WO2005022962A1 - 化合物、電荷輸送材料および有機電界発光素子 - Google Patents
化合物、電荷輸送材料および有機電界発光素子 Download PDFInfo
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- WO2005022962A1 WO2005022962A1 PCT/JP2004/011211 JP2004011211W WO2005022962A1 WO 2005022962 A1 WO2005022962 A1 WO 2005022962A1 JP 2004011211 W JP2004011211 W JP 2004011211W WO 2005022962 A1 WO2005022962 A1 WO 2005022962A1
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- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
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- 230000002265 prevention Effects 0.000 description 1
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- 125000003226 pyrazolyl group Chemical group 0.000 description 1
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- 125000005581 pyrene group Chemical group 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical group C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
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- 125000005554 pyridyloxy group Chemical group 0.000 description 1
- RQGPLDBZHMVWCH-UHFFFAOYSA-N pyrrolo[3,2-b]pyrrole Chemical group C1=NC2=CC=NC2=C1 RQGPLDBZHMVWCH-UHFFFAOYSA-N 0.000 description 1
- GZTPJDLYPMPRDF-UHFFFAOYSA-N pyrrolo[3,2-c]pyrazole Chemical group N1=NC2=CC=NC2=C1 GZTPJDLYPMPRDF-UHFFFAOYSA-N 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- WVIICGIFSIBFOG-UHFFFAOYSA-N pyrylium Chemical class C1=CC=[O+]C=C1 WVIICGIFSIBFOG-UHFFFAOYSA-N 0.000 description 1
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- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
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- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical class [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical compound C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-UHFFFAOYSA-N 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000012312 sodium hydride Substances 0.000 description 1
- 229910000104 sodium hydride Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- GVIJJXMXTUZIOD-UHFFFAOYSA-N thianthrene Chemical group C1=CC=C2SC3=CC=CC=C3SC2=C1 GVIJJXMXTUZIOD-UHFFFAOYSA-N 0.000 description 1
- ONCNIMLKGZSAJT-UHFFFAOYSA-N thieno[3,2-b]furan Chemical group S1C=CC2=C1C=CO2 ONCNIMLKGZSAJT-UHFFFAOYSA-N 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000006617 triphenylamine group Chemical group 0.000 description 1
- 125000005580 triphenylene group Chemical group 0.000 description 1
- NLSXASIDNWDYMI-UHFFFAOYSA-N triphenylsilanol Chemical compound C=1C=CC=CC=1[Si](C=1C=CC=CC=1)(O)C1=CC=CC=C1 NLSXASIDNWDYMI-UHFFFAOYSA-N 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/06—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
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- H—ELECTRICITY
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Definitions
- the present invention relates to a novel charge transporting material and a novel compound. More specifically, the present invention relates to a charge transporting material that is stable even after repeated electrical oxidation and reduction, and a highly efficient and long-life organic electric field using the same. It relates to a light emitting element.
- thin-film electroluminescent (EL) devices include inorganic materials such as ZnS, CaS, and SrS, which are group II-VI compound semiconductors, as well as Mn and rare-earth elements (E u, Ce, Tb, Sm, etc.) are commonly used, but EL devices made from the above inorganic materials are
- EL devices using organic thin films have been developed to improve the above problems.
- the type of electrode was optimized to improve the efficiency of carrier injection from the electrode in order to increase the luminous efficiency, and it consisted of a hole transport layer composed of aromatic diamine and an aluminum complex of 8-hydroxyquinoline.
- development of the organic electroluminescent device and a light emitting layer digits set (see non-Patent Document 1:... Appl Phys Lett, 51 Certificates, 913 pp., 1 9 87 years) by, EL using a single crystal, such as a conventional anthracene The luminous efficiency has been greatly improved compared to the device.
- Non-Patent Document 2 J. Appl. Phys., 65, 3610, 1989
- the luminous efficiency has been improved and the luminescence wavelength has been converted.
- Non-Patent Document 4 Nature, 395, 151, 1998.
- the iridium complex (T-2) shown below is doped into the light-emitting layer to further improve green light emission efficiency (Non-Patent Document 5: Appl. Phys. Lett., 75 vol. , P. 4, 1999).
- Non-Patent Document 6 Jpn. J. Appl. Phys., 38, L1502, 1999, and it is difficult to realize highly efficient display elements.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-123983 proposes a pyridine compound represented by the following compounds as a material for an electron transport layer or a light emitting layer of an organic electroluminescent device.
- a compound having a unit having strong coordination ability such as a biviridyl group
- a compound having a unit having strong coordination ability such as a biviridyl group
- Non-Patent Document 7 (Collect. Czech. Chem. Commun. (Vol. 57) (1992) proposes a fluorescent material represented by the following general formula.
- the organic electroluminescent devices reported so far basically emit light by a combination of a hole transport layer and an electron transport layer.
- the holes injected from the anode move through the hole transport layer, and the electrons injected from the cathode move through the electron transport layer,
- the principle is that recombination occurs near the interface between the two layers to excite the hole transport layer and / or the electron transport layer to emit light.
- An element having improved luminous efficiency is generally used.
- a hole blocking layer in contact with the cathode side interface of the light-emitting layer may be provided for the purpose of promoting exciton generation in the light-emitting layer to increase the efficiency of light emission and the purity of the emission color.
- the hole mobility tends to exceed the electron mobility.
- the holes do not contribute to light emission and pass through to the cathode side.
- the electron transport layer such as a (aluminum complex of 8-hydrin p Kishikinorin)
- a blue light emitting device and phosphorescence hole confinement into the light emitting layer is difficult
- the need for a hole blocking layer is high.
- Patent Document 2 Japanese Patent Laid-Open No. 2-195683 discloses that a hole blocking layer having an ionization potential higher than that of the light emitting layer is provided.
- Patent Document 3 Japanese Patent Laid-Open No. 9-876166 proposes the use of silacyclopentadiene. However, none of them had sufficient driving stability.
- Factors of this drive deterioration include thermal degradation caused by the low glass transition temperature (Tg) of the hole blocking material, and electrochemical degradation in which the hole blocking material is reduced and oxidized by injection of electrons and holes. Factors are pointed out.
- High-efficiency phosphorescent devices using iridium complexes as luminescent dyes include Balq (aluminum (III) Dis (2-methyl-8-qumolinato) 4-phenylphenolate) and oAlq (aluminum (III) bis (2-methyl Anoremidium complex-based hole blocking materials such as -8-quinolinato) triphenylsilanolate) have been actively used, and have achieved a certain life extension (see Non-Patent Document 8: Appl. Phys. Lett., 81). Vol., P. 162, 2002).
- the above compounds have insufficient hole-blocking ability, so that the luminous efficiency of the device is insufficient or some of the holes pass through the hole-blocking material and escape to the electron transport layer. Therefore, there is a problem that the oxidative deterioration of the electron transport layer material occurs.
- rapid recombination of charges in the light-emitting layer and realization of high luminous efficiency of the dopant, or prevention of holes passing through the light-emitting layer from escaping to the electron transport layer and
- the hole-blocking material itself must have electrical oxidation-reduction durability, and further improvements in materials and device structures for fabricating devices with high luminous efficiency and stability are desired. I was
- the present inventor has provided a charge transporting material having excellent electron transporting properties, excellent electrical oxidation-reduction durability, and a wide oxidation-reduction potential difference, and an organic electric field having high luminous efficiency and high driving stability.
- An object is to provide a light-emitting element.
- the present invention relates to a compound containing two or more pyridine rings substituted in the 2, 4, 6-position in the molecule, wherein the pyridine rings are not substantially conjugated to each other.
- a charge transport material comprising a compound (provided that the 3,5-position of the pyridine ring may be substituted) and an organic electroluminescent device using the charge transport material.
- a compound that does not become a planar structure when it adopts the most stabilized structure means that the compound has a structure that cannot take a substantially single planar structure as the most stabilized structure of the molecule.
- the ⁇ - ⁇ stacking interaction between them is suppressed, and it is excellent in amorphousness, solubility and sublimation.
- the absorption maximum wavelength and the fluorescence emission maximum wavelength are lower than in the solution state (the state in which molecules are dispersed). Can be suppressed from increasing.
- the phenomenon that the triplet excitation level decreases and the phenomenon that the electro-oxidation-reduction potential difference decreases can be suppressed.
- the fact that a planar structure is obtained when the most stabilized structure is adopted means that the molecule has a substantially single planar structure as the most stabilized structure of the molecule.
- the pyridine ring when the pyridine rings are connected to each other via an m-phenylene group, the pyridine ring has a structure in which lone pairs of electrons on the nitrogen atom cannot be directly conjugated to each other. Since a conjugated structure can be formed between the ren group and the pyridine ring, the redox potential difference is large and the reversibility is particularly excellent. In addition, the pyridine ring has excellent amorphous properties by breaking the symmetry, and has excellent solubility in organic solvents. Therefore, it exhibits stable film formation without crystallization when the film is formed.
- the organic electroluminescent device using the charge transport material of the present invention it is possible to emit light with high luminance and high efficiency, and the stability of the device is improved.
- the charge transport material of the present invention has excellent heat resistance, film forming property, charge transport property, and light emitting property. It is also applicable as a hole blocking material or the like.
- the organic electroluminescent device according to the present invention can be used as a flat panel display (for example, a wall-mounted television for an OA computer), a vehicle-mounted display device, a mobile phone display, or a light source utilizing the features of a surface light emitter (for example, a light source of a copier). It can be applied to liquid crystal displays and backlight sources for instruments, display boards, and sign lights, and its technical value is great.
- the compounds of the present invention have essentially excellent oxidation-reduction stability, they are useful not only for organic electroluminescent devices but also for electrophotographic photoreceptors.
- the compound of the present invention is excellent in amorphous property, solubility, heat resistance and durability in addition to the high performance of the charge transport material of the present invention. Therefore, not only for charge transport materials and _L, but also for light emitting materials, solar cell materials, battery materials (electrolytes, electrodes, separators, stabilizers, etc.), medical, coating materials, coating materials It is also useful for organic semiconductor materials, toiletry materials, antistatic materials, and thermoelectric element materials.
- FIG. 1 is a schematic sectional view showing an example of the organic electroluminescent device.
- FIG. 2 is a schematic sectional view showing another example of the organic electroluminescent device.
- FIG. 3 is a schematic sectional view showing another example of the organic electroluminescent device.
- the symbols in the figure are 1 for the substrate, 2 for the anode, 3 for the anode buffer layer, 4 for the hole transport layer, 5 for the light emitting layer, 6 for the hole blocking layer, 7 for the electron transport layer, and ⁇ 8 indicates a cathode.
- the charge transport material of the present invention is a compound containing two or more pyridin rings substituted in the 2, 4, 6-position in the molecule, and the pyridine rings are not substantially conjugated to each other. And a charge transport material comprising a compound characterized by the following. However, the 3, 5-position of the pyridine ring may be substituted.
- the charge transporting material of the present invention is very electrically stable because it contains a pyridin ring substituted in the 2, 4, 6-position in the molecule. Therefore, when the charge transport material of the present invention is used for an organic electroluminescent device or the like, a device with improved stability can be obtained. Further, as will be described later, since the pyridine rings in the molecule are not conjugated to each other, it becomes difficult to reduce the oxidation-reduction potential difference of the compound. The fact that the pyridine rings in the molecule are not conjugated to each other is as described in detail in the example of linking group Q below.
- the pyridine ring has two or more pyridine rings in the molecule.However, since there is a possibility that sublimability and solubility may be reduced, and a high purification may be difficult, eight pyridine rings may be used. The following is preferred.
- the molecular weight of such a charge transporting material is usually 400 or less, preferably 300 or less, more preferably 200 or less, and usually 200 or more, preferably 300 or more. It is more preferably at least 400.
- the molecular weight exceeds the upper limit, the sublimation property is remarkably reduced, which hinders the use of a vapor deposition method when manufacturing an electroluminescent device, or lowers the solubility in an organic solvent or a synthesis process.
- Purification of the material may become difficult with the increase in the impurity components generated in the process, and when the molecular weight falls below the lower limit, the glass transition temperature, the melting point, the vaporization temperature, Heat resistance may be significantly impaired due to a decrease in film forming properties and the like.
- the hole blocking property which is one of the important properties, is determined by the diarylamine skeleton in the molecule. Because it tends to be impaired. Preferably do not contain the skeleton. Further, although not as good as the diarylamine skeleton, it has a strong hole transporting property and, because it has a reduced hole blocking property, the aryloxy skeleton and the arylsulfide skeleton that do not include the arylsulfide skeleton are more likely to be used. preferable.
- the diarylamine skeleton has at least an arbitrary aromatic ring as a substituent on a nitrogen atom (in the present invention, an aromatic hydrocarbon and an aromatic heterocycle are sometimes collectively referred to as an “aromatic ring”).
- an aromatic hydrocarbon and an aromatic heterocycle are sometimes collectively referred to as an “aromatic ring”.
- a 2-substituted amine skeleton such as a diphenylamine skeleton, a phenylnaphthyl skeleton, and a triphenylamine skeleton.
