WO2014065073A1 - Électrode transparente, dispositif électronique et élément organique électroluminescent - Google Patents

Électrode transparente, dispositif électronique et élément organique électroluminescent Download PDF

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WO2014065073A1
WO2014065073A1 PCT/JP2013/075983 JP2013075983W WO2014065073A1 WO 2014065073 A1 WO2014065073 A1 WO 2014065073A1 JP 2013075983 W JP2013075983 W JP 2013075983W WO 2014065073 A1 WO2014065073 A1 WO 2014065073A1
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group
layer
ring
transparent electrode
organic
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Japanese (ja)
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貴之 飯島
秀謙 尾関
和央 吉田
健 波木井
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コニカミノルタ株式会社
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022466—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8051—Anodes
    • H10K59/80517—Multilayers, e.g. transparent multilayers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
    • H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
    • H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom

Definitions

  • the present invention relates to a transparent electrode, an electronic device, and an organic electroluminescence element, and in particular, a transparent electrode having both conductivity and light transmittance and excellent durability, and an electronic device and an organic electroluminescence element using the transparent electrode About.
  • Organic EL elements also referred to as organic electroluminescent elements
  • organic electroluminescence hereinafter referred to as EL
  • EL organic electroluminescence
  • It is a solid element and has many excellent features such as high brightness, high luminous efficiency, thinness, and light weight. For this reason, it has been attracting attention in recent years as surface light emitters such as backlights for various displays, display boards such as signboards and emergency lights, and illumination light sources.
  • Such an organic EL element has a configuration in which a light emitting layer made of an organic material is disposed between two electrodes, and 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 configured as a transparent electrode.
  • an oxide semiconductor material such as indium tin oxide (SnO 2 —In 2 O 3 : Indium Tin Oxide: ITO) is generally used. Studies aiming at resistance have also been made (for example, see Patent Documents 1 and 2). However, since ITO uses rare metal indium, the material cost is high, and it is necessary to anneal at about 300 ° C. after film formation in order to reduce resistance.
  • Patent Document 3 a technique that achieves both transmittance and conductivity by forming a thin film using an alloy of silver (Ag) and magnesium (Mg) having high electrical conductivity, and low cost.
  • a technique for transmitting light has been proposed.
  • the resistance value of the electrode disclosed in Patent Document 3 is at most about 100 ⁇ / ⁇ , which is insufficient as the conductivity of the electrode.
  • magnesium since magnesium is easily oxidized, there is a problem that deterioration with time is remarkable.
  • the resistance value of the electrode disclosed in Patent Document 5 is at most 128 ⁇ / ⁇ , and it cannot be said that the electrode is a transparent electrode having sufficient conductivity and light transmittance.
  • Patent Document 6 an organic EL element in which silver is deposited with a film thickness of 15 nm as a cathode is disclosed (see Patent Document 6).
  • Patent Document 6 when the film is thinned, it is difficult to maintain the electrode characteristics because silver easily migrates, and development of a new technique is desired.
  • JP 2002-015623 A JP 2006-16961 A JP 2006-344497 A JP 2007-031786 A JP 2009-151963 A US Patent Application Publication No. 2011/0260148
  • the present invention has been made in view of the above-mentioned problems and situations, and the solution to the problem is a transparent electrode having sufficient conductivity and light transmittance and excellent in durability, an electronic device including the transparent electrode, and An organic electroluminescence device is provided.
  • the present inventor has a conductive layer and an intermediate layer provided adjacent to the conductive layer, and the conductive layer is made of silver. Constructed as a main component, the intermediate layer contains an organic compound whose LUMO (Low Unoccupied Molecular Orbital) energy level is in the range of -2.2 to -1.6 eV, thereby providing excellent conductivity.
  • the inventors have found that it is possible to realize a transparent electrode that is compatible with light transmittance and excellent in durability.
  • a transparent electrode comprising a conductive layer and an intermediate layer provided adjacent to the conductive layer,
  • the conductive layer is composed mainly of silver
  • the transparent electrode, wherein the intermediate layer contains an organic compound having an LUMO energy level in the range of -2.2 to -1.6 eV.
  • X represents NR 1 , an oxygen atom or a sulfur atom.
  • E 1 to E 8 each independently represent CR 2 or a nitrogen atom, and at least one represents a nitrogen atom.
  • R 1 and R 2 each independently represents a hydrogen atom or a substituent.
  • E 9 to E 15 each independently represent CR 4 .
  • R 3 and R 4 each independently represents a hydrogen atom or a substituent.
  • E 16 to E 22 each independently represent CR 5 .
  • R 5 represents a hydrogen atom or a substituent.
  • E 23 to E 28 each independently represent CR 7 .
  • R 6 and R 7 each independently represents a hydrogen atom or a substituent.
  • An electronic device comprising the transparent electrode according to any one of items 1 to 8.
  • An organic electroluminescence device comprising the transparent electrode according to any one of items 1 to 8.
  • a transparent electrode having both sufficient conductivity and light transmittance and excellent durability
  • an electronic device including the transparent electrode, and an organic electroluminescence element.
  • the transparent electrode of the present invention is provided with a conductive layer composed mainly of silver on the intermediate layer, and the intermediate layer has a compound having an atom having an affinity for silver atoms ( A silver-affinity compound) and an organic compound having an LUMO energy level in the range of -2.2 to -1.6 eV.
  • a silver-affinity compound an organic compound having an LUMO energy level in the range of -2.2 to -1.6 eV.
  • the silver atom first forms a two-dimensional nucleus on the surface of the intermediate layer containing the silver affinity compound having an atom having an affinity for the silver atom, and forms a two-dimensional single crystal layer around it.
  • the film is formed by the layer growth type (Frank-van der Merwe: FM type) film growth.
  • the film is easily formed into an island shape by the film growth using the Weber (VW type).
  • the island-like growth is suppressed by the organic compound in which the energy level of LUMO, which is a silver affinity compound contained in the intermediate layer, is in the range of -2.2 to -1.6 eV. It is speculated that layer growth is promoted. Accordingly, it is possible to obtain a conductive layer having a uniform thickness even though the layer thickness is thin. As a result, it is possible to obtain a transparent electrode that has ensured conductivity while maintaining light transmittance with a thinner film thickness.
  • FIG. 3 is a schematic diagram showing molecular orbitals of a ⁇ -carboline ring. It is a schematic sectional drawing which shows the 1st example of the organic EL element using the transparent electrode of this invention.
  • the transparent electrode of the present invention includes a conductive layer and an intermediate layer provided adjacent to the conductive layer.
  • the conductive layer is mainly composed of silver, and the intermediate layer has an LUMO energy level.
  • An organic compound having a position in the range of ⁇ 2.2 to ⁇ 1.6 eV is contained. This feature is a technical feature common to the inventions according to claims 1 to 10.
  • the LUMO energy level of the organic compound contained in the intermediate layer is more preferably in the range of ⁇ 2.05 to ⁇ 1.75 eV. preferable.
  • the organic compound contained in the intermediate layer is preferably an aromatic heterocyclic compound having a nitrogen atom having a lone pair that does not participate in aromaticity, and further, the aromatic heterocyclic compound is aromatic.
  • a compound having a six-membered ring structure is more preferable.
  • the organic compound contained in the intermediate layer is preferably a compound represented by the general formulas (I) to (IV).
  • the electronic device of this invention is equipped with the transparent electrode of this invention, It is characterized by the above-mentioned.
  • the organic electroluminescent element of this invention is equipped with the transparent electrode of this invention, It is characterized by the above-mentioned.
  • the LUMO energy level in the present invention is Gaussian 03 (Gaussian 03, Revision D02, MJ Frisch, et al, Gaussian, Inc., Wallingford CT, 2004.), which is molecular orbital calculation software manufactured by Gaussian, USA. ) And using B3LYP / 6-31G * as a keyword to optimize the structure of the target molecular structure (eV unit converted value). It is known that the correlation between the calculated value obtained by this method and the experimental value is high as a background to the effectiveness of this calculated value.
  • ⁇ is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.
  • FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the transparent electrode of the present invention.
  • the transparent electrode 1 has a two-layer structure in which an intermediate layer 1a and a conductive layer 1b are stacked on the intermediate layer 1a. 1a and conductive layer 1b are provided in this order.
  • the intermediate layer 1a is a layer containing an organic compound whose LUMO energy level is in the range of ⁇ 2.2 to ⁇ 1.6 eV
  • the conductive layer 1b is mainly composed of silver.
  • the main component of the conductive layer 1b refers to a component having the highest constituent ratio among the components constituting the conductive layer 1b.
  • the conductive layer 1b according to the present invention contains silver as a main component, and the composition ratio is preferably 60% by mass or more, more preferably 90% by mass or more, and 98% by mass or more. It is particularly preferred.
  • the transparency of the transparent electrode 1 of the present invention means that the light transmittance at a wavelength of 550 nm is 50% or more.
  • Examples of the substrate 11 on which the transparent electrode 1 of the present invention is formed include, but are not limited to, glass and plastic. Further, the substrate 11 may be transparent or opaque. When the transparent electrode 1 of the present invention is used in an electronic device that extracts light from the substrate 11 side, the substrate 11 is preferably transparent. Examples of the transparent substrate 11 that is preferably used include glass, quartz, and a transparent resin film.
  • the glass examples include silica glass, soda lime silica glass, lead glass, borosilicate glass, and alkali-free glass. From the viewpoints of adhesion to the intermediate layer 1a, durability, and smoothness, the surface of these glass materials may be subjected to physical treatment such as polishing, if necessary, or from an inorganic or organic material. Or a hybrid film obtained by combining these films may be formed.
  • the resin film examples include 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, polysulfone , Polyether imide, polyether ketone imide, polyamide, fluororesin, nylon, polymethyl methacrylate, acrylic or polyarylate, arton (trade name, manufactured by JSR) or abortion (trade name, manufactured by Mitsui Chemical
  • 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.
  • Such coatings and hybrid coatings have a water vapor transmission rate (25 ⁇ 0.5 ° C., relative humidity 90 ⁇ 2% RH) of 0.01 g / (m 2 ) measured by a method according to JIS K 7129-1992. 24h)
  • the following barrier film also referred to as a barrier film or the like is preferable.
  • the oxygen permeability measured by a method according to 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 ⁇ 24 h) or less high barrier film is preferable.
