WO2017196076A2 - 유기 전계 발광 소자 및 이의 제조 방법 - Google Patents
유기 전계 발광 소자 및 이의 제조 방법 Download PDFInfo
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Definitions
- the present specification relates to a method of manufacturing an organic electroluminescent device and an organic electroluminescent device manufactured thereby.
- the organic light emitting phenomenon is an example of converting an electric current into visible light by an internal process of a specific organic molecule.
- the principle of the organic light emitting phenomenon is as follows. When the organic layer is positioned between the anode and the cathode, when a current is applied between the two electrodes, electrons and holes are injected into the organic layer from the cathode and the anode, respectively. The electrons and holes injected into the organic layer recombine to form excitons, which then fall back to the ground to shine.
- An organic electroluminescent device using this principle may generally be composed of an organic material layer including a cathode, an anode, and an organic material layer disposed therebetween, such as a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer.
- the material of the lower layer may be dissolved again by the solvent or ink used in the solution process to cause mixing with the upper layer or physically damage the thin film.
- a process of preparing the solvent used in each layer so that they cannot be dissolved in each other, or the lower layer may not be dissolved when forming the upper layer through post-treatment to the lower layer may be added.
- the most commonly used hole injection layer material is a conductive polymer. They are not high in their solubility and are mainly in the form of aqueous solutions, and thus have different solvent characteristics from the organic solvents used in the upper layer, thereby ensuring a certain degree of fairness. In addition, when these are used, they appear to show a relatively low drive voltage. However, they are mainly characterized by damaging the electrode material of the lower layer by using an acidic dopant material having a low pH, which has the disadvantage that the life characteristics are lowered.
- the present specification is to provide a composition for coating a hole injection or transport layer or a charge generating layer that can be used when manufacturing the organic electroluminescent device by a solution process, to provide a method of manufacturing an organic electroluminescent device using the same, and an organic electroluminescent device manufactured thereby do.
- Organometallic complexes comprising at least one of Group 5, Group 6 and Group 7 transition metals
- Organometallic complexes or metal salts comprising at least one of Group 1, Group 8, Group 11 and Group 12 metals;
- It provides a hole injection or transport layer or charge generating layer coating composition of the organic electroluminescent device comprising a.
- a first electrode Second electrode; And one or more organic material layers provided between the first electrode and the second electrode.
- An organic electroluminescence further comprising a hole injection or transport layer or a charge generating layer comprising a metal oxide comprising at least one of Group 5, Group 6 and Group 7 transition metals and at least one of Group 1, Group 8, Group 11 and Group 12 metals.
- a hole injection or transport layer or a charge generating layer comprising a metal oxide comprising at least one of Group 5, Group 6 and Group 7 transition metals and at least one of Group 1, Group 8, Group 11 and Group 12 metals.
- a first electrode Second electrode; And one or more organic material layers provided between the first electrode and the second electrode.
- a hole injection or transport layer provided between the first electrode and the organic material layer, between the second electrode and the organic material layer, or between the organic material layers when two or more organic material layers are present and formed using the coating composition according to the above-described embodiment or It provides an organic electroluminescent device further comprising a charge generating layer.
- At least one of Group 1, Group 8, Group 11 and Group 12 metals of Group 5, 6 or 7 transition metals as described above for the formation of a hole injection or transport layer or a charge generating layer of the organic electroluminescent device can change the work function of the layer formed using them to vary the charge injection properties.
- the solvent is removed during the drying process after coating, and the organic ligand of the organic metal complex reacts with oxygen in the air during the heat treatment to decompose and remove the final doped metal. Since it exists in the form of an oxide, it is possible to minimize the deterioration of device characteristics due to residual organic materials, and in particular, to obtain an organic light emitting device having a long life.
- the central metal element reacts with oxygen in the air to generate MOM bonds, thereby forming MO 3 , for example, MoO 3 or WO 3 , V 2 O 5.
- the hole injection or transport layer or the charge generating layer made of the metal oxide is increased by the above-mentioned doping effect and the charge concentration and charge mobility in the entire metal oxide thin film are increased, and the driving voltage increases even when the thickness is increased to 30 nm or more. It does not appear.
- the metal and the organic ligand in the organometallic complex are broken and bond with the oxygen atoms present at the interface of ITO to form a bond such as Metal-O-In or Metal-O-Sn.
- the mechanical strength of the thin film is increased and the interface property is improved, so that charge transfer therebetween can occur smoothly.
- the thin film formation characteristics after coating are superior to the case of using an aqueous solution in which the metal oxide powder itself such as MoO 3 or V 2 O 5 is dissolved by adding H 2 O 2 or NH 4 OH or the like.
- a mass production process such as an inkjet may be enabled, and device properties may be improved by excluding residual moisture.
- a suitable viscosity and coating property are good. It can be prepared in ink, and it is advantageous to use this to prepare a hole injection or transport layer or a charge generating layer by a coating method.
- FIG. 1 illustrates an example of an organic EL device according to an exemplary embodiment of the present specification.
- Figure 2 shows the XPS results that can confirm the Mo-Mo bonds when forming a thin film using the coating composition according to an embodiment of the present invention.
- One embodiment of the present specification is an organometallic complex comprising at least one of Group 5, Group 6 and Group 7 transition metal; Organometallic complexes or metal salts comprising at least one of Group 1, Group 8, Group 11 and Group 12 metals; And it provides a hole injection or transport layer or charge generating layer coating composition of the organic electroluminescent device comprising an organic solvent.
- the Group 5, 6, or 7 transition metals and the Group 1, 8, 11, and 12 metals have different oxides of the metals and different work functions of these oxides. As a result, the work function of the final thin film is changed. Therefore, it is possible to vary the work function by adjusting the type and amount of the metal to be doped or mixed. As a result, matching between the hole transport layer, the light emitting layer, and the electron transport layer located in the upper layer may be performed to adjust the balance of holes and electrons in the device, thereby controlling long life and luminous efficiency.
- the organometallic complex comprising at least one of the Group 5, Group 6 or Group 7 transition metals may preferably comprise Mo, W, V or Re, more preferably Mo.
