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).

  • Naphthalene derivative, material for organic electroluminescence device, and organic electroluminescence device using the same
    Patent number: 8025815
    Abstract: A naphthalene derivative represented by the following formula (1) is provided. In the formula, Ar1 to Ar4 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. n, m and l each represent an integer in a range of 1 to 5. p represents an integer in a range of 0 to 5. When n, m, l and p each are 2 or more, a plurality of Ar1 to Ar4 may be mutually the same or different.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: September 27, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Masahiro Kawamura, Kazuki Nishimura, Yoriyuki Takashima, Mitsunori Ito, Toshihiro Iwakuma, Toshinari Ogiwara, Chishio Hosokawa, Kenichi Fukuoka
  • Naphthalene derivative, material for organic electroluminescence device, and organic electroluminescence device using the same
    Patent number: 8021574
    Abstract: A naphthalene derivative represented by the following formula (1) is provided. In the formula, Ar1 to Ar4 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. n, m and l each represent an integer in a range of 1 to 5. p represents an integer in a range of 0 to 5. When n, m, l and p each are 2 or more, a plurality of Ar1 to Ar4 may be mutually the same or different.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: September 20, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Masahiro Kawamura, Kazuki Nishimura, Yoriyuki Takashima, Mitsunori Ito, Toshihiro Iwakuma, Toshinari Ogiwara, Chishio Hosokawa, Kenichi Fukuoka
  • Material for organic electroluminescent devices and organic electroluminescent devices made by using the same
    Patent number: 7990046
    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: March 13, 2003
    Date of Patent: August 2, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Chishio Hosokawa, Hidetsugu Ikeda, Seiji Tomita, Takashi Arakane
  • Material for organic electroluminescence device and organic electroluminescence device utilizing the same
    Patent number: 7968213
    Abstract: A material for organic electroluminescence devices of the invention which is for use in combination with at least one phosphorescent metal complex has a specific heterocyclic structure. The material for organic electroluminescence devices is used as a host material or a hole transporting material. An organic electroluminescence device having an anode, a cathode and an organic thin film layer having one or more layers which is interposed between the anode and cathode, in which at least one layer of the organic thin film layer contains the material for organic electroluminescence devices, has a high emitting efficiency, causes little pixel defects, is excellent in heat resistance, and shows a long lifetime.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: June 28, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Jun Endo, Masaki Numata, Kenichi Fukuoka
  • ORGANIC ELECTROLUMINESCENT DEVICE
    Publication number: 20110121277
    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: Application
    Filed: February 3, 2011
    Publication date: May 26, 2011
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Masahide MATSUURA, Chishio HOSOKAWA, Toshihiro IWAKUMA, Keiko YAMAMICHI
  • Material for organic electroluminescent device and organic electroluminescent device using same
    Patent number: 7939183
    Abstract: Provided is a material for an organic electroluminescence device, which is composed of a compound having a specific structure; and is capable of providing an organic electroluminescence device having a high luminous efficiency, excellent heat resistance, and a long lifetime while having no pixel defects, and an organic electroluminescence device using the same. The organic electroluminescence device comprises an organic thin film layer composed of one or more layers including at least a light-emitting layer and sandwiched between a cathode and an anode. In the organic electroluminescence device, at least one layer of the organic thin film layer comprises the material for an organic electroluminescence device.
    Type: Grant
    Filed: December 24, 2004
    Date of Patent: May 10, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Hisayuki Kawamura, Hidetsugu Ikeda, Chishio Hosokawa, Takashi Arakane, Hiroaki Nakamura
  • Organic electroluminescent device
    Patent number: 7906226
    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 8, 2005
    Date of Patent: March 15, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Masahide Matsuura, Chishio Hosokawa, Toshihiro Iwakuma, Keiko Yamamichi
  • Organic electroluminescent device and display having multiple emitting layers
    Patent number: 7888865
    Abstract: An organic electroluminescent device including at least an anode, a first emitting layer, a hole barrier layer, a second emitting layer and a cathode in this order. The first emitting layer and the second emitting layer both include a hole transporting material. The organic EL device is small in chromaticity change and has high efficiency.
    Type: Grant
    Filed: February 15, 2005
    Date of Patent: February 15, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Masahide Matsuura, Hiroshi Yamamoto, Hisayuki Kawamura, Chishio Hosokawa
  • Metal complex compound and organic electroluminescent device using same
    Publication number: 20110017984
    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: Application
    Filed: September 30, 2010
    Publication date: January 27, 2011
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Fumio Okuda, Toshihiro Iwakuma, Keiko Yamamichi, Chishio Hosokawa
  • ORGANIC EL ELEMENT AND SOLUTION CONTAINING ORGANIC EL MATERIAL
    Publication number: 20110001130
    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.
    Type: Application
    Filed: November 21, 2008
    Publication date: January 6, 2011
    Inventors: Kazuki Nishimura, Toshihiro Iwakuma, Kenichi Fukuoka, Chishio Hosokawa
  • PHENANTHRENE DERIVATIVE, AND MATERIAL FOR ORGANIC EL ELEMENT
    Publication number: 20100331585
    Abstract: A phenanthrene derivative is represented by a formula (1) below. In the formula (1), Ar1 and Ar2 each represent an aromatic hydrocarbon ring group having 6 to 18 carbon atoms for forming the ring. The aromatic hydrocarbon ring group contains none of anthracene skeleton, pyrene skeleton, aceanthrylene skeleton and naphthacene skeleton. R1 represents a substituent, the number of which may be 0, 1 or more. R1 may be bonded in any position of the phenanthrene skeleton. n and m each represent an integer of 1 to 3. k represents an integer of 0 to 8.
    Type: Application
    Filed: July 4, 2008
    Publication date: December 30, 2010
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Masahiro Kawamura, Kazuki Nishimura, Yoriyuki Takashima, Mitsunori Ito, Toshihiro Iwakuma, Toshinari Ogiwara
  • PHENANTHRENE DERIVATIVE, AND MATERIAL FOR ORGANIC EL ELEMENT
    Publication number: 20100327230
    Abstract: A phenanthrene derivative is represented by a formula (1) below. In the formula (1), Ar1 to Ar4 each represent an aromatic hydrocarbon ring group having 6 to 18 carbon atoms for forming the ring. The aromatic hydrocarbon ring group contains none of anthracene skeleton, pyrene skeleton, aceanthrylene skeleton and naphthacene skeleton. L represents a single bond, a substituted or unsubstituted benzene skeleton, naphthalene skeleton, biphenylene skeleton, fluorene skeleton, phenanthrene skeleton, fluoranthene skeleton, triphenylene skeleton, chrysene skeleton, phenyl-naphthalene skeleton or binaphthalene skeleton. R1 and R2 each represent a substituent, the number of which may be 0, 1 or more. R1 and R2 may be bonded in any positions of the phenanthrene skeleton. m, n, l and p each represent 0 or 1 while satisfying m+n+l+p?1 (m,n?l,p). a and b each represent an integer of 0 to 8.
    Type: Application
    Filed: July 4, 2008
    Publication date: December 30, 2010
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Masahiro Kawamura, Kazuki Nishimura, Yoriyuki Takashima, Mitsunori Ito, Toshihiro Iwakuma, Toshinari Ogiwara
  • Material for organic electroluminescence device and electroluminescence device employing the same
    Patent number: 7846560
    Abstract: A material for organic electroluminescence devices comprising a compound having a specific structure and an organic electroluminescence device comprising an organic thin film layer which comprises one layer or a plurality of layers comprising at least a light emitting layer and disposed between a cathode and an anode, wherein at least one layer in the organic thin film layer comprises the material for organic electroluminescence devices, are provided. The material provides the organic electroluminescence device exhibiting a great efficiency of light emission, having no defect pixels, exhibiting excellent heat resistance and having a long life.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: December 7, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Yuki Nakano, Masahide Matsuura, Hidetsugu Ikeda, Toshihiro Iwakuma
  • ORGANIC EL ELEMENT
    Publication number: 20100283043
    Abstract: An organic electroluminescence device includes an anode, a cathode, and an organic thin-film layer interposed between the anode and the cathode. The organic thin-film layer includes a phosphorescent-emitting layer containing a host and a phosphorescent dopant, and an electron transporting layer that is provided closer to the cathode than the phosphorescent-emitting layer. The host contains a substituted or unsubstituted polycyclic fused aromatic skeleton.
    Type: Application
    Filed: November 21, 2008
    Publication date: November 11, 2010
    Inventors: Kazuki Nishimura, Toshihiro Iwakuma, Kenichi Fukuoka, Chishio Hosokawa, Jun Endo, Nobuhiro Yabunouchi, Hiroshi Yamamoto
  • Material for organic electroluminescent device and organic electroluminescent device using same
    Patent number: 7829204
    Abstract: A material for organic electroluminescence device with specific structure having poor symmetry. An an organic electroluminescence device comprising a cathode, an anode and an organic thin film layer which is sandwiched between the cathode and the anode and comprises at least one layer, wherein at least one layer in the organic thin film layer contains a material for the organic electroluminescence device described above. An organic electroluminescence device with excellent efficiency of light emission, without pixel defects and which is superior in heat resistance is obtained.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: November 9, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro Iwakuma, Seiji Tomita, Mitsunori Ito
  • ORGANIC EL ELEMENT AND ORGANIC EL MATERIAL-CONTAINING SOLUTION
    Publication number: 20100270539
    Abstract: An organic EL device (1) 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 single-layered mixed-color emitting layer (51) for providing mixed-color emission. The mixed-color emitting layer (51) contains a host, a fluorescent dopant for blue fluorescent emission and a phosphorescent dopant for red or green phosphorescent emission.
    Type: Application
    Filed: July 4, 2008
    Publication date: October 28, 2010
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Kazuki Nishimura, Chishio Hosokawa, Toshihiro Iwakuma, Kenichi Fukuoka, Tetsuya Inoue
  • ORGANIC ELECTROLUMINESCENCE DEVICE AND MATERIAL FOR ORGANIC ELECTROLUMINESCENCE DEVICE
    Publication number: 20100258791
    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: Application
    Filed: April 6, 2010
    Publication date: October 14, 2010
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro IWAKUMA, Yoriyuki Takashima, Mitsunori Ito, Toshinari Ogiwara
  • COMPOSITE ORGANIC ELECTROLUMINESCENT MATERIAL AND PRODUCTION METHOD THEREOF
    Publication number: 20100258767
    Abstract: A composite organic EL material suited to flash deposition and a method for producing the same are provided. A composite organic electroluminescence material in which an organic material and an organic metal complex are combined with each other, wherein the melting point of the organic material is lower by 30° C. or more than the decomposition temperature of the organic metal complex.
    Type: Application
    Filed: April 13, 2009
    Publication date: October 14, 2010
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Hidehiro MATSUNAMI, Yasunori Kadoi, Chishio Hosokawa, Yoshikazu Tanaka, Toshihiro Iwakuma, Atau Ioku
  • ORGANIC ELECTROLUMINESCENCE DEVICE AND MATERIAL FOR ORGANIC ELECTROLUMINESCENCE DEVICE
    Publication number: 20100253211
    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: Application
    Filed: April 22, 2009
    Publication date: October 7, 2010
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Toshihiro IWAKUMA, Yoriyuki TAKASHIMA, Mitsunori ITO, Toshinari OGIWARA
  • ORGANIC EL DEVICE
    Publication number: 20100219404
    Abstract: An organic EL device includes: an anode, a cathode and an organic thin-film layer interposed between the anode and the cathode, in which the organic thin-film layer includes: an emitting layer containing a host material and a phosphorescent material; and a hole transporting layer provided adjacent to the anode relative to the emitting layer. The hole transporting layer includes a first hole transporting layer and a second hole transporting layer that are sequentially layered on the anode, in which the first hole transporting layer contains an amino compound substituted by an aromatic substituent represented by a formula (1) below and the second hole transporting layer contains at least one of compounds represented by formulae (2) to (5) below.
    Type: Application
    Filed: September 26, 2008
    Publication date: September 2, 2010
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Jun Endo, Kenichi Fukuoka, Toshihiro Iwakuma, Chishio Hosokawa, Tadahiko Yoshinaga, Emiko Kambe, Yasunori Kijima