  • the material for forming the barrier film as described above may be any material that has a function of suppressing intrusion of factors that cause deterioration of electronic devices such as moisture and oxygen and organic EL elements. Silicon, silicon nitride, or the like can be used. Furthermore, in order to improve the brittleness of the barrier film, it is more preferable to have a laminated structure of these inorganic layers and layers (organic layers) made of an organic material. Although there is no restriction
  • the method for producing the barrier film is not particularly limited.
  • the vacuum deposition method, sputtering method, reactive sputtering method, molecular beam epitaxy method, cluster ion beam method, ion plating method, plasma polymerization method, atmospheric pressure plasma weight A combination method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, and the like can be used, but an atmospheric pressure plasma polymerization method described in JP-A No. 2004-68143 is particularly preferable.
  • the base material 11 is made of an opaque material, for example, a metal substrate such as aluminum or stainless steel, a film, an opaque resin substrate, a ceramic substrate, or the like can be used.
  • the intermediate layer 1a according to the present invention is a layer formed using an organic compound whose LUMO energy level is in the range of -2.2 to -1.6 eV.
  • the film forming method includes a method using a wet process such as a coating method, an inkjet method, a coating method, a dip method, or a vapor deposition method. (Resistance heating, EB method, etc.), a method using a dry process such as a sputtering method, a CVD method, or the like. Of these, the vapor deposition method is preferably applied.
  • the LUMO energy level of the organic compound contained in the intermediate layer 1a is in the range of ⁇ 2.2 to ⁇ 1.6 eV, preferably in the range of ⁇ 2.05 to ⁇ 1.75 eV. It is.
  • the energy level of LUMO When the energy level of LUMO is larger than ⁇ 1.6 eV, the energy level with silver (work function: ⁇ 4.3 eV) is far, which reduces the interaction between electron orbits and causes the aggregation of silver. It cannot be suppressed and the film quality is deteriorated.
  • the LUMO energy level is smaller than ⁇ 2.2 eV, electrons and excitons flow from the light emitting layer, resulting in a decrease in light emission efficiency.
  • the transparent electrode 1 of this invention can be used suitably as a cathode.
  • potassium fluoride (work function: -2.3 eV) is used as an electron injection material.
  • potassium fluoride has a problem in terms of moisture resistance. Therefore, it is conceivable to use lithium fluoride having higher moisture resistance as an electron injection material.
  • the work function of lithium fluoride is as small as ⁇ 3.0 eV, and in order to effectively transport electrons to the light emitting layer, A material having an energy level close to that of lithium fluoride is required.
  • the LUMO energy level of the organic compound used in the intermediate layer 1a of the transparent electrode 1 of the present invention is close to the energy level of lithium fluoride, it is possible to use lithium fluoride as an electron injection material. , Moisture resistance can be improved.
  • the intermediate layer 1a of the transparent electrode 1 also functions as an electron injection layer.
  • the organic compound contained in the intermediate layer 1a is preferably an aromatic heterocyclic compound having a nitrogen atom having a lone pair that does not participate in aromaticity, and further, the aromatic heterocyclic compound is aromatic.
  • a compound having a group 6-membered ring skeleton is more preferable.
  • the “nitrogen atom having an unshared electron pair not involved in aromaticity” is a nitrogen atom having an unshared electron pair, and the unshared electron pair is an aromatic of an unsaturated cyclic compound.
  • the nitrogen atom is a Group 15 element and has 5 electrons in the outermost shell. Of these, three unpaired electrons are used for covalent bonds with other atoms, and the remaining two become a pair of unshared electron pairs, so that the number of bonds of nitrogen atoms is usually three.
  • an amino group (—NR 1 R 2 ), an amide group (—C ( ⁇ O) NR 1 R 2 ), a nitro group (—NO 2 ), a cyano group (—CN), a diazo group (—N 2 ), An azide group (—N 3 ), a urea bond (—NR 1 C ⁇ ONR 2 —), an isothiocyanate group (—N ⁇ C ⁇ S), a thioamide group (—C ( ⁇ S) NR 1 R 2 ) and the like.
  • These correspond to the “nitrogen atom having an unshared electron pair not involved in aromaticity” of the present invention.
  • the resonance formula of a nitro group (—NO 2 ) can be expressed as shown in FIG. Strictly speaking, the unshared electron pair of the nitrogen atom in the nitro group is used for the resonance structure with the oxygen atom, but in the present invention, the nitrogen atom of the nitro group also has an unshared electron pair.
  • a nitrogen atom can also create a fourth bond by utilizing an unshared electron pair.
  • TBAC tetrabutylammonium chloride
  • Tris (2-phenylpyridine) iridium (III) (Ir (ppy) 3 ) is a neutral metal complex in which an iridium atom and a nitrogen atom are coordinated.
  • these compounds have a nitrogen atom, the lone pair is used for ionic bond and coordinate bond, respectively. Does not fall under “Atom”. That is, the present invention effectively uses a lone pair of nitrogen atoms that are not used for bonding.
  • nitrogen atoms are common as heteroatoms that can constitute an aromatic ring, and can contribute to the expression of aromaticity.
  • nitrogen-containing aromatic ring examples include pyridine ring, pyrazine ring, pyrimidine ring, triazine ring, pyrrole ring, imidazole ring, pyrazole ring, triazole ring, tetrazole ring and the like.
  • one of the carbon atoms constituting the five-membered ring is substituted with a nitrogen atom, but the number of ⁇ electrons is also six and satisfies the Hückel rule.
  • Nitrogen-containing aromatic ring Since the nitrogen atom of the pyrrole ring is also bonded to a hydrogen atom, an unshared electron pair is mobilized to the 6 ⁇ electron system. Therefore, although the nitrogen atom of the pyrrole ring has an unshared electron pair, it has been utilized as an essential element for the expression of aromaticity, and therefore the “unshared electron pair not involved in aromaticity” of the present invention. Does not correspond to "nitrogen atom having".
  • the imidazole ring is a nitrogen-containing aromatic ring having a structure in which two nitrogen atoms are substituted at the 1- and 3-positions in a 5-membered ring, and also has 6 ⁇ electrons.
  • the nitrogen atom N 1 is a pyridine ring-type nitrogen atom in which only one unpaired electron is mobilized to the 6 ⁇ -electron system, and the unshared electron pair is not used for aromaticity expression.
  • the nitrogen atom N 2 is a pyrrole-ring nitrogen atom that mobilizes an unshared electron pair to the 6 ⁇ electron system. Therefore, the nitrogen atom N 1 of the imidazole ring corresponds to the “nitrogen atom having an unshared electron pair not involved in aromaticity” in the present invention.
  • ⁇ -carboline is an azacarbazole compound in which a benzene ring skeleton, a pyrrole ring skeleton, and a pyridine ring skeleton are condensed in this order.
  • the nitrogen atom N 3 of the pyridine ring mobilizes only one unpaired electron
  • the nitrogen atom N 4 of the pyrrole ring mobilizes an unshared electron pair, respectively, from the carbon atoms forming the ring.
  • the total number of ⁇ electrons is 14 aromatic rings.
  • the nitrogen atom N 3 of the pyridine ring corresponds to the “nitrogen atom having an unshared electron pair not involved in aromaticity” of the present invention, but the nitrogen atom of the pyrrole ring N 4 does not fall into this category.
  • the nitrogen atom of the pyrrole ring N 4 does not fall into this category.
  • the “nitrogen atom having an unshared electron pair not involved in aromaticity” of the present invention expresses a strong interaction between the unshared electron pair and silver which is the main component of the conductive layer 1b. Is important to.
  • a nitrogen atom is preferably a nitrogen atom in a nitrogen-containing aromatic ring from the viewpoint of stability and durability.
  • the organic compound contained in the intermediate layer 1a is a compound represented by the general formulas (I) to (IV).
  • the compound contained in the intermediate layer 1a is preferably a compound represented by the following general formula (I).
  • X represents NR 1 , an oxygen atom or a sulfur atom.
  • E 1 to E 8 each independently represent CR 2 or a nitrogen atom, and at least one represents a nitrogen atom.
  • R 1 and R 2 each independently represents a hydrogen atom or a substituent.
  • the substituent represented by R 1 includes an alkyl group (for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group, dodecyl group).
  • alkyl group for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group, dodecyl group.
  • halogen atom eg fluorine atom, chlorine atom, bromine atom etc.
  • fluorinated hydrocarbon group eg fluoromethyl group, trifluoromethyl
  • pentafluoroethyl group pentafluorophenyl group, etc.
  • cyano group nitro group, hydroxy group, mercapto group
  • silyl group for example, trimethylsilyl group, triisopropylsilyl group, triphenylsilyl group, phenyldiethylsilyl group, etc.
  • a phosphoric acid ester group for example, dihexyl phosphoryl group
  • a phosphite group for example, diphenylphosphinyl group
  • phosphono group and the like.
  • examples of the substituent represented by R 2 include the same substituents represented by R 1 .
  • E 9 to E 15 each independently represent CR 4 .
  • R 3 and R 4 each independently represents a hydrogen atom or a substituent.
  • examples of the substituent represented by R 3 and R 4 include the same substituents as those represented by R 1 in the general formula (I).
  • E 16 to E 22 each independently represent CR 5 .
  • R 5 represents a hydrogen atom or a substituent.
  • examples of the substituent represented by R 5 include the same substituents as those represented by R 1 in the above general formula (I).
  • E 23 to E 28 each independently represent CR 7 .
  • R 6 and R 7 each independently represents a hydrogen atom or a substituent.
  • examples of the substituent represented by R 6 and R 7 include the same substituents as those represented by R 1 in the general formula (I).
  • the organic compound according to the present invention can be easily synthesized according to a conventionally known synthesis method.
  • middle layer 1a of this invention is shown, this invention is not limited to this.
  • the conductive layer 1b is a layer composed mainly of silver, and is a layer formed on the intermediate layer 1a.
  • a method for forming such a conductive layer 1b a method using a wet process such as a coating method, an inkjet method, a coating method, a dip method, a vapor deposition method (resistance heating, EB method, etc.), a sputtering method, a CVD method, or the like. And a method using a dry process such as the above. Of these, the vapor deposition method is preferably applied.
  • the conductive layer 1b is formed on the intermediate layer 1a, so that the conductive layer 1b is sufficiently conductive even without a high-temperature annealing treatment (for example, a heating process at 150 ° C. or higher) after the formation of the conductive layer.