- the organometallic complex or metal salt comprising at least one of the Group 1, Group 8, Group 11 and Group 12 metals is an alkali metal such as Li, Na, K, Rb, Cs, and Fe, Ru, Os, Cu, Ag And transition metals such as Au, Zn, and Cd.
- the organometallic complex or metal salt comprising at least one of the Group 1, Group 8, Group 11 and Group 12 metals includes an alkali metal of Group 1 such as Li, Na, K, Rb or Cs, More preferably may include Na.
- the coating composition may comprise an organometallic complex comprising Mo, W, V or Re, and an organometallic complex or metal salt comprising Li, Na, K, Rb or Cs.
- the coating composition may include an organometallic complex comprising Mo, W, V or Re, and an organometallic complex or metal salt comprising Fe, Ru, Cu, Ag, Au or Zn.
- the organometallic complex including Mo, W, V, and Re preferably has sufficient organic part to have good solubility and good coating property if possible, but it is preferable that these ligands are removed to become metal oxides during heat treatment. It is preferred to have a ligand that is pyrolyzed at or below ⁇ .
- the precursor for the metal element mixed with these may have an organic complex of each element, for example, a ligand such as methoxide, ethoxide, isopropoxide, butoxide, acetate, acetylacetonate, or a halide or nitrate And sulfates may be used. However, it is preferable that the anion portions of these organic ligands and salts do not remain after the heat treatment.
- the coating composition may include an organometallic complex including Mo, W, V or Re, and an organometallic complex or metal salt including Cu.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including Na.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including Ag.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including Fe.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including Cs.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including Zn.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including Au.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including K.
- the coating composition may include an organometallic complex including Mo, W, V, or Re and an organometallic complex or metal salt including Rb.
- the coating composition may include an organometallic complex including Mo, W, V or Re and an organometallic complex or metal salt including Ru.
- the content ratio of the Group 5, 6, or 7 organometallic complexes in the coating composition is 0.01 to 50 wt%, and 1 is mixed with respect to the Group 5, 6, or 7 transition metal atom.
- the ratio of group 8, group 11, and group 12 metal elements is 0.01 to 50 at%.
- Group 5, 6 or 7 metals in the coating composition may be 50 to 99.99 at% of the total metal atoms.
- the organometallic complex and the metal salt may be a complex of -2 to +6 oxidized water.
- the organometallic complex comprises an organic ligand bound to the metals described above.
- the organic ligand is not particularly limited, but may be selected in consideration of solvent solubility, interfacial properties with adjacent organic material layers, and the like.
- the organic ligand carbonyl, acetyl group, acetylacetonate group, methyl acetoacetate group, ethyl aceto acetate group, thioacetate, isocyanate, cyanate, isocyanate, nitrate, hexanoate, citrate, halogen atom, etc. Can be mentioned.
- the organic ligand may also be a structure comprising an aromatic ring and / or a heterocycle, such as benzene, triphenylamine, fluorene, biphenyl, pyrene, anthracene, carbazole, phenylpyridine, trithiophene, phenyloxadia Sol, phenyltriazole, benzoimidazole, phenyltriazine, benzodiathiazine, phenylquinoxaline, phenylenevinylene, phenylsilol or a combination of these structures.
- benzene triphenylamine
- fluorene fluorene
- biphenyl pyrene
- anthracene carbazole
- phenylpyridine trithiophene
- phenyloxadia Sol phenyltriazole
- benzoimidazole phenyltriazine
- benzodiathiazine phenylquinoxaline
- the aromatic ring or heterocycle may have a substituent, for example, the substituent may be an alkyl group, a halogen atom, an alkoxy group, a cyano group, a nitro group, or the like.
- the alkyl group and the alkoxy group may be, for example, 1 to 12 carbon atoms.
- examples of the organic ligand include acetylacetonate (acac; acetylacetonate), ethylacetoacetate, methylacetoacetate, OPh, carbonyl, methoxy, ethoxy, propoxy, isopropoxy, and butane It may be an alkoxy or acetate series such as oxy, sec-butoxy, tert-butoxy, pentoxy, hexyloxy, heptyloxy, octyl oxy, ethylhexyloxy and the like, but is not limited thereto. It may also be a ligand in the form in which these and a halogen group are present together.
- the organometallic complex may include a metal oxide.
- the metal oxide may include a metal oxide including at least one of Group 5, Group 6, or Group 7 transition metals, or at least one of Group 1, Group 8, Group 11, and Group 12 metals.
- One organic ligand can be coordinated.
- organometallic complexes include W (CO) 6 , W (acac) 3 , Mo (CO) 6 , WO 2 Cl 2 , MoO 2 (acac) 2 , sodium nitrate, Zn (acac 2 ) iron acetate, cesium nitrate.
- V when the organometallic complex includes V, it may be VO (acac) 2 substituted with some oxygen or V (acac) 3 unsubstituted.
- even when the organometallic complex includes W it may be W (acac) 3 or partially oxidized WO (acac) 2 .
- the organometallic complex may be in the form of a combination of two or more different ligands.
- the organometallic complex may be molybdenum dichloride dioxide.
- the organic solvent may include at least one of a hydroxyl group and a ketone group.
- the organic solvent is an alcohol solvent.
- the organic solvent is a ketone solvent.
- the organic solvent having a hydroxy group or a ketone group may be acetone, methyl ethyl ketone, diethyl ketone, cyclohexanone, cyclopentanone, isophorone, acetylacetone, tetralone, ethylbenzoate , Methyl benzoate, butyl benzoate, ethyl acetate, ethyl acetoacetate, diethyl acetoacetate, methyl benzoate, ethyl benzoate, methanol, ethanol, propanol, isopropanol, butanol, sec-butanol, tert-butanol, pentanol, It may be cyclopentanol, hexanol, cyclo hexanol, heptanol, octanol and may be a solvent represented by the following general formula (1).
- n is an integer from 1 to 20
- l and m are each or simultaneously integers from 0 to 5
- R 1 , R 2 , R 3 and R 4 are each or simultaneously hydrogen atoms, carbon number 1
- the organic solvent has a boiling point of 350 ° C. or less.
- Specific examples include ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monopentyl ether, ethylene glycol monohexyl ether, and ethylene glycol dimethyl.
- the precursor after fabrication of the device, the precursor does not easily change to another oxidation state or material without chemically strong bonding with the above-mentioned organometallic complex, which is used as a precursor of the metal oxide. There is an advantage to make an oxide thin film that does not remain organic.
- the content of the organometallic complex including at least one of Group 5, Group 6 or Group 7 transition metal in the coating composition is preferably 0.01 to 50% by weight.
- the content of the organometallic complex or metal salt containing at least one of the Group 1, Group 8, Group 11 and Group 12 metal in the coating composition is 0.01 to the Group 5, Group 6 or Group 7 transition metal It may be from 50% by weight, preferably 1-20% by weight, more preferably 1-15% by weight.
- the coating composition may further include an additive in addition to the organometallic complex in order to improve properties such as coatability and viscosity.
- the additive may include a dispersant, a surfactant, a polymer, a binder, a crosslinker, an emulsifier, an antifoaming agent, a desiccant, a filler, an extender, a thickener, a film conditioner, an antioxidant, a flow agent, a smoothing additive, and a corrosion inhibitor It may include any one or more selected from.
- Another embodiment of the present specification relates to a method of manufacturing an organic electroluminescent device
- Coating methods for forming the hole injection or transport layer or the charge generating layer include, for example, spin coating, inkjet, nozzle printing, wet coating, spray coating, doctor blade coating, contact printing, upper feed reverse printing, lower feed reverse printing, It can be any one selected from the group consisting of nozzle feed reverse printing, gravure printing, micro gravure printing, reverse micro gravure printing, roll coating, slot die coating, capillary coating, jet deposition, spray deposition, preferably spin coating, ink jet coating Nozzle printing, and the like.
- the coating method may be performed by coating the above-described composition on the first electrode or the second electrode and then drying. Drying and heat treatment or post-drying heat treatment is possible in nitrogen or in the air, but it is advantageous to remove in solvents and organic ligands and to convert the organometallic complex into an oxide.
- the heat treatment may vary depending on the organometallic complex to be used, but it is preferable to proceed at 150 ° C or more and 300 ° C or less, preferably 200 ° C or more and 300 ° C or less.
- the coating composition is an organometallic complex comprising at least one of Group 5, Group 6 or Group 7 transition metal; And an organometallic complex or metal salt comprising at least one of Group 1, Group 8, Group 11 and Group 12 metals, wherein the heat treatment temperature of the hole injection or transport layer or the charge generating layer is achieved within the temperature range, It is possible to manufacture a device having excellent lifespan characteristics in the whole.
- the coating composition comprises an organometallic complex comprising at least one of Group 5, Group 6 or Group 7 transition metals; And lifespan characteristics of the device only at certain temperatures, when it comprises an organometallic complex or metal salt comprising a metal element belonging to a group other than Groups 1, 8, 11 and 12, in particular a Ti element Since this rises, it is difficult to manufacture a device having excellent life characteristics, and it is not possible to manufacture a device having excellent life characteristics throughout the process temperature.
- the thickness of the hole injection or transport layer or charge generating layer formed using the coating composition is 1 nm to 1,000 nm.
- the thickness of the hole injection or transport layer or charge generating layer formed using the coating composition is 1 nm to 1,000 nm.
- the thickness of the hole injection or transport layer or charge generating layer formed using the coating composition is 1 nm to 1,000 nm.
- the thickness of the charge injection or transport layer can be varied without deteriorating device characteristics, it is advantageous to provide optimized device characteristics by reducing restrictions on device structure and thickness change of the upper layer.
- the hole injection or transport layer provided by the present invention provides materials and devices that have no voltage rise with thickness.
- the manufacturing method further includes annealing after forming a hole injection or transport layer or a charge generation layer formed using the coating composition.
- the annealing may be carried out at a temperature of 150 ⁇ 250 °C, preferably 180 ⁇ 250 °C.
- the annealing is aimed at removing the organic ligand of the organometallic complex in the annealing process and converting it into a metal oxide. Therefore, the annealing is preferably at a high temperature enough to decompose the ligand of the organometallic complex. It is preferable that it is an atmosphere with.
- the material and manufacturing method of the remaining electrodes and the organic material layer may be made using those known in the art. Can be.
- the first electrode is an anode and the second electrode is a cathode.
- the second electrode is an anode and the first electrode is a cathode.
- the organic material layer includes a light emitting layer.
- the organic material layer may have a multi-layer structure, for example, a light emitting layer, a hole injection layer, a hole transport layer. At least one layer of an electron transport layer, an electron injection layer, an electron blocking layer and a hole blocking layer.
- a multi-layer structure for example, a light emitting layer, a hole injection layer, a hole transport layer. At least one layer of an electron transport layer, an electron injection layer, an electron blocking layer and a hole blocking layer.
- FIG. 1 illustrates an organic electroluminescence in which an anode 201, a hole injection layer 301, a hole transport layer 401, a light emitting layer 501, an electron transport layer 601, and a cathode 701 are sequentially stacked on a substrate 101.
- the structure of the device is illustrated.
- the hole injection layer 301 may be formed using the coating composition described above.
- FIG. 1 illustrates an organic electroluminescent device and is not limited thereto.
- the organic material layers may be formed of the same material or different materials.
- the organic EL device of the present specification may be manufactured by sequentially stacking an anode, an organic material layer, and a cathode on a substrate. At this time, by using a physical vapor deposition (PVD) method such as sputtering or e-beam evaporation, a metal or conductive metal oxide or an alloy thereof is deposited on the substrate to form an anode.
- PVD physical vapor deposition
- an organic material layer including a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer thereon, and then depositing a material that can be used as a cathode thereon.
- an organic EL device may be manufactured by sequentially depositing a cathode material, an organic material layer, and an anode material on a substrate.
- a solution process include, but are not limited to, printing methods such as inkjet printing, nozzle printing, offset printing, transfer printing or screen printing.
- the organic material layer is performed in a solution process, heat treatment or light treatment may be further performed as necessary.
- the heat treatment temperature and time may be selected according to the process conditions or the material used, for example, it may be performed for 1 minute to 1 hour at 85 °C to 300 °C.
