Classifications

• • 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
  • H10K85/636—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
  • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
  • C07D487/06—Peri-condensed systems
• • 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
• • 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]
  • H10K50/14—Carrier transporting layers
  • H10K50/15—Hole transporting layers

Definitions

• the present invention relates to an
• aminoindolo [ 3 , 2 , 1-j k] carbazole compound and an organic light-emitting device including the compound.
• An organic light-emitting device includes an anode, a cathode, and an organic compound layer disposed between the electrodes.
• holes and electrons injected from the electrodes are recombined in the organic compound layer to generate excitons, and the excitons emit light when they return to their ground state.
• PTL 1 discloses SH-01 represented by the following formula as an aromatic amine compound that can be used in, for example, a hole-transporting layer of an organic light- emitting device.
• PTL 2 describes FH-01 represented by the following formula as a compound for an organic light-emitting device.
• PTLs 1 and 2 describe compounds that can be used in organic light-emitting devices.
• the present invention provides a novel
• the present invention provides an aminoindolo [ 3 , 2 , 1-j k] carbazole compound represented by the following Formula [1] :
• 1 represents an integer of 1 to 3; n and m each independently represent an integer of 0 to 2; and R 1 to R 32 represent hydrogen atom, alkyl groups having 1 to 8 carbon atoms or fluorine atoms, wherein the alkyl groups may contain fluorine atoms.
• the present invention can provide a novel
• aminoindolo [ 3 , 2 , 1- k] carbazole compound having high heat stability and an organic light-emitting device having a low driving voltage and high driving durability by using the compound .
• Figure 1 is a schematic cross-sectional view illustrating organic light-emitting devices and switching devices connected to the organic light-emitting devices. Description of Embodiment
• the present invention relates to an
• 1 represents an integer of 1 to 3; n and m each independently represent an integer of 0 to 2 ; and R 1 to R 32 represent hydrogen atom, alkyl groups having 1 to 8 carbon atoms or fluorine atoms, wherein the alkyl groups may contain fluorine atoms.
• R 1 to R 32 can be hydrogen atom, alkyl groups having 1 to 6 carbon atoms or fluorine atoms.
• the alkyl group may contain a fluorine atom, i.e., may be methyl fluoride or tetrafluoromethane .
• the compound according to the present invention is composed of three moieties: an aromatic amino group, an aromatic group, and an indolo [ 3 , 2 , 1-j k] carbazolyl group.
• the presence of the aromatic amino group and the aromatic group allows the compound to have a HOMO level suitable for a hole-injecting layer, a hole-transporting layer, or an electron-blocking layer.
• the aminoindolo [ 3 , 2 , 1-j k] carbazole compound according to the present invention includes an indolo [ 3 , 2 , 1- j k] carbazolyl group having higher heat stability compared with that of a carbazolyl group, which is generally used in a hole-injecting layer, a hole-transporting layer, an electron-blocking layer, or another layer. Consequently, the aminoindolo [ 3 , 2 , 1-j k] carbazole compound exhibits high heat stability.
• aminoindolo [3, 2, 1-j k] carbazole compound according to the present invention increases by having an alkyl group. [0024] Consequently, the aminoindolo [ 3 , 2 , 1-j k] carbazole compound having an alkyl group can easily form a film by coating .
• aminoindolo [ 3 , 2 , 1- k] carbazole compound according to the present invention can be at least one of R 18 to R 20 and R 27 to R 29 .
• aminoindolo [ 3 , 2 , 1-j k] carbazole compound having a substituent containing fluorine can easily form a film by deposition.
• aminoindolo [ 3 , 2 , 1-j k] carbazole compound of the present invention has high heat stability and can be applied to film formation by any of coating and deposition.
• it can be expected that an organic light-emitting device
• the compounds belonging to group A do not contain alkyl groups and fluorine atoms.
• these compounds in group A have hi chemical stability, and an organic light-emitting device including such a compound as a hole-injecting, a hole- transporting, or an electron-blocking material can be expected to have a long lifetime.
• the compounds belonging to group B contain alkyl groups and thereby have high solubility and can easily form films by coating.
• These compounds have shallow HOMO levels, and an organic light-emitting device including such a compound can be expected to be driven by a lower voltage.
• the shallow HOMO level means that the HOMO level is near the vacuum energy level.
• the compounds belonging to group C contain fluorine atoms, and, thereby, the intermolecular interaction between the compounds is low. As a result, the compounds have high sublimability and can further easily form films by deposition.
• a desired aminoindolo [ 3 , 2 , 1- jk] carbazole compound of the present invention can be synthesized by appropriately selecting n, m, and 1 and the alkyl group and the fluorine atom.
• the organic light-emitting device includes at least a pair of electrodes facing each other, i.e., an anode and a cathode, and an organic compound layer disposed therebetween.
• the organic compound layer includes the
• the organic compound layer of the organic light- emitting device may be a monolayer or a multilayer.
• the multilayer includes those appropriately selected from, for example, a hole-injecting layer, a hole-transporting layer, an electron-blocking layer, a light-emitting layer, a hole-blocking layer, an electron- transporting layer, an electron-injecting layer, and an exciton-diffusion-blocking layer .
• the organic light-emitting device includes a pair of
• electrodes a hole-injecting layer, a hole-transporting layer, a light-emitting layer, an electron-transporting layer, and an electron-injecting layer.
• the organic light-emitting device may have a
• devices may emit different colors of light.
• the light-emitting device having a plurality of light-emitting layers may include the light-emitting layers between a pair of electrodes. For example, in one
• light-emitting layers respectively emitting red, green, and blue light are layered between the anode and the cathode.
• the configuration of the organic light-emitting device according to the present embodiment is not limited thereto, and various layer configurations can be employed.
• an insulating layer may be disposed at the interface between an electrode and an organic compound layer; an adhesive layer or an interference layer may be provided; or an electron-transporting layer or a hole- transporting layer may be composed of two layers having ionization potentials different from each other.
• the configuration of the device may be a top emission type extracting light from the opposite side of the substrate, or a bottom emission type extracting light from the substrate side.
• a configuration in which light is extracted from both sides can also be employed.
• the aminoindolo [ 3 , 2 , 1-j k] carbazole compound according to the present invention can be used in any layer as an organic compound layer of the organic light-emitting device and can be used, in particular, in the hole-injecting layer, the hole-transporting layer, or the electron-blocking layer .
• the hole-injecting layer, the hole-transporting layer, and the electron- blocking layer are organic compound layers disposed between the anode and the light-emitting layer.
• the hole-transporting layer is a layer for
• the material used for the hole-transporting layer can be a material having the HOMO level at an
• aminoindolo [ 3 , 2 , 1-j k] carbazole compound according to the present invention is an appropriate compound satisfying this requirement.
• aminoindolo [ 3 , 2 , 1-j k] carbazole compound according to the present invention can be used in the hole-transporting layer.
• a known low-molecular or high-molecular compound may be optionally used. More specifically, for example, a hole-injecting compound, a hole-transporting compound, a host material, a light-emitting compound, an electron- injecting compound, or an electron-transporting compound can be used together. Examples of these compounds will now be described.
• the hole-injecting/transporting compound can be a material possessing high hole mobility so that injection of holes from an anode is easy and that the injected holes can be transported to an light-emitting layer.
• Examples of the low-molecular or high-molecular material having hole- injecting/transporting ability include triarylamine
• Examples of the light-emitting material mainly related to the emission function include, in addition to phosphorescent guest materials and derivatives thereof, condensation compounds (e.g., fluorene derivatives,
• naphthalene derivatives naphthalene derivatives, pyrene derivatives, perylene
• the electron-injecting/transporting compound can be appropriately selected from those that allows easy injection of electrons from a cathode and can transport the injected electrons to a light-emitting layer, with consideration for, for example, the balance with the hole mobility of the hole- injecting/transporting compound.
• oxadiazole derivatives include oxadiazole derivatives, oxazole derivatives,
• the material of the anode can have a work function as high as possible.
• Examples of such a material include simple metals such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium, and tungsten; alloys of these simple metals; and metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide. Electrically conductive polymers such as polyaniline, polypyrrole, and polythiophene also can be used.
• Electrode materials may be used alone or in combination of two or more thereof.
• the anode may have either a monolayer structure or a multilayer structure.
• the material of the cathode can have a low work function.
• examples of such a material include alkali metals such as lithium; alkaline earth metals such as calcium;
• simple metals such as aluminum, titanium, manganese, silver, lead, and chromium; alloys of these simple metals such as magnesium-silver, aluminum-lithium, and aluminum-magnesium; and metal oxides such as indium tin oxide (ITO).
• ITO indium tin oxide
• the cathode may have either a monolayer structure or a multilayer structure.
• solvent e.g., spin coating, dipping, casting, an LB method, or an ink jet method.
• a layer formed by vacuum deposition or coating of a solution hardly causes, for example, crystallization and is stable for a long time.
• the solution may additionally contain an
• binder resin examples include, but not limited to, polyvinylcarbazole resins, polycarbonate resins, polyester resins, ABS resins, acrylic resins, polyimide resins, phenol resins, epoxy resins, silicone resins, and urea resins.
• binder resins may be singly used as a
• the solution for forming a film may further
• additives such as known plasticizer, antioxidant, and ultraviolet absorber.
• the organic light-emitting device according to the present embodiment can be applied to a display apparatus or a lighting system.
• the device can be used, for example, in an exposing light source of an
• the display apparatus has the organic light- emitting device according to the present embodiment in a display section.
• the display section has a plurality of pixels.
• Each pixel has the organic light-emitting device according to the present embodiment and a thin-film
• TFT transistor
• transistor is connected to the anode or the cathode of the organic light-emitting device.
• the display apparatus can be used as an image display apparatus of, for example, a PC, a head mount display, or a mobile phone.
• the image displayed may be a two-dimensional image or a three-dimensional image.
• the display apparatus may be an image output apparatus that includes an image input section for inputting image information from, for example, an area CCD, a linear CCD, or a memory card and outputs the input image to a display section.
• the image output apparatus may be a digital camera having an image pickup optical system with an image pickup device, such as a CCD sensor, as the image input section.
• an image pickup device such as a CCD sensor
• the display apparatus may have an input function for inputting information by touching an image on the display, such as a touch panel function.
• the display apparatus may be used in the display section of a multi-functional printer.
• the organic light-emitting device according to the present embodiment may be used in a lighting system.
• This lighting system includes the organic light-emitting device according to the present embodiment and a converter circuit connected to the organic light-emitting device.
• the color of illumination light of the lighting system according to the present embodiment may be white or neutral white or another color.
• Figure 1 is a schematic cross-sectional view illustrating organic light-emitting devices according to the present embodiment and TFTs as an example of switching devices connected to the organic light-emitting devices. This drawing shows two pairs of the organic light-emitting devices and the TFTs. The structure will now be described in detail.
• the display apparatus shown in Figure 1 includes a substrate 1 such as a glass substrate and a moisture-proof film 2 disposed on the substrate 1 for protecting TFTs or an organic compound layer.
• Reference numeral 3 denotes a metal gate electrode
• reference numeral 4 denotes a gate
• reference numeral 5 denotes a
• a thin-film transistor 8 includes a semiconductor layer 5, a drain electrode 6, and a source electrode 7.
• An insulating film 9 is disposed on the thin-film transistor 8.
• the source electrode 7 is connected to the anode 11 of the organic light-emitting device via a contact hole 10.
• the display apparatus is not limited to this structure as long as either the anode or the cathode is connected to either the source electrode or the drain electrode of the thin-film transistor.
• the organic compound layer 12 is simplified and drawn as one layer, but is actually composed of a plurality of organic compound layers.
• protection layer 14 and a second protection layer 15 are disposed on a cathode 13 for inhibiting degradation of the organic light-emitting device.
• the switching device is not particularly limited and may be a transistor or an MIM element.
• the transistor may be a thin-film transistor employing single crystal silicon or an amorphous silicon transistor.
• the thin-film transistor is also called a TFT.
• the switching device controls the luminance.
• images can be displayed with the respective luminance.
• the luminance also can be controlled by producing an active matrix driver on a Si substrate and disposing the organic light-emitting devices thereon.
• the organic light-emitting devices can be disposed on a Si substrate.
• dehydrated toluene 550 mL were charged in a round bottom flask under light shielding.
• Example Compound A-112 with high purity (yield: -15%).
• Tg glass transition temperature
• Example Compound A- 022 with high purity.
• Tg glass transition temperature
• Tg glass transition temperature
• Tg glass transition temperatures
• each of comparative compounds SH-01 and SH-02 is increased by 16 to 20°C by replacing the carbazolyl group with an indolo [ 3 , 2 , 1-j k] carbazolyl group. It is thus recognized that the heat stability of the Example compounds is higher than that of the comparative compounds.
• a bottom emission type organic light-emitting device having a configuration composed of anode/hole-transporting layer/light-emitting layer/hole- blocking layer/electron-transporting layer/electron- injecting layer/cathode disposed in this order on a
• ITO indium tin oxide
• the glass substrate provided with the ITO film was subjected to ultrasonic washing in acetone and isopropyl alcohol (IPA) in this order, washed by boiling in IPA, and then dried. Furthermore, the substrate was subjected to UV/ozone washing.
• the thus-treated glass substrate was used as a transparent electrically conductive support substrate (ITO substrate).
• organic compound layers and electrode layers shown below were successively formed by resistance heating vacuum vapor deposition in a vacuum chamber. The layers were:
• a voltage was applied between a positive ITO electrode and a negative Al electrode of the resulting organic light-emitting device. As a result, a blue light emission was observed.
• characteristics of the organic light-emitting device the current-voltage characteristics were measured with an ammeter 2700 manufactured by Keithley Instruments, Inc., and the
• H-l, D-l, HBM-1 , and ET -1 used in Example 4 were synthesized with reference to U.S. Patent Publication No. 2005/0236977, Japanese Patent Laid-Open No. 2010-270103, International Publication No. WO2010/107037 , and
• An organic light-emitting device was produced as in Example 4 except that the hole-transporting layer was formed using A-022 instead of A-112. A voltage was applied between a positive ITO electrode and a negative Al electrode of the resulting organic light-emitting device. As a result, a blue light emission was observed.
• An organic light-emitting device was produced as in Example 4 except that the hole-transporting layer was formed using A-113 instead of A-112. A voltage was applied between a positive ITO electrode and a negative Al electrode of the resulting organic light-emitting device. As a result, a blue light emission was observed.
• An organic light-emitting device was produced as in Example 4 except that the hole-transporting layer was formed using SH-01 instead of A-112. A voltage was applied between a positive ITO electrode and a negative Al electrode of the resulting organic light-emitting device. As a result, a blue light emission was observed.
• Table 2 shows the relative voltage at 6000 cd/m 2 (when the voltage in the organic light-emitting device of Comparative Example 2 was defined as 1) and the relative time for reducing brightness by 4% in driving at a constant current of 25 mA/m 2 (when the time in the organic light-emitting device of Comparative Example 2 was defined as 1) .
• Example compounds allowed a reduction in driving voltage and an increase in endurance time of driving compared with those by the comparative compound.
• the aminoindolo [ 3 , 2 , 1- j k] carbazole compound according to the present invention has satisfactory heat stability, and a light-emitting device in which the compound is used can have a low driving voltage and high driving durability.

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• Nitrogen Condensed Heterocyclic Rings (AREA)
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