  • a high-temperature annealing treatment for example, a heating process at 150 ° C. or higher
  • it is characterized by having, it may have been subjected to high-temperature annealing treatment after film formation, if necessary.
  • the conductive layer 1b may be made of an alloy containing silver (Ag).
  • Examples of such an alloy include silver magnesium (AgMg), silver copper (AgCu), silver palladium (AgPd), silver, and the like. Palladium copper (AgPdCu), silver indium (AgIn), etc. are mentioned.
  • the conductive layer 1b as described above may have a structure in which a layer composed mainly of silver is divided into a plurality of layers as necessary.
  • the conductive layer 1b preferably has a layer thickness 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 transmittance of the transparent electrode is improved, which is more preferable.
  • the layer thickness is thicker than 5 nm because the conductivity of the layer is sufficient.
  • the transparent electrode 1 having a laminated structure including the intermediate layer 1a and the conductive layer 1b formed thereon the upper part of the conductive layer 1b may be covered with a protective film, Another conductive layer may be laminated.
  • the protective film and the other conductive layer have light transmittance so as not to impair the light transmittance of the transparent electrode 1.
  • the transparent electrode 1 configured as described above has silver as a main component on the intermediate layer 1a formed using an organic compound having an LUMO energy level in the range of ⁇ 2.2 to ⁇ 1.6 eV. It is the structure which provided the electroconductive layer 1b comprised as follows. Thus, when the conductive layer 1b is formed on the intermediate layer 1a, the silver atoms constituting the conductive layer 1b interact with the organic compound constituting the intermediate layer 1a, and the silver intermediate layer 1a. The diffusion distance on the surface is reduced, and aggregation of silver is suppressed.
  • a conductive layer generally composed of silver as a main component
  • an island-shaped growth type (Volume-Weber: VW type) thin film is grown, so that silver particles are isolated in an island shape.
  • the layer thickness is thin, it is difficult to obtain conductivity, and the sheet resistance value is increased. Therefore, it is necessary to increase the layer thickness in order to ensure conductivity.
  • the layer thickness is increased, the light transmittance is lowered, so that it is not suitable as a transparent electrode.
  • the transparent electrode 1 of the configuration of the present invention since aggregation of silver is suppressed on the intermediate layer 1a as described above, in the film formation of the conductive layer 1b composed mainly of silver, the layered A thin film grows in a growth type (Frank-van der Merwe: FM type).
  • the transparency of the transparent electrode 1 of the present invention means that the light transmittance at a wavelength of 550 nm is 50% or more.
  • each of the above materials used as the intermediate layer 1a is a conductive material mainly composed of silver. Compared with the conductive layer 1b, a film having sufficiently good light transmittance is formed.
  • the conductivity of the transparent electrode 1 is ensured mainly by the conductive layer 1b. Therefore, as described above, the conductive layer 1b composed mainly of silver has a thinner layer to ensure conductivity, thereby improving the conductivity and light transmission of the transparent electrode 1. It is possible to achieve a balance with improvement in performance.
  • the transparent electrode 1 having the above-described configuration can be used for various electronic devices.
  • Examples of electronic devices include organic EL elements, LEDs (light emitting diodes), liquid crystal elements, solar cells, touch panels, and the like.
  • As electrode members that require light transmission in these electronic devices the above-mentioned transparent The electrode 1 can be used.
  • embodiment of the organic EL element using the transparent electrode 1 of this invention is described as an example of a use.
  • FIG. 8 is a schematic cross-sectional view showing a first example of an organic EL element using the transparent electrode 1 described above as an example of the electronic device of the present invention. Below, the structure of an organic EL element is demonstrated based on this figure.
  • the organic EL element 100 is provided on a transparent substrate (base material) 13, and the light emitting functional layer 3 is configured using the transparent electrode 1, an organic material, and the like in order from the transparent substrate 13 side. , And the counter electrode 5a are laminated in this order.
  • the transparent electrode 1 of the present invention described above is used as the transparent electrode 1.
  • the organic EL element 100 is configured to extract the generated light (hereinafter referred to as emission light h) from at least the transparent substrate 13 side.
  • the layer structure of the organic EL element 100 is not limited to the example described below, and may be a general layer structure.
  • the transparent electrode 1 functions as an anode (that is, an anode)
  • the counter electrode 5a functions as a cathode (that is, a cathode).
  • the light emitting functional layer 3 has a structure in which a hole injection layer 3a / a hole transport layer 3b / a light emitting layer 3c / an electron transport layer 3d / an electron injection layer 3e are stacked in this order from the transparent electrode 1 side which is an anode.
  • 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 made of an inorganic material.
  • the light emitting functional layer 3 may be laminated with a hole blocking layer, an electron blocking layer, or the like as necessary.
  • the light emitting layer 3c may have a structure in which each color light emitting layer that generates emitted light in each wavelength region is laminated, and each color light emitting layer 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 a cathode may also have a laminated structure as necessary. In such a configuration, only a portion where the light emitting functional layer 3 is sandwiched between the transparent electrode 1 and the counter electrode 5 a becomes a light emitting region in the organic EL element 100.
  • the auxiliary electrode 15 may be provided in contact with the conductive layer 1b of the transparent electrode 1 for the purpose of reducing the resistance of the transparent electrode 1.
  • the organic EL element 100 having the above configuration is sealed with a sealing material 17 described later on the transparent substrate 13 for the purpose of preventing deterioration of the light emitting functional layer 3 formed using an organic material or the like. ing.
  • the sealing material 17 is fixed to the transparent substrate 13 side with an adhesive 19. However, it is assumed that the terminal portions of the transparent electrode 1 and the counter electrode 5a are provided on the transparent substrate 13 so as to be exposed from the sealing material 17 while being insulated from each other by the light emitting functional layer 3.
  • the details of the main layers for constituting the organic EL element 100 described above will be described in terms of the transparent substrate 13, the transparent electrode 1, the counter electrode 5a, the light emitting layer 3c of the light emitting functional layer 3, the other layers of the light emitting functional layer 3, and the auxiliary.
  • the electrode 15 and the sealing material 17 will be described in this order.
  • the transparent substrate 13 is the base material 11 on which the transparent electrode 1 of the present invention described above is provided, and the transparent base material 11 having light transmittance among the base materials 11 described above is used.
  • the transparent electrode 1 is the transparent electrode 1 of the present invention described above, and has a configuration in which an intermediate layer 1a and a conductive layer 1b are sequentially formed from the transparent substrate 13 side.
  • the transparent electrode 1 functions as an anode
  • the conductive layer 1b is a substantial anode.
  • the counter electrode 5a is an electrode film that functions as a cathode for supplying electrons to the light emitting functional layer 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. Further, the sheet resistance value as 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.
  • the counter electrode is made of a conductive material having a good light transmission property selected from the above-described conductive materials. 5a should just be comprised.
  • the light emitting layer 3c used in the present invention contains a light emitting material, and among them, a phosphorescent compound (phosphorescent material, phosphorescent compound, phosphorescent compound) is contained as the light emitting material. Is preferred.
  • 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 the light emitting portion is the light emitting layer 3c. Even within the layer, it may be the interface between the light emitting layer 3c and the adjacent layer.
  • the 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 the light emitting layer 3c is a layer thickness also including the said auxiliary layer, when a nonluminous auxiliary layer exists between the light emitting layers 3c.
  • the thickness of each light emitting layer is preferably adjusted within the range of 1 to 50 nm, and more preferably within the range of 1 to 20 nm.
  • the plurality of stacked light emitting layers correspond to blue, green, and red light emission colors, there is no particular limitation on the relationship between the thicknesses of the blue, green, and red light emitting layers.
  • the light emitting layer 3c configured as described above is formed by using a known thin film forming method such as a vacuum evaporation method, a spin coating method, a casting method, an LB method, and an ink jet method, for example, by using a light emitting material and a host compound described later. Can be formed.
  • a known thin film forming method such as a vacuum evaporation method, a spin coating method, a casting method, an LB method, and an ink jet method, for example, by using a light emitting material and a host compound described later. Can be formed.
  • the light emitting layer 3c may be configured by mixing a plurality of light emitting materials, or may be configured by mixing a phosphorescent compound and a fluorescent compound (fluorescent material, fluorescent dopant). Good.
  • the structure of the light emitting layer 3c preferably contains a host compound (light emitting host) and a light emitting material (light emitting dopant compound) and emits light from the light emitting material.
  • a compound having a phosphorescence quantum yield of phosphorescence emission at room temperature (25 ° C.) of 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). .
  • the known host compound a compound having a hole transporting ability and an electron transporting ability while preventing the emission of light from being increased in wavelength and having a high Tg (glass transition temperature) is preferable.
  • the glass transition temperature here is a value determined by a method based on JIS K 7121 using DSC (Differential Scanning Calorimetry).
  • H1 to H79 Specific examples (H1 to H79) of host compounds that can be used in the present invention are shown below, but are not limited thereto.
  • x and y in the host compound H68 and p, q and r in the host compound H69 represent the ratio of the random copolymer.
  • Luminescent material (1) Phosphorescent compound As the luminescent material that can be used in the present invention, a phosphorescent compound is exemplified.
  • a phosphorescent compound 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.), and the phosphorescence quantum yield is 0 at 25 ° C.
  • a preferred phosphorescence quantum yield is 0.1 or more, although it is defined as 0.01 or more compounds.
  • 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. Although the phosphorescence quantum yield in a solution can be measured using various solvents, when the phosphorescent compound is used in the present invention, the above phosphorescence quantum yield (0.01 or more) is obtained in any solvent. It only has to be achieved.
  • the phosphorescent compound There are two types of light emission principles of the phosphorescent compound. One is that recombination of carriers occurs on the host compound to which carriers are transported to generate an excited state of the host compound, and this energy is transferred to the phosphorescent compound to emit light from the phosphorescent compound. Energy transfer type. The other is a carrier trap type in which the phosphorescent compound becomes a carrier trap, and recombination of carriers occurs on the phosphorescent compound, and light emission from the phosphorescent compound is obtained. In either case, the condition is that the excited state energy of the phosphorescent compound is lower than the excited state energy of the host compound.
  • the phosphorescent compound can be appropriately selected from known compounds used for the light-emitting layer of a general organic EL device, but preferably contains a group 8 to 10 metal in the periodic table of elements. More preferred are iridium compounds, more preferred are iridium compounds, osmium compounds, platinum compounds (platinum complex compounds), and rare earth complexes, and most preferred are iridium compounds.