- anode material a material having a large work function is generally preferred to facilitate hole injection into the organic material layer.
- anode materials that can be used in the present invention include metals such as vanadium, chromium, copper, zinc, gold or alloys thereof; Metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), indium gallium zinc oxide (IGZO), fluorine-doped tin oxide (FTO), indium zinc oxide (IZO); ZnO: Al or SnO 2 : Combination of metals and oxides such as Sb; Conductive polymers such as poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDOT), polypyrrole and polyaniline, and the like, but are not limited thereto.
- the cathode material is generally a material having a small work function to facilitate electron injection into the organic material layer.
- Specific examples of the cathode materials include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin and lead or alloys thereof; Multilayer structure materials such as LiF / Al or LiO 2 / Al, and the like, but are not limited thereto.
- the hole injection layer material has the ability to transport holes to the hole injection effect at the anode.
- a compound having an excellent hole injection effect with respect to the light emitting layer or the light emitting material, preventing migration of excitons generated in the light emitting layer to the electron injection layer or the electron injection material, and excellent in thin film formation ability is preferable.
- the highest occupied molecular orbital (HOMO) of the hole injection material is between the work function of the anode material and the HOMO of the surrounding organic material layer.
- hole injection material examples include metal porphyrin, oligothiophene, arylamine-based organic material, hexanitrile hexaazatriphenylene-based organic material, quinacridone-based organic material, and perylene-based Organic materials, anthraquinone, and polyaniline and polythiophene-based conductive polymers, but are not limited thereto.
- the hole transport layer is a layer that receives holes from the hole injection layer and transports holes to the light emitting layer.
- the hole transport material is a material capable of transporting holes from the anode or the hole injection layer to the light emitting layer.
- the material is suitable. Specific examples thereof include an arylamine-based organic material, a conductive polymer, and a block copolymer having a conjugated portion and a non-conjugated portion together, but are not limited thereto.
- the light emitting layer material is a material capable of emitting light in the visible region by transporting and combining holes and electrons from the hole transport layer and the electron transport layer, respectively, and a material having good quantum efficiency with respect to fluorescence or phosphorescence is preferable.
- Specific examples thereof include 8-hydroxyquinoline aluminum complex (Alq 3 ); Carbazole series compounds; Dimerized styryl compounds; BAlq; 10-hydroxybenzoquinoline-metal compound; Benzoxazole, benzthiazole and benzimidazole series compounds; Poly (p-phenylenevinylene) (PPV) -based polymers; Spiro compounds; Polyfluorene, rubrene and the like, but are not limited thereto.
- the light emitting layer may include a host material and a dopant material.
- the host material is a condensed aromatic ring derivative or a heterocyclic containing compound.
- the condensed aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, and fluoranthene compounds
- the heterocyclic containing compounds include carbazole derivatives, dibenzofuran derivatives and ladder types. Furan compounds, pyrimidine derivatives, and the like, but are not limited thereto.
- Dopant materials include aromatic amine derivatives, styrylamine compounds, boron complexes, fluoranthene compounds, metal complexes, and the like.
- the aromatic amine derivatives include condensed aromatic ring derivatives having a substituted or unsubstituted arylamino group, and include pyrene, anthracene, chrysene, and periplanthene having an arylamino group, and a styrylamine compound may be substituted or unsubstituted.
- At least one arylvinyl group is substituted with the substituted arylamine, and one or two or more substituents selected from the group consisting of an aryl group, a silyl group, an alkyl group, a cycloalkyl group and an arylamino group are substituted or unsubstituted.
- substituents selected from the group consisting of an aryl group, a silyl group, an alkyl group, a cycloalkyl group and an arylamino group are substituted or unsubstituted.
- the metal complex includes, but is not limited to, an iridium complex, a platinum complex, and the like.
- the electron transport layer is a layer that receives electrons from the electron injection layer and transports electrons to the light emitting layer.
- the electron transporting material a material capable of injecting electrons well from the cathode and transferring the electrons to the light emitting layer. Suitable. Specific examples thereof include Al complexes of 8-hydroxyquinoline; Complexes including Alq 3 ; Organic radical compounds; Hydroxyflavone-metal complexes and the like, but are not limited thereto.
- the electron transport layer can be used with any desired cathode material as used in accordance with the prior art.
- suitable cathode materials are conventional materials having a low work function followed by an aluminum or silver layer. Specifically cesium, barium, calcium, ytterbium and samarium, followed by aluminum layers or silver layers in each case.
- the electron injection layer is a layer that injects electrons from an electrode, has an ability to transport electrons, has an electron injection effect from a cathode, an electron injection effect with respect to a light emitting layer or a light emitting material, and hole injection of excitons generated in the light emitting layer
- the compound which prevents the movement to a layer and is excellent in thin film formation ability is preferable.
- fluorenone anthraquinodimethane, diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylenetetracarboxylic acid, preorenylidene methane, anthrone and the like and derivatives thereof, metal Complex compounds, nitrogen-containing five-membered ring derivatives, and the like, but are not limited thereto.
- Examples of the metal complex compound include 8-hydroxyquinolinato lithium, bis (8-hydroxyquinolinato) zinc, bis (8-hydroxyquinolinato) copper, bis (8-hydroxyquinolinato) manganese, Tris (8-hydroxyquinolinato) aluminum, tris (2-methyl-8-hydroxyquinolinato) aluminum, tris (8-hydroxyquinolinato) gallium, bis (10-hydroxybenzo [h] Quinolinato) beryllium, bis (10-hydroxybenzo [h] quinolinato) zinc, bis (2-methyl-8-quinolinato) chlorogallium, bis (2-methyl-8-quinolinato) ( o-cresolato) gallium, bis (2-methyl-8-quinolinato) (1-naphtolato) aluminum, bis (2-methyl-8-quinolinato) (2-naphtolato) gallium, It is not limited to this.
- the hole blocking layer is a layer for preventing the cathode from reaching the hole, and may be generally formed under the same conditions as the hole injection layer. Specifically, there are oxadiazole derivatives, triazole derivatives, phenanthroline derivatives, BCP, aluminum complexes, and the like, but are not limited thereto.