- substituents are bonded to each other to form a ring, such as a carbazole skeleton, an N-phenylcarbazole skeleton, an N-phenylindole skeleton, and the like.
- a heavy bond eg, athalidine, phenazine, etc.
- the aryloxide skeleton refers to an oxoxide skeleton in which an aromatic ring is substituted as a substituent on an oxygen atom, and examples thereof include a phenyloxide skeleton and a diphenyloxide skeleton.
- substituents are bonded to each other to form a ring, and examples thereof include a benzofuran skeleton, a dibenzofuran skeleton, and a dibenzo [1,4] dioxin skeleton. Both are one of the skeletons with strong hole transport properties.
- the aryl sulfide skeleton refers to a sulfide skeleton in which at least one aromatic ring is substituted as a substituent on a sulfur atom, such as a phenyl sulfide skeleton and a diphenyl sulfide skeleton.
- substituents are bonded to each other to form a ring, and examples thereof include a benzothiophene skeleton, a dibenzothiophene skeleton, and a thianthrene skeleton. Both are one of the skeletons with strong hole transport properties.
- the charge transporting material of the present invention when used as a host material constituting a light emitting layer, it is considered that a compound having both electron transporting performance and hole transporting performance is suitable. . In that case, a hole transporting substituent is necessary. Therefore, it is preferable that the compound has a diarylamine skeleton or a carbazole ring as a substituent that imparts hole transport performance in the molecule of the compound.
- the compound in order to balance the electron transporting performance of the pyridine ring, which is the main skeleton of the compound used in the charge transporting material of the present invention, the compound preferably has at least one carbazole ring, and preferably has at least two pyridine rings.
- the number is more preferably 6 or less, more preferably 4 or less, and particularly preferably 3 or less.
- the carbazole rings may be conjugated to each other, but the pyridine ring and the carbazole ring in the molecule are preferably not conjugated to each other.
- the charge transport material of the present invention contains, in the molecule, 2 to 8 pyridyl groups selected from the group consisting of an optionally substituted 2-pyridyl group and a 4-pyridyl group, It is preferable that the pyridyl group is a charge transport material composed of a compound characterized in that all of the pyridyl groups are bonded to the linking group Q, and the pyridyl groups are not substantially conjugated to each other via the linking group Q. .
- the substituents possessed by each may be the same or different.
- one molecule contains a plurality of 4-pyridyl groups
- the substituents on each may be the same or different.
- the 2, 4, and 6-positions of all pyridine rings contained in one molecule are bonded to the linking group Q or any substituent.
- the linking group Q is defined as ⁇ all of the pyridyl groups in the molecule are bonded to the linking group Q, and any two of the pyridyl groups are linked together. It is not substantially conjugated via the group Q ”, and may be divalent to octavalent, and is not particularly limited as long as this is satisfied.
- pyridyl groups are conjugated via the linking group Q means, for example, that two or more pyridyl groups in the molecule are directly bonded,
- G to G 3 each independently represent a hydrogen atom or a force representing an arbitrary substituent, or a part of an aromatic hydrocarbon ring or an aromatic heterocyclic ring. That is, the present invention relates to This does not apply to the case of conjugate.
- the linking group Q and the two or more pyridyl groups bonded via the linking group Q are substantially on the same plane. If the structure cannot exist above (for example, when the linking group Q ′ is an “o-phenylene group and two pyridyl groups are bonded to it, etc.),“ (pyridyl group , Through the linking group Q) are not substantially conjugated ”and are included in the present invention.
- linking groups Q one in the general formula (I) described below Z 1 _ Q 0 - Z t -, one - Q 0 _ Z 2 -, and one Z 2 - Q 0 - Z 2 - and the like
- the present invention is not limited to these.
- the redox potential difference of the compound is reduced, and the hole acceptability on the pyridine ring is improved. Therefore, it is considered that oxidation deterioration is promoted.
- the charge transport material of the present invention includes a compound represented by the following general formula (I).
- R 5 and R 8 each independently represent a hydrogen atom or an optional substituent
- R 2 , R 4 , R 6 and R 7 each independently represent an arbitrary substituent Represents a group.
- Z T represents a direct bond or a divalent linking group having an electron which can be conjugated to ring A.
- Z 2 represents a direct bond or a divalent linking group having an electron which can be conjugated to ring B.
- Linking group Q. represents an (m + n) -valent linking group that can render any two selected from the group consisting of ring A and ring B contained in one molecule substantially non-conjugateable.
- m is an integer from 0 to 8
- n is an integer from 0 to 8
- the sum of m and n is an integer from 2 to 8.
- a plurality of 1 ⁇ to R 8 contained in one molecule may be the same or different, and a plurality of 1 ⁇ to R 8 may be contained in one molecule.
- Z 2 may be the same or different.
- any two pyridyl groups selected from the group consisting of ring A and ring B contained in one molecule are 1-Q.
- One Z 2 _ or one Z 2 — Q. are not conjugated to each other via one Z 2 —
- Z 2 in the general formula (I) is a direct bond or a linking group Q. Any group can be applied as long as it is a linking group having a conjugated electron that binds to the ring A or the ring B.
- alkene group optionally having a substituent (alkene-derived group)
- An aromatic hydrocarbon group which may have a substituent An aromatic heterocyclic group which may have a substituent,
- Z 1 and Z 2 are preferably a direct bond, an alkene group which may have a substituent, an alkyne group which may have a substituent, or a substituent, from the viewpoint of electrical reduction durability.
- An aromatic hydrocarbon group which may have a direct bond or a substituent in view of a high triplet excitation level and a large oxidation-reduction potential difference. It is.
- the molecular weight of each of Z 1 and Z 2 , including its substituent, is preferably 400 or less, more preferably 250 or less. More preferred examples of the linking group or Z 2 are shown below.
- L 6 to L 8 each independently represent an alkyl group, an aromatic hydrocarbon group, or an alkyl-substituted aromatic hydrocarbon group.
- alkyl groups having about 1 to 6 carbon atoms, such as methyl group, ethyl group, isopropyl group, and tert-butyl group; and about 6 to 18 carbon atoms, such as phenyl group, naphthyl group, and fluorenyl group.
- any of the above structures may have a substituent other than L 6 to L 8 , but if it strongly affects the electronic state of the pyridine ring or the like to which it is bonded, the redox potential difference Therefore, it is preferable to select a group that has both a small electron donating property and a small electron withdrawing property and that does not easily spread the intramolecular conjugate length.
- Specific examples of such a group also include an alkyl group, an aromatic hydrocarbon group, an alkyl-substituted aromatic hydrocarbon group, and the like.
- Specific examples include the groups described above as L 6 to L 8. And the same groups as mentioned above.
- two or more L 6 to L 8 in one molecule may be the same or different.
- Z-1 direct bonding
- Z-2 to 21, 28, 29, 31 to 35, 48 ⁇ 52, 56 ⁇ 60
- Z_1 direct bonding
- Z—2 3, 4, 5, 8, 10, 12, 12, 15, 16, 17, 17, 19, 28, 29, 3, 1, 3, 34, 52, 56 to 58 are more preferable
- Z-1 direct bonding
- Z-2, 5, 8, 12, 19, 28, 29 are more preferable
- Z-1 Direct coupling
- Linking group Q Represents an (m + n) -valent linking group that renders any two selected from the group consisting of ring A and ring B contained in one molecule substantially incapable of conjugation.
- alkane-derived groups An alkene group which may have a substituent,
- a boryl group which may have a substituent which may have a substituent
- a phosphino group which may have a substituent
- Examples thereof include an aromatic hydrocarbon group or a pyridylene group (a divalent group derived from a pyridine ring), and particularly preferably an aromatic hydrocarbon group which may have a substituent.
- the molecular weight of the compound, including its substituents, is preferably 400 or less, more preferably 250 or less.
- Q When is a pyridylene group, it is preferable that and and / or Z 2 have a group that cannot conjugate pyridine rings.
- Ra also include the same groups as those described below as 1 ⁇ to 18 and preferred groups are also the same. Below, the linking group Q. Preferred specific examples are shown below, but are not limited thereto. 2Z
- Lu each independently represent an alkyl group, an aromatic hydrocarbon group, or an alkyl-substituted aromatic hydrocarbon group.
- an alkyl group having about 1 to 6 carbon atoms such as a methyl group, an ethyl group, an isopropyl group, and a tert-butyl group; about 6 to 18 carbon atoms, such as a phenyl group, a naphthyl group, and a fluore) group
- an alkyl-substituted aromatic hydrocarbon group having about 7 to 30 carbon atoms in total such as a tolyl group, a mesityl group, and a 2,6-dimethylphenyl group.
- the above structure may have in addition to the substituents of either L 1 () to L u, but when itself will exert a strong influence on the electron state of the pyridine ring or the like for coupling, oxidation Since the reduction potential difference may be narrowed, it is preferable to select a group that has low electron-donating and electron-withdrawing properties, and that does not easily spread the intramolecular conjugate length.
- Specific examples of such a group also include an alkyl group, an aromatic hydrocarbon group, an alkyl-substituted aromatic hydrocarbon group, and the like. It includes the same groups as mentioned above as you and L u. In the case of a compound having two or more of the above structures in one molecule, two or more 1 ⁇ contained in one molecule. And Lu may be the same or different.
- Q-1 to 4 7 to 13, 19 to 23, 29, 3: ⁇ 43, 45, 51 ⁇ 61 are preferred, and Q-1, 8 ⁇ 13, 19, 20, 21, 23, 34, 35 to 42, 45, 55 to 61 are more preferable, and Q-1,8 to 12,20,21,23,34,35,45,58 , 61 are more preferred, and Q_l, 11, 12, 23, 35 are most preferred.
- I ⁇ , R 3 , R 5 and R 8 each independently represent a hydrogen atom or an arbitrary substituent
- R 2 , R 4 , R 6 and R 7 each independently represent Represents an optional substituent.
- an optional group that can be used for 1 ⁇ to R 8 specifically, for example, an alkyl group which may have a substituent (preferably a linear or branched alkyl group having 1 to 8 carbon atoms, Examples include methyl, ethyl, n-propyl, 2-pro, pill, n-butyl, isoptyl, and tert-butyl groups.)
- alkenyl group which may have a substituent (preferably an alkenyl group having 2 to 9 carbon atoms, for example, butyl, aryl, 1-butenyl group, etc.), and a substituent
- a good alkynyl group preferably an alkynyl group having 2 to 9 carbon atoms, such as ethynyl and propargyl groups
- an aralkyl group which may have a substituent (preferably having 7 carbon atoms).
- aralkyl groups such as a benzyl group.
- amino group which may have a substituent preferably an alkylamino group which has one or more alkyl groups having 1 to 8 carbon atoms which may have a substituent (for example, methylamino, dimethylamino, getylamino, dibenzylamino); Groups).
- An arylamino group having an aromatic hydrocarbon group having 6 to 12 carbon atoms which may have a substituent for example, phenylamino, diphenylamino, ditolylamino group, etc.
- a heteroarylamino group having a 5- or 6-membered aromatic heterocyclic ring which may have a substituent including, for example, a pyridylamino, chenylamino, dichenylamino group and the like;
- An acylamino group which may have a substituent and has an acyl group having 2 to 10 carbon atoms (for example, acetylamino, benzoylamino and the like are included)]
- An alkoxy group which may have a substituent preferably an alkoxy group having 1 to 8 carbon atoms which may have a substituent, for example, methoxy, ethoxy, butoxy group, etc.
- An aryloxy group which may have a substituent preferably one having an aromatic hydrocarbon group having 6 to 12 carbon atoms, for example, phenyloxy, 11-naphthyloxy, 2-naphthyloxy group and the like).
- a heteroaryloxy group which may have a substituent (preferably one having a 5- or 6-membered aromatic heterocyclic group, and includes, for example, a pyridyloxy group, a cheloxy group, etc.),
- An optionally substituted acyl group (preferably an optionally substituted acryl group having 2 to 10 carbon atoms, for example, formyl, acetyl, benzoyl, etc.),
- Optionally substituted alkoxycarbonyl group preferably, optionally substituted alkoxycarbonyl group having 2 to 10 carbon atoms, for example, methoxycarbonyl, ethoxycarbonyl group, etc.
- An aryloxycarbonyl group which may have a substituent preferably an aryloxycarbonyl group having 7 to 13 carbon atoms which may have a substituent, for example, a phenoxyl carbonyl group; Etc.
- alkylcarbonyloxy group which may have a substituent preferably an alkylcanolepoloxy group having 2 to 10 carbon atoms which may have a substituent, and includes, for example, an acetoxy group and the like;
- Halogen atoms especially fluorine or chlorine atoms
- alkylthio group which may have a substituent preferably an alkylthio group having 1 to 8 carbon atoms, for example, a methylthio group, an ethylthio group, etc.
