WO2004096945A1 - 1,3,6,8−四置換ピレン化合物、有機el素子及び有機elディスプレイ - Google Patents
1,3,6,8−四置換ピレン化合物、有機el素子及び有機elディスプレイ Download PDFInfo
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Definitions
- the present invention relates to a 1,3,6,8-tetrasubstituted pyrene compound suitable as a light emitting material in an organic EL device, an organic EL device using the 1,3,6,8-tetrasubstituted pyrene compound, and The present invention relates to an organic EL display using an organic EL element.
- Organic EL devices have characteristics such as self-luminous emission and high-speed response, and are expected to be applied to flat panel displays.
- organic thin films with a hole transporting property hole transporting layer
- organic thin films with an electron transporting property Electrode transport layer
- two-layer type laminate type
- the stacked organic EL device has a basic structure of a positive electrode hole transport layer / a light emitting layer, an electron transport layer, and a negative electrode, wherein the light emitting layer is, as in the case of the two-layer type, the hole transport layer or the light emitting layer.
- the electron transport layer may have the same function.
- a host material which is a main material, is doped with a small amount of a dye molecule having high fluorescent luminescence as a guest material to form a luminescent layer exhibiting high luminous efficiency.
- the organic EL device has excellent luminous efficiency, but high luminous efficiency At present, the organic EL device showing the above is not sufficiently provided.
- the present applicant has previously proposed an organic EL device using 1,3,6,8-tetrafurylvinylene as a light emitting material (see, for example, Patent Document 1).
- the emission luminance when a voltage of 10 V is applied between the negative electrode layer and the positive electrode layer is about 680 cd / m 2 , and further improvement of the light emission efficiency is desired.
- Non-patent document 1 When continuously driven at a constant current of cd / m 2 , the time from initial luminance until luminance is reduced by half (luminance half-life) is 30 hours, and it is desired that the liquid crystal display has a sufficient life for display applications.
- Patent Document 1
- the present invention provides a 1,3,6,8-tetrasubstituted pyrene compound suitable as a blue light-emitting material in an organic EL device, a long-life organic EL device having excellent blue light emission efficiency, light emission luminance, color purity, etc. Further, it is an object of the present invention to provide a high-performance and long-life organic EL display using the organic EL element.
- the organic EL device of the present invention has an organic thin film layer between a positive electrode and a negative electrode, and the organic thin film layer is a 1,3,6,8_tetrasubstituted compound represented by the following structural formula (1). Contains a pyrene compound as a luminescent material. Structural formula (1)
- R 1 to R 4 may be the same or different, and represent a group represented by the following structural formula (2).
- R 5 to R 9 may be the same as or different from each other, and represent a hydrogen atom or a substituent, and at least one is substituted or unsubstituted. Represents a reel group.
- the organic EL device of the present invention contains the specific 1,3,6,8-tetrasubstituted pyrene compound as a light-emitting material, it has excellent blue light emission efficiency, light emission luminance, color purity, etc., and a long drive life. Have.
- the 1,3,6,8_tetrasubstituted pyrene compound of the present invention is represented by the following structural formula (1) ( Structural formula (1)
- R 1 to R 4 may be the same as or different from each other, and represent a group represented by the following structural formula (2).
- R 5 to R 9 may be the same or different from each other, and represent a hydrogen atom or a substituent, and at least one is substituted or unsubstituted. Represents a reel group.
- the 1,3,6,8-tetrasubstituted pyrene compound of the present invention When used as a light-emitting material in an organic EL device, it exhibits blue light emission with excellent luminous efficiency, luminous luminance, color purity, etc., and prolongs the driving life. Can be.
- the organic EL display of the present invention uses the organic EL device of the present invention. Since the organic EL display of the present invention uses the organic EL element of the present invention, it is excellent in blue light emission efficiency, emission luminance, color purity, etc., and shows stable performance even when driven for a long time. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic explanatory view for explaining an example of a layer configuration in the organic EL device of the present invention.
- FIG. 2 is a schematic explanatory view showing an example of the structure of a passive matrix organic EL display (passive matrix panel).
- FIG. 3 is a schematic explanatory diagram showing a circuit in the passive matrix organic EL display (passive matrix panel) shown in FIG.
- FIG. 4 is a schematic explanatory diagram showing an example of the structure of an active matrix organic EL display (active matrix panel).
- FIG. 5 is a schematic explanatory diagram showing a circuit in the active matrix organic EL display (active matrix panel) shown in FIG.
- FIG. 6 is a chart of the IR spectrum of the synthesized 1,3,6,8-tetra (4-biphen-linole) pyrene.
- Figure 7 is a chart of the IR spectrum of the synthesized 1,3,6,8-tetra (4-dibenzofural) pyrene.
- the 1,3,6,8-tetrasubstituted pyrene compound of the present invention is represented by the following structural formula (1).
- R 1 to R 4 may be the same or different, and represent a group represented by the following structural formula (2).
- R 5 to R 9 may be the same as or different from each other, and represent a hydrogen atom or a substituent, and at least one is substituted or unsubstituted.
- the substituent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include an alkyl group and an aryl group, and these may be further substituted with a substituent.
- the substituent is not particularly limited and can be appropriately selected from known ones according to the purpose.
- the alkyl group is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms. , Specifically, methyl, ethyl, propyl, isopropyl, butyl, iso-pentinole, tertiary butyl, pentinole, isopentinole, hexinole, isohexinole, heptyl, isoheptyl, octyl, isooctyl, nonyl, isononyl, decyl, Preferable examples include isodecinole, cyclopentyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, and cyclodecyl.
- the aryl group is not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include a monocyclic aromatic ring group, a group in which four or less aromatic rings are bonded, and five or less rings. And a group having a condensed aromatic ring and having a total of 50 or less atoms of carbon, oxygen, nitrogen and sulfur, and the like.
- the monocyclic aromatic ring group is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include phenyl, tolyl, xylyl, tamenyl, styryl, mesityl, cinnamyl, phenethyl, and benzhydryl. These are substituted with substituents It may be done. Of these, Feuer is preferred.