  • At least one light emitting layer 3c may contain two or more phosphorescent compounds, and the concentration ratio of the phosphorescent compounds in the light emitting layer 3c is in the thickness direction of the light emitting layer 3c. It may have changed.
  • the phosphorescent compound 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.
  • the compound (phosphorescent compound) contained in the light emitting layer 3c is preferably a compound represented by the following general formula (A).
  • the phosphorescent compound represented by the general formula (A) (also referred to as a phosphorescent metal complex) is preferably contained in the light emitting layer 3c of the organic EL element 100 as a light emitting dopant. However, it may be contained in a light emitting functional layer other than the light emitting layer 3c.
  • P and Q each independently represent a carbon atom or a nitrogen atom.
  • a 1 represents an atomic group forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring together with P—C.
  • a 2 represents an atomic group that forms an aromatic heterocycle with QN.
  • P 1 -L 1 -P 2 represents a bidentate ligand, and P 1 and P 2 each independently represent a carbon atom, a nitrogen atom or an oxygen atom.
  • L 1 represents an atomic group that forms a bidentate ligand together with P 1 and P 2 .
  • j1 represents an integer of 1 to 3
  • j2 represents an integer of 0 to 2
  • j1 + j2 is 2 or 3.
  • M 1 represents a group 8-10 transition metal element in the periodic table.
  • the aromatic hydrocarbon ring formed by A 1 together with PC includes benzene ring, biphenyl ring, naphthalene ring, azulene ring, anthracene ring, phenanthrene ring, pyrene ring, chrysene ring, naphthacene ring , Triphenylene ring, o-terphenyl ring, m-terphenyl ring, p-terphenyl ring, acenaphthene ring, coronene ring, fluorene ring, fluoranthrene ring, naphthacene ring, pentacene ring, perylene ring, pentaphen ring, picene ring , Pyrene ring, pyranthrene ring, anthraanthrene ring and the like. These rings may further have a substituent represented by R 1 in the general formula (I).
  • the aromatic heterocycle formed by A 1 together with P—C includes a furan ring, a thiophene ring, an oxazole ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, Benzimidazole ring, oxadiazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, indole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, phthalazine ring, carbazole ring, azacarbazole A ring etc.
  • the azacarbazole ring refers to one in which at least one carbon atom of the benzene ring constituting the carbazole ring is replaced with a nitrogen atom.
  • These rings may further have a substituent represented by R 1 in the general formula (I).
  • the aromatic heterocycle formed by A 2 together with QN includes an oxazole ring, an oxadiazole ring, an oxatriazole ring, an isoxazole ring, a tetrazole ring, a thiadiazole ring, a thiatriazole ring, Examples include a thiazole ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, an imidazole ring, a pyrazole ring, and a triazole ring. These rings may further have a substituent represented by R 1 in the general formula (I).
  • Examples of the bidentate ligand represented by P 1 -L 1 -P 2 include phenylpyridine, phenylpyrazole, phenylimidazole, phenyltriazole, phenyltetrazole, pyrazabol, acetylacetone, and picolinic acid.
  • j2 represents an integer of 0 to 2, and j2 is preferably 0.
  • M 1 is a transition metal element of Group 8 to Group 10 (also simply referred to as a transition metal) in the periodic table of elements.
  • iridium is preferable.
  • Z represents a hydrocarbon ring group or a heterocyclic group.
  • P and Q each independently represent a carbon atom or a nitrogen atom.
  • a 1 represents an atomic group forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring together with P—C.
  • P 1 -L 1 -P 2 represents a bidentate ligand, and P 1 and P 2 each independently represent a carbon atom, a nitrogen atom or an oxygen atom.
  • L 1 represents an atomic group that forms a bidentate ligand together with P 1 and P 2 .
  • j1 represents an integer of 1 to 3
  • j2 represents an integer of 0 to 2
  • j1 + j2 is 2 or 3.
  • M 1 represents a group 8-10 transition metal element in the periodic table.
  • examples of the hydrocarbon ring group represented by Z include a non-aromatic hydrocarbon ring group and an aromatic hydrocarbon ring group, and examples of the non-aromatic hydrocarbon ring group include a cyclopropyl group. , Cyclopentyl group, cyclohexyl group and the like. These groups may be unsubstituted or may have a substituent represented by R 1 in the general formula (I).
  • aromatic hydrocarbon ring group examples include, for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, anthryl group, Examples include an azulenyl group, an acenaphthenyl group, a fluorenyl group, a phenanthryl group, an indenyl group, a pyrenyl group, and a biphenylyl group. These groups may be unsubstituted or may have a substituent represented by R 1 in the general formula (I).
  • examples of the heterocyclic group represented by Z include a non-aromatic heterocyclic group and an aromatic heterocyclic group.
  • examples of the non-aromatic heterocyclic group include an epoxy ring and an aziridine group. Ring, thiirane ring, oxetane ring, azetidine ring, thietane ring, tetrahydrofuran ring, dioxolane ring, pyrrolidine ring, pyrazolidine ring, imidazolidine ring, oxazolidine ring, tetrahydrothiophene ring, sulfolane ring, thiazolidine ring, ⁇ -caprolactone ring, ⁇ - Caprolactam ring, piperidine ring, hexahydropyridazine ring, hexahydropyrimidine ring, piperazine ring, morpholine ring, tetrahydropyran ring
  • aromatic heterocyclic group examples include a pyridyl group, pyrimidinyl group, furyl group, pyrrolyl group, imidazolyl group, benzoimidazolyl group, pyrazolyl group, pyrazinyl group, triazolyl group (for example, 1,2,4-triazol-1-yl).
  • the group represented by Z is preferably an aromatic hydrocarbon ring group or an aromatic heterocyclic group.
  • the aromatic hydrocarbon ring that A 1 forms with PC includes benzene ring, biphenyl ring, naphthalene ring, azulene ring, anthracene ring, phenanthrene ring, pyrene ring, chrysene ring, naphthacene ring , Triphenylene ring, o-terphenyl ring, m-terphenyl ring, p-terphenyl ring, acenaphthene ring, coronene ring, fluorene ring, fluoranthrene ring, naphthacene ring, pentacene ring, perylene ring, pentaphen ring, picene ring , Pyrene ring, pyranthrene ring, anthraanthrene ring and the like. These groups may be unsubstituted or may have a substituent represented by R 1 in the general formula (I).
  • the aromatic heterocycle formed by A 1 together with P—C includes a furan ring, a thiophene ring, an oxazole ring, a pyrrole ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, Benzimidazole ring, oxadiazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, indole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, phthalazine ring, carbazole ring, carboline ring And azacarbazole ring.
  • the azacarbazole ring refers to one in which at least one carbon atom of the benzene ring constituting the carbazole ring is replaced with a nitrogen atom.
  • These groups may be unsubstituted or may have a substituent represented by R 1 in the general formula (I).
  • examples of the bidentate ligand represented by P 1 -L 1 -P 2 include phenylpyridine, phenylpyrazole, phenylimidazole, phenyltriazole, phenyltetrazole, pyrazabol, acetylacetone, picolinic acid, and the like. Is mentioned.
  • j2 represents an integer of 0 to 2, but j2 is preferably 0.
  • 8 to Group 10 transition metal elements of the periodic table represented by M 1 are the compounds of formula (A), 8 to Group 10 Group in the periodic table represented by M 1 It is synonymous with the transition metal element.
  • R 03 represents a substituent.
  • R 04 represents a hydrogen atom or a substituent, and a plurality of R 04 may be bonded to each other to form a ring.
  • n01 represents an integer of 1 to 4.
  • R 05 represents a hydrogen atom or a substituent, and a plurality of R 05 may be bonded to each other to form a ring.
  • n02 represents 1 or 2.
  • R 06 represents a hydrogen atom or a substituent, and may combine with each other to form a ring.
  • n03 represents an integer of 1 to 4.
  • Z 1 represents an atomic group necessary for forming a 6-membered aromatic hydrocarbon ring or a 5-membered or 6-membered aromatic heterocycle together with C—C.
  • Z 2 represents an atomic group necessary for forming a hydrocarbon ring group or a heterocyclic group.
  • P 1 -L 1 -P 2 represents a bidentate ligand, and P 1 and P 2 each independently represent a carbon atom, a nitrogen atom or an oxygen atom.
  • L 1 represents an atomic group that forms a bidentate ligand together with P 1 and P 2 .
  • j1 represents an integer of 1 to 3
  • j2 represents an integer of 0 to 2
  • j1 + j2 is 2 or 3.
  • M 1 represents a group 8-10 transition metal element in the periodic table.
  • R 03 and R 06 , R 04 and R 06, and R 05 and R 06 may be bonded to each other to form a ring.
  • each of the substituents represented by R 03 , R 04 , R 05 and R 06 has the same meaning as the substituent represented by R 1 in the general formula (I).
  • examples of the 6-membered aromatic hydrocarbon ring formed by Z 1 together with C—C include a benzene ring. These rings may further have a substituent, and examples of such a substituent include the same substituents represented by R 1 in the general formula (I).
  • examples of the 5- or 6-membered aromatic heterocycle formed by Z 1 together with C—C include, for example, an oxazole ring, an oxadiazole ring, an oxatriazole ring, an isoxazole ring, a tetrazole ring, Examples include thiadiazole ring, thiatriazole ring, isothiazole ring, thiophene ring, furan ring, pyrrole ring, pyridine ring, pyridazine ring, pyrimidine ring, pyrazine ring, triazine ring, imidazole ring, pyrazole ring, triazole ring and the like. These rings may further have a substituent, and examples of such a substituent include the same substituents represented by R 1 in the general formula (I).
  • examples of the hydrocarbon ring group represented by Z 2 include a non-aromatic hydrocarbon ring group and an aromatic hydrocarbon ring group, and examples of the non-aromatic hydrocarbon ring group include cyclopropyl. Group, cyclopentyl group, cyclohexyl group and the like. These groups may be unsubstituted or may have a substituent. Examples of such a substituent include the same substituents represented by R 1 in the general formula (I). .
  • aromatic hydrocarbon ring group examples include, for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, naphthyl group, anthryl group, Examples include an azulenyl group, an acenaphthenyl group, a fluorenyl group, a phenanthryl group, an indenyl group, a pyrenyl group, and a biphenylyl group. These groups may be unsubstituted or may have a substituent. Examples of such a substituent include the same substituents represented by R 1 in the general formula (I). .
  • examples of the heterocyclic group represented by Z 2 include a non-aromatic heterocyclic group and an aromatic heterocyclic group.
  • examples of the non-aromatic heterocyclic group include an epoxy ring, Aziridine ring, thiirane ring, oxetane ring, azetidine ring, thietane ring, tetrahydrofuran ring, dioxolane ring, pyrrolidine ring, pyrazolidine ring, imidazolidine ring, oxazolidine ring, tetrahydrothiophene ring, sulfolane ring, thiazolidine ring, ⁇ -caprolactone ring, ⁇ -Caprolactam ring, piperidine ring, hexahydropyridazine ring, hexahydropyrimidine ring, piperazine ring, morpholine ring, tetrahydropyran
  • aromatic heterocyclic group examples include a pyridyl group, pyrimidinyl group, furyl group, pyrrolyl group, imidazolyl group, benzoimidazolyl group, pyrazolyl group, pyrazinyl group, triazolyl group (for example, 1,2,4-triazol-1-yl).
  • the group formed by Z 1 and Z 2 is preferably a benzene ring.
  • bidentate ligand represented by P 1 -L 1 -P 2 is In formula (A), coordination of bidentate represented by P 1 -L 1 -P 2 Synonymous with rank.
  • 8 to Group 10 transition metal elements of the periodic table represented by M 1 are the compounds of formula (A), 8 to Group 10 Group in the periodic table represented by M 1 It is synonymous with the transition metal element.
  • the phosphorescent compound can be appropriately selected from known compounds used for the light emitting layer 3c of the organic EL element 100.
  • Pt-1 to Pt-3, A-1, Ir-1 to Ir-45 Specific examples (Pt-1 to Pt-3, A-1, Ir-1 to Ir-45) of the phosphorescent compounds according to the present invention are shown below, but the present invention is not limited to these.
  • m and n represent the number of repetitions.
  • phosphorescent compounds also referred to as phosphorescent metal complexes
  • Fluorescent compounds include coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, pyrylium dyes, Examples include perylene dyes, stilbene dyes, polythiophene dyes, and rare earth complex phosphors.
  • 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.
  • the hole injection layer 3a may be present between the anode and the light emitting layer 3c or the hole transport layer 3b, and the electron injection layer 3e may be present between the cathode and the light emitting layer 3c or the electron transport layer 3d. .
  • JP-A-9-45479 JP-A-9-260062, JP-A-8-288069 and the like.
  • Specific examples thereof include phthalocyanine represented by copper phthalocyanine.
  • examples thereof include a layer, an oxide layer typified by vanadium oxide, an amorphous carbon layer, and a polymer layer using a conductive polymer such as polyaniline (emeraldine) or polythiophene.
  • the electron injection layer 3e Details of the electron injection layer 3e are described in JP-A-6-325871, JP-A-9-17574, JP-A-10-74586, and the like, and specifically, strontium, aluminum and the like are represented. Examples thereof include a metal layer, an alkali metal halide layer typified by potassium fluoride, an alkaline earth metal compound layer typified by magnesium fluoride, and an oxide layer typified by molybdenum oxide.
  • the electron injection layer 3e is desirably a very thin film, and although depending on the material, the layer thickness is preferably in the range of 1 nm to 10 ⁇ m.
  • the hole transport layer 3b is made of a hole transport material having a function of transporting holes, and in a broad sense, 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 either hole injection or transport or 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 (TPD), 2,2-bis (4-di-p-tolylaminophenyl) propane, 1,1-bis (4-di-p-tolylaminophenyl) cyclohexane, N, N, N ′, N′-tetra-p-tolyl-4,4′-diaminobiphenyl, 1,1-bis (4-di-p-tolyl) Aminophenyl) -4-phenylcyclohexane, bis (4-dimethylamino-2-methylphenyl) phenylmethane, bis (4-di-p-tolylaminoph
  • polymer materials in which these materials are introduced into polymer chains or these materials are used as polymer main chains can also be used.
  • inorganic compounds such as p-type-Si and p-type-SiC can also be used as the hole injection material and the hole transport material.
  • 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. be able to.
  • the layer thickness of the hole transport layer 3b is not particularly limited, but is usually in the range of 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.
  • Examples thereof include JP-A-4-297076, JP-A-2000-196140, 2001-102175, J.A. Appl. Phys. 95, 5773 (2004), and the like.
  • 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.
  • an electron transport material also serving as a hole blocking material constituting a layer portion adjacent to the light emitting layer 3c
  • electrons injected from the cathode are used. What is necessary is just to have the function to transmit 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 an 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 (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 (Znq), etc.
  • Mg Metal complexes replaced with Cu, Ca, Sn, Ga, or Pb 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.
  • a distyrylpyrazine derivative that is also used as a material for the light emitting layer 3c can be used as a material for the electron transport layer 3d, and n-type Si, n, like the hole injection layer 3a and the hole transport layer 3b.
  • An inorganic semiconductor such as type-SiC can also be used as the material of 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.
  • the 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 an impurity to increase the n property.
  • examples thereof include JP-A-4-297076, JP-A-10-270172, JP-A-2000-196140, 2001-102175, J.A. Appl. Phys. 95, 5773 (2004), and the like.
  • the electron transport layer 3d contains potassium, a potassium compound, or the like.
  • a potassium compound potassium fluoride etc. can be used, for example.
  • the material (electron transporting compound) of the electron transport layer 3d the same material as that constituting the intermediate layer 1a described above may be used.
  • the electron transport layer 3d that also serves as the electron injection layer 3e the same material as that of the intermediate layer 1a described above may be used.
  • the blocking layer is provided as necessary in addition to the basic constituent layer of the light emitting functional layer 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 Nov. 30, 1998)”. There is a hole blocking (hole blocking) layer.
  • the hole blocking layer has the function of the 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 the function of the 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 thickness of the hole blocking layer is preferably in the range of 3 to 100 nm, 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 1, and is provided in contact with the conductive layer 1 b of the transparent electrode 1.
  • the material for forming the auxiliary electrode 15 is preferably a metal with low resistance such as gold, platinum, silver, copper, or aluminum. 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, an aerosol jet method, and the like.
  • 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 and may be a plate-like (film-like) sealing member that is fixed to the transparent substrate 13 side by the adhesive 19. It may be a membrane. Such a sealing material 17 is provided in a state of covering at least the light emitting functional layer 3 in a state in which the terminal portions of the transparent electrode 1 and the counter electrode 5a in the organic EL element 100 are exposed. Further, an electrode may be provided on the sealing material 17 so that the transparent electrode 1 and the terminal portion of the counter electrode 5a of the organic EL element 100 are electrically connected to this 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 thinner 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.
  • a thin film-like polymer substrate or metal substrate 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 method in accordance with the above is 1 ⁇ 10 ⁇ 3 g / (m 2 ⁇ 24 h) or less. It is preferable.
  • the above substrate material may be processed into a concave plate shape and used as the 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 the plate-shaped sealing material 17 to the transparent substrate 13 side seals the organic EL element 100 sandwiched between the sealing material 17 and the transparent substrate 13. It is used as a sealing agent.
  • Specific examples of such an adhesive 19 include photocuring and thermosetting adhesives having reactive vinyl groups of acrylic acid-based oligomers and methacrylic acid-based oligomers, moisture-curing types such as 2-cyanoacrylic acid esters, and the like. Can be mentioned.
  • epoxy-based heat and chemical curing type (two-component mixing), hot-melt type polyamide, polyester, polyolefin, and cationic curing type ultraviolet curing epoxy resin adhesive can also be exemplified.
  • 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.
  • Application of the adhesive 19 to the bonding portion between the sealing material 17 and the transparent substrate 13 may be performed using a commercially available dispenser or may be printed like screen printing.
  • an inert gas such as nitrogen or argon or a fluorine is used. It is preferable to inject an inert liquid such as activated hydrocarbon or silicon oil. A vacuum can also be used. Moreover, a hygroscopic compound can also be enclosed inside.
  • Examples of the hygroscopic compound include metal oxides (eg, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide), sulfates (eg, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt sulfate). Etc.), 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, etc.), and anhydrous salts are preferably used in sulfates, metal halides and perchloric acids.
  • metal oxides eg, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide
  • sulfates eg, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt s
  • the sealing material 17 when a sealing film is used as the sealing material 17, the light emitting functional layer 3 in the organic EL element 100 is completely covered and the terminal portions of the transparent electrode 1 and the counter electrode 5a in the organic EL element 100 are exposed.
  • a sealing film is provided on the transparent substrate 13.
  • Such a sealing film is composed of an inorganic material or an organic material.
  • it is made of a material having a function of suppressing intrusion of a substance that causes deterioration of the light emitting functional layer 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 material 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 in particular, when the sealing material 17 is a sealing film, sufficient mechanical protection is provided for the organic EL element 100. Therefore, it is preferable to provide such a protective film or protective plate.
  • the protective film or 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 it is particularly preferable to use a polymer film because it is lightweight and thin.
  • an intermediate layer 1a made of an organic compound having an LUMO energy level in the range of ⁇ 2.2 to ⁇ 1.6 eV is formed on the transparent substrate 13 to a thickness of 1 ⁇ m or less, preferably 10 to 100 nm.
  • the conductive layer 1b made of silver (or an alloy containing silver) is intermediated by an appropriate method such as an evaporation method so as to have a layer thickness within a range of 5 to 20 nm, preferably within a range of 5 to 12 nm.
  • a transparent electrode 1 formed on the layer 1a and serving as an anode is produced.
  • a hole injection layer 3 a, a hole transport layer 3 b, a light emitting layer 3 c, an electron transport layer 3 d, and an electron injection layer 3 e are formed in this order to form the light emitting functional layer 3.
  • the film formation of each of these layers includes spin coating, casting, ink jet, vapor deposition, and printing, but vacuum vapor deposition is easy because a homogeneous film is easily obtained and pinholes are difficult to generate.
  • the method or spin coating method is particularly preferred.
  • different film formation methods may be applied for each layer.
  • the vapor deposition conditions vary depending on the type of compound used, but generally a boat heating temperature of 50 to 450 ° C.
  • the counter electrode 5a serving as a cathode is formed thereon by an appropriate film forming method such as a vapor deposition method or a sputtering method.
