US20120056172A1 - Organic light-emitting device - Google Patents

Organic light-emitting device Download PDF

Info

Publication number
US20120056172A1
US20120056172A1 US13/298,623 US201113298623A US2012056172A1 US 20120056172 A1 US20120056172 A1 US 20120056172A1 US 201113298623 A US201113298623 A US 201113298623A US 2012056172 A1 US2012056172 A1 US 2012056172A1
Authority
US
United States
Prior art keywords
group
compound
substituted
integer
same
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/298,623
Inventor
Satoshi Igawa
Masashi Hashimoto
Shinjiro Okada
Takao Takiguchi
Keiji Okinaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to US13/298,623 priority Critical patent/US20120056172A1/en
Publication of US20120056172A1 publication Critical patent/US20120056172A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C13/00—Cyclic hydrocarbons containing rings other than, or in addition to, six-membered aromatic rings
    • C07C13/28—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof
    • C07C13/32—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings
    • C07C13/62—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with more than three condensed rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C13/00—Cyclic hydrocarbons containing rings other than, or in addition to, six-membered aromatic rings
    • C07C13/28—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof
    • C07C13/32—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings
    • C07C13/54—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with three condensed rings
    • C07C13/547—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with three condensed rings at least one ring not being six-membered, the other rings being at the most six-membered
    • C07C13/567—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with three condensed rings at least one ring not being six-membered, the other rings being at the most six-membered with a fluorene or hydrogenated fluorene ring system
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C13/00—Cyclic hydrocarbons containing rings other than, or in addition to, six-membered aromatic rings
    • C07C13/28—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof
    • C07C13/32—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings
    • C07C13/62—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with more than three condensed rings
    • C07C13/66—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with more than three condensed rings the condensed ring system contains only four rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
    • C07C15/40—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts substituted by unsaturated carbon radicals
    • C07C15/56—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts substituted by unsaturated carbon radicals polycyclic condensed
    • C07C15/62—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts substituted by unsaturated carbon radicals polycyclic condensed containing four rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C25/00—Compounds containing at least one halogen atom bound to a six-membered aromatic ring
    • C07C25/18—Polycyclic aromatic halogenated hydrocarbons
    • C07C25/22—Polycyclic aromatic halogenated hydrocarbons with condensed rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D259/00—Heterocyclic compounds containing rings having more than four nitrogen atoms as the only ring hetero atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H10K85/624—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing six or more rings
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2601/00—Systems containing only non-condensed rings
    • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
    • C07C2601/14—The ring being saturated
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2603/00—Systems containing at least three condensed rings
    • C07C2603/02—Ortho- or ortho- and peri-condensed systems
    • C07C2603/04—Ortho- or ortho- and peri-condensed systems containing three rings
    • C07C2603/06—Ortho- or ortho- and peri-condensed systems containing three rings containing at least one ring with less than six ring members
    • C07C2603/10—Ortho- or ortho- and peri-condensed systems containing three rings containing at least one ring with less than six ring members containing five-membered rings
    • C07C2603/12—Ortho- or ortho- and peri-condensed systems containing three rings containing at least one ring with less than six ring members containing five-membered rings only one five-membered ring
    • C07C2603/18—Fluorenes; Hydrogenated fluorenes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2603/00—Systems containing at least three condensed rings
    • C07C2603/02—Ortho- or ortho- and peri-condensed systems
    • C07C2603/04—Ortho- or ortho- and peri-condensed systems containing three rings
    • C07C2603/22—Ortho- or ortho- and peri-condensed systems containing three rings containing only six-membered rings
    • C07C2603/24—Anthracenes; Hydrogenated anthracenes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2603/00—Systems containing at least three condensed rings
    • C07C2603/02—Ortho- or ortho- and peri-condensed systems
    • C07C2603/40—Ortho- or ortho- and peri-condensed systems containing four condensed rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2603/00—Systems containing at least three condensed rings
    • C07C2603/02—Ortho- or ortho- and peri-condensed systems
    • C07C2603/40—Ortho- or ortho- and peri-condensed systems containing four condensed rings
    • C07C2603/42—Ortho- or ortho- and peri-condensed systems containing four condensed rings containing only six-membered rings
    • C07C2603/50—Pyrenes; Hydrogenated pyrenes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2603/00—Systems containing at least three condensed rings
    • C07C2603/56—Ring systems containing bridged rings
    • C07C2603/90—Ring systems containing bridged rings containing more than four rings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1003—Carbocyclic compounds
    • C09K2211/1007—Non-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1003—Carbocyclic compounds
    • C09K2211/1011—Condensed systems
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1003—Carbocyclic compounds
    • C09K2211/1014—Carbocyclic compounds bridged by heteroatoms, e.g. N, P, Si or B
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
    • H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H10K85/623—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing five rings, e.g. pentacene
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
    • H10K85/633—Amine 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/917—Electroluminescent

Definitions

  • the present invention relates to a light-emitting device using an organic compound, and more particularly relates to an organic light-emitting device that emits light by applying an electric field to a thin film including the organic compound.
  • An organic light-emitting device is a device having a thin film which contains a fluorescent or phosphorescent organic compound and is interposed between an anode and a cathode. Electrons and holes (positive holes) are injected from the respective electrodes, whereby excitons of the fluorescent or phosphorescent compound are produced. The excitons radiate light upon return thereof to a ground state. Recent progress of an organic light-emitting device is remarkable, and the characteristics of the device enable a thin and light weight light-emitting device with a high luminance at a low applied voltage, a variety of emission wavelengths, and a high-speed responsibility. From this fact, it is suggested that the device have potential to find use in a wide variety of applications.
  • the organic light-emitting device still involves a large number of problems in terms of durability such as a change over time due to long-term use and degradation due to an atmospheric gas containing oxygen, moisture or the like. Further, when the application of the device to a full-color display or the like is taken into consideration, the emission of blue, green, or red light with good color purity is needed. However, these problems have not been sufficiently solved yet.
  • an organic light-emitting device which includes a pair of electrodes including an anode and a cathode; and a layer including an organic compound disposed between the pair of electrodes, in which the layer includes a first compound represented by the general formula (I):
  • R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom; and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than an energy gap of the first compound.
  • the second compound has a pyrene skeleton and a fluorene skeleton.
  • the second compound is represented by the general formula (II):
  • R 21 , R 22 , R 23 , and R 24 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a and b each independently represent an integer of 1 to 4, and when there are a plurality of any of R 23 and R 24 , they may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • the second compound is represented by the general formula (III):
  • R 21 , R 22 , R 23 , and R 25 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R 23 is present in plurality, R 23 's may be the same or different from each other; c represents an integer of 1 to 9, and when R 25 is present in plurality, R 25 's may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • the second compound is represented by the general formula (IV):
  • R 21 , R 22 , R 23 , R 26 , and R 27 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R 23 is present in plurality, R 23 's may be the same or different from each other; d represents an integer of 1 to 4, and when R 26 is present in plurality, R 26 's may be the same or different from each other; e represents an integer of 1 to 9, and when R 27 is present in plurality, R 27 's may be the same or different from each other; m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other; and n represents an integer of 1 to 5, and when n is 2 or more, the plurality of phenylene groups may be the same or different from each other.
  • the second compound is represented by the general formula (V):
  • R 28 and R 29 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; f represents an integer of 1 to 7, and when R 29 is present in plurality, R 28 's may be the same or different from each other; g represents an integer of 1 to 9, and when R 29 is present in plurality, R 29 's may be the same or different from each other; and p represents an integer of 1 to 5, and when p is 2 or more, the plurality of naphthalenediyl groups may be the same or different from each other.
  • first compound and the second compound consist of only carbon and hydrogen.
  • FIG. 1 is a cross-sectional view illustrating a first embodiment of the organic light-emitting device of the present invention.
  • FIG. 2 is a cross-sectional view illustrating a second embodiment of the organic light-emitting device of the present invention.
  • FIG. 3 is a cross-sectional view illustrating a third embodiment of the organic light-emitting device of the present invention.
  • FIG. 4 is a cross-sectional view illustrating a fourth embodiment of the organic light-emitting device of the present invention.
  • FIG. 5 is a cross-sectional view illustrating a fifth embodiment of the organic light-emitting device of the present invention.
  • FIG. 6 is a cross-sectional view illustrating a sixth embodiment of the organic light-emitting device of the present invention.
  • the organic light-emitting device of the present invention will be described in detail.
  • the organic light-emitting device of the present invention is formed of an anode, a cathode, and a layer formed of an organic compound and interposed between the anode and the cathode.
  • the layer formed of the organic compound contains the fused ring aromatic compound of the present invention.
  • the organic light-emitting device of the present invention is preferably an electroluminescent device that emits light by applying a voltage between an anode and a cathode.
  • Reference numeral 1 denotes a substrate
  • reference numeral 2 denotes an anode
  • reference numeral 3 denotes a light-emitting layer
  • reference numeral 4 denotes a cathode
  • reference numeral 5 denotes a hole-transporting layer
  • reference numeral 6 denotes an electron-transporting layer
  • reference numeral 7 denotes a hole injection layer
  • reference numeral 8 denotes a hole/exciton blocking layer
  • reference numerals 10 , 20 , 30 , 40 , 50 , and 60 each denote an organic light-emitting device.
  • FIG. 1 is a schematic cross-sectional view illustrating a first embodiment of the organic light-emitting device of the present invention.
  • the organic light-emitting device 10 shown in FIG. 1 there are sequentially provided on a substrate 1 , an anode 2 , a light-emitting layer 3 and a cathode 4 .
  • the configuration of the organic light-emitting device 10 is useful when the light-emitting layer 3 is composed of a compound having all of hole transporting ability, electron transporting ability and light emitting ability, or when the light-emitting layer 3 is composed of a mixture of compounds having the characteristics of any one of hole transporting ability, electron transporting ability, and light emitting ability.
  • FIG. 2 is a schematic cross-sectional view illustrating a second embodiment of the organic light-emitting device of the present invention.
  • the organic light-emitting device 20 shown in FIG. 2 there are sequentially provided on a substrate 1 , an anode 2 , a hole-transporting layer 5 , an electron-transporting layer 6 , and a cathode 4 .
  • the configuration of the organic light-emitting device 20 is useful when an organic compound having either one of hole transporting ability and electron transporting ability and an organic compound having only electron transporting ability or hole transporting ability are used in combination.
  • the hole-transporting layer 5 and the electron-transporting layer 6 each serve also as a light-emitting layer.
  • FIG. 3 is a schematic cross-sectional view illustrating a third embodiment of the organic light-emitting device of the present invention.
  • the organic light-emitting device 30 shown in FIG. 3 is different from the organic light-emitting device 20 shown in FIG. 2 in that a light-emitting layer 3 is additionally provided between a hole-transporting layer 5 and an electron-transporting layer 6 .
  • the organic light-emitting device 30 has a configuration in which the functions of carrier transportation and light emission are separated from each other, so that organic compounds having characteristics of hole-transporting property, electron-transporting property and light-emitting property, respectively, can suitably be combined and used.
  • FIG. 4 is a schematic cross-sectional view illustrating a fourth embodiment of the organic light-emitting device of the present invention.
  • the organic light-emitting device 40 shown in FIG. 4 is different from the organic light-emitting device 30 shown in FIG. 3 in that a hole injection layer 7 is additionally provided between an anode 2 and a hole-transporting layer 5 .
  • a hole injection layer 7 is additionally provided between an anode 2 and a hole-transporting layer 5 .
  • the adhesion between the anode 2 and the hole-transporting layer 5 or the hole injection property is improved, so that the driving voltage can be effectively reduced.
  • FIG. 5 is a schematic cross-sectional view illustrating a fifth embodiment of the organic light-emitting device of the present invention.
  • the organic light-emitting device 50 shown in FIG. 5 is different from the organic light-emitting device 30 shown in FIG. 3 in that a layer (hole/exciton blocking layer 8 ) for blocking holes or excitons from passing to a cathode 4 side is additionally provided between a light-emitting layer 3 and an electron-transporting layer 6 .
  • the configuration improves the emission efficiency of the organic light-emitting device 50 by using an organic compound with a significantly high ionization potential as the hole/exciton blocking layer 8 .
  • FIG. 6 is a cross-sectional view illustrating a sixth embodiment of the organic light-emitting device of the present invention.
  • the organic light-emitting device 60 shown in FIG. 6 is different from the organic light-emitting device 40 shown in FIG. 4 in that the hole/exciton-blocking layer 8 is additionally provided between the light-emitting layer 3 and the electron-transporting layer 6 .
  • the hole/exciton-blocking layer 8 is additionally provided between the light-emitting layer 3 and the electron-transporting layer 6 .
  • FIGS. 1 to 6 merely show very basic device configurations and the configuration of the organic light-emitting device containing the naphthalene compound according to the present invention is not limited thereto.
  • a hole-transporting layer 5 is composed of two layers having different ionization potentials.
  • the process for light emission is composed of the following several steps.
  • the desired energy transfer and light emission in the respective steps are caused in competition with various deactivation steps.
  • the term “guest” as herein employed refers to a compound that emits light in response to recombination between holes and electrons in an emission region of the organic light-emitting device, and the guest is contained, together with a substance (host) forming the emission region, in the light-emitting layer 3 .
  • the emission region may be either a region of one layer or an interface between a plurality of layers, and is preferably one layer.
  • a layer having an emission region may be called “light-emitting layer (or emission layer)”.
  • the emission quantum yield of a luminescent center material itself needs to be increased.
  • how high efficiency of energy transfer between hosts or between a host and a guest can be achieved is also a large problem.
  • the cause for degradation of light emission due to energization has not been clarified yet.
  • the degradation is related at least to a luminescent center material itself or an environmental change of a light-emitting material due to surrounding molecules.
  • a first compound represented by the following general formula (I) is used as a guest and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than the energy gap of the first compound is used as a host in a light-emitting layer 3 .
  • R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 R 13 , R 14 , R 15 , and R 16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom.
  • the compound represented by the general formula (I) has a high quantum yield.
  • this compound is used as a guest and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than the energy gap of the first compound is used as a host, a device having a high emission efficiency and a long life can be provided.
  • Organic materials suitable for each of the guest material and the host material will be described below in detail.
  • a guest material is a compound represented by the following general formula (I):
  • R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 3 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, a cyclohexyl group, or a trifluoromethyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group,
  • the content of the compound used as a guest is preferably 50% by weight or less based on the total weight of materials constituting a light-emitting layer.
  • the content is more preferably 0.1% by weight or more and 30% by weight or less, particularly preferably 0.1% by weight or more and 15% by weight or less from the viewpoint of energy transfer from a host to a light-emitting guest.
  • a compound having a lone electron pair can act as a ligand or a Lewis base. Therefore, the compound tends to hold impurities therein.
  • association and chemical reaction with surrounding molecules may be caused in an organic light-emitting device. Accordingly, a compound consisting of only carbon and hydrogen is particularly preferable as a guest material.
  • the host is also preferably a fused ring aromatic compound from the viewpoint of compatibility between the host and the guest.
  • a pyrene skeleton material and a fluorene skeleton material are particularly excellent in carrier-transporting property.
  • the mobility of either of electrons or holes is higher than that of the other, while in a pyrene skeleton material and a fluorene skeleton material, the mobilities of both of electrons and holes are relatively high, and the difference between the mobilities of electrons and holes is also small.
  • a HOMO gap between a guest and a host and a LUMO gap between the guest and the host have a preferable relationship with each other. Accordingly, a device having a high emission efficiency and a long life in which the electron/hole carrier balance in the light-emitting layer is maintained can be provided. Furthermore, a compound having both of a fluorene ring and a pyrene ring in a host molecule is particularly preferable from the viewpoint of carrier-transporting property.
  • R 21 , R 22 , R 23 , and R 24 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a peryleny
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group.
  • alkyl groups such as
  • a and b each independently represent an integer of 1 to 4, and when there are a plurality of any of R 23 and R 24 , they may be the same or different from each other.
  • m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • R 21 , R 22 , R 23 , and R 25 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a peryleny
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group.
  • alkyl groups such as
  • a represents an integer of 1 to 4, and when R 23 is present in plurality, R 23 's may be the same or different from each other.
  • c represents an integer of 1 to 9, and when R 25 is present in plurality, R 25 's may be the same or different from each other.
  • m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • R 21 , R 22 , R 23 , R 26 , and R 27 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group.
  • alkyl groups such as
  • a represents an integer of 1 to 4, and when R 23 is present in plurality, R 23 's may be the same or different from each other.
  • d represents an integer of 1 to 4, and when R 26 is present in plurality, R 26 's may be the same or different from each other.
  • e represents an integer of 1 to 9, and when R 27 is present in plurality, R 27 's may be the same or different from each other.
  • m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • n represents an integer of 1 to 5, and when n is 2 or more, the plurality of phenylene groups may be the same or different from each other.
  • R 28 and R 29 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a perylenyl group.
  • an alkyl group such
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group.
  • alkyl groups such as
  • f represents an integer of 1 to 7, and when R 28 is present in plurality, R 28 's may be the same or different from each other.
  • g represents an integer of 1 to 9, and when R 29 is present in plurality, R 29 's may be the same or different from each other.
  • p represents an integer of 1 to 5, and when p is 2 or more, the plurality of naphthalenediyl groups may be the same or different from each other.
  • host compound having a pyrene skeleton usable for the present invention include structures as shown below, but the present invention should not be limited to these structures.
  • the host materials represented by the general formulae (II) to (V) of the present invention can provide the following excellent characteristics from the molecular structures.
  • the amorphous property is extremely excellent and the heat resistance is high.
  • a preferable carrier injection level can easily be obtained.
  • the fluorene skeleton host or pyrene skeleton host is highly compatible with the guest represented by the general formula (I) and the light-emitting dopant is well dispersed in a film. Therefore, reduction of the efficiency and reduction of the life due to association of the light-emitting dopant can be suppressed. It is preferable from the viewpoint of compatibility that the host material and the light-emitting dopant are hydrocarbon compounds.
  • the fused ring aromatic compound of the present invention is preferably used as a component constituting either an electron-transporting layer or a light-emitting layer, but a hitherto known hole-transporting compound, light-emitting compound or an electron-transporting compound can also be used together, as needed
  • An anode material used for the organic light-emitting device of the present invention preferably has as large a work function as possible, and includes, for instance, an elemental metal such as gold, platinum, nickel, palladium, cobalt, selenium, and vanadium, an alloy thereof, and a metal oxide such as tin oxide, zinc oxide, indium tin oxide (ITO) and indium zinc oxide. Further, a conductive polymer such as polyaniline, polypyrrole, polythiophene and polyphenylene sulfide can be employed. These electrode materials can be used singly or in combination.
  • a cathode material used for the organic light-emitting device of the present invention preferably has a low work function, and include, for instance, an elemental metal such as lithium, sodium, potassium, cesium, calcium, magnesium, aluminum, indium, silver, lead, tin, and chromium.
  • an alloy made of a plurality of the above metals can also be used.
  • a metal oxide such as indium tin oxide (ITO) can be also utilized.
  • the cathode may be either of a single layer configuration or of a multilayer configuration.
  • a substrate used for the organic light-emitting device of the present invention is not particularly limited, but an opaque substrate such as a metal substrate and a ceramic substrate or a transparent substrate such as glass, quartz, and a plastic sheet is used. Further, it is also possible to employ, for a substrate, a color filter film, a fluorescent color conversion filter film and a dielectric reflection film to thereby control the emission color.
  • a protective layer or an encapsulation layer may further be provided, for the purpose of preventing contact with oxygen or moisture.
  • a protective layer include a diamond thin film; a film of an inorganic material such as a metal oxide and a metal nitride; a film of a polymer such as a fluororesin, poly-p-xylene, polyethylene, silicone resin, and polystyrene resin; and further a photocurable resin.
  • the produced device may also be covered with glass, a gas-impermeable film and a metal, or be packaged with a suitable encapsulation resin.
  • a layer containing the fused ring aromatic compound of the present invention and other layers containing an inorganic compound are formed by the below-mentioned methods.
  • a thin film is formed by a vacuum evaporation method or a coating method of applying an organic compound dissolved in a suitable solvent.
  • the film can be formed by additionally using a suitable binder resin.
  • the above described binder resin can be selected from a wide range of binding resins, and includes, for instance, polyvinylcarbazole resin, polycarbonate resin, polyester resin, polyarylate resin, polystyrene resin, acrylic resin, methacrylic resin, butyral resin, polyvinylacetal resin, diallylphthalate resin, phenolic resin, epoxy resin, silicone resin, polysulfonic resin and urea resin, but is not limited to them.
  • a layer including the fused ring aromatic compound of the present invention is made to have a film thickness of 10 ⁇ m or less, preferably 0.5 ⁇ m or less, and more preferably 0.01 ⁇ m or more and 0.5 ⁇ m or less.
  • ITO indium tin oxide
  • IPA acetone and isopropyl alcohol
  • a film was formed in a thickness of 20 nm on the transparent conductive support substrate by spin coating of a solution of Compound 1 represented by the following formula in chloroform.
  • organic layers and an electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10 ⁇ 5 Pa to produce an organic light-emitting device.
  • a film was formed in a thickness of 30 nm by coevaporation of Exemplified Compound No. A-2 as a guest and HB-51 as a host represented by the following formulae in such a manner that the content of Exemplified Compound No. A-2 was 5 wt % of the entirety of the light-emitting layer.
  • a film of Compound 2 represented by the formula above was formed in a thickness of 40 nm.
  • a film of LiF was formed in a thickness of 0.5 nm.
  • a film of Al was formed in a thickness of 150 nm.
  • the characteristics of the thus produced organic light-emitting device were examined. Specifically, the current-voltage characteristics of the device were measured with a pico-amp meter (Hewlett Packard 4140B), and the emission luminance of the device was measured with a BM7 manufactured by TOPCON CORPORATION. As a result, the device of this example was observed to emit green light with an emission luminance of 2,000 cd/m 2 at an applied voltage of 6.0 V.
  • the luminance was reduced from about 3,100 cd/m 2 at an initial stage to about 3,000 cd/m 2 after the elapse of the 100 hours, which meant that the luminance degradation was small.
  • a device was produced by following the same procedure as in Example 1 with the exception that Exemplified Compound No. A-11 shown below was used instead of Exemplified Compound No. A-2 as a guest for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 1 with the exception that Exemplified Compound No. B-20 shown below was used instead of Exemplified Compound No. A-2 as a guest for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 1 with the exception that Exemplified Compound No. B-1 shown below was used instead of Exemplified Compound No. A-2 as a guest for the light-emitting layer.
  • An electrode as an anode and a hole-transporting layer were formed on a substrate by following the same procedure as in Example 1.
  • organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10 ⁇ 5 Pa to produce an organic light-emitting device.
  • An electrode as an anode and a hole-transporting layer were formed on a substrate by following the same procedure as in Example 1.
  • organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10 ⁇ 5 Pa to produce an organic light-emitting device.
  • a device was produced by following the same procedure as in Example 5 with the exception that Exemplified Compound No. E-48 shown below was used instead of Exemplified Compound No. E-4 as a guest for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 5 with the exception that Exemplified Compound No. C-11 shown below was used instead of Exemplified Compound No. E-4 as a guest for the light-emitting layer.
  • An electrode as an anode and a hole-transporting layer were formed on a substrate by following the same procedure as in Example 1.
  • organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10 ⁇ 5 Pa to produce an organic light-emitting device.
  • a device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HB-55 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HB-25 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HC-1 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HA-47 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HD-4 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • a device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HD-8 shown below was used instead of Exemplified Compound No. HA-3 as a guest for the light-emitting layer.
  • a thin film transistor was formed on a glass substrate as a transparent substrate.
  • a film of polyimide was formed, followed by exposure, development and baking to thereby form a planarizing film.
  • contact holes were formed in advance, and electrodes formed in the subsequent steps were connected to the TFT through the contact holes.
  • an Al film was formed in a thickness of 100 nm on the planarizing film, and then an insulating film of a polyimide resin for pixel separation was stacked thereon and patterned.
  • organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10 ⁇ 5 Pa to produce an organic light-emitting device.
  • a device was produced by following the same procedure as in Example 9 with the exception that Comparative Compound 1 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • the device of this comparative example was observed to emit orange light resulting from Comparative Compound 1 as the host, and emission of green light intended by the present invention was not obtained. This is because the energy gap of the compound having the structure represented by the general formula (I) used in the present invention is larger than an energy gap of a compound having a tetracene skeleton.
  • a device was produced by following the same procedure as in Example 9 with the exception that Comparative Compound 2 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • the device of this comparative example was observed to emit green light with an emission luminance of 360 cd/m 2 at an applied voltage of 6.0 V.
  • a device was produced by following the same procedure as in Example 9 with the exception that Comparative Compound 3 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.

Abstract

There is provided a green-light-emitting device which has a high emission efficiency and a long continuous operational life, and which includes a pair of electrodes including an anode and a cathode; and a layer including an organic compound disposed between the pair of electrodes, wherein the layer includes a first compound represented by the general formula (I):
Figure US20120056172A1-20120308-C00001
wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom; and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than an energy gap of the first compound.

Description

    TECHNICAL FIELD
  • The present invention relates to a light-emitting device using an organic compound, and more particularly relates to an organic light-emitting device that emits light by applying an electric field to a thin film including the organic compound.
  • 2. Background Art
  • An organic light-emitting device is a device having a thin film which contains a fluorescent or phosphorescent organic compound and is interposed between an anode and a cathode. Electrons and holes (positive holes) are injected from the respective electrodes, whereby excitons of the fluorescent or phosphorescent compound are produced. The excitons radiate light upon return thereof to a ground state. Recent progress of an organic light-emitting device is remarkable, and the characteristics of the device enable a thin and light weight light-emitting device with a high luminance at a low applied voltage, a variety of emission wavelengths, and a high-speed responsibility. From this fact, it is suggested that the device have potential to find use in a wide variety of applications.
  • However, in the present circumstances, an optical output with a higher luminance or a higher conversion efficiency is needed. In addition, the organic light-emitting device still involves a large number of problems in terms of durability such as a change over time due to long-term use and degradation due to an atmospheric gas containing oxygen, moisture or the like. Further, when the application of the device to a full-color display or the like is taken into consideration, the emission of blue, green, or red light with good color purity is needed. However, these problems have not been sufficiently solved yet.
  • In order to solve the problems, there has been proposed incorporation, as a material for an organic light-emitting device, of a relatively large fused ring aromatic compound containing a pentacyclic structure. Specific examples of the relatively large fused ring aromatic compound containing a pentacyclic structure and an organic light-emitting device using the compound are disclosed in Japanese Patent Application Laid-Open Nos. H10-330295, 2002-170681, 2002-110356, H11-176573, and 2002-008867.
    • DISCLOSURE OF THE INVENTION
  • It is an object of the present invention to provide a green-light-emitting device which has a high emission efficiency and a long continuous operational life.
  • The above object is achieved by the present invention described below.
  • That is, according to the present invention, there is provided an organic light-emitting device, which includes a pair of electrodes including an anode and a cathode; and a layer including an organic compound disposed between the pair of electrodes, in which the layer includes a first compound represented by the general formula (I):
  • Figure US20120056172A1-20120308-C00002
  • wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom; and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than an energy gap of the first compound.
  • In the present invention, it is preferred that the second compound has a pyrene skeleton and a fluorene skeleton.
  • Further, it is preferred that the second compound is represented by the general formula (II):
  • Figure US20120056172A1-20120308-C00003
  • wherein R21, R22, R23, and R24 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a and b each independently represent an integer of 1 to 4, and when there are a plurality of any of R23 and R24, they may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • Moreover, it is preferred that the second compound is represented by the general formula (III):
  • Figure US20120056172A1-20120308-C00004
  • wherein R21, R22, R23, and R25 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other; c represents an integer of 1 to 9, and when R25 is present in plurality, R25's may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • Further, it is preferred that the second compound is represented by the general formula (IV):
  • Figure US20120056172A1-20120308-C00005
  • wherein R21, R22, R23, R26, and R27 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other; d represents an integer of 1 to 4, and when R26 is present in plurality, R26's may be the same or different from each other; e represents an integer of 1 to 9, and when R27 is present in plurality, R27's may be the same or different from each other; m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other; and n represents an integer of 1 to 5, and when n is 2 or more, the plurality of phenylene groups may be the same or different from each other.
  • Moreover, it is preferred that the second compound is represented by the general formula (V):
  • Figure US20120056172A1-20120308-C00006
  • wherein R28 and R29 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; f represents an integer of 1 to 7, and when R29 is present in plurality, R28's may be the same or different from each other; g represents an integer of 1 to 9, and when R29 is present in plurality, R29's may be the same or different from each other; and p represents an integer of 1 to 5, and when p is 2 or more, the plurality of naphthalenediyl groups may be the same or different from each other.
  • Further, it is preferred that the first compound and the second compound consist of only carbon and hydrogen.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a cross-sectional view illustrating a first embodiment of the organic light-emitting device of the present invention.
  • FIG. 2 is a cross-sectional view illustrating a second embodiment of the organic light-emitting device of the present invention.
  • FIG. 3 is a cross-sectional view illustrating a third embodiment of the organic light-emitting device of the present invention.
  • FIG. 4 is a cross-sectional view illustrating a fourth embodiment of the organic light-emitting device of the present invention.
  • FIG. 5 is a cross-sectional view illustrating a fifth embodiment of the organic light-emitting device of the present invention.
  • FIG. 6 is a cross-sectional view illustrating a sixth embodiment of the organic light-emitting device of the present invention.
    •  BEST MODE FOR CARRYING OUT THE INVENTION
  • The organic light-emitting device of the present invention will be described in detail.
  • The organic light-emitting device of the present invention is formed of an anode, a cathode, and a layer formed of an organic compound and interposed between the anode and the cathode. The layer formed of the organic compound contains the fused ring aromatic compound of the present invention. The organic light-emitting device of the present invention is preferably an electroluminescent device that emits light by applying a voltage between an anode and a cathode.
  • Hereinafter, the organic light-emitting device of the present invention will be described in detail with reference to the drawings.
  • First, reference numerals used in the figures will be described. Reference numeral 1 denotes a substrate, reference numeral 2 denotes an anode, reference numeral 3 denotes a light-emitting layer, reference numeral 4 denotes a cathode, reference numeral 5 denotes a hole-transporting layer, reference numeral 6 denotes an electron-transporting layer, reference numeral 7 denotes a hole injection layer, reference numeral 8 denotes a hole/exciton blocking layer, and reference numerals 10, 20, 30, 40, 50, and 60 each denote an organic light-emitting device.
  • FIG. 1 is a schematic cross-sectional view illustrating a first embodiment of the organic light-emitting device of the present invention. In the organic light-emitting device 10 shown in FIG. 1, there are sequentially provided on a substrate 1, an anode 2, a light-emitting layer 3 and a cathode 4. The configuration of the organic light-emitting device 10 is useful when the light-emitting layer 3 is composed of a compound having all of hole transporting ability, electron transporting ability and light emitting ability, or when the light-emitting layer 3 is composed of a mixture of compounds having the characteristics of any one of hole transporting ability, electron transporting ability, and light emitting ability.
  • FIG. 2 is a schematic cross-sectional view illustrating a second embodiment of the organic light-emitting device of the present invention. In the organic light-emitting device 20 shown in FIG. 2, there are sequentially provided on a substrate 1, an anode 2, a hole-transporting layer 5, an electron-transporting layer 6, and a cathode 4. The configuration of the organic light-emitting device 20 is useful when an organic compound having either one of hole transporting ability and electron transporting ability and an organic compound having only electron transporting ability or hole transporting ability are used in combination. Incidentally, in the organic light-emitting device 20 shown in FIG. 2, the hole-transporting layer 5 and the electron-transporting layer 6 each serve also as a light-emitting layer.
  • FIG. 3 is a schematic cross-sectional view illustrating a third embodiment of the organic light-emitting device of the present invention. The organic light-emitting device 30 shown in FIG. 3 is different from the organic light-emitting device 20 shown in FIG. 2 in that a light-emitting layer 3 is additionally provided between a hole-transporting layer 5 and an electron-transporting layer 6. The organic light-emitting device 30 has a configuration in which the functions of carrier transportation and light emission are separated from each other, so that organic compounds having characteristics of hole-transporting property, electron-transporting property and light-emitting property, respectively, can suitably be combined and used. Therefore, since the degree of freedom in selecting materials can significantly be increased, and further since various organic compounds having different emission wavelengths can be used, a wide variety of emission hues can be provided. Further, it also becomes possible to effectively confine carriers or excitons in the light-emitting layer 3 at the central portion, thereby improving the emission efficiency.
  • FIG. 4 is a schematic cross-sectional view illustrating a fourth embodiment of the organic light-emitting device of the present invention. The organic light-emitting device 40 shown in FIG. 4 is different from the organic light-emitting device 30 shown in FIG. 3 in that a hole injection layer 7 is additionally provided between an anode 2 and a hole-transporting layer 5. In the organic light-emitting device 40, by additionally providing the hole injection layer 7, the adhesion between the anode 2 and the hole-transporting layer 5 or the hole injection property is improved, so that the driving voltage can be effectively reduced.
  • FIG. 5 is a schematic cross-sectional view illustrating a fifth embodiment of the organic light-emitting device of the present invention. The organic light-emitting device 50 shown in FIG. 5 is different from the organic light-emitting device 30 shown in FIG. 3 in that a layer (hole/exciton blocking layer 8) for blocking holes or excitons from passing to a cathode 4 side is additionally provided between a light-emitting layer 3 and an electron-transporting layer 6. The configuration improves the emission efficiency of the organic light-emitting device 50 by using an organic compound with a significantly high ionization potential as the hole/exciton blocking layer 8.
  • FIG. 6 is a cross-sectional view illustrating a sixth embodiment of the organic light-emitting device of the present invention. The organic light-emitting device 60 shown in FIG. 6 is different from the organic light-emitting device 40 shown in FIG. 4 in that the hole/exciton-blocking layer 8 is additionally provided between the light-emitting layer 3 and the electron-transporting layer 6. By using an organic compound having an extremely high ionization potential as the hole/exciton blocking layer 8, the emission efficiency of the organic light-emitting device 60 can be improved.
  • FIGS. 1 to 6 merely show very basic device configurations and the configuration of the organic light-emitting device containing the naphthalene compound according to the present invention is not limited thereto. For example, it is possible to adopt various layer structures, such as one in which an insulating layer, an adhesive layer, or an interference layer is formed at an interface between an electrode and an organic layer. Further, a hole-transporting layer 5 is composed of two layers having different ionization potentials.
  • When a light-emitting layer is formed of a carrier transporting host and a guest, the process for light emission is composed of the following several steps.
  • 1. Transportation of electrons/holes in the light-emitting layer
  • 2. Generation of excitons in the host
  • 3. Transmission of excitation energy between host molecules
  • 4. Transfer of the excitation energy from the host to the guest
  • The desired energy transfer and light emission in the respective steps are caused in competition with various deactivation steps.
  • Incidentally, the term “guest” as herein employed refers to a compound that emits light in response to recombination between holes and electrons in an emission region of the organic light-emitting device, and the guest is contained, together with a substance (host) forming the emission region, in the light-emitting layer 3.
  • The emission region may be either a region of one layer or an interface between a plurality of layers, and is preferably one layer. A layer having an emission region may be called “light-emitting layer (or emission layer)”.
  • In order to increase the emission efficiency of an organic light-emitting device, the emission quantum yield of a luminescent center material itself needs to be increased. However, how high efficiency of energy transfer between hosts or between a host and a guest can be achieved is also a large problem. In addition, the cause for degradation of light emission due to energization has not been clarified yet. However, it is assumed that the degradation is related at least to a luminescent center material itself or an environmental change of a light-emitting material due to surrounding molecules.
  • In the present invention, a first compound represented by the following general formula (I) is used as a guest and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than the energy gap of the first compound is used as a host in a light-emitting layer 3.
  • Figure US20120056172A1-20120308-C00007
  • In the general formula (I), R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom.
  • The compound represented by the general formula (I) has a high quantum yield. When this compound is used as a guest and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than the energy gap of the first compound is used as a host, a device having a high emission efficiency and a long life can be provided. Organic materials suitable for each of the guest material and the host material will be described below in detail.
  • A guest material is a compound represented by the following general formula (I):
  • Figure US20120056172A1-20120308-C00008
  • wherein R1, R2, R3, R4, R5, R6, R7, R3, R9, R10, R11, R12, R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, a cyclohexyl group, or a trifluoromethyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a perylenyl group; a heterocyclic group such as a thienyl group, a pyrrolyl group, a pyridyl group, an oxazolyl group, an oxadiazolyl group, a thiazolyl group, or a thiadiazolyl group; an amino group such as a dimethylamino group, a diethylamino group, a dibenzylamino group, a diphenylamino group, a ditolylamino group, or a dianisolylamino group; and a halogen atom such as fluorine, chlorine, bromine or iodine.
  • The content of the compound used as a guest is preferably 50% by weight or less based on the total weight of materials constituting a light-emitting layer. The content is more preferably 0.1% by weight or more and 30% by weight or less, particularly preferably 0.1% by weight or more and 15% by weight or less from the viewpoint of energy transfer from a host to a light-emitting guest.
  • Further, electrons of a lone electron pair can coordinate with metal or a Lewis acid material and thus a compound having a lone electron pair can act as a ligand or a Lewis base. Therefore, the compound tends to hold impurities therein. In addition, it is considered that association and chemical reaction with surrounding molecules may be caused in an organic light-emitting device. Accordingly, a compound consisting of only carbon and hydrogen is particularly preferable as a guest material.
  • Hereinafter, specific structural formulas of the guest used in the present invention are shown below. However, these structural formulas represent only typical examples and the present invention should not be limited to these formulas.
  • Figure US20120056172A1-20120308-C00009
    Figure US20120056172A1-20120308-C00010
    Figure US20120056172A1-20120308-C00011
    Figure US20120056172A1-20120308-C00012
    Figure US20120056172A1-20120308-C00013
    Figure US20120056172A1-20120308-C00014
    Figure US20120056172A1-20120308-C00015
    Figure US20120056172A1-20120308-C00016
    Figure US20120056172A1-20120308-C00017
    Figure US20120056172A1-20120308-C00018
    Figure US20120056172A1-20120308-C00019
    Figure US20120056172A1-20120308-C00020
    Figure US20120056172A1-20120308-C00021
    Figure US20120056172A1-20120308-C00022
    Figure US20120056172A1-20120308-C00023
    Figure US20120056172A1-20120308-C00024
    Figure US20120056172A1-20120308-C00025
    Figure US20120056172A1-20120308-C00026
    Figure US20120056172A1-20120308-C00027
    Figure US20120056172A1-20120308-C00028
    Figure US20120056172A1-20120308-C00029
    Figure US20120056172A1-20120308-C00030
  • Next, the host material will be specifically described.
  • Since the guest is a compound having a relatively large fused ring represented by the above-mentioned general formula (I), the host is also preferably a fused ring aromatic compound from the viewpoint of compatibility between the host and the guest. Further, according to the investigation of the present inventors, it has been found that a pyrene skeleton material and a fluorene skeleton material are particularly excellent in carrier-transporting property. Furthermore, in a compound containing a heteroatom, the mobility of either of electrons or holes is higher than that of the other, while in a pyrene skeleton material and a fluorene skeleton material, the mobilities of both of electrons and holes are relatively high, and the difference between the mobilities of electrons and holes is also small. In addition, when a light-emitting layer is formed of this material, a HOMO gap between a guest and a host and a LUMO gap between the guest and the host have a preferable relationship with each other. Accordingly, a device having a high emission efficiency and a long life in which the electron/hole carrier balance in the light-emitting layer is maintained can be provided. Furthermore, a compound having both of a fluorene ring and a pyrene ring in a host molecule is particularly preferable from the viewpoint of carrier-transporting property.
  • As the host compound used in the present invention, it is preferable to use the compound represented by the following general formula (II):
  • Figure US20120056172A1-20120308-C00031
  • wherein R21, R22, R23, and R24 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a perylenyl group.
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group. Here, a and b each independently represent an integer of 1 to 4, and when there are a plurality of any of R23 and R24, they may be the same or different from each other. Further, m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • Specific examples of the general formula (II) include the structures shown as below, but the present invention should not be limited to these structures.
  • Figure US20120056172A1-20120308-C00032
    Figure US20120056172A1-20120308-C00033
    Figure US20120056172A1-20120308-C00034
    Figure US20120056172A1-20120308-C00035
    Figure US20120056172A1-20120308-C00036
  • As the host compound used in the present invention, it is preferable to use a compound represented by the following general formula (III):
  • Figure US20120056172A1-20120308-C00037
  • wherein R21, R22, R23, and R25 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a perylenyl group.
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group.
  • Here, a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other. Further, c represents an integer of 1 to 9, and when R25 is present in plurality, R25's may be the same or different from each other. Moreover, m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
  • Specific examples of the general formula (III) include the structures shown as below, but the present invention should not be limited to these structures.
  • Figure US20120056172A1-20120308-C00038
    Figure US20120056172A1-20120308-C00039
    Figure US20120056172A1-20120308-C00040
    Figure US20120056172A1-20120308-C00041
    Figure US20120056172A1-20120308-C00042
    Figure US20120056172A1-20120308-C00043
    Figure US20120056172A1-20120308-C00044
    Figure US20120056172A1-20120308-C00045
    Figure US20120056172A1-20120308-C00046
    Figure US20120056172A1-20120308-C00047
    Figure US20120056172A1-20120308-C00048
    Figure US20120056172A1-20120308-C00049
  • Further, as the host compound used in the present invention, it is preferable to use a compound represented by the following general formula (IV):
  • Figure US20120056172A1-20120308-C00050
  • wherein R21, R22, R23, R26, and R27 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a perylenyl group.
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group.
  • Here, a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other. Further, d represents an integer of 1 to 4, and when R26 is present in plurality, R26's may be the same or different from each other. Moreover, e represents an integer of 1 to 9, and when R27 is present in plurality, R27's may be the same or different from each other. Furthermore, m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other. In addition, n represents an integer of 1 to 5, and when n is 2 or more, the plurality of phenylene groups may be the same or different from each other.
  • Specific examples of the general formula (IV) include the structures shown as below, but the present invention should not be limited to these structures.
  • Figure US20120056172A1-20120308-C00051
    Figure US20120056172A1-20120308-C00052
    Figure US20120056172A1-20120308-C00053
  • Further, as the host compound used in the present invention, it is preferable to use a compound represented by the following general formula (V):
  • Figure US20120056172A1-20120308-C00054
  • wherein R28 and R29 each represent, independently of one another, a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, an octyl group, or a cyclohexyl group; an aralkyl group such as benzyl group or a phenethyl group; an aryl group such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, or a perylenyl group.
  • Examples of the substituents which the above-mentioned aralkyl group and the above-mentioned aryl group may further have include, alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a tertiary butyl group, and a cyclohexyl group; aralkyl groups such as a benzyl group and a phenethyl group; aryl groups such as a phenyl group, a biphenyl group, a terphenyl group, fluorenyl group, a naphthyl group, a fluoranthenyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a triphenylenyl group, and a perylenyl group.
  • Here, f represents an integer of 1 to 7, and when R28 is present in plurality, R28's may be the same or different from each other.
  • Further, g represents an integer of 1 to 9, and when R29 is present in plurality, R29's may be the same or different from each other.
  • Moreover, p represents an integer of 1 to 5, and when p is 2 or more, the plurality of naphthalenediyl groups may be the same or different from each other.
  • Specific examples of the general formula (V) include the structures shown as below, but the present invention should not be limited to these structures.
  • Figure US20120056172A1-20120308-C00055
    Figure US20120056172A1-20120308-C00056
    Figure US20120056172A1-20120308-C00057
  • Specific examples of the host compound having a pyrene skeleton usable for the present invention include structures as shown below, but the present invention should not be limited to these structures.
  • Figure US20120056172A1-20120308-C00058
    Figure US20120056172A1-20120308-C00059
    Figure US20120056172A1-20120308-C00060
    Figure US20120056172A1-20120308-C00061
    Figure US20120056172A1-20120308-C00062
  • The host materials represented by the general formulae (II) to (V) of the present invention can provide the following excellent characteristics from the molecular structures.
  • (1) The amorphous property is extremely excellent and the heat resistance is high.
    (2) For both of electrons and holes, a preferable carrier injection level can easily be obtained.
  • Further, the following excellent characteristics can be easily obtained by the combination of the host material with the guest represented by the general formula (I).
  • (3) There is achieved good energy transfer from the host to the dopant. It is important that an energy gap E1 of a guest material and an energy gap E2 of a host material satisfy E1<E2.
    (4) The fluorene skeleton host or pyrene skeleton host is highly compatible with the guest represented by the general formula (I) and the light-emitting dopant is well dispersed in a film. Therefore, reduction of the efficiency and reduction of the life due to association of the light-emitting dopant can be suppressed. It is preferable from the viewpoint of compatibility that the host material and the light-emitting dopant are hydrocarbon compounds.
  • In the organic light-emitting device of the present invention, the fused ring aromatic compound of the present invention is preferably used as a component constituting either an electron-transporting layer or a light-emitting layer, but a hitherto known hole-transporting compound, light-emitting compound or an electron-transporting compound can also be used together, as needed
  • Examples of these compounds are shown below.
    • Hole-Transporting Compounds
  • Figure US20120056172A1-20120308-C00063
    Figure US20120056172A1-20120308-C00064
    • Electron-Transporting/Light-Emitting Materials
  • Figure US20120056172A1-20120308-C00065
    Figure US20120056172A1-20120308-C00066
    • Light-Emitting Materials
  • Figure US20120056172A1-20120308-C00067
    Figure US20120056172A1-20120308-C00068
    • Light-Emitting Layer Matrix Materials and Electron-Transporting Materials
  • Figure US20120056172A1-20120308-C00069
    Figure US20120056172A1-20120308-C00070
  • An anode material used for the organic light-emitting device of the present invention preferably has as large a work function as possible, and includes, for instance, an elemental metal such as gold, platinum, nickel, palladium, cobalt, selenium, and vanadium, an alloy thereof, and a metal oxide such as tin oxide, zinc oxide, indium tin oxide (ITO) and indium zinc oxide. Further, a conductive polymer such as polyaniline, polypyrrole, polythiophene and polyphenylene sulfide can be employed. These electrode materials can be used singly or in combination.
  • On the other hand, a cathode material used for the organic light-emitting device of the present invention preferably has a low work function, and include, for instance, an elemental metal such as lithium, sodium, potassium, cesium, calcium, magnesium, aluminum, indium, silver, lead, tin, and chromium. Alternatively, an alloy made of a plurality of the above metals can also be used. A metal oxide such as indium tin oxide (ITO) can be also utilized. In addition, the cathode may be either of a single layer configuration or of a multilayer configuration.
  • A substrate used for the organic light-emitting device of the present invention is not particularly limited, but an opaque substrate such as a metal substrate and a ceramic substrate or a transparent substrate such as glass, quartz, and a plastic sheet is used. Further, it is also possible to employ, for a substrate, a color filter film, a fluorescent color conversion filter film and a dielectric reflection film to thereby control the emission color.
  • Incidentally, after the organic light-emitting device has been produced, a protective layer or an encapsulation layer may further be provided, for the purpose of preventing contact with oxygen or moisture. Examples of such a protective layer include a diamond thin film; a film of an inorganic material such as a metal oxide and a metal nitride; a film of a polymer such as a fluororesin, poly-p-xylene, polyethylene, silicone resin, and polystyrene resin; and further a photocurable resin. Further, the produced device may also be covered with glass, a gas-impermeable film and a metal, or be packaged with a suitable encapsulation resin.
  • In the organic light-emitting device of the present invention, a layer containing the fused ring aromatic compound of the present invention and other layers containing an inorganic compound are formed by the below-mentioned methods. Generally, a thin film is formed by a vacuum evaporation method or a coating method of applying an organic compound dissolved in a suitable solvent. Particularly, when the film is formed by the coating method, the film can be formed by additionally using a suitable binder resin.
  • The above described binder resin can be selected from a wide range of binding resins, and includes, for instance, polyvinylcarbazole resin, polycarbonate resin, polyester resin, polyarylate resin, polystyrene resin, acrylic resin, methacrylic resin, butyral resin, polyvinylacetal resin, diallylphthalate resin, phenolic resin, epoxy resin, silicone resin, polysulfonic resin and urea resin, but is not limited to them.
  • In the organic light-emitting device of the present invention, a layer including the fused ring aromatic compound of the present invention is made to have a film thickness of 10 μm or less, preferably 0.5 μm or less, and more preferably 0.01 μm or more and 0.5 μm or less.
    • EXAMPLES
  • The present invention will be more specifically described below by means of examples, but should not be limited to these examples.
    • Example 1
  • On a glass substrate, indium tin oxide (ITO) was formed into a film in a thickness of 120 nm as an anode 2 by a sputtering method. Next, the glass substrate having the ITO film formed thereon was ultrasonically cleaned sequentially with acetone and isopropyl alcohol (IPA), subsequently washed with boiled IPA, then dried, and further cleaned with UV/ozone. The glass substrate thus treated was used as a transparent conductive support substrate.
  • Next, as a hole-transporting layer, a film was formed in a thickness of 20 nm on the transparent conductive support substrate by spin coating of a solution of Compound 1 represented by the following formula in chloroform.
  • Figure US20120056172A1-20120308-C00071
  • Further, other organic layers and an electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10−5 Pa to produce an organic light-emitting device. To be specific, first, as a light-emitting layer, a film was formed in a thickness of 30 nm by coevaporation of Exemplified Compound No. A-2 as a guest and HB-51 as a host represented by the following formulae in such a manner that the content of Exemplified Compound No. A-2 was 5 wt % of the entirety of the light-emitting layer.
  • Figure US20120056172A1-20120308-C00072
  • Next, as an electron-transporting layer, a film of Compound 2 represented by the formula above was formed in a thickness of 40 nm. Then, as a first metal electrode layer, a film of LiF was formed in a thickness of 0.5 nm. Finally, as a second metal electrode layer, a film of Al was formed in a thickness of 150 nm.
  • The characteristics of the thus produced organic light-emitting device were examined. Specifically, the current-voltage characteristics of the device were measured with a pico-amp meter (Hewlett Packard 4140B), and the emission luminance of the device was measured with a BM7 manufactured by TOPCON CORPORATION. As a result, the device of this example was observed to emit green light with an emission luminance of 2,000 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 30 mA/cm2 for 100 hours, the luminance was reduced from about 3,100 cd/m2 at an initial stage to about 3,000 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.34 and y=0.60.
    • Example 2
  • A device was produced by following the same procedure as in Example 1 with the exception that Exemplified Compound No. A-11 shown below was used instead of Exemplified Compound No. A-2 as a guest for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00073
  • The device of this example was observed to emit green light with an emission luminance of 1,900 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 30 mA/cm2 for 100 hours, the luminance was reduced from about 3,000 cd/m2 at an initial stage to about 2,900 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.35 and y=0.60.
    • Example 3
  • A device was produced by following the same procedure as in Example 1 with the exception that Exemplified Compound No. B-20 shown below was used instead of Exemplified Compound No. A-2 as a guest for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00074
  • The device of this example was observed to emit green light with an emission luminance of 2,400 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 30 mA/cm2 for 100 hours, the luminance was reduced from about 3,700 cd/m2 at an initial stage to about 3,550 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.30 and y=0.65.
    • Example 4
  • A device was produced by following the same procedure as in Example 1 with the exception that Exemplified Compound No. B-1 shown below was used instead of Exemplified Compound No. A-2 as a guest for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00075
  • The device of this example was observed to emit green light with an emission luminance of 2,200 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 30 mA/cm2 for 100 hours, the luminance was reduced from about 3,500 cd/m2 at an initial stage to about 3,400 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.30 and y=0.65.
    • Example 5
  • An electrode as an anode and a hole-transporting layer were formed on a substrate by following the same procedure as in Example 1.
  • Further, the following organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10−5 Pa to produce an organic light-emitting device.
      • Light-emitting layer (thickness: 30 nm) using Exemplified Compound E-4 (2 wt %) and HB-51
      • Electron-transporting layer (thickness: 40 nm) using Compound 2
      • Metal electrode layer 1 (thickness: 0.5 nm) using LiF
      • Metal electrode layer 2 (thickness: 150 nm) using Al
  • Figure US20120056172A1-20120308-C00076
  • The device of this example was observed to emit green light with an emission luminance of 4,000 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 15,500 cd/m2 at an initial stage to about 14,700 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.28 and y=0.65.
    • Example 6
  • An electrode as an anode and a hole-transporting layer were formed on a substrate by following the same procedure as in Example 1.
  • Further, the following organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10−5 Pa to produce an organic light-emitting device.
      • Light-emitting layer (thickness: 30 nm) using Exemplified Compound E-4 (2 wt %) and HB-51
      • Hole/exciton blocking layer (thickness: 10 nm) using BAlq
      • Electron-transporting layer (thickness: 30 nm) using Compound 2
      • Metal electrode layer 1 (thickness: 0.5 nm) using LiF
      • Metal electrode layer 2 (thickness: 150 nm) using Al
  • Figure US20120056172A1-20120308-C00077
  • The device of this example was observed to emit green light with an emission luminance of 3,690 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 18,400 cd/m2 at an initial stage to about 16,600 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.29 and y=0.63.
    • Example 7
  • A device was produced by following the same procedure as in Example 5 with the exception that Exemplified Compound No. E-48 shown below was used instead of Exemplified Compound No. E-4 as a guest for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00078
  • The device of this example was observed to emit green light with an emission luminance of 4,200 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 14,900 cd/m2 at an initial stage to about 14,000 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.28 and y=0.63.
    • Example 8
  • A device was produced by following the same procedure as in Example 5 with the exception that Exemplified Compound No. C-11 shown below was used instead of Exemplified Compound No. E-4 as a guest for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00079
  • The device of this example was observed to emit green light with an emission luminance of 4,500 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 18,500 cd/m2 at an initial stage to about 18,200 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.32 and y=0.64.
    • Example 9
  • An electrode as an anode and a hole-transporting layer were formed on a substrate by following the same procedure as in Example 1.
  • Further, the following organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10−5 Pa to produce an organic light-emitting device.
      • Light-emitting layer (thickness: 30 nm) using Exemplified Compound A-2 (2 wt %) and HA-3
      • Electron-transporting layer (thickness: 40 nm) using Compound 2
      • Metal electrode layer 1 (thickness: 0.5 nm) using LiF
      • Metal electrode layer 2 (thickness: 150 nm) using Al
  • Figure US20120056172A1-20120308-C00080
  • The device of this example was observed to emit green light with an emission luminance of 350 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 8,500 cd/m2 at an initial stage to about 7,000 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.28 and y=0.64.
    • Example 10
  • A device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HB-55 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00081
  • The device of this example was observed to emit green light with an emission luminance of 4,000 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 15,500 cd/m2 at an initial stage to about 15,000 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.30 and y=0.64.
    • Example 11
  • A device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HB-25 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00082
  • The device of this example was observed to emit green light with an emission luminance of 4,000 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 30 mA/cm2 for 100 hours, the luminance was reduced from about 4,500 cd/m2 at an initial stage to about 4,300 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.30 and y=0.64.
    • Example 12
  • A device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HC-1 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00083
  • The device of this example was observed to emit green light with an emission luminance of 3,800 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 13,000 cd/m2 at an initial stage to about 11,000 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.27 and y=0.63.
    • Example 13
  • A device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HA-47 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00084
  • The device of this example was observed to emit green light with an emission luminance of 8,000 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 13,300 cd/m2 at an initial stage to about 11,000 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.28 and y=0.64.
    • Example 14
  • A device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HD-4 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00085
  • The device of this example was observed to emit green light with an emission luminance of 5,000 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 16,100 cd/m2 at an initial stage to about 16,000 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.30 and y=0.64.
    • Example 15
  • A device was produced by following the same procedure as in Example 9 with the exception that Exemplified Compound No. HD-8 shown below was used instead of Exemplified Compound No. HA-3 as a guest for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00086
  • The device of this example was observed to emit green light with an emission luminance of 4,800 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2 for 100 hours, the luminance was reduced from about 14,800 cd/m2 at an initial stage to about 14,700 cd/m2 after the elapse of the 100 hours, which meant that the luminance degradation was small. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.28 and y=0.65.
    • Example 16
  • A thin film transistor (TFT) was formed on a glass substrate as a transparent substrate. On the TFT, a film of polyimide was formed, followed by exposure, development and baking to thereby form a planarizing film. At this stage, contact holes were formed in advance, and electrodes formed in the subsequent steps were connected to the TFT through the contact holes.
  • Next, an Al film was formed in a thickness of 100 nm on the planarizing film, and then an insulating film of a polyimide resin for pixel separation was stacked thereon and patterned.
  • Further, the following organic layers and electrode layer serving as a cathode were successively formed by vacuum evaporation using resistive heating in a vacuum chamber at an inner pressure of 10−5 Pa to produce an organic light-emitting device.
      • Hole-transporting layer (thickness: 110 nm) using Compound 1
      • Light-emitting layer (thickness: 20 nm) using
      • Exemplified Compound C-11 (2 wt %) and HB-51
      • Hole/exciton blocking layer (thickness: 10 nm) using BAlq
      • Electron-transporting layer 1 (thickness: 10 nm) using Compound 2
      • Electron-transporting layer 2 (thickness: 60 nm) using Cs2CO3 (2 wt %) and Compound 2
  • The device of this example was observed to emit green light with an emission luminance of 10,000 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2, the device showed a high efficiency of 24,400 cd/m2. In addition, the device was observed to emit green light of good color purity with CIE chromaticity coordinates of x=0.25 and y=0.69.
    • Comparative Example 1
  • A device was produced by following the same procedure as in Example 9 with the exception that Comparative Compound 1 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00087
  • The device of this comparative example was observed to emit orange light resulting from Comparative Compound 1 as the host, and emission of green light intended by the present invention was not obtained. This is because the energy gap of the compound having the structure represented by the general formula (I) used in the present invention is larger than an energy gap of a compound having a tetracene skeleton.
    • Comparative Example 2
  • A device was produced by following the same procedure as in Example 9 with the exception that Comparative Compound 2 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00088
  • The device of this comparative example was observed to emit green light with an emission luminance of 360 cd/m2 at an applied voltage of 6.0 V.
  • Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2, the device showed a small efficiency of about 7,500 cd/m2. Further, when the voltage was continued to be applied to the device for 100 hours, the luminance was reduced from about 7,500 cd/m2 at the initial stage to about 5,000 cd/m2 after the elapse of the 100 hours, which degradation was larger than those of the compounds having a pyrene skeleton or a fluorene skeleton. In addition, the CIE chromaticity coordinates were x=0.28 and y=0.64.
    • Comparative Example 3
  • A device was produced by following the same procedure as in Example 9 with the exception that Comparative Compound 3 shown below was used instead of Exemplified Compound No. HA-3 as a host for the light-emitting layer.
  • Figure US20120056172A1-20120308-C00089
  • The device of this comparative example was observed to emit green light with an emission luminance of 4,400 cd/m2 at an applied voltage of 6.0 V. Further, when a voltage was applied to the device in a nitrogen atmosphere at a current density of 100 mA/cm2, the device showed a luminance of about 3,000 cd/m2, which efficiency was significantly lower than those of the compounds having a pyrene skeleton or a fluorene skeleton. In addition, the CIE chromaticity coordinates were x=0.35 and y=0.60.
  • As described, according to the present invention, there can be obtained a green-light-emitting device which has a high emission efficiency and a long continuous operational life.
  • The present invention is not limited to the above embodiments and various changes and modifications can be made within the spirit and scope of the present invention. Therefore to apprise the public of the scope of the present invention, the following claims are made.
  • This application claims priorities from Japanese Patent Applications No. 2007-060609, filed Mar. 9, 2007, and No. 2008-023232, filed Feb. 1, 2008, which are hereby incorporated by reference herein.

Claims (18)

1.-7. (canceled)
8. An apparatus comprising:
an opaque substrate;
an organic light-emitting device; and
a color filter,
wherein the organic light-emitting device comprises:
a pair of electrodes including an anode and a cathode; and
a layer comprising an organic compound disposed between the pair of electrodes,
wherein the layer comprises a first compound represented by the general formula (I):
Figure US20120056172A1-20120308-C00090
wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom; and
a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than an energy gap of the first compound, and
wherein each of the combinations of R1 and R9, R2 and R10, R3 and R11, R4 and R12, R5 and R13, R6 and R14, R7 and R15, and R8 and R16 is a combination of the same substituents.
9. The apparatus according to claim 8, wherein the second compound has a pyrene skeleton and a fluorene skeleton.
10. The apparatus according to claim 8, wherein the second compound is represented by the general formula (II):
Figure US20120056172A1-20120308-C00091
wherein R21, R22, R23, and R24 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a and b each independently represent an integer of 1 to 4, and when there are a plurality of any of R23 and R24, they may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
11. The apparatus according to claim 8, wherein the second compound is represented by the general formula (III):
Figure US20120056172A1-20120308-C00092
wherein R21, R22, R23, and R25 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other; c represents an integer of 1 to 9, and when R25 is present in plurality, R25's may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
12. The apparatus according to claim 8, wherein the second compound is represented by the general formula (IV):
Figure US20120056172A1-20120308-C00093
wherein R21, R22, R23, R26, and R27 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other; d represents an integer of 1 to 4, and when R26 is present in plurality, R26's may be the same or different from each other; e represents an integer of 1 to 9, and when R27 is present in plurality, R27's may be the same or different from each other; m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other; and n represents an integer of 1 to 5, and when n is 2 or more, the plurality of phenylene groups may be the same or different from each other.
13. The apparatus according to claim 8, wherein the second compound is represented by the general formula (V):
Figure US20120056172A1-20120308-C00094
wherein R28 and R29 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; f represents an integer of 1 to 7, and when R28 is present in plurality, R28's may be the same or different from each other; g represents an integer of 1 to 9, and when R29 is present in plurality, R29's may be the same or different from each other; and p represents an integer of 1 to 5, and when p is 2 or more, the plurality of naphthalenediyl groups may be the same or different from each other.
14. The apparatus according to claim 8, wherein the first compound and the second compound consist of only carbon and hydrogen.
15. An apparatus comprising:
a transparent substrate;
an organic light-emitting device; and
a color filter,
wherein the organic light-emitting device comprises:
a pair of electrodes including an anode and a cathode; and
a layer comprising an organic compound disposed between the pair of electrodes,
wherein the layer comprises a first compound represented by the general formula (I):
Figure US20120056172A1-20120308-C00095
wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom; and
a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than an energy gap of the first compound, and
wherein each of the combinations of R1 and R9, R2 and R10, R3 and R11, R4 and R12, R5 and R13, R6 and R14, R7 and R15, and R8 and R16 is a combination of the same substituents.
16. The apparatus according to claim 15, wherein the second compound has a pyrene skeleton and a fluorene skeleton.
17. The apparatus according to claim 15, wherein the second compound is represented by the general formula (II):
Figure US20120056172A1-20120308-C00096
wherein R21, R22, R23, and R24 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a and b each independently represent an integer of 1 to 4, and when there are a plurality of any of R23 and R24, they may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
18. The apparatus according to claim 15, wherein the second compound is represented by the general formula (III):
Figure US20120056172A1-20120308-C00097
wherein R21, R22, R23, and R25 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other; c represents an integer of 1 to 9, and when R25 is present in plurality, R25's may be the same or different from each other; and m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other.
19. The apparatus according to claim 15, wherein the second compound is represented by the general formula (IV):
Figure US20120056172A1-20120308-C00098
wherein R21, R22, R23, R26, and R27 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; a represents an integer of 1 to 4, and when R23 is present in plurality, R23's may be the same or different from each other; d represents an integer of 1 to 4, and when R26 is present in plurality, R26's may be the same or different from each other; e represents an integer of 1 to 9, and when R27 is present in plurality, R27's may be the same or different from each other; m represents an integer of 1 to 5, and when m is 2 or more, the plurality of fluorenediyl groups may be the same or different from each other; and n represents an integer of 1 to 5, and when n is 2 or more, the plurality of phenylene groups may be the same or different from each other.
20. The apparatus according to claim 15, wherein the second compound is represented by the general formula (V):
Figure US20120056172A1-20120308-C00099
wherein R28 and R29 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; f represents an integer of 1 to 7, and when R28 is present in plurality, R28's may be the same or different from each other; g represents an integer of 1 to 9, and when R29 is present in plurality, R29's may be the same or different from each other; and p represents an integer of 1 to 5, and when p is 2 or more, the plurality of naphthalenediyl groups may be the same or different from each other.
21. The apparatus according to claim 15, wherein the first compound and the second compound consist of only carbon and hydrogen.
22. The apparatus according to any one of claims 15 to 21, further comprising a TFT connected to the organic light-emitting device.
23. The apparatus according to any one of claims 15 to 21, further comprising glass which covers the organic light-emitting device.
24. An apparatus comprising:
a transparent substrate;
an organic light-emitting device; and
glass which covers the organic light-emitting device,
wherein the organic light-emitting device comprises:
a pair of electrodes including an anode and a cathode; and
a layer comprising an organic compound disposed between the pair of electrodes,
wherein the layer comprises a first compound represented by the general formula (I):
Figure US20120056172A1-20120308-C00100
wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom; and
a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than an energy gap of the first compound, and
wherein each of the combinations of R1 and R9, R2 and R10, R3 and R11, R4 and R12, R5 and R13, R6 and R14, R7 and R15, and R8 and R16 is a combination of the same substituents.
US13/298,623 2007-03-09 2011-11-17 Organic light-emitting device Abandoned US20120056172A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/298,623 US20120056172A1 (en) 2007-03-09 2011-11-17 Organic light-emitting device

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2007-060609 2007-03-09
JP2007060609 2007-03-09
JP2008-023232 2008-02-01
JP2008023232A JP5111135B2 (en) 2007-03-09 2008-02-01 Organic light emitting device
US12/296,074 US8084147B2 (en) 2007-03-09 2008-03-03 Organic light-emitting device
PCT/JP2008/054226 WO2008111543A1 (en) 2007-03-09 2008-03-03 Organic light-emitting device
US13/298,623 US20120056172A1 (en) 2007-03-09 2011-11-17 Organic light-emitting device

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
PCT/JP2008/054226 Continuation WO2008111543A1 (en) 2007-03-09 2008-03-03 Organic light-emitting device
US12/296,074 Continuation US8084147B2 (en) 2007-03-09 2008-03-03 Organic light-emitting device

Publications (1)

Publication Number Publication Date
US20120056172A1 true US20120056172A1 (en) 2012-03-08

Family

ID=39759479

Family Applications (2)

Application Number Title Priority Date Filing Date
US12/296,074 Active 2030-03-14 US8084147B2 (en) 2007-03-09 2008-03-03 Organic light-emitting device
US13/298,623 Abandoned US20120056172A1 (en) 2007-03-09 2011-11-17 Organic light-emitting device

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US12/296,074 Active 2030-03-14 US8084147B2 (en) 2007-03-09 2008-03-03 Organic light-emitting device

Country Status (6)

Country Link
US (2) US8084147B2 (en)
EP (1) EP2121547B1 (en)
JP (1) JP5111135B2 (en)
KR (1) KR101101037B1 (en)
AT (1) ATE495141T1 (en)
WO (1) WO2008111543A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5111135B2 (en) * 2007-03-09 2012-12-26 キヤノン株式会社 Organic light emitting device
JP5241256B2 (en) * 2007-03-09 2013-07-17 キヤノン株式会社 Fused ring aromatic compound and organic light emitting device using the same
JP5294650B2 (en) * 2007-03-12 2013-09-18 キヤノン株式会社 Naphthalene compound and organic light emitting device using the same
JP5618495B2 (en) * 2008-05-16 2014-11-05 キヤノン株式会社 Organic light emitting device
JP5335284B2 (en) * 2008-05-22 2013-11-06 キヤノン株式会社 Fused polycyclic compound and organic light emitting device having the same
JP5376857B2 (en) * 2008-08-04 2013-12-25 キヤノン株式会社 Fused polycyclic compound and organic light emitting device using the same
JP2010123917A (en) * 2008-10-22 2010-06-03 Canon Inc Organic light-emitting device
US9153790B2 (en) 2009-05-22 2015-10-06 Idemitsu Kosan Co., Ltd. Organic electroluminescent device
WO2011077691A1 (en) * 2009-12-21 2011-06-30 出光興産株式会社 Organic electroluminescent element using pyrene derivative
CN102471190A (en) * 2009-12-21 2012-05-23 出光兴产株式会社 Pyrene derivative and organic electroluminescent element using same
JP6470495B2 (en) * 2013-03-07 2019-02-13 キヤノン株式会社 Electrophotographic photoreceptor, electrophotographic apparatus and process cartridge having the electrophotographic photoreceptor
JP2016115940A (en) 2014-12-12 2016-06-23 出光興産株式会社 Organic electroluminescent element and electronic apparatus
US11094886B2 (en) * 2019-09-13 2021-08-17 Idemitsu Kosan Co., Ltd. Organic electroluminescent element and electronic device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8084147B2 (en) * 2007-03-09 2011-12-27 Canon Kabushiki Kaisha Organic light-emitting device

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3824417B2 (en) 1997-04-04 2006-09-20 三井化学株式会社 Hydrocarbon compounds and organic electroluminescent devices
JP3662104B2 (en) 1997-12-10 2005-06-22 三井化学株式会社 Organic electroluminescence device
JP4255610B2 (en) * 1999-12-28 2009-04-15 出光興産株式会社 White organic electroluminescence device
JP4024009B2 (en) 2000-04-21 2007-12-19 Ｔｄｋ株式会社 Organic EL device
JP4330058B2 (en) * 2000-09-27 2009-09-09 三井化学株式会社 Hydrocarbon compounds and organic electroluminescent devices
JP4482214B2 (en) 2000-09-28 2010-06-16 三井化学株式会社 Hydrocarbon compounds and organic electroluminescent devices
JP4462753B2 (en) 2000-12-01 2010-05-12 三井化学株式会社 Hydrocarbon compounds and organic electroluminescent devices
US20070063638A1 (en) 2004-02-19 2007-03-22 Idemitsu Kosan Co., Ltd. White color organic electroluminescence device
JP2006140235A (en) * 2004-11-10 2006-06-01 Idemitsu Kosan Co Ltd Organic electroluminescence element
JP4429149B2 (en) 2004-11-26 2010-03-10 キヤノン株式会社 Fluorene compound and organic light emitting device
JP4659695B2 (en) 2005-11-01 2011-03-30 キヤノン株式会社 Fluorene compound and organic light emitting device
US20090066227A1 (en) * 2005-12-20 2009-03-12 Canon Kabushiki Kaisha Organic light-emitting device
JP2007227152A (en) * 2006-02-23 2007-09-06 Idemitsu Kosan Co Ltd White color group organic electroluminescent element
JP4164514B2 (en) 2006-04-28 2008-10-15 キヤノン株式会社 Organic compound and organic light emitting device
JP5241256B2 (en) * 2007-03-09 2013-07-17 キヤノン株式会社 Fused ring aromatic compound and organic light emitting device using the same
JP4827775B2 (en) 2007-03-13 2011-11-30 キヤノン株式会社 Electroluminescent device
JP2008300753A (en) * 2007-06-04 2008-12-11 Mitsui Chemicals Inc Organic transistor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8084147B2 (en) * 2007-03-09 2011-12-27 Canon Kabushiki Kaisha Organic light-emitting device

Also Published As

Publication number Publication date
EP2121547A4 (en) 2009-12-23
KR20090126240A (en) 2009-12-08
EP2121547B1 (en) 2011-01-12
ATE495141T1 (en) 2011-01-15
JP2008258580A (en) 2008-10-23
KR101101037B1 (en) 2011-12-29
WO2008111543A1 (en) 2008-09-18
JP5111135B2 (en) 2012-12-26
EP2121547A1 (en) 2009-11-25
US20090278446A1 (en) 2009-11-12
US8084147B2 (en) 2011-12-27

Similar Documents

Publication Publication Date Title
US8084147B2 (en) Organic light-emitting device
US7923129B2 (en) Carbazole derivative and organic light emitting device using the same
US7960041B2 (en) Fused ring aromatic compound and organic light-emitting device using same
US7833634B2 (en) 1,8-naphthyridine compound and organic light-emitting device using the same
US7977869B2 (en) Organic luminescent device and benzo[k]fluoranthene compound
US6994922B2 (en) Organic luminescence device with a fused polynuclear compound
US7749617B2 (en) Organic compound and organic light-emitting device
US7998597B2 (en) Organic light emitting device
JP4944557B2 (en) Organic light emitting device
JP4659695B2 (en) Fluorene compound and organic light emitting device
US7709832B2 (en) Organic compound and organic light-emitting element
US9051232B2 (en) Perylene compound and organic light emitting device using the compound
US8318321B2 (en) Compound and organic light-emitting device
JP2004002298A (en) Oligofluorenylene compound
JP2003138251A (en) Organic luminescent device
US20070257603A1 (en) Fluorene compound and organic light-emitting device using the compound
JP2004107326A (en) Condensed polycyclic compound and organic light-emitting element by using the same
US7622201B2 (en) Pyrene compound and organic light emitting device
US7794854B2 (en) Corannulene compound and organic light-emitting device
US8318326B2 (en) Fused polycyclic compounds and organic light-emitting device using the same
JP4035499B2 (en) Organic light emitting device
US8431249B2 (en) Dibenzo[C,G]fluorene compound and organic light-emitting device using same
JP2000306670A (en) Organic luminescent element

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION