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  • H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
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  • Y10S428/917—Electroluminescent

Definitions

• the present invention relates to a novel styryl compound and an organic electroluminescent device, and more particularly to an organic electroluminescent device having high heat resistance, high luminous efficiency, long life and high blue purity, and a novel styryl compound realizing the same. .
• Rice field
• Organic electroluminescent (EL) elements using organic materials are being actively used in light sources such as flat panel light sources for wall-mounted televisions and backlights for displays.
• light sources such as flat panel light sources for wall-mounted televisions and backlights for displays.
• EL Organic electroluminescent
• EP 0 610 514 discloses a stilbene compound and a device using the same.
• the device disclosed here emits blue light with high luminous efficiency, it has low color purity, short life, and is not practical.
• the chromaticity coordinate is about (0.16, 0.19)
• the chromaticity y coordinate is smaller than 0.18
• the half-life was required to be 10,000 hours or more.
• the present invention has been made to solve the above problems, and provides an organic electroluminescent device having high heat resistance, high luminous efficiency, long life, and high blue purity, and a novel styryl compound for realizing the same.
• the purpose is to do so.
• organic electroluminescent element having the preferable properties described above.
• organic EL devices organic electroluminescent devices
• the addition of a novel styryl compound having a specific structure to the organic compound film improves the heat resistance and life of the organic elect-opening luminescence device.
• the inventors have found that the hole transporting property and the electron transporting property are improved, the luminous efficiency is increased, and the blue purity is increased, leading to the completion of the present invention. That is, the present invention is represented by the following general formula (1).
• R 1 to R ′ each independently represent a hydrogen atom, a substituted or unsubstituted carbon atom! To 30 alkyl group, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.
• A, B, C and D each independently represent a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 40 carbon atoms, and A , B, C or D is at least one Ar 1 -A r 2 , A r 'is a substituted or unsubstituted phenylene or naphthalene group, and A r 2 is a substituted or unsubstituted Is an aryl group having 6 to 34 carbon atoms.
• a and C are biphenyl groups and B and D are phenyl groups.
• a novel styryl compound c represented by the following general formula (2)
• a ′, B ′, C, and D ′ are each independently a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 40 carbon atoms. And A ′ and C ′ are a substituted or unsubstituted 2- to 5-ring fused hydrocarbon group.
• the present invention provides an organic EL device having an organic compound film composed of a single layer or a plurality of layers having at least a light-emitting layer between a pair of electrodes, wherein at least one of the organic compound films contains the novel styryl compound.
• organic EL devices that contain them.
• FIG. 1 is a 1 H NMR chart of the novel styryl compound (1) of the present invention.
• FIG. 2 is a 1 H NMR chart of the novel styryl compound (2) of the present invention.
• FIG. 3 is a 1 H NMR chart of the novel styryl compound (3) of the present invention.
• FIG. 4 is a 1 H NMR chart of the novel styryl compound (4) of the present invention.
• FIG. 5 is a 1 H NMR chart of the novel styryl compound (5) of the present invention.
• R 1 to: l fl each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted carbon atom number 1 to 30 alkoxy groups, substituted or unsubstituted aryl groups having 6 to 20 carbon atoms, substituted or unsubstituted aryloxy groups having 6 to 18 carbon atoms, substituted or unsubstituted carbon atoms Condensed polycyclic group having 6 to 30 carbon atoms, substituted or unsubstituted heterocyclic group having 5 to 30 carbon atoms, amino group, alkylamino group having 2 to 30 carbon atoms, 6 to 30 carbon atoms Represents an arylamino group, a cyano group, a nitro group, a hydroxyl group or a halogen
• A, B, C and D each independently represent a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted carbon atom 6 a to 4 0 Ariru group, and a, B, at least 2 in the C or D one a r 1 - is a r 2, a r 1 represents a substituted or unsubstituted Fuweniren group or a naphthalene group And Ar 2 is a substituted or unsubstituted aryl group having 6 to 34 carbon atoms.
• a and C are biphenyl groups, and B and D are phenyl groups.
• a ′, B,, C and D ′ each independently represent a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkyl group having 6 to 20 carbon atoms.
• ⁇ 40 aryl groups, and A 'and C' are substituted or unsubstituted 2 to 5 ring fused hydrocarbon groups.
• the organic EL device of the present invention is an organic EL device having at least a single layer or a plurality of organic compound films having a light emitting layer between a pair of electrodes, wherein at least one of the organic compound films is the novel styryl. Contains compounds.
• the light emitting layer contains the novel styryl compound. It is also preferable that the electron injection layer or the hole injection layer contains the novel styryl compound.
• An inorganic compound layer may be provided between the light emitting layer and the electrode.
• the novel styryl compound When the novel styryl compound is contained in at least one layer of the organic compound film, the heat resistance, luminous efficiency, lifetime, and blue purity of the organic EL element are improved because the styryl compound has high fluorescence and This is because the vector has a peak at a short wavelength. Further, since the novel styryl compound has eight or more, and in some cases, ten or more hydrocarbon rings and a high molecular weight, the film containing the novel styryl compound is less susceptible to thermal change. is there.
• examples of the aryl group include groups such as phenylene, naphthyl, anthryl, acenaphthur, fluorenyl, pentanthryl, indenyl, pyrenyl, and fluoranthur.
• the organic EL device of the present invention is a device in which a single-layer or multilayer organic compound film is formed between an anode and a cathode.
• a light emitting layer is provided between an anode and a cathode.
• the light-emitting layer contains a light-emitting material and, in addition, a hole-injection material or an electron-injection material for transporting holes injected from the anode or electrons injected from the cathode to the light-emitting material. good.
• the light emitting material has extremely high fluorescence quantum efficiency, high hole transport ability and electron transport ability, and forms a uniform thin film.
• the multi-layer organic EL devices include (anode / hole injection layer / emission layer Z cathode), (anode / emission layer / electron injection layer / cathode), (anode / hole injection layer / emission layer Z electron injection layer / (Cathode).
• the novel styryl compound of the present invention in addition to the novel styryl compound of the present invention, further known light emitting materials, doping materials, hole injection materials, and electron injection materials can be used.
• the preferred use of the novel styryl compound is as a doping material, wherein the concentration is 0.1 to 20% by weight in any of the light emitting layer, the electron injection layer, the hole transport layer and the hole injection layer. Add in. More preferably, Mel at a concentration 1-1 0 weight 0/0.
• the organic EL element having a multilayer structure can prevent a reduction in luminance and life due to quenching. If necessary, a combination of luminescent materials, other doping materials, hole injection materials and electron injection materials can be used. Further, by using other driving materials, it is possible to improve the light emission luminance and the light emission efficiency and obtain red or white light emission. Further, each of the hole injection layer, the light emitting layer, and the electron injection layer may be formed by two or more layers. At that time, in the case of the hole injection layer, holes are injected from the electrode.
• the layer that enters the hole injection layer is called a hole injection layer
• the layer that receives holes from the hole injection layer and transports holes to the light emitting layer is called a hole transport layer.
• an electron injection layer a layer that injects electrons from the electrode is called an electron injection layer, and a layer that receives electrons from the electron injection layer and transports electrons to the light emitting layer is called an electron transport layer.
• an electron injection layer a layer that injects electrons from the electrode
• an electron transport layer a layer that receives electrons from the electron injection layer and transports electrons to the light emitting layer.
• Each of these layers is selected and used depending on factors such as the energy level of the material, heat resistance, and adhesion to the organic compound film or the metal electrode.
• the light emitting material or the host material that can be used in the organic compound film together with the novel styryl compound includes condensed polycyclic aromatics, such as anthracene, naphthalene, phenanthrene, pyrene, tetracene, pentacene, coronene, chrysene, fluorescein, and perylene. , Rubrene and their derivatives.
• perylene lid naph evening perylene, perinone, perinone, naph evening perinone, diphenylbutadiene, tetraphenylbutadiene, coumarin, oxaziazole, aldazine, bisbenzoxazoline, bisstyryl, pyrazine, cyclopentene Genes, quinoline metal complexes, aminoquinoline metal complexes, benzoquinoline metal complexes, imines, diphenylethylene, vinylanthracene, diaminocarbazole, pyran, tiopyran, polymethine, merocyanine, imidazole chelated oxynide compounds, quinatari Don, rubrene, stilbene, and derivatives thereof, and the like, but are not limited thereto.
• a hole injecting material As a hole injecting material, it has the ability to transport holes, has a hole injecting effect from the anode, has an excellent hole injecting effect on the light emitting layer or the light emitting material, and has a function of excitons generated in the light emitting layer.
• a compound that prevents migration to an electron injection layer or an electron injection material and has excellent thin film forming ability is preferable.
• phthalocyanine derivatives naphthalocyanine derivatives, porphyrin derivatives, oxazoles, oxazines, triazoles, imidazoles, imidazolones, imidazolethiones, pyrazolines, pyrazones, tetrahydroimidazoles, oxazols, Oxadiazol, hydrazone, acylhydrazone, polyarylalkane, stilbene, butadiene, benzidine-type triphenylamine, styrylamine-type triphenylamine, diamine-type Examples include, but are not limited to, triflnilamine and the like, derivatives thereof, and polymer materials such as polyvinyl carbazole, polysilane, and conductive polymers.
• a more effective hole injection material is an aromatic tertiary amine derivative or a phthalocyanine derivative.
• aromatic tertiary amine derivatives include triphenylamine, tritolylamine, tolyldiphenylamine, N, N, diphenyl-1-N, N, 1- (3-methylphenyl) 1-1,1,1-biphenyl-1.
• phthalocyanine (Fc) derivative H 2 Pc ;, CuPc, CoPc , N i Pc, ZnPc ;, PdPc, FePc, MnPc, C lAI Pc, C 1 G a Pc, C l I nPc, C l SnPc , C l 2 S i Pc, is a (HO) Al Pc, (H ⁇ ) GaPc, VOFc, T i OPc , Mo OP c.
• an electron injection material it has the ability to transport electrons, has the effect of injecting electrons from the cathode, has an excellent electron injection effect on the light emitting layer or the light emitting material, and has a hole injection layer for excitons generated in the light emitting layer Compounds that prevent migration to the surface and have excellent thin film forming ability are preferred.
• the charge injecting property can be improved by adding an electron accepting substance to the hole injecting material and an electron donating substance to the electron injecting material.
• a more effective electron injection material is a metal complex compound or a nitrogen-containing five-membered ring derivative.
• the metal complex compound examples include lithium 8-hydroxyquinolinate, bis (8-hydroxyquinolinate) sub-dust, bis (8-hydroxyquinolinate) copper, and bis (8-hydroxyquinolinate) ) Manganese, tris (8-hydroxyquinolinato) aluminum, tris (2-methyl-18-hydroxyquinolinato) aluminum, tris (8-hydroxyquinolinato) gallium, bis (10-hydroxybenzoyl) [h] quinolinato) beryllium, bis (10-hydroxybenzo)
• an oxazole, thiazole, oxaziazole, thiadiazole or triazole derivative is preferable.
• an inorganic compound layer may be provided between the light emitting layer and the electrode to improve the charge injection property.
• examples of such an inorganic compound layer include alkali metal compounds (such as fluorides and oxides) and alkaline earth metal compounds. Specifically, L i F, L i 20, B a ⁇ , and S r O, B aF 2, such as S r F 2 and the like.
• a material having a work function greater than 4 eV is suitable, and carbon, aluminum, vanadium, iron, cobalt, nickel, tungsten, silver, gold, platinum, and palladium Metal oxides such as tin oxide and indium oxide used for ITO substrates and NESA substrates, and organic conductive resins such as polythiophene-polypyrrole are used.
• the conductive material used for the cathode those having a work function of less than 4 eV are suitable, such as magnesium, calcium, tin, lead, titanium, yttrium, lithium, ruthenium, manganese, aluminum, and the like.
• the alloys are used, but are not limited to these. Typical examples of the alloy include magnesium / silver, magnesium Z indium, and lithium / aluminum, but are not limited thereto.
• the ratio of the alloy is controlled by the temperature, atmosphere, degree of vacuum, and the like of the evaporation source, and is selected to be an appropriate ratio.
• the anode and the cathode may be formed of two or more layers if necessary.
• it is desirable that at least one surface is sufficiently transparent in an emission wavelength region of the device in order to efficiently emit light. It is also desirable that the substrate is transparent.
• the transparent electrode is set so as to secure a predetermined translucency by a method such as vapor deposition or sputtering using the above conductive material.
• the electrode on the light emitting surface desirably has a light transmittance of 10% or more.
• the substrate is not limited as long as it has mechanical and thermal strength and transparency, and examples thereof include a glass substrate and a transparent resin film.
• the transparent resin film include polyethylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polypropylene mouth, polystyrene, polystyrene, polymethyl methacrylate, polyvinyl chloride, polyvinyl alcohol, and polyvinyl butyral.
• Nylon polyetheretherketone, polysulfone, polyethersulfone, tetrafluoroethylene-perfluoroalkylbutylether copolymer, polyvinylfluoride, tetrafluoroethylene-ethylene copolymer, tetrafluoride Polyethylene-hexafluoropropylene copolymer, polychlorinated trifluoroethylene, polyvinylidene fluoride, polyester, polycarbonate, polyurethane, polyimide, polyester terimid, polyimid , And polypropylene.
• a protective layer can be provided on the surface of the device, or the entire device can be protected with silicon oil, resin, or the like, in order to improve stability against temperature, humidity, atmosphere, and the like.
• Each layer of the organic EL element can be formed by any of dry film forming methods such as vacuum deposition, sputtering, plasma, and ion plating, and wet film forming methods such as spin coating, dipping, and flow coating. it can.
• the film thickness is not particularly limited, but needs to be set to an appropriate film thickness. If the film thickness is too large, a large applied voltage is required to obtain a constant light output, resulting in poor efficiency. If the film thickness is too thin, a pinhole or the like is generated, and sufficient light emission luminance cannot be obtained even when an electric field is applied.
• a normal film thickness in the range of 5 nm to 10 wm is suitable, More preferably, the range is 0.2 um.
• a material for forming each layer is dissolved or dispersed in an appropriate solvent such as ethanol, chloroform, tetrahydrofuran, dioxane or the like to form a thin film, but any solvent may be used.
• an appropriate resin or additive may be used for improving film forming properties and preventing pinholes in the film.
• Resins that can be used include insulating resins such as polystyrene, polycarbonate, polyarylate, polyester, polyamide, polyurethane, polysulfone, polymethyl methacrylate, polymethyl acrylate, cellulose, and their copolymers, and poly (N).
• Photoconductive resins such as bullazole and polysilane, and conductive resins such as polythiophene and polypyrrolyl.
• the additives include an antioxidant, an ultraviolet absorber, and a plasticizer.
• the organic EL device of the present invention can be used, for example, as a flat light-emitting body such as a flat panel display of a wall-mounted television, a light source such as a copying machine, a printer, a backlight or an instrument of a liquid crystal display, a display board, a sign lamp, and the like.
• a flat light-emitting body such as a flat panel display of a wall-mounted television
• a light source such as a copying machine, a printer, a backlight or an instrument of a liquid crystal display
• a display board such as a sign lamp, and the like.
• Compound (1) was synthesized by the following reaction route.
• Diaminostilbene dihydrogen chloride 2.8 g (10 mmol), 4-bromobiphenyl 10.3 g (44 mmol), tris (dibenzylideneacetone) dipalladium 0.14 g (1.5 m0 1%), tri_t—butyl phosphine 0.06 g (3 m 0 1%), t—butoxy sodium 4.2 g (44 mm 01), dry toluene 100 milliliters, and then The mixture was heated and stirred overnight at 10 ° C.
• Compound (2) was synthesized by the following reaction route.
• FIG. 2 shows an NMR chart of the compound (2).
• FIG. 4 shows an NMR chart of the compound (4).
• FIG. 5 shows an NMR chart of compound (5).
• a 1 mm thick glass substrate with an ITO transparent electrode (manufactured by Geoma Tech) was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then UV ozone cleaning for 30 minutes.
• the glass substrate with the transparent electrode lines after cleaning is mounted on a substrate holder of a vacuum evaporation apparatus.
• a 60 nm-thick film is formed on the surface where the transparent electrode lines are formed so as to cover the transparent electrodes.
• TPD232 film ⁇ '—bis ( ⁇ , N' diphenyl-2-aminophenyl) 1 N, N '—diphenyl4,4, -diamino 1,1' —biphenyl film (hereinafter referred to as TPD232 film) did.
• This TPD 232 film functions as a first hole injection layer (hole transport layer).
• a 2,4,1-bis [N— (1-naphthyl) -1N-phenylamino] biphenyl film hereinafter, referred to as an NPD film having a thickness of 2 O nm was formed on the PD2332 film.
• This NFD film functions as a second hole injection layer (hole transport layer).
• composition ratio of 4,, 4 ', monobis (2,2-diphenylvinyl) -19,10-biphenyl (hereinafter referred to as DPVBI) and the above compound (1) in O nm is as follows. 1. controlled to be 5 wt 0/0 was deposited binary vapor deposited. This DPVBI: compound (1) film functions as a light emitting layer. A 20 nm-thick tris (8-quinolinol) aluminum film (hereinafter, A1q film) was formed on this film. This A1q film functions as an electron injection layer. Thereafter, Li (Li source: manufactured by SAES Getter Co., Ltd.) and Alq were binary deposited to form an A1q: Li film as an electron injection layer (cathode). This A 1 q
• Metal A1 was vapor-deposited on the Li film to form a metal cathode to produce an organic EL device. This device emitted blue light of high purity at 27 V cd / m 2 , luminous efficiency of 4.5 cd / A, and chromaticity (0.15, 0.16) at a DC voltage of 6 V. .
• a life test was performed by driving at a constant current with an initial luminance of 100 cd / m 2 , the half-life was as long as 12000 hours.
• a 1 mm thick glass substrate with an IT0 transparent electrode (manufactured by Dioma Tech) was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then to UV ozone cleaning for 30 minutes.
• the glass substrate with the transparent electrode lines after cleaning is mounted on a substrate holder of a vacuum evaporation apparatus.
• a 6-nm-thick film is formed so as to cover the transparent electrodes.
• a TFD232 film was formed. This TPD232 film functions as a first hole injection layer (hole transport layer).
• an NPD film having a thickness of 20 nm was formed on the TPD232 film.
• This NPD film functions as a second hole injection layer (hole transport layer). Further, 4,4,4, '-bis (2,2-diphenylvinyl) -19,10-biphenylanthracene (hereinafter referred to as DFVDPAN) and the above compound (2) were deposited on the NPD film at a thickness of 40 nm. The film was formed by dual vapor deposition while controlling the composition ratio of the compound (2) to 2.5% by weight.
• This DP VD PAN compound (2) film functions as a light emitting layer. An Alq film having a thickness of 20 nm was formed on this film. This Alq film functions as an electron injection layer.
• Li Li source: manufactured by Saes Getter Co.
• A1q Li film as an electron injection layer (cathode).
• Metallic A1 was vapor-deposited on this A1q: Li film to form a metal cathode, thereby producing an organic EL device.
• This device emitted blue light of high purity with a luminance of 34.3 cd / m 2 , luminous efficiency of 4.1 cd / A, chromaticity (0.15, 0.16) at a DC voltage of 6 V. .
• the spectrum of this device has a peak at about 450 nm, which is useful as a blue light emitting device. Further, when a life test was performed with an initial luminance of 100 cd / m 2 and a constant current drive, the half life was 9800 hours, which was extremely long.
• An organic EL device was fabricated in the same manner as in Example 2 except that the compound (2) was changed to the compound (3).
• This device emitted blue light of high purity at a luminance of 103 cd / m 2 , luminous efficiency of 4.4 cd / A, chromaticity (0.15, 0.18) at 6 V DC. .
• the spectrum of this device has a peak at about 46 O nm, and is useful as a blue light emitting device. Further, when a life test was performed by driving at a constant current with an initial luminance of 100 cd / m 2 , the half-life was extremely long, that is, 16000 hours.
• An organic EL device was fabricated in the same manner as in Example 2, except that the compound (2) was changed to the compound (4).
• the device At a DC voltage of 6 V, the device emitted blue light with high luminance of 62 cd / m 2 , luminous efficiency of 4.5 cd / A, chromaticity (0.15, 0.19) and high purity.
• the spectrum of this element has a peak at about 460 nm, and is useful as a blue light emitting element. Further, when a life test was performed by driving at a constant current with an initial luminance of 100 cd / m 2 , the half life was extremely long, ie, 1800 hours.
• Example 1 the compound (1) was replaced with the following compound
• An organic EL device was produced in the same manner except that the above was changed to.
• This device emitted blue light with low luminous efficiency of 3 cd / A at a DC voltage of 6 V. Also driven with a constant current to the life test with the initial luminance 1 0 0 cd / m 2 However, the half life was as short as 2000 hours.
• Example 1 the above compound (1) was replaced with the following compound
• An organic EL device was fabricated in the same manner except that the above was changed to.
• This device emitted blue light with low efficiency of 2.7 cd / A at a DC voltage of 6 V.
• a life test was performed by driving at a constant current with an initial luminance of 100 cd / m 2. As a result, the half life was shortened to 230 hours.
• the organic electroluminescence device using the novel styryl compound of the present invention has high heat resistance, high luminous efficiency, long life, and high blue purity.
• the organic electroluminescent element of the present invention is useful as a light source such as a plane light emitter of a wall-mounted television or a backlight of a display.

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• 2001
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