Patents by Inventor Yuta Sagara

Yuta Sagara 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).

  • Publication number: 20250171683
    Abstract: Provided are an emission material and an organic EL device including the emission material and having high emission efficiency and a long lifetime. An organic EL device comprising light emitting layers between an anode and a cathode opposite to each other; wherein at least one of the light emitting layers contains, as a light emitting dopant, a compound in which a backbone having a specific structure and a boron atom are combined, and the compound is represented by the following general formula (1) or the general formula (2).
    Type: Application
    Filed: January 30, 2023
    Publication date: May 29, 2025
    Applicants: NIPPON STEEL Chemical & Material Co., Ltd., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
    Inventors: Masashi TADA, Yuta SAGARA, Sayuri KITERA, Takuma YASUDA, Hyukgi MIN
  • Patent number: 12193324
    Abstract: Provided are an organic EL device having high luminous efficiency and a prolonged lifespan with a low driving voltage, and a melt mixture for an organic electroluminescent device used in the organic EL device. The melt mixture for an organic electroluminescent device is a melt mixture of at least two types of organic compounds including a first organic compound and a second organic compound, and a difference in vapor deposition temperature between the first organic compound and the second organic compound is 20° C. or less, and a difference between a PL maximum emission wavelength of the melt mixture and a PL maximum emission wavelength of any of the first organic compound and the second organic compound is within ±10 nm. The melt mixture is suitable as a host material of a light-emitting layer.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: January 7, 2025
    Assignee: NIPPON STEEL Chemical & Material Co., Ltd.
    Inventors: Masashi Tada, Yuta Sagara
  • Patent number: 12185624
    Abstract: Provided is a thermally activated delayed fluorescent blue light-emitting organic EL device having high luminous efficiency and a long lifetime. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting layers contains an indolocarbazole compound represented by the following general formula (1), which serves as a thermally activated delayed fluorescent light-emitting material, and a carbazole compound serving as a host material, and a substituent Ar2 with which a N atom in the indolocarbazole ring compound is substituted has at least one fluorine atom.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: December 31, 2024
    Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Masashi Tada, Yuta Sagara, Munetomo Inoue
  • Publication number: 20240298539
    Abstract: To provide an organic EL device having a low voltage, high efficiency and extended lifetime characteristics, and a host material for use in the organic EL device. A host material for an organic EL device, including a compound represented by the following general formula (1), or a structural isomer thereof: wherein X represents N or C—H and at least one thereof represents N, L independently represents an aromatic hydrocarbon group, and R2 to R6 represent hydrogen, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, an aromatic heterocyclic group, or a linked aromatic group in which two to five of these aromatic rings are linked to each other, provided that R2 and at least one of others do not represent hydrogen.
    Type: Application
    Filed: July 27, 2022
    Publication date: September 5, 2024
    Applicant: NIPPON STEEL Chemical & Material Co., Ltd.
    Inventors: Kentaro HAYASHI, Yuta SAGARA, Junya OGAWA, Yuji IKENAGA, Munetomo INOUE, Satoshi UKIGAI, Sayuri KITERA, Tetsuro YAMASHITA, Masataka OKUYAMA, Mitsuru SAKAI
  • Publication number: 20230371375
    Abstract: Provided are an emission material and an organic EL device including the emission material and having high emission efficiency and a long lifetime. An organic EL device comprising light emitting layers between an anode and a cathode opposite to each other; wherein at least one of the light emitting layers contains, as a light emitting dopant, a compound in which a backbone having a specific 5-ring-fused ring structure, and a boron atom are combined, and the compound is represented by the following general formula (1).
    Type: Application
    Filed: October 15, 2021
    Publication date: November 16, 2023
    Applicants: NIPPON STEEL Chemical & Material Co., Ltd., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
    Inventors: Masashi TADA, Atsushi KAWADA, Yuta SAGARA, Sayuri KITERA, Takuma YASUDA, Hyukgi MIN, In Seob PARK
  • Patent number: 11818950
    Abstract: Provided is a thermally activated delayed fluorescent organic electroluminescent device having a low driving voltage, high luminous efficiency, and a long lifetime. The organic electroluminescent device includes light-emitting layers between an anode and a cathode opposite to each other, and at least one of the light-emitting layers contains a thermally activated delayed fluorescent material, or the thermally activated delayed fluorescent material and a host material. The thermally activated delayed fluorescent material is represented by the following general formula (1) where A represents an electron-withdrawing group, such as a CN group, and D1 and D2 each represent an electron-donating group having an indole ring structure.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: November 14, 2023
    Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Masashi Tada, Kazuaki Yoshimura, Atsushi Kawada, Katsuhide Noguchi, Yuta Sagara, Junya Ogawa
  • Publication number: 20230309400
    Abstract: Provided is a thermally activated delayed fluorescence organic EL device having high emission efficiency and a long lifetime. An organic EL device comprising light emitting layers between an anode and a cathode opposite to each other; wherein at least one of the light emitting layers contains, as a thermally activated delayed fluorescence material, a compound in which a boron-containing electron acceptor backbone is linked with an electron donor backbone having a specific fused ring structure; and the compound is represented by the following general formula (1) where X1 is O or S.
    Type: Application
    Filed: July 6, 2021
    Publication date: September 28, 2023
    Applicants: NIPPON STEEL Chemical & Material Co., Ltd., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
    Inventors: Masashi TADA, Yuta SAGARA, Atsushi KAWADA, Takuma YASUDA, In Seob PARK, Jong Uk KIM, So SHIKITA
  • Publication number: 20230136708
    Abstract: Provided is a blue light emitting organic EL device having high emission efficiency and a long lifetime. This organic electroluminescent device includes one or more light emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light emitting layers comprises one or more hosts selected from the indolocarbazole compounds represented by the following general formula (1) and, as a light emitting dopant, a polycyclic aromatic compound represented by the following general formula (2) or a polycyclic aromatic compound having the structure represented by the general formula (2) as a substructure, and wherein in the formulae Z is an indolocarbazole ring-containing group, X1 is O, N—Ar3, S, or Se, and Y1 is B, P, P?O, P?S, Al, Ga, As, Si—R2 or Ge—R3.
    Type: Application
    Filed: March 19, 2021
    Publication date: May 4, 2023
    Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Munetomo INOUE, Masashi TADA, Yuta SAGARA, Ayaka TERADA
  • Publication number: 20230139757
    Abstract: Provided is a blue light emitting organic EL device having high emission efficiency and a long lifetime. This organic EL device comprises one or more light emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light emitting layers contains a first host, a second host, and a light emitting dopant; the first host is a carbazole compound or a bicarbazole compound; the second host is an indolocarbazole compound; and the light emitting dopant is a polycyclic aromatic compound represented by the general formula (4) or a polycyclic aromatic compound having this structure as a partial structure. In the formula, Y4 is B, P, P?O, P?S, AL, Ga, As, Si—R4, or Ge—R41, and X4 is O, N—Ar4, S, or Se.
    Type: Application
    Filed: March 19, 2021
    Publication date: May 4, 2023
    Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Masashi TADA, Munetomo INOUE, Ayaka TERADA, Yuta SAGARA
  • Patent number: 11374178
    Abstract: Provided is a thermally activated delayed fluorescence-emitting organic EL element having a low driving voltage, high luminous efficiency, and a prolonged lifespan. The organic EL element contains one or more light-emitting layers between an anode and a cathode that face each other, and at least one light-emitting layer contains a host material composed of a carbazole compound represented by formula (1) and a thermally activated delayed fluorescence material composed of an indolocarbazole compound containing an indolocarbazole ring in its molecule. Here, L1 represents an aromatic group, and at least one R1 represents a carbazolyl group, and n is 1 or 2.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: June 28, 2022
    Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Yuta Sagara, Masashi Tada, Kazuaki Yoshimura, Junya Ogawa, Katsuhide Noguchi
  • Publication number: 20220173326
    Abstract: Provided are an organic EL device having high luminous efficiency and a prolonged lifespan with a low driving voltage, and a melt mixture for an organic electroluminescent device used in the organic EL device. The melt mixture for an organic electroluminescent device is a melt mixture of at least two types of organic compounds including a first organic compound and a second organic compound, and a difference in vapor deposition temperature between the first organic compound and the second organic compound is 20° C. or less, and a difference between a PL maximum emission wavelength of the melt mixture and a PL maximum emission wavelength of any of the first organic compound and the second organic compound is within ±10 nm. The melt mixture is suitable as a host material of a light-emitting layer.
    Type: Application
    Filed: March 13, 2020
    Publication date: June 2, 2022
    Applicant: NIPPON STEEL Chemical & Material Co., Ltd.
    Inventors: Masashi TADA, Yuta SAGARA
  • Publication number: 20210119144
    Abstract: Provided is a thermally activated delayed fluorescent emission-type organic electroluminescent device (organic EL device) having a low driving voltage, high luminous efficiency, and a long lifetime. The organic EL device is a delayed fluorescent emission-type organic EL device including one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting layers contains a para-biphenylcarbazole compound-type host material represented by the general formula (1), and an indolocarbazole compound-type thermally activated delayed fluorescent light-emitting material including an indolocarbazole ring in a molecule thereof.
    Type: Application
    Filed: March 4, 2019
    Publication date: April 22, 2021
    Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Yuta SAGARA, Masashi TADA
  • Publication number: 20200411770
    Abstract: Provided is a thermally activated delayed fluorescent blue light-emitting organic EL device having high luminous efficiency and a long lifetime. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting layers contains an indolocarbazole compound represented by the following general formula (1), which serves as a thermally activated delayed fluorescent light-emitting material, and a carbazole compound serving as a host material, and a substituent Ar2 with which a N atom in the indolocarbazole ring compound is substituted has at least one fluorine atom.
    Type: Application
    Filed: February 13, 2019
    Publication date: December 31, 2020
    Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Masashi TADA, Yuta SAGARA, Munetomo INOUE
  • Publication number: 20200006672
    Abstract: Provided is a thermally activated delayed fluorescence-emitting organic EL element having a low driving voltage, high luminous efficiency, and a prolonged lifespan. The organic EL element contains one or more light-emitting layers between an anode and a cathode that face each other, and at least one light-emitting layer contains a host material composed of a carbazole compound represented by formula (1) and a thermally activated delayed fluorescence material composed of an indolocarbazole compound containing an indolocarbazole ring in its molecule. Here, L1 represents an aromatic group, and at least one R1 represents a carbazolyl group, and n is 1 or 2.
    Type: Application
    Filed: February 20, 2018
    Publication date: January 2, 2020
    Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
    Inventors: Yuta SAGARA, Masashi TADA, Kazuaki YOSHIMURA, Junya OGAWA, Katsuhide NOGUCHI
  • Patent number: 10453638
    Abstract: An overcurrent tripping device includes a tripping conductor connected to the main circuit; a fixed core inside which the tripping conductor penetrates and which is excited by current flowing through the tripping conductor; a movable core which is arranged to be opposed to the fixed core with a magnetic gap therebetween, and which forms a magnetic circuit in cooperation with the fixed core, and moves by being attracted by the fixed core when overcurrent flows through the tripping conductor; and a shaft fixed to the movable core to guide the movement of the movable core, and linked to the tripping mechanism of the circuit breaker, wherein the fixed core has a narrow gap formed in such a direction as to cross the magnetic circuit, so that magnetic saturation is suppressed by the narrow gap.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: October 22, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi Sasaki, Yuta Sagara
  • Publication number: 20180366656
    Abstract: Provided is a thermally activated delayed fluorescent organic electroluminescent device having a low driving voltage, high luminous efficiency, and a long lifetime. The organic electroluminescent device includes light-emitting layers between an anode and a cathode opposite to each other, and at least one of the light-emitting layers contains a thermally activated delayed fluorescent material, or the thermally activated delayed fluorescent material and a host material. The thermally activated delayed fluorescent material is represented by the following general formula (1) where A represents an electron-withdrawing group, such as a CN group, and D1 and D2 each represent an electron-donating group having an indole ring structure.
    Type: Application
    Filed: November 28, 2016
    Publication date: December 20, 2018
    Inventors: Masashi Tada, Kazuaki Yoshimura, Atsushi Kawada, Katsuhide Noguchi, Yuta Sagara, Junya Ogawa
  • Publication number: 20180012720
    Abstract: An overcurrent tripping device includes a tripping conductor connected to the main circuit; a fixed core inside which the tripping conductor penetrates and which is excited by current flowing through the tripping conductor; a movable core which is arranged to be opposed to the fixed core with a magnetic gap therebetween, and which forms a magnetic circuit in cooperation with the fixed core, and moves by being attracted by the fixed core when overcurrent flows through the tripping conductor; and a shaft fixed to the movable core to guide the movement of the movable core, and linked to the tripping mechanism of the circuit breaker, wherein the fixed core has a narrow gap formed in such a direction as to cross the magnetic circuit, so that magnetic saturation is suppressed by the narrow gap.
    Type: Application
    Filed: June 13, 2016
    Publication date: January 11, 2018
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi SASAKI, Yuta SAGARA
  • Patent number: 9793492
    Abstract: A compound represented by D-A-D is useful as a light emitter for an organic electroluminescent device:
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: October 17, 2017
    Assignees: KYUSHU UNIVERSITY NATIONAL UNIVERSITY CORPORATION, NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.
    Inventors: Yuta Sagara, Hiroyuki Tanaka, Katsuyuki Shizu, Hiroshi Miyazaki, Chihaya Adachi
  • Publication number: 20160005978
    Abstract: A compound represented by D-A-D is useful as a light emitter for an organic electroluminescent device:
    Type: Application
    Filed: February 14, 2014
    Publication date: January 7, 2016
    Inventors: Yuta SAGARA, Hiroyuki TANAKA, Katsuyuki SHIZU, Hiroshi MIYAZAKI, Chihaya ADACHI
  • Publication number: 20150239880
    Abstract: To provide a material useful as a light emitting material of an organic light emitting device. A light emitting material comprising a compound represented by the general formula (1) wherein X represents O, S, N—R11, C?O, C(R12)(R13), or Si(R14)(R15); Y represents O, S, or N—R16; Ar1 represents a substituted or unsubstituted arylene group, and Ar2 represents an aromatic ring or a heteroaromatic ring; and R1 to R8 and R11 to R16 each independently represent a hydrogen atom or a substituent.
    Type: Application
    Filed: August 23, 2013
    Publication date: August 27, 2015
    Inventors: Chihaya Adachi, Katsuyuki Shizu, Yuta Sagara