- An arylthio group which may have a substituent preferably an arylthio group having 6 to 12 carbon atoms, for example, a phenylthio group, an 11-naphthylthio group and the like
- a sulfol group which may have a substituent (for example, including a mesyl group and a tosyl group),
- a silyl group which may have a substituent for example, trimethylsilyl group, triphenylsilyl group and the like;
- a boryl group which may have a substituent for example, a dimesitylpolyl group or the like is included,
- a phosphino group which may have a substituent for example, a diphenylphosphino group and the like are included
- An aromatic hydrocarbon group which may have a substituent for example, a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, a perylene ring, a tetrasedi ring, a pyrene ring, a benzopyrene ring, a tarisene ring, a triphenylene ring, a fluoranthene ring
- a substituent for example, a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, a perylene ring, a tetrasedi ring, a pyrene ring, a benzopyrene ring, a tarisene ring, a triphenylene ring, a fluoranthene ring
- an optionally substituted aromatic heterocyclic group e.g., a furan ring, a benzofuran ring, a thiophene ring, a benzothiophene ring, a pyrrole ring, a pyrazole ring, an imidazole ring, an oxaziazole ring, an indole ring, a sorbazole ring, Piro mouth imidazole ring, pyrrolopyrazole ring, pyrrolopyrrole ring, chenopyrole ring, chenothofen ring, floppyrrole ring, furofuran ring, thienofuran ring, benzoisoxazole ring, benzisothiazole ring, benzimidazole ring, pyridine ring, pyrazine 5- or 6-membered monocyclic or 2- to 5-ring such as ring, pyridazine ring, pyrimidine ring
- the molecular weight of R i R s, including its substituents, is preferably at most 400, more preferably at most 250, respectively. (Substituent of R ⁇ Rs)
- the substituents which these may have are not particularly limited as long as the performance of the charge transporting material of the present invention is not impaired, but are preferably an alkyl group, an aromatic hydrocarbon group, or an alkyl-substituted aromatic hydrocarbon group. . Specific examples thereof include an alkyl group having about 1 to 6 carbon atoms such as a methyl group, an ethyl group, an isopropyl group, and a tert-butyl group; and a carbon group having 6 to 6 carbon atoms such as a phenyl group, a naphthyl group, and a fluorenyl group. About 18 aromatic hydrocarbon groups; alkyl-substituted aromatic hydrocarbon groups having a total carbon number of about 7 to 30, such as a tolyl group, a mesityl group, and a 2,6-dimethylphenyl group.
- R 2, R 4, R 6 Oyopi 1 7, because the may be any group improves the viewpoint and heat resistance improving ,, electro-oxidation - reducing durability, Hajime Tamaki (
- the aromatic hydrocarbon group and the aromatic heterocyclic group may be collectively referred to as “aromatic ring group”.).
- R 8 is an aromatic ring group
- 1 ⁇ to L 3 each independently represent an alkyl group, an aromatic hydrocarbon group, or an alkyl-substituted aromatic hydrocarbon group.
- L 4 and L 5 each independently represent a hydrogen atom , An alkyl group, an aromatic hydrocarbon group, or an alkyl-substituted aromatic hydrocarbon group.
- aromatic hydrocarbon group or alkyl-substituted aromatic hydrocarbon group specifically, an alkyl group having about 1 to 6 carbon atoms such as a methyl group, an ethyl group, an isopropyl group and a tert-butyl group; An aromatic hydrocarbon group having about 6 to 18 carbon atoms, such as a phenyl group, a naphthyl group, and a fluorenyl group; a total of 7 to 3 carbon atoms, such as a tolyl group, a mesityl group, and a 2,6-dimethylphenyl group And about 0 alkyl-substituted aromatic hydrocarbon groups.
- the both structures may have in addition to the substituents L 5, but when thus exerts a strong influence on the electron state of the pyridine ring to which it is bound, the redox potential Therefore, it is preferable to select a group that has both a small electron donating property and a small electron withdrawing property and that hardly causes the extension of the intramolecular conjugation length.
- a group that has both a small electron donating property and a small electron withdrawing property and that hardly causes the extension of the intramolecular conjugation length.
- Specific examples of such a group also include an alkyl group, an aromatic hydrocarbon group, an alkyl-substituted aromatic hydrocarbon group, and the like.
- two or more 1 ⁇ to 5 in one molecule may be the same or different.
- R—: L to 6, 10 to 13, 33, 34, 38, 45, and 48 are preferable, and R— :! -6,48 are more preferable, and R_l, 4-6,48 are most preferable.
- R 3 , R 5 and R 8 are, for example, when the charge transport material of the present invention is applied to a light emitting layer material of an organic electroluminescent element, from the viewpoint of limiting molecular vibration and not impairing luminous efficiency,
- An alkyl group which may have a substituent, or an aromatic hydrocarbon group which may have a substituent is preferable, and a large oxidation potential or a long From the viewpoint of increasing the life (excellent oxidation-reduction resistance), a hydrogen atom or an aromatic hydrocarbon group is more preferable, and a hydrogen atom or a phenyl group is particularly preferable.
- the compound represented by the general formula (I) is most characterized in that it has two or more pyridine rings at positions that cannot be substantially conjugated to each other in a molecule. It exhibits an electron transporting property and a wide redox potential difference.
- the pyridine ring is too large, the basicity of the compound becomes too strong, and if the pyridine ring is contained in the light-emitting layer or a layer in contact with the light-emitting layer, there is a risk that ligand exchange may occur due to a long-time application of an electric field.
- Q from such a viewpoint.
- M and Q represent the number of rings A bonded to and bonded to and.
- Bound sum of the n representing the number of bound ring B in Z 2 and Z 2 are laid like an integer of 2 ⁇ .8 and from 2 to 6, still more preferably 2 to 4, is 2-3 Most preferred.
- m is an integer of 0 to 8, preferably 0 to 4.
- n is an integer of 0 to 8, preferably an integer of 0 to 4.
- n is an integer of 1 or more from the viewpoint of increasing the oxidation-reduction potential difference and the durability of repeated oxidation-reduction.
- a 2-pyridyl group (g
- n or m is 0.
- a pyridin ring having a different substituent is used dare (that is, m And n are both integers greater than or equal to 1).
- n or m is 0 and only one of ring A and ring B is present, only the substituent (1 ⁇ to 4 or R 5 to R 8 ) on ring A or ring B is different for each ring.
- the selection of the substituent may be devised so that a substituted pyridine ring having slightly different electrochemical characteristics may coexist in the molecule. This is effective as a fine adjustment means.
- the charge transporting material of the present invention is used for an organic electroluminescent device, 1) when used as a host material constituting a light emitting layer, it must have both an excellent hole transporting property and an electron transporting property.
- the compound has an electron-donating substituent (eg, an alkyl group, an amino group, an alkoxy group, etc.) in the molecule, and more preferably contains an aromatic amino group.
- an aromatic amino group that is, a diarylamine skeleton.
- the pyridine ring and the electron-donating heteroatom have a structure that cannot be substantially conjugated. When these are conjugated, the charge polarization phenomenon in the molecule becomes remarkable, and the redox potential difference may be reduced, and the triplet excitation level may be reduced.
- the dopant is usually capable of accepting and transporting holes by itself, and the host material dare to transport holes. In some cases, it is not necessary to grant the ability. In this case, it is preferable to adopt a structure that is considered to enhance electron transportability, as described below as 2).
- an electron transporting material and / or a hole blocking material When used as an electron transporting material and / or a hole blocking material, it is desirable to suppress the hole transporting property and enhance the electron transporting property, and to use an electron donating substituent (eg, an alkyl group, an amino group, an alkoxy group) , An aryloxy group, an alkylthio group, an arylthio group, etc.) in the molecule are preferred, and those having no group containing a diarylamine skeleton are more preferred.
- an electron donating substituent eg, an alkyl group, an amino group, an alkoxy group
- Q for the purpose of giving the compound represented by the general formula (I) a moderately wide redox potential difference.
- Is preferably unsubstituted or substituted with a hydrocarbon group, and from the viewpoint of limiting molecular vibration, is more preferably unsubstituted (hydrogen atom), a methyl group, or a phenyl group. Preferably it is unsubstituted (hydrogen atom).
- the molecular weight of the compound represented by the general formula (I) is usually 400,000 or less, preferably 300,000 or less, more preferably 200,000 or less, and usually 200 or more. It is preferably at least 300, more preferably at least 400.
- the molecular weight exceeds the upper limit, the sublimability will be significantly reduced, which may hinder the use of the vapor deposition method when manufacturing an electroluminescent device. If the molecular weight is below the lower limit, the glass transition will occur. Temperature, melting point, vaporization temperature, etc. decrease, so heat resistance may be significantly impaired.
- the compound used for the charge transport material of the present invention can be synthesized by selecting a raw material according to the structure of the target compound and using a known method.
- a pyridine having an aromatic ring group at the 2,6-position is synthesized, and this is synthesized using a halogenating agent such as N-promosuccinimide.
- a halogenated compound is obtained by halogenating the 4-position of the pyridine ring, and the halogen atom is converted into one B (OH) 2 group, one ZnC1 group or one MgBr group, and the halogen atom described above.
- halogenated compounds ( Ra -X) or hydrocarbon compounds having active hydrogen atoms ( Ra -H) can be converted to strong bases such as alkyllithium such as butyllithium, sodium hydride, triethylamine, tert-butoxycalidium, sodium hydroxide (Preferably alkyllithium such as butyllithium), followed by treatment with N, N-dimethylformamide (Organic & Biomolecular Chemistry (2003) 1, 7 1577-1170; Tetrahedron Lett. 42 (2001) ) 37, 6589-6592),
- I C0 2 R group (R is hydrogen atom, chlorine atom, alkyl group, aromatic ring group, amino group) is reduced with lithium aluminum hydride, sodium borohydride, etc., and after alcohol conversion, pyridinium chromate chromate , Manganese dioxide, iodoxybenzoic acid, peroxodisinolephate, 2,3-dichloro-5,6-dicyano-1,4,1 Benzoquinone, etc. to oxidize to CHO (J. Med. Chem. (1990) 33, 2408-2412; Angew. Chem., Int. Ed. 40 (2001) 23, 4395-4397; J. Am. Chem. Soc. (2002) 124, 10, 2245-58.
- Ar-CH3 S (Ar is an aromatic ring group) is treated with o-Ioaylbenzoic acid, Dess-Martin periodinane, Acetoxyiodosylbenzoic acid, etc., and converted directly into Ar_CHO (Am. Chem. Soc. (2002) 124, 10 , 2245-58),
- Ar_CH 3 group (Ar is an aromatic ring group) is converted to Ar—CH 2 OH via Ar—CH 2 Br and Ar—CH 2 OAcO, and then pyridinum chromate chromate, manganese dioxide, iodoxybenzoic acid, etc. (J. Org. Chem. (1993) 58, 3582-3585),
- Ar—C3 ⁇ 4 group Ar is an aromatic ring group
- Ar—CH2Br is brominated with bromine or N-bromosuccinic acid imide to form Ar—CH2Br, and then reacted with 2-nitropropane carboanion reagent, Hexamethylenetetramine, etc.
- Method for converting to Ar_CHO Collect-Czech. Chem. Commun. (1996) 61, 1464-1472; Chem. Eur. J pertain(1996) 2, 12, 1585-1595; J. Chem. Research (S), (1999) 210-211
- Ar—CHBr 2 group (Ar is an aromatic ring group) is converted to Ar—CHO using dialkylamine (Bulletin de La Societe Chmique De France (1966) 9, 2966-2971)
- Rc—C0 2 R group (R is hydrogen atom, chlorine atom, alkyl group, aromatic ring group, amino group) is treated with various alkylating agents (alkyl lithium, dimethyl sulfate, dimethyl sulfoxide, etc.) R c -CO-CH 2 RM method (J. Am. Chem. Soc. (1959), 81, 935-939; J. Am. Chem. So (1961) 83, 4668S Tetrahedron Lett. (1967) 1073-; J. Chem. So (i960) 360 J. Chem. Soc. 'Perkin Trans. 1 (1977) 680 ;
- the compound can be easily synthesized by a method in which an acylating agent such as acid chloride is allowed to act in the presence of a Lewis acid catalyst such as aluminum chloride (a very common Friedel-Crafts reaction).
- an acylating agent such as acid chloride
- a Lewis acid catalyst such as aluminum chloride
- the desired product is filtered or extracted from the reaction product according to a conventional method, and then separated from the solvent by concentration, and then, if necessary, purified by a method such as recrystallization or column chromatography to obtain the compound of the present invention. Can be obtained.
- the linking group ZZ 2 , Qo, Ri to R 8 is a heterocyclic ring
- its precursor may be used as a commonly available reagent or “Heterocyclic Chemistry—Basics of Pharmaceuticals” (Kunieda et al., 2002) And “: Eeterocyclic Chemistry J (4th edition, 2000, JA Joule and K. Mills, Blackwell Science)".
- the precursors are synthesized by the above-mentioned synthesis method, or “Pajladium in Heterocyclic Chemistry: A guide lor the Synthetic Chemist;” (second edition (2002), Jie Jack Li and Gordon W.
- the charge transporting material of the present invention When the charge transporting material of the present invention is applied to an organic electroluminescent device, particularly excellent luminous efficiency and driving life are obtained when an organometallic complex which is a phosphorescent dye is used as a dopant in a light emitting layer.
- an organometallic complex which is a phosphorescent dye is used as a dopant in a light emitting layer.
- the organometallic complex is one in which a 2-arylpyridine-based ligand and a metal element are linked by a carbon-metal sigma bond and a nitrogen-metal coordination bond, the effect is obtained.
- the organometallic complex preferably has a 2-arylpyridine-based ligand.
- the light emission mechanism of the resulting complex includes at least a substance accompanied by charge transfer from a ligand orbital to a metal atomic orbital.
- the charge transport material of the present invention is applied to the same layer as the dopant (light emitting layer) and to Z or a layer adjacent thereto (hole blocking layer and / or electron transport layer), the charge transport material becomes The physicochemical similarity with the pyridine-pyridine ligand, the electrochemical similarity, the similarity of the triplet excited level, etc.
- the host This improves the efficiency of energy transfer from the molecule to the dopant and reduces the probability of exciton deactivation between the light-emitting layer and the hole-blocking layer.
- the charge transporting material of the present invention has high charge transporting properties, it can be suitably used as a charge transporting material in electrophotographic photoreceptors, organic electroluminescent devices, photoelectric conversion devices, organic solar cells, organic rectifiers, and the like. In particular, since it has excellent electron transport properties, it is suitable as an electron transport compound.
- an organic electroluminescent element which has excellent heat resistance and can be driven (emitted) stably for a long period of time can be obtained, and thus is suitable as an organic electroluminescent element material.
- the organic electroluminescent device of the present invention will be described.
- the organic electroluminescent device of the present invention has an anode, a cathode, and an organic light-emitting layer (hereinafter sometimes simply referred to as a “light-emitting layer”) provided between these two electrodes. It is characterized by having a layer containing.
- the device of the present invention may have at least an anode, a cathode, and a light emitting layer provided between these two electrodes.
- the charge transporting material of the present invention has a wide optical band gap and an appropriate electron transporting property, and is therefore used particularly as a layer provided in contact with the light emitting layer on the cathode side (hereinafter referred to as “hole blocking layer”). Then it is effective.
- the charge transport material of the present invention can be used for any of the layers constituting the organic electroluminescent device.
- the organic light-emitting layer hereinafter, may be simply referred to as a light-emitting layer
- an electron-transporting layer provided between the light-emitting layer and the cathode.
- it is not necessary to be in contact with the light emitting layer it is preferable to use it as a material for the hole blocking layer in order to effectively utilize the characteristics of the compound used for the charge transport material of the present invention.
- the layer in contact with the light-emitting layer on the cathode side is positive. It is called a hole blocking layer.
- an organic electroluminescent element when used as a material of a light emitting layer, particularly as a host material, an organic electroluminescent element exhibiting high luminous efficiency can be obtained, which is preferable.
- the charge transport material of the present invention when used in a light-emitting layer, it has an appropriate LUMO level derived from a pyridine ring, so that electrons are appropriately injected into the light-emitting layer, and from the hole transport layer. Effective recombination occurs in the light emitting layer with the injected holes. Therefore, it can be used also as a light emitting layer of an organic electroluminescent element having no hole blocking layer. .
- the charge transporting material of the present invention may be used for a plurality of layers, and it is particularly preferable to use the charge transporting material for both the light emitting layer and the hole blocking layer. By using the charge transport material of the present invention for both the light emitting layer and the hole blocking layer, the life of the device can be further extended. Further, a plurality of types of the charge transporting material of the present invention may be used in each layer, and may be used in combination with a charge transporting material other than the charge transporting material of the present invention.
- the charge transport material of the present invention when the charge transport material of the present invention is contained in two or more layers, the charge transport materials contained in these layers may be the same or different.
- one layer between the cathode and the light-emitting layer is referred to as an “electron transport layer”.
- the layer in contact with the cathode is referred to as an “electron injection layer” and the other layers are collectively referred to. This is referred to as “electron transport layer”.
- a layer in contact with the light emitting layer may be particularly referred to as a “hole blocking layer”.
- FIG. 1 is a cross-sectional view schematically showing a structural example of a general organic electroluminescent element used in the present invention, wherein 1 is a substrate, 2 is an anode, 4 is a hole transport layer, 5 is a light emitting layer, and 6 is A hole blocking layer and 8 each represent a cathode.
- the substrate 1 serves as a support for the organic electroluminescent device, and may be a quartz or glass plate, a metal plate or metal foil, a plastic film or sheet, or the like.
- a glass plate or a plate or film of a transparent synthetic resin such as polyester, polymethacrylate, polycarbonate, or polysulfone is preferable.
- a synthetic resin substrate it is necessary to pay attention to gas barrier properties.
- the organic electroluminescent device will be degraded by the outside air passing through the substrate. It is not preferable because it may be performed. Therefore, a method of providing a dense silicon oxide film or the like on at least one surface of the synthetic resin substrate to secure gas barrier properties is also one of the preferable methods.
- the anode 2 is provided on the substrate 1, and the anode 2 plays a role of injecting holes into the hole transport layer 4.
- the anode 2 is usually made of a metal such as aluminum, gold, silver, nickel, palladium, and platinum; a metal oxide such as an oxide of indium and / or tin; a metal halide such as copper iodide; a car pump rack; or It is composed of conductive polymers such as poly (3-methylthiophene), polypyrrole, and polyayulin.
- the anode 2 is often formed by a sputtering method, a vacuum evaporation method, or the like.
- the anode 2 is formed of silver or other metal fine particles, copper iodide or other fine particles, carbon black, conductive metal oxide fine particles, or conductive polymer fine powder, a suitable binder resin solution is used. It can also be formed by dispersing it inside and applying it on the substrate 1. Further, when the anode 2 is formed of a conductive polymer, a polymerized thin film can be formed directly on the substrate 1 by electrolytic polymerization, or can be formed by applying a conductive polymer on the substrate 1 ( Ap pl. Phys. Lett., 60, 2711, 1992).
- the anode 2 usually has a single-layer structure, but may have a laminated structure composed of a plurality of materials if desired.
- the thickness of the anode 2 depends on the required transparency. When transparency is required, it is desirable that the visible light transmittance is usually 60% or more, preferably 80% or more. In this case, the thickness of the anode is usually 5 nm or more, preferably 10 nm or more, and is usually 1000 nm or less, preferably about 500 nm or less. If it is opaque, the thickness of the anode 2 is arbitrary, and the anode 2 may be formed of a metal and serve as the substrate 1 if desired.
- a hole transport layer 4 is provided on the anode 2.
- the material of the hole transport layer it is necessary that the material has a high hole injection efficiency from the anode and can efficiently transport the injected holes.
- the ionization potential is small and transparent to visible light It is required that the material has high hole mobility, high hole mobility, excellent stability, and hardly generate trapping impurities at the time of production or use. Further, it is required that the light emitted from the light emitting layer is not quenched in order to come into contact with the light emitting layer 5 or that an exciplex is formed between the light emitting layer and the light emitting layer so that the efficiency is not reduced.
- the elements are required to have further heat resistance. Therefore, a material having a glass transition temperature T g of 85 ° C. or more is desirable.
- Examples of such a hole transport material include, for example, two or more tertiary amines including two or more tertiary amines represented by 4,4′-bis [N— (1-naphthyl) -1-N-phenylamino] biphenyl.
- Aromatic diamines in which a condensed aromatic ring is substituted with a nitrogen atom JP-A-5-234681), 4,4,, 4,4'-tris (1-naphthylphenylamino) triphenylamine
- Aromatic amine compounds having a starburst structure J. Lum inn., Vol. 72-74, pp.
- aromatic amine compounds composed of tetramers of triphenylamine (Chem. Commu) ⁇ '., 21 p. 75, 1996), 2, 2', 7 '7,-spiro compounds such as spirobifluorene (Synth. Metals, 9) 1 volume, 209 pages, 1997). These compounds may be used alone or, if necessary, as a mixture of two or more.
- the hole transport layer 4 is formed by a usual coating method such as a spray method, a printing method, a spin coating method, a dip coating method, a die coating method, or a wet film forming method such as an ink jet method or a screen printing method. Alternatively, it can be formed by a dry film forming method such as a vacuum evaporation method.
- one or more hole transport materials are added, and if necessary, additives such as a binder resin which does not trap holes and a coating improver are added and dissolved in an appropriate solvent.
- a coating solution is prepared by spin coating, applied onto the anode 2 by a method such as spin coating, and dried to form the hole transport layer 4.
- the hole transporting material is put into a crucible placed in a vacuum vessel, the inside of the vacuum vessel is evacuated to about 10 to 4 Pa with a suitable vacuum pump, and then the crucible is heated. Then, the hole transporting material is evaporated to form a hole transporting layer 4 on the substrate 1 on which the anode 2 is formed, which is placed facing the rutupo.
- the thickness of the hole transport layer 4 is usually at least 5 nm, preferably at least 100 nm, and usually at most 300 nm, preferably at most 100 nm. In order to uniformly form such a thin film, generally, a vacuum deposition method is often used.
- a light emitting layer 5 is provided on the hole transport layer 4.
- the light-emitting layer 5 recombines, between the electrodes to which an electric field is applied, the holes injected from the anode and moving through the hole transport layer and the electrons injected from the cathode and moving through the hole blocking layer 6. It is formed from a light-emitting compound that emits strong light when excited by the compound.
- the light-emitting compound used in the light-emitting layer 5 has a stable thin film shape, exhibits a high luminescence (fluorescence or phosphorescence) quantum yield in a solid state, and transports holes and / or electrons efficiently.
- the compound must be capable of In addition, it is required that the compound be electrochemically and chemically stable, and that the impurities serving as traps hardly occur during production or use.
- Materials satisfying such conditions and forming an organic light emitting layer that emits fluorescence include metal complexes such as an aluminum complex of 8-hydroxyquinoline (Japanese Patent Application Laid-Open No. 59-194393). — Metal complexes of hydroxybenzo [h] quinoline (Japanese
- the charge transport material of the present invention can also be used as this light emitting layer material.
- the charge transport of the present invention may be selected from other electron transporting materials ⁇ hole blocking materials typified by the above-mentioned known materials as materials that can be used for the hole blocking layer 6 or the electron transporting layer 7. It is preferable to select and use a material having an ionization potential greater than the material by 1 eV or more.
- the electron transporting material of the present invention is used for both an organic light emitting layer (sometimes simply referred to as a light emitting layer) and a layer in contact with the cathode side interface of the organic light emitting layer. This is particularly preferable from the viewpoint of driving life.
- the layer in contact with the cathode-side interface is usually a hole blocking layer.
- a material having a difference in ionization potential of 0.1 eV or more is selected from the charge transporting materials defined in the present invention, and each of the light emitting layer and the hole blocking layer is selected.
- a compound having a potential larger than the ionization potential of the dopant by 0.1 eV or more is selected from the charge transporting materials defined in the present invention. Just use it.
- a fluorescent dye for laser such as tamarin with an aluminum complex of 8-hydroxyquinoline as a host material
- This doping method can also be applied to the light emitting layer 5, and as the doping material, various fluorescent dyes other than coumarin can be used.
- Examples of the fluorescent dye that emits blue light include perylene, pyrene, anthracene, coumarin and derivatives thereof.
- Examples of the green fluorescent dye include quinataridone derivatives and coumarin derivatives.
- Yellow fluorescent dyes include rubrene, perimidone derivatives and the like.
- Examples of red fluorescent dyes include DCM compounds, benzopyran derivatives, rhodamine derivatives, benzothioxanthene derivatives, and azabenzothioxanthenes.
- the listed fluorescent dyes and the like can be used as doping materials for the light emitting layer.
- the amount of the fluorescent dye is doped into the host material, 10-3 wt. / 0 or more is preferred, 0.1 weight. / 0 or more is more preferable. Also 10 weight. / 0 or less, more preferably 3% by weight or less. If the value is below the lower limit, it may not be possible to contribute to the improvement of the luminous efficiency of the device. If the value exceeds the upper limit, the concentration may be quenched, and the luminous efficiency may be reduced. ,
- a phosphorescent light-emitting layer is usually formed containing a phosphorescent dopant and a host material.
- the phosphorescent dopant include an organometallic complex containing a metal selected from Groups 7 to 11 of the periodic table.
- the charge transporting property having a T 1 higher than T 1 (the lowest excited triplet level) of the metal complex is exemplified. It is preferable to use an organic compound as the host material.
- the metal preferably includes ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, iridium, platinum, and gold.
- Preferred examples of these organometallic complexes include compounds represented by the following general formula (X) or general formula (VI).
- M represents a metal
- q represents a valence of the metal
- L and L ′ represent a bidentate ligand
- j represents 0 or 1 or 2.