- the group in which four or less aromatic rings are bonded is not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include naphthyl, anthryl, phenanthryl, indul, azulenyl, and benzanthrase. And these may be substituted with a substituent.
- the group having 5 or less condensed aromatic rings and having a total of 30 or less atoms of carbon, oxygen, nitrogen and sulfur is not particularly limited and may be appropriately selected depending on the purpose.
- R 5 to R 9 in the structural formula (2) may be directly or indirectly connected to each other, and in this case, for example, selected from boron, carbon, nitrogen, oxygen, silicon, phosphorus, and sulfur
- the rings may be connected to each other via at least one atom to form a ring such as an aromatic ring, an aliphatic ring, an aromatic complex ring, or a heterocyclic ring, and the ring may be further substituted with a substituent. Good.
- R 1 to R 4 in the structural formula (1) (the group represented by the structural formula (2))
- the group is a group represented by the following structural formula (2-1)
- The, 8-tetrasubstituted pyrene compound is 1,3,6,8-tetra (4-biphenyl) pyrene or a derivative thereof.
- R 5 to R e and R 8 to R 14 may be the same or different, and represent a hydrogen atom or a substituent.
- the replacement Examples of the group include those described above.
- Specific examples of the 1,3,6,8-tetrasubstituted pyrene compound include 1,3,6,8- Tetra (4-biphenyl) pyrene is preferred.
- R 1 to R 4 in the structural formula (1) are the groups represented by any of the following structural formulas (2-2) to (2-5). Is preferably
- R 2 2 ⁇ R 2 4 represents a hydrogen atom or a substituent.
- substituent the thing mentioned above is mentioned.
- Specific examples of the 1,3,6,8-tetrasubstituted pyrene compound include 1,3,6,8-tetra (4-dibenzofurayl) pyrene represented by the following structural formula (1-2). Also, 1,3,6,8-tetra (4-dibenzothiol) pyrene represented by the following structural formula (1-3) is also preferable.
- the method for producing the 1,3,6,8-tetrasubstituted pyrene compound of the present invention is not particularly limited, and can be appropriately selected from known methods according to the purpose. A method is suitably mentioned.
- 1,3,6,8-tetrapyrene pyrene is synthesized by reacting 1 equivalent of pyrene with 4 equivalents of halogen. Tetrahalogenation is likely to occur at 1, 3, 6, and 8 positions due to the reactivity of pyrene.
- An na 1 ender Chem ie a method similar to the general method for halogenating aromatic hydrocarbons in which a simple substance of halogen is added to pyrene dissolved in a solvent, such as the method described in Vol. 531, page 81.
- the halogen chlorine, bromine, iodine, and the like are advantageous in performing the next step reaction, but among them, chlorine and bromine are particularly preferred in that the halogenation reaction is easy.
- a 1,3,6,8-tetrahalogenated pyrene and an arylboronic acid corresponding to a desired compound are heated in the presence of a catalyst and a base, by a reaction known as so-called “Suzuki coupling”.
- a catalyst a palladium compound such as tetrakis (triphenylphosphine) palladium (0) can be used.
- the base sodium carbonate, potassium carbonate, sodium hydroxide, sodium alkoxide such as sodium t-butoxide, and the like can be used.
- 1,3,6,8-tetra (4-biphenylyl) pyrene is produced by the above general method, first, 1,3,6,8-tetrabromopyrene is prepared by reacting pyrene with bromine. Are synthesized. Then, the 1,3,6,8-tetrabromopyrene is reacted according to the so-called “Suzuki coupling” to synthesize 1,3,6,8-tetra (4-biphen-linole) pyrene. That is, 1,2,1,6,8-tetrabromopyrene is represented by the following structural formula, 4.4 equivalents of 4-biphenyl-2-boronic acid, and 10 equivalents of sodium carbonate in 2 mo 1 solution.
- 1,3,6,8-tetra (4-dibenzofural) pyrene When producing 1,3,6,8-tetra (4-dibenzofural) pyrene, first, 1,3,6,8-tetrabromopyrene is synthesized by reacting pyrene with bromine. The 1,3,6,8-tetrabromopyrene is reacted according to the so-called “Suzuki coupling” to synthesize 1,3,6,8-tetra (4-biphenylenyl) pyrene.
- 1,3,6,8-tetrabromopyrene represented by the following structural formula: 4.4 equivalents of 4-dibenzofuranpolonic acid, 10 equivalents of sodium carbonate in a 2 m o 1/1 aqueous solution, and 0.12 equivalent of tetrakis (triphenylphosphine) palladium (0) is added, and the mixture is heated under reflux with benzene as a solvent for 3 hours to react. After completion of the reaction, the reaction solution is cooled, the reaction solution is washed with water several times, and benzene is distilled off. The remaining oil is washed with methanol and then recrystallized from THF-methanol to obtain a crude reaction product.
- the desired 1,3,6,8-tetra (4-dibenzofural) pyrene can be synthesized by purifying the crude reaction product by vacuum sublimation.
- the 1,3,6,8-tetrasubstituted pyrene compound of the present invention can be suitably used in various fields, but can be particularly preferably used as a luminescent material in an organic EL device.
- the 1,3,6,8-tetrasubstituted pyrene compound of the present invention is used as a light emitting material in an organic EL device, blue light emission is obtained.
- the organic EL device of the present invention has an organic thin film layer between a positive electrode and a negative electrode, and the organic thin film layer is the 1,3,6,8-tetrasubstituted pyrene compound of the present invention, that is, the structure described above.
- a 1,3,6,8-tetrasubstituted pyrene compound represented by the formula (1) is contained as a light emitting material.
- R 1 to R 4 in the structural formula (1) is preferably a substituent represented by the structural formula (2-1). Further, R 1 to R 4 in the structural formula (1) (the group represented by the structural formula (2)) are substituted by any one of the structural formulas (2-2) to (2-5). It is preferably a group.
- the 1,3,6,8-tetrasubstituted pyrene compound may be contained in the light emitting layer of the organic thin film layer as a light emitting material, or may be contained in the light emitting layer of the organic thin film layer. It may be contained in an electron transport layer, a light emitting layer and a hole transport layer, and the like.
- the light emitting layer is formed by forming a film of the 1,3,6,8-tetrasubstituted pyrene compound alone.
- other materials may be formed in addition to the 1,3,6,8-tetrasubstituted pyrene compound.
- the light-emitting layer, the light-emitting layer / electron transport layer, the light-emitting layer / hole transport layer, and the like in the organic thin film layer may be used as the guest material as the 1, 3, 6, 8-tetrasubstituted pyrene compound of the present invention. It is preferable that, in addition to the guest material, a host material having an emission wavelength near the light absorption wavelength of the guest material is further included.
- the host material is preferably contained in the light emitting layer, but may be contained in a hole transport layer, an electron transport layer, or the like.
- the host material When the guest material and the host material are used in combination, when the organic EL emission occurs, the host material is first excited. Then, since the emission wavelength of the host material and the absorption wavelength (330 to 500 nm) of the guest material (1, 3, 6, 8_tetrasubstituted pyrene compound) overlap with each other, The excitation energy efficiently moves to the guest material, the host material returns to the ground state without emitting light, and only the guest material in the excited state emits the excitation energy as blue light. Excellent luminous efficiency, luminous brightness, color purity, etc.
- the light-emitting molecules when light-emitting molecules are present alone or in a high concentration in a thin film, the light-emitting molecules approach each other to cause an interaction between the light-emitting molecules, resulting in a phenomenon called “concentration quenching” that lowers the light emission efficiency.
- concentration quenching when the guest material and the host material are used in combination, the 1,3,6,8-tetrasubstituted pyrene compound, which is the guest compound, is dispersed at a relatively low concentration in the host compound. This is advantageous in that the “concentration quenching” is effectively suppressed, and the luminous efficiency is excellent.
- the guest material and the host material are When used in combination in a light emitting layer, the host material is generally excellent in film formability, and is therefore advantageous in that the light emitting property is maintained and the film formability is excellent.
- the host material is not particularly limited and can be appropriately selected depending on the intended purpose. However, a material having an emission wavelength near the light absorption wavelength of the guest material is preferable.
- R n In the structural formula (7), n represents an integer of 2 or 3.
- Ar represents a divalent or trivalent aromatic group or a heterocyclic aromatic group.
- R 25 and R 26 may be the same or different, and represent a monovalent aromatic group or a heterocyclic aromatic group.
- the monovalent aromatic group or heterocyclic aromatic group is not particularly limited and may be appropriately selected depending on the purpose.
- a r is shown below represents a divalent or trivalent group, or a divalent or trivalent group containing a heterocyclic aromatic ring containing an aromatic ring.
- R represents a linking group, and the following are preferably exemplified.
- R 2 7 and R 2 8 are each independently a hydrogen atom, a halogen atom, an alkyl group, Ararukiru group, Aruke - group, Ariru group, Shiano group, an amino group, Ashiru group , An alkoxycarbonyl group, a propyloxyl group, an alkoxy group, an alkylsulfonyl group, a hydroxyl group, an amide group, an aryloxy group, an aromatic hydrocarbon ring group, or an aromatic heterocyclic group, which are further substituted with a substituent. You may.
- n represents an integer, and 2 or 3 is preferable.
- ⁇ i benzene rings are two linked aromatic group via a single bond
- R 2 7 and R 2 8 are hydrogen atoms
- CBP 4,4,1-bis (9-carbazolyl) -biphenyl
- M represents a trivalent metal element.
- R 29 represents a hydrogen atom or an alkyl group.
- R 3 ° represents a hydrogen atom or an aryl group.
- P represents an integer of 1 or 2.
- an aluminum hydroxyquinoline-loxybiphenyl complex (BA1q) represented by the following structural formula (12) is preferable.
- R 3 1 ⁇ R 3 4 may be different may be identical or different, represent a hydrogen atom or a substituent.
- Preferred examples of the substituent include an alkyl group, a cycloalkyl group and an aryl group, and these may be further substituted with a substituent.
- 9,9 Biantril Content of the 1,3,6,8-tetrasubstituted pyrene compound in the layer containing the 1,3,6,8-tetrasubstituted pyrene compound represented by the structural formula (1) Is preferably from 0.1 to 50% by mass, more preferably from 0.5 to 20% by mass. JP2003 / 005577 If the content is less than 0.1% by mass, luminous efficiency, luminous brightness, color purity, etc. may not be sufficient, and if it exceeds 50% by mass, the color purity may decrease. On the other hand, a range that is more preferable than the above range is preferable in terms of excellent luminous efficiency, luminous luminance, color purity, and the like.
- the light emitting layer in the organic EL device of the present invention can inject holes from the positive electrode, the hole injection layer, the hole transport layer, and the like when an electric field is applied, and the negative electrode, the electron injection layer, and the electron transport layer Or the like, and further provides a field of recombination between the holes and the electrons, and the recombination energy generated at the time of the recombination causes blue light emission to be performed.
- the blue light emission is not affected except for the 1,3,6,8-tetrasubstituted pyrene compound.
- Other light-emitting materials may be contained in the enclosure.
- the light-emitting layer can be formed according to a known method.
- Examples of the light-emitting layer include a vapor deposition method, a wet film formation method, an MBE (molecular beam epitaxy) method, a cluster ion beam method, a molecular lamination method, an LB method, and a printing method. It can be preferably formed by a transfer method or the like.
- the vapor deposition method is preferable in that it can be easily and efficiently manufactured at low cost without using a waste liquid without using an organic solvent, but the vapor deposition method is preferable.
- the light emitting layer is formed as a hole transporting layer, a light emitting layer, and an electron transporting layer, a wet film forming method is also preferable.
- the evaporation method is not particularly limited and can be appropriately selected from known methods depending on the purpose.
- examples include a vacuum evaporation method, a resistance heating evaporation method, a chemical evaporation method, a physical evaporation method, and the like.
- examples of the chemical vapor deposition method include a plasma CVD method, a laser CVD method, a thermal CVD method, and a gas source CVD method.
- the light-emitting layer is formed by the vapor deposition method, for example, by vacuum-depositing the 1,3,6,8-tetrasubstituted pyrene compound so that the light-emitting layer is formed by the 1,3,6,8-tetrasubstituted pyrene compound.
- the 1,3,6,8-tetrasubstituted pyrene compound and the host material can be suitably deposited by co-evaporation by vacuum evaporation.
- the former case is easy to manufacture because no co-evaporation is required.
- the wet film forming method is not particularly limited and may be appropriately selected from known methods according to the purpose. Examples thereof include an ink jet method, a spin coating method, and a lower coater. Coating method, bar coating method, blade coating method, casting method, dipping method, curtain coating method and the like.
- a solution in which the material of the light emitting layer is dissolved or dispersed together with a resin component can be used (applied or the like).
- a resin component for example, polyvinyl carbazole, polycarbonate, poly Butyl chloride, polystyrene, polymethyl methacrylate, polyesternole, polysnoreon, polyphenylene oxide, polybutadiene, hydrocarbon resin, ketone resin, phenoxy resin, polyamide, ethyl cellulose, cellulose acetate butyl, ABS resin, polyurethane, melamine resin, non Saturated polyester resins, alkyd resins, epoxy resins, silicone resins, and the like.
- the formation of the light emitting layer by the wet film forming method is, for example, using a solution (coating solution) of the 1,3,6,8-tetrasubstituted pyrene compound and the resin material used as necessary in a solvent (coating solution). And drying), when the host material is contained in addition to the 1,3,6,8-tetrasubstituted pyrene compound, the 1,3,6,8-tetrasubstituted pyrene compound; It can be suitably carried out by using (coating and drying) a solution (coating solution) in a solvent in which the host material and the resin material used as required are dissolved in a solvent.
- the thickness of the light emitting layer is preferably from 1 to 50 nm, more preferably from 3 to 20 nm.
- the organic EL device of the present invention has an organic thin film layer including a light emitting layer between a positive electrode and a negative electrode, and may have another layer such as a protective layer depending on the purpose.
- the organic thin film layer has at least the light emitting layer, and further has a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer, an electron injection layer, and the like, if necessary.
- a hole injection layer a hole transport layer, a hole blocking layer, an electron transport layer, an electron injection layer, and the like, if necessary.
- the positive electrode is not particularly limited and can be appropriately selected depending on the purpose.
- the organic thin film layer specifically, when the organic thin film layer has only the light emitting layer, the light emitting layer is provided.
- the hole transporting layer is provided.
- the organic thin film layer further has the hole injection layer a layer capable of supplying holes (carrier) to the hole injection layer is preferable.
- the material of the positive electrode is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include metals, alloys, metal oxides, electrically conductive compounds, and mixtures thereof. Among them, a material having a work function of 4 eV or more is preferable from the viewpoint of easy injection of holes into the organic thin film layer.
- the material of the positive electrode include conductive metal oxides such as tin oxide, zinc oxide, indium oxide, and indium tin oxide (ITO); metals such as gold, silver, chromium, and nickel; Mixtures or laminates with metal oxides; inorganic conductive substances such as copper iodide and copper sulfide; organic conductive materials such as polyaniline, polythiophene and polypyrrole; and laminates of these with ITO, etc. Can be These may be used alone or in combination of two or more. Among these, conductive metal oxides are preferable, and ITO is particularly preferable from the viewpoints of productivity, high conductivity, transparency, and the like.
- the thickness of the positive electrode is not particularly limited and may be appropriately selected depending on the material and the like. From the viewpoint of the balance between electric resistance and light absorption, 1 to 500 nm is preferable, and 20 to 20 nm. 0 nm is more preferred.
- the positive electrode is usually formed on a substrate made of glass such as soda lime glass or non-alkali glass, or a transparent resin.
- the alkali-free glass or the soda-lime glass coated with a barrier coat such as silica is preferable from the viewpoint of reducing the ions eluted from the glass.
- the thickness of the substrate is not particularly limited as long as the thickness is sufficient to maintain the mechanical strength.However, when glass is used as the substrate, the thickness is usually 0.2 mm or more. 7 mm or more is preferable.
- the positive electrode may be formed, for example, by a vapor deposition method, a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, a MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, a plasma polymerization method (high frequency Excited ion plating method), It can be suitably formed by the above-described methods such as a method of applying the ITO dispersion by a molecular lamination method, an LB method, a printing method, a transfer method, and a chemical reaction method (eg, a sol-gel method).
- the positive electrode can be subjected to washing or other treatment to lower the driving voltage of the organic EL element or increase the luminous efficiency.
- the other treatment for example, when the material of the positive electrode is IT I, a UV-ozone treatment, a plasma treatment and the like are preferably exemplified.
- the negative electrode is not particularly limited and may be appropriately selected depending on the intended purpose.
- the organic thin film layer specifically, when the organic thin film layer has only the light emitting layer, the light emitting layer
- the organic thin film layer further has the electron transport layer
- electrons are supplied to the electron transport layer
- the organic thin film layer has an electron injection layer between the organic thin film layer and the negative electrode, electrons are supplied to the electron injection layer.
- the material of the negative electrode is not particularly limited, and may be appropriately selected according to the adhesion between the layer or molecules adjacent to the negative electrode such as the electron transport layer and the light emitting layer, ionization potential, stability, and the like. Examples thereof include metals, alloys, metal oxides, electrically conductive compounds, and mixtures thereof.
- the negative electrode material include alkali metals (eg, Li, Na, K, Cs, etc.), alkaline earth metals (eg, Mg, Ca, etc.), gold, silver, lead, aluminum, Sodium-potassium alloy or mixed metal thereof, lithium-aluminum alloy or mixed metal thereof, magnesium-silver alloy or mixed metal thereof, rare earth metal such as indium, iturbium, and alloys thereof .
- alkali metals eg, Li, Na, K, Cs, etc.
- alkaline earth metals eg, Mg, Ca, etc.
- gold silver, lead, aluminum
- Sodium-potassium alloy or mixed metal thereof lithium-aluminum alloy or mixed metal thereof
- magnesium-silver alloy or mixed metal thereof magnesium-silver alloy or mixed metal thereof
- rare earth metal such as indium, iturbium, and alloys thereof .
- a material having a work function of 4 eV or less is preferable, and aluminum, a lithium-aluminum alloy or a mixed metal thereof, a magnesium-silver alloy or a mixed metal thereof, and the like are more preferable.
- the thickness of the negative electrode is not particularly limited and can be appropriately selected depending on the material and the like of the negative electrode. From the viewpoint of electric resistance, the thickness is preferably 1 to 100 nm, and 20 to 2 nm. 00 nm is more preferred.
- the negative electrode may be formed, for example, by a vapor deposition method, a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, a MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, a plasma polymerization method (high frequency Excitation ion plating method), molecular lamination method, LB method, printing method, transfer method, etc., can be suitably formed by the above-mentioned methods.
- the two or more materials When two or more materials are used in combination as the material of the negative electrode, the two or more materials may be simultaneously evaporated to form an alloy electrode or the like, or an alloy electrode or the like may be formed by depositing a previously prepared alloy. It may be formed.
- the resistance values of the positive electrode and the negative electrode are preferably low, and are preferably several hundreds ⁇ / port or less.
- the hole injection layer is not particularly limited and may be appropriately selected depending on the intended purpose.
- the hole injection layer has a function of injecting holes from the positive electrode when an electric field is applied. Is preferred.
- the material for the hole injection layer is not particularly limited and may be appropriately selected depending on the intended purpose.
- a star perstamine represented by the following structural formula (4, 4,, 4 "-tris [3-methylphenyl (phenyl) amino] triphenylamine: m—MT DATA), copper phthalocyanine, polyaniline, and the like are preferable.
- the thickness of the hole injection layer is not particularly limited and can be appropriately selected depending on the intended purpose.
- the thickness is preferably about 1 to 100 nm, and more preferably 5 to 50 nm.
- the hole injection layer may be formed, for example, by a vapor deposition method, a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, a MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, or a plasma deposition method.
- the hole transport layer is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a layer having a function of transporting holes from the positive electrode when an electric field is applied is preferable.
- the material of the hole transport layer is not particularly limited and can be appropriately selected depending on the intended purpose.
- examples include an aromatic amine compound, carbazole, imidazole, triazole, oxazole, oxaxazole, polyarylalkane, and pyrazoline.
- a hole transport layer / light emitting layer can be formed by forming a film by mixing the material of the hole transport layer with the material of the light emitting layer.
- aromatic amine compounds are preferable, and specifically, TPD ( N, N, one diphenyl N, N, one bis (3-methylphenyl) -one [1,1, one-biphenyl] one, four, four, jamine, NPD (N, N, dinaphthinole N, N, diphenyl-1 [1,1,1-biphenyl] —4,4′diamine) and the like are more preferred.
- the thickness of the hole transport layer is not particularly limited and can be appropriately selected depending on the intended purpose.
- the thickness is usually 1 to 500 nm, and from the viewpoint of luminous efficiency, 10 to 100 nm Is preferred.
- the hole transport layer may be formed, for example, by a vapor deposition method, a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, a MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, or a plasma weight method. It can be suitably formed by the above-mentioned methods such as a synthesizing method (high-frequency excitation ion plating method), a molecular lamination method, an LB method, a printing method, and a transfer method.
- a synthesizing method high-frequency excitation ion plating method
- a molecular lamination method such as an LB method, a printing method, and a transfer method.
- the hole blocking layer is not particularly limited and may be appropriately selected depending on the intended purpose.
- a layer having a function of blocking holes injected from the positive electrode is preferable.
- the material of the hole blocking layer is not particularly limited, and can be appropriately selected depending on the purpose.
- the organic EL device When the organic EL device has the hole blocking layer, holes transported from the positive electrode side are blocked by the hole blocking layer, and electrons transported from the negative electrode are blocked by the hole blocking layer. When the light reaches the light-emitting layer through the layer, recombination of electrons and holes occurs efficiently in the light-emitting layer. Recombination can be prevented, and luminescence from the target 1,3,6,8 tetrasubstituted pyrene compound, which is the desired luminescent material, can be efficiently obtained, which is advantageous in terms of color purity and the like.
- the hole blocking layer is preferably disposed between the light emitting layer and the electron transport layer.
- the thickness of the hole blocking layer is not particularly limited and may be appropriately selected depending on the intended purpose.
- the thickness is usually about 1 to 500 nm, and preferably 10 to 5 nm.
- the hole blocking layer may have a single-layer structure or a laminated structure.
- the hole blocking layer may be formed, for example, by a vapor deposition method, a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, an MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, Plasma polymerization (high-frequency excitation ion plating), molecular lamination, LB, printing, transfer, etc. It can be more suitably formed.
- One electron transport layer is one electron transport layer.
- the electron transport layer is not particularly limited and may be appropriately selected depending on the intended purpose.
- Examples of the electron transport layer include a function of transporting electrons from the negative electrode and a function of blocking holes injected from the positive electrode. Those having any of them are preferable.
- the material of the electron transport layer is not particularly limited and may be appropriately selected depending on the intended purpose.
- examples thereof include a quinoline derivative such as the aluminum quinoline complex (A1q), an oxadiazole derivative, a triazole derivative, and a phenolic port.
- examples include a phosphorus derivative, a perylene derivative, a pyridine derivative, a pyrimidine derivative, a quinoxaline derivative, a diphenylquinone derivative, and a nitro-substituted fluorene derivative.
- A1q aluminum quinoline complex
- the thickness of the electron transport layer is not particularly limited and may be appropriately selected depending on the purpose.
- the thickness is usually about 1 to 500 nm, and preferably 10 to 50 nm.
- the electron transport layer may have a single-layer structure or a multilayer structure.
- an electron transporting material having a shorter light absorption edge than the above-mentioned 1, 3, 6, 8-tetrasubstituted pyrene compound is used as the electron transporting material used for the electron transporting layer adjacent to the light emitting layer. This is preferable from the viewpoint of limiting the light emitting region in the organic EL element to the light emitting layer and preventing unnecessary light emission from the electron transport layer.
- Examples of the electron transporting material having a shorter light absorption edge than the 1,3,6,8_tetrasubstituted pyrene conjugate include a phenanthroline derivative, an oxadiazole derivative, and a triazole derivative.
- BCP 2,9-Dimethyl-1,4,7-diphenyl-1,10-phenanthroline
- BCP 2,9-Dimethyl-1,4,7-diphenyl-1,10-phenanthroline
- 2- (4-tert-butylphenyl) _5_ (4-biphenylyl)- 1,3,4 1-oxaziazole
- Etc. and the like suitably t
- the electron transport layer may be formed, for example, by a vapor deposition method, a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, an MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, or a plasma polymerization method. (High-frequency excitation ion plating method), molecular lamination method, LB method, printing method, transfer method, etc., can be suitably formed by the above-mentioned methods.
- One electron injection layer can be suitably formed by the above-mentioned methods.
- the electron injection layer is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a layer having a function of injecting electrons from the negative electrode and sending the electrons to the electron transport layer. preferable.
- the material of the electron injection layer is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include alkali metal fluorides such as lithium fluoride, alkaline earth metal fluorides such as strontium fluoride, and the like. Is mentioned.
- the thickness of the electron injection layer is not particularly limited and can be appropriately selected depending on the intended purpose.
- the thickness is usually about 0.1 to 10 nm, and the electron injection layer can be easily injected into the organic thin film layer. In this respect, 0.5 to 2 nm is preferable.
- the electron injection layer may be formed, for example, by a vapor deposition method, a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, an MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, or a plasma polymerization method. (High frequency excitation ion plating method), molecular lamination method, LB method, printing method, transfer method, etc. Can be formed.
- a vapor deposition method a wet film formation method, an electron beam method, a sputtering method, a reactive sputtering method, an MBE (molecular beam epitaxy) method, a cluster ion beam method, an ion plating method, or a plasma polymerization method. (High frequency excitation ion plating method), molecular lamination method, LB method, printing method, transfer method, etc. Can be formed.
- the organic EL device of the present invention may have other layers appropriately selected according to the purpose.
- the other layers include a protective layer and the like.
- the protective layer is not particularly limited and may be appropriately selected depending on the purpose. For example, it is possible to prevent molecules or substances such as moisture and oxygen that accelerate the deterioration of the organic EL element from entering the organic EL element. Those that are possible are preferred.
- the material of the protective layer for example, I n, Sn, Pb, Au, Cu, Ag, Al, T i, metals such as N i, MgO, S i O , S i 0 2, A1 2 0 3, GeO, N i O, C aO , B aO, F e 2 0 3, Y 2 0 3, T i 0 metal oxides such as 2, S i N, nitrides such S i Nx Oy, MgF 2, L i F, Al F 3, Ca F 2 metal fluorides such as, polyethylene having, polypropylene, polymethyl methacrylate Tari rate, polyimide, polyurea, Po Ritetorafureo port ethylene, polyclonal port Torifunoreo port ethylene, poly-dichloro-diphenyl Honoré Oroechiren, black
- metals such as N i, MgO, S i O , S i 0 2, A1 2 0 3, GeO
- the protective layer may be formed, for example, by a vapor deposition method, a wet film formation method, a sputtering method, a reactive sputtering method, an MBE (molecular beam epitaxy) method, a cluster-on-beam method, an ion plating method, a plasma polymerization method (high-frequency excitation ion Plating method), printing method, transfer method, etc., can be suitably formed by the above-mentioned methods.
- the structure of the organic EL device of the present invention is not particularly limited and may be appropriately selected depending on the purpose.
- Examples of the layer structure include the following layer structures (1) to (13), (1) Positive electrode / Hole injection layer Z Hole transport layer / Emitting layer / Electron transport layer Electron injection layer Negative electrode, (2) Positive electrode / Hole injection layer / Hole transport layer / Emitting layer / Electron transport layer Z negative electrode, (3) positive electrode Z hole transport layer Z light emitting layer Z electron transport layer / electron injection layer Z negative electrode, (4) positive electrode / hole transport layer Emission layer Z electron transport layer / negative electrode, (5) Positive electrode / hole injection layer Z hole transport layer // Emission layer / electron transport layer Z electron injection layer Z negative electrode, (6) positive electrode Z hole injection layer / positive Hole transport layer Z light emitting layer and electron transport layer Z negative electrode, (7) positive electrode / hole transport layer light emitting layer and electron transport layer electron injection layer Z negative electrode, (8) positive electrode / hole transport layer / light emitting layer and electron transport layer Z negative electrode, (9) positive electrode Z hole injection layer / hole transport layer and light emitting layer / electron transport layer
- the organic EL device has the hole blocking layer
- a layer in which the hole blocking layer is disposed between the light emitting layer and the electron transport layer is preferably exemplified.
- FIG. 1 illustrates the (4) embodiment of the positive electrode Z, the hole transporting layer Z, the light emitting layer / the electron transporting layer, and the negative electrode.
- the organic EL element 10 is formed on a glass substrate 12.
- the formed positive electrode 14 for example, an ITO electrode
- a hole transport layer 16 a light-emitting layer 18, an electron transport layer 20, and a negative electrode 22 (for example, an A1-Li electrode) are laminated in this order.
- the positive electrode 14 for example, an ITO electrode
- the negative electrode 22 for example, an A1-Li electrode
- An organic thin film layer 24 for emitting blue light is formed by the hole transport layer 16, the light emitting layer 18, and the electron transport layer 20.
- the emission peak wavelength of the organic EL device of the present invention is preferably from 400 to 480 nm.
- As the luminous efficiency of the organic EL device of the present invention from a practical viewpoint, it is desirable to emit blue light at a voltage of 10 V or less, preferably emit blue light at 7 V or less, and emit blue light at 5 V or less. Is more preferred.
- the applied voltage 10 V preferably at l OO c dZni 2 or more, more preferably 500 c dZni 2 or more, 1000 It is particularly preferred that it is cd / m 2 or more.
- the organic EL device of the present invention includes, for example, a computer, an in-vehicle display, an outdoor display, a home appliance, a commercial appliance, a home appliance, a traffic display, a clock display, a calendar display, and a luminescent device. Although it can be suitably used in various fields including screens, audio equipment, etc., it can be particularly preferably used in the following organic EL display of the present invention. Can be.
- the organic EL display of the present invention is not particularly limited except that the organic EL device of the present invention is used, and a known configuration can be appropriately adopted.
- the organic EL display may be a single-color blue light-emitting device, a multi-color light-emitting device, or a funeral color type.
- the organic EL display As a method for making the organic EL display a full-color type, for example, as described in “Monthly Display”, September 2000, pages 33 to 37, three primary colors (blue (B), green (G), red (R))
- the organic EL element that emits light corresponding to each of the three colors is arranged on the substrate.
- a color conversion method of converting blue light emitted by an organic EL element for blue light emission into red (R) and green (G) through a fluorescent dye layer Since the organic EL device of the present invention used for blue light emission, a three-color light-emitting method, a color conversion method, and the like can be suitably used, and a three-color light-emitting method can be particularly preferably used.
- an organic EL element for red light emission and an organic EL element for green light emission Is required.
- the organic EL device for emitting red light is not particularly limited and may be appropriately selected from known devices.
- the layer configuration is represented by the following formula: ITO (positive electrode) / NPDZ DC J TB 1% aluminum quinoline complex (A 1 q) / the above A 1 q / A 1 -Li (negative electrode).
- the DC J TB is 4-di cyanomethylene-6-cp-julolidinostyryl-2--2-tert-butyl-4H-pyran. Note that ⁇ c A 1 q is as described above.
- the organic EL device for emitting green light is not particularly limited and can be appropriately selected from known devices.
- the layer configuration is ITO (positive electrode) / the NPD / the DPVB iZ. 1 qZA 1—Li (negative electrode), and the like are preferred.
- the mode of the organic EL display is not particularly limited and can be appropriately selected depending on the purpose. For example, “Nikkei Electronics”, No. 765, March 13, 2000, 55 to 62 Preferable examples include a passive matrix panel and an active matrix panel as described on the page.
- the passive matrix panel has strip-shaped positive electrodes 14 (for example, ITO electrodes) arranged in parallel on a glass substrate 12, And a strip-shaped organic thin film layer 24 for blue light emission, an organic thin film layer 26 for green light emission, and an organic thin film layer 28 for red light emission arranged in a direction substantially orthogonal to the positive electrode 14.
- a negative electrode 22 having the same shape as these is provided.
- Each of the organic thin-film layers 24, 26, and 28 for blue light emission, green light emission, and red light emission located at each intersection functions as a pixel, and a plurality of organic EL elements 34 exist for each pixel.
- the passive matrix panel when current is applied to one of the positive electrodes 14 on the positive electrode line 30 and one of the negative electrodes 22 on the negative electrode line 32 by the constant current source 36, A current is applied to the organic EL thin film layer located at the position, and the organic EL thin film layer at the position emits light. By controlling the light emission of each pixel, a full-color image can be easily formed.
- the active matrix panel has, for example, as shown in FIG. 4, scanning lines, data lines, and current supply lines formed on a glass substrate 12 in a grid pattern, and the scanning lines forming a grid pattern.
- a positive electrode 14 for example, an ITO electrode
- a strip-shaped organic thin-film layer 24 for blue light emission, an organic thin-film layer 26 for green light emission, and an organic thin-film layer 28 for red light emission are arranged in parallel with each other in order.
- the negative electrode 22 is arranged so as to cover them all.
- the organic thin film layer for blue light emission 24, the organic thin film layer for green light emission 26, and the organic thin film layer for red light emission 28 are respectively a hole transport layer 16, a light emitting layer 18, and an electron transport layer 2.
- a plurality of scanning lines 46 provided in parallel, and a plurality of data lines 42 and current supply lines 44 provided in parallel are orthogonal to each other.
- a switching TFT 48 and a driving TFT 50 are connected to form a circuit.
- the switching TFT 48 and the driving TFT 50 can be driven for each grid.
- each of the organic thin-film elements 24, 26, and 28 for blue light emission, green light emission, and red light emission functions as pixels, and the scanning is arranged in the horizontal direction in the active matrix panel.
- the switching TFT 48 located at the intersection is driven. Accordingly, the driving TFT 50 is driven, and the organic EL element 52 at the position emits light. By controlling the light emission of each pixel, a full-color image can be easily formed.
- the organic EL display of the present invention is excellent in blue light emission efficiency, light emission luminance, color purity, and the like, and has stable performance for long-time driving.
- examples of the present invention will be described, but the present invention is not limited to these examples.
- 1,3,6,8-tetrabromopyrene was synthesized by reacting 1 equivalent of pyrene with 4 equivalents of bromine in nitrobenzene.
- 1,3,6,8-tetrabromopyrene was reacted according to the so-called “Suzuki coupling” to synthesize 1,3,6,8-tetra (4-biphenylenyl) pyrene. That is, with respect to 1,3,6,8-tetrabromopyrene, 4.4 equivalents of 4-biphenylboronic acid represented by the following structural formula, 10 equivalents of sodium carbonate aqueous solution of 2 mO 1/1, 0.12 equivalents of tetrakis (triphenylphosphine) palladium (0) was added, and the mixture was heated and refluxed with benzene as a solvent for 3 hours to be reacted.
- 4-biphenylboronic acid represented by the following structural formula, 10 equivalents of sodium carbonate aqueous solution of 2 mO 1/1, 0.12 equivalents of tetrakis (triphenylphosphine) palladium (0) was added, and the mixture was heated and refluxed
- reaction solution was cooled, and the reaction solution was washed with water several times, and then benzene was distilled off. The remaining oil was washed with methanol and then recrystallized from THF-methanol to obtain a crude reaction product.
- the crude reaction product was purified by vacuum sublimation to obtain 1,3,6,8-tetra (4-biphenylyl) pyrene.
- the synthesized 1,3,6,8-tetra (4-biphenylyl) pyrene is a compound represented by the following structural formula.
- Figure 6 shows the IR spectrum of the synthesized 1,3,6,8-tetra (4-biphenylyl) pyrene by the KBr tablet method.
- Example 1 1,3,6,8-tetra (4-) was prepared in the same manner as in Example 1 except that 4-biphenylpyrboronic acid was replaced by 4-dibenzofuranboronic acid represented by the following structural formula. Dibenzofuranyl) pyrene was synthesized.
- the synthesized 1,3,6,8-tetra (4-di: nzofuranyl) pyrene is a compound represented by the following structural formula.
- Figure 7 shows the IR spectrum of the synthesized 1,3,6,8-tetra (4-dibenzofuranyl) pyrene by the KBr tablet method. (Example 3)
- N a hole transport layer on the I tO electrodes
- N Jinafuchiru N
- N Jifueniru one [1, 1, Bifue - -]
- 4,4, Jiamin NPD
- N 1,3 6,6,8-Tetra (4-biphenylyl) pyrene was coated and evaporated to a thickness of 20 nm.
- BA1q aluminum hydrido xyquinoline-oxybiphenyl complex
- Example 3 the light-emitting layer was formed by combining 1,3,6,8-tetra (4-biphenyl) pyrene with N, N, 1-dinaphthyl-N, N, diphenyl [1,1′-biphenyl] Except that 4,4, diamine (NPD) was co-deposited with 1,3,6,8-tetra (4-biphenyl-pyrylene) pyrene 10 so that the NPD 90 would be obtained. In the same manner as in Example 3, an organic EL device was produced.
- Example 4 N, N, 1-dinaphthyl-N, N, 1-diphenyl- [1,1, -biphenyl] -4,4, -diamine (NPD) was used as a material for the light-emitting layer.
- NPD N, N, 1-dinaphthyl-N, N, 1-diphenyl- [1,1, -biphenyl] -4,4, -diamine
- An organic EL device was produced in the same manner as in Example 4, except that the oxybiphenyl complex (BA1q) was used.
- Example 4 N, N'-dinaphthyl-N, N, difluoro [1,1, -biphenyl] -4,4'diamine (NPD) as a material for the light emitting layer was replaced with 4,4, -bisamine.
- An organic EL device was produced in the same manner as in Example 4, except that (9-carbazolyl) -biphenyl (CBP) was used.
- Example 6 1,3,6,8-tetra (4-biphenylyl) pyrene synthesized in Example 1 as a light emitting material was replaced with 1,3,6,8-tetra (4-biphenylidyl) pyrene synthesized in Example 2.
- An organic EL device was produced in the same manner as in Example 6, except that 4-dibenzofuranyl) pyrene was used.
- An organic EL device was prepared in the same manner as in Example 6, except that 1,3,6,8-tetra (4-biphenylyl) pyrene was replaced by 1,3,6,8-tetraphenylvinylene. Was prepared.
- a 1,3,6,8-tetrasubstituted pyrene compound suitable as a blue light-emitting material in an organic EL device which solves the above-mentioned problems in the prior art, has excellent blue light-emitting efficiency, light-emitting luminance, color purity, etc.
- a long-life organic EL element, and a high-performance, long-life organic EL display using the organic EL element can be provided.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004571322A JPWO2004096945A1 (ja) | 2003-05-01 | 2003-05-01 | 1,3,6,8−四置換ピレン化合物、有機el素子及び有機elディスプレイ |
PCT/JP2003/005577 WO2004096945A1 (ja) | 2003-05-01 | 2003-05-01 | 1,3,6,8−四置換ピレン化合物、有機el素子及び有機elディスプレイ |
EP03721011.9A EP1621597B1 (en) | 2003-05-01 | 2003-05-01 | 1,3,6,8-tetrasubstituted pyrene compounds, organic el device and organic el display |
US11/166,692 US20050238920A1 (en) | 2003-05-01 | 2005-06-27 | 1,3,6,8-Tetrasubstituted pyrene compound, organic electroluminescent element, and organic electroluminescent display |
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PCT/JP2003/005577 WO2004096945A1 (ja) | 2003-05-01 | 2003-05-01 | 1,3,6,8−四置換ピレン化合物、有機el素子及び有機elディスプレイ |
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US11/166,692 Continuation US20050238920A1 (en) | 2003-05-01 | 2005-06-27 | 1,3,6,8-Tetrasubstituted pyrene compound, organic electroluminescent element, and organic electroluminescent display |
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WO2004096945A1 true WO2004096945A1 (ja) | 2004-11-11 |
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PCT/JP2003/005577 WO2004096945A1 (ja) | 2003-05-01 | 2003-05-01 | 1,3,6,8−四置換ピレン化合物、有機el素子及び有機elディスプレイ |
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US (1) | US20050238920A1 (ja) |
EP (1) | EP1621597B1 (ja) |
JP (1) | JPWO2004096945A1 (ja) |
WO (1) | WO2004096945A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2004096945A1 (ja) | 2006-07-13 |
EP1621597B1 (en) | 2013-09-18 |
US20050238920A1 (en) | 2005-10-27 |
EP1621597A1 (en) | 2006-02-01 |
EP1621597A4 (en) | 2012-02-15 |
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