Patents by Inventor Takahiro Kai
Takahiro Kai 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).
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Publication number: 20230284526Abstract: To provide an organic electroluminescent device having long lifetime characteristics while having a low driving voltage and high power efficiency. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposed to each other, wherein at least one of the light-emitting layers contains a host material including a first host material, a second host material and a third host material, and a light-emitting dopant material. A LUMO energy of the first host material is ?1.95 eV or less, and LM2?LM3?LM1 is satisfied under the assumption that LUMO energies of the first host material, the second host material and the third host material are LM1, LM2 and LM3, respectively.Type: ApplicationFiled: June 29, 2021Publication date: September 7, 2023Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Takahiro KAI, Kentaro HAYASHI, Junya OGAWA, Yuji IKENAGA, Ayaka TERADA, Kazunari YOSHIDA, Ikumi KITAHARA, Haruka IZUMI, Katsuhide NOGUCHI, Atsushi KAWADA
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Publication number: 20230142222Abstract: To provide an organic EL device having high efficiency and extended lifetime while having a low driving voltage, and a compound suitable therefor. A material for an organic electroluminescent device of the present invention is comprised of an indolocarbazole compound represented by the following general formula (1): wherein a ring A is a heterocycle represented by formula (1a); Ar1 and Ar2 each represent 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; L1 represents an aromatic hydrocarbon group or an aromatic heterocyclic group; L2 represents an aromatic heterocyclic group; Ar3 represents a carbazolyl group; and a+b+c?1.Type: ApplicationFiled: April 16, 2021Publication date: May 11, 2023Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Yuji IKENAGA, Takahiro KAI, Kazunari YOSHIDA, Kentaro HAYASHI
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Publication number: 20230128732Abstract: To provide an organic EL device having high efficiency and extended lifetime while having a low driving voltage, and a material for an organic electroluminescent device suitable therefor. This material for an organic electroluminescent device is comprised of an indolocarbazole compound represented by the following general formula (1): [C1] wherein a ring A is a heterocycle represented by formula (1a); Ar1 and Ar2 each represent an aromatic hydrocarbon group, an aromatic heterocyclic group, or a linked aromatic group; L2 represents an aromatic heterocyclic group; Ar3 represents an aromatic hydrocarbon group or a linked aromatic group in which a plurality of these aromatic hydrocarbon groups are linked to each other; and a+b+c?1.Type: ApplicationFiled: April 16, 2021Publication date: April 27, 2023Applicant: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Yuji IKENAGA, Takahiro KAI, Kazunari YOSHIDA, Kentaro HAYASHI
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Publication number: 20230113101Abstract: To provide an organic electroluminescent device having high efficiency while having a driving voltage. This organic electroluminescent device includes an anode, an organic layer and a cathode stacked on a substrate, at least one layer of the organic layer is a light-emitting layer containing a first host, a second host and a light-emitting dopant material, the first host is selected from a compound represented by the following general formula (1), and the second host is selected from a biscarbazole compound binding at a position other than the N-position, an indolocarbazole compound, or a carbazole compound in which a plurality of carbazole rings bind at the N-position. In the formula, a ring A is represented by formula (1b) or (1c), X represents NR, S, O, or CR2, and at least one Y represents N.Type: ApplicationFiled: December 11, 2020Publication date: April 13, 2023Applicant: NIPPON STEEL Chemical & Material Co., Ltd.Inventors: Junya OGAWA, Masashi TADA, Takahiro KAI, Kazunari YOSHIDA, Ikumi KITAHARA
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Patent number: 11600786Abstract: Provided is an organic EL device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other. At least one of the light-emitting layers contains a host material and a light-emitting dopant, and (i) a first host formed of an indolocarbazole compound having one or two indolocarbazole rings, and (ii) a second host formed of a carbazole compound having a plurality of carbazole rings and having a bond structure represented by the following general formula (3) are used as the host material.Type: GrantFiled: March 3, 2016Date of Patent: March 7, 2023Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Junya Ogawa, Takahiro Kai, Masanori Hotta, Yuji Ikenaga, Mitsuru Sakai, Masashi Tada, Tokiko Ueda, Katsuhide Noguchi
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Publication number: 20220348557Abstract: To provide an organic electroluminescent device having high efficiency and high driving stability while having a low driving voltage. The organic electroluminescent device has one or more light-emitting layers between an anode and a cathode opposed to each other, wherein at least one of the light-emitting layers is a light-emitting layer composed of a vapor deposition layer containing a first host, a second host and a light-emitting dopant material; the first host is selected from oligopyridine compounds represented by the general formula (1); and the second host is selected from carbazole compounds having two or more carbazole rings, indolocarbazole compounds having an indolocarbazole ring or compounds having a carbazole ring and an indolocarbazole ring.Type: ApplicationFiled: September 16, 2020Publication date: November 3, 2022Applicant: NIPPON STEEL Chemical & Material Co., Ltd.Inventors: Junya OGAWA, Takahiro KAI, Masashi TADA, Kazunari YOSHIDA
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Patent number: 10807996Abstract: Provided are an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple construction, and a material for an organic EL device to be used in the device. The material for an organic EL device includes a carborane compound represented by the general formula (1), and the carborane compound has a structure in which a six-membered ring group containing at least two nitrogen atoms is bonded to a carborane ring. The material for an organic EL device is suitable as a host material for a light-emitting layer containing a phosphorescent light-emitting dopant and the host material, or as a material for a hole-blocking layer. In the formula, rings A's each represent a divalent carborane group represented by the formula (1a) or the formula (1b), and two or more of X's each represent N.Type: GrantFiled: March 8, 2016Date of Patent: October 20, 2020Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Tokiko Ueda, Junya Ogawa, Takahiro Kai, Masashi Tada
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Patent number: 10636981Abstract: Provided are a material for an organic EL device that improves the luminous efficacy of a device, sufficiently secures its driving stability, and has a simple construction, and an organic EL device using the material. The material for an organic EL device is formed of a carborane compound having a structure in which a dibenzofuranyl group is bonded to a carborane ring. In addition, the material for an organic EL device is preferably used in a light-emitting layer, an electron-transporting layer, or a hole-blocking layer of an organic electroluminescent device having the light-emitting layer between an anode and a cathode laminated on a substrate. Also disclosed is an organic electroluminescent device using the material for an organic EL device as a host material for a light-emitting layer containing a phosphorescent light-emitting dopant and the host material.Type: GrantFiled: August 25, 2014Date of Patent: April 28, 2020Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Junya Ogawa, Masashi Tada, Tokiko Ueda, Takahiro Kai
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Patent number: 10529932Abstract: Disclosed are an organic electroluminescent device that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple construction, and a material to be used in the device. The material is a material for an organic electroluminescent device formed of a carborane ring compound having a structure in which two indolocarbazole groups are each bonded to a carborane ring through an aromatic group. In addition, the device is an organic electroluminescent device having organic layers between an anode and a cathode laminated on a substrate, in which at least one layer of the organic layers contains the material for an organic electroluminescent device. When the organic layer is a light-emitting layer, the layer contains a phosphorescent light-emitting dopant and contains the material for an organic electroluminescent device as a host material.Type: GrantFiled: February 26, 2015Date of Patent: January 7, 2020Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Junya Ogawa, Takahiro Kai, Tokiko Ueda, Masashi Tada, Masaki Komori, Toshihiro Yamamoto
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Patent number: 10468608Abstract: Provided are an organic EL device having high efficiency and high driving stability, and a compound suitable for the device. Provided is a material for an organic electroluminescent device formed of a carborane compound having a structure in which: one or two boron atoms of a carborane ring C2B10H12 are substituted with an aromatic hydrocarbon group or an aromatic heterocyclic group; and the two carbon atoms of the carborane ring are each bonded to an aromatic hydrocarbon group or an aromatic heterocyclic group, or are each bonded to any other carborane ring when a plurality of carborane rings are present. Also provided is an organic electroluminescent device in which the material for an organic electroluminescent device is used in a light-emitting layer, an electron-transporting layer, or a hole-blocking layer.Type: GrantFiled: March 17, 2016Date of Patent: November 5, 2019Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Junya Ogawa, Tokiko Ueda, Masashi Tada, Takahiro Kai
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Patent number: 10446767Abstract: Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple construction. The device is an organic electroluminescent device having organic layers including a light-emitting layer between an anode and a cathode laminated on a substrate, in which a carborane compound is incorporated into at least one layer of the organic layers, or is incorporated as a host material into a light-emitting layer containing a phosphorescent light-emitting dopant and the host material. The carborane compound has a structure in which a N-containing fused aromatic ring is bonded to a carborane ring. The N-containing fused aromatic ring is a quinoline ring or has a structure obtained by substituting 1 to 3 ring-forming carbon atoms in a quinoline ring with N atoms.Type: GrantFiled: February 23, 2015Date of Patent: October 15, 2019Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Tokiko Ueda, Junya Ogawa, Takahiro Kai, Masashi Tada
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Patent number: 10411198Abstract: The present invention discloses an organic electroluminescent (EL) device having improved luminous efficiency, sufficiently secured driving stability, and a simple construction. The organic EL device of the present invention includes, between an anode and a cathode laminated on a substrate, an organic layer including a material for a luminescent device, in which the material for a luminescent device includes a carborane compound. The carborane compound includes a branched carborane compound in which three or more carborane rings bonded to one another through an aromatic group are present, at least one dibenzothiophene ring is present, and the at least one dibenzothiophene ring is bonded to the carborane ring.Type: GrantFiled: November 18, 2014Date of Patent: September 10, 2019Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Junya Ogawa, Masashi Tada, Tokiko Ueda, Takahiro Kai
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Patent number: 10361378Abstract: Provided is a practically useful organic EL element having high efficiency and high driving stability while being capable of being driven at a low voltage. The organic EL element has a light-emitting layer and any other organic layer between an anode and a cathode opposite to each other. The light-emitting layer contains at least two host materials and at least one light-emitting dopant. At least one of the host materials is a host material selected from compounds each having one or two indolocarbazole skeletons, and at least one of the other host materials is a host material selected from carbazole compounds each substituted with a dibenzofuran or a dibenzothiophene.Type: GrantFiled: November 21, 2013Date of Patent: July 23, 2019Assignees: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., PIONEER CORPORATION, TOHOKU PIONEER CORPORATIONInventors: Masashi Tada, Takahiro Kai, Katsuhide Noguchi, Yasuhiro Takahashi, Yuhki Terao, Taishi Tsuji, Yusuke Nakajima, Toshinao Yuki
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Patent number: 10340460Abstract: Provided is a practically useful organic electroluminescent device (organic EL device) having high efficiency and high driving stability while being capable of being driven at a low voltage. The organic electroluminescent device includes a light-emitting layer between an anode and a cathode opposite to each other. The light-emitting layer contains two host materials and at least one light-emitting dopant. One of the two host materials is a host material selected from an indolocarbazole compound having one indolocarbazole ring and an indolocarbazole compound having two indolocarbazole rings, and the other thereof is a host material selected from carbazole compounds.Type: GrantFiled: March 25, 2013Date of Patent: July 2, 2019Assignees: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., PIONEER CORPORATION, TOHOKU PIONEER CORPORATIONInventors: Takayuki Fukumatsu, Katsuhide Noguchi, Masashi Tada, Mitsuru Sakai, Tohru Asari, Kazuto Shiraishi, Takahiro Kai, Yasuhiro Takahashi, Yuhki Terao, Taishi Tsuji, Yusuke Nakajima, Toshinao Yuki
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Patent number: 10305048Abstract: Disclosed are an organic electroluminescent device that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple construction, and a material for an organic electroluminescent device to be used in the device. The material is a material for an organic electroluminescent device formed of a carborane compound having an indolocarbazole skeleton and one or two or more carborane groups each bonded thereto directly or through a divalent group. In addition, the device is an organic electroluminescent device having organic layers including a light-emitting layer between an anode and a cathode laminated on a substrate, in which at least one layer of the organic layers contains the material for an organic electroluminescent device. In addition, the device is an organic electroluminescent device containing, as a host material for a light-emitting layer containing a phosphorescent light-emitting dopant and the host material, the material for an organic electroluminescent device.Type: GrantFiled: February 23, 2015Date of Patent: May 28, 2019Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Junya Ogawa, Takahiro Kai, Tokiko Ueda, Masashi Tada, Masaki Komori, Toshihiro Yamamoto
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Patent number: 10283721Abstract: Disclosed are an organic electroluminescent device (organic EL device) having improved luminous efficiency, sufficiently secured driving stability, and a simple construction, and a material for an organic EL device. The material for an organic EL device includes a carborane compound having a structure in which at least one carborane ring and at least one dibenzothiophene ring are present, and the at least one carborane ring is bonded to the at least one dibenzothiophene ring at position 1, 2, or 3. In addition, the organic EL device includes, between an anode and a cathode laminated on a substrate, at least one organic layer, in which the at least one organic layer includes the carborane compound.Type: GrantFiled: November 5, 2014Date of Patent: May 7, 2019Assignee: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.Inventors: Junya Ogawa, Masashi Tada, Tokiko Ueda, Takahiro Kai
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Publication number: 20180254426Abstract: Provided is an organic electroluminescent device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device is an organic electroluminescent device including a light-emitting layer between an anode and a cathode opposite to each other, in which: the light-emitting layer contains two kinds of host materials and a light-emitting dopant; and a first host material (H1) out of the two kinds of host materials is an indolocarbazole-based compound having one or two indolocarbazole rings, and a second host material (H2) out of the materials is a host material selected from carbazole-based compounds each represented by the general formula (3), the compounds each having a structure in which two carbazole rings are bonded through a six-membered aromatic ring.Type: ApplicationFiled: March 14, 2016Publication date: September 6, 2018Applicant: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Yuji IKENAGA, Takahiro KAI, Masanori HOTTA, Junya OGAWA, Mitsuru SAKAI, Masashi TADA, Tokiko UEDA, Katsuhide NOGUCHI
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Publication number: 20180233687Abstract: Provided are a material for an organic electroluminescent device showing excellent electron- and hole-injecting/transporting properties, and having proper lowest singlet excitation energy and proper lowest triplet excitation energy, and an organic EL device using the material.Type: ApplicationFiled: August 18, 2015Publication date: August 16, 2018Inventors: Takahiro Kai, Hideki Tanaka, Atsushi Kawada
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Patent number: 9985219Abstract: Provided is an organic electroluminescent device (EL device) using an indolocarbazole compound. The organic EL device is obtained by laminating an anode, a plurality of organic layers including a phosphorescent light-emitting layer, and a cathode on a substrate, and the phosphorescent light-emitting layer, a hole-transporting layer, an electron-transporting layer, a hole-blocking layer, or an electron-blocking layer contains an indolocarbazole compound represented by the general formula (1).Type: GrantFiled: February 28, 2013Date of Patent: May 29, 2018Assignee: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Rumi Sannomiya, Takahiro Kai, Masaki Komori, Toshihiro Yamamoto
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Patent number: 9978963Abstract: Provided are an organic electroluminescent device (organic EL device) that is improved in luminous efficacy, sufficiently secures driving stability, and has a simple construction, and a material for organic EL devices to be used in the organic EL device. The material for organic EL devices is a material for organic EL devices formed of an ortho-carborane compound having a structure in which a silyl group (—SiR3) is bonded to a divalent ortho-carborane group represented by C2B10H10 through an aromatic group. In addition, the organic electroluminescent device is an organic electroluminescent device having a structure in which an anode, an organic layer, and a cathode are laminated on a substrate, the device having an organic layer containing the ortho-carborane compound, and the organic layer being a light-emitting layer, an electron-transporting layer, a hole-blocking layer, or an exciton-blocking layer.Type: GrantFiled: August 28, 2014Date of Patent: May 22, 2018Assignee: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Tokiko Ueda, Junya Ogawa, Takahiro Kai