WO2012121101A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2012121101A1 WO2012121101A1 PCT/JP2012/055228 JP2012055228W WO2012121101A1 WO 2012121101 A1 WO2012121101 A1 WO 2012121101A1 JP 2012055228 W JP2012055228 W JP 2012055228W WO 2012121101 A1 WO2012121101 A1 WO 2012121101A1
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Images
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- 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
- H10K50/12—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising dopants
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/56—Ring systems containing three or more rings
- C07D209/80—[b, c]- or [b, d]-condensed
- C07D209/82—Carbazoles; Hydrogenated carbazoles
- C07D209/86—Carbazoles; Hydrogenated carbazoles with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the ring system
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
- C07D405/10—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a carbon chain containing aromatic rings
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- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/14—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing three or more hetero rings
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
- C07D409/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing three or more hetero rings
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- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
- C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
- C07D471/04—Ortho-condensed systems
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- 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
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- H—ELECTRICITY
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- 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
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
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- 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
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- H10K2101/90—Multiple hosts in the emissive layer
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- 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
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- 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
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
Definitions
- the present invention relates to an organic electroluminescence device having high luminous efficiency, improved long-term driving stability, and excellent high-temperature storage stability.
- organic electroluminescence elements using organic substances are promising for use as solid light-emitting inexpensive large-area full-color display elements and writing light source arrays. Active research and development is underway.
- the organic EL element is composed of an organic functional layer (single layer portion or multilayer portion) having a thickness of only about 0.1 ⁇ m containing an organic light emitting material between a pair of anode and cathode formed on a film. It is a thin film type all solid state device.
- the white light emitting panel for lighting is required to have high efficiency and long life, and in particular, in the long life, the performance is lower than that of fluorescent lamps and white LEDs. For this reason, various attempts have been made to increase the efficiency and life of organic EL elements.
- organic EL elements One thing that greatly affects the performance of organic EL elements is the morphology of the thin film.
- an organic EL thin film is preferably used.
- crystallization of the organic substance during heating is performed by heating and drying at a temperature lower than the glass transition temperature Tg by 10 ° C. or more in the inert gas atmosphere.
- a method for preventing this is disclosed (for example, see Patent Document 1).
- planar molecules By using planar molecules, the packing becomes dense and the interaction between ⁇ electrons is increased, thereby improving the electrical characteristics.
- this method generally cannot be used in a light emitting layer containing dopant molecules that are not planar.
- This method makes it easy to achieve a carrier balance that is difficult to match with one type of molecule. However, even with this method, it is difficult to pack molecules closely. Further, when viewed with a single carrier, there is a risk that the electrical transport characteristics may be lower than when one type of each host is used due to a change in the filling state.
- Non-Patent Document 2 it has been shown that the performance is improved when three types of hosts are used in the light emitting layer containing the non-light emitting organic materials PVK and OXD-7 (for example, see Non-Patent Document 2).
- an amorphous film has a problem in that the direction in which the molecules are oriented is different, so that the interaction between molecules is small and the electric characteristics are not good.
- a part is present as a microcrystal, when the part grows into a nucleus and the crystal grows in the film, the influence of the grain boundary becomes large, the carrier is scattered, and the electrical characteristics are deteriorated. There is a problem that the life is shortened.
- the microcrystalline film grows at a high temperature, there is a problem that the high temperature storage stability is not good.
- An object of the present invention is to provide an organic EL device having high power efficiency, excellent long-term driving stability, and high-temperature storage stability (suppression of voltage increase during high-temperature storage).
- the light-emitting layer contains at least one light-emitting dopant and at least three non-light-emitting organic materials represented by the following general formula (2), and has the highest molecular weight among the non-light-emitting organic materials.
- a large one is 1500 or less, and the minimum content of the non-light-emitting organic material is 1% by mass or more.
- X represents NR ′, O, S, PR ′, PR′R ′′ R ′′ ′, CR′R ′′, or SiR′R ′′.
- R ′, R ′′ and R ′′ ′ each represent a hydrogen atom or a substituent.
- Ar represents an aromatic hydrocarbon ring group or an aromatic heterocyclic group.
- n represents an integer of 0 to 8.
- X, Y and Z represent NR ′, O, S, PR ′, PR′R ′′ R ′′ ′′, CR′R ′′ or SiR′R ′′.
- R′R ′′ R ′′ ′′ each represents a hydrogen atom or a substituent.
- the benzene ring may have a substituent.
- 3. 5 The organic electroluminescence device as described in 1 or 2 above, wherein 5 or more kinds of non-light-emitting organic materials represented by the general formula (2) are contained.
- the difference between the largest molecular weight M (max) and the smallest molecular weight M (min) is less than 250. 5.
- R 1 represents a substituent.
- Z represents a nonmetallic atom group necessary for forming a 5- to 7-membered ring.
- n1 represents an integer of 0 to 5.
- B 1 to B 5 represent a carbon atom, a nitrogen atom, an oxygen atom or a sulfur atom, and at least one represents a nitrogen atom.
- M 1 represents a group 8-10 transition metal element in the periodic table.
- X 1 and X 2 represent a carbon atom, a nitrogen atom or an oxygen atom, and L 1 represents an atomic group which forms a bidentate ligand together with X 1 and X 2 .
- m1 represents an integer of 1, 2, or 3
- m2 represents 0, 1 or 2
- m1 + m2 is 2 or 3.
- an organic EL device having high luminous efficiency, long luminous lifetime and high temperature storage stability.
- Sectional drawing which shows schematic structure of an organic electroluminescent element.
- FIG. 1 is a cross-sectional view showing a schematic configuration of an organic electroluminescence element (organic EL element) of the present invention, and shows an example of a preferred embodiment.
- an organic electroluminescence element 100 (hereinafter also referred to as an organic EL element) has a flexible support substrate 1, and an anode 2 is formed on the flexible support substrate 1.
- the organic functional layer 20 is formed thereon, and then the cathode 8 is formed on the organic functional layer 20.
- the organic functional layer 20 refers to each layer constituting the organic electroluminescence 100 provided between the anode 2 and the cathode 8.
- the organic functional layer 20 includes, for example, a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, an electron transport layer 6, an electron injection layer 7, and in addition, a hole block layer, an electron block layer, and the like. May be included.
- the anode 2, the organic functional layer 20, and the cathode 8 on the flexible support substrate 1 are sealed with a flexible sealing member 10 through a sealing adhesive 9.
- these layer structures (refer FIG. 1) of the organic EL element 100 show the preferable specific example, and this invention is not limited to these.
- the organic EL device 100 of the present invention may have a layer structure (i) to (viii) as shown below.
- the light emitting layer according to the organic EL device of the present invention is a layer that emits light by recombination of electrons and holes injected from the electrode (cathode, anode), electron transport layer, and hole transport layer, and emits light. May be in the light emitting layer or at the interface between the light emitting layer and the adjacent layer.
- the total thickness of the light emitting layers according to the present invention is preferably in the range of 1 to 100 nm, and more preferably 50 nm or less because a lower driving voltage can be obtained.
- the sum total of the film thickness of the light emitting layer as used in this invention is a film thickness also including the said intermediate
- each light emitting layer it is preferable to adjust the film thickness of each light emitting layer to a range of 1 to 50 nm.
- the film thicknesses of the blue, green and red light emitting layers There is no particular limitation on the relationship between the film thicknesses of the blue, green and red light emitting layers.
- a light emitting material or a host compound which will be described later, is formed by forming a film by a known thinning method such as a vacuum deposition method, a spin coating method, a casting method, an LB method, an ink jet method, or the like. it can.
- a plurality of light emitting materials may be mixed in each light emitting layer, or a phosphorescent light emitting material and a fluorescent light emitting material may be mixed and used in the same light emitting layer.
- the light emitting layer according to the present invention contains a host compound and a light emitting material (also referred to as a light emitting dopant or a light emitting dopant compound) and emits light from the light emitting material.
- a light emitting material also referred to as a light emitting dopant or a light emitting dopant compound
- the host compound and the light emitting material will be described in detail later.
- the light emitting layer is a non-light-emitting organic material represented by at least one light-emitting dopant and at least three kinds of the above general formula (2).
- the at least three kinds of non-light-emitting organic materials the one having the largest molecular weight among the non-light-emitting organic materials is 1500 or less, and the non-light-emitting organic material It has been found that when the minimum content is 1% by mass or more, the effects described in the present invention (improvement of luminous efficiency of the device, extension of lifetime, and improvement of high-temperature storage stability) can be obtained.
- Non-light emitting organic material represented by the general formula (2) >> The non-light-emitting organic material represented by the general formula (2) according to the present invention will be described.
- the non-light-emitting organic material represented by the above general formula (2) according to the present invention may have carrier transport properties, but the present invention includes those that do not have carrier transport properties.
- the number of types of the non-luminescent organic material represented by the general formula (2) is three or more. However, it is preferable to include four or more types, and high luminous efficiency is obtained. More preferably, it is more preferably 10 or more types, and still more preferably 10 to 15 types.
- the organic EL element of the present invention may have a plurality of light emitting layers.
- the light emitting layer is represented by the above general formula (2). At least three kinds of luminescent organic materials are contained, and the largest molecular weight among the non-luminescent organic materials is 1500 or less, and the minimum content of the non-luminescent organic materials is 1% by mass or more. This is a feature of the present invention.
- non-light emitting layer organic material represented by the general formula (2) may be contained in the same light emitting layer, or the organic EL device of the present invention has a plurality of light emitting layers. Includes one non-light emitting organic material represented by two general formulas (2) and another light emitting layer represented by one general formula (2). It can also take the form of containing a material.
- the light emitting layer constituting the organic EL device of the present invention is a single layer or a plurality of layers
- the light emitting layer as a whole is a non-light emitting organic material represented by the general formula (2).
- the material should just be contained.
- the same light emitting layer contains at least three kinds of non-light emitting organic materials represented by the general formula (2) is preferable.
- non-light-emitting of the non-light-emitting organic material means that the number of photons emitted by the light-emitting dopant in visible light (within a range of 400 to 780 nm) when the organic EL element emits light. This indicates that the number of photons emitted by the material is 1% or less.
- the light emitting layer according to the present invention contains at least three kinds of non-light emitting organic materials represented by the general formula (2), thereby improving the electrical characteristics of the organic EL device of the present invention and extending the lifetime.
- the present inventors believe that the packing has been improved as described below.
- Non-Patent Document 1 it is effective to increase the intermolecular interaction (particularly ⁇ - ⁇ interaction) in order to improve the electrical characteristics of the amorphous film. In order to increase the interaction, it is important to increase the overlap of wave functions between molecules.
- the carrier moves more easily when the wave function overlap is larger.
- the packing density in the amorphous film can be increased.
- the intermolecular distance is shortened and the molecular difference is reduced. It is thought that the overlap of wave functions is increased by reducing the effect of directionality, and as a result, the electrical characteristics are improved.
- the organic EL device of the present invention has a longer lifetime due to improved efficiency, because the light emitting layer according to the present invention (may be a single light emitting layer or a plurality of light emitting layers). It is considered that by containing three or more kinds of non-light-emitting organic materials represented by the general formula (2), crystal growth is suppressed and high-temperature storage stability is improved.
- Non-Patent Document 2 Even in Non-Patent Document 2, the efficiency is improved by adding the third species, which is presumed to be an effect of exciton confinement due to the triplet energy of the third species being sufficiently larger than the triplet energy of the dopant. Is done.
- the effect obtained by the constitution of the present invention is that electrical characteristics are improved by increasing the packing density of the light-emitting layer.
- the effect is different from that of Non-Patent Document 2.
- the organic EL device of the present invention is characterized by good high temperature storage stability.
- Hn the non-light-emitting organic material represented by the above general formula (2)
- M Hn of Hn M It is preferable that n increases and decreases as H1 > M H2 > M H3 >.
- the non-luminescent organic material represented by the general formula (2) preferably has a structure that easily causes carrier movement through a ⁇ - ⁇ interaction, and at least three kinds of the general formula (2) It is preferable that the non-light-emitting organic material represented by the formula (1) has the same aromatic skeleton (specifically, having an aromatic hydrocarbon ring or an aromatic heterocyclic ring as a component).
- the preferred range of the content of the aromatic skeleton (aromatic ring) constituting the compound represented by the general formula (2) is the total mass of the non-light emitting organic material used in the light emitting layer. 60% or more, more preferably 80% or more.
- non-light-emitting organic material represented by the general formula (2) can be preferably used as a host compound in the organic EL device of the present invention.
- the host compound will be described in detail later.
- X represents NR ′, O, S, PR ′, PR′R ′′ R ′′ ′′, CR′R ′′, or SiR′R ′′.
- the substituents represented by R ′, R ′′, R ′′ ′ are alkyl groups (for example, methyl group, ethyl group, propyl group, isopropyl group, t-butyl group, Pentyl group, hexyl group, octyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, etc.), cycloalkyl group (for example, cyclopentyl group, cyclohexyl group, etc.), alkenyl group (for example, vinyl group, allyl group, etc.), Alkynyl group (for example, ethynyl group, propargyl group, etc.), aromatic hydrocarbon ring group (also called aromatic carbocyclic group, aryl group, etc.), for example, phenyl group, chlorophenyl group, mesityl group, tolyl group,
- substituents may be further substituted with the above substituents.
- a plurality of these substituents may be bonded to each other to form a ring.
- X is preferably NR 2 or O
- R 2 is an aromatic hydrocarbon group (also referred to as an aromatic carbocyclic group, an aryl group, etc., for example, a phenyl group, a p-chlorophenyl group, a mesityl group, A tolyl group, a xylyl group, a naphthyl group, an anthryl group, an azulenyl group, an acenaphthenyl group, a fluorenyl group, a phenanthryl group, an indenyl group, a pyrenyl group, a biphenylyl group), or an aromatic heterocyclic group (for example, a furyl group, a thienyl group, a pyridyl group) Group, pyridazinyl group, pyrimidinyl group, pyrazinyl group, triazinyl group, imidazolyl group, pyr
- aromatic hydrocarbon ring group and aromatic heterocyclic group each have a substituent having the same meaning as the substituent represented by R ′, R ′′, R ′′ ′ in X of the general formula (2). May be.
- Ar represents an aromatic hydrocarbon ring group or an aromatic heterocyclic group.
- Examples of the aromatic hydrocarbon ring group represented by Ar include a benzene ring, biphenyl ring, naphthalene ring, azulene ring, anthracene ring, phenanthrene ring, pyrene ring, chrysene ring, naphthacene ring, triphenylene ring, and o-terphenyl ring.
- the aromatic hydrocarbon ring group represented by Ar is preferably a group derived from a benzene ring, and more preferably a substituent. And a group derived from a benzene ring having a carbazolyl group is particularly preferable.
- aromatic hydrocarbon ring group represented by Ar groups derived from three or more condensed rings are also mentioned as a preferred embodiment, and aromatics in which three or more rings are condensed
- group derived from the aromatic hydrocarbon condensed ring include naphthacene ring, anthracene ring, tetracene ring, pentacene ring, hexacene ring, phenanthrene ring, pyrene ring, benzopyrene ring, benzoazulene ring, chrysene ring, benzochrysene Ring, acenaphthene ring, acenaphthylene ring, triphenylene ring, coronene ring, benzocoronene ring, hexabenzocoronene ring, fluorene ring, benzofluorene ring, fluoranthene ring, perylene ring, naph
- these rings may further have a substituent having the same meaning as each of the substituents represented by R ′, R ′′, and R ′′ ′ in X of the general formula (2).
- Examples of the aromatic heterocyclic group represented by Ar include a furan ring, dibenzofuran ring, thiophene ring, oxazole ring, pyrrole ring, pyridine ring, pyridazine ring, pyrimidine ring, pyrazine ring, triazine ring, benzimidazole ring, Oxadiazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, indole ring, indazole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, cinnoline ring, quinoline ring, isoquinoline ring, A group derived from a phthalazine ring, a naphthyridine ring, a carbazole ring, a carboline ring, a diazacarba
- a group derived from an aromatic heterocyclic ring in which three or more rings are condensed can be mentioned as a preferred embodiment, specifically, , Acridine ring, benzoquinoline ring, carbazole ring, carboline ring, phenazine ring, phenanthridine ring, phenanthroline ring, carboline ring, cyclazine ring, kindlin ring, tepenidine ring, quinindrine ring, triphenodithiazine ring, triphenodioxazine ring , Phenanthrazine ring, anthrazine ring, perimidine ring, diazacarbazole ring (representing any one of carbon atoms constituting carboline ring replaced by nitrogen atom), phenanthroline ring, dibenzofuran ring, dibenzothiophene ring, naphthofuran Ring,
- the aromatic heterocyclic group represented by Ar is preferably a group derived from a carbazole ring, a carboline ring, or a dibenzofuran ring, and more preferably used.
- a group derived from a carbazole ring or a carboline ring particularly preferably a group derived from a benzene ring having a carbazolyl group.
- these rings may further have a substituent having the same meaning as the substituent represented by R ′, R ′′, R ′′ ′ in the general formula (2).
- n represents an integer of 0 to 8, preferably 0 to 2, particularly preferably 1 to 2 when X is O or S.
- R ′ In NR ′, O, S, PR ′, PR′R ′′ R ′′ ′, CR′R ′′, or SiR′R ′′ represented by X, Y, and Z in the general formula (3), R ′,
- the substituents represented by R ′′ and R ′′ ′ have the same meaning as the substituents represented by R ′, R ′′ and R ′′ ′, respectively, in X of the general formula (2).
- the three condensed rings of the general formula (3) are directly bonded to each other, and the bonding position may be any position on the condensed ring.
- the benzene ring may have a substituent.
- the compound represented by the general formula (2) or (3) is preferably used, and the compound represented by the general formula (2) or (3) is: It is preferably used as a host compound of the light emitting layer according to the organic EL device of the present invention.
- the host compound a host compound having both a dibenzofuran ring and a carbazole ring is particularly preferable.
- a-1 to a-41) of the host compound represented by the general formula (2) are shown below, but are not limited thereto.
- a-1, 2, 3, 5, 6, 11, 13, 20, 27, 29, 35, 36, 39, and 41 are compounds represented by the general formula (3). is there.
- the host compound contained in the light emitting layer of the organic EL device of the present invention is preferably a compound having a phosphorescence quantum yield of phosphorescence emission of less than 0.1 at room temperature (25 ° C.), more preferably a phosphorescence quantum yield. Less than 0.01.
- the compound represented by the general formula (2) or (3) used as the non-light-emitting organic material according to the present invention is preferably used as the host compound.
- non-light-emitting organic material or the host compound a conventionally known host compound may be used in combination with the compound represented by the general formula (2) or (3). In combination, it may be used alone or in combination.
- a compound having a hole transporting ability and an electron transporting ability, which prevents the emission of light from being increased in wavelength, and has a high Tg (glass transition temperature) is preferable.
- the glass transition point (Tg) is a value determined by a method based on JIS-K-7121 using DSC (Differential Scanning Colorimetry).
- the host compound used in the present invention is preferably a carbazole derivative.
- the above-mentioned conventionally known host compounds can also be used as the non-luminescent organic material according to the present invention.
- Luminescent dopant also referred to as luminescent dopant compound
- the luminescent dopant according to the present invention will be described.
- At least one phosphorescent dopant (also referred to as a phosphorescent compound or a phosphorescent compound) is used.
- a phosphorescent dopant is a compound in which light emission from an excited triplet is observed, specifically a compound that emits phosphorescence at room temperature (25 ° C.) and has a phosphorescence quantum yield. Although defined as a compound of 0.01 or more at 25 ° C., a preferred phosphorescence quantum yield is 0.1 or more.
- the above phosphorescence quantum yield can be measured by the method described in Spectra II, page 398 (1992 edition, Maruzen) of the Fourth Edition Experimental Chemistry Course 7.
- the phosphorescence quantum yield in a solution can be measured using various solvents, but when using a phosphorescent material in the present invention, the above phosphorescence quantum yield (0.01 or more) is achieved in any solvent. It only has to be done.
- a carrier trap type in which light emission from a light-emitting dopant can be obtained, but in any case, it is a condition that the excited state energy of the phosphorescent light-emitting dopant is lower than the excited state energy of the host compound.
- the phosphorescent dopant can be appropriately selected from known ones used in the light emitting layer of the organic EL device, and preferably contains a transition metal element of Group 8 to Group 10 in the periodic table of elements. More preferred are iridium compounds, more preferably iridium compounds, osmium compounds, or platinum compounds (platinum complex compounds), rare earth complexes, most preferred are iridium compounds, and more specifically, the above general formula
- the phosphorescent dopant represented by (1) is preferably used.
- examples of the substituent represented by R 1 include an alkyl group (for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group).
- examples of the 5-membered ring to 7-membered ring formed by Z include a benzene ring, naphthalene ring, pyridine ring, pyrimidine ring, pyrrole ring, thiophene ring, pyrazole ring, imidazole ring, and oxazole ring. And a thiazole ring. Of these, a benzene ring is preferred.
- the aromatic nitrogen-containing heterocycle formed by B 1 to B 5 is preferably a monocycle, such as a pyrrole ring, a pyrazole ring, an imidazole ring, a triazole ring, a tetrazole ring, an oxazole ring, Examples thereof include an oxazole ring, a thiazole ring, an isothiazole ring, an oxadiazole ring, and a thiadiazole ring.
- a pyrazole ring and an imidazole ring are preferable, and an imidazole ring in which B 2 and B 5 are nitrogen atoms is particularly preferable.
- R 1 may be further substituted with a substituent represented by R 1 in the general formula (1).
- substituents are an alkyl group and an aryl group, and more preferably an aryl group.
- L 1 represents an atomic group to form a bidentate ligand with X 1, X 2.
- Specific examples of the bidentate ligand represented by X 1 -L 1 -X 2 include phenylpyridine, phenylpyrazole, phenylimidazole, phenyltriazole, phenyltetrazole, pyrazabol, picolinic acid and acetylacetone. It is done.
- m1 represents an integer of 1, 2 or 3
- m2 represents an integer of 0, 1 or 2
- m1 + m2 is 2 or 3.
- m2 is 0 is preferable.
- transition metal element represented by M 1 a transition metal element of Group 8 to Group 10 (also simply referred to as transition metal) of the periodic table of elements is used, and among these, iridium and platinum are preferable. More preferably, it is iridium.
- phosphorescent dopant phosphorescent compound represented by the general formula (1)
- the present invention is not limited to these.
- the phosphorescent dopant (phosphorescent compound) represented by the general formula (1) according to the present invention has a HOMO (maximum occupied orbital) energy in the range of ⁇ 5.15 to ⁇ 3.50 eV,
- the LUMO (lowest orbit) energy is in the range of -1.25 to +1.00 eV, preferably the HOMO energy is in the range of -4.80 to -3.50 eV, and the LUMO energy is -0.80. It is in the range of up to +1.00 eV.
- the injection layer can be provided as necessary.
- the injection layer there are an electron injection layer and a hole injection layer.
- the injection layer may exist between the anode and the light emitting layer or the hole transport layer and between the cathode and the light emitting layer or the electron transport layer.
- the injection layer referred to in the present invention is a layer provided between the electrode and the organic functional layer in order to lower the driving voltage and improve the light emission luminance.
- Injection materials include triazole derivatives, oxadiazole derivatives, imidazole derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives.
- the details of the electron injection layer are described in, for example, JP-A-6-325871, JP-A-9-17574, and JP-A-10-74586, and specific examples thereof include strontium and aluminum.
- the buffer layer (injection layer) is desirably a very thin film, and potassium fluoride and sodium fluoride are preferable.
- the film thickness is in the range of 0.1 to 5 ⁇ m, preferably in the range of 0.1 to 100 nm, more preferably in the range of 0.5 to 10 nm, and most preferably in the range of 0.5 to 4 nm. .
- Hole transport layer 4 As the hole transport material constituting the hole transport layer, the same compounds as those applied in the hole injection layer can be used, and further, porphyrin compounds, aromatic tertiary amine compounds, and styryl. It is preferable to use an amine compound, particularly an aromatic tertiary amine compound.
- aromatic tertiary amine compounds and styrylamine compounds include N, N, N ′, N′-tetraphenyl-4,4′-diaminophenyl; N, N′-diphenyl-N, N′— Bis (3-methylphenyl)-[1,1′-biphenyl] -4,4′-diamine (TPD); 2,2-bis (4-di-p-tolylaminophenyl) propane; 1,1-bis (4-di-p-tolylaminophenyl) cyclohexane; N, N, N ′, N′-tetra-p-tolyl-4,4′-diaminobiphenyl; 1,1-bis (4-di-p-tolyl) Aminophenyl) -4-phenylcyclohexane; bis (4-dimethylamino-2-methylphenyl) phenylmethane; bis (4-di-p-tolylaminoph
- polymer materials in which these materials are introduced into polymer chains or these materials are used as polymer main chains can also be used.
- inorganic compounds such as p-type-Si and p-type-SiC can also be used as the hole injection material and the hole transport material.
- JP-A-4-297076 JP-A-2000-196140, JP-A-2001-102175, J. Pat. Appl. Phys. , 95, 5773 (2004), JP-A-11-251067, J. MoI. Huang et. al. It is also possible to use a hole transport material that has so-called p-type semiconducting properties, as described in the literature (Applied Physics Letters 80 (2002), p. 139), JP 2003-519432 A. it can.
- the hole transport layer is formed by thinning the hole transport material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an ink jet method, or an LB method. Can do.
- the film thickness of the hole transport layer is not particularly limited, but is usually in the range of 5 nm to 5 ⁇ m, preferably in the range of 5 to 200 nm.
- This hole transport layer may have a single layer structure composed of one or more of the above materials.
- n described in the above exemplary compounds represents the degree of polymerization, and the weight average molecular weight is preferably in the range of 50,000 to 200,000 from the viewpoints of film formation, compound purification, and the like.
- the electron transport layer is made of a material having a function of transporting electrons, and in a broad sense, an electron injection layer and a hole blocking layer are also included in the electron transport layer.
- the electron transport layer can be provided as a single layer or a plurality of layers.
- an electron transport material also serving as a hole blocking material used for an electron transport layer adjacent to the cathode side with respect to the light emitting layer is injected from the cathode.
- any material can be selected and used from among conventionally known compounds.
- fluorene derivatives, carbazole derivatives, azacarbazole And metal complexes such as derivatives, oxadiazole derivatives, triazole derivatives, silole derivatives, pyridine derivatives, pyrimidine derivatives, 8-quinolinol derivatives, and the like.
- metal-free or metal phthalocyanine or those having terminal ends substituted with an alkyl group or a sulfonic acid group can be preferably used as the electron transporting material.
- carbazole derivatives azacarbazole derivatives, pyridine derivatives and the like are preferable in the present invention, and more preferably an azacarbazole derivative.
- the electron transport layer can be formed by thinning the electron transport material by a known method such as a spin coating method, a casting method, a printing method including an ink jet method, an LB method, and the like, preferably It can be formed by a wet process using a coating solution containing an electron transport material, semiconductor nanoparticles (see later), and a fluorinated alcohol solvent.
- the film thickness of the electron transport layer is not particularly limited, but is usually in the range of 5 nm to 5 ⁇ m, preferably in the range of 5 to 200 nm.
- the electron transport layer may have a single layer structure composed of one or more of the above materials.
- an electron transport layer having a high n property doped with impurities as a guest material can also be used.
- impurities include JP-A-4-297076, JP-A-10-270172, JP-A-2000-196140, 2001-102175, J.A. Appl. Phys. 95, 5773 (2004), and the like.
- the electron transport layer used in the present invention preferably contains an organic alkali metal salt.
- organic alkali metal salt there are no particular restrictions on the type of organic substance, but formate, acetate, propionic acid, butyrate, valerate, caproate, enanthate, caprylate, oxalate, malonate, succinate Benzoate, phthalate, isophthalate, terephthalate, salicylate, pyruvate, lactate, malate, adipate, mesylate, tosylate, benzenesulfonate , Preferably formate, acetate, propionate, butyrate, valerate, caprate, enanthate, caprylate, oxalate, malonate, succinate, benzoate, more preferably Is preferably an alkali metal salt of an aliphatic carboxylic acid such as formate, acetate, propionate or butyrate, and the aliphatic carboxylic acid preferably has
- the type of alkali metal of the organic alkali metal salt is not particularly limited, and examples thereof include Na, K, and Cs, preferably K, Cs, and more preferably Cs.
- alkali metal salt of the organic substance examples include a combination of the organic substance and the alkali metal, preferably, formic acid Li, formic acid K, formic acid Na, formic acid Cs, acetic acid Li, acetic acid K, Na acetate, acetic acid Cs, propionic acid Li, Na propionate, propionate K, propionate Cs, oxalate Li, oxalate Na, oxalate K, oxalate Cs, malonate Li, malonate Na, malonic acid K, malonic acid Cs, succinic acid Li, succinic acid Na, succinic acid K, succinic acid Cs, benzoic acid Li, benzoic acid Na, benzoic acid K, benzoic acid Cs, more preferably Li acetate, K acetate, Na acetate, Cs acetate, most preferably Cs acetate.
- the content of these dope materials is preferably in the range of 1.5 to 35% by mass, more preferably in the range of 3 to 25% by mass, and most preferably in the range of 5 to 5% with respect to the electron transport layer to be added. It is in the range of 15% by mass.
- an electrode material made of a metal, an alloy, an electrically conductive compound and a mixture thereof having a high work function (4 eV or more) is preferably used.
- electrode substances include metals such as Au, and conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2 , and ZnO.
- conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2 , and ZnO.
- an amorphous material such as IDIXO (In 2 O 3 —ZnO) that can form a transparent conductive film may be used.
- these electrode materials may be formed into a thin film by a method such as vapor deposition or sputtering, and a desired shape pattern may be formed by a photolithography method, or when pattern accuracy is not required (about 100 ⁇ m or more). May form a pattern through a mask having a desired shape at the time of vapor deposition or sputtering of the electrode material.
- a wet film forming method such as a printing method or a coating method can be used.
- the transmittance is preferably larger than 10%, and the sheet resistance as the anode is preferably several hundred ⁇ / ⁇ or less.
- the film thickness depends on the material, it is usually in the range of 10 to 1000 nm, preferably in the range of 10 to 200 nm.
- an electrode material made of a metal referred to as an electron injecting metal
- an alloy referred to as an electrically conductive compound
- a mixture thereof having a small work function (4 eV or less) Used.
- Electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al 2 O 3 ) Mixtures, indium, lithium / aluminum mixtures, rare earth metals and the like.
- a mixture of an electron injecting metal and a second metal which is a stable metal having a larger work function than this for example, a magnesium / silver mixture
- a magnesium / aluminum mixture a magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al 2 O 3 ) mixture, a lithium / aluminum mixture, aluminum and the like.
- the cathode 8 can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- the sheet resistance as the cathode 8 is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected within the range of 10 nm to 5 ⁇ m, preferably within the range of 50 to 200 nm.
- the emission luminance is advantageously improved.
- the conductive transparent material mentioned in the description of the anode 2 is formed thereon, whereby the transparent or translucent cathode 8 is formed.
- an organic EL element in which both the anode 2 and the cathode 8 are transmissive can be manufactured.
- the support substrate (hereinafter also referred to as a substrate, substrate, substrate, support, etc.) according to the organic EL device of the present invention is not particularly limited in the type of glass, plastic, etc. Also, it is transparent or opaque. There may be. When light is extracted from the support substrate 1 side, the support substrate 1 is preferably transparent.
- the transparent support substrate 1 that can be used include glass, quartz, and a transparent resin film. Since the effect of suppressing high-temperature storage stability and chromaticity variation appears greatly in a flexible substrate than a rigid substrate, a particularly preferable support substrate has flexibility that can give flexibility to an organic EL element. Resin film.
- polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, cellulose diacetate, cellulose triacetate, cellulose acetate butyrate, cellulose acetate propionate (CAP), Cellulose esters such as cellulose acetate phthalate (TAC) and cellulose nitrate or derivatives thereof, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene resin, polymethylpentene, polyether ketone, polyimide , Polyethersulfone (PES), polyphenylene sulfide, polysulfones Cycloolefin resins such as polyetherimide, polyetherketoneimide, polyamide, fluororesin, nylon, polymethylmethacrylate, acrylic or polyarylate, Arton (trade name, manufactured by JSR) or Appel (
- the surface of the resin film may be formed with an inorganic film, an organic film, or a hybrid film of both, and the water vapor permeability (25 ⁇ 0.5 ° C.) measured by a method according to JIS K 7129-1992. , And a relative humidity (90 ⁇ 2)% RH) of 0.01 g / (m 2 ⁇ 24 h) or less is preferable, and oxygen permeability measured by a method according to JIS K 7126-1987 is also preferable.
- the film is preferably a high barrier film having a degree of 10 ⁇ 3 cm 3 / (m 2 ⁇ 24 h ⁇ atm) or less and a water vapor permeability of 10 ⁇ 3 g / (m 2 ⁇ 24 h) or less. More preferably, the degree is 10 ⁇ 5 g / (m 2 ⁇ 24 h) or less.
- any material may be used as long as it has a function of suppressing entry of factors that cause deterioration of the organic EL element such as moisture and oxygen.
- silicon oxide, silicon dioxide, silicon nitride, or the like is used. Can do.
- laminate stack both alternately several times.
- the method for forming the barrier film is not particularly limited.
- the vacuum deposition method, sputtering method, reactive sputtering method, molecular beam epitaxy method, cluster ion beam method, ion plating method, plasma polymerization method, atmospheric pressure plasma A polymerization method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, and the like can be used, but an atmospheric pressure plasma polymerization method as described in JP-A-2004-68143 is particularly preferable.
- Examples of the opaque support substrate 1 include metal plates such as aluminum and stainless steel, films, opaque resin substrates, ceramic substrates, and the like.
- the external extraction efficiency of light emission at room temperature is preferably 1% or more, more preferably 5% or more.
- the external extraction quantum efficiency (%) the number of photons emitted to the outside of the organic EL element / the number of electrons sent to the organic EL element ⁇ 100.
- Sealing (sealing adhesive 9, sealing member 10)
- a sealing means applicable to the organic EL element of the present invention for example, a method of adhering a sealing member, an electrode, and a support substrate with an adhesive can be mentioned.
- the sealing member may be disposed so as to cover the display area of the organic EL element, and may be a concave plate shape or a flat plate shape. Further, transparency and electrical insulation are not particularly limited.
- Specific examples include a glass plate, a polymer plate / film, and a metal plate / film.
- the glass plate include soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz.
- the polymer plate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polysulfone.
- the metal plate include those made of one or more metals or alloys selected from the group consisting of stainless steel, iron, copper, aluminum, magnesium, nickel, zinc, chromium, titanium, molybdenum, silicone, germanium, and tantalum.
- a polymer film and a metal film can be preferably used because the element can be thinned.
- the polymer film has an oxygen permeability measured by a method according to JIS K 7126-1987 of 1 ⁇ 10 ⁇ 3 cm 3 / (m 2 ⁇ 24 h ⁇ atm) or less, according to JIS K 719-1992.
- the water vapor permeability (25 ⁇ 0.5 ° C., relative humidity (90 ⁇ 2)% RH) measured by the above method is preferably 1 ⁇ 10 ⁇ 3 g / (m 2 ⁇ 24 h) or less.
- sealing member For processing the sealing member into a concave shape, sandblasting, chemical etching, or the like is used.
- the adhesive include photocuring and thermosetting adhesives having reactive vinyl groups of acrylic acid oligomers and methacrylic acid oligomers, and moisture curing adhesives such as 2-cyanoacrylates. Can be mentioned. Moreover, heat
- an organic EL element may deteriorate by heat processing, what can be adhesively cured from room temperature to 80 ° C. is preferable. Further, a desiccant may be dispersed in the adhesive. Application
- coating of the adhesive agent to a sealing part may use commercially available dispenser, and may print like screen printing.
- the electrode and the organic functional layer are coated on the outside of the electrode facing the support substrate with the organic functional layer interposed therebetween, and an inorganic or organic layer is formed in contact with the support substrate to form a sealing film.
- the material for forming the film may be any material that has a function of suppressing intrusion of elements that cause deterioration of elements such as moisture and oxygen.
- silicon oxide, silicon dioxide, silicon nitride, or the like may be used. it can.
- vacuum deposition sputtering, reactive sputtering, molecular beam epitaxy, cluster ion beam method, ion plating method, plasma polymerization method, atmospheric pressure plasma
- a polymerization method a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be used.
- an inert gas such as nitrogen or argon, an inert gas such as fluorinated hydrocarbon or silicon oil is used. It is preferable to inject a liquid. A vacuum is also possible. Moreover, a hygroscopic compound can also be enclosed inside.
- hygroscopic compound examples include metal oxides (for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide) and sulfates (for example, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt sulfate).
- metal oxides for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide
- sulfates for example, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt sulfate.
- metal halides eg calcium chloride, magnesium chloride, cesium fluoride, tantalum fluoride, cerium bromide, magnesium bromide, barium iodide, magnesium iodide etc.
- perchloric acids eg perchloric acid Barium, magnesium perchlorate, and the like
- anhydrous salts are preferably used in sulfates, metal halides, and perchloric acids.
- Sealing includes casing type sealing (can sealing) and close contact type sealing (solid sealing), but solid sealing is preferable from the viewpoint of thinning. Moreover, when producing a flexible organic EL element, since sealing is also required for the sealing member, solid sealing is preferable.
- thermosetting adhesive an ultraviolet curable resin, or the like
- a thermosetting adhesive such as an epoxy resin, an acrylic resin, or a silicone resin, more preferably moisture resistant. It is an epoxy thermosetting adhesive resin that is excellent in water resistance and water resistance and has little shrinkage during curing.
- the water content of the sealing adhesive according to the present invention is preferably 300 ppm or less, more preferably in the range of 0.01 to 200 ppm, and most preferably in the range of 0.01 to 100 ppm. preferable.
- the moisture content referred to in the present invention may be measured by any method.
- a volumetric moisture meter Karl Fischer
- an infrared moisture meter a microwave transmission moisture meter
- a heat-dry weight method GC / MS
- IR IR
- DSC Denssion Calorimeter
- TDS Temporal Scanning Calorimeter
- moisture can be measured from a pressure increase caused by evaporation of moisture, and moisture content of a film or a solid film can be measured.
- the moisture content of the sealing adhesive can be adjusted by, for example, placing it in a nitrogen atmosphere with a dew point temperature of ⁇ 80 ° C. or lower and an oxygen concentration of 0.8 ppm, and changing the time. Further, it can be dried in a vacuum state of 100 Pa or less while changing the time. Further, the sealing adhesive can be dried only with an adhesive, but can also be placed in advance on the sealing member and dried.
- the sealing member for example, a 50 ⁇ m thick PET (polyethylene terephthalate) laminated with an aluminum foil (30 ⁇ m thick) is used.
- a sealing adhesive is placed in advance, the resin substrate 1 and the sealing member 5 are aligned, and then both are crimped ( In the range of 0.1 to 3 MPa) and in the temperature range of 80 to 180 ° C., they are tightly bonded and bonded (adhered) to be tightly sealed (solid sealed).
- the heating or pressure bonding time will vary, but it will be temporarily bonded at a pressure within the range of 0.1 to 3 MPa, and the thermosetting time will be 5 seconds at a temperature within the range of 80 to 180 ° C. Select in a range of up to 10 minutes.
- a heated pressure-bonding roll because pressure bonding (temporary bonding) and heating can be performed simultaneously, and internal voids can be eliminated simultaneously.
- a coating method such as roll coating, spin coating, screen printing, spray coating, or the like can be used using a dispenser depending on the material.
- solid sealing is a form in which there is no space between the sealing member and the organic EL element substrate and the resin is covered with a cured resin.
- the sealing member include metals such as stainless steel, aluminum, and magnesium alloys, polyethylene terephthalate, polycarbonate, polystyrene, nylon, plastics such as polyvinyl chloride, and composites thereof, glass, and the like.
- a laminate of gas barrier layers such as aluminum, aluminum oxide, silicon oxide, and silicon nitride can be used as in the case of a resin substrate.
- the gas barrier layer can be formed by sputtering, vapor deposition or the like on both surfaces or one surface of the sealing member before molding the sealing member, or may be formed on both surfaces or one surface of the sealing member after sealing by a similar method. .
- oxygen permeability is 1 ⁇ 10 ⁇ 3 ml / (m 2 ⁇ 24 h ⁇ atm) or less
- water vapor permeability 25 ⁇ 0.5 ° C.
- relative humidity (90 ⁇ 2)% RH) is 1 ⁇ It is preferably 10 ⁇ 3 g / (m 2 ⁇ 24 h) or less.
- the sealing member may be a film laminated with a metal foil such as aluminum.
- a method for laminating the polymer film on one side of the metal foil a generally used laminating machine can be used.
- the adhesive polyurethane-based, polyester-based, epoxy-based, acrylic-based adhesives and the like can be used. You may use a hardening
- a hot melt lamination method, an extrusion lamination method and a coextrusion lamination method can also be used, but a dry lamination method is preferred.
- the metal foil when the metal foil is formed by sputtering or vapor deposition and is formed from a fluid electrode material such as a conductive paste, it may be produced by a method of forming a metal foil on a polymer film as a base material. Good.
- a protective film or a protective plate may be provided outside the sealing film on the side facing the support substrate with the organic functional layer interposed therebetween or on the outer side of the sealing film.
- the mechanical strength is not necessarily high, and thus it is preferable to provide such a protective film and a protective plate.
- the same glass plate, polymer plate / film, metal plate / film, and the like used for the sealing can be used.
- the polymer film is light and thin. Is preferably used.
- a light extraction member between the flexible support substrate and the anode or at any position on the light emission side from the flexible support substrate.
- Examples of the light extraction member include a prism sheet, a lens sheet, and a diffusion sheet.
- generates total reflection, or any medium, a diffusion structure, etc. are mentioned.
- an organic electroluminescence element that emits light from a substrate
- a part of the light emitted from the light emitting layer causes total reflection at the interface between the substrate and air, causing a problem of loss of light.
- the prism surface, lens-like processing is applied to the surface of the substrate, or the prism sheet, the lens sheet and the diffusion sheet are attached to the surface of the substrate, thereby suppressing the total reflection and the light extraction efficiency. To improve.
- a desired electrode material for example, a thin film made of an anode material is formed on a suitable substrate by a thin film forming method such as vapor deposition or sputtering so as to have a film thickness of 1 ⁇ m or less, preferably in the range of 10 to 200 nm.
- a thin film forming method such as vapor deposition or sputtering so as to have a film thickness of 1 ⁇ m or less, preferably in the range of 10 to 200 nm.
- an organic functional layer (organic compound thin film) of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer, which are organic EL element materials, is formed thereon.
- the step of forming the organic functional layer mainly includes a step of applying and laminating the coating liquid constituting the organic functional layer on the anode of the support substrate and a step of drying the coating liquid after coating and lamination. Composed.
- the step of applying and drying may be performed in the air, but the step of drying is preferably performed in an inert gas atmosphere such as nitrogen, and the step of applying is also preferably performed in an inert gas atmosphere. .
- the inert gas atmosphere preferably contains 100 ppm or less of water or oxygen, more preferably 10 ppm or less, and even more preferably 1 ppm or less.
- vapor deposition method for example, spin coating method, casting method, die coating method, blade coating method, roll coating method, ink jet method, printing method, spray coating method, curtain coating method, LB) (A Langmuir-Blodgett method or the like can be used), and at least the hole injection layer is preferably formed using a wet process.
- a wet process is preferable in the present invention because it is easy to obtain a homogeneous film and it is difficult to generate pinholes.
- Film formation by a coating method such as a method, a die coating method, a blade coating method, a roll coating method or an ink jet method is preferred.
- liquid medium for dissolving or dispersing the organic EL material according to the present invention examples include ketones such as methyl ethyl ketone and cyclohexanone, fatty acid esters such as ethyl acetate, halogenated hydrocarbons such as dichlorobenzene, toluene, xylene, and mesitylene.
- Aromatic hydrocarbons such as cyclohexylbenzene, aliphatic hydrocarbons such as cyclohexane, decalin, and dodecane
- organic solvents such as dimethylformamide (DMF) and dimethylsulfoxide (DMSO) can be used.
- a dispersion method it can be dispersed by a dispersion method such as ultrasonic wave, high shearing force dispersion or media dispersion.
- distributes the organic EL material which concerns on this invention is in inert gas atmosphere, and the process is not exposed to application
- the coating / laminating and drying processes of these layers may be single wafer manufacturing or line manufacturing.
- the atmosphere at the time of applying each layer may be common, but from the viewpoint of the influence of the solvent that volatilizes, it is preferable that the coating booth of each layer is surrounded by a partition wall and the circulation of the atmosphere is independent.
- the drying process may be performed while being conveyed on the line, but from the viewpoint of productivity, it may be deposited or rolled in a non-contact manner in a roll form.
- a thin film made of a cathode material is formed thereon by a method such as vapor deposition or sputtering so as to have a thickness of 1 ⁇ m or less, preferably in the range of 50 to 200 nm.
- the organic EL element can be produced by adhering the contact sealing or sealing member to the electrode and the support substrate with an adhesive.
- the organic EL element of the present invention can be used as a display device, a display, and various light emission sources.
- Examples of light sources include home lighting, interior lighting, clock and liquid crystal backlights, billboard advertisements, traffic lights, light sources for optical storage media, light sources for electrophotographic copying machines, light sources for optical communication processors, and light sources for optical sensors. Furthermore, it can be used in a wide range of applications such as general household appliances that require a display device, but it can be used effectively as a backlight for a liquid crystal display device combined with a color filter, and as a light source for illumination. it can.
- patterning may be performed by a metal mask, an ink jet printing method, or the like during film formation, if necessary.
- patterning only the electrode may be patterned, the electrode and the light emitting layer may be patterned, or the entire layer of the element may be patterned.
- a conventionally known method is used. Can do.
- a polyethylene naphthalate film (a film made by Teijin DuPont, hereinafter abbreviated as PEN) was used.
- An inorganic gas barrier film made of SiOx is continuously formed on the front surface of the flexible film on the side on which the anode is formed, using an atmospheric pressure plasma discharge treatment apparatus having the structure described in JP-A-2004-68143.
- ITO indium tin oxide
- the pattern was such that the light emission area was 50 mm square.
- the patterned ITO substrate was subjected to ultrasonic cleaning with isopropyl alcohol, dried with dry nitrogen gas, and UV ozone cleaning was performed for 5 minutes.
- a solution of poly (3,4-ethylenedioxythiophene) -polystyrene sulfonate (abbreviated as PEDOT / PSS, manufactured by Bayer, Baytron P Al 4083) diluted to 70% with pure water at 3000 rpm for 30 seconds.
- PEDOT / PSS poly(1,4-ethylenedioxythiophene) -polystyrene sulfonate
- Film formation was performed in an air atmosphere. Then, it dried at 200 degreeC for 1 hour, and provided the 30-nm-thick hole injection layer.
- the light emitting layer composition of the following composition was each formed into a film by the spin coat method at 1500 rpm for 30 seconds, and it dried at 120 degreeC for 30 minutes, and formed the light emitting layer with a film thickness of 40 nm.
- Non-light emitting organic material (a-6, a-41, a-31) a-6 12.000 parts by weight a-41 1.970 parts by weight a-31 0.170 parts by weight
- a-6, a-41 and a-31 are host compounds.
- Luminescent dopant (D-66, D-67, D-80) D-66 2.450 parts by mass D-67 0.025 parts by mass D-80 0.025 parts by mass Solvent Toluene 2,000 parts by mass (Preparation of electron transport layer) Subsequently, a solution obtained by dissolving 20 mg of Compound A in 4 ml of tetrafluoropropanol (TFPO) was formed by spin coating at 1500 rpm for 30 seconds, dried at 120 ° C. for 30 minutes, and electron transport having a thickness of 30 nm. Layered.
- TFPO tetrafluoropropanol
- substrate The element in the middle of preparation provided to the electron carrying layer
- a molybdenum resistance heating boat containing potassium fluoride is attached to a vacuum deposition apparatus, and the vacuum chamber is depressurized to 4 ⁇ 10 ⁇ 5 Pa, and then the boat is energized and heated to reduce potassium fluoride to 0.
- An electron injection layer having a thickness of 2 nm was formed on the electron transport layer at 0.02 nm / second. Subsequently, 100 nm of aluminum was deposited to form a cathode.
- a polyethylene terephthalate (PET) film (12 ⁇ m thickness) is bonded to a flexible aluminum foil (manufactured by Toyo Aluminum Co., Ltd.) with a thickness of 30 ⁇ m.
- PET polyethylene terephthalate
- a laminate (a thickness of the adhesive layer of 1.5 ⁇ m) using a urethane adhesive) was used.
- thermosetting adhesive as a sealing adhesive was uniformly applied to the aluminum surface at a thickness of 20 ⁇ m along the adhesive surface (shiny surface) of the aluminum foil using a dispenser. This was dried under a vacuum of 100 Pa or less for 12 hours.
- thermosetting adhesive an epoxy adhesive mixed with the following (A) to (C) was used.
- the sealing substrate is closely attached and disposed so as to cover the joint between the extraction electrode and the electrode lead so as to be in the form shown in FIG.
- the organic EL element 6 (invention) was produced by tightly sealing using a roll under pressure bonding conditions, a pressure roll temperature of 120 ° C., a pressure of 0.5 MPa, and an apparatus speed of 0.3 m / min.
- Non-light emitting organic material (a-6, a-10, a-12, a-17, a-24, a-26, a-30, a-31, a-33, a-41) a-6 1.414 parts by weight a-10 1.414 parts by weight a-12 1.414 parts by weight a-17 1.414 parts by weight a-24 1.414 parts by weight a-26 1.414 parts by weight a- 30 1.414 parts by weight a-31 1.414 parts by weight a-33 1.414 parts by weight a-41 1.414 parts by weight a-6, a-10, a-12, a-17, a- 24, a-26, a-30, a-31, a-33, and a-41 are host compounds.
- Luminescent dopant (D-66, D-67, D-80) D-66 2.450 parts by mass D-67 0.025 parts by mass D-80 0.025 parts by mass Solvent Toluene 2,000 parts by mass
- the power efficiency of each element was expressed as a relative value with the measured value of the organic EL element 1 (comparative example) as 100. The higher the value, the better the efficiency.
- Each organic EL element is wound around a cylinder with a radius of 5 cm, continuously driven with the element bent, and the luminance is measured using a spectral radiance meter CS-2000 (manufactured by Konica Minolta Sensing). The measured luminance is reduced by half. The time to perform (LT50) was determined.
- the driving condition was set to a current value of 4000 cd / m 2 at the start of continuous driving.
- the element was wound and stored in a constant temperature bath at 85 ° C. for 500 hours. A voltage of 2.5 mA / cm 2 was measured with the element taken out from the thermostatic chamber wound (after storage at high temperature).
- the voltage change after high-temperature storage (voltage at 2.5mA / cm 2) - represents an initial state (2.5mA / cm 2).
- the organic EL elements 6 to 21 of the present invention are excellent in all of efficiency and voltage change during high temperature storage (storage stability at high temperature). It is clear.
- the efficiency and life are improved as the number of the non-light emitting organic material contained in the light emitting layer is increased from 3 to 4, 5 types.
- the stability at the time of high temperature storage is obtained by using the difference between the maximum value and the minimum value of five or more molecular weights within 250. It can be seen that
- Example 2 Preparation of Organic EL Element 23 (Invention) >>: Present Invention Same as the organic EL elements 1 to 21 of Example 1, except that the film from the hole transport layer to the electron transport layer was formed by the vapor deposition method described below. Produced.
- a substrate (an element in the process of being prepared up to the hole injection layer) was attached to a vacuum deposition apparatus.
- a molybdenum resistance heating boat with ⁇ -NPD placed therein is attached to a vacuum deposition apparatus, and after the vacuum tank is depressurized to 4 ⁇ 10 ⁇ 5 Pa, the boat is energized and heated to reduce ⁇ -NPD to 0.
- a hole transport layer having a thickness of 20 nm was formed on the hole injection layer at a rate of 10 nm / second.
- a resistance heating boat made of molybdenum prepared by putting one of the following light emitting layer compositions into one boat was prepared, attached to a vacuum deposition apparatus, and the vacuum chamber was depressurized to 4 ⁇ 10 ⁇ 5 Pa.
- a light emitting layer 1 having a film thickness of 20 nm was produced on the hole transport layer by co-evaporation by energizing and heating.
- the vapor deposition rate of the whole light emitting layer composition was 1.0 nm / second.
- Non-light emitting organic material (a-6, a-31) a-6 70.000 parts by mass a-31 20.000 parts by mass a-6 and a-31 are host compounds.
- Luminescent dopant D-67, D-80
- D-67 8.000 parts by mass D-80 2.000 parts by mass
- D-80 Luminescent dopant 2
- a resistance heating boat made of molybdenum prepared by putting one of the following light emitting layer compositions into one boat was prepared, attached to a vacuum deposition apparatus, and the vacuum chamber was depressurized to 4 ⁇ 10 ⁇ 5 Pa.
- a light emitting layer 2 having a film thickness of 20 nm was produced on the light emitting layer 1 by co-evaporation by energizing and heating.
- the vapor deposition rate of the whole light emitting layer composition was 1.0 nm / second.
- Non-light emitting organic material (a-6, a-41) a-41 70.000 parts by mass a-6 12.000 parts by mass a-41 is a host compound.
- Luminescent dopant (D-66) D-66 18.000 parts by mass (Preparation of electron transport layer) Subsequently, a molybdenum resistance heating boat containing Compound A was attached to a vacuum deposition apparatus, and the vacuum chamber was depressurized to 4 ⁇ 10 ⁇ 5 Pa. An electron transport layer having a thickness of 20 nm was formed on the electron transport layer at 10 nm / second.
- Evaluation of organic EL elements 22-25 was carried out in the same manner as the organic EL elements 1 to 21 of Example 1, such as power efficiency (efficiency), continuous drive stability (lifetime), high temperature storage stability (during high temperature storage) Voltage change) was evaluated.
- the organic EL device of the present invention by using three or more non-light emitting organic materials in the light emitting layer, the organic EL device has high power efficiency, excellent long-term driving stability, and high temperature storage stability. It became clear that can be provided.
- the organic EL element of the present invention Since the organic EL element of the present invention has high luminous efficiency, long emission lifetime, and high storage stability at high temperature, it can be applied to low power consumption of image display devices and lighting devices.
Abstract
Description
該発光層が少なくとも1種の発光性ドーパントと少なくとも3種の下記一般式(2)で表される非発光性有機材料とを含有し、且つ、前記非発光性有機材料のうち分子量の一番大きいものが1500以下であり、且つ、前記非発光性有機材料の最小含有率が1質量%以上であることを特徴とする有機エレクトロルミネッセンス素子。
2.前記一般式(2)で表される少なくとも3種の非発光性有機材料のうち少なくとも1種が、下記一般式(3)で表される化合物であることを特徴とする前記1に記載の有機エレクトロルミネッセンス素子。
3.前記一般式(2)で表される非発光性有機材料が5種以上含有されていることを特徴とする前記1又は2に記載の有機エレクトロルミネッセンス素子。
図1は、本発明の有機エレクトロルミネッセンス素子(有機EL素子)の概略的な構成を示す断面図であり、好ましい実施形態の一例を示すものである。
(ii)可撓性支持基板/陽極/正孔輸送層/発光層/電子輸送層/陰極/熱伝導層/封止用接着剤/封止部材
(iii)可撓性支持基板/陽極/正孔輸送層/発光層/正孔ブロック層/電子輸送層/
陰極/熱伝導層/封止用接着剤/封止部材
(iv)可撓性支持基板/陽極/正孔輸送層/発光層/正孔ブロック層/電子輸送層/陰極バッファー層/陰極/熱伝導層/封止用接着剤/封止部材
(v)可撓性支持基板/陽極/陽極バッファー層/正孔輸送層/発光層/正孔ブロック層/電子輸送層/陰極バッファー層/陰極/熱伝導層/封止用接着剤/封止部材
(vi)ガラス支持体/陽極/正孔注入層/発光層/電子注入層/陰極/封止部材
(vii)ガラス支持体/陽極/正孔注入層/正孔輸送層/発光層/電子注入層/陰極/
封止部材
(viii)ガラス支持体/陽極/正孔注入層/正孔輸送層/発光層/電子輸送層/電子注入層/陰極/封止部材
《有機EL素子の有機機能層20》
次いで、本発明の有機EL素子を構成する有機機能層の詳細について説明する。
以下、本発明の有機EL素子に係る発光層について説明する。
本発明に係る、上記一般式(2)で表される非発光性有機材料について説明する。
上記一般式(2)で表される化合物の中でも、更に好ましく用いられるのは、上記一般式(3)で表される化合物である。
本発明の有機EL素子に用いられるホスト化合物について説明する。
本発明に係る発光性ドーパントについて説明する。
一般式(1)において、R1で表される置換基としては、例えば、アルキル基(例えば、メチル基、エチル基、プロピル基、イソプロピル基、tert-ブチル基、ペンチル基、ヘキシル基、オクチル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基等)、シクロアルキル基(例えば、シクロペンチル基、シクロヘキシル基等)、アルケニル基(例えば、ビニル基、アリル基等)、アルキニル基(例えば、エチニル基、プロパルギル基等)、芳香族炭化水素環基(芳香族炭素環基、アリール基等ともいい、例えば、フェニル基、p-クロロフェニル基、メシチル基、トリル基、キシリル基、ナフチル基、アントリル基、アズレニル基、アセナフテニル基、フルオレニル基、フェナントリル基、インデニル基、ピレニル基、ビフェニリル基等)、芳香族複素環基(例えば、ピリジル基、ピリミジニル基、フリル基、ピロリル基、イミダゾリル基、ベンゾイミダゾリル基、ピラゾリル基、ピラジニル基、トリアゾリル基(例えば、1,2,4-トリアゾール-1-イル基、1,2,3-トリアゾール-1-イル基等)、オキサゾリル基、ベンゾオキサゾリル基、チアゾリル基、イソオキサゾリル基、イソチアゾリル基、フラザニル基、チエニル基、キノリル基、ベンゾフリル基、ジベンゾフリル基、ベンゾチエニル基、ジベンゾチエニル基、インドリル基、カルバゾリル基、カルボリニル基、ジアザカルバゾリル基(前記カルボリニル基のカルボリン環を構成する炭素原子の一つが窒素原子で置き換わったものを示す)、キノキサリニル基、ピリダジニル基、トリアジニル基、キナゾリニル基、フタラジニル基等)、複素環基(例えば、ピロリジル基、イミダゾリジル基、モルホリル基、オキサゾリジル基等)、アルコキシ基(例えば、メトキシ基、エトキシ基、プロピルオキシ基、ペンチルオキシ基、ヘキシルオキシ基、オクチルオキシ基、ドデシルオキシ基等)、シクロアルコキシ基(例えば、シクロペンチルオキシ基、シクロヘキシルオキシ基等)、アリールオキシ基(例えば、フェノキシ基、ナフチルオキシ基等)、アルキルチオ基(例えば、メチルチオ基、エチルチオ基、プロピルチオ基、ペンチルチオ基、ヘキシルチオ基、オクチルチオ基、ドデシルチオ基等)、シクロアルキルチオ基(例えば、シクロペンチルチオ基、シクロヘキシルチオ基等)、アリールチオ基(例えば、フェニルチオ基、ナフチルチオ基等)、アルコキシカルボニル基(例えば、メチルオキシカルボニル基、エチルオキシカルボニル基、ブチルオキシカルボニル基、オクチルオキシカルボニル基、ドデシルオキシカルボニル基等)、アリールオキシカルボニル基(例えば、フェニルオキシカルボニル基、ナフチルオキシカルボニル基等)、スルファモイル基(例えば、アミノスルホニル基、メチルアミノスルホニル基、ジメチルアミノスルホニル基、ブチルアミノスルホニル基、ヘキシルアミノスルホニル基、シクロヘキシルアミノスルホニル基、オクチルアミノスルホニル基、ドデシルアミノスルホニル基、フェニルアミノスルホニル基、ナフチルアミノスルホニル基、2-ピリジルアミノスルホニル基等)、アシル基(例えば、アセチル基、エチルカルボニル基、プロピルカルボニル基、ペンチルカルボニル基、シクロヘキシルカルボニル基、オクチルカルボニル基、2-エチルヘキシルカルボニル基、ドデシルカルボニル基、フェニルカルボニル基、ナフチルカルボニル基、ピリジルカルボニル基等)、アシルオキシ基(例えば、アセチルオキシ基、エチルカルボニルオキシ基、ブチルカルボニルオキシ基、オクチルカルボニルオキシ基、ドデシルカルボニルオキシ基、フェニルカルボニルオキシ基等)、アミド基(例えば、メチルカルボニルアミノ基、エチルカルボニルアミノ基、ジメチルカルボニルアミノ基、プロピルカルボニルアミノ基、ペンチルカルボニルアミノ基、シクロヘキシルカルボニルアミノ基、2-エチルヘキシルカルボニルアミノ基、オクチルカルボニルアミノ基、ドデシルカルボニルアミノ基、フェニルカルボニルアミノ基、ナフチルカルボニルアミノ基等)、カルバモイル基(例えば、アミノカルボニル基、メチルアミノカルボニル基、ジメチルアミノカルボニル基、プロピルアミノカルボニル基、ペンチルアミノカルボニル基、シクロヘキシルアミノカルボニル基、オクチルアミノカルボニル基、2-エチルヘキシルアミノカルボニル基、ドデシルアミノカルボニル基、フェニルアミノカルボニル基、ナフチルアミノカルボニル基、2-ピリジルアミノカルボニル基等)、ウレイド基(例えば、メチルウレイド基、エチルウレイド基、ペンチルウレイド基、シクロヘキシルウレイド基、オクチルウレイド基、ドデシルウレイド基、フェニルウレイド基ナフチルウレイド基、2-ピリジルアミノウレイド基等)、スルフィニル基(例えば、メチルスルフィニル基、エチルスルフィニル基、ブチルスルフィニル基、シクロヘキシルスルフィニル基、2-エチルヘキシルスルフィニル基、ドデシルスルフィニル基、フェニルスルフィニル基、ナフチルスルフィニル基、2-ピリジルスルフィニル基等)、アルキルスルホニル基(例えば、メチルスルホニル基、エチルスルホニル基、ブチルスルホニル基、シクロヘキシルスルホニル基、2-エチルヘキシルスルホニル基、ドデシルスルホニル基等)、アリールスルホニル基又はヘテロアリールスルホニル基(例えば、フェニルスルホニル基、ナフチルスルホニル基、2-ピリジルスルホニル基等)、アミノ基(例えば、アミノ基、エチルアミノ基、ジメチルアミノ基、ブチルアミノ基、シクロペンチルアミノ基、2-エチルヘキシルアミノ基、ドデシルアミノ基、アニリノ基、ナフチルアミノ基、2-ピリジルアミノ基等)、シアノ基、ニトロ基、ヒドロキシ基、メルカプト基、シリル基(例えば、トリメチルシリル基、トリイソプロピルシリル基、トリフェニルシリル基、フェニルジエチルシリル基等)等が挙げられる。これらの置換基のうち、好ましいものはアルキル基若しくはアリール基である。
本発明の有機EL素子においては、注入層は必要に応じて設けることができる。注入層としては電子注入層と正孔注入層があり、上記の如く陽極と発光層又は正孔輸送層の間、及び陰極と発光層又は電子輸送層との間に存在させてもよい。
正孔輸送層を構成する正孔輸送材料としては、上記正孔注入層で適用するのと同様の化合物を使用することができるが、更には、ポルフィリン化合物、芳香族第3級アミン化合物及びスチリルアミン化合物、特に芳香族第3級アミン化合物を用いることが好ましい。 芳香族第3級アミン化合物及びスチリルアミン化合物の代表例としては、N,N,N′,N′-テトラフェニル-4,4′-ジアミノフェニル;N,N′-ジフェニル-N,N′-ビス(3-メチルフェニル)-〔1,1′-ビフェニル〕-4,4′-ジアミン(TPD);2,2-ビス(4-ジ-p-トリルアミノフェニル)プロパン;1,1-ビス(4-ジ-p-トリルアミノフェニル)シクロヘキサン;N,N,N′,N′-テトラ-p-トリル-4,4′-ジアミノビフェニル;1,1-ビス(4-ジ-p-トリルアミノフェニル)-4-フェニルシクロヘキサン;ビス(4-ジメチルアミノ-2-メチルフェニル)フェニルメタン;ビス(4-ジ-p-トリルアミノフェニル)フェニルメタン;N,N′-ジフェニル-N,N′-ジ(4-メトキシフェニル)-4,4′-ジアミノビフェニル;N,N,N′,N′-テトラフェニル-4,4′-ジアミノジフェニルエーテル;4,4′-ビス(ジフェニルアミノ)クオードリフェニル;N,N,N-トリ(p-トリル)アミン;4-(ジ-p-トリルアミノ)-4′-〔4-(ジ-p-トリルアミノ)スチリル〕スチルベン;4-N,N-ジフェニルアミノ-(2-ジフェニルビニル)ベンゼン;3-メトキシ-4′-N,N-ジフェニルアミノスチルベンゼン;N-フェニルカルバゾール、さらには、米国特許第5,061,569号明細書に記載されている2個の縮合芳香族環を分子内に有するもの、例えば、4,4′-ビス〔N-(1-ナフチル)-N-フェニルアミノ〕ビフェニル(NPD)、特開平4-308688号公報に記載されているトリフェニルアミンユニットが3つスターバースト型に連結された4,4′,4″-トリス〔N-(3-メチルフェニル)-N-フェニルアミノ〕トリフェニルアミン(MTDATA)等が挙げられる。
電子輸送層とは電子を輸送する機能を有する材料からなり、広い意味で電子注入層、正孔ブロック層も電子輸送層に含まれる。電子輸送層は単層又は複数層設けることができる。
本発明の有機EL素子を構成する陽極2としては、仕事関数の大きい(4eV以上)金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが好ましく用いられる。このような電極物質の具体例としては、Au等の金属、CuI、インジウムチンオキシド(ITO)、SnO2、ZnO等の導電性透明材料が挙げられる。また、IDIXO(In2O3-ZnO)等非晶質で透明導電膜を作製可能な材料を用いてもよい。
一方、本発明の有機EL素子を構成する陰極8としては仕事関数の小さい(4eV以下)金属(電子注入性金属と称する)、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが用いられる。
本発明の有機EL素子に係る支持基板(以下、基体、基板、基材、支持体等ともいう)としては、ガラス、プラスチック等の種類には特に限定はなく、また透明であっても不透明であってもよい。支持基板1側から光を取り出す場合には、支持基板1は透明であることが好ましい。
本発明の有機EL素子に適用可能な封止手段としては、例えば、封止部材と電極、支持基板とを接着剤で接着する方法を挙げることができる。
有機機能層を挟み支持基板と対向する側の封止膜、あるいは封止用フィルムの外側に、有機EL素子の機械的強度を高めるため、保護膜あるいは保護板を設けてもよい。特に、封止が封止膜により行われている場合には、その機械的強度は必ずしも高くないため、このような保護膜、保護板を設けることが好ましい。これに使用することができる材料としては、前記封止に用いたのと同様なガラス板、ポリマー板・フィルム、金属板・フィルム等を用いることができるが、軽量かつ薄膜化ということからポリマーフィルムを用いることが好ましい。
本発明の有機EL素子の製造方法の一例として、陽極/正孔注入層/正孔輸送層/発光層/電子輸送層/電子注入層/陰極からなる有機EL素子の製造方法を説明する。
本発明の有機EL素子は、表示デバイス、ディスプレイ、各種発光光源として用いることができる。
《有機EL素子6の作製》:本発明
(可撓性フィルムの作製)
可撓性フィルムとして、ポリエチレンナフタレートフィルム(帝人デュポン社製フィルム、以下、PENと略記する)を用いた。その可撓性フィルムの陽極を形成する側の前面に、特開2004-68143号公報に記載の構成からなる大気圧プラズマ放電処理装置を用いて、連続して、SiOxからなる無機物のガスバリア膜を厚さ500nmとなるように形成し、酸素透過度0.001cm3/(m2・24h・atm)以下、水蒸気透過度0.001g/(m2・24h)以下のガスバリア性の可撓性フィルムを作製した。
準備したガスバリア性の可撓性フィルム上に厚さ120nmのITO(インジウムチンオキシド)をスパッタ法により成膜し、フォトリソグラフィー法によりパターニングを行い、陽極を作製した。
パターニング後のITO基板をイソプロピルアルコールで超音波洗浄し、乾燥窒素ガスで乾燥し、UVオゾン洗浄を5分間行った。この基板上に、ポリ(3,4-エチレンジオキシチオフェン)-ポリスチレンスルホネート(PEDOT/PSSと略記、Bayer製、Baytron P Al 4083)を純水で70%に希釈した溶液を3000rpm、30秒でスピンコート法により製膜した。
この基板を、窒素ガス雰囲気下に移し、前記正孔輸送材料である例示化合物(60)(Mw=80,000)をクロロベンゼンに0.5%溶解した溶液を、1500rpm、30秒でスピンコート法により製膜し、130℃で30分間乾燥し、膜厚30nmの正孔輸送層とした。
次いで、下記組成の発光層組成物を1500rpm、30秒でスピンコート法によりそれぞれ製膜し、120℃で30分間乾燥し、膜厚40nmの発光層を形成した。
非発光性有機材料(a-6、a-41、a-31)
a-6 12.000質量部
a-41 1.970質量部
a-31 0.170質量部
なお、a-6、a-41、a-31はホスト化合物である。
D-66 2.450質量部
D-67 0.025質量部
D-80 0.025質量部
溶媒
トルエン 2,000質量部
(電子輸送層の作製)
続いて、20mgの化合物Aを、4mlのテトラフルオロプロパノール(TFPO)に溶解した溶液を、1500rpm、30秒でスピンコート法により製膜し、120℃で30分間乾燥し、膜厚30nmの電子輸送層とした。
続いて、基板(電子輸送層まで設けた作製途中の素子)を真空蒸着装置へ取り付けた。また、モリブデン製抵抗加熱ボートにフッ化カリウムを入れたものを真空蒸着装置に取り付け、真空槽を4×10-5Paまで減圧した後、前記ボートに通電して加熱してフッ化カリウムを0.02nm/秒で前記電子輸送層上に膜厚2nmの電子注入層を作製した。引き続き、アルミニウムを100nmを蒸着して陰極を形成した。
引き続き、市販のロールラミネート装置を用いて封止部材を接着し、有機EL素子6(本発明)を作製した。
(B)ジシアンジアミド(DICY)
(C)エポキシアダクト系硬化促進剤
以上のようにして、図1に記載の形態になるよう、封止基板を、取り出し電極及び電極リードの接合部を覆うようにして密着・配置して、圧着ロールを用いて圧着条件、圧着ロール温度120℃、圧力0.5MPa、装置速度0.3m/分で密着封止して、有機EL素子6(本発明)を作製した。
有機EL素子6の作製において、発光層を形成した際に非発光性有機材料及び発光性ドーパントが表1、表2及び表3のようになるように変えた以外は同様にして、有機EL素子1~5(比較例)、有機EL素子7~13(本発明)及び15~21(本発明)を各々作製した。
有機EL素子6の作製において、発光層を形成した際に発光層組成物が下記のように変えた以外は同様にして、有機EL素子14を作製した。
非発光性有機材料(a-6、a-10、a-12、a-17、a-24、a-26、a-30、a-31、a-33、a-41)
a-6 1.414質量部
a-10 1.414質量部
a-12 1.414質量部
a-17 1.414質量部
a-24 1.414質量部
a-26 1.414質量部
a-30 1.414質量部
a-31 1.414質量部
a-33 1.414質量部
a-41 1.414質量部
なお、a-6、a-10、a-12、a-17、a-24、a-26、a-30、a-31、a-33、a-41はホスト化合物である。
得られた有機EL素子1~5(比較例)、6~14(本発明)及び15~21(本発明)の各々について、下記の各評価を行った。
作製した有機EL素子に対し、2.5mA/cm2定電流を印加したときのパワー効率(lm/W)を測定した。なお、測定には分光放射輝度計CS-2000(コニカミノルタセンシング製)を用いた。
各有機EL素子を半径5cmの円柱に巻きつけ、素子を折り曲げた状態で連続駆動させ、分光放射輝度計CS-2000(コニカミノルタセンシング社製)を用いて輝度を測定し、測定した輝度が半減する時間(LT50)を求めた。
各有機EL素子を半径5cmの円柱に巻きつけ、折り曲げた状態で2.5mA/cm2時の電圧を測定した(初期状態)。
《有機EL素子23(本発明)の作製》:本発明
正孔輸送層から電子輸送層までを下述する蒸着法で成膜した以外は、実施例1の有機EL素子1~21と同様に作製した。
基板(正孔注入層まで設けた作製途中の素子)を真空蒸着装置へ取り付けた。また、モリブデン製抵抗加熱ボートにα-NPDを入れたものを真空蒸着装置に取り付け、真空槽を4×10-5Paまで減圧した後、前記ボートに通電して加熱してα-NPDを0.10nm/秒で前記正孔注入層上に膜厚20nmの正孔輸送層を作製した。
次いで、モリブデン製抵抗加熱ボートに下記発光層組成物1種につき1つのボートに入れたものをそれぞれ用意し、真空蒸着装置に取り付け、真空槽を4×10-5Paまで減圧した後、前記ボートに通電して加熱して共蒸着により、前記正孔輸送層上に膜厚20nmの発光層1を作製した。発光層組成物全体の蒸着レートは1.0nm/秒とした。
非発光性有機材料(a-6、a-31)
a-6 70.000質量部
a-31 20.000質量部
なお、a-6、a-31はホスト化合物である。
D-67 8.000質量部
D-80 2.000質量部
(発光層2の作製)
次いで、モリブデン製抵抗加熱ボートに下記発光層組成物1種につき1つのボートに入れたものをそれぞれ用意し、真空蒸着装置に取り付け、真空槽を4×10-5Paまで減圧した後、前記ボートに通電して加熱して共蒸着により、前記発光層1上に膜厚20nmの発光層2を作製した。発光層組成物全体の蒸着レートは1.0nm/秒とした。
非発光性有機材料(a-6、a-41)
a-41 70.000質量部
a-6 12.000質量部
なお、a-41はホスト化合物である。
D-66 18.000質量部
(電子輸送層の作製)
続いて、モリブデン製抵抗加熱ボートに化合物Aを入れたものを真空蒸着装置に取り付け、真空槽を4×10-5Paまで減圧した後、前記ボートに通電して加熱して化合物Aを0.10nm/秒で前記電子輸送層上に膜厚20nmの電子輸送層を作製した。
有機EL素子23の作製において、発光層を形成した際に発光層組成物が表5の記載のように変更した以外は同様にして、有機EL素子22、24及び25を各々作製した。
得られた有機EL素子22~25の評価は、実施例1の有機EL素子1~21と同様にして、パワー効率(効率)、連続駆動安定性(寿命)、高温保存安定性(高温保存時の電圧変化)を各々評価した。
2 陽極
3 正孔注入層
4 正孔輸送層
5 発光層
6 電子輸送層
7 電子注入層
8 陰極
9 封止接着剤
10 可撓性封止部材
Claims (7)
- 陽極、陰極間に少なくとも一層の発光層を有する有機エレクトロルミネッセンス素子において、
該発光層が、少なくとも1種の発光性ドーパントと少なくとも3種の下記一般式(2)で表される非発光性有機材料とを含有し、且つ、前記非発光性有機材料のうち分子量の一番大きいものが1500以下であり、且つ、前記非発光性有機材料の最小含有率が1質量%以上であることを特徴とする有機エレクトロルミネッセンス素子。
- 前記一般式(2)で表される非発光性有機材料が、5種以上含有されていることを特徴とする請求項1又は2に記載の有機エレクトロルミネッセンス素子。
- 前記一般式(2)で表される複数種の非発光性有機材料の分子量が大きい順に、含有量(質量%)が多いことを特徴とする請求項1~3のいずれか一項に記載の有機エレクトロルミネッセンス素子。
- 前記一般式(2)で表される非発光性有機材料のうち、一番大きい分子量M(max)と一番小さい分子量M(min)の差が、250未満であることを特徴とする請求項1~4のいずれか一項に記載の有機エレクトロルミネッセンス素子。
- 前記発光性ドーパントの少なくとも1つが、リン光発光性ドーパントであることを特徴とする請求項1~5のいずれか一項に記載の有機エレクトロルミネッセンス素子。
- 前記リン光発光性ドーパントが、下記一般式(1)で示されることを特徴とする請求項6に記載の有機エレクトロルミネッセンス素子。
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