TW200519184A - Charge-transporting organic material containing compound with a 1, 4-dithiin ring - Google Patents

Charge-transporting organic material containing compound with a 1, 4-dithiin ring

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Publication number
TW200519184A
TW200519184A TW093132998A TW93132998A TW200519184A TW 200519184 A TW200519184 A TW 200519184A TW 093132998 A TW093132998 A TW 093132998A TW 93132998 A TW93132998 A TW 93132998A TW 200519184 A TW200519184 A TW 200519184A
Authority
TW
Taiwan
Prior art keywords
organic material
charge
material containing
containing compound
transporting organic
Prior art date
Application number
TW093132998A
Other languages
English (en)
Other versions
TWI355411B (zh
Inventor
Takuji Yoshimoto
Go Ono
Original Assignee
Nissan Chemical Ind Ltd
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Publication date
Application filed by Nissan Chemical Ind Ltd filed Critical Nissan Chemical Ind Ltd
Publication of TW200519184A publication Critical patent/TW200519184A/zh
Application granted granted Critical
Publication of TWI355411B publication Critical patent/TWI355411B/zh

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D339/00Heterocyclic compounds containing rings having two sulfur atoms as the only ring hetero atoms
    • C07D339/02Five-membered rings
    • C07D339/06Five-membered rings having the hetero atoms in positions 1 and 3, e.g. cyclic dithiocarbonates
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D409/00Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
    • C07D409/14Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing three or more hetero rings
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/12Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/654Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/655Aromatic compounds comprising a hetero atom comprising only sulfur as heteroatom
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/14Carrier transporting layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/14Carrier transporting layers
    • H10K50/15Hole transporting layers
    • H10K50/155Hole transporting layers comprising dopants
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/14Carrier transporting layers
    • H10K50/16Electron transporting layers
    • H10K50/165Electron transporting layers comprising dopants
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/17Carrier injection layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/17Carrier injection layers
    • H10K50/171Electron injection layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/10Organic polymers or oligomers
    • H10K85/111Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
    • H10K85/113Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30Coordination compounds
    • H10K85/311Phthalocyanine
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30Coordination compounds
    • H10K85/341Transition metal complexes, e.g. Ru(II)polypyridine complexes
    • H10K85/346Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising platinum
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/615Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/631Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
    • H10K85/633Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/631Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
    • H10K85/636Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/656Aromatic compounds comprising a hetero atom comprising two or more different heteroatoms per ring
    • H10K85/6565Oxadiazole compounds
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/657Polycyclic condensed heteroaromatic hydrocarbons
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/549Organic PV cells
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
TW093132998A 2003-10-31 2004-10-29 Charge-transporting organic material containing compound with a 1, 4-dithiin ring TW200519184A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003371782 2003-10-31

Publications (2)

Publication Number Publication Date
TW200519184A true TW200519184A (en) 2005-06-16
TWI355411B TWI355411B (zh) 2012-01-01

Family

ID=34543973

Family Applications (1)

Application Number Title Priority Date Filing Date
TW093132998A TW200519184A (en) 2003-10-31 2004-10-29 Charge-transporting organic material containing compound with a 1, 4-dithiin ring

Country Status (7)

Country Link
US (1) US7795452B2 (zh)
EP (1) EP1691586B1 (zh)
JP (1) JP4811573B2 (zh)
KR (1) KR101150743B1 (zh)
CN (2) CN101817810A (zh)
TW (1) TW200519184A (zh)
WO (1) WO2005043962A1 (zh)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101064529B1 (ko) * 2002-11-07 2011-09-14 닛산 가가쿠 고교 가부시키 가이샤 전하수송성 니스
US9251923B2 (en) * 2004-04-30 2016-02-02 Nissan Chemical Industries, Ltd. Varnish containing good solvent and poor solvent
EP1950816A4 (en) * 2005-10-28 2012-02-22 Nissan Chemical Ind Ltd CHARGE TRANSPORT VARNISH FOR A SPRAYING OR INKJET PROCESS
CN101489991B (zh) 2006-07-18 2013-11-06 日产化学工业株式会社 电荷传输性清漆
CN100479228C (zh) * 2006-08-08 2009-04-15 中国科学院化学研究所 基于电子受体材料的蓝光有机发光二极管的制备方法
KR101473294B1 (ko) 2006-09-13 2014-12-16 닛산 가가쿠 고교 가부시키 가이샤 올리고아닐린 화합물 및 그 이용
KR101557109B1 (ko) 2007-04-12 2015-10-02 닛산 가가쿠 고교 가부시키 가이샤 올리고아닐린 화합물
KR20090082778A (ko) 2008-01-28 2009-07-31 삼성모바일디스플레이주식회사 유기전계발광소자 및 그 제조방법
JP5672681B2 (ja) * 2008-09-18 2015-02-18 三菱化学株式会社 電荷輸送膜用組成物、有機電界発光素子、有機elディスプレイ及び有機el照明
KR101609595B1 (ko) 2008-10-09 2016-04-06 닛산 가가쿠 고교 가부시키 가이샤 전하수송성 바니시
KR20160088440A (ko) 2008-11-19 2016-07-25 닛산 가가쿠 고교 가부시키 가이샤 전하수송성 재료 및 전하수송성 바니시
JP5375434B2 (ja) * 2009-08-21 2013-12-25 富士ゼロックス株式会社 有機電界発光素子及び表示媒体
WO2011091607A1 (zh) 2010-01-30 2011-08-04 海洋王照明科技股份有限公司 含芴卟啉-蒽共聚物、其制备方法和应用
CN102712652B (zh) * 2010-03-23 2014-03-19 海洋王照明科技股份有限公司 含芴卟啉-苯共聚物、其制备方法和应用
JP5685826B2 (ja) * 2010-03-26 2015-03-18 三菱化学株式会社 電荷輸送膜用組成物、有機電界発光素子、有機elディスプレイ及び有機el照明
CN102295757B (zh) * 2010-06-25 2013-04-17 海洋王照明科技股份有限公司 含咔唑卟啉-噻吩并吡嗪共聚物及其制备方法和应用
CN102329415B (zh) * 2010-07-13 2013-04-17 海洋王照明科技股份有限公司 含咔唑卟啉-喹喔啉共聚物及其制备方法和应用
US9431621B2 (en) 2012-03-13 2016-08-30 The Regents Of The University Of Michigan Metal oxide charge transport material doped with organic molecules
JP6098042B2 (ja) * 2012-04-24 2017-03-22 日立化成株式会社 色変化防止剤、該色変化防止剤を含むインク組成物、該インク組成物を用いて形成した有機薄膜、有機エレクトロニクス素子、有機エレクトロルミネセンス素子、表示素子、照明装置、及び表示装置
KR101922494B1 (ko) 2013-10-04 2018-11-27 닛산 가가쿠 가부시키가이샤 아닐린 유도체 및 그 이용
TWI614249B (zh) * 2013-10-04 2018-02-11 Nissan Chemical Ind Ltd 電荷輸送性清漆、電荷輸送性薄膜及有機電致發光元件
CN105612146B (zh) 2013-10-09 2017-10-27 日产化学工业株式会社 芳基磺酸化合物及其利用以及芳基磺酸化合物的制备方法
KR102543967B1 (ko) * 2015-03-13 2023-06-15 닛산 가가쿠 가부시키가이샤 유기 일렉트로루미네센스 소자용의 전하 수송성 박막 형성 조성물, 유기 일렉트로루미네센스 소자용의 전하 수송성 박막 및 유기 일렉트로루미네센스 소자
WO2016148184A1 (ja) 2015-03-17 2016-09-22 日産化学工業株式会社 光センサ素子の正孔捕集層形成用組成物および光センサ素子
KR102153447B1 (ko) * 2015-12-01 2020-09-08 엘티소재주식회사 헤테로고리 화합물 및 이를 이용한 유기 발광 소자
WO2017135117A1 (ja) 2016-02-03 2017-08-10 日産化学工業株式会社 電荷輸送性ワニス
JP6717372B2 (ja) 2016-03-03 2020-07-01 日産化学株式会社 電荷輸送性ワニス
US20190084920A1 (en) 2016-03-24 2019-03-21 Nissan Chemical Corporation Arylamine derivative and use thereof
JP6443587B2 (ja) 2016-06-16 2018-12-26 日産化学株式会社 スルホン酸エステル化合物及びその利用
CN109415310B (zh) 2016-06-16 2022-03-01 日产化学株式会社 磺酸酯化合物及其利用
KR102528211B1 (ko) 2017-02-07 2023-05-03 닛산 가가쿠 가부시키가이샤 전하 수송성 바니시
EP3608983A4 (en) 2017-04-05 2021-01-13 Nissan Chemical Corporation CARGO TRANSPORT PAINT
WO2018216507A1 (ja) 2017-05-25 2018-11-29 日産化学株式会社 電荷輸送性薄膜の製造方法
TWI801471B (zh) 2017-12-20 2023-05-11 日商日產化學股份有限公司 磺酸酯化合物及其利用
JP6958637B2 (ja) 2017-12-20 2021-11-02 日産化学株式会社 電荷輸送性ワニス及び電荷輸送性薄膜
CN112771995B (zh) 2018-09-25 2024-08-16 日产化学株式会社 带有有机功能膜的基板的制造方法
CN111430553B (zh) * 2020-04-07 2022-06-21 杭州纤纳光电科技有限公司 一种稳定的钙钛矿太阳能电池及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5649304A (en) * 1979-09-29 1981-05-02 Hodogaya Chem Co Ltd Expellent against soil injurious organism
CA1150284A (en) * 1980-12-02 1983-07-19 Allan K.S. Tsai Method of making certain 2,3-dihydro-1,4-dithiins
JPS61152677A (ja) * 1984-12-26 1986-07-11 Seitetsu Kagaku Co Ltd 2−ハロアセチルチオフエン類の製造法
JP2876718B2 (ja) * 1990-06-11 1999-03-31 株式会社デンソー 自動車用空調装置
JP4868099B2 (ja) * 2000-11-09 2012-02-01 日産化学工業株式会社 電界発光素子
KR101064529B1 (ko) * 2002-11-07 2011-09-14 닛산 가가쿠 고교 가부시키 가이샤 전하수송성 니스

Also Published As

Publication number Publication date
CN101817810A (zh) 2010-09-01
JP4811573B2 (ja) 2011-11-09
EP1691586B1 (en) 2015-10-14
EP1691586A4 (en) 2009-07-01
US20070043222A1 (en) 2007-02-22
EP1691586A1 (en) 2006-08-16
WO2005043962A1 (ja) 2005-05-12
CN1887033B (zh) 2010-12-15
US7795452B2 (en) 2010-09-14
JPWO2005043962A1 (ja) 2007-05-17
CN1887033A (zh) 2006-12-27
KR20060096057A (ko) 2006-09-05
KR101150743B1 (ko) 2012-06-08
TWI355411B (zh) 2012-01-01

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