- R 94 and R 95 represent a hydrogen atom, a halogen atom, or ' Alkyl group, aralkyl group, alkenyl group, cyano group, amino group, acyl group, alkoxyl group, alkoxyl group, alkoxyl group, alkylamino group, aralkylamino group, haloalkyl group, hydroxyl group, aryloxy group, substituent Represents an aromatic hydrocarbon group or an aromatic heterocyclic group which may have
- R 92 and R 93 represent a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkenyl group, a cyano group, an amino group, an acyl group, an alkoxycarbonyl group, a carboxyl group, an alkoxy group, an alkylamino group, an aralkylamino group, a haloalkyl group, It represents a hydroxyl group, an aryloxy group, an aromatic hydrocarbon group which may have a substituent or an aromatic heterocyclic group, and may be linked to each other to form a ring. )
- the bidentate ligands L and L ′ in the general formula (X) each represent a ligand having the following partial structure.
- Ring A 2 and ring A 2 are nitrogen-containing R,, R,, and R '"" each represents a halogen atom; an alkyl group; an alkenyl group; an alkoxyl group; a methoxy group; A aryloxy group; a dialkylamino group; a diarylamino group; a carbazolyl group; an acyl group; a haloalkyl group or a cyano group.
- M 4 represents a metal
- w represents a valence of the metal
- ring A 1 ′′ represents an aromatic hydrocarbon group which may have a substituent
- ring A 2 has a substituent. Represents a nitrogen-containing aromatic heterocyclic group which may be substituted.
- M 5 represents a metal
- w represents a valency of the metal
- ring Al ⁇ represents an aromatic hydrocarbon group or an aromatic heterocyclic group which may have a substituent
- Ring A 1 ′′ and ring Al each independently have a substituent.
- Ring A 2 and ring A 2 ′ each independently represent a nitrogen-containing aromatic heterocyclic group which may have a substituent. .
- phenyl As the ring A 1 and the ring A 1 ′ of the compounds represented by the general formulas (Va), (Vb) and (Vc), phenyl, biphenyl, naphthyl, anthryl, Examples thereof include a phenyl group, a furyl group, a benzophenyl group, a benzofuryl group, a pyridyl group, a quinolyl group, an isoquinolyl group, and a carbazolyl group.
- a pyridyl group, a pyrimidyl group, a pyrazyl group, a triazyl group, a benzothiazole group, a benzoxazole group, and a benzoyl group are preferable.
- Examples include a midazole group, a quinolyl group, an isoquinolyl group, a quinoxalyl group, or a phenanthridyl group.
- the substituents which the compounds represented by the general formulas (Va), (Vb) and (Vc) may have are, for example, a halogen atom such as a fluorine atom; and a carbon atom having 1 to 6 carbon atoms such as a methyl group and an ethyl group.
- An alkyl group having 2 to 6 carbon atoms such as a Bier group; an alkoxyl group having 2 to 6 carbon atoms such as a methoxycarbonyl group or an ethoxycarbon group; a methoxy group or an ethoxy group; An alkoxy group having 1 to 6 carbon atoms; an aryloxy group such as a phenoxy group or a benzyloxy group; a dialkylamino group such as a dimethylamino group or a tert-amino group; a diarylamino group such as a diphenylamino group; a carbazolyl group; A haloalkyl group such as an orthomethyl group; a cyano group; and the like, which may be linked to each other to form a ring.
- the substituent of the ring A 1 ′′ is bonded to the substituent of the ring A 2, or the substituent of the ring A 1 ′ is bonded to the substituent of the ring A 2 ′ to form one condensed ring.
- a condensed ring may be a 7,8-benzoquinoline group or the like.
- the substituent for ring Al ", ring A1 ', ring A2 and ring A2' more preferably an alkyl group, an alkoxy group, an aromatic hydrocarbon group, a cyano group, a halogen atom, a haloalkyl group, a diarylamino group Or a carbazolyl group.
- M 7 is preferably ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum or gold, and particularly preferably a divalent metal such as platinum or palladium.
- organometallic complex represented by the general formulas (X), (Va), (Vb) and (Vc) are shown below, but are not limited to the following compounds. 18
- the ligand L and / or L in particular, 2-arylpyridine-based ligand ( A compound having 2-arylpyridine, a compound having an arbitrary substituent bonded thereto, or a compound obtained by condensing an arbitrary group with the compound is preferable.
- organometallic complex represented by the general formula (VI) are shown below, but are not limited to the following compounds.
- Examples of the host material used for the light emitting layer that emits phosphorescent light include the materials described above as the host material (including the electron transport material of the present invention) used for the light emitting layer that emits fluorescent light, and 4,4 ′.
- -N, N canolebazonole derivatives such as zikarenovazorebifuenoren (WO 00/70655), tris (8-hydroxyquinoline) aluminum (US Pat. No. 6,303,238), 2, 2 ', 2''1 (1,3,5-benzenetolinole) Tris [1-1-Heninole 1H-Benzi Midazonole] (Appl. Phys. Lett., Vol. 78, No. 1622, 2001) JP-A-2001-257076).
- the charge transporting material of the present invention can be used as a host material.
- the light emitting layer in the organic electroluminescent device of the present invention may contain the above-mentioned fluorescent dye together with the host material and the phosphorescent dopant.
- the amount of the organometallic complex contained as a dopant in the light emitting layer is preferably at least 0.1% by weight, more preferably at most 30% by weight. If it is below the lower limit, it may not be possible to contribute to the improvement of the luminous efficiency of the device. There is. It is preferable that the amount of the phosphorescent dopant in the light emitting layer that emits phosphorescence is slightly larger than the amount of the fluorescent dye (dopant) contained in the light emitting layer in a device using conventional fluorescence (singlet). There is. When a fluorescent dye is contained in the light emitting layer together with the phosphorescent dopant, the amount of the fluorescent dye is preferably 0.05% by weight or more, more preferably 0.1% by weight or more. Further, it is preferably at most 10% by weight, more preferably at most 3% by weight.
- the thickness of the light emitting layer 5 is usually at least 3 nm, preferably at least 5 nm, and usually at most 200 nm, preferably at most 100 nm.
- the light emitting layer can be formed in the same manner as the hole transport layer.
- a method of doping the above-described fluorescent dye and phosphorescent dye (phosphorescent dopant) into the host material of the light emitting layer will be described below.
- the light-emitting layer host material a doping dye, and, if necessary, additives such as a binder resin which does not act as an electron trap or a quencher of light emission, and a coating property improving agent such as a leveling agent are added.
- the dissolved coating solution is prepared, applied to the hole transport layer 4 by a method such as spin coating, and dried to form the light emitting layer 5.
- the binder resin include polycarbonate, polyarylate, and polyester. If the amount of the binder resin added is large, the hole electron mobility is decreased.
- the host material is placed in a crucible placed in a vacuum vessel, the dye to be doped is placed in another crucible, and the inside of the vacuum vessel is placed in an appropriate vacuum pump for 1.
- 0 X 1 0 _ 4 T was evacuated to about orr, evaporated by heating each of the crucibles simultaneously to form a layer on a substrate placed facing the crucible.
- a mixture of the above materials at a predetermined ratio may be evaporated using the same crucible.
- dopants are doped in the light emitting layer, they are uniformly doped in the thickness direction of the light emitting layer, but may have a concentration distribution in the film thickness direction. For example, doping may be performed only near the interface with the hole transport layer, or conversely, may be doped near the interface with the hole blocking layer.
- the light emitting layer can be formed in the same manner as the hole transport layer, but usually, a vacuum evaporation method is used.
- the light-emitting layer 5 may contain components other than those described above as long as the performance of the present invention is not impaired.
- the hole blocking layer 6 is laminated on the light emitting layer 5 so as to be in contact with the interface of the light emitting layer 5 on the cathode side.
- the hole blocking layer serves to prevent holes moving from the hole transport layer from reaching the cathode, and can efficiently transport electrons injected from the cathode toward the light emitting layer. It is preferably formed from a compound. The physical properties required of the material constituting the hole blocking layer require high electron mobility and low hole mobility.
- the hole blocking layer 6 has a function of confining holes and electrons in the light emitting layer and improving luminous efficiency.
- the hole blocking layer uses the charge transport material of the present invention.
- the charge transport material of the present invention may be used alone or in combination of two or more in the hole blocking layer. Further, a known compound having a hole blocking function may be used in combination as long as the performance of the charge transport material of the present invention is not impaired.
- the ionization potential of the hole blocking layer used in the present invention should be 0.1 eV or more larger than the ionization potential of the light-emitting layer (when the light-emitting layer contains a host material and a dopant, the ionization potential of the dopant). (Force S, more preferably 0.1 eV or more than the ionization potential of the host material).
- the ionization potential is defined as the energy required to emit an electron at the HOMO (highest occupied molecular orbital) level of a substance to a vacuum level.
- the ionization potential can be defined directly by photoelectron spectroscopy or by correcting the electrochemically measured oxidation potential against a reference electrode.
- the ionization potential is equal to the oxidation potential (Vs. SCE) +4.3 eV. (Molecular S em iconduct, ors, Springer—Verlag, 1985, p. 98).
- the electron affinity (EA) of the hole blocking layer used in the present invention is compared with the electron affinity of the light emitting layer (or the electron affinity of the host material when the light emitting layer contains a host material and a dopant). It is preferable that they are equal to or more than each other.
- Electron affinity is defined as the energy at which electrons in a vacuum level fall to the LUMO (lowest unoccupied molecular orbital) level of a substance and stabilize, based on the vacuum level, similarly to the ionization potential.
- the electron affinity is similarly obtained from the force obtained by subtracting the optical band gap from the above-mentioned ionization potential ⁇ electrochemical reduction potential by the following equation.
- Electron affinity reduction potential (V s. SCE) + 4.3 e V Therefore, the hole blocking layer used in the present invention uses the oxidation potential and the reduction potential to obtain (oxidation potential of the hole blocking material) 1 ( Oxidation potential of luminescent material) 0. IV,
- the electron affinity of the hole blocking layer is preferably equal to or less than the electron affinity of the electron transport layer.
- the thickness of the hole-blocking layer 6 is usually 0.3 or more, preferably 0.5 nm or more. Yes, it is usually 100 nm or less, preferably 50 nm or less.
- the hole blocking layer can be formed by the same method as the hole transporting layer, but usually, a vacuum evaporation method is used.
- the cathode 8 plays a role of injecting electrons into the light emitting layer 5 via the hole blocking layer 6.
- the material used for the cathode 8 can be used.
- a metal having a low work function is preferable, and tin, magnesium, indium, and calcium are used.
- a suitable metal such as aluminum, silver, or the like, or an alloy thereof is used.
- Specific examples include a low work function alloy electrode such as a magnesium-silver alloy, a magnesium alloy alloy, and an aluminum-lithium alloy. It is also, effective element for ⁇ the L i F, M g F 2 , L i 2 ⁇ such ultrathin insulating film (0. l ⁇ 5 nm) to interface between the cathode and the light-emitting layer or an electron transport layer It is an effective method for improving the rate (App 1.
- the thickness of the cathode 8 is usually the same as that of the anode 2.
- An additional layer of high work function, air-stable metal on top of this to protect the cathode made of a low work function metal increases the stability of the device.
- metals such as aluminum, silver, copper, nickel, chromium, gold and platinum are used.
- an electron transporting layer 7 may be provided between the hole blocking layer 6 and the cathode 8 for the purpose of further improving the luminous efficiency of the device.
- the electron transport layer 7 is formed of a compound capable of efficiently transporting electrons injected from the cathode between the electrodes to which an electric field is applied, in the direction of the hole blocking layer 6.
- 'Materials satisfying such conditions include metal complexes such as an anolemminium complex of 8-hydroxyquinoline (Japanese Patent Laid-Open No. 59-94393) and 10-hydroxybenzo [h] quinoline.
- Metal complex oxadiazole derivative, distyrylbiphene Derivatives, silole derivatives, 3- or 5-hydroxyflavone metal complexes, benzoxazole metal complexes, benzothiazole metal complexes, trisbenzimidazolylbenzenes (US Pat. No. 5,645,948), Quinoxaline compounds (JP-A-6-207169), phenanthroline derivatives (JP-A-5-331549), 2-t-butyl-9,10-N, N'- Disciananthraquinone dimine, n-type hydrogenated amorphous silicon carbide, n-type zinc sulfide, n-type zinc selenide and the like. .
- the above-described electron transporting material is doped with an alkali metal (Japanese Patent Application Laid-Open No. Hei 10-27071, Japanese Patent Application No. 2000-285856, Japanese Patent Application No. 0 0 — 2 856 757 etc.) is preferable because electron transportability is improved.
- the electron transport layer 7 is formed by laminating on the hole blocking layer 6 by a coating method or a vacuum evaporation method in the same manner as the hole transport layer 4. Usually, a vacuum evaporation method is used. '>
- the charge transport material of the present invention may be used for the electron transport layer 7.
- the electron transport layer 7 may be formed using only the compound of the present invention, or may be used in combination with the various known materials described above.
- the charge transport material of the present invention when used for the electron transport layer 7, the charge transport material of the present invention may be used for the above-described hole blocking layer 6, or the charge transport material of the present invention may be used only for the electron transport layer 7.
- a transport material may be used, and other known hole blocking materials may be used for the hole blocking layer 6.
- the thickness of the electron transport layer 6 is usually at least 5 nm, preferably at least 100 nm, and usually at most 200 nm, preferably at most 100 nm.
- the electron transport layer 7 is formed by laminating on the hole blocking layer 6 by a coating method or a vacuum evaporation method in the same manner as the hole transport layer 4. Usually, a vacuum evaporation method is used.
- An anode buffer layer 3 may be inserted between the hole transport layer 4 and the anode 2 for the purpose of further improving the efficiency of hole injection and improving the adhesion of the entire organic layer to the anode. (See Figure 3).
- the initial device At the same time as the drive voltage decreases, the voltage rise when the device is continuously driven with a constant current is suppressed.
- the conditions required for the material used for the anode buffer layer are that it has good contact with the anode, can form a uniform thin film, and is thermally stable, that is, has a high melting point and glass transition temperature, and a melting point of 300 ° C.
- the glass transition temperature is preferably 100 ° C or higher.
- the ionization potential is low, holes can be easily injected from the anode, and the hole mobility is high.
- porphyrin derivatives phthalocyanine compounds (JP-A-63-295695), hydrazone compounds, alkoxy-substituted aromatic diamine derivatives, ⁇ - (9 Anthryl) - ⁇ , ⁇ , '-di-p-tolylaniline, polycfflelenvinylene, poly-p-phenylenevinylene, polyaniline (Appl. Phys. Lett., 64, 1245, 1994), polythiophene (Optical Materials, Vol. 9, p.
- organic compounds such as starburst type aromatic triamine (Japanese Patent Application Laid-Open No. 4-308688), and sputtered carbon films (Synth. Met., Vol. 91, p. 73).
- metal oxides such as vanadium oxide, ruthenium oxide, and molybdenum oxide (J. Phys. D, vol. 29, p. 2750, 1996).
- a layer containing a low-molecular-weight organic compound capable of injecting and transporting holes and a compound containing an electron-accepting compound (described in JP-A-11-1251067, JP-A-2000-159221, etc.), A layer obtained by doping a non-conjugated polymer compound containing a group or the like with an electron-accepting compound as necessary (Japanese Patent Application Laid-Open Nos. 11-135262, 11-283750, 2000 — 36390, JP 2000-150168, JP 2001-223084, WO 97/33193, etc.) or a layer containing a conductive polymer such as polythiophene (Japanese Patent Laid-Open No. 10-92584). And the like, but are not limited to these.
- the material of the anode buffer layer it is possible to use any compound of low molecular weight and high molecular weight.
- porphine compounds or phthalocyanine compounds are often used. These compounds may have a central metal. And it can be non-metallic. Preferred examples of these compounds include the following compounds:
- Titanium lid mouth cyanine oxide ''
- a thin film can be formed in the same manner as the hole transport layer.
- a sputtering method, an electron beam evaporation method, and a plasma CVD method are used.
- the lower limit is usually about 3 nm, preferably about 10 nm, and the upper limit is usually about 100 nm. nm, preferably about 50 nm.
- the polymer compound and the electron-accepting compound and, if necessary, additives such as a coating resin improving agent such as a binder resin and a leveling agent which do not trap holes are added and dissolved.
- a coating solution is prepared, coated on the anode 2 by a usual coating method such as a spraying method, a printing method, a spin coating method, a dip coating method, a die coating method, or an ink jet method, and dried to dry.
- the pole buffer layer 3 can be formed as a thin film. Poly power as binder resin -Ponate, polyarylate, polyester and the like. If the content of the binder resin in the layer is large, the hole mobility may be lowered. Therefore, it is preferable that the content of the binder resin is small, and the content in the anode buffer layer 3 is preferably 50% by weight or less.
- a thin film may be formed in advance on a medium such as a film, a support substrate, or a roll by the thin film forming method described above, and the thin film on the medium may be thermally or pressure-transferred onto the anode 2. it can.
- the lower limit of the film thickness of the anode buffer layer 3 formed using the polymer compound is usually 5 nm, preferably about 10 nm, and the upper limit is usually 100 nm, preferably Is about 500 nm.
- the organic electroluminescent device of the present invention can have a structure reverse to that of FIG. 1, that is, a cathode 8, a hole blocking layer 6, a light emitting layer 5, a hole transport layer 4, and an anode 2 stacked on a substrate in this order.
- a cathode 8 a hole blocking layer 6, a light emitting layer 5, a hole transport layer 4, and an anode 2 stacked on a substrate in this order.
- the organic electroluminescent element of the present invention between two substrates, at least one of which has high transparency.
- the layers can be stacked in the reverse order of the above-described respective layer configurations shown in FIG. 2 or FIG.
- any of the layer configurations shown in FIGS. 1 to 3 may have any layer other than those described above without departing from the spirit of the present invention. It is possible to make an appropriate modification such as simplifying the layer configuration by providing the layer.
- the top emission structure and the cathode / anode can be made transmissive by using transparent electrodes.
- a structure in which the layers shown in FIG. 1 are stacked in multiple stages a structure in which a plurality of light emitting units are stacked
- the interface layer between stages between emission Interview knit) (anode ITO, the second layer when the cathode is A 1) in place of, for example, V 2 0 5 and the like as a charge generating layer (CGL)
- the barrier between steps is reduced, which is more preferable from the viewpoint of luminous efficiency and driving voltage.
- the present invention can be applied to any one of an organic electroluminescent element, a single element, an element having a structure arranged in an array, and a structure in which an anode and a cathode are arranged in an XY matrix. it can.
- the organic electroluminescent device of the present invention by including a compound having a specific skeleton as a charge transport material, high luminous efficiency, good color purity, and driving stability are obtained. In this case, a greatly improved device can be obtained.
- blue (fluorescent) light-emitting devices and phosphorescent light-emitting devices for which it has been difficult to form a hole-blocking layer because of the difficulty in selecting materials, have been developed to have excellent light-emitting efficiency, emission color purity, and driving stability. As a result, excellent performance can be achieved when applied to full-color or multi-color panels.
- R u , R 13 , R 15 and R 18 each independently represent a hydrogen atom or an arbitrary substituent.
- R 12 , R 14 , R 16 and R 17 each independently represent an arbitrary substituent.
- Z tl represents a divalent linking group having a direct bond or a ring A t is conjugate an electronic.
- Z 12 represents a direct bond or a divalent linking group having an electron which can be conjugated to a ring.
- Q 01 is a (p + k) -valent aromatic hydrocarbon group that makes any two selected from the group consisting of ring A 1 and ring contained in one molecule substantially non-conjugateable. Alternatively, it represents a heterocyclic group.
- p is an integer of 0-8.
- k is an integer from 0 to 8.
- p and k are integer from 2 to 8. If p and Z or k are 2 or more,
- a plurality of R U to R 18 contained in one molecule may be the same or different,
- a plurality of z u and z 12 in one molecule may be each independently selected from the same.
- the molecular weight of the compound represented by the general formula (II) is usually 4000 or less, preferably 3000 or less, more preferably 2000 or less, and is usually 200 or more, preferably 300 or more, more preferably 400 or more. . .
- the molecular weight exceeds the upper limit, the sublimation property is significantly reduced, which may hinder the use of the vapor deposition method when manufacturing an electroluminescent device, may cause a decrease in solubility in an organic solvent, or may cause a problem. Purification of a material (that is, removal of a substance causing deterioration) may become difficult with an increase in impurity components generated in the process. If the molecular weight is below the lower limit, the glass transition temperature, the melting point, the vaporization temperature, etc. decrease, so that the heat resistance may be significantly impaired. '
- the melting point of the compound represented by the above general formula (II) is usually at least 100 ° C, preferably at least 120 ° C, usually at most 600 ° C, preferably at most 500 ° C. Exceeding the upper limit is not preferred because sublimability and solubility may be reduced, and lowering the lower limit may undesirably lower the heat resistance of the device.
- the glass transition point of the compound represented by the above general formula (II) is usually 50 ° C or higher, preferably 60 ° C or higher. If the value is below the lower limit, the heat resistance of the element may be reduced, which is not preferable.
- the oxidation potential of the compound represented by the above general formula (II) is usually +1.3 V or more, preferably +1.5 or more, usually +2.5 V or less, preferably +2.0 V or less. .
- Exceeding the upper limit is not preferred because the driving voltage of the device may be increased, and lowering the lower limit is not preferred because the hole blocking property may be reduced and the luminous efficiency may be reduced.
- the reversibility in the electrode oxidation reaction is not particularly required, and may be irreversible or reversible.However, when applied to the use of transporting a positive charge, the reversibility standard described in the present invention must be satisfied. Is desirable.
- the reduction potential of the compound represented by the general formula (II) is usually from 1.1 to 1.6 V, preferably from -1.8 to 2.4 V. Exceeding the upper limit is not preferable because the electron transportability is reduced, and lowering the lower limit is not preferred because it may hinder the transfer of electrons to the luminescent material (phosphorescent dye).
- the reversibility in the electrode reduction reaction is an important factor, and it is important that the reversibility criteria described in the present invention be satisfied.
- Z u may be a direct bond or a divalent linking group having an electron capable of conjugation with the ring
- Z 12 may be a direct bond or a divalent linking group having an electron capable of conjugating with the ring.
- the ring A 1 and the ring have the property of partially accepting a charge that tends to be localized, or having a property of appropriately delocalizing the charge in the molecule by transferring the charge to another substituent. preferable.
- Z u and Z 12 are the same as the those described in the description of (Z l Z 2) '.
- the Z u and Z 12 are used in the compounds of the present invention, a direct bond or be a substituent which is closed by may divalent aromatic hydrocarbon group, high triplet excitation level ⁇ beauty redox potential In particular, Z-1 (direct bond) is preferred.
- the molecular weight of Z u and Z 12, the substituent including, preferably 400 or less, more preferably 250 or less.
- Q 01 is a (p + k) -valent linking group that makes any two selected from the group consisting of ring At and ring ⁇ contained in one molecule substantially non-conjugateable.
- those having a property of accepting a part of the charge which tends to be localized on the ring and the ring and reducing the charge separation are preferable.
- Specific examples are the same as those described in the description of (Q.) above.
- the Q 01 used in the compound of the present invention, Q-1, 35 is preferred.
- substituents that may have power are also Q. Is the same as the substituent which may have It is like.
- the molecular weight of Q 01 is preferably 400 or less, more preferably 250 or less.
- R u, R 13, R 15 and R 18 each independently represent a hydrogen atom or any substituent
- R 12, R l4, R 16 and R 17 each independently represent any substituent .
- Ru ⁇ R 18 also is similar to that described in (1 ⁇ to 1 ⁇ ), and preferred examples are also the same.
- the molecular weight of each of R U to R 18 is preferably 400 or less, more preferably 250 or less.
- R 12 , R 14 , R 16 and R 17 are substituted.
- An aromatic hydrocarbon group or an aromatic heterocyclic group which may have a group is preferable from the viewpoint of improving the oxidation-reduction durability and improving the heat resistance.
- the film when the film is an aggregate of molecules, it is possible to suppress the phenomenon that the absorption maximum wavelength and the fluorescence emission maximum wavelength increase as compared with the solution state (the state in which the molecules are scattered). . Further, it is possible to suppress the phenomenon that the triplet excitation level is reduced and the phenomenon that the electric oxidation-reduction potential difference is reduced. 'Therefore, it is a compound that can store large energy (light, electricity, heat, etc.) and efficiently release the stored energy (as light, electricity, heat, etc.).
- the compounds are used not only for electron transport materials, but also for light-emitting materials, solar cell materials, battery materials (electrolytes, electrodes, separation membranes, stabilizers, etc.), medical materials, paint materials, coating materials It is also useful for organic semiconductor materials, toiletry materials, antistatic materials, and thermoelectric element materials.
- the following describes a compound food that does not have a planar structure when the compound has the most stabilized structure, that is, a structure that cannot have a substantially single planar structure when the compound has the most stabilized structure.
- a compound in which any two adjacent aromatic rings constituting a molecule are non-planar at the same level as 2-methylbiphenyl is a compound that does not have a planar structure.
- the plane angle between any two adjacent aromatic rings constituting a molecule is strictly 15 degrees or more, more strictly 20 degrees or more, more strictly 30 degrees or more. It can be said that anything higher than a degree does not have a planar structure.
- Ar 2 an arbitrary aromatic ring (referred to as Ar 2) bonded to at least one aromatic ring (referred to as Ar 1) in the molecule and an optional substituent (referred to as R r) of Ar 1 are It is desirable that substitution be made at adjacent substitution positions. However, R r may be bonded to Ar l or another substituent to form a ring.
- Such examples include the following:
- the plurality of skeletons be substantially coplanar with the linking group from the viewpoint of not impairing excellent electrical oxidation reduction durability and excellent charge transportability.
- Examples of such a ring and a ring which are substantially on the same plane as the linking group 001 include the following. ⁇
- R 31 , R 33 to R 35 are any aromatic ring groups, and R 32 is a hydrogen atom or any substituent.
- Preferred Z U and Z 12 at this time are as described below.
- Preferred examples 2 For example, in the compound represented by the formula (II), any ring AL (or ring BJ, ring (or a linking group Z U (or Z 12 linked with the ring BJ) and Z or linked not on group Q 01 substantially the same plane, the viewpoint of a wide electric redox potential, preferred from the viewpoint of high triplet excitation level.
- Such a ring (or ring B or ring B or a linking group Z U (or Z 12 ) linked to the ring (or ring B) and not substantially coplanar with Z or the linking group) The following are listed.
- R 41 , R 43 , R 45 and R 46 are any aromatic ring groups, and R 42 , R 44 , R 47 and R 48 are hydrogen atoms or any substituents).
- Preferred Z U and Z 12 at this time are as described below.
- Z U and Z 12 the above Z- 1 (direct bond) Z- 3, 1 2, 1 6, 1 9, 2 0 ⁇ 3 0, 37 to 39, 41, 42, 45, 46, 48, 49, 52, 53, 58 to 60 are preferred,
- Z-1 (direct bond) Z-3,12,16,19,20,21 is more preferable
- Z ⁇ l (direct bond) Z-3 is more preferable
- Z-1 (direct bond) is most preferred.
- ⁇ 60 is preferred
- Z-1 direct connection
- Z-2 3, 4, 5, 8, 10, 12, 15, 16, 17, 19, 28, 29, 31, 33, 34, 52, 56 to 58 are more preferable
- Z-1 direct bonding
- Z-2 5, 8, 12, 19, 28, 29 are more preferable
- Z-1 Direct bonding
- they are Q-1, 23, 29, 34, 35, 45, 58 to 61, and more preferably, Q-1, 23, 29, 35, 45, 58, 61, more preferably Q—1, 35, 45,
- they are Q-1,2,19-23,35-42,45, and most preferably Q-1,2,23,35. .
- the fact that the compound has a planar structure may be considered to be the opposite, although the description has been made on the case where the compound does not have the planar structure.
- a molecule in which any two adjacent aromatic rings constituting a molecule have the same degree of planarity as biphenyl is said to have a planar structure.
- the pyridine ring has excellent amorphous properties by breaking the symmetry, and has excellent solubility in organic solvents and the like. Therefore, it exhibits stable film-forming properties without crystallization when the film is formed.
- R 15 to R 18 have the same meaning as in the above general formula (II). Ring C ′ may have a substituent. In the general formula (III), two R 15 to R 18 may be the same or different.
- the molecular weight of the compound represented by the above general formula (III) is usually 200 or more, preferably 400 or more, usually 4000 or less, and preferably 1,000 or less. If the molecular weight is too large, the purification operation will be reduced. If the molecular weight is lower than the lower limit, stable film formation will be obtained due to factors such as a lower glass transition temperature, a lower vaporization temperature, and higher crystallinity. And the durability may be insufficient.
- the glass transition temperature (Tg) of the compound represented by the above general formula (II) is preferably 70 ° C or higher, more preferably 100 ° C or higher.
- the oxidation potential electrochemically measured with respect to the reference electrode is usually 1.3 VvsSCE or more, the reduction potential is in the range of -1.7 VvsSCE or less, and the oxidation potential is The reduction potential is preferably not less than 1.5 V vs SCE and the reduction potential is not more than -1.9 V 'vs SCE, and particularly preferably the oxidation potential is not less than 1.7 V vs SCE and the reduction potential is not more than 2,0 V vs SCE.
- the compound has a structure in which non-covalent electron pairs on the nitrogen atom of the pyridine ring cannot be directly conjugated, and a conjugated structure is formed between the 1,3,5-substituted phenylene group and the pyridine ring. Therefore, it has a large redox potential difference and is particularly excellent in reversibility.
- the electron transporting property and heat resistance are further improved.
- it since it has excellent amorphous properties and excellent solubility in organic solvents, it exhibits stable film-forming properties without crystallization when a film is formed, and has a high glass transition temperature (Tg). It has excellent heat resistance and durability. .
- R 23 and R 24 each independently represent an arbitrary substituent.
- Ring E t to ring E 3 may have a substituent in addition to R 23 and R 24 .
- a plurality of R 23 and R 24 may be the same or different.
- Ring D may have a substituent.
- R 23 ⁇ Pi R 24, the same ones as exemplified as (R i ⁇ R 8) can be applied.
- R 23 and R 24 may have a substituent, and examples of the substituent include those exemplified as the substituent (1 (to R 8 ).
- R 23 and R 24 are preferably an aromatic hydrocarbon group which may have a substituent, from the viewpoint of improving the electrical oxidation-reduction durability and increasing the oxidation-reduction potential difference. '
- a furyl group which may have a substituent (in the case where a substituent is present, an alkyl group such as a methyl group, a phenyl group, a tolyl group, a substituted aryl group such as a mesityl group is preferred ).
- a hydrogen atom, an alkyl group, or an aryl group is preferred from the viewpoint of limiting molecular vibration and not impairing luminous efficiency, and more preferably a phenyl group which may have a hydrogen atom or a substituent (here, When it has a substituent, it is preferably a substituted aryl group such as an alkyl group such as a methyl group, a phenyl group, a trinole group, and a mesityl group.
- R 23 and R 24 are the same as the R u R.
- the molecular weight of the compound represented by the above general formula (IV) is usually at least 300, preferably at least 400, usually at most 400, preferably at most 150. If the molecular weight exceeds the upper limit, purification operation will be reduced. If the molecular weight is below the lower limit, stable film formation will occur due to factors such as a lower glass transition temperature, vaporization temperature, and higher crystallinity. The durability may not be obtained and the durability may be insufficient.
- the glass transition temperature (Tg) of the compound represented by the above general formula (IV) is preferably at least 90 ° C, more preferably at least 100 ° C.
- the oxidation potential electrochemically measured with respect to the reference electrode is 1.3 VvsSCE or more, the reduction potential is 1.7 VvsSCE or less, and the oxidation potential is 1
- the reduction potential is preferably 5 V vs SCE or more and the reduction potential is less than or equal to 1.9 V vs SCE, particularly preferably the oxidation potential is greater than or equal to 1.7 V vs SCE and the reduction potential is less than 2.0 V vs SCE.
- the method for synthesizing the compound of the present invention is as described above.
- the compounds of the present invention are useful as charge transport materials. Further, since the compound of the present invention has essentially excellent oxidation-reduction stability, it can be usefully applied to not only organic electroluminescent devices but also electrophotographic photoreceptors.
- the compound of the present invention is excellent in amorphousness, solubility, heat resistance and durability, in addition to the high performance of the charge transport material of the present invention. Therefore, not only for charge transport materials, but also for luminescent materials, solar cell materials, battery materials (electrolytes, electrodes, separation membranes, stabilizers, etc.), medical materials, paint materials, coating materials, organic materials It is also useful for semiconductor materials, toiletry materials, antistatic materials, and thermoelectric element materials. Examples>
- Synthesis examples of the compound of the present invention and the compound that can be used as the charge transport material of the present invention are shown below in Synthesis Examples 1 to 26.
- the glass transition temperature was determined by DSC measurement
- the vaporization temperature was determined by Tg-DTA measurement
- the melting point was determined by DSC measurement or Tg-DTA measurement.
- This compound had a glass transition temperature of 79 ° C, a melting point of 205 ° C, and a vaporization temperature of 414 ° C.
- This compound had a melting point of 384 ° C, a vaporization temperature of 523 ° C, and a glass transition temperature T g of 225 ° C.
- the target substance 12 (1.4 g), 1-phenacinolepiridinium bromide 2.5 g), ammonium acetate (11.6 g), acetic acid (46 m 1), N, N-Dimethylformamide (46 ml) was stirred under reflux with heating for 8 hours, and water (5 ⁇ ) and methanol (50 ml) were added to the obtained solution and stirred.
- the deposited precipitate was filtered, washed with water, and then suspended and washed in methanol (80 ml). Further, after recrystallization from methanol and methanol, a part thereof was purified by GPC to obtain 13.1 (0.1 g) of the desired product.
- target substance 14 (12.2 g), 1-phenacylpyridinium bromide (29.9 g), ammonium acetate (166 g), acetic acid (280 ml), N, N — Dimethylformamide (25 Om 1) and benzene (7 Oml) were stirred for 10.5 hours while heating under reflux, and the resulting solution was added with water (20 OmI) and ethanol (100 ml). Was added and stirred. The precipitated precipitate is filtered and washed with ethanol. The precipitate is washed by suspension in ethanol (500 ml) for 2 hours, and heated in chloroform (200 ml) -toluene (250 ml).
- Target 16 (10 g), 1-phenacylpyridinium bromide (16.8 g), ammonium acetate (77.8 g), acetic acid (280 ml), N, N-dimethylformamide (430 ml) was stirred under reflux for 8 hours, and the resulting solution was poured into water (300 ml) and ethanol (80 ml), and the deposited precipitate was filtered and washed with methanol (300 ml). Thereafter, the residue was dissolved in methylene chloride (50 ml), and methanol (250 mU) was reprecipitated to obtain the desired product 17 (11.34 g).
- the target compound 17 (5 g), phenylphosphonic acid (2.25 g), potassium carbonate (3.97 g), ethylene glycolic acid methyl alcohol (70 ml), water (23 ml) Heat to 80 ° C under a nitrogen stream. Tetrakis (triphenylphosphine) c.
- Target substance 22 In a nitrogen stream, Target substance 21 (10. Og), 1-phenacylpyridinium bromide (16.9 g), ammonium acetate (77.8 g), acetic acid (23 Om 1), N, N
- Target substance 23 In a nitrogen stream, Target substance 22 (10.5 g), fluorporonic acid (5.5 g), tetrax (triphenylphosphine) palladium (1.4 g), phosphoric acid A mixture of 12.8 g of water (12.8 g), toluene (200 ml) and ion-exchanged water (30 ml) was stirred for 5.5 hours under heating and reflux, and then toluene (50 ml) and water (120 ml) were stirred. ) was added and mixed well. The organic layer alone was separated, washed with water (100 m), dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated and purified by silica gel column chromatography to obtain the desired product 23 (2.9 g). DE I
- the target compound 1 of Example 1 (3. Og), the target compound 24 obtained from the above (9.45 g), ammonium acetate (34.2 g), acetic acid (1 277 m 1), Ethanol (80 ml) was added to a solution obtained by stirring N, N-dimethylformamide (100 ml) under reflux with heating for 7 hours, followed by stirring, and then water (160 ml). )), And the resulting precipitate was filtered and the resulting crystals were washed with ethanol (150 ml) under reflux. Furthermore, recrystallization was performed with toluene (5 Om1) and methanol (2 Om1), and the obtained crystal was further recrystallized with chloroform (4 Om1) and methanol (20 ml). The desired product 25 (1.5 g) was obtained.
- Object 26 Object 27 Object 28 In a nitrogen stream, under ice-cooling, in a mixed solution of lithium aluminum hydride in tetrahydrofuran (1 mo 1 ZL) 10 Om1 and 100 m1 of tetrahydrofuran (dehydrated) , a solution of a trimethinecyanine chic acid 5. 8 g to as tetrahydrofuran (dehydrated) 1 0 O m 1, while stirring, was added dropwise over 1 7 minute, 27 minutes at room temperature, under heating reflux for 20 For 3.5 minutes at room temperature.
- Target substance 29 In air, target substance 28 (0.47 g), 1-phenacylpyridinium bromide (1.26 g), ammonium acetate (7.1 g), acetic acid (25 m 1) and N, N-dimethinoleformamide (25 ml) were stirred for 6.5 hours while heating under reflux. Methanol and water were added to the obtained mixture to precipitate a precipitate, which was filtered, the filtrate was concentrated, and the obtained residue was purified by silica gel column chromatography to obtain the desired product 29 (0.17 g) Got.
- the melting point was 344 ° C, the glass transition temperature was 299 ° C, and the vaporization temperature was 524 ° C.
- target substance 32 (1.8 1 g), 1-phenacylpyridinium bromide (3.00 g), ammonium acetate (14.0 g), acetic acid (62 ml), N , N-Dimethylformamide (62 ml) was stirred for 5 hours while heating under reflux, then methanol (20 ml) and water (100 ml) were added, and the deposited precipitate was filtered and washed with methanol. The obtained solid was purified by silica gel column chromatography to obtain the desired product 33 (0.26 g).
- target compound 5 (0.70 g), target compound 24 (2.39 g), ammonium acetate (8.78 g), acetic acid (43 ml), N, N-dimethylformamide (43 ml) ) was stirred under reflux with heating for 10 hours, and methanol (20 ml) was added to the resulting solution, followed by stirring. The deposited precipitate was filtered, washed with methanol, and purified by silica gel column chromatography to obtain the desired product 34 (0.52 g).
- Target compound 35 (9.92 g), 1-phenacylpyridinium bromide (16.7 ammonium acetate (78 g), acetic acid (35 Om 1), N, N-dimethylform
- the amide 350 ml was stirred under reflux with heating for 7.5 hours, then poured into water (700 ml), and the deposited precipitate was filtered, purified by washing with methanol, and purified to obtain the desired compound 36 ( 1 1.3 g) was obtained.
- Concentrated sulfuric acid (1.6 ml) was added to a mixed solution of the target compound 4 1 (1.80 g), acetofenone (l., 25 g), and acetic acid (20 ml) in dry air. 9.After stirring for 5 hours, methanol (10 ml) and water (40 ml) were added, and the solid obtained by distilling off the supernatant by decantation was purified by recrystallization from chloroform-methanol. The desired product 42 (1.78 g) was obtained.
- Target compound 42 (1.78 g), 1-phenacylpyridinium bromide (2.62 gk ammonium acetate (12.1 g), acetic acid (75 ml), N, N-dimethylform Muamide (75 ml) was stirred for 8.5 hours while heating and refluxing while publishing dry air, and then 50 ml of methanol and 50 ml of water were added, and the precipitated precipitate was filtered off, and a silica gel column was used. The residue was purified by chromatography and recrystallization from form-methanol to give the desired product 43 (0.87 g).
- the gas transition temperature was 111 ° C, the melting point was 266 ° C, and the vaporization temperature was 528 ° C.
- Target 44 to Target 46 In a stream of nitrogen, a mixture of the target substance 31 (4.01 g), 3-force lipoxyphenylporonic acid (3.90 g), and dimethoxetane (100 ml) was added to tetrakis (triphenylphosphine) palladium (0. 92 g) and a 2M aqueous carbon dioxide solution (20 ml) were sequentially added thereto, and the mixture was stirred for 7.5 hours under reflux with heating. The solid obtained by distilling off the supernatant liquid by decantation was purified by silica gel column chromatography to obtain the desired product 44 (3.70 g).
- 1,3,5-Tribromobenzene 1 After cooling 1.6 g of dehydrated ethynoleate solution (24 OmL) to 1 78 ° C under a nitrogen atmosphere, a 1.6 M hexane solution of n-butyllithium was added. 23 mL was added dropwise. The mixture was stirred at 78 ° C. for 1 hour, and then 2.9 mL of dimethylformamide was added with care not to raise the temperature, and the mixture was stirred for 1 hour. Furthermore, slowly add 25 mL of 1.6 M hexane solution of n-butyllithium, stir for 1 hour, add 9.1 mL of dimethylformamide, and stir at _ 78 ° C for another 2 hours did.
- Object 47 Object 48 3.3 g of acetophenone and 3.5 mL of sulfuric acid were added to a 3 OmL solution of the target compound 47 (2.4 g) in acetic acid, and the mixture was stirred at 40 ° C in the air for 9.5 h. Thereafter, 100 mL of water and 3 OmL of methanol were added to the reaction system, stirred, and then filtered. The obtained crude product was washed with methanol to obtain 4.5 g of an ocher solid. The mass measurement result of the obtained compound confirmed that it was the target compound 48.
- the desired product 49 (468 mg), 9-phenanthryl poronic acid (444 mg), 2 OmL of toluene and 1.5 mL of ethanol 1.5 mL of 2N aqueous sodium carbonate solution were added, and the mixture was stirred at room temperature under nitrogen for 30 minutes. Then, 40 tng of tetrakistriphenylphosphine palladium (0) was added, and the mixture was heated under reflux for another 7 hours. Thereafter, 5 OmL of water was added to the reaction solution, and extraction was performed several times with methylene chloride. After adding potassium carbonate to the extract and drying, the solution was distilled off under reduced pressure. The resulting precipitate was purified by column chromatography to obtain a yellow-white solid (462 mg).
- the mass measurement result of the obtained compound confirmed that the target compound was 50.
- Target substance 51 Target substance 52 Target substance 51
- a solution (25 mL) of 1 (3.04 g ) in dehydrated tetrahydrofuran to _78 ° C in a nitrogen atmosphere a 1.6 M hexane solution of n-butyllithium 13. 8 mL was slowly added dropwise, and the mixture was stirred at 178 ° C for 45 minutes. Thereafter, triisopropoxy porane (4.1 g) was added all at once, and the mixture was stirred at 178 ° C for 30 minutes, then the reaction solution was heated to room temperature, and further stirred for 1 hour.
- 3 O hydrochloric acid (10 OmL) was added, and extraction was performed with getileruthere (20 OmL).
- the organic layer was washed with 5 OmL of water, treated with sodium sulfate, and the solvent was distilled off.
- the resulting crude product was reprecipitated by adding geethylether to obtain 1.97 g of a white solid (the target product 52).
- the desired product 36 (3.0 g), canolebazonole (1.73 g), t-butoxy sodium (1.8 g), and toluene (80 ml) were heated to 60 ° C and stirred, and tris (dibenziene) was added.
- Tris (dibenzylidene) was obtained by heating the target compound 17 (3.0 g), sodium hydroxide (1.73 g), sodium t-butoxide (1.8 g), and toluene (80 ml) to 60 ° C and stirring. Acetone) A solution in which dipalladium (0.16 g) and tri-t-butylphosphine (0.2 g) were dissolved in 5 ml of toluene was added.
- the oxidation-reduction potential of the target product 2 (HB-1), the target product 6 (HB-.3) and the target product 15 (HB-5) obtained in the above synthesis examples was measured.
- the measurement conditions are as follows.
- the obtained potential was converted using the saturated sweet copper electrode (SCE) as a reference electrode, and the result is shown in Table 1-1.
- Reference electrode Silver wire (uses fuguchi as internal standard substance)
- Measurement solvent 0.1 lm l / L tetra (normal butyl) ammonium chloride methylene chloride solution (acetonitrile solution)
- Example 1-1 In the same manner as in Example 1-1, as a comparative compound, the oxidation-reduction potential of the following structural compound (HB-6) in which nitrogen atoms of a pyridine ring were conjugated to each other was measured. The results are shown in Table 1-1.
- Table 11 shows that the compound of the present invention has a non-conjugated structure, so that the oxidation-reduction potential difference is larger than that of the conjugated structure (comparative). . .
- Object 18 and a compound which corresponds to the compound of the general formula (II) of the present invention and which does not have a planar structure when the compound assumes the most stabilized structure hereinafter, referred to as compound II.
- a thin film (film thickness 50 nm) of the target substance 15 was formed on a glass substrate by a vacuum evaporation method.
- the obtained thin film was a transparent amorphous film.
- Tables 11 and 12 show the maximum emission peak wavelengths in the fluorescence emission spectrum of the obtained thin film when excited at the maximum absorption wavelength.
- a thin film of the target compound 6 and the target compound 25 (HB-8), which corresponds to the compound of the general formula (II) of the present invention and is not a compound that does not have a planar structure when the compound has the most stabilized structure. was prepared in the same manner as in (Example 1-2).
- the obtained thin film was a transparent amorphous film.
- the maximum emission peak wavelength in the fluorescence spectrum of the obtained thin film when excited at the maximum absorption wavelength is shown in Table 1-12. Table 1 1-2
- An organic electroluminescent device having the structure shown in FIG. 3 was manufactured by the following method.
- a transparent conductive film 2 of indium tin oxide (ITO) 150 nm deposited on a glass substrate 1 was subjected to ordinary photolithography and hydrochloric acid etching.
- a 2 mm wide stripe was used to pattern the anode to form an anode.
- the patterned ITO substrate was cleaned in the following order: ultrasonic cleaning with acetone, water cleaning with pure water, ultrasonic cleaning with isopropyl alcohol, dried with nitrogen blow, and finally cleaned with ultraviolet rays.
- the substrate on which one layer of the anode buffer was formed was placed in a vacuum evaporation apparatus.
- the degree of vacuum inside the equipment is 1.1 ⁇ 1 ( ⁇ 6 ⁇ ⁇ rr is evacuated with the (about 1. 5 X 10- 4 P a) an oil diffusion pump until below.
- the following compounds were placed in separate ceramic crucibles, with the following main component (host material) of the light-emitting layer 5: a levazole derivative- (E-1) shown below and an organic iridium complex (D-1) as a subcomponent (dopant).
- a film was formed by a binary simultaneous evaporation method.
- the crucible temperature of compound (E-1) is controlled at 184 to 196 ° C, the deposition rate is controlled at 0.1 ll nm Z seconds, and the crucible temperature of compound (D-1) is controlled at 245 to 246 ° C.
- a light-emitting layer 5 having a thickness of 30 nm and containing 6% by weight of the compound (D-1) was laminated on the hole transport layer 4.
- the degree of vacuum during deposition was 1. 0 X 10- 6 To rr (about 1. 3 X 10 one 4 P a).
- the hole blocking layer 6 the target substance 2 (HB-1) synthesized in Synthesis Example 1 above
- the crucible temperature was set at 190 to 196 ° C, and the layers were laminated at a deposition rate of 0.13 nm / sec to a film thickness of 10 nm.
- the degree of vacuum during deposition was 0. 7 X 10_ 6 T orr (about 0. 9 X 1 0- 4 P a ).
- an electron-transporting layer 7 As shown below, aluminum 8-hydroxyquinoline complex (ET-1)
- the crucible temperature of the aluminum 8-hydroxyquinoline complex was controlled in the range of 250 to 262 ° C, and the degree of vacuum during evaporation was 0.7 X 10 — 6 Torr (about 0.9 X 10 — 4 Pa), deposition rate is 0.2 1 It was 35 nm.
- the substrate temperature during vacuum deposition of the above-described hole transport layer, light emitting layer and electron transport layer was kept at room temperature.
- the element on which the electron transport layer 6 was deposited was once taken out of the vacuum deposition apparatus into the atmosphere, and a 2 mm-wide striped shadow mask was used as a cathode deposition mask.
- the stripes are closely attached to the element so as to be perpendicular to the stripes, and placed in a separate vacuum deposition apparatus, and the degree of vacuum in the apparatus is set to 2.7 X 10 " 6 Torr (about 2.0 X 1 0- 4 P a) and evacuated to below.. as a cathode 8, first, lithium fluoride (L i F) using a molybdenum boat, deposition rate 0. 0 I NMZ seconds, the vacuum degree of 3. in 0 X 10 "6 T orr (about 4.
- Table 12 shows the emission characteristics of this device. .
- the maximum emission luminance indicates a value at a current density of 0.25 A / cm 2
- the luminous efficiency-luminance / current / voltage indicates a value at a luminance of 100 cdZm 2 .
- the maximum wavelength of the emission spectrum of device 1 was 510 nm, and it was identified as being derived from an organic iridium complex (D_1).
- Table 2 shows emission characteristics of the element 2.
- Table 2 shows emission characteristics of the element 3.
- Example 2-1 Example 2-1 except that the target substance 6 (HB-3) obtained in Synthesis Example 3 shown below was used instead of the target substance 2 (HB-1) of the hole blocking layer.
- Element 4 was produced in the same manner as described above.
- Table 2 shows emission characteristics of the device 4.
- the light emission characteristics in the early stage were higher than those of the device 1.
- Example 2-1 except that instead of target 2 (HB-1) of the hole blocking layer, target 10 (HB-4) obtained in Synthesis Example 5 shown below was used. Element 5 was produced in the same manner as described above.
- Table 12 shows emission characteristics of the element 5.
- the initial light emission characteristics were almost equal to those of the element 1.
- Example 2-1 except that the target substance 15 (HB-5) obtained in Synthesis Example 7 shown below was used instead of the target substance 2 (HB-1) of the hole blocking layer.
- Element 6 was produced in the same manner as in (6).
- Table 12 shows the emission characteristics of Element 6.
- the initial light emission characteristics were higher in efficiency than the device 1.
- Example 2-1 Example 2-1 except that the target substance 18 (HB-6) obtained in Synthesis Example 8 shown below was used instead of the target substance 2 (HB-1) of the hole blocking layer. In the same manner as in the above, Device 7 was produced.
- Table 12 shows emission characteristics of the device 7.
- the initial light emission characteristics were higher in efficiency than the device 1.
- Device 8 was fabricated in the same manner as in Example 2-1 except that target 25 (HB-8) shown below was used instead of target 2 (HB-1) of the hole blocking layer. did.
- Table 12 shows emission characteristics of the element 8.
- Example 2-1 except that instead of the target substance 2 (HB-1) of the hole blocking layer, the target substance 4 (HB-9) obtained in Synthesis Example 2 shown below was used. Element 11 was produced in the same manner as described above.
- Table 12 shows emission characteristics of the element 11.
- a device was prepared in the same manner as in (Example 2-1) except that the target substance 50 (obtained in Synthesis Example 19) shown below was used instead of the target substance 2 (HB-1) of the hole blocking layer. 12 were produced.
- Table 12 shows emission characteristics of the element 12.
- the light emission characteristics in the early stage were higher than those of the device 1.
- a material composed of a non-conjugated polymer compound having an aromatic amino group (PB-1) and an electron-accepting compound (A-2) having an aromatic amino group represented by the following formula is used as the material of the anode buffer layer 3.
- a device 13 was produced in the same manner as in (Example 2-1), except that the thicknesses of the layers (the layers from the hole transport layer 4 to the electron transport layer 7) were changed as described below.
- Weight average molecular weight 29400.
- Electron-accepting compound (A_2) No. A-1 ionic compound described in column 0059 of Japanese Patent Application No. 2004-68958 Spin coating conditions
- a uniform thin film having a thickness of 30 nm was formed by the spin coating described above.
- Hole transