WO2016136397A1 - 透明電極及び電子デバイス - Google Patents
透明電極及び電子デバイス Download PDFInfo
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- WO2016136397A1 WO2016136397A1 PCT/JP2016/052942 JP2016052942W WO2016136397A1 WO 2016136397 A1 WO2016136397 A1 WO 2016136397A1 JP 2016052942 W JP2016052942 W JP 2016052942W WO 2016136397 A1 WO2016136397 A1 WO 2016136397A1
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- WTGQALLALWYDJH-WYHSTMEOSA-N scopolamine hydrobromide Chemical compound Br.C1([C@@H](CO)C(=O)OC2C[C@@H]3N([C@H](C2)[C@@H]2[C@H]3O2)C)=CC=CC=C1 WTGQALLALWYDJH-WYHSTMEOSA-N 0.000 description 1
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- YRGLXIVYESZPLQ-UHFFFAOYSA-I tantalum pentafluoride Chemical compound F[Ta](F)(F)(F)F YRGLXIVYESZPLQ-UHFFFAOYSA-I 0.000 description 1
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 1
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- 150000004867 thiadiazoles Chemical class 0.000 description 1
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- IBBLKSWSCDAPIF-UHFFFAOYSA-N thiopyran Chemical compound S1C=CC=C=C1 IBBLKSWSCDAPIF-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
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- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/816—Multilayers, e.g. transparent multilayers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
- H05B33/28—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode of translucent electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
Definitions
- the present invention relates to a transparent electrode and an electronic device. More specifically, the present invention relates to a transparent electrode having both light transmittance and conductivity and an electronic device having the transparent electrode.
- Transparent electrodes are generally used for liquid crystal displays, electroluminescence displays, plasma displays, electrochromic displays, solar cells, touch panels, electronic paper, and the like.
- an organic EL element also referred to as an organic electroluminescent element
- electroluminescence of an organic compound Electro Luminescence: hereinafter abbreviated as “EL”
- the organic compound is contained between two opposing electrodes.
- the light emitting layer is arranged so that the emitted light generated in the light emitting layer passes through the electrode and is extracted outside. For this reason, at least one of the two electrodes is formed of a transparent electrode.
- the transparent electrode is usually formed by sputtering, and the transparent electrode formed only by the sputtering film formation method has a large surface resistance and a significant voltage drop from the feeding point.
- Patent Document 1 discloses a transparent electrode having a structure in which an ITO film and a silver film are laminated
- Patent Document 2 discloses a transparent electrode having a structure in which a silver film is sandwiched between ITO films.
- the silver film to be applied is thinned to such an extent that loss of transmittance does not occur, the resistance value does not sufficiently decrease, so that it must be used in combination with a metal oxide such as ITO.
- ITO uses rare metal indium, the material cost is high.
- silver when silver is applied, high electrical conductivity can be obtained, but on the other hand, there is a problem that there is a trade-off between resistance characteristics and transmittance as described above.
- the silver-aluminum alloy has a characteristic that aluminum is easily oxidized, and has a problem that the resistance value increases due to the oxidation.
- the present invention has been made in view of the above-mentioned problems and situations, and the solution is to provide a transparent electrode having both excellent light transmission and high conductivity, and this transparent electrode, with a low driving voltage.
- An electronic device having excellent color change stability is provided.
- the present inventor contains two kinds of organic compounds having a specific structure between the substrate and the conductive layer mainly composed of silver.
- the present inventors have found that a transparent electrode having both excellent light transmittance and high conductivity can be realized by a transparent electrode having an organic functional layer to achieve the present invention.
- a transparent electrode having a conductive layer containing at least silver as a main component on a substrate, Between the substrate and the conductive layer, at least a first organic compound having a structure represented by the following general formula (1) and a second organic compound having a structure different from that of the first organic compound A transparent electrode comprising an organic functional layer.
- R 1 to R 6 are each independently a hydrogen atom, a halogen atom, a cyano group, a nitro group, a sulfonyl group (—SO 2 R 7 ), a sulfinyl group (—SOR 7 ), a sulfonamide group (— SO 2 NR 7 R 8 ), sulfonate group (—SO 3 R 7 ), trifluoromethyl group, ester group (—COOR 7 ), amide group (—CONHR 7 or —CONR 7 R 8 ), carbon number 1 to 12
- R 7 and R 8 each independently represents an alkyl group having 1 to 60 carbon atoms, an aryl group, or a 5- to 7-membered heterocyclic group. ] 2.
- E 101 to E 108 each represent C (R 12 ) or a nitrogen atom, and at least one of E 101 to E 108 is a nitrogen atom.
- R 11 and R 12 each represent a hydrogen atom or a substituent.
- R 1 , R 2 and R 3 each independently represents a hydrogen atom or a substituent.
- L 1 represents an aromatic hydrocarbon ring group or an aromatic heterocyclic group bonded to a nitrogen atom.
- the transparent electrode according to item 1 or 2 wherein the first organic compound is a compound in which R 1 to R 6 in the general formula (1) are all cyano groups.
- An electronic device comprising the transparent electrode according to any one of items 1 to 4.
- the present invention it is possible to provide a transparent electrode having both excellent light transmittance and high conductivity, and an electronic device having excellent color change stability with a low driving voltage including the transparent electrode.
- the inventors of the present invention provide a first organic compound represented by the general formula (1) on the substrate or an optical adjustment layer including a metal oxide provided on the substrate as necessary, and the first A film having a high continuity by forming an organic functional layer containing a second organic compound having a structure different from that of the first organic compound, thereby forming a conductive layer mainly composed of silver on the organic functional layer. It was found that can be formed.
- each component is randomly arranged, that is, arranged in a uniform distribution state without being localized in the layer. Sex can be obtained. That is, by providing an organic functional layer containing the first organic compound represented by the general formula (1) and the second organic compound, the silver atom first has an atom having an affinity for the silver atom.
- a layer-growth type (Frank-van der Merwe: FM type) in which a two-dimensional nucleus is formed on the surface of an organic functional layer containing a silver affinity compound, and a two-dimensional single crystal layer is formed around it.
- a film is formed by film growth.
- the second organic compound is regularly arranged to some extent by the ordered arrangement of the first organic compound having the structure represented by the general formula (1), so that a portion having an affinity for silver can be efficiently surfaced. I guess that can be formed.
- Schematic sectional view showing an example of the configuration of the transparent electrode of the present invention Schematic sectional view showing another example of the configuration of the transparent electrode of the present invention
- the transparent electrode of the present invention is a transparent electrode having a conductive layer containing at least silver as a main component on a substrate, and is represented by at least the following general formula (1) between the substrate and the conductive layer. And an organic functional layer containing a second organic compound having a structure different from that of the first organic compound.
- This feature is a technical feature common to the inventions according to claims 1 to 6.
- the second organic compound contained in the organic functional layer is represented by the general formula (2) or the general formula (3) from the viewpoint that the effect intended by the present invention can be further expressed.
- the first organic compound represented by the general formula (1) it is possible to form a conductive layer having higher continuity and improved permeability. It is preferable from a viewpoint that can be made.
- the first organic compound is a compound in which R 1 to R 6 in the general formula (1) are all cyano groups (hereinafter sometimes abbreviated as HAT-CN).
- HAT-CN cyano groups
- optical adjustment layer containing a metal oxide or metal sulfide between the substrate and the organic functional layer can adjust optical characteristics such as reflectance and transmittance of the conductive layer, and as a transparent electrode, Furthermore, this is a preferred embodiment from the viewpoint of improving light transmittance.
- the transparent electrode of the present invention has sufficient light transmission and conductivity by applying it as a transparent electrode for an electronic device, for example, an organic electroluminescence element, and can drive the electronic device at a low voltage. In addition, color variation during light emission can be suppressed.
- ⁇ is used to mean that the numerical values described before and after it are included as the lower limit value and the upper limit value.
- FIG. 1 is a schematic sectional view showing an example (embodiment 1) of the configuration of the transparent electrode of the present invention.
- the transparent electrode (10) of this invention has the electroconductive layer (12) which has silver as a main component on a board
- FIGS. 2A and 2B are schematic sectional views showing another example (embodiment 2) of the configuration of the transparent electrode of the present invention.
- the transparent electrode (10) shown in FIG. 2A is an optical adjustment layer containing a metal oxide or a metal sulfide between the substrate (13) and the organic functional layer (11) in addition to the structure described in FIG. 2B, the transparent electrode (10) shown in FIG. 2B has a second electrode on the uppermost surface of the upper surface of the conductive layer (12) in addition to the configuration described in FIG. 2A. It is the structure which provided the optical adjustment layer (14B).
- the “main component” as used in the conductive layer (12) according to the present invention refers to the component having the highest constituent ratio among the components constituting the conductive layer (12) as the “main component”.
- “The main component of silver” in 12) means that the silver composition ratio is 51% by mass or more, preferably 60% by mass or more, more preferably 90% by mass or more, It is especially preferable that it is 98 mass% or more.
- transparent in the transparent electrode (10) of the present invention means that the light transmittance at a measurement light wavelength of 550 nm is 50% or more.
- the sheet resistance value as the transparent electrode (10) is preferably less than 8 ⁇ / ⁇
- the thickness of the conductive layer (12) is usually within a range of 5 to 20 nm, preferably 5 to 12 nm. It is set within the range.
- the substrate (13) constituting the transparent electrode (10) of the present invention include, but are not limited to, glass and plastic.
- the substrate (13) according to the present invention is a substrate (13) when the transparent electrode (10) of the present invention is used for an electronic device that extracts light from the substrate (13) side, for example, an organic electroluminescence element. ) Is preferably transparent.
- the transparent substrate (13) preferably used include glass, quartz, and a transparent resin film.
- the glass it is preferable to apply a thin film glass, and as the thin film glass, those formed by various forming methods can be used.
- a thin film glass formed by a rollout method, a redraw method, a downdraw method, a float method, or the like can be used.
- the average thickness of the thin film glass is preferably 5 to 200 ⁇ m, and more preferably 5 to 100 ⁇ m.
- the thin film glass is not particularly limited as long as it is a multicomponent oxide glass. Examples thereof include silica glass, soda lime silica glass, lead glass, borosilicate glass, and alkali-free glass. From the viewpoints of adhesion, durability, and smoothness to the organic functional layer (11) or the optical adjustment layer (14), the surface of these glass materials is subjected to physical treatment such as polishing as necessary. Alternatively, a film made of an inorganic material or an organic material, or a hybrid film combining these films may be formed.
- polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, cellulose diacetate, cellulose triacetate (TAC), cellulose acetate butyrate, cellulose acetate propionate ( CAP), cellulose esters such as cellulose acetate phthalate, 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 Cycloolefins such as polyetherimide, polyetherketoneimide, polyamide, fluororesin, nylon, polymethylmethacrylate, acrylic or polyarylate, arton (trade name, manufactured by JSR) or abortion (trade name,
- a film made of an inorganic material or an organic material or a hybrid film combining these films may be formed on the surface of the resin film described above.
- Such coatings and hybrid coatings have a water vapor permeability (25 ⁇ 0.5 ° C., relative humidity 90 ⁇ 2% RH) measured by a method according to JIS K 7129-1992, 0.01 g / m 2 ⁇ 24 h.
- the following gas barrier film also referred to as a gas barrier film or the like is preferable.
- the oxygen permeability measured by a method in accordance with JIS K 7126-1987 is 1 ⁇ 10 ⁇ 3 ml / m 2 ⁇ 24 h ⁇ atm or less, and the water vapor permeability is 1 ⁇ 10 ⁇ 5 g / m 2 ⁇ A high gas barrier film of 24 hours or less is preferable.
- the material for forming the gas barrier film as described above may be any material that has a function of suppressing the intrusion of factors that cause deterioration of electronic devices such as moisture and oxygen and organic EL elements, such as silicon oxide, Silicon dioxide, silicon nitride, or the like can be used. Furthermore, from the viewpoint of improving the brittleness of the gas barrier film, it is more preferable to have a laminated structure of a layer made of these inorganic materials (inorganic layer) and a layer made of an organic compound (organic layer). Although there is no restriction
- the method for producing the gas barrier film is not particularly limited.
- a plasma polymerization method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be appropriately selected and used.
- Organic functional layer is provided between the substrate and the conductive layer formed mainly of silver, and makes the metal atom arrangement in the conductive layer uniform, and achieves both light transmission and resistance characteristics. It is a layer for achieving, and contains at least a first organic compound represented by the general formula (1) whose details will be described later and a second organic compound having a structure different from that of the first organic compound. Furthermore, it is a preferable aspect that the second organic compound is a compound represented by the following general formula (2) or general formula (3).
- R 1 to R 6 are each independently a hydrogen atom, a halogen atom, a cyano group, a nitro group, a sulfonyl group (—SO 2 R 7 ), a sulfinyl group (—SOR 7 ), a sulfone Amide group (—SO 2 NR 7 R 8 ), sulfonate group (—SO 3 R 7 ), trifluoromethyl group, ester group (—COOR 7 ), amide group (—CONHR 7 or —CONR 7 R 8 ), carbon An alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aromatic hydrocarbon ring group, an arylamino group, a non-aromatic heterocyclic group, an aromatic heterocyclic group or an aralkylamino group.
- R 7 and R 8 each independently represents an alkyl group having 1 to 60 carbon atoms, an aryl group, or a 5- to 7
- R 1 to R 8 in the general formula (1) may each have a substituent, and examples of the substituent include a linear or branched alkyl group (for example, a methyl group, an ethyl group, a propyl group, an isopropyl group).
- substituents include a linear or branched alkyl group (for example, a methyl group, an ethyl group, a propyl group, an isopropyl group).
- Non-aromatic hydrocarbon ring group eg, cyclopentyl group, cyclohexyl group, etc.
- non-aromatic heterocyclic group eg, pyrrolidyl group, imidazolidyl group, morpholyl group, oxazolidyl group, etc.
- alkoxy group eg, methoxy group
- Ethoxy group propyloxy group
- cycloalkoxy group for example, cyclopentyloxy group, cyclohexyloxy group, etc.
- aryloxy group for example, phenoxy group
- alkylthio group eg, methyl
- acyl groups eg, acetyl group, ethylcarbonyl group, propylcarbonyl group, pentylcarbonyl group, cyclohexylcarbonyl group, octylcarbonyl group, 2-ethylhexylcarbonyl group, dodecylcarbonyl group, phenylcarbonyl group, naphthylcarbonyl group, pyridylcarbonyl group) Group), acyloxy group (for example, acetyloxy group, ethylcarbonyloxy group, butylcarbonyloxy group, octylcarbonyloxy group, dodecylcarbonyloxy group, phenylcarbonyloxy group, etc.), amide group (for example, methylcarbonylamino group, Ethylcarbonylamino group, dimethylcarbonylamino group, propylcarbonylamino group, pentylcarbonylamino group,
- the exemplified compound 1-1 in which all of R 1 to R 6 are cyano groups is particularly preferable.
- This exemplified compound 1-1 is called by the abbreviation HAT-CN.
- the compound represented by the general formula (1) can be easily synthesized according to a conventionally known synthesis method.
- the organic functional layer according to the present invention is characterized in that the second organic compound is used in combination with the first organic compound represented by the general formula (1) described above.
- a compound represented by the following general formula (2) or a compound having a structure represented by the general formula (3) is preferable.
- the second organic compound according to the present invention is preferably a compound having a structure represented by the following general formula (2) (hereinafter referred to as “compound represented by the general formula (2)”).
- E 101 to E 108 each represent C (R 12 ) or a nitrogen atom, and at least one of E 101 to E 108 is a nitrogen atom.
- R 11 and R 12 each represent a hydrogen atom or a substituent.
- substituents represented by R 11 and R 12 include alkyl groups (for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group, dodecyl group, Tridecyl group, tetradecyl group, pentadecyl group etc.), cycloalkyl group (eg cyclopentyl group, cyclohexyl group etc.), alkenyl group (eg vinyl group, allyl group etc.), alkynyl group (eg ethynyl group, propargyl group etc.) , Aromatic hydrocarbon groups (also referred to as aromatic carbocyclic groups, aryl groups, etc., for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, an
- substituents may be further substituted with the above substituents.
- a plurality of these substituents may be bonded to each other to form a ring.
- exemplified compounds represented by the general formula (2) exemplified compounds 2-1 to 2-3 and 2-12 are preferable.
- the compound represented by the general formula (2) can be easily synthesized according to a conventionally known synthesis method.
- the second organic compound according to the present invention is preferably a compound having a structure represented by the following general formula (3) (hereinafter referred to as “compound represented by the general formula (3)”).
- R 1 , R 2 and R 3 each independently represent a hydrogen atom or a substituent.
- L 1 represents an aromatic hydrocarbon ring group or an aromatic heterocyclic group bonded to a nitrogen atom.
- examples of the substituent represented by R 1 , R 2 and R 3 include an alkyl group (for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group).
- alkyl group for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group.
- cycloalkyl group eg cyclopentyl group, cyclohexyl group etc.
- alkenyl group eg vinyl group, allyl group etc.
- alkynyl group eg Ethynyl group, propargyl group, etc.
- aromatic hydrocarbon group aromatic carbocyclic group, aryl group, etc.
- aromatic heterocyclic group for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, an
- L 1 preferably has an aromatic six-membered ring skeleton.
- the aromatic six-membered ring skeleton includes, for example, an aromatic hydrocarbon group (also called 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 aromatic hydrocarbon group also called 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.
- L 1 has a benzene ring skeleton or a triazine ring skeleton.
- the aromatic six-membered ring skeleton, the benzene ring skeleton, and the triazine ring skeleton represent that each partial structure is included as in the above-described pyridine ring skeleton.
- the compound represented by the general formula (2) can be easily synthesized according to a conventionally known synthesis method.
- the organic functional layer according to the present invention contains the first organic compound represented by the general formula (1) and a second organic compound having a structure different from that of the first organic compound at the same time. Furthermore, the compound represented by the general formula (1) as the first organic compound and the compound represented by the general formula (2) or the general formula (3) as the second organic compound are used in combination. It is preferable.
- the ratio of the compound represented by the general formula (1) and the compound represented by the general formula (2) or the general formula (3) is not particularly limited, but the general formula ( 2)
- the use ratio of the compound represented by the general formula (1) may be in the range of 5.0 to 60% by mass. More preferably, it is in the range of 10 to 50% by mass.
- Formation method of organic functional layer Various thin film forming methods can be applied to the formation of the organic functional layer according to the present invention. Among them, it is preferable to form the organic functional layer by vapor deposition or sputtering.
- Deposition methods applicable to the present invention include resistance heating vapor deposition, electron beam vapor deposition, ion plating, and ion beam vapor deposition.
- the vapor deposition apparatus for example, a BMC-800T vapor deposition machine manufactured by SYNCHRON Co., Ltd. can be used. Two heating boats are used, and one heating boat is filled with the compound represented by the general formula (1). The other heating board is filled with the compound represented by the general formula (2) or the general formula (3), the heating condition is controlled so as to obtain a desired ratio, and the organic functional layer is formed by co-evaporation.
- a method can be mentioned.
- the sputtering method used to form the organic functional layer according to the present invention is a rare gas element (usually argon) or nitrogen ionized by applying a high voltage to a metal used for forming a thin film in a vacuum chamber as a target.
- This is a method of depositing a metal on a substrate with high density by causing a target (usually derived from air) to collide with a target and repelling atoms on the surface of the target.
- a metal oxide or metal nitride film can also be formed by introducing a reactive gas (O 2 or N 2 ) together with the rare gas.
- Sputtering methods applicable to the present invention include bipolar sputtering, magnetron sputtering, DC sputtering, DC pulse sputtering, RF (radio frequency) sputtering, dual magnetron sputtering, reactive sputtering, and ion beam sputtering.
- a known sputtering method such as a bias sputtering method and a facing target sputtering method can be used as appropriate.
- sputtering equipment examples include magnetron sputtering equipment manufactured by Osaka Vacuum Co., various types of sputtering equipment manufactured by ULVAC (for example, multi-chamber type sputtering equipment ENTRON TM -EX W300), and L-430S-FHS sputtering equipment manufactured by Anelva. Etc.
- the conductive layer (12) according to the present invention contains silver as a main component.
- the conductive layer (12) is a layer formed on the organic functional layer (11) described above.
- the conductive layer (12) is a layer composed mainly of silver, but may be composed of a plurality of layers as necessary.
- the layer thickness of the conductive layer (12) is preferably in the range of 5 to 20 nm, and more preferably in the range of 5 to 12 nm.
- the layer thickness is thinner than 20 nm, the absorption component or reflection component of the layer is reduced, and the light transmittance of the transparent electrode (10) is improved, which is preferable. Moreover, when the layer thickness is thicker than 5 nm, the conductivity as the conductive layer is sufficient, which is preferable.
- the transparent electrode (10) having a laminated structure composed of the organic functional layer (11) described above and the conductive layer (12) formed thereon the upper part of the conductive layer (12) is covered with a protective film. May be separated, or another conductive layer may be laminated. In this case, it is preferable that the protective film and another conductive layer have light transmittance so as not to impair the light transmittance of the transparent electrode (10).
- the transparent electrode (10) of the present invention the lower part of the organic functional layer (11), that is, between the organic functional layer (11) and the substrate (13), if necessary, the above-described FIG. It is good also as a structure which provided the optical adjustment layer (14) as shown in FIG. 2B.
- the conductive layer (12) may be composed of an alloy containing silver (Ag) as a main component.
- an alloy include silver-magnesium (Ag-Mg) and silver-copper (Ag). -Cu), silver-palladium (Ag-Pd), silver-palladium-copper (Ag-Pd-Cu), silver-indium (Ag-In), and the like.
- a method for forming the conductive layer (12) As a method for forming the conductive layer (12), a method using a wet process such as a coating method, an ink jet method, a coating method, a dip method, a vapor deposition method or a sputtering method used for forming the organic functional layer is applied. Among them, it is preferable to apply a vapor deposition method in the present invention.
- Deposition methods applicable to the present invention include resistance heating vapor deposition, electron beam vapor deposition, ion plating, and ion beam vapor deposition.
- As the vapor deposition apparatus for example, a BMC-800T vapor deposition machine manufactured by SYNCHRON Co., Ltd. can be used.
- the conductive layer (12) according to the present invention is formed on the organic functional layer (11) containing a specific compound, thereby forming the conductive layer (12) and then performing a high-temperature annealing treatment (for example, Although sufficient conductivity can be obtained without a heating process at 150 ° C. or higher, etc., a high temperature annealing treatment or the like may be performed after film formation, if necessary. At this time, it is important to set the glass transition temperature (Tg) of the base material constituting the transparent electrode.
- Tg glass transition temperature
- the transparent electrode (10) configured as described above, on the organic functional layer (11) containing the first organic compound represented by the general formula (1) and the second organic compound.
- a conductive layer (12) composed mainly of silver is provided on the organic functional layer (11).
- silver atoms contained in the conductive layer (12) are generally contained in the organic functional layer (11).
- the first organic compound represented by the formula (1) interacts with the second organic compound, the diffusion distance of silver atoms on the surface of the organic functional layer (11) is reduced, and aggregation of silver is suppressed.
- the thin film is grown in an island-like growth type (VW type), so that silver particles are easily isolated in an island shape.
- VW type island-like growth type
- the transparent electrode (10) of the configuration of the present invention since aggregation of silver is suppressed on the organic functional layer (11) as described above, the conductive layer (12) composed mainly of silver. In this film formation, a thin film is grown by a layer growth type (FM type).
- FM type layer growth type
- the optical adjustment layer (14) is a layer intended to adjust optical characteristics such as reflectance and transmittance of the conductive layer (12).
- Such an optical adjustment layer (14) is preferably a layer having a higher refractive index than the substrate (13), that is, a high refractive index layer.
- the refractive index of the high refractive index layer is preferably 1.8 or more, more preferably in the range of 2.1 to 2.5. When the refractive index of the high refractive index layer is higher than 1.8, the light transmittance of the conductive layer (12) is likely to increase.
- the refractive index of the high refractive index layer is preferably higher in the range of +0.1 to +1.1 and higher in the range of +0.4 to +1.0 than the refractive index of the substrate (13). preferable.
- the refractive index of the high refractive index layer in the present invention is a refractive index with respect to light having a wavelength of 510 nm, and is measured by an ellipsometer. The refractive index of the high refractive index layer can be adjusted by the material constituting the high refractive index layer, the density of the material in the high refractive index layer, and the like.
- the high refractive index layer is preferably configured to include a dielectric material or an oxide semiconductor material. Moreover, it is preferable that the material which comprises a high refractive index layer is a metal oxide or a metal sulfide.
- the high refractive index layer may include only one type of dielectric material or oxide semiconductor material, or may include two or more types.
- the numerical value represented by n in parentheses represents the refractive index.
- the layer thickness of the high refractive index layer is preferably in the range of 10 to 100 nm, more preferably in the range of 20 to 50 nm.
- the thickness of the high refractive index layer is 10 nm or more, the light transmittance of the conductive layer (12) can be sufficiently enhanced.
- the layer thickness of the high refractive index layer is 100 nm or less, the transparency (antireflection property) of the conductive layer (12) can be enhanced.
- the layer thickness of the high refractive index layer is measured with an ellipsometer.
- the optical adjustment layer (14) may be a layer having a refractive index lower than that of the substrate (13) (low refractive index layer).
- a low refractive index layer may be further provided, or a plurality of high refractive index layers and low refractive index layers may be stacked. By forming such a low refractive index layer adjacent to the high refractive index layer, the light transmittance of the transparent electrode (10) is further improved.
- the first optical adjustment layer (14A) is provided between the substrate (13) and the organic functional layer (11), and the second optical adjustment layer is further formed on the conductive layer (12).
- the optical adjustment layer (14B) may be provided.
- the first optical adjustment layer (14A) and the second optical adjustment layer (14B) may have the same configuration or different configurations.
- Examples of a method for forming the optical adjustment layer (14) described above on the substrate (11) include vapor deposition (resistance heating, EB method, etc.) or sputtering. Whether to apply the vapor deposition method or the sputtering method is preferably selected as appropriate depending on the type of metal oxide or metal sulfide to be used. For example, the vapor deposition method is preferably applied if the optical adjustment layer is formed using zinc oxide (ZnO), titanium oxide (TiO 2 ), or zinc sulfide (ZnS). In addition, a sputtering method is preferably applied if the optical adjustment layer is formed using indium oxide (In 2 O 3 ), indium tin oxide (ITO), or niobium oxide (Nb 2 O 5 ).
- vapor deposition resistance heating, EB method, etc.
- sputtering Whether to apply the vapor deposition method or the sputtering method is preferably selected as appropriate depending on the type of metal oxide or metal
- the transparent electrode of the present invention can be used for various electronic devices.
- electronic devices include organic EL elements, LEDs (Light Emitting Diodes), liquid crystal elements, solar cells, touch panels, etc.
- LEDs Light Emitting Diodes
- Transparent electrodes can be applied as electrode members that require light transmission in these electronic devices.
- FIG. 3 is a schematic cross-sectional view showing an example of an organic EL element (100) using the transparent electrode (10) of the present invention as an example of the electronic device of the present invention.
- the organic EL element (100) is provided on a transparent substrate (13, also referred to as a substrate hereinafter), and the transparent electrode (10 shown in FIG. 2A) is formed on the transparent substrate (13). ) Is arranged.
- An optical adjustment layer (14), an organic functional layer (11) and a conductive layer (12) are laminated on a transparent substrate which is a substrate (13) of a transparent electrode, and an organic light emitting layer unit ( 3) and the counter electrode (5a) are laminated.
- the organic EL element (100) a transparent electrode having a configuration defined in the present invention is used as the transparent electrode (10). For this reason, the organic EL element (100) is configured to extract the emitted light (L) generated from the light emitting point (h) at least from the light extraction surface (13a) side of the transparent substrate (13).
- FIG. 3 shows a configuration in which the transparent electrode (10) functions as an anode (that is, an anode) and the counter electrode (5a) functions as a cathode (that is, a cathode).
- the organic light emitting layer unit (3) includes the hole injection layer (3a) / hole transport layer (3b) / light emitting layer (3c) in this order from the transparent electrode (10) side that is the anode.
- the structure in which / electron transport layer (3d) / electron injection layer (3e) is laminated is illustrated, but it is essential to have a light emitting layer (3c) composed of at least an organic compound.
- the hole injection layer (3a) and the hole transport layer (3b) may be provided as a hole transport injection layer.
- the electron transport layer (3d) and the electron injection layer (3e) may be provided as an electron transport injection layer.
- the electron injection layer (3e) may be composed of an inorganic material.
- the organic light emitting layer unit (3) may have a hole blocking layer, an electron blocking layer, and the like stacked in necessary places in addition to these layers.
- the light emitting layer (3c) may have a structure in which each color light emitting layer for generating light emitted in each wavelength region is laminated, and each of these color light emitting layers is laminated via a non-light emitting auxiliary layer.
- the auxiliary layer may function as a hole blocking layer or an electron blocking layer.
- the counter electrode (5a) as the cathode may also have a laminated structure as necessary. In such a configuration, only the portion where the organic light emitting layer unit (3) is sandwiched between the transparent electrode (10) and the counter electrode (5a) becomes the light emitting region in the organic EL element (100).
- the auxiliary electrode (15) is in contact with the conductive layer (12) of the transparent electrode (10) for the purpose of reducing the resistance of the transparent electrode (10). It may be provided.
- the organic EL element (100) having the configuration shown in FIG. 3 will be described later on the transparent substrate (13) for the purpose of preventing the deterioration of the organic light emitting layer unit (3) formed using an organic compound or the like. It is sealed with a sealing material (17). This sealing material (17) is being fixed to the transparent substrate (13) side via the adhesive agent (19). However, the terminal portions of the transparent electrode (10) and the counter electrode (5a) are exposed from the sealing material (17) in a state in which they are insulated from each other by the organic light emitting layer unit (3) on the transparent substrate (13). It is assumed that it is provided.
- the details of the main layers for constituting the organic EL element (100) described above are described in the transparent substrate (13), the transparent electrode (10), the counter electrode (5a), and the light emitting layer of the organic light emitting layer unit (3) ( 3c), the other layers of the organic light emitting layer unit (3), the auxiliary electrode (15), and the sealing material (17) will be described in this order.
- the transparent substrate (13) is the substrate (13) constituting the transparent electrode (10) of the present invention described above with reference to FIGS. 1, 2A, and 2B. Of the substrates (13) described above, A transparent substrate (13) having optical transparency is used.
- the transparent electrode (10) is the transparent electrode (10) of the present invention described above, and the optical adjustment layer (14), the organic functional layer (11), and the conductive layer (12) in this order from the transparent substrate (13) side. Are sequentially formed.
- the transparent electrode (10) functions as an anode
- the conductive layer (12) is a substantial anode.
- the counter electrode (5a) is an electrode film that functions as a cathode for supplying electrons to the organic light emitting layer unit (3), and is composed of a metal, an alloy, an organic or inorganic conductive compound, or a mixture thereof. . Specifically, aluminum, silver, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, indium, lithium / aluminum mixture, rare earth metal, ITO, ZnO, TiO 2 , An oxide semiconductor such as SnO 2 can be given.
- the counter electrode (5a) can be produced by forming a thin film of these conductive materials by a method such as vapor deposition or sputtering.
- the sheet resistance value of the counter electrode (5a) is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected within the range of 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
- this organic EL element (100) takes the system which takes out emitted light (L) also from the counter electrode (5a) side, it has the favorable light transmittance selected from the electrically conductive material mentioned above.
- the counter electrode (5a) should just be comprised with the electroconductive material.
- the light emitting layer (3c) contains a light emitting material.
- a phosphorescent light emitting dopant also referred to as a phosphorescent light emitting material, a phosphorescent light emitting compound, or a phosphorescent compound
- the light emitting material It is preferable.
- the light emitting layer (3c) is a layer that emits light by recombination of electrons injected from the electrode or the electron transport layer (3d) and holes injected from the hole transport layer (3b), and emits light.
- the portion may be in the layer of the light emitting layer (3c) or the interface between the light emitting layer (3c) and the adjacent layer.
- Such a light emitting layer (3c) is not particularly limited in its configuration as long as the light emitting material contained satisfies the light emission requirements. Moreover, there may be a plurality of layers having the same emission spectrum and emission maximum wavelength. In this case, it is preferable to have a non-light emitting auxiliary layer (not shown) between the light emitting layers (3c).
- the total thickness of the light emitting layer (3c) is preferably in the range of 1 to 100 nm, and more preferably in the range of 1 to 30 nm because a lower driving voltage can be obtained.
- the sum total of the layer thickness of a light emitting layer (3c) is a layer thickness also including the said auxiliary layer, when a nonluminous auxiliary layer exists between light emitting layers (3c).
- each light emitting layer (3c) having a structure in which a plurality of layers are laminated
- the thickness of each light emitting layer (3c) is preferably adjusted within the range of 1 to 50 nm, and is adjusted within the range of 1 to 20 nm. It is more preferable.
- the plurality of stacked light emitting layers (3c) correspond to the respective emission colors of blue, green, and red, there are no particular restrictions on the relationship between the layer thicknesses of the blue, green, and red light emitting layers (3c). Absent.
- the light emitting layer (3c) configured as described above is formed by using a light emitting material or a host compound described later by a known thin film forming method such as a vacuum deposition method, a spin coating method, a casting method, an LB method, or an ink jet method. It can be formed by film formation.
- a known thin film forming method such as a vacuum deposition method, a spin coating method, a casting method, an LB method, or an ink jet method. It can be formed by film formation.
- the light emitting layer (3c) may be configured by mixing a plurality of light emitting materials, and a phosphorescent light emitting dopant (phosphorescent compound) and a fluorescent dopant (fluorescent light emitting material, fluorescent compound) are mixed. And may be configured.
- the light emitting layer (3c) contains a host compound (light emitting host) and a light emitting material (light emitting dopant), and it is preferable to make the light emitting material emit light more.
- the compound whose phosphorescence quantum yield of phosphorescence emission in room temperature (25 degreeC) is less than 0.1 is preferable. More preferably, the phosphorescence quantum yield is less than 0.01. Moreover, it is preferable that the volume ratio in the layer is 50% or more among the compounds contained in the light emitting layer 3c.
- a known host compound may be used alone, or a plurality of types may be used.