- a first electrode Second electrode; And one or more organic material layers provided between the first electrode and the second electrode.
- An organic electroluminescence further comprising a hole injection or transport layer or a charge generating layer comprising a metal oxide comprising at least one of Group 5, Group 6 and Group 7 transition metals and at least one of Group 1, Group 8, Group 11 and Group 12 metals.
- a hole injection or transport layer or a charge generating layer comprising a metal oxide comprising at least one of Group 5, Group 6 and Group 7 transition metals and at least one of Group 1, Group 8, Group 11 and Group 12 metals.
- Another embodiment of the present specification is a first electrode; Second electrode; And at least one organic material layer provided between the first electrode and the second electrode, wherein the organic light emitting device is between the first electrode and the organic material layer, between the second electrode and the organic material layer, or the organic material layer is two or more layers. If present, it is provided between the organic material layer, and provides an organic electroluminescent device further comprising a hole injection or transport layer or a charge generating layer formed using the coating composition according to the above-described embodiments.
- the hole injection or transport layer or charge generation layer formed using the coating composition is made of a metal oxide.
- the metal oxide includes at least one of Group 5, Group 6 and Group 7 transition metals and at least one of Group 1, Group 8, Group 11 and Group 12 metals.
- the content ratio of Group 5, Group 6, or Group 7 transition metal oxides among all metal atoms in the hole injection or transport layer or the charge generation layer is 50 at% to 99.99 at%.
- the ratio of the Group 1, 8, 11 and 12 metal elements mixed therewith is 0.01 to 50 at% based on 100 at% of Group 5, 6 or 7 transition metals.
- the hole injection or transport layer or the charge generating layer may be represented by M1xM2yOz. At this time, when 0 ⁇ x + y ⁇ 100, 0 ⁇ z ⁇ 400, 50 ⁇ x ⁇ 99.99 and 0.01 ⁇ y ⁇ 50.
- the work function of the hole injection or transport layer or the charge generation layer is 5.0 to 7.0.
- the thickness of the hole injection or transport layer or charge generating layer formed using the coating composition is 1 nm to 1,000 nm. At this time, the hole injection or transport layer or the charge generating layer is increased due to the doping effect occurring in the solution process process, the charge concentration and mobility does not occur voltage reduction due to the thickness.
- the hole injection or transport layer or charge generating layer comprises an M-O bond and M-M bond, wherein M is a metal selected from Group 1, Group 5 to 8, 11 and 12.
- the hole injection or transport layer or the charge generating layer includes MO 3 and M 2 O 5 , wherein M is a metal selected from Group 1, Group 5 to Group 8, Group 11 and Group 12 .
- M is a metal selected from Group 1, Group 5 to Group 8, Group 11 and Group 12 .
- MoO 3 when Mo-Mo bonding occurs by solution process, it has oxidation number of +5 value in addition to +6 value.
- FIG. As a result of analyzing thin film obtained through solution process through XPS, as shown in FIG. It can be confirmed that a +5 valence Mo peak is detected.
- the amount of Mo having a pentavalent oxidation number is not particularly limited as long as it is larger than zero.
- the hole injection or transport layer or the charge generating layer is in contact with the first electrode or the second electrode, and forms an MOX bond with an interface between the first electrode and the second electrode.
- a metal selected from Group 1, Group 5 to Group 8, Group 11 and Group 12 X is one of the elements constituting the electrode in contact with the first electrode and the second electrode.
- the adhesion may be improved and the mechanical strength of the hole injection layer itself may be increased.
- the hole injection or transport layer or the charge generating layer is in contact with the first electrode made of ITO, and forms a Mo-O-In or Mo-O-Sn bond at the interface with the first electrode.
- the hole injection or transport layer or the charge generating layer has a thickness of 1-1,000 nm, and the hole injection or transport layer or the charge generating layer has a thickness of 30 nm or less and a thickness of 30 nm or more.
- driving voltage There is no change in driving voltage.
- the MoO 3 layer was formed by the deposition method as in Example 1 below, the driving voltage was very increased even at a thickness of 40 nm.
- Example 14 and Example 19 were compared.
- the thickness is 30 nm and 50 nm, no increase in voltage was observed.
- the voltage rise within the thickness range may be within 20%, more preferably within 5%.
- the hole injection or transport layer or charge generation layer formed using the coating composition is annealed.
- the hole injection or transport layer or charge generating layer is annealed at a temperature of 150 ⁇ 250 °C, preferably 180 ⁇ 250 °C.
- the organic electroluminescent device may be a top emission type, a bottom emission type, or a double-sided emission type according to a material used.
- a solution of copper acetate and Mo (CO) 6 dissolved in 4% by weight of cyclohexanone at a weight ratio of 0.8: 99.2 was prepared.
- the glass substrate coated with ITO was washed in order with water and isopropanol, and the mixed solution was spin-coated at 1000 rpm for 30 seconds on the substrate on which ITO was deposited.
- the obtained thin film was heat-treated at 200 ° C. for 15 minutes in an oxygen atmosphere to form a hole injection layer having a very uniform thickness of 30 nm.
- a 45 nm thick hole transport layer was formed on the hole injection layer by using 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (NPB).
- An electron blocking layer was formed on the hole transport layer to a thickness of 15 nm.
- a light emitting layer having a thickness of 30 nm was formed by doping a blue dopant BD in a weight ratio of 95: 5 to BH, which is a blue fluorescent host of the following formula, on the electron blocking layer.
- an electron transport layer ET 201 and LIQ were simultaneously deposited at a weight ratio of 1: 1 on the emission layer to form an electron transport layer having a thickness of 20 nm.
- NaNO 3 and MoO 2 (acac) 2 were dissolved in 4 wt% of ethylene glycol monomethyl ether at a weight ratio of 5: 95, coated at 1000 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to prepare a hole injection layer.
- a device was fabricated in the same manner as in Example 1 except for the one described above. At this time, the thickness of the hole injection layer was 30 nm. The properties of this device are shown in Table 1.
- AgNO 3 and MoO 2 (acac) 2 were dissolved in 4wt% of ethylene glycol monomethyl ether at a weight ratio of 0.5: 99.5, coated at 1000 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to prepare a hole injection layer.
- a device was fabricated in the same manner as in Example 1 except for the one described above. At this time, the thickness of the hole injection layer was 30 nm. The properties of this device are shown in Table 1.
- Cs 2 CO 3 and MoO 2 (acac) 2 were dissolved at 4 wt% in ethylene glycol monomethyl ether at a weight ratio of 5:95, coated at 1000 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject a hole injection layer.
- a device was fabricated in the same manner as in Example 1 except that there was prepared. At this time, the thickness of the hole injection layer was 30 nm. The properties of this device are shown in Table 1.
- Zn (acac) 2 and MoO 2 (acac) 2 were dissolved at 4wt% in ethylene glycol monomethyl ether at a weight ratio of 5:95, coated at 700 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject holes.
- a device was fabricated in the same manner as in Example 1 except that the layer was manufactured. At this time, the thickness of the hole injection layer was 30 nm. The properties of this device are shown in Table 1.
- Zn (acac) 2 and MoO 2 (acac) 2 were dissolved at 4wt% in ethylene glycol monomethyl ether at a weight ratio of 5:95, coated at 700 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject holes.
- a device was fabricated in the same manner as in Example 1 except that the layer was manufactured. At this time, the thickness of the hole injection layer was 50 nm. The properties of this device are shown in Table 1.
- a device was manufactured in the same manner as in Example 1, except that the hole injection layer was deposited at 40 nm by depositing MoO 3 .
- a device was manufactured in the same manner as in Example 1, except that MoO 2 (acac) 2 was dissolved in cyclohexanone at a concentration of 4 wt% and coated on ITO-deposited substrate at 1000 rpm, followed by heat treatment in an oxygen atmosphere to prepare a hole injection layer. It was. At this time, the thickness of the hole injection layer was 30 nm.
- Table 1 The properties of this device are shown in Table 1.
- the device formed by the solution process showed low driving voltage characteristics even at a thickness of 30 nm or more. In the case of doping with other elements, it was confirmed that the life characteristics were improved.
- a solution of copper acetate and Mo (CO) 6 dissolved in 4 wt% of cyclohexanone in a weight ratio of 1:99 was prepared.
- the glass substrate coated with ITO was washed in order with water and isopropanol, and the mixed solution was spin-coated at 1000 rpm for 30 seconds on the substrate on which ITO was deposited.
- the obtained thin film was heat-treated at 220 ° C. for 15 minutes in an oxygen atmosphere to form a very uniform hole injection layer having a thickness of 30 nm.
- a hole transport layer was formed by spin coating a solution of the following compound HT-1 dissolved in toluene on the hole injection layer.
- An electron blocking layer was formed on the hole transport layer to a thickness of 15 nm.
- a light emitting layer having a thickness of 30 nm was formed by doping a blue dopant BD in a weight ratio of 95: 5 to BH, which is a blue fluorescent host of the following formula, on the electron blocking layer.
- an electron transport layer ET 201 and LIQ were simultaneously deposited at a weight ratio of 1: 1 on the emission layer to form an electron transport layer having a thickness of 20 nm.
- NaNO 3 and MoO 2 (acac) 2 were dissolved in ethylene glycol monomethyl ether at a weight ratio of 2:98 at a concentration of 4 wt%, coated at 1000 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to prepare a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except for the one described above. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- NaNO 3 and MoO 2 (acac) 2 were dissolved in 4 wt% of ethylene glycol monomethyl ether at a weight ratio of 5:95, coated at 1000 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to prepare a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except for the one described above. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Cs 2 CO 3 and MoO 2 (acac) 2 were dissolved in 4 wt% of ethylene glycol monomethyl ether in a weight ratio of 2:98, coated at 1000 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except that was prepared. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Zn (acac) 2 and MoO 2 (acac) 2 were dissolved in 4wt% of ethylene glycol monomethyl ether at a weight ratio of 10:90, coated at 700 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject holes.
- a device was fabricated in the same manner as in Example 7 except that the layer was manufactured. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Zn (acac) 2 and MoO 2 (acac) 2 were dissolved at 4wt% in ethylene glycol monomethyl ether at a weight ratio of 5:95, coated at 700 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject holes.
- a device was fabricated in the same manner as in Example 7 except that the layer was manufactured. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Ru (acac) 2 and MoO 2 (acac) 2 were dissolved in ethylene glycol monomethyl ether at a weight ratio of 5:95 at a concentration of 4 wt%, coated at 700 rpm on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject holes.
- a device was fabricated in the same manner as in Example 7 except that the layer was manufactured. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- a device was manufactured in the same manner as in Example 7, except that the hole injection layer was deposited at 40 nm by depositing MoO 3 .
- the characteristics of this device are shown in Table 2.
- a device was manufactured in the same manner as in Example 7, except that MoO 2 (acac) 2 was dissolved in cyclohexanone at a concentration of 4 wt% and coated on an ITO-deposited substrate at 1000 rpm, followed by heat treatment in an oxygen atmosphere to prepare a hole injection layer. It was. At this time, the thickness of the hole injection layer was 30 nm.
- Table 2 The characteristics of this device are shown in Table 2.
- Titanium isopropoxide and MoO 2 (acac) 2 were mixed at a weight ratio of 5:95, dissolved in methyl ethyl ketone at a concentration of 4 wt%, coated on a substrate on which ITO was deposited, and then heat-treated in an oxygen atmosphere to prepare a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except for the one described above. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Zr (acac) 2 and MoO 2 (acac) 2 are mixed at a weight ratio of 5:95, dissolved in ethylene glycol monomethyl ether at a concentration of 4wt%, coated on an ITO-deposited substrate, and heat-treated in an oxygen atmosphere to inject a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except that was prepared. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Ga (acac) 2 and MoO 2 (acac) 2 are mixed at a weight ratio of 5:95, dissolved in ethylene glycol monomethyl ether at a concentration of 4wt%, coated on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except that was prepared. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- a device was fabricated in the same manner as in Example 7 except that was prepared. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Al (acac) 3 and MoO 2 (acac) 2 are mixed at a weight ratio of 5:95, dissolved in ethylene glycol monomethyl ether at a concentration of 4wt%, coated on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except that was prepared. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Sn (acac) 2 and MoO 2 (acac) 2 are mixed at a weight ratio of 5:95, dissolved in ethylene glycol monomethyl ether at a concentration of 4 wt%, coated on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except that was prepared. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Cobalt acetyl acetonate and MoO 2 (acac) 2 were mixed in a weight ratio of 5:95, dissolved in ethylene glycol monomethyl ether at a concentration of 4wt%, coated on a substrate on which ITO was deposited, and then heat-treated in an oxygen atmosphere to form a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except for producing. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Si (EtO) 4 (tetraethyl orthosilicate) and MoO 2 (acac) 2 were mixed in a weight ratio of 10:90, dissolved in ethylene glycol monomethyl ether at a concentration of 4wt%, and coated on an ITO-deposited substrate, followed by oxygen
- a device was manufactured in the same manner as in Example 7, except that the hole injection layer was manufactured by heat treatment in an atmosphere. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- Ni (acac) 2 and MoO 2 (acac) 2 were mixed at a weight ratio of 5:95, dissolved in ethylene glycol monomethyl ether at a concentration of 4wt%, coated on an ITO-deposited substrate, and then heat-treated in an oxygen atmosphere to inject a hole injection layer.
- a device was fabricated in the same manner as in Example 7 except that was prepared. At this time, the thickness of the hole injection layer was 30 nm. The characteristics of this device are shown in Table 2.
- the device of Comparative Example 4 formed by forming a hole injection layer by a solution process and heat-treated at 220 ° C. was 30 nm. It can be seen that the above-described thickness shows low driving voltage characteristics, and the devices of Examples 7 to 13 doped with other elements have better life characteristics.
- transition metals such as Mo, W, and V
Abstract
Description
혼합되는 착물 | 전압 | 효율 (EQE) | LT80 | |
실시예 1 | Cu(II)-acetate | 4.48 | 5.26 | 35 |
실시예 2 | NaNO3 | 4.70 | 4.58 | 42 |
실시예 3 | AgNO3 | 3.82 | 4.80 | 30 |
실시예 4 | Cs2CO3 | 4.65 | 4.76 | 45 |
실시예 5 | Zn(II)-acetylacetonate | 4.42 | 4.98 | 40 |
실시예 6 | Zn(II)-acetylacetonate | 4.40 | 4.97 | 35 |
비교예 1 | - | 10 | 1.53 | 2 |
비교예 2 | - | 4.42 | 4.94 | 20 |
혼합되는 착물 | 전압 | 효율 (EQE) | LT80 | |
실시예 7 | Cu(II)-acetate | 4.42 | 5.39 | 45 |
실시예 8 | NaNO3 | 4.44 | 4.86 | 54 |
실시예 9 | NaNO3 | 4.75 | 5.10 | 98 |
실시예 10 | Cs2CO3 | 4.77 | 4.78 | 50 |
실시예 11 | Zn(II)-acetylacetonate | 4.56 | 4.33 | 80 |
실시예 12 | Zn(II)-acetylacetonate | 4.53 | 4.89 | 65 |
실시예 13 | Ru(acac)2 | 4.47 | 4.87 | 48 |
비교예 3 | - | 10 | 1.53 | 2 |
비교예 4 | - | 4.43 | 4.94 | 30 |
비교예 5 | Ti(IV)-isopropoxide | 4.43 | 4.89 | 15 |
비교예 6 | Zr(IV)-acetylacetonate | 4.55 | 5.01 | 10 |
비교예 7 | Ga(III)-acetylacetonate | 4.97 | 5.65 | 30 |
비교예 8 | In(III)-acetylacetonate | 4.45 | 5.25 | 31 |
비교예 9 | Al-acetylacetonate | 4.50 | 4.70 | 23 |
비교예 10 | Sn(II)-acetylacetonate | 4.44 | 4.79 | 32 |
비교예 11 | Co(II)-acetylacetonate | 4.56 | 4.79 | 28 |
비교예 12 | Si(EtO)4 | 7.49 | 5.15 | 8 |
비교예 13 | Ni(acac)2 | 4.78 | 4.94 | 19 |
Claims (20)
- 5족, 6족 및 7족 전이금속 중 하나 이상을 포함하는 유기 금속 착물;1족, 8족, 11족 및 12족 금속 중 하나 이상을 포함하는 유기 금속 착물 또는 금속 염; 및유기 용매를 포함하는 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.
- 청구항 1에 있어서, 상기 5족, 6족 및 7족 전이금속 중 하나 이상을 포함하는 유기 금속 착물은 Mo, W, V 또는 Re를 포함하는 것인 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.
- 청구항 1에 있어서, 상기 1족, 8족, 11족 및 12족 금속 중 하나 이상을 포함하는 유기 금속 착물 또는 금속 염은 Li, Na, K, Rb, 또는 Cs을 포함하는 것인 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.
- 청구항 1에 있어서, 상기 1족, 8족, 11족 및 12족 금속 중 하나 이상을 포함하는 유기 금속 착물 또는 금속 염은 Fe, Ru, Os, Cu, Ag, Au, Zn, 또는 Cd을 포함하는 것인 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.
- 청구항 1에 있어서, 상기 코팅 조성물 중의 전체 금속 원자들 중 5B, 6B 및 7B족 전이금속 중 하나 이상의 원자비는 50 at% 내지 99.9 at%인 것인 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.
- 청구항 1에 있어서, 상기 유기용매는 알코올계 용매 또는 케톤계 용매인 것인 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.
- 청구항 1에 있어서, 상기 유기용매는 하기 일반식 1로 나타내어지는 용매를 포함하는 것인 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.[일반식 1]상기 일반식 1에서 n은 1부터 20까지의 정수이고 l과 m은 각각 혹은 동시에 0부터 5까지의 정수이고 R1, R2, R3 및 R4는 각각 혹은 동시에 수소원자, 탄소수 1 내지 20의 알킬기, 탄소수 2 내지 20의 알케닐기, 탄소수 2 내지 20의 알키닐기 탄소수 1 내지 20의 알콕시기, 탄소수 6 내지 40의 아릴기, 탄소수 2 내지 40의 헤테로 아릴기, 탄소수 1 내지 20의 에스테르기이다.
- 청구항 1에 있어서, 상기 유기용매는 에틸렌 글리콜, 에틸렌글리콜 모노메틸이써, 에틸렌 글리콜 모노에틸이써, 에틸렌 글리콜 모노 프로필 이써, 에틸렌 글리콜 모노 부틸이써, 에틸렌 글리콜 모노펜틸 이써, 에틸렌 글리콜 모노헥실이써, 에틸렌 글리콜 디메틸이써, 에틸렌 글리콜 디에틸이써, 에틸렌 글리콜 디프로필이써, 에틸렌 글리콜 디부틸이써, 에틸렌 글리콜 디펜틸 이써, 에틸렌 글리콜 디헥실이써, 1,2 프로판디올, 1,3-프로판디올, 1,4-부탄디올, 1,2-부탄 디올, 1,3-부탄 디올, 디엘틸렌 글리콜, 디에틸렌 글리콜 모노메틸이써, 디에틸렌 글리콜 모노에틸이써, 디에틸렌 글리콜 모노 프로필 이써, 디에틸렌 글리콜 모노부틸 이써, 디에틸렌 디메틸 이써, 디에틸렌 글리콜 디에틸 이써, 디에틸렌 글리콜 디 프로필 이써, 디에틸렌 글리콜 디 부틸 이써, 에틸렌 글리콜 디아세테이트, PEG 600, 및 트리에틸렌 클리콜 중 적어도 하나를 포함하는 것인 유기 전계 발광 소자의 정공 주입 또는 수송층 또는 전하발생층 코팅 조성물.
- 기판을 준비하는 단계;상기 기판 상에 제1 전극을 형성하는 단계;상기 제1 전극 상에 1층 이상의 유기물층을 형성하는 단계; 및상기 유기물층 상에 제2 전극을 형성하는 단계를 포함하고,상기 제1 전극과 유기물층 사이, 상기 제2 전극과 유기물층 사이, 또는 상기 유기물층이 2층 이상 존재하는 경우 유기물층들 사이에, 청구항 1 내지 8 중 어느 한 항에 따른 코팅 조성물을 이용하여 정공 주입 또는 수송층 또는 전하발생층을 코팅 방법으로 형성하는 단계를 더 포함하는 유기 전계 발광 소자의 제조 방법.
- 청구항 9에 있어서, 상기 코팅 조성물을 이용하여 형성된 정공 주입 또는 수송층 또는 전하발생층의 두께는 1 nm 내지 1,000 nm인 것인 유기 전계 발광 소자의 제조방법.
- 청구항 9에 있어서, 상기 코팅 조성물을 이용하여 형성된 정공 주입 또는 수송층 또는 전하발생층를 형성한 후 어닐링하는 단계를 더 포함하는 유기 전계 발광 소자의 제조방법.
- 청구항 11에 있어서, 상기 어닐링은 온도 150~250 ℃에서 수행하는 것인 유기 전계 발광 소자의 제조방법.
- 제1 전극; 제2 전극; 및 상기 제1 전극과 상기 제2 전극 사이에 구비되는 1층 이상의 유기물층을 포함하는 유기 전계 발광 소자로서,상기 제1 전극과 유기물층 사이, 상기 제2 전극과 유기물층 사이, 또는 상기 유기물층이 2층 이상 존재하는 경우 유기물층들 사이에 구비되고, 5족, 6족 및 7족 전이금속 중 하나 이상과 1족, 8족, 11족 및 12족 금속 중 하나 이상 포함하는 금속 산화물로 이루어진 정공 주입 또는 수송층 또는 전하발생층을 더 포함하는 유기 전계 발광 소자.
- 제1 전극; 제2 전극; 및 상기 제1 전극과 상기 제2 전극 사이에 구비되는 1층 이상의 유기물층을 포함하는 유기 전계 발광 소자로서,상기 제1 전극과 유기물층 사이, 상기 제2 전극과 유기물층 사이, 또는 상기 유기물층이 2층 이상 존재하는 경우 유기물층들 사이에 구비되고, 청구항 1에 따른 코팅 조성물을 이용하여 형성된 정공 주입 또는 수송층 또는 전하발생층을 더 포함하는 유기 전계 발광 소자.
- 청구항 13 또는 14에 있어서, 상기 정공 주입 또는 수송층 또는 전하발생층의 두께는 1 nm 내지 1,000 nm인 것인 유기 전계 발광 소자.
- 청구항 13 또는 14에 있어서, 상기 정공 주입 또는 수송층 또는 전하발생층은 어닐링된 것인 유기 전계 발광 소자.
- 청구항 13 또는 14에 있어서, 상기 정공 주입 또는 수송층 또는 전하발생층의 일함수는 5.0 ~ 7.0인 것인 유기 전계 발광 소자.
- 청구항 13 또는 14에 있어서, 상기 정공 주입 또는 수송층 또는 전하발생층 중 전체 금속 원자들 중 5족, 6족 및 7족 전이금속 중 하나 이상의 원자비는 50 at% 내지 99.9 at%인 것인 유기 전계 발광 소자.
- 청구항 13 또는 14에 있어서, 상기 정공 주입 또는 수송층 또는 전하발생층은 M1xM2yOz로 이루어지고, 여기서 M1은 5족, 6족 또는 7족 전이금속이고, M2는 1족, 8족, 11족 또는 12족 금속이며, 0 < x + y ≤ 100, 0 < z ≤ 400, 50 ≤ x ≤ 99.99, 0.01 ≤ y ≤ 50인 것인 유기 전계 발광 소자.
- 청구항 13 또는 14에 있어서, 상기 정공 주입 또는 수송층 또는 전하발생층은 M-O 결합과 M-M 결합을 포함하거나, MO3 및 M2O5를 포함하거나, 제1 전극과 제2 전극 중 접하는 전극과의 계면과 M-O-X 결합을 형성하고, 여기서 M은 1족, 5족 내지 8족, 11족 및 12족 중에서 선택되는 금속이고, X는 제1 전극과 제2 전극 중 접하는 전극을 구성하는 원소 중 하나인 것인 유기 전계 발광 소자.
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