Patents by Inventor Toshihiro Iwakuma

Toshihiro Iwakuma 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: 10505123
    Abstract: A compound that includes a structure including two or more structures represented by the following formula (1) in the same molecule and in which at least two of the structures represented by the formula (1) are directly bonded to each other by a single bond.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: December 10, 2019
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Kei Yoshida, Toshihiro Iwakuma, Ryohei Hashimoto
  • Patent number: 10079343
    Abstract: An organic electroluminescence device (1) includes: an anode (3); a cathode (4); and an organic thin-film layer (10) interposed between the anode (3) and the cathode (4). The organic thin-film layer (10) includes a phosphorescent-emitting layer (5) containing a host and a phosphorescent dopant. The host contains a first host and a second host. The first host includes a substituted or unsubstituted polycyclic fused aromatic skeleton, the skeleton having 10 to 30 ring-forming atoms not including an atom of a substituent. The second host has an affinity level greater than the affinity level of the first host.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: September 18, 2018
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Kazuki Nishimura, Toshihiro Iwakuma, Kenichi Fukuoka, Chishio Hosokawa
  • Patent number: 10026907
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a n-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: July 17, 2018
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki Kato, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Patent number: 10020454
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a ?-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: July 10, 2018
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki Kato, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Patent number: 9991447
    Abstract: A compound represented by the following formula (1): wherein in the formula (1), Ar1 and Ar2 are independently a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted alkyl group; X1 to X4 and X13 to X16 are independently CR1, CH or N; one of X5 to X8 is a carbon atom bonding to one of X9 to X12, and at least one of X5 to X8 that is adjacent to the carbon atom bonding to one of X9 to X12 is CR2; one of X9 to X12 is a carbon atom bonding to one of X5 to X8, and X9 to X12 that is adjacent to the carbon atom bonding to one of X5 to X8 is CH or N; and the remaining X5 to X8 and the remaining X9 to X12 are CR1, CH or N.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: June 5, 2018
    Assignee: IDEMITSU KOREA CO., LTD.
    Inventors: Toshihiro Iwakuma, Kei Yoshida
  • Patent number: 9985232
    Abstract: An organic electroluminescence device utilizes a novel combination of one or more biscarbazole derivative compounds as the phosphorescent host material in combination with an organometallic phosphorescent material as a dopant in the light emitting region of the device, where the biscarbazole derivative compounds are represented by a formula (1A) or (2A) below: where A1 represents a substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; A2 represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; X1 and X2 each are a linking group; Y1 to Y4 each represent a substituent; p and q represent an integer of 1 to 4; and r and s represent an integer of 1 to 3; and the organometallic phosphorescent material is a compound having a substituted chemical structure represented by the formula (4A): where each R is indepen
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: May 29, 2018
    Assignees: Idemitsu Kosan Co., Ltd., Universal Display Corporation
    Inventors: Kazuki Nishimura, Toshihiro Iwakuma, Hitoshi Yamamoto, Michael S. Weaver, Julia J. Brown
  • Patent number: 9966541
    Abstract: An organic electroluminescence device utilizes a novel combination comprising one or more biscarbazole derivative compounds as the phosphorescent host material in combination with a green phosphorescent dopant material in the light emitting region of the device, where the biscarbazole derivative compounds are represented by a formula (1A) or (1B) below; where A1 represents a substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; A2 represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; X1 and X2 each are a linking group; Y1 to Y4 each represent a substituent; p and q represent an integer of 1 to 4; and r and s represent an integer of 1 to 3; and the green phosphorescent dopant material is a phosphorescent organometallic complex having a chemical structure represented by LL?L?M wherein M is a metal that forms octa
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: May 8, 2018
    Assignees: IDEMITSU KOSAN CO. LTD., UNIVERSAL DISPLAY CORPORATION
    Inventors: Hitoshi Yamamoto, Michael S. Weaver, Julia J. Brown, Kazuki Nishimura, Toshihiro Iwakuma
  • Publication number: 20180083205
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a n-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic, thin film layers contains the material for an organic electroluminescence device.
    Type: Application
    Filed: October 17, 2017
    Publication date: March 22, 2018
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki KATO, Masaki NUMATA, Kazuki NISHIMURA, Toshihiro IWAKUMA, Chishio HOSOKAWA
  • Publication number: 20180040835
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a n-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.
    Type: Application
    Filed: October 17, 2017
    Publication date: February 8, 2018
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki KATO, Masaki NUMATA, Kazuki NISHIMURA, Toshihiro IWAKUMA, Chishio HOSOKAWA
  • Patent number: 9847493
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a ?-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: December 19, 2017
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki Kato, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Patent number: 9842996
    Abstract: A compound represented by the following formula (1).
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: December 12, 2017
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Kei Yoshida, Toshihiro Iwakuma, Ryohei Hashimoto
  • Patent number: 9685614
    Abstract: A compound represented by the following formula (1):
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: June 20, 2017
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Toshihiro Iwakuma, Kazuki Nishimura
  • Patent number: 9660203
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a ?-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: May 23, 2017
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki Kato, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Publication number: 20170092877
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a ?-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.
    Type: Application
    Filed: December 14, 2016
    Publication date: March 30, 2017
    Inventors: Tomoki KATO, Masaki NUMATA, Kazuki NISHIMURA, Toshihiro IWAKUMA, Chishio HOSOKAWA
  • Patent number: 9601708
    Abstract: The OLEDs of the present invention are characterized by providing an organic thin film layer comprising a single layer or plural layers between a cathode and an anode, wherein the organic thin film layer comprises at least one organic light emitting layer, wherein at least one light emitting layer comprises at least one host material and at least one phosphorescent emitter material, wherein the host material comprises a bis-carbazole derivative host material; and the phosphorescent emitter material comprises a phosphorescent organometallic complex having a substituted chemical structure represented by one of the following partial chemical structures represented by the formula: LL?L?M wherein M is a metal that forms octahedral complexes, L, L?, L? are equivalent or inequivalent bidentate ligands wherein each L comprises a substituted or unsubstituted phenylpyridine ligand coordinated to M through an sp2 hybridized carbon and N; and one of L, L? and L? is inequivalent to at least one of the other two.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: March 21, 2017
    Assignees: Universal Display Corporation, Idemitsu Kosan Co., Ltd.
    Inventors: Hitoshi Yamamoto, Michael S. Weaver, Julia J. Brown, Kazuki Nishimura, Toshihiro Iwakuma, Tetsuya Inoue, Mitsunori Ito
  • Patent number: 9419231
    Abstract: An organic electroluminescence device including two or more organic thin film layers including an emitting layer between an anode and a cathode, the emitting layer including at least one compound represented by the following formula (1), and an organic thin film layer that is in contact with the emitting layer on the cathode side comprising at least one benzimidazole compound represented by the following formula (A):
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: August 16, 2016
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Kei Yoshida, Toshihiro Iwakuma, Hideaki Nagashima, Ryohei Hashimoto
  • Publication number: 20160163996
    Abstract: A compound that includes a structure including two or more structures represented by the following formula (1) in the same molecule and in which at least two of the structures represented by the formula (1) are directly bonded to each other by a single bond.
    Type: Application
    Filed: July 7, 2014
    Publication date: June 9, 2016
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Kei YOSHIDA, Toshihiro IWAKUMA, Ryohei HASHIMOTO
  • Publication number: 20160118602
    Abstract: Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a ?-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.
    Type: Application
    Filed: January 4, 2016
    Publication date: April 28, 2016
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki Kato, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Patent number: 9266851
    Abstract: A fluorene-containing aromatic compound represented by a formula (1) below. In the formula (1): Nr1 represents a substituted or unsubstituted monocyclic nitrogen-containing aromatic ring having 2 to 5 ring carbon atoms, or a bicyclic nitrogen-containing aromatic ring having 2 to 9 ring carbon atoms; Ar represents an aromatic ring and the like; Fl1 and Fl2 represent a fluorenyl group; and Cz1 and Cz2 represent a carbazolyl group. A compound represented by a formula (2) below is omitted from the fluorene-containing aromatic compound represented by the formula (1).
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: February 23, 2016
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Kei Yoshida, Kazuki Nishimura, Mitsunori Ito, Yuichiro Kawamura, Toshinari Ogiwara, Toshihiro Iwakuma
  • Patent number: RE46368
    Abstract: A material for electroluminescent devices which comprises a compound in which a heterocyclic group having nitrogen is bonded to carbazolyl group and an organic electroluminescent device having at least one organic thin film layer which is sandwiched between the cathode and the anode and contains the above material in at least one layer, are provided. The material can provide organic electroluminescent devices emitting bluish light with a high purity of color. The organic electroluminescence device uses the material.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: April 18, 2017
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Chishio Hosokawa, Hidetsugu Ikeda, Seiji Tomita, Takashi Arakane