- a plurality of types of host compounds it is possible to adjust the movement of charges, and the organic EL element can be made highly efficient.
- a plurality of kinds of light emitting materials described later it is possible to mix different light emission, thereby obtaining an arbitrary light emission color.
- the host compound used may be a conventionally known low molecular compound, a high molecular compound having a repeating unit, or a low molecular compound having a polymerizable group such as a vinyl group or an epoxy group (evaporation polymerizable light emitting host). .
- a compound having a hole transporting ability and an electron transporting ability, which prevents emission of light from being increased in wavelength, and has a high Tg (glass transition temperature) is preferable.
- the glass transition temperature is a value determined by a method based on JIS K 7121-2012 using DSC (Differential Scanning Colorimetry).
- Luminescent material (1) Phosphorescence emission dopant As a luminescent material which can be used by this invention, a phosphorescence emission dopant is mentioned.
- a phosphorescent dopant is a compound in which light emission from an excited triplet is observed. Specifically, it is a compound that emits phosphorescence at room temperature (25 ° C.). Although defined as being a compound of 01 or more, a preferable phosphorescence quantum yield is 0.1 or more.
- the phosphorescent quantum yield can be measured by the method described in Spectroscopic 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 dopant in the present invention, the above phosphorescence quantum yield (0.01 or more) is achieved in any solvent. It only has to be done.
- the other is a carrier trap type in which the phosphorescent light emitting dopant becomes a carrier trap, and carrier recombination occurs on the phosphorescent light emitting dopant and light emission from the phosphorescent light emitting dopant is obtained.
- it is a condition that the excited state energy of the phosphorescent dopant is lower than the excited state energy of the host compound.
- the phosphorescent light-emitting dopant can be appropriately selected from known materials used for the light-emitting layer of a general organic EL device, and preferably contains a group 8-10 metal in the periodic table of elements.
- a complex compound more preferably an iridium compound, an osmium compound, a platinum compound (platinum complex compound), or a rare earth complex, and most preferably an iridium compound.
- At least one light emitting layer 3c may contain two or more phosphorescent light emitting dopants, and the concentration ratio of the phosphorescent light emitting dopant in the light emitting layer 3c varies in the thickness direction of the light emitting layer 3c. It may be.
- the phosphorescent light emitting dopant is preferably 0.1% by volume or more and less than 30% by volume with respect to the total amount of the light emitting layer 3c.
- preferable phosphorescent dopants include organometallic complexes having Ir as a central metal. More preferably, a complex containing at least one coordination mode among a metal-carbon bond, a metal-nitrogen bond, a metal-oxygen bond, and a metal-sulfur bond is preferable.
- Fluorescent dopant The fluorescent luminescent dopant (henceforth "fluorescent dopant") which concerns on this invention is demonstrated.
- the fluorescent dopant according to the present invention is a compound that can emit light from an excited singlet, and is not particularly limited as long as light emission from the excited singlet is observed.
- the fluorescent dopant according to the present invention includes coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, pyrylium dyes, perylene dyes. Stilbene dyes, polythiophene dyes, rare earth complex phosphors, and the like.
- luminescent dopants using delayed fluorescence have been developed, and these may be used.
- luminescent dopant using delayed fluorescence examples include, for example, compounds described in International Publication No. 2011/156793, Japanese Patent Application Laid-Open No. 2011-213643, Japanese Patent Application Laid-Open No. 2010-93181, and the like. Is not limited to these.
- injection layer hole injection layer, electron injection layer
- the injection layer is a layer provided between the electrode and the light emitting layer 3c in order to lower the driving voltage and improve the light emission luminance.
- the injection layer can be provided as necessary.
- hole injection layer (3a) The details of the hole injection layer (3a) are described in JP-A-9-45479, JP-A-9-260062, JP-A-8-288069 and the like, and a specific example is represented by copper phthalocyanine.
- Phthalocyanine layers oxide layers typified by vanadium oxide, amorphous carbon layers, polymer layers using conductive polymers such as polyaniline (emeraldine) and polythiophene, and the like.
- the details of the electron injection layer (3e) are also described in JP-A-6-325871, JP-A-9-17574, JP-A-10-74586, and the like. Specifically, representative examples thereof include strontium and aluminum. Metal layers, alkali metal halide layers typified by potassium fluoride, alkaline earth metal compound layers typified by magnesium fluoride, oxide layers typified by molybdenum oxide, and the like.
- the electron injection layer 3e is desirably a very thin film, and the layer thickness is preferably in the range of 1 nm to 10 ⁇ m although it depends on the material.
- the hole transport layer (3b) is made of a hole transport material having a function of transporting holes.
- the hole injection layer (3a) and the electron blocking layer are also included in the hole transport layer (3b).
- the hole transport layer (3b) can be provided as a single layer or a plurality of layers.
- the hole transport material has any of hole injection or transport and electron barrier properties, and may be either organic or inorganic.
- triazole derivatives oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives
- Examples thereof include stilbene derivatives, silazane derivatives, aniline copolymers, and conductive polymer oligomers, particularly thiophene oligomers.
- hole transport material those described above can be used, but it is preferable to use a porphyrin compound, an aromatic tertiary amine compound and a styrylamine 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 (abbreviation: 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 -Tolylaminophenyl) -4-phenylcyclohexane, bis (4-dimethylamino-2-methylphenyl) phenylmethane, bis (4-di-p
- 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.
- a so-called p-type hole transport material as described in 139 can also be used. In the present invention, it is preferable to use these materials because a light-emitting element with higher efficiency can be obtained.
- the hole transport layer (3b) 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 be formed.
- the layer thickness of the hole transport layer (3b) is not particularly limited, but is usually about 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
- the hole transport layer (3b) may have a single layer structure composed of one or more of the above materials.
- the electron transport layer (3d) is made of a material having a function of transporting electrons, and in a broad sense, the electron injection layer (3e) and the hole blocking layer are also included in the electron transport layer (3d).
- the electron transport layer (3d) can be provided as a single layer structure or a multilayer structure of a plurality of layers.
- the electron transport material (also serving as a hole blocking material) constituting the layer portion adjacent to the light emitting layer (3c) ) As long as it has a function of transmitting electrons injected from the cathode to the light emitting layer (3c).
- the electron transport material also serving as a hole blocking material constituting the layer portion adjacent to the light emitting layer (3c) )
- any one of conventionally known compounds can be selected and used.
- Examples include nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane, anthrone derivatives, and oxadiazole derivatives.
- a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group are also used as the material for the electron transport layer (3d).
- a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
- metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum (abbreviation: Alq 3 ), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8- Quinolinol) aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (abbreviation: Znq), etc., and the central metal of these metal complexes
- a metal complex in which In, Mg, Cu, Ca, Sn, Ga, or Pb is substituted can also be used as the material for the electron transport layer (3d).
- 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 material for the electron transport layer (3d).
- the distyrylpyrazine derivative used also as a material of a light emitting layer (3c) can also be used as a material of an electron carrying layer (3d), and is the same as that of a positive hole injection layer (3a) and a positive hole transport layer (3b).
- inorganic semiconductors such as n-type-Si and n-type-SiC can also be used as the material for the electron transport layer (3d).
- the electron transport layer (3d) can be formed by thinning the above 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. it can.
- the layer thickness of the electron transport layer (3d) is not particularly limited, but is usually about 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
- the electron transport layer (3d) may have a single layer structure composed of one or more of the above materials.
- the electron transport layer (3d) can be doped with impurities to increase the n property.
- 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 potassium compound for example, potassium fluoride can be used.
- the material (electron transporting compound) of the electron transport layer (3d) the same material as that constituting the organic functional layer (11) according to the present invention described above may be used. The same applies to the electron transport layer (3d) that also serves as the electron injection layer (3e).
- the blocking layer is provided as necessary in addition to the basic constituent layer of the organic light emitting layer unit (3) described above. For example, it is described in JP-A Nos. 11-204258 and 11-204359, and “Organic EL elements and the forefront of industrialization (published by NTT Corporation on November 30, 1998)” on page 237. There is a hole blocking (hole blocking) layer.
- the hole blocking layer has a function of an electron transport layer (3d) in a broad sense.
- the hole blocking layer is made of a hole blocking material that has a function of transporting electrons but has a very small ability to transport holes, and recombines electrons and holes by blocking holes while transporting electrons. Probability can be improved.
- the structure of said electron carrying layer (3d) can be used as a hole-blocking layer as needed.
- the hole blocking layer is preferably provided adjacent to the light emitting layer (3c).
- the electron blocking layer has a function of a hole transport layer (3b) in a broad sense.
- the electron blocking layer is made of a material that has a function of transporting holes but has a very small ability to transport electrons, and improves the probability of recombination of electrons and holes by blocking electrons while transporting holes. be able to.
- the structure of said positive hole transport layer (3b) can be used as an electron blocking layer as needed.
- the layer thickness of the hole blocking layer is preferably in the range of 3 to 100 nm, and more preferably in the range of 5 to 30 nm.
- the auxiliary electrode (15) is provided for the purpose of reducing the resistance of the transparent electrode (10), and is provided in contact with the conductive layer (12) of the transparent electrode (10).
- a metal having low resistance such as gold, platinum, silver, copper, and aluminum, is preferable. Since these metals have low light transmittance, a pattern is formed in a range not affected by extraction of the emitted light (h) from the light extraction surface (13a).
- Examples of a method for producing such an auxiliary electrode (15) include a vapor deposition method, a sputtering method, a printing method, an ink jet method, and an aerosol jet method.
- the line width of the auxiliary electrode 15 is preferably 50 ⁇ m or less from the viewpoint of the aperture ratio for extracting light, and the thickness of the auxiliary electrode 15 is preferably 1 ⁇ m or more from the viewpoint of conductivity.
- the sealing material (17) covers the organic EL element (100), is a plate-shaped (film-shaped) sealing member, and is fixed to the transparent substrate (13) side by an adhesive (19). It may be a thing or a sealing film.
- a sealing material (17) is at least an organic light emitting layer in a state where the transparent electrode (10) in the organic EL element (100), particularly the terminal portions of the conductive layer (12) and the counter electrode (5a) are exposed. It is provided so as to cover the unit (3).
- an electrode may be provided in the sealing material (17) so that the transparent electrode (10) of the organic EL element (100) and the terminal portion of the counter electrode (5a) are electrically connected to the electrode. .
- the plate-like (film-like) sealing material (17) include a glass substrate, a polymer substrate, a metal substrate, and the like, and these substrate materials may be used in the form of a thin film.
- the glass substrate include soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz.
- the polymer substrate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polysulfone.
- the metal substrate 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, silicon, germanium, and tantalum.
- the organic EL element can be thinned, a polymer substrate or a metal substrate formed into a thin film can be preferably used as the sealing material.
- the polymer substrate in the form of a film has an oxygen permeability measured by a method according to JIS K 7126-1987 of 1 ⁇ 10 ⁇ 3 ml / m 2 ⁇ 24 h ⁇ atm or less, and JIS K 7129-1992.
- the water vapor permeability (25 ⁇ 0.5 ° C., relative humidity (90 ⁇ 2)% RH) measured by a compliant method is preferably 1 ⁇ 10 ⁇ 3 g / m 2 ⁇ 24 h or less.
- the substrate material as described above may be processed into a concave plate shape and used as a sealing material (17).
- the above-described substrate material is subjected to processing such as sandblasting and chemical etching to form a concave shape.
- the adhesive (19) for fixing such a plate-shaped sealing material (17) to the transparent substrate (13) side is sandwiched between the sealing material (17) and the transparent substrate (13).
- the adhesive (19) is a photocuring and thermosetting adhesive having a reactive vinyl group of an acrylic acid oligomer or a methacrylic acid oligomer, or moisture curing such as 2-cyanoacrylate. Examples thereof include an adhesive such as a mold.
- epoxy-based heat and chemical curing type two-component mixing
- the adhesive (19) is preferably one that can be adhesively cured from room temperature (25 ° C.) to 80 ° C. Further, a desiccant may be dispersed in the adhesive (19).
- coating of the adhesive agent (19) to the adhesion part of a sealing material (17) and a transparent substrate (13) may use commercially available dispenser, and may print it like screen printing.
- this gap when a gap is formed between the plate-shaped sealing material (17), the transparent substrate (13), and the adhesive (19), this gap includes nitrogen, argon, etc. in the gas phase and the liquid phase. It is preferable to inject an inert liquid such as an inert gas, a fluorinated hydrocarbon, or silicon oil. A vacuum can also be used. 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.
- the sealing material (17) when a sealing film is used as the sealing material (17), the organic light emitting layer unit (3) in the organic EL element (100) is completely covered, and the transparent electrode (10) and the counter electrode in the organic EL element (100) are opposed to each other.
- a sealing film is provided on the transparent substrate (13) with the terminal portion of the electrode (5a) exposed.
- Such a sealing film is composed of an inorganic material or an organic compound.
- it is made of a material having a function of suppressing entry of a substance that causes deterioration of the organic light emitting layer unit (3) in the organic EL element (100) such as moisture and oxygen.
- a material for example, inorganic materials such as silicon oxide, silicon dioxide, and silicon nitride are used.
- a laminated structure may be formed using a film made of an organic compound together with a film made of these inorganic materials.
- the method for producing these films is not particularly limited.
- a polymerization method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be used.
- a protective film or a protective plate may be provided so as to sandwich the organic EL element (100) and the sealing material (17) together with the transparent substrate (13).
- This protective film or protective plate is for mechanically protecting the organic EL element (100), and particularly when the sealing material (17) is a sealing film, the organic EL element (100). Therefore, it is preferable to provide such a protective film or a protective plate.
- a glass plate, a polymer plate, a thinner polymer film, a metal plate, a thinner metal film, a polymer material film or a metal material film is applied.
- a polymer film because it is lightweight and thin.
- an optical adjustment layer (14) containing a metal oxide or metal sulfide is formed on a transparent substrate (13) with a layer thickness of 10 to 100 nm by a vacuum deposition method or a sputtering method.
- the organic functional layer (11) containing the first organic compound represented by (1) and the second organic compound is preferably formed by a method such as vapor deposition so as to have a layer thickness of 10 to 100 nm.
- the conductive layer (12) mainly composed of silver (or an alloy containing silver) is deposited by vapor deposition or the like so as to have a layer thickness within a range of 5 to 20 nm, preferably within a range of 8 to 12 nm.
- a unit of the transparent electrode (10) which is formed on the organic functional layer (11) by the method and becomes an anode is produced.
- a hole injection layer (3a), a hole transport layer (3b), a light emitting layer (3c), an electron transport layer (3d), and an electron injection layer (3e) are formed in this order on the organic light emitting layer.
- a unit (3) is formed.
- a spin coat method, a cast method, an ink jet method, a vapor deposition method, a printing method, or the like can be applied to the film formation of each of these layers. However, it is easy to obtain a homogeneous film and a pinhole is not easily generated. From the point of view, a vacuum deposition method or a spin coating method is particularly preferable. Further, a different film formation method may be applied to each layer to be formed.
- the vapor deposition conditions vary depending on the type of compound used, but generally the boat heating temperature is in the range of 50 to 450 ° C., and the degree of vacuum is 1 ⁇ 10 ⁇ 6. Within a range of ⁇ 1 ⁇ 10 ⁇ 2 Pa, a deposition rate within a range of 0.01 to 50 nm / second, a substrate temperature within a range of ⁇ 50 to 300 ° C., and a layer thickness of 0.1 to 5 ⁇ m Of these, it is desirable to select each condition as appropriate.
- a counter electrode (5a) serving as a cathode is formed thereon by an appropriate film forming method such as vapor deposition or sputtering.
- the counter electrode (5a) has a terminal portion on the periphery of the transparent substrate (13) from above the organic functional layer 3 while maintaining an insulating state with respect to the transparent electrode (10) by the organic light emitting layer unit (3).
- a pattern is formed in the drawn shape.
- an organic EL element (100) is obtained.
- a sealing material (17) covering at least the organic light emitting layer unit (3) is provided in a state where the terminal portions of the transparent electrode (10) and the counter electrode (5a) in the organic EL element (100) are exposed. .
- a desired organic EL element can be formed on the transparent substrate (13).
- the organic light emitting layer unit (3) it is preferable to produce the organic light emitting layer unit (3) to the counter electrode (5a) consistently by a single evacuation. You may take out a board
- the transparent electrode 1 as an anode has a positive polarity
- the counter electrode 5a as a cathode has a negative polarity
- a voltage of 2 to Luminescence can be observed when about 40 V is applied.
- An alternating voltage may be applied.
- the alternating current waveform to be applied may be arbitrary.
- the transparent electrode (10) having both light transmittance and conductivity according to the present invention is used as an anode, and the organic light emitting layer unit (3) is formed thereon.
- a counter electrode (5a) serving as a cathode serving as a cathode. Therefore, a sufficient voltage is applied between the transparent electrode (10) and the counter electrode (5a) to realize high-luminance light emission in the organic EL element (100), while emitting light from the transparent electrode 1 side ( It is possible to increase the luminance by improving the extraction efficiency of L). Further, it is possible to improve the light emission life by reducing the drive voltage for obtaining a predetermined luminance.
- FIG. 4 is a schematic cross-sectional view showing an embodiment 2 of an organic EL element using the above-described transparent electrode (10) as an example of the electronic device of the present invention.
- the organic EL element (200) of Embodiment 2 shown in FIG. 4 is different from the organic EL element (100) of Embodiment 1 shown in FIG. 3 in that the transparent electrode (10) is used as a cathode.
- the organic EL element (200) is provided on the transparent substrate (13), and as described in the first embodiment, the organic EL element (200) was previously described as the transparent electrode (10) on the transparent substrate (13).
- the transparent electrode (10) of the present invention is used.
- the organic EL element (200) is configured to extract emitted light (L) from at least the transparent substrate (13) side.
- this transparent electrode (10) is used as a cathode (cathode).
- the counter electrode (5b) is used as an anode.
- the layer structure of the organic EL element (200) configured as described above is not limited to the example described below, and may be a general layer structure as in the first embodiment. .
- an electron injection layer (3e) / electron transport layer (3d) / light emitting layer (3c) / hole transport layer (3b) are formed on the transparent electrode (10) functioning as a cathode.
- the structure of the organic light emitting layer unit (3) in which the / hole injection layer (3a) is laminated in this order is exemplified. However, it is essential to have at least a light emitting layer (3c) composed of an organic compound.
- the organic light emitting layer unit (3) adopts various configurations as necessary in the same manner as described in the first embodiment. In such a configuration, only the portion where the organic light emitting layer unit (3) is sandwiched between the transparent electrode (10) and the counter electrode (5b) may be a light emitting region in the organic EL element (200). It is the same.
- the auxiliary electrode (15) is provided in contact with the conductive layer (12) of the transparent electrode (10) for the purpose of reducing the resistance of the transparent electrode (10). This may be the same as in the first embodiment.
- the counter electrode (5b) used as the anode is composed of a metal, an alloy, an organic or inorganic conductive compound, or a mixture thereof.
- metals such as gold (Au), oxide semiconductors such as copper iodide (CuI), ITO, ZnO, TiO 2 , and SnO 2 .
- the counter electrode (5b) configured as described above can be produced by forming a thin film from these conductive materials by a method such as vapor deposition or sputtering.
- the sheet resistance value as the counter electrode 5b is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected within a range of 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
- this organic EL element (200) is comprised so that emitted light (L) can be taken out also from a counter electrode (5b) side, as a material which comprises a counter electrode (5b), it is the electroconductivity mentioned above.
- a conductive material having good light transmittance is selected and used.
- the organic EL element (200) having the above-described configuration is sealed with a sealing material (17) in the same manner as in Embodiment 1 for the purpose of preventing deterioration of the organic light emitting layer unit (3).
- the transparent electrode (10) having both light transmittance and conductivity of the present invention is used as a cathode, and the organic light emitting layer unit (3) and the counter electrode serving as an anode are formed thereon. (5b) is provided.
- a sufficient voltage is applied between the transparent electrode (10) and the counter electrode (5b) to realize high-luminance light emission in the organic EL element (200), while the transparent electrode (10) It is possible to increase the luminance by improving the extraction efficiency of the emitted light (h) from the side. Further, it is possible to improve the light emission life by reducing the drive voltage for obtaining a predetermined luminance.
- the organic EL element which is an example of the electronic device described above is a surface light emitter, it can be used as various light sources.
- lighting devices such as home lighting and interior lighting, backlights for watches and liquid crystals, lighting for billboard advertisements, light sources for traffic lights, light sources for optical storage media, light sources for electrophotographic copying machines, light sources for optical communication processors, Examples include a light source of an optical sensor.
- it can be effectively used for a backlight of a liquid crystal display device combined with a color filter and a light source for illumination.
- the organic EL element may be used as a kind of lamp for illumination or an exposure light source, a projection device that projects an image, or a display device that directly recognizes a still image or a moving image ( It may be used as a display.
- the light emitting surface may be enlarged by so-called tiling, in which light emitting panels provided with organic EL elements are joined together in a plane.
- the drive method when used as a display device for moving image reproduction may be either a simple matrix (passive matrix) method or an active matrix method.
- a color or full-color display device can be manufactured by using two or more organic EL elements of the present invention having different emission colors.
- the lighting device according to the present invention can include the organic EL element.
- the organic EL element used in the lighting device according to the present invention may be designed such that each organic EL element having the above-described configuration has a resonator structure.
- the purpose of use of the organic EL element configured to have a resonator structure includes a light source of an optical storage medium, a light source of an electrophotographic copying machine, a light source of an optical communication processor, a light source of an optical sensor, etc. It is not limited to. Moreover, you may use for the said use by making a laser oscillation.
- the material used for the organic EL element of this invention is applicable to the organic EL element (white organic EL element) which produces substantially white light emission.
- a plurality of luminescent colors can be simultaneously emitted by a plurality of luminescent materials, and white light emission can be obtained by mixing colors.
- white light emission colors those containing the three emission maximum wavelengths of the three primary colors of red, green and blue may be used, or two emission using the complementary colors such as blue and yellow, blue green and orange, etc. It may contain a maximum wavelength.
- a combination of light emitting materials for obtaining a plurality of emission colors is a combination of a plurality of phosphorescent or fluorescent materials, a light emitting material that emits fluorescence or phosphorescence, and excitation of light from the light emitting materials. Any combination with a pigment material that emits light as light may be used, but in a white organic EL element, a combination of a plurality of light-emitting dopants may be used.
- Such a white organic EL element is different from a configuration in which organic EL elements emitting each color are individually arranged in parallel to obtain white light emission, and the organic EL element itself emits white light. For this reason, a mask is not required for film formation of most layers constituting the element, and deposition can be performed on one side by vapor deposition, casting, spin coating, ink jet, printing, etc., and productivity is also improved. To do.
- Example 1 Preparation of transparent electrode >> As described below, the transparent electrodes 101 to 121 were prepared so that the area of the conductive region was 5 cm ⁇ 5 cm.
- a transparent non-alkali glass substrate (thickness: 0.5 ⁇ m, simply described as glass in Tables 1 and 2) is fixed in a BMC-800T vapor deposition device manufactured by Shincron, which is a vacuum vapor deposition device, and vacuumed. It attached to the vacuum chamber of the vapor deposition apparatus. Next, a resistance heating boat made of tungsten was filled with silver (Ag), and this was installed in the vacuum chamber. Next, after reducing the vacuum chamber to 4 ⁇ 10 ⁇ 4 Pa, the resistance heating boat is energized and heated, and the layer thickness is set on the substrate within the range of the deposition rate of 0.1 to 0.2 nm / second. A conductive layer 1 made of 10 nm silver was deposited to produce a transparent electrode 1 having a single layer structure.
- a transparent electrode 4 was produced in the same manner except that the optical adjustment layer 1 was formed between the substrate and the conductive layer 1 according to the following vacuum deposition method.
- optical adjustment layer 1 (Formation of optical adjustment layer 1) A BMC-800T vapor deposition device manufactured by SYNCHRON Co., Ltd. was used as a vacuum vapor deposition device, TiO 2 was loaded into a tungsten resistance heating boat, the vacuum chamber was depressurized to 1 ⁇ 10 ⁇ 4 Pa, and then the resistance heating boat was energized and heated. Then, the current heating condition of the resistance heating boat was adjusted, and vapor deposition was performed under the condition of a formation rate of 2.0 nm / second to form the optical adjustment layer 1 composed of TiO 2 having a layer thickness of 30 nm.
- a transparent electrode 5 was produced in the same manner except that the optical adjustment layer 2 was formed between the substrate and the conductive layer 1 according to the following sputtering method.
- optical adjustment layer 2 (Formation of optical adjustment layer 2) Using an Anelva L-430S-FHS sputtering apparatus, Ar: 20 sccm, O 2 : 5 sccm, sputtering pressure: 0.25 Pa, room temperature (25 ° C.), formation rate: 0.74 K / sec, and layer thickness of 30 nm Nb 2 O 5 was subjected to RC sputtering so that the optical adjustment layer 2 was formed. The target-substrate distance was 86 mm.
- the optical adjustment layer 3 was formed by sputtering using ITO (indium tin oxide) instead of Nb 2 O 5 as a material for forming the optical adjustment layer.
- ITO indium tin oxide
- IZO indium zinc oxide
- Nb 2 O 5 the material for forming the optical adjustment layer
- the optical adjustment layer 4 having a layer thickness of 30 nm was formed by sputtering.
- a transparent electrode 7 was produced in the same manner except for the above.
- a transparent electrode is formed in the same manner except that the optical adjustment layer is made of ZnO instead of TiO 2 and the vacuum adjustment method is used to form the optical adjustment layer 5 having a layer thickness of 30 nm. 8 was produced.
- a transparent electrode is formed in the same manner except that the optical adjustment layer is made of ZnS instead of TiO 2 and the optical adjustment layer 6 having a layer thickness of 30 nm is formed by vacuum deposition. 9 was produced.
- the transparent electrode 10 was produced in the same manner except that the organic functional layer 1 having a layer thickness of 15 nm was formed between the substrate and the conductive layer 1 according to the following vacuum deposition method.
- the material thickness of the organic functional layer was changed by the vacuum deposition method in the same manner except that the material for forming the organic functional layer was changed to each exemplified compound shown in Table 1 instead of the exemplified compound (1-1).
- the transparent electrodes 11 to 15 were prepared by forming optical adjustment layers 2 to 6 having a thickness of 15 nm.
- a transparent electrode 16 was produced in the same manner as the organic functional layer except that the organic functional layer 7 having a layer thickness of 15 nm was formed by the following co-evaporation method.
- Formation of organic functional layer 7 As a vacuum deposition apparatus, a BMC-800T deposition apparatus manufactured by SYNCHRON Co., Ltd. is used, and two tungsten resistance heating boats are arranged. One tungsten resistance heating boat is a compound represented by the general formula (1). The exemplified compound (1-1) was loaded, and the other tungsten resistance heating boat was loaded with the exemplified compound (2-2) which is a compound represented by the general formula (2).
- transparent electrodes 17 to 20 In the production of the transparent electrode 16, organic functional layers 8 to 11 having a layer thickness of 15 nm were formed by co-vacuum deposition in the same manner except that the formation material of the organic functional layer was changed to the combination shown in Table 1. Thus, transparent electrodes 17 to 20 were produced.
- transparent electrodes 21 and 22 In the production of the transparent electrode 16, transparent electrodes 21 and 22 were produced in the same manner except that the substrate was changed from glass to PET and PEN, respectively.
- transparent electrodes 23 and 24 In the production of the transparent electrode 19, transparent electrodes 23 and 24 were produced in the same manner except that the substrate was changed from glass to PET and PEN, respectively.
- the organic functional layers 14 to 28 having a layer thickness of 15 nm are formed by co-vacuum deposition in the same manner except that the material for forming the organic functional layer is changed to the combination shown in Tables 1 and 2. To form transparent electrodes 25 to 39.
- transparent electrodes 40 to 45 In the production of the transparent electrodes 4 to 9, transparent electrodes 40 to 45 were produced in the same manner except that the organic functional layer 7 was provided between the optical adjustment layers 1 to 6 and the conductive layer 1, respectively. .
- transparent electrodes 46 to 51 In the production of the transparent electrodes 4 to 9, transparent electrodes 46 to 51 were produced in the same manner except that the organic functional layer 10 was provided between the optical adjustment layers 1 to 6 and the conductive layer 1, respectively. .
- a transparent electrode 52 was produced in the same manner except that the following conductive layer 2 was formed instead of the conductive layer 1.
- Formation of conductive layer 2 As a vacuum evaporation system, a BMC-800T evaporation system manufactured by SYNCHRON Co., Ltd. was used, and two tungsten resistance heating boats were arranged. One tungsten resistance heating boat was loaded with Ag and the other resistance heating boat made of tungsten. Was loaded with Pd.
- a transparent electrode 53 was produced in the same manner except that the following conductive layer 3 was formed instead of the conductive layer 1.
- conductive layer 3 As a vacuum evaporation system, a BMC-800T evaporation system manufactured by SYNCHRON Co., Ltd. was used, and two tungsten resistance heating boats were arranged. One tungsten resistance heating boat was loaded with Ag and the other resistance heating boat made of tungsten. Was loaded with Au.
- a transparent electrode 54 was produced in the same manner except that the following conductive layer 4 was formed instead of the conductive layer 1.
- conductive layer 4 (Formation of conductive layer 4) As a vacuum evaporation system, a BMC-800T evaporation system manufactured by SYNCHRON Co., Ltd. was used, and two tungsten resistance heating boats were arranged. One tungsten resistance heating boat was loaded with Ag and the other resistance heating boat made of tungsten. Was loaded with Cu.
- the sheet resistance value ( ⁇ / ⁇ ) was measured by a four-probe method constant current application method using a resistivity meter (MCP-T610 manufactured by Mitsubishi Chemical Analytech Co., Ltd.).
- Table 1 and Table 2 show the results obtained as described above.
- the transparent electrode having the structure defined in the present invention has excellent light transmission and resistance characteristics compared to the comparative example, and is compatible with both. You can see that it plays.
- Example 2 Production of organic EL devices >> [Production of Organic EL Device 1] Using the transparent electrode 1 produced in Example 1 as an anode, an organic EL device 1 was produced according to the following method.
- the transparent electrode 1 produced in Example 1 was fixed to a substrate holder of a commercially available vacuum vapor deposition apparatus, and a vapor deposition mask was disposed facing the formation surface side of the transparent electrode 10. Moreover, each material which comprises an organic light emitting layer unit (3) was filled with the optimal quantity for film-forming of each layer in each heating boat in a vacuum evaporation system. In addition, what was produced with the resistance heating material made from tungsten was used for the heating boat.
- each layer was formed as follows by sequentially energizing and heating a heating boat containing each material.
- an ⁇ -NPD (4,4′-Bis [phenyl (1-naphthyl) amino] -1,1′-biphenyl) as a hole transport injection material is energized and heated, and ⁇ -NPD
- a hole transport injection layer serving as both a hole injection layer and a hole transport layer was formed on the conductive layer (12) constituting the transparent electrode 1.
- the deposition rate was 0.1 to 0.2 nm / second, and the layer thickness was 20 nm.
- the heating boat containing the host material H4 and the heating boat containing the phosphorescent dopant Ir-4 are energized independently, and the light emitting layer containing the host material H4 and the phosphorescent dopant Ir-4 ( 3c) was deposited on the hole transport injection layer.
- the layer thickness was 30 nm.
- a hole blocking layer made of BAlq is heated by energizing a heating boat containing BAlq ([Bis (2-methyl-8-quinolinolate) -4- (phenylphenolato) aluminum]) as a hole blocking material.
- BAlq [Bis (2-methyl-8-quinolinolate) -4- (phenylphenolato) aluminum]
- a film was formed on the light emitting layer (3c). At this time, the deposition rate was 0.1 to 0.2 nm / second, and the layer thickness was 10 nm.
- a heating boat containing ET-6 shown below as an electron transporting material and a heating boat containing potassium fluoride were energized independently, and an electron transporting layer containing ET-6 and potassium fluoride ( 3d) was deposited on the hole blocking layer.
- the layer thickness was 30 nm.
- a heating boat containing potassium fluoride as an electron injection material was energized and heated to form an electron injection layer (3e) made of potassium fluoride on the electron transport layer (3d).
- the deposition rate was 0.01 to 0.02 nm / second, and the layer thickness was 1 nm.
- the transparent substrate 1 formed up to the electron injection layer (3e) is transferred from the vapor deposition chamber of the vacuum vapor deposition apparatus to the processing chamber of the sputtering apparatus to which an ITO target is attached as a counter electrode material while maintaining the vacuum state. did. Then, in the processing chamber, a film was formed at a film formation rate of 0.3 to 0.5 nm / second, and a light-transmitting counter electrode (5a) made of ITO having a film thickness of 150 nm was formed as a cathode. Thus, the organic EL element (100) was formed on the transparent substrate (13).
- the organic EL element is covered with a sealing material (17) made of a glass substrate having a thickness of 300 ⁇ m, and the organic EL element (100) is surrounded by the sealing material (17) and the transparent substrate (13).
- a sealing material (17) made of a glass substrate having a thickness of 300 ⁇ m
- the organic EL element (100) is surrounded by the sealing material (17) and the transparent substrate (13).
- an adhesive (19, sealing material) an epoxy photocurable adhesive (Lux Track LC0629B manufactured by Toagosei Co., Ltd.) was used.
- the adhesive (19) filled between the sealing material (17) and the transparent substrate (13) is irradiated with UV light from the glass substrate (sealing material 17) side to cure the adhesive (19).
- the organic EL element (100) was sealed.
- the organic EL panel 1 was prepared by providing the organic EL element (100) on the transparent substrate (13) and sealing it with the sealing material (17) and the adhesive (19).
- Organic EL devices 2 to 59 were produced in the same manner as in the production of the organic EL device 1, except that the transparent electrodes 2 to 59 produced in Example 1 were used in place of the transparent electrode 1.
- the drive voltage was measured by using the voltage (V) when the front luminance on the transparent substrate (13) side of each organic EL device was 1000 cd / m 2 as the drive voltage (V).
- V the voltage
- a spectral radiance meter CS-2000 manufactured by Konica Minolta was used. It represents that it is so preferable that the numerical value of the obtained drive voltage (V) is small.
- the color change was measured by applying a current of 2.5 mA / cm 2 to the organic EL element (100) of each organic EL device, and measuring the chromaticity in the CIE 1931 color system from a position at a different angle. At this time, the chromaticity was measured at a position of 0 ° which is a normal direction to the light emitting surface on the transparent substrate (13) side and each position of 45 ° in the vertical horizontal (up, down, left and right) directions. The difference in chromaticity measured at different angles was determined as the color change ( ⁇ xy). The color change represents the viewing angle characteristic of chromaticity, and the smaller the value, the better the result.
- the organic EL device of the present invention having the transparent electrode of the present invention can be driven at a low voltage and has little color change compared to the comparative example. I understand.
- the transparent electrode of the present invention has excellent light transmission and high electrical conductivity, and is an electronic device having a low driving voltage and excellent color change stability, as well as a lighting device such as a home lighting or an interior lighting, a watch It can be used effectively in applications such as backlights for LCDs, lighting for billboard advertisements, light sources for 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. .
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Abstract
Description
前記基板と前記導電性層の間に、少なくとも下記一般式(1)で表される構造を有する第1の有機化合物と、当該第1の有機化合物とは構造の異なる第2の有機化合物とを含有する有機機能層を有することを特徴とする透明電極。
2.前記有機機能層が含有する前記第2の有機化合物が、下記一般式(2)又は一般式(3)で表される構造を有する化合物であることを特徴とする第1項に記載の透明電極。
3.前記第1の有機化合物が、前記一般式(1)におけるR1~R6が全てシアノ基である化合物であることを特徴とする第1項又は第2項に記載の透明電極。
[透明電極の基本的な構成]
本発明の透明電極の基本的な構成について、図1、図2A及び図2Bを交えて説明する。なお、各構成要素のあとの括弧内に記載の数字は、各図に記載した構成要素の符号を表す。
次に、本発明の透明電極(10)を構成する基板(13)、有機機能層(11)、導電性層(12)、光学調整層(14)について、その構成の詳細を説明する。
本発明の透明電極(10)を構成する基板(13)としては、例えば、ガラス、プラスチック等を挙げることができるが、これらに限定されない。また、本発明に係る基板(13)は、本発明の透明電極(10)が、基板(13)側から光を取り出す電子デバイス、例えば、有機エレクトロルミネッセンス素子に用いられる場合には、基板(13)は透明であることが好ましい。好ましく用いられる透明な基板(13)としては、ガラス、石英又は透明樹脂フィルムを挙げることができる。
本発明に係る有機機能層は、基板と、銀を主成分として形成される導電性層との間に設けられ、導電性層における金属原子配列を均一にし、光透過性と抵抗特性の両立を達成するための層であり、少なくともその詳細を後述する一般式(1)で表される第1の有機化合物と、当該第1の有機化合物とは構造の異なる第2の有機化合物とを含有することを特徴とし、更には、第2の有機化合物が、後述する一般式(2)又は一般式(3)で表される化合物であることが好ましい態様である。
はじめに、第1の有機化合物である下記一般式(1)で表される構造を有する化合物(以下、「一般式(1)で表される化合物」という。)について説明する。
本発明に係る有機機能層では、上記説明した一般式(1)で表される第1の有機化合物と共に、第2の有機化合物を併用することを特徴とするが、第2の有機化合物のが、下記一般式(2)で表される化合物又は一般式(3)で表される構造を有する化合物であることが好ましい。
本発明に係る第2の有機化合物が、下記一般式(2)で表される構造を有する化合物(以下、「一般式(2)で表される化合物」という。)であることが好ましい。
本発明に係る第2の有機化合物が、下記一般式(3)で表される構造を有する化合物(以下、「一般式(3)で表される化合物」という。)であることが好ましい。
本発明に係る有機機能層においては、前記一般式(1)で表される第1の有機化合物と、第1の有機化合物とは構造の異なる第2の有機化合物とを同時に含有することを特徴とし、さらには、第1の有機化合物として前記一般式(1)で表される化合物と、第2の有機化合物として前記一般式(2)又は一般式(3)で表される化合物を併用することが好ましい。
本発明に係る有機機能層の形成には、様々な薄膜形成方法を適用することができるが、その中でも、蒸着法又はスパッタ法により形成することが好ましい。本発明に適用可能な蒸着法としては、抵抗加熱蒸着法、電子線蒸着法、イオンプレーティング法、イオンビーム蒸着法等が含まれる。蒸着装置としては、例えば、シンクロン社製のBMC-800T蒸着機等を用いることができ、2つの加熱用ボートを用い、一方の加熱用ボートに一般式(1)で表される化合物を充填し、他方の加熱用ボードに一般式(2)又は一般式(3)で表される化合物を充填し、所望の比率となるように加熱条件を制御して、共蒸着により有機機能層を形成する方法を挙げることができる。
本発明に係る導電性層(12)は、銀を主成分として含有している。また、導電性層(12)は、上記説明した有機機能層(11)上に成膜される層である。
本発明の透明電極においては、図2A及び図2Bで示したように、基板(13)と有機機能層(11)との間に、金属酸化物又は金属硫化物を含む光学調整層(14)を有することが好ましい。
本発明の透明電極は、各種電子デバイスに用いることができる。電子デバイスの例としては、有機EL素子、LED(Light Emitting Diode)、液晶素子、太陽電池、タッチパネル等が挙げられ、これらの電子デバイスにおいて光透過性を必要とされる電極部材として、本発明の透明電極を適用することができる。
以下、電子デバイス用途の一例として、本発明の透明電極を用いた有機EL素子の実施の形態を説明する。
〔有機EL素子の構成〕
図3は、本発明の電子デバイスの一例として、本発明の透明電極(10)を用いた有機EL素子(100)の1例を示す概略断面図である。
透明基板(13)は、先に図1、図2A及び図2Bで説明した本発明の透明電極(10)を構成している基板(13)であり、先に説明した基板(13)のうち、光透過性を有する透明な基板(13)が用いられる。
透明電極(10)は、先に説明した本発明の透明電極(10)であり、透明基板(13)側から順に光学調整層(14)、有機機能層(11)及び導電性層(12)を順に成膜した構成である。ここでは特に、透明電極(10)はアノードとして機能するものであり、導電性層(12)が実質的なアノードとなる。
対向電極(5a)は、有機発光層ユニット(3)に電子を供給するカソードとして機能する電極膜であり、金属、合金、有機若しくは無機の導電性化合物、又はこれらの混合物等から構成されている。具体的には、アルミニウム、銀、マグネシウム、リチウム、マグネシウム/銅混合物、マグネシウム/銀混合物、マグネシウム/アルミニウム混合物、マグネシウム/インジウム混合物、インジウム、リチウム/アルミニウム混合物、希土類金属、ITO、ZnO、TiO2、SnO2等の酸化物半導体等が挙げられる。
発光層(3c)には、発光材料が含有されているが、中でも発光材料としてリン光発光ドーパント(リン光発光材料、リン光発光化合物、又はリン光性化合物ともいう。)が含有されていることが好ましい。
発光層(3c)に含有されるホスト化合物としては、室温(25℃)におけるリン光発光のリン光量子収率が0.1未満の化合物が好ましい。さらに好ましくはリン光量子収率が0.01未満である。また、発光層3cに含有される化合物の中で、その層中での体積比が50%以上であることが好ましい。
(1)リン光発光ドーパント
本発明で用いることのできる発光材料としては、リン光発光ドーパントが挙げられる。
本発明に係る蛍光発光性ドーパント(以下、「蛍光ドーパント」ともいう。)について説明する。
注入層とは、駆動電圧低下や発光輝度向上のために電極と発光層3cの間に設けられる層のことで、「有機EL素子とその工業化最前線(1998年11月30日エヌ・ティー・エス社発行)」の第2編第2章「電極材料」(123~166頁)に詳細に記載されており、正孔注入層(3a)と電子注入層(3e)とがある。
正孔輸送層(3b)は、正孔を輸送する機能を有する正孔輸送材料からなり、広い意味で正孔注入層(3a)、電子阻止層も正孔輸送層(3b)に含まれる。正孔輸送層(3b)は、単層又は複数層設けることができる。
電子輸送層(3d)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(3e)、正孔阻止層も電子輸送層(3d)に含まれる。電子輸送層(3d)は、単層構造又は複数層の積層構造として設けることができる。
阻止層は、上記した有機発光層ユニット(3)の基本構成層の他に、必要に応じて設けられるものである。例えば、特開平11-204258号公報、同11-204359号公報、及び「有機EL素子とその工業化最前線(1998年11月30日エヌ・ティー・エス社発行)」の237頁等に記載されている正孔阻止(ホールブロック)層がある。
補助電極(15)は、透明電極(10)の抵抗を下げる目的で設けられるものであって、透明電極(10)の導電性層(12)に接して設けられる。補助電極(15)を形成する材料としては、金、白金、銀、銅、アルミニウム等の抵抗が低い金属が好ましい。これらの金属は光透過性が低いため、光取り出し面(13a)からの発光光(h)の取り出しの影響のない範囲でパターン形成される。このような補助電極(15)の作製方法としては、蒸着法、スパッタリング法、印刷法、インクジェット法、エアロゾルジェット法等が挙げられる。補助電極15の線幅は、光を取り出す開口率の観点から50μm以下であることが好ましく、補助電極15の厚さは、導電性の観点から1μm以上であることが好ましい。
封止材(17)は、有機EL素子(100)を覆うものであって、板状(フィルム状)の封止部材であって接着剤(19)によって透明基板(13)側に固定されるものであってもよく、封止膜であってもよい。このような封止材(17)は、有機EL素子(100)における透明電極(10)、特に導電性層(12)及び対向電極(5a)の端子部分を露出させる状態で、少なくとも有機発光層ユニット(3)を覆う状態で設けられている。また、封止材(17)に電極を設け、有機EL素子(100)の透明電極(10)及び対向電極(5a)の端子部分と、この電極とを導通させるように構成されていてもよい。
透明基板(13)とともに、有機EL素子(100)及び封止材(17)を挟むようにして保護膜又は保護板を設けてもよい。この保護膜又は保護板は、有機EL素子(100)を機械的に保護するためのものであり、特に、封止材(17)が封止膜である場合には、有機EL素子(100)に対する機械的な保護が十分ではないため、このような保護膜若しくは保護板を設けることが好ましい。
ここでは、一例として図3に示す構成の有機EL素子(100)の製造方法について説明する。
以上説明した実施態様1で説明した有機EL素子(100)は、本発明の光透過性と導電性とを兼ね備えた透明電極(10)をアノードとして用い、この上部に有機発光層ユニット(3)とカソードとなる対向電極(5a)とを設けた構成である。このため、透明電極(10)と対向電極(5a)との間に十分な電圧を印加して有機EL素子(100)での高輝度発光を実現しつつ、透明電極1側からの発光光(L)の取り出し効率が向上することによる高輝度化を図ることが可能である。さらに、所定の輝度を得るための駆動電圧の低減による発光寿命の向上を図ることも可能になる。
〔有機EL素子の構成〕
図4は、本発明の電子デバイスの一例として、上述した透明電極(10)を用いた有機EL素子の実施態様2を示す概略断面図である。図4に示す実施態様2の有機EL素子(200)が、図3に示した実施態様1の有機EL素子(100)と異なるところは、透明電極(10)をカソードとして用いる点である。
以上説明した有機EL素子(200)は、本発明の光透過性と導電性とを兼ね備えた透明電極(10)をカソードとして用い、この上部に有機発光層ユニット(3)とアノードとなる対向電極(5b)とを設けた構成である。このため、実施態様1と同様に、透明電極(10)と対向電極(5b)との間に十分な電圧を印加して有機EL素子(200)での高輝度発光を実現しつつ、透明電極(10)側からの発光光(h)の取り出し効率が向上することによる高輝度化を図ることが可能である。さらに、所定輝度を得るための駆動電圧の低減による発光寿命の向上を図ることも可能になる。
上述した電子デバイスの一例である有機EL素子は、面発光体であるため各種の発光光源として用いることができる。例えば、家庭用照明や車内照明等の照明装置、時計や液晶用のバックライト、看板広告用照明、信号機の光源、光記憶媒体の光源、電子写真複写機の光源、光通信処理機の光源、光センサーの光源等が挙げられる。特に、カラーフィルターと組み合わせた液晶表示装置のバックライト、照明用光源としての用途に有効に用いることができる。
本発明に係る照明装置は、上記有機EL素子を具備することができる。
《透明電極の作製》
以下に説明するように、透明電極101~121を、導電性領域の面積が5cm×5cmとなるように作製した。
透明な無アルカリガラス製の基板(厚さ:0.5μm、表1、2には、単にガラスと記載)を、真空蒸着装置であるシンクロン社製のBMC-800T蒸着装置内に固定し、真空蒸着装置の真空槽に取り付けた。次いで、タングステン製抵抗加熱ボートに銀(Ag)を充填し、これを当該真空槽内に取り付けた。次に、真空槽を4×10-4Paまで減圧した後、抵抗加熱ボートを通電して加熱し、蒸着速度0.1~0.2nm/秒の範囲内で、基板上に、層厚が10nmの銀からなる導電性層1を成膜し、単層構造の透明電極1を作製した。
上記透明電極1の作製において、基板を無アルカリガラスに代えて、ポリエチレンテレフタレートフィルム(厚さ:100μm、表1には、PETと記載)を用いた以外は同様にして、単層構造の透明電極2を作製した。
上記透明電極1の作製において、基板を無アルカリガラスに代えて、ポリエチレンナフタレートフィルム(厚さ:100μm、表1には、PENと記載)を用いた以外は同様にして、単層構造の透明電極3を作製した。
上記透明電極1の作製において、基板と導電性層1の間に、下記の真空蒸着法に従って、光学調整層1を形成した以外は同様にして、透明電極4を作製した。
真空蒸着装置として、シンクロン社製のBMC-800T蒸着装置を用い、タングステン製抵抗加熱ボートにTiO2を装填し、真空槽を1×10-4Paまで減圧した後、抵抗加熱ボートに通電加熱し、抵抗加熱ボートの通電加熱条件を調整して、形成速度2.0nm/秒の条件で蒸着して、層厚30nmのTiO2から構成される光学調整層1を形成した。
上記透明電極1の作製において、基板と導電性層1の間に、下記のスパッタ法に従って、光学調整層2を形成した以外は同様にして、透明電極5を作製した。
アネルバ社のL-430S-FHSスパッタ装置を用い、Ar:20sccm、O2:5sccm、スパッタ圧:0.25Pa、室温(25℃)下、形成速度:0.74Å/秒で、層厚が30nmとなるようNb2O5をRCスパッタし、光学調整層2を形成した。ターゲット-基板間距離は、86mmであった。
上記透明電極5の作製において、光学調整層の形成材料を、Nb2O5に代えて、ITO(インジウム・スズ酸化物)を用い、スパッタ法により層厚が30nmの光学調整層3を形成した以外は同様にして、透明電極6を作製した。
上記透明電極5の作製において、光学調整層の形成材料を、Nb2O5に代えて、IZO(インジウム・亜鉛酸化物)を用い、スパッタ法により層厚が30nmの光学調整層4を形成した以外は同様にして、透明電極7を作製した。
上記透明電極4の作製において、光学調整層の形成材料を、TiO2に代えて、ZnOを用い、真空蒸着法により層厚が30nmの光学調整層5を形成した以外は同様にして、透明電極8を作製した。
上記透明電極4の作製において、光学調整層の形成材料を、TiO2に代えて、ZnSを用い、真空蒸着法により層厚が30nmの光学調整層6を形成した以外は同様にして、透明電極9を作製した。
上記透明電極1の作製において、基板と導電性層1の間に、下記の真空蒸着法に従って、層厚が15nmの有機機能層1を形成した以外は同様にして、透明電極10を作製した。
真空蒸着装置として、シンクロン社製のBMC-800T蒸着装置を用い、タングステン製抵抗加熱ボートに一般式(1)で表される化合物である例示化合物(1-1)を装填し、真空槽を1×10-4Paまで減圧した後、抵抗加熱ボートに通電加熱し、抵抗加熱ボートの通電加熱条件を調整して、形成速度0.1nm/秒の条件で蒸着して、層厚が15nmの例示化合物(1-1)から構成される有機機能層1を形成した。
上記透明電極10の作製において、有機機能層の形成材料を、例示化合物(1-1)に代えて、表1に記載の各例示化合物に変更した以外は同様にして、真空蒸着法により層厚が15nmの光学調整層2~6を形成して、透明電極11~15を作製した。
上記透明電極10の作製において、有機機能層の形成方法を、下記の共蒸着法により層厚が15nmの有機機能層7を形成した以外は同様にして、透明電極16を作製した。
真空蒸着装置として、シンクロン社製のBMC-800T蒸着装置を用い、タングステン製抵抗加熱ボートを2基配置し、一方のタングステン製抵抗加熱ボートには、一般式(1)で表される化合物である例示化合物(1-1)を装填し、他方のタングステン製抵抗加熱ボートには、一般式(2)で表される化合物である例示化合物(2-2)を装填した。
上記透明電極16の作製において、有機機能層の形成材料を、表1に記載の組み合わせに変更した以外は同様にして、共真空蒸着法により層厚が15nmの有機機能層8~11を形成して、透明電極17~20を作製した。
上記透明電極16の作製において、基板を、ガラスから、それぞれPET及びPENに変更した以外は同様にして、透明電極21及び22を作製した。
上記透明電極19の作製において、基板を、ガラスから、それぞれPET及びPENに変更した以外は同様にして、透明電極23及び24を作製した。
上記透明電極16の作製において、有機機能層の形成材料を、表1及び表2に記載の組み合わせに変更した以外は同様にして、共真空蒸着法により層厚が15nmの有機機能層14~28を形成して、透明電極25~39を作製した。
前記透明電極4~9の作製において、それぞれ光学調整層1~6と、導電性層1との間に、前記有機機能層7を設けた以外は同様にして、透明電極40~45を作製した。
前記透明電極4~9の作製において、それぞれ光学調整層1~6と、導電性層1との間に、前記有機機能層10を設けた以外は同様にして、透明電極46~51を作製した。
前記透明電極41の作製において、導電性層1に代えて、下記導電性層2を形成した以外は同様にして、透明電極52を作製した。
真空蒸着装置として、シンクロン社製のBMC-800T蒸着装置を用い、タングステン製抵抗加熱ボートを2基配置し、一方のタングステン製抵抗加熱ボートには、Agを装填し、他方のタングステン製抵抗加熱ボートには、Pdを装填した。
前記透明電極41の作製において、導電性層1に代えて、下記導電性層3を形成した以外は同様にして、透明電極53を作製した。
真空蒸着装置として、シンクロン社製のBMC-800T蒸着装置を用い、タングステン製抵抗加熱ボートを2基配置し、一方のタングステン製抵抗加熱ボートには、Agを装填し、他方のタングステン製抵抗加熱ボートには、Auを装填した。
前記透明電極41の作製において、導電性層1に代えて、下記導電性層4を形成した以外は同様にして、透明電極54を作製した。
真空蒸着装置として、シンクロン社製のBMC-800T蒸着装置を用い、タングステン製抵抗加熱ボートを2基配置し、一方のタングステン製抵抗加熱ボートには、Agを装填し、他方のタングステン製抵抗加熱ボートには、Cuを装填した。
前記透明電極41の作製において、導電性層の形成において、例示化合物(1-1)と例示化合物(2-2)との構成比率を、表2に記載の比率に変更した以外は同様にして、透明電極55~59を作製した。
〔透過率の測定〕
上記作製した各透明電極について、分光光度計(日立ハイテクノロジーズ社製 U-3300)を用い、各透明電極の基板をリファレンスとして、測定光波長550nmにおける光透過率(%)を測定した。
上記作製した各透明電極について、抵抗率計(三菱化学アナリテック社製MCP-T610)を用い、4探針法定電流印加方式で、面抵抗値(Ω/□)を測定した。
《有機ELデバイスの作製》
〔有機ELデバイス1の作製〕
実施例1で作製した透明電極1をアノードとして用い、下記の方法に従って、有機ELデバイス1を作製した。
上記有機ELデバイス1の作製において、透明電極1に代えて、実施例1で作製した透明電極2~59を用いた以外は同様にして、有機ELデバイス2~59を作製した。
上記作製した有機ELデバイスについて、下記の方法に従って、駆動電圧の測定及び白変化の測定を行った。
駆動電圧の測定は、各有機ELデバイスの透明基板(13)側での正面輝度が1000cd/m2となるときの電圧(V)を駆動電圧(V)として測定した。なお、輝度の測定には、分光放射輝度計CS-2000(コニカミノルタ社製)を用いた。得られた駆動電圧(V)の数値が小さいほど、好ましい結果であることを表す。
色変化の測定は、各有機ELデバイスの有機EL素子(100)に2.5mA/cm2の電流を加え、角度の異なる位置からCIE1931表色系における色度を測定した。この際、透明基板(13)側の発光面に対する法線方向となる0°の位置と、垂直水平(上下左右)方向にそれぞれ45°の各位置とで色度を測定した。角度の異なる位置において測定した色度の差を、色変化(Δxy)として求めた。色変化は、色度の視野角特性を表し、数値が小さいほど好ましい結果となる。
3a 正孔注入層
3b 正孔輸送層
3c 発光層
3d 電子輸送層
3e 電子注入層
5a 対向電極
10 透明電極
11 有機機能層
12 導電性層
13 基板(透明基板)
14、14A、14B 光学調整層
13a 光取り出し面
15 補助電極
17 封止材
19 接着剤
100、200 有機EL素子
h 発光光
Claims (6)
- 基板上に、少なくとも銀を主成分とする導電性層を有する透明電極であって、
前記基板と前記導電性層の間に、少なくとも下記一般式(1)で表される構造を有する第1の有機化合物と、当該第1の有機化合物とは構造の異なる第2の有機化合物とを含有する有機機能層を有することを特徴とする透明電極。
- 前記第1の有機化合物が、前記一般式(1)におけるR1~R6が全てシアノ基である化合物であることを特徴とする請求項1又は請求項2に記載の透明電極。
- 前記基板と前記有機機能層との間に、金属酸化物又は金属硫化物を含む光学調整層を有することを特徴とする請求項1から請求項3までのいずれか一項に記載の透明電極。
- 請求項1から請求項4までのいずれか一項に記載の透明電極を具備していることを特徴とする電子デバイス。
- 有機エレクトロルミネッセンス素子であることを特徴とする請求項5に記載の電子デバイス。
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WO2013141057A1 (ja) * | 2012-03-21 | 2013-09-26 | コニカミノルタ株式会社 | 有機電界発光素子 |
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US10535834B2 (en) | 2020-01-14 |
CN107278384B (zh) | 2020-09-25 |
US20180013090A1 (en) | 2018-01-11 |
JPWO2016136397A1 (ja) | 2017-12-07 |
CN107278384A (zh) | 2017-10-20 |
JP6687013B2 (ja) | 2020-04-22 |
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