the intermediate layers being provided between the first light-emitting layer 12 and the second light-emitting layer 14, an intermediate layer 13, among the one or more intermediate layers, containing a conductive polymer having no polymerizable group and containing a fluorinated solvent in the range of 1-1000 mass ppm.
    Type: Application
    Filed: March 18, 2016
    Publication date: June 28, 2018
    Inventors: Kazuhiro OIKAWA, Toshihiko IWASAKI, Takayuki CHIBA, Yong-Jin PU, Junji KIDO
  • Publication number: 20160056393
    Abstract: One objective of the present invention is to provide a coating liquid for forming a light emitting layer, which improves quantum efficiency. Another objective of the present invention is to provide: an organic electroluminescent element which is formed by means of this coating liquid for forming a light emitting layer; a lighting device, a display device and a white electroluminescent device, each of which is provided with this organic electroluminescent element; and a method for manufacturing an organic electroluminescent element. A coating liquid for forming a light emitting layer according to the present invention is used for the purpose of forming a light emitting layer, which is one of one or more organic layers held between a positive electrode and a negative electrode, and this coating liquid for forming a light emitting layer is characterized by containing a thermally activated delayed fluorescent compound.
    Type: Application
    Filed: April 1, 2014
    Publication date: February 25, 2016
    Inventors: Kazuhiro OIKAWA, Hideo TAKA, Dai IKEMIZU
  • Patent number: 8759826
    Abstract: The organic electroluminescent element (100) of the present invention comprises, on a substrate (1), electrodes (positive electrode (2) and negative electrode (8)) forming a pair and an organic functional layer (20) having at least an electron transport layer (6) and a light emitting layer (5). At least one of the electron transport layer (6) and the light emitting layer (5) contain semiconductor nanoparticles having a conduction band energy level of ?5.5-?1.5 ev.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: June 24, 2014
    Assignee: Konica Minolta, Inc.
    Inventor: Kazuhiro Oikawa
  • Publication number: 20130200360
    Abstract: The organic electroluminescent element (100) of the present invention comprises, on a substrate (1), electrodes (positive electrode (2) and negative electrode (8)) forming a pair and an organic functional layer (20) having at least an electron transport layer (6) and a light emitting layer (5). At least one of the electron transport layer (6) and the light emitting layer (5) contain semiconductor nanoparticles having a conduction band energy level of ?5.5-?1.5 ev.
    Type: Application
    Filed: October 12, 2011
    Publication date: August 8, 2013
    Applicant: KONICA MINOLTA , INC.
    Inventor: Kazuhiro Oikawa
  • Publication number: 20080110359
    Abstract: A plate making method for making a printing plate from a printing plate material, this plate making method including an image output process for outputting an image onto the printing plate material in conformity to the first control strip image data which form a pseudo gradation in the two-dimensional direction having the density gradation in the longitudinal direction and the second control strip image data which form a pseudo gradation being different from the abovementioned pseudo gradation in the two-dimensional direction and having a uniform density in the longitudinal direction, and an image forming process for forming on this printing plate an image 1 based on the first control strip image data, and an image 2 based on the second control strip image data.
    Type: Application
    Filed: October 23, 2007
    Publication date: May 15, 2008
    Applicant: Konica Minolta Medical & Graphic, Inc.
    Inventor: Kazuhiro Oikawa
  • Publication number: 20070254246
    Abstract: A developer used for developing a planographic printing plate material is disclosed and the developer is an alkaline solution comprising a compound represented by formula: R1—O—(R2—O)n—H wherein R1 is a branched alkyl group having carbon atoms of not more than 20 which may be interrupted by —NH—; R2 is an alkylene group having carbon atoms of 1 to 10; and n is an integer of 2 to 100. There is also disclosed a method of processing a planographic printing plate material with the developer.
    Type: Application
    Filed: April 23, 2007
    Publication date: November 1, 2007
    Inventor: Kazuhiro Oikawa