  • the counter electrode 5 a is patterned in a shape in which a terminal portion is drawn from the upper side of the light emitting functional layer 3 to the periphery of the transparent substrate 13 while maintaining the insulating state with respect to the transparent electrode 1 by the light emitting functional layer 3.
  • the organic EL element 100 is obtained.
  • the sealing material 17 which covers at least the light emitting functional layer 3 is provided in a state where the terminal portions of the transparent electrode 1 and the counter electrode 5a in the organic EL element 100 are exposed.
  • a desired organic EL element is obtained on the transparent substrate 13.
  • the transparent electrode 1 as an anode has a positive polarity and the counter electrode 5a as a cathode has a negative polarity, and the voltage is about 2 to 40V.
  • Luminescence can be observed by applying.
  • An alternating voltage may be applied.
  • the alternating current waveform to be applied may be arbitrary.
  • the organic EL element 100 described above has a configuration in which the transparent electrode 1 having both conductivity and light transmittance according to the present invention is used as an anode, and a light emitting functional layer 3 and a counter electrode 5a serving as a cathode are provided on the transparent electrode 1. is there. For this reason, the extraction efficiency of the emitted light h from the transparent electrode 1 side is improved while applying a sufficient voltage between the transparent electrode 1 and the counter electrode 5a to realize high luminance light emission in the organic EL element 100. Therefore, it is possible to increase the luminance. Further, it is possible to improve the light emission life by reducing the drive voltage for obtaining a predetermined luminance.
  • FIG. 9 is a schematic cross-sectional view showing a second example of an organic EL element using the transparent electrode 1 described above as an example of the electronic device of the present invention.
  • the organic EL element 200 of the second example shown in FIG. 9 is different from the organic EL element 100 of the first example shown in FIG. 8 in that the transparent electrode 1 is used as a cathode.
  • the transparent electrode 1 is used as a cathode.
  • the organic EL element 200 is provided on the transparent substrate 13, and the transparent electrode 1 of the present invention described above is used as the transparent electrode 1 on the transparent substrate 13 as in the first example. ing. For this reason, the organic EL element 200 is configured to extract the emitted light h from at least the transparent substrate 13 side.
  • the transparent electrode 1 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 example.
  • an electron injection layer 3e / electron transport layer 3d / light emitting layer 3c / hole transport layer 3b / hole injection layer 3a are arranged in this order on the transparent electrode 1 functioning as a cathode.
  • a stacked configuration is exemplified. However, it is essential to have at least the light emitting layer 3c made of an organic material.
  • the light emitting functional layer 3 adopts various configurations as required in the same manner as described in the first example. In such a configuration, only the portion where the light emitting functional layer 3 is sandwiched between the transparent electrode 1 and the counter electrode 5 b becomes the light emitting region in the organic EL element 200 as in the first example.
  • the auxiliary electrode 15 may be provided in contact with the conductive layer 1b of the transparent electrode 1 for the purpose of reducing the resistance of the transparent electrode 1. Similar to the example.
  • the counter electrode 5b used as the anode is made 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 of these conductive materials by a method such as vapor deposition or sputtering. Further, the sheet resistance value as the counter electrode 5b 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 200 is comprised so that emitted light h can be taken out also from the counter electrode 5b side, as a material which comprises the counter electrode 5b, favorable light transmittance is mentioned among the electrically conductive materials mentioned above.
  • a suitable conductive material is selected and used.
  • the organic EL element 200 having the above configuration is sealed with the sealing material 17 in the same manner as in the first example for the purpose of preventing deterioration of the light emitting functional layer 3.
  • the detailed structure of the constituent elements other than the counter electrode 5b used as the anode and the method for manufacturing the organic EL element 200 are the same as in the first example. Therefore, detailed description is omitted.
  • the organic EL element 200 described above has a configuration in which the transparent electrode 1 having both conductivity and light transmittance according to the present invention is used as a cathode, and the light emitting functional layer 3 and the counter electrode 5b serving as an anode are provided on the transparent electrode 1. is there. For this reason, as in the first example, a sufficient voltage is applied between the transparent electrode 1 and the counter electrode 5b to realize high-luminance light emission in the organic EL element 200, and light emitted from the transparent electrode 1 side. It is possible to increase the luminance by improving the extraction efficiency of h. Further, it is possible to improve the light emission life by reducing the drive voltage for obtaining a predetermined luminance.
  • FIG. 10 is a schematic cross-sectional view showing a third example of the organic EL element using the transparent electrode 1 described above as an example of the electronic device of the present invention.
  • the organic EL element 300 of the third example shown in FIG. 10 is different from the organic EL element 100 of the first example shown in FIG. 8 in that a counter electrode 5c is provided on the substrate 131 side, and the light emitting functional layer 3 and It is in the place which laminated
  • the detailed description of the same components as those in the first example will be omitted, and the characteristic configuration of the organic EL element 300 in the third example will be described.
  • An organic EL element 300 shown in FIG. 10 is provided on a substrate 131, and from the substrate 131 side, an opposing electrode 5c serving as an anode, a light emitting functional layer 3, and a transparent electrode 1 serving as a cathode are laminated in this order. .
  • the transparent electrode 1 of the present invention described above is used as the transparent electrode 1.
  • the organic EL element 300 is configured to extract the emitted light h from at least the transparent electrode 1 side opposite to the substrate 131.
  • the layer structure of the organic EL element 300 configured as described above is not limited to the example described below, and may be a general layer structure as in the first example.
  • a configuration in which a hole injection layer 3a / a hole transport layer 3b / a light emitting layer 3c / an electron transport layer 3d are stacked in this order on the counter electrode 5c functioning as an anode is illustrated. Is done. However, it is essential to have at least the light emitting layer 3c configured using an organic material.
  • the electron transport layer 3d also serves as the electron injection layer 3e, and is provided as an electron transport layer 3d having electron injection properties.
  • the characteristic structure of the organic EL element 300 of the third example is that an electron transport layer 3d having an electron injection property is provided as an intermediate layer 1a in the transparent electrode 1. That is, in the third example, the transparent electrode 1 used as a cathode is composed of an intermediate layer 1a also serving as an electron transporting layer 3d having electron injecting properties, and a conductive layer 1b provided thereon. Is.
  • Such an electron transport layer 3d is configured by using the material constituting the intermediate layer 1a of the transparent electrode 1 described above.
  • the light emitting functional layer 3 adopts various configurations as necessary, as described in the first example.
  • the electron transport also serving as the intermediate layer 1a of the transparent electrode 1 is used.
  • No electron injection layer or hole blocking layer is provided between the layer 3d and the conductive layer 1b of the transparent electrode 1. In the configuration as described above, only the portion where the light emitting functional layer 3 is sandwiched between the transparent electrode 1 and the counter electrode 5c becomes the light emitting region in the organic EL element 300, as in the first example.
  • the auxiliary electrode 15 may be provided in contact with the conductive layer 1b of the transparent electrode 1 for the purpose of reducing the resistance of the transparent electrode 1. The same as in the example.
  • the counter electrode 5c 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 5c configured as described above can be produced by forming a thin film of these conductive materials by a method such as vapor deposition or sputtering. Further, the sheet resistance value as the counter electrode 5c 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 300 is comprised so that the emitted light h can be taken out also from the counter electrode 5c side, as a material which comprises the counter electrode 5c, light transmittance is favorable among the electrically conductive materials mentioned above.
  • a suitable conductive material is selected and used.
  • the substrate 131 is the same as the transparent substrate 13 described in the first example, and the surface facing the outside of the substrate 131 is the light extraction surface 131a.
  • the electron transporting layer 3d having the electron injecting property constituting the uppermost part of the light emitting functional layer 3 is used as the intermediate layer 1a, and the conductive layer 1b is provided on the upper layer, thereby providing the intermediate layer 1a
  • the transparent electrode 1 composed of the upper conductive layer 1b is provided as a cathode.
  • a sufficient voltage is applied between the transparent electrode 1 and the counter electrode 5c to realize high-luminance light emission in the organic EL element 300, while the transparent electrode 1 side. It is possible to increase the luminance by improving the extraction efficiency of the emitted light h from the light source. Further, it is possible to improve the light emission life by reducing the drive voltage for obtaining a predetermined luminance. Further, when the counter electrode 5c is light transmissive, the emitted light h can be extracted from the counter electrode 5c.
  • the intermediate layer 1a of the transparent electrode 1 has been described as also serving as the electron transport layer 3d having electron injection properties.
  • the present example is not limited to this, and the intermediate layer 1a may also serve as an electron transport layer 3d that does not have electron injection properties, or the intermediate layer 1a may serve as an electron injection layer instead of an electron transport layer.
  • the intermediate layer 1a may be formed as an extremely thin film that does not affect the light emitting function of the organic EL element. In this case, the intermediate layer 1a has electron transport properties and electron injection properties. Not.
  • the intermediate layer 1a of the transparent electrode 1 is formed as an extremely thin film that does not affect the light emitting function of the organic EL element
  • the counter electrode 5c on the substrate 131 side is used as a cathode
  • the light emitting functional layer 3 may be an anode.
  • the light emitting functional layer 3 is formed in order from the counter electrode (cathode) 5c side on the substrate 131, for example, an electron injection layer 3e / electron transport layer 3d / light emitting layer 3c / hole transport layer 3b / hole injection layer 3a. Are stacked.
  • a transparent electrode 1 having a laminated structure of an extremely thin intermediate layer 1a and a conductive layer 1b is provided as an anode on the top.
  • organic EL elements are surface light emitters as described above, they can be used as various light emission 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. In particular, 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 of the present invention may be used as a kind of lamp for illumination or exposure light source, a projection device for projecting an image, or a type for directly viewing a still image or a moving image. It may be used as a display device (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.
  • a lighting device will be described as an example of the application, and then a lighting device having a light emitting surface enlarged by tiling will be described.
  • Lighting device-1 The illuminating device can comprise the organic EL element.
  • the organic EL element used in the lighting device 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.
  • the combination of a plurality of emission colors may include three emission maximum wavelengths of the three primary colors of red, green, and blue, or two of the complementary colors such as blue and yellow, blue green and orange, etc. The thing containing the light emission maximum wavelength may be used.
  • the combination of luminescent materials for obtaining multiple luminescent colors is a combination of multiple phosphorescent or fluorescent materials that emit light, fluorescent materials or phosphorescent materials, and light from the luminescent 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.
  • a light emitting material used for the light emitting layer of such a white organic EL element For example, if it is a backlight in a liquid crystal display element, it will adapt to the wavelength range corresponding to CF (color filter) characteristic.
  • any one of the above metal complexes and known light emitting materials may be selected and combined to be whitened.
  • the white organic EL element described above it is possible to produce a lighting device that emits substantially white light.
  • FIG. 11 is a schematic cross-sectional view of an illuminating device having a large light emitting surface using a plurality of organic EL elements having the above-described configurations.
  • the lighting device 21 has a light emitting surface having a large area by arranging (tiling) a plurality of light emitting panels 22 including the organic EL elements 100 on the transparent substrate 13 on the support substrate 23. This is a structured.
  • the support substrate 23 may also serve as the sealing material 17, and each light-emitting panel 22 is tied with the organic EL element 100 sandwiched between the support substrate 23 and the transparent substrate 13 of the light-emitting panel 22. Ring.
  • An adhesive 19 may be filled between the support substrate 23 and the transparent substrate 13, thereby sealing the organic EL element 100.
  • the edge part of the transparent electrode 1 which is an anode, and the counter electrode 5a which is a cathode are exposed around the light emission panel 22.
  • FIG. only the exposed portion of the counter electrode 5a is shown in FIG.
  • the hole injection layer 3a / hole transport layer 3b / light emission layer 3c / electron transport layer 3d / electron injection layer 3e are formed on the transparent electrode 1.
  • a configuration in which the layers are sequentially stacked is shown as an example.
  • the center of each light emitting panel 22 is a light emitting area A, and a non-light emitting area B is generated between the light emitting panels 22.
  • a light extraction member for increasing the light extraction amount from the non-light-emitting region B may be provided in the non-light-emitting region B of the light extraction surface 13a.
  • a light collecting sheet or a light diffusion sheet can be used as the light extraction member.
  • the transparent electrodes 1 to 47 were produced so that the area of the conductive region was 5 cm ⁇ 5 cm.
  • the transparent electrodes 1 to 4 were prepared as transparent electrodes having a single layer structure composed of only a conductive layer, and the transparent electrodes 5 to 47 were prepared as transparent electrodes having a laminated structure of an intermediate layer and a conductive layer.
  • a transparent non-alkali glass substrate was fixed to a substrate holder of a commercially available vacuum deposition apparatus and attached to a vacuum chamber of the vacuum deposition apparatus. Moreover, the resistance heating boat made from tungsten was filled with silver (Ag), and was attached in the said vacuum chamber. Next, after depressurizing the vacuum chamber to 4 ⁇ 10 ⁇ 4 Pa, the resistance heating boat is energized and heated, and the layer thickness is 5 nm on the substrate within the range of the deposition rate of 0.1 to 0.2 nm / second. A conductive layer made of silver was formed to produce a transparent electrode 1 having a single layer structure.
  • Transparent electrodes 2 to 4 were produced in the same manner as the production of the transparent electrode 1, except that the thickness of the conductive layer was changed to 8 nm, 10 nm, and 15 nm, respectively.
  • the first vacuum chamber is depressurized to 4 ⁇ 10 ⁇ 4 Pa, and then heated by energizing the heating boat containing ET-1, and the deposition rate is in the range of 0.1 to 0.2 nm / second.
  • an intermediate layer made of ET-1 having a layer thickness of 20 nm was provided on the substrate.
  • the base material formed up to the intermediate layer is transferred to the second vacuum chamber while being vacuumed, and after the pressure in the second vacuum chamber is reduced to 4 ⁇ 10 ⁇ 4 Pa, the heating boat containing silver is energized and heated.
  • a conductive layer made of silver having a layer thickness of 8 nm was formed within a deposition rate range of 0.1 to 0.2 nm / second, and a transparent electrode 6 having a laminated structure of an intermediate layer and a conductive layer was produced.
  • Transparent electrodes 7 to 10 were produced in the same manner as the production of the transparent electrode 6, except that the constituent material of the intermediate layer was changed to ET-2 to ET-5 shown in the following structural formulas. Was made.
  • a transparent non-alkali glass base material is fixed to a base material holder of a commercially available vacuum deposition apparatus, and the exemplary compound (1) of the present invention is filled in a resistance heating boat made of tantalum.
  • the substrate holder and the heating boat were attached to the first vacuum chamber of the vacuum deposition apparatus.
  • the resistance heating boat made from tungsten was filled with silver, and it attached in the 2nd vacuum chamber.
  • the first vacuum chamber was depressurized to 4 ⁇ 10 ⁇ 4 Pa, and then heated by energizing the heating boat containing the exemplary compound (1), and the deposition rate was 0.1 to 0.2 nm / second. In this range, an intermediate layer made of the exemplified compound (1) having a layer thickness of 20 nm was provided on the substrate.
  • the base material formed up to the intermediate layer is transferred to the second vacuum chamber while being vacuumed, and after the pressure in the second vacuum chamber is reduced to 4 ⁇ 10 ⁇ 4 Pa, the heating boat containing silver is energized and heated. Then, a conductive layer made of silver having a layer thickness of 5 nm was formed within the range of the deposition rate of 0.1 to 0.2 nm / second, and a transparent electrode 11 having a laminated structure of an intermediate layer and a conductive layer was produced.
  • Transparent electrodes 12 to 14 were produced in the same manner as the production of the transparent electrode 11, except that the thickness of the conductive layer was changed to 8 nm, 10 nm, and 20 nm, respectively.
  • Transparent electrodes 15 to 44 were produced in the same manner as the production of the transparent electrode 12, except that the constituent material of the intermediate layer was changed to the exemplified compounds shown in Tables 1 and 2.
  • Transparent electrodes 38, 41, and 44 were produced in the same manner except that the base material was changed from non-alkali glass to PET (polyethylene terephthalate) film. Was made.
  • silver (Ag) is the main component on the intermediate layer using an organic compound whose LUMO energy level is in the range of -2.2 to -1.6 eV.
  • Each of the transparent electrodes 11 to 47 of the present invention provided with the conductive layer described above has a light transmittance of 52% or more and a sheet resistance value of 10.2 ⁇ / ⁇ or less.
  • some of the transparent electrodes 1 to 10 of the comparative example had a light transmittance of less than 52% and a sheet resistance value of more than 10.2 ⁇ / ⁇ .
  • the transparent electrodes 11 to 47 of the present invention are superior to the transparent electrodes 1 to 10 of the comparative example.
  • the transparent electrode of the present invention has high light transmittance and conductivity and is excellent in durability.
  • Example 1 the transparent substrate 13 produced in Example 1 on which the transparent electrode 1 having only the conductive layer 1b was formed was fixed to a substrate holder of a commercially available vacuum deposition apparatus. A vapor deposition mask was disposed opposite to the formation surface side of the transparent electrode 1. Moreover, each material which comprises the light emission functional layer 3 was filled in each heating boat in a vacuum evaporation system in the optimal quantity for film-forming of each layer. In addition, the heating boat used what was produced with the resistance heating material made from tungsten.
  • each layer was formed as follows by sequentially energizing and heating a heating boat containing each material.
  • a hole-injecting hole transporting material serving as both a hole-injecting layer and a hole-transporting layer made of ⁇ -NPD is heated by energizing a heating boat containing ⁇ -NPD represented by the following structural formula as a hole-transporting injecting material.
  • the layer 31 was formed on the conductive layer 1 b constituting the transparent electrode 1. At this time, 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 compound Ir-4 are energized independently to emit light composed of the host material H4 and the phosphorescent compound Ir-4.
  • the layer 3c was formed on the hole transport injection layer 31.
  • the layer thickness was 30 nm.
  • a hole-blocking layer 33 made of BAlq was formed on the light-emitting layer 3c by heating by heating a heating boat containing BAlq represented by the following structural formula as a hole-blocking material.
  • the deposition rate was 0.1 to 0.2 nm / second, and the layer thickness was 10 nm.
  • an electron transport material composed of ET-6 and potassium fluoride was supplied to the heating boat containing ET-6 represented by the following structural formula and the heating boat containing potassium fluoride as the electron transporting material independently.
  • 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 13 formed up to the electron injection layer 3e was 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 as a counter electrode material was attached while maintaining the vacuum state. Then, in the processing chamber, a film was formed at a film forming 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. As described above, the organic EL element 400 was formed on the transparent substrate 13.
  • the organic EL element 400 is covered with a sealing material 17 made of a glass substrate having a thickness of 300 ⁇ m, and the adhesive 19 (sealing material) is interposed between the sealing material 17 and the transparent substrate 13 so as to surround the organic EL element 400. ).
  • a sealing material 17 made of a glass substrate having a thickness of 300 ⁇ m
  • the adhesive 19 (sealing material) is interposed between the sealing material 17 and the transparent substrate 13 so as to surround the organic EL element 400. ).
  • 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 and seal the organic EL element 400. Stopped.
  • the organic EL element 400 In forming the organic EL element 400, an evaporation mask is used for forming each layer, and the central 4.5 cm ⁇ 4.5 cm of the 5 cm ⁇ 5 cm transparent substrate 13 is defined as the light emitting region A, and the entire circumference of the light emitting region A is formed. A non-light emitting region B having a width of 0.25 cm was provided. Further, the transparent electrode 1 serving as the anode and the counter electrode 5a serving as the cathode are insulated by the light emitting functional layer 3 from the hole transport injection layer 31 to the electron injection layer 3e, and a terminal portion is provided on the periphery of the transparent substrate 13. Was formed in a drawn shape.
  • a light emitting panel 1-1 as a sample of the light emitting panel 22 in which the organic EL element 400 was provided on the transparent substrate 13 and sealed with the sealing material 17 and the adhesive 19 was manufactured.
  • the emitted light h of each color generated in the light emitting layer 3c is extracted from both the transparent electrode 1 side, that is, the transparent substrate 13 side, and the counter electrode 5a side, that is, the sealing material 17 side.
  • the produced light emitting panels 1-1 to 1-47 were measured for light transmittance, driving voltage, and durability (luminance half-life) according to the following method.
  • each of the light emitting panels 1-11 to 1-47 of the present invention using the transparent electrode of the present invention as the anode of the organic EL device has a light transmittance of 52%.
  • the driving voltage is suppressed to 3.6 V or less.
  • the light emitting panels 1-1 to 1-10 using the transparent electrode of the comparative example as the anode of the organic EL element have a light transmittance of less than 52%, and even when a voltage is applied. Some of them did not emit light, or even when they emitted light, the driving voltage exceeded 3.6V.
