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: 8106390
    Abstract: A metal complex compound having a special structure containing metals such as iridium. An organic electroluminescence device which comprises at least one organic thin film layer sandwiched between a pair of electrode consisting of an anode and a cathode, wherein the organic thin film layer comprises the above metal complex compound, which emits light by applying an electric voltage between the pair of electrode. An organic EL device employing the novel metal complex compound emits various phosphorous lights including blue light having an enhanced current efficiency and prolonged lifetime.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: January 31, 2012
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Fumio Okuda, Toshihiro Iwakuma, Keiko Yamamichi, Chishio Hosokawa
  • Patent number: 8105701
    Abstract: An organic EL device 100 including a plurality of emitting layers (15) and (17) between a cathode (18) and (19) and an anode (12), each of the emitting layers (15) and (17) made of a host material having a triplet energy gap of 2.52 eV or more and 3.7 eV or less, and a dopant having a light emitting property related to a triplet state, the dopant containing a metal complex with a heavy metal.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: January 31, 2012
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Masahide Matsuura, Chishio Hosokawa, Toshihiro Iwakuma, Keiko Yamamichi
  • Publication number: 20120007059
    Abstract: An organic electroluminescence device composed of a cathode, an anode, and an organic thin film layer between the cathode and the anode. The organic thin film layer includes one or more layers. At least one layer of the organic thin film layer is a light emitting layer and at least one light emitting layer contains a compound which is asymmetric with respect to the central benzene ring and a phosphorescent emitting material. The compound provides an organic electroluminescence device with long lifetime and high current efficiency.
    Type: Application
    Filed: December 24, 2009
    Publication date: January 12, 2012
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Toshihiro Iwakuma, Yoriyuki Takashima, Toshinari Ogiwara
  • Publication number: 20120001160
    Abstract: An organic electroluminescent device (1) including an anode (2), a cathode (6), and at least a first layer (3), a second layer (4), and a third layer (5) provided between the anode (2) and the cathode (6) in that order from the anode side. At least one of the first to third layers (3), (4), and (5) includes a phosphorescent compound. At least one of the first to third layers (3), (4), and (5) is an emitting layer. At least three compounds respectively forming the first layer (3), the second layer (4), and the third layer (5) other than the phosphorescent compound are compounds of the following formula (1). wherein R1 to R7 each represent a hydrogen atom or a substituent, provided that adjacent substituents may form a ring.
    Type: Application
    Filed: September 16, 2011
    Publication date: January 5, 2012
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Masahide Matsuura, Hideaki Nagashima, Hidetsugu Ikeda, Hiroaki Nakamura, Tadashi Kusumoto
  • Publication number: 20110315965
    Abstract: An organic electroluminescence device and a material for producing the organic electroluminescence device. The organic electroluminescence device includes an organic thin film layer between a cathode and an anode, the organic thin film layer including one or more layers, in which the organic thin film layer includes one or more light emitting layers and at least one of the light emitting layers includes a phosphorescent material and a host material. The host material has an essential structure in which a naphthalene ring is bonded to a fluorene skeleton, dibenzofuran skeleton, or dibenzothiophene skeleton. The organic electroluminescence device is a phosphorescent device having high efficiency and long lifetime.
    Type: Application
    Filed: December 22, 2009
    Publication date: December 29, 2011
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Yoriyuki Takashima, Toshihiro Iwakuma, Toshinari Ogiwara, Chishio Hosokawa, Mitsunori Ito
  • Publication number: 20110309337
    Abstract: An organic EL device includes: an anode (3); a cathode (4); and an organic thin-film layer (5) provided between the anode (3) and the cathode (4). The organic thin-film layer (5) includes: a fluorescent-emitting layer (51) containing a fluorescent host and a blue fluorescent dopant; a red phosphorescent-emitting layer (52) containing a red phosphorescent host and a red phosphorescent dopant; and a green phosphorescent-emitting layer (53) containing a green phosphorescent host and a green phosphorescent dopant. The red phosphorescent dopant emits light mainly by receiving transfer of triplet energy from the fluorescent host. The green phosphorescent dopant emits light mainly by recombination of charges within the green phosphorescent-emitting layer.
    Type: Application
    Filed: July 4, 2008
    Publication date: December 22, 2011
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Kazuki Nishimura, Toshihiro Iwakuma, Masahiro Kawamura, Kenichi Fukuoka, Chishio Hosokawa
  • Publication number: 20110309338
    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: Application
    Filed: July 7, 2011
    Publication date: December 22, 2011
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Chishio Hosokawa, Hidetsugu Ikeda, Seiji Tomita, Takashi Arakane
  • Patent number: 8080658
    Abstract: A material for organic electroluminescence devices for use as a host material in combination with at least one phosphorescent metal complex contains a compound represented by formula 1: wherein R1 to R10 are each independently hydrogen atom, halogen atom, alkyl group having 1 to 40 carbon atoms, cycloalkyl group having 3 to 15 carbon atoms, heterocyclic group having 3 to 20 carbon atoms which is optionally substituted, alkoxy group having 1 to 40 carbon atoms, non-condensed aryl group having 6 to 40 carbon atoms, condensed aryl group having 10 to 18 carbon atoms, aryloxy group having 6 to 20 carbon atoms, aralkyl group having 7 to 20 carbon atoms, arylamino group having 6 to 40 carbon atoms, alkylamino group having 1 to 40 carbon atoms, aralkylamino group having 7 to 60 carbon atoms, arylcarbonyl group having 7 to 40 carbon atoms, alkyl halide group having 1 to 40 carbon atoms, or cyano group, R8 and R9 being optionally bonded to each other to form a ring structure and each of R1 to R10 being optionally
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: December 20, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Jun Endo, Masaki Numata, Kenichi Fukuoka
  • Publication number: 20110303907
    Abstract: A material for organic electroluminescent devices including a 2,7-disubstituted naphthalene ring in its molecule and an organic electroluminescent device including an organic thin film layer having one or more layers between a cathode and an anode. An organic electroluminescence device having the organic thin film layer which includes the material for organic electroluminescent devices and at least one kind of phosphorescent emitting materials has long lifetime and high current efficiency.
    Type: Application
    Filed: December 25, 2009
    Publication date: December 15, 2011
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Toshihiro Iwakuma, Yoriyuki Takashima, Toshinari Ogiwara
  • Publication number: 20110291081
    Abstract: An organic EL device material includes at least a unit including 3,5-biscarbazolylphenyl group, a unit including 4-carbazolylphenyl group, and a compound including a unit including a nitrogen-containing aromatic heterocyclic ring bonding the unit including 3,5-biscarbazolylphenyl group and the unit including 4-carbazolylphenyl group.
    Type: Application
    Filed: March 4, 2011
    Publication date: December 1, 2011
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Tetsuya Inoue, Kumiko Hibino, Kei Yoshida, Kazuki Nishimura, Toshihiro Iwakuma
  • Patent number: 8057919
    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 of a specific structure having a n-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, or oxygen 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, 2008
    Date of Patent: November 15, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Tomoki Kato, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Patent number: 8049411
    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: October 17, 2008
    Date of Patent: November 1, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Tomoki Kato, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Publication number: 20110253995
    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: June 30, 2011
    Publication date: October 20, 2011
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Tomoki KATO, Masaki Numata, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa
  • Patent number: 8039129
    Abstract: An organic electroluminescence device includes: a cathode; an anode; and an organic thin-film layer including at least one layer and provided between the cathode and the anode. At least one layer of the organic thin-film layer includes: an organic-electroluminescence-device material represented by any one of the following formulae (1), (2) and (3); and at least one phosphorescent material, in which the organic-electroluminescence-device material may have a substituent. A or Ar may be substituted by a phenyl group or a naphthyl group.
    Type: Grant
    Filed: April 6, 2010
    Date of Patent: October 18, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Yoriyuki Takashima, Mitsunori Ito, Toshinari Ogiwara
  • Patent number: 8039121
    Abstract: An organic electroluminescent device (1) including an anode (2), a cathode (6), and at least a first layer (3), a second layer (4), and a third layer (5) provided between the anode (2) and the cathode (6) in that order from the anode side. At least one of the first to third layers (3), (4), and (5) includes a phosphorescent compound. At least one of the first to third layers (3), (4), and (5) is an emitting layer. At least three compounds respectively forming the first layer (3), the second layer (4), and the third layer (5) other than the phosphorescent compound are compounds of the following formula (1). wherein R1 to R7 each represent a hydrogen atom or a substituent, provided that adjacent substituents may form a ring.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: October 18, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Masahide Matsuura, Hideaki Nagashima, Hidetsugu Ikeda, Hiroaki Nakamura, Tadashi Kusumoto
  • Patent number: 8039127
    Abstract: An organic electroluminescence device includes: a cathode; an anode; and a single-layered or multilayered organic thin-film layer provided between the cathode and the anode. In the organic electroluminescence device, at least one layer of the organic thin-film layer includes: an organic-electroluminescence-device material represented by a general formula selected from the following formulae (1), (2) and (3); and at least one phosphorescent material. In the formula: A represents a group selected from a 3-fluoranthenyl group, 5-benzo[c]phenanthrenyl group, 6-benzo[c]phenanthrenyl group and 10-benzo[g]chrysenyl group; Ar represents a fused aromatic ring having 10 to 30 carbon atoms and having triplet energy of 2.10 eV or more; and A or Ar is allowed to be substituted by a phenyl group or a naphthyl group.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: October 18, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Yoriyuki Takashima, Mitsunori Ito, Toshinari Ogiwara
  • Publication number: 20110248250
    Abstract: The present invention provides an OLED in which an organic thin film layer comprising a single layer or plural layers is provided between a cathode and an anode, where the organic thin film layer comprises at least one light emitting layer, and the at least one light emitting layer comprises (a) a host material represented by the following Formula (1): Ra—Ar1—Ar2—Rb (1) where Ar1, Ar2, Ra and Rb represent a substituted or unsubstituted benzene ring or a condensed aromatic hydrocarbon group selected from a substituted or unsubstituted naphthalene ring, chrysene ring, a substituted or unsubstituted fluoranthene ring, triphenylene ring, a substituted or unsubstituted phenanthrene ring, a substituted or unsubstituted benzophenanthrene ring, a substituted or unsubstituted dibenzophenanthrene ring, a substituted or unsubstituted benzotriphenylene ring, a substituted or unsubstituted benzochrysene ring, a substituted or unsubstituted picene ring and a substituted or unsubstituted benzofluoranthene ring; and (b) at l
    Type: Application
    Filed: October 23, 2008
    Publication date: October 13, 2011
    Applicants: IDEMITSU KOSAN CO., LTD., UNIVERSAL DISPLAY CORPORATION
    Inventors: Brian D'Andrade, Julia J. Brown, Michael S. Weaver, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa, Masahiro Kawamura, Mitsunori Ito
  • Patent number: 8034256
    Abstract: A naphthalene derivative represented by the following formula (1) is provided. In the formula (1), Ar1 and Ar2 each represent an aromatic hydrocarbon cyclic group having 6 to 18 carbon atoms forming a ring. The aromatic hydrocarbon cyclic group has none of anthracene skeleton, pyrene skeleton, aceanthrylene skeleton and naphthacene skeleton. Ar3 represents a benzene skeleton or a naphthalene skeleton. R1 and R2 each represent an alkyl group, a cycloalkyl group, an alkoxy group, a cyano group, a silyl group or a halogen atom. a and b each represent an integer in a range of 0 to 4. m and n each represent an integer in a range of 1 to 4.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: October 11, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Masahiro Kawamura, Kazuki Nishimura, Yoriyuki Takashima, Mitsunori Ito, Toshihiro Iwakuma, Toshinari Ogiwara, Chishio Hosokawa, Kenichi Fukuoka
  • Patent number: 8035297
    Abstract: An organic electroluminescent device including in sequence an anode, a first emitting layer (5), a carrier barrier layer (6), a second emitting layer (7) and a cathode stacked; wherein the ionization potential of the carrier barrier layer (6) is more than the ionization potential of the first emitting layer (5) by 0.1 eV or more and the affinity level of the carrier barrier layer (6) is less than the affinity levels of the first emitting layer (5) and the second emitting layer (7) by 0.1 eV or more.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: October 11, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Takashi Arakane, Hitoshi Kuma, Hisayuki Kawamura, Toshihiro Iwakuma, Chishio Hosokawa
  • Patent number: 8029697
    Abstract: A naphthalene derivative represented by the following formula (1) is provided. In the formula (1), Ar1 to Ar6 each represent a substituted or unsubstituted aromatic hydrocarbon cyclic group having 6 to 18 carbon atoms forming a ring. The substituted or unsubstituted aromatic hydrocarbon cyclic group has none of anthracene skeleton, pyrene skeleton, aceanthrylene skeleton and naphthacene skeleton. R1 to R3 each represent an alkyl group, a cycloalkyl group, an alkoxy group, a cyano group, a silyl group or a halogen atom. R1 to R3 each may be bonded in any position of a main-chain naphthalene skeleton or a main-chain benzene skeleton. a and b each represent an integer in a range of 0 to 4. l, m, n and p each represent 0 or 1.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: October 4, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Masahiro Kawamura, Kazuki Nishimura, Yoriyuki Takashima, Mitsunori Ito, Toshihiro Iwakuma, Toshinari Ogiwara, Chishio Hosokawa, Kenichi Fukuoka