  • durability luminance half-life
  • the light emitting panel using the transparent electrode of the present invention can emit light with high luminance at a low driving voltage.
  • the driving voltage for obtaining the predetermined luminance can be reduced and the light emission life can be improved.
  • Double-sided light emitting panels 2-1 to 2-47 using a transparent electrode made of the compound of the present invention as a cathode were prepared.
  • the manufacturing procedure will be described with reference to FIG.
  • the transparent substrate 131 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 counter electrode 5c. Moreover, each material which comprises the light emission functional layer 3 was filled in each heating boat in a vacuum evaporation system in the optimal quantity for film-forming of each layer. 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.
  • a heating boat containing ⁇ -NPD as a hole transport injecting material is energized and heated, and the hole transport injecting layer 31 serving as both a hole injecting layer and a hole transport layer made of ⁇ -NPD is opposed to A film was formed on the electrode 5c.
  • 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 compound Ir-4 are energized independently to emit light composed of the host material H4 and the phosphorescent compound Ir-4.
  • the layer 3c was formed on the hole transport injection layer 31.
  • the layer thickness was 30 nm.
  • a heating boat containing BAlq as a hole blocking material was energized and heated to form a hole blocking layer 33 made of BAlq on the light emitting layer 3c.
  • the deposition rate was 0.1 to 0.2 nm / second, and the layer thickness was 10 nm.
  • a heating boat containing ET-6 as a material for the electron transport layer was energized, and an electron transport layer 3d made of ET-6 was formed on the hole blocking layer 33.
  • the deposition rate was 0.1 to 0.2 nm / second, and the layer thickness was 30 nm.
  • a heating boat containing lithium fluoride (LiF) as an electron injection material was energized and heated, and an electron injection layer 3e made of potassium fluoride was formed on the electron transport layer 3d.
  • the deposition rate was 0.01 to 0.02 nm / second, and the layer thickness was 5 nm.
  • the transparent substrate 131 formed up to the electron injection layer 3e is filled with silver (Ag) from a vapor deposition chamber of a vacuum vapor deposition apparatus into a tungsten resistance heating boat as a transparent electrode (conductive layer) material. It was transferred into the tank while maintaining the vacuum state.
  • the resistance heating boat is energized and heated, and the layer is formed on the electron injection layer 3e within a deposition rate range of 0.1 to 0.2 nm / second.
  • a conductive layer 1b made of silver having a thickness of 5 nm was formed as a cathode.
  • the organic EL element 500 was formed on the transparent substrate 131.
  • the organic EL element 500 is covered with a sealing material 17 made of a glass substrate having a thickness of 300 ⁇ m, and the adhesive 19 (sealing material) is interposed between the sealing material 17 and the transparent substrate 131 so as to surround the organic EL element 500. ).
  • a sealing material 17 made of a glass substrate having a thickness of 300 ⁇ m
  • the adhesive 19 (sealing material) is interposed between the sealing material 17 and the transparent substrate 131 so as to surround the organic EL element 500. ).
  • 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 and seal the organic EL element 500. Stopped.
  • a vapor deposition mask is used for forming each layer, and the central 4.5 cm ⁇ 4.5 cm of the 5 cm ⁇ 5 cm transparent substrate 131 is defined as the light emitting region A, and the entire circumference of the light emitting region A is formed.
  • a non-light emitting region B having a width of 0.25 cm was provided.
  • the counter electrode 5c as the anode and the transparent electrode 1 as the cathode are insulated by the light emitting functional layer 3 from the hole transport injection layer 31 to the electron injection layer 3e, and a terminal portion is provided on the periphery of the transparent substrate 131.
  • the organic EL element 500 was provided on the transparent substrate 131, and the light emitting panel 2-1 was sealed with the sealing material 17 and the adhesive 19.
  • the emitted light h of each color generated in the light emitting layer 3c is taken out from both the counter electrode 5c side, that is, the transparent substrate 131 side, and the transparent electrode 1 side, that is, the sealing material 17 side.
  • Light-Emitting Panel 2 was prepared in the same manner except that the thickness of the conductive layer was changed to 8.5 nm, 10 nm, and 15 nm, respectively. -2 to 2-4 were produced.
  • a light-emitting panel 2-5 was produced in the same manner as in the production of the light-emitting panel 2-2, except that the electron injection layer 3e was formed as follows. Hereinafter, the electron injection layer 3e will be described as the intermediate layer 1a.
  • Fabrication of light-emitting panel 2-11 Patterning was performed on a substrate (NA-45, manufactured by AvanState Co., Ltd.) in which ITO (indium tin oxide) 100 nm was formed as an anode on a glass substrate 131 of 100 mm ⁇ 100 mm ⁇ 1.1 mm. Went. Thereafter, the transparent support substrate 131 provided with the ITO transparent electrode (counter electrode 5c) was ultrasonically cleaned with isopropyl alcohol, dried with dry nitrogen gas, and subjected to UV ozone cleaning for 5 minutes.
  • ITO indium tin oxide
  • the transparent substrate 131 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 counter electrode 5c. Moreover, each material which comprises the light emission functional layer 3 was filled in each heating boat in a vacuum evaporation system in the optimal quantity for film-forming of each layer. In addition, the heating boat used what was produced with the resistance heating material made from tungsten.
  • each layer was formed as follows by sequentially energizing and heating a heating boat containing each material.
  • a heating boat containing ⁇ -NPD as a hole transport injecting material is energized and heated, and the hole transport injecting layer 31 serving as both a hole injecting layer and a hole transport layer made of ⁇ -NPD is opposed to A film was formed on the electrode 5c.
  • 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 compound Ir-4 are energized independently to emit light composed of the host material H4 and the phosphorescent compound Ir-4.
  • the layer 3c was formed on the hole transport injection layer 31.
  • the layer thickness was 30 nm.
  • a heating boat containing BAlq as a hole blocking material was energized and heated to form a hole blocking layer 33 made of BAlq on the light emitting layer 3c.
  • the deposition rate was 0.1 to 0.2 nm / second, and the layer thickness was 10 nm.
  • a heating boat containing ET-6 as a material for the electron transport layer was energized, and an electron transport layer 3d made of ET-6 was formed on the hole blocking layer 33.
  • the deposition rate was 0.1 to 0.2 nm / second, and the layer thickness was 30 nm.
  • the heating boat containing the exemplary compound (1) as the material of the intermediate layer 1a which also serves as the electron injection layer and the heating boat containing lithium fluoride were energized independently, and the exemplary compound (1) and the fluorine An intermediate layer 1a made of lithium fluoride was formed on the electron transport layer 3d.
  • the layer thickness was 5 nm.
  • the transparent substrate 131 formed up to the intermediate layer 1a is filled with silver (Ag) in a resistance heating boat made of tungsten as a transparent electrode (conductive layer) material from the vapor deposition chamber of the vacuum vapor deposition apparatus. It was transferred while keeping the vacuum state.
  • the resistance heating boat is energized and heated, and the layer thickness is deposited on the intermediate layer 1a within the deposition rate range of 0.1 to 0.2 nm / second.
  • a conductive layer 1b made of 5 nm silver was used as a cathode.
  • the organic EL element 500 was formed on the transparent substrate 131.
  • the organic EL element 500 is covered with a sealing material 17 made of a glass substrate having a thickness of 300 ⁇ m, and the adhesive 19 (sealing material) is interposed between the sealing material 17 and the transparent substrate 131 so as to surround the organic EL element 500. ).
  • a sealing material 17 made of a glass substrate having a thickness of 300 ⁇ m
  • the adhesive 19 (sealing material) is interposed between the sealing material 17 and the transparent substrate 131 so as to surround the organic EL element 500. ).
  • 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 and seal the organic EL element 500. Stopped.
  • a vapor deposition mask is used for forming each layer, and the central 4.5 cm ⁇ 4.5 cm of the 5 cm ⁇ 5 cm transparent substrate 131 is defined as the light emitting region A, and the entire circumference of the light emitting region A is formed.
  • a non-light emitting region B having a width of 0.25 cm was provided.
  • the counter electrode 5c as the anode and the transparent electrode 1 as the cathode are insulated by the light emitting functional layer 3 from the hole transport injection layer 31 to the electron injection layer 3e, and a terminal portion is provided on the periphery of the transparent substrate 131.
  • a light emitting panel 2-11 in which the organic EL element 500 was provided on the transparent substrate 131 and sealed with the sealing material 17 and the adhesive 19 was produced.
  • the emitted light h of each color generated in the light emitting layer 3c is extracted from both the counter electrode 5c side, that is, the transparent substrate 131 side, and the transparent electrode 1 side, that is, the sealing material 17 side.
  • the light-emitting panels 2-11 to 2-47 of the present invention using the transparent electrode of the present invention as the cathode of the organic EL device all have a light transmittance of 53%.
  • the driving voltage is suppressed to 3.6 V or less.
  • the light emitting panels 2-1 to 2-10 using the transparent electrode of the comparative example as the cathode of the organic EL element have a light transmittance of less than 53%, and a voltage is applied. No light was emitted or even when light was emitted, the driving voltage exceeded 3.6V.
  • durability luminance half-life
  • the light emitting panel using the transparent electrode of the present invention can emit light with high luminance at a low driving voltage.
  • the driving voltage for obtaining the predetermined luminance can be reduced and the light emission life can be improved.
  • the present invention is particularly suitably used for providing a transparent electrode having sufficient conductivity and light transmittance and having excellent durability, an electronic device including the transparent electrode, and an organic EL element. it can.

Abstract

La présente invention a pour but de résoudre le problème consistant à fournir une électrode transparente ayant une conductivité et une transparence optique adéquate ainsi qu'une excellente durabilité. L'électrode transparente (1) de la présente invention comprend une couche conductrice (1b) et une couche intermédiaire (1a) disposée de manière adjacente à la couche conductrice (1b), et est caractérisée en ce que la couche conductrice (1b) est conçue avec comme constituant principal de l'argent et en ce que la couche intermédiaire (1a) contient un composé organique dans lequel le niveau d'énergie LUMO est compris dans la plage allant de -2,2 à -1,6 eV.
PCT/JP2013/075983 2012-10-22 2013-09-26 Électrode transparente, dispositif électronique et élément organique électroluminescent WO2014065073A1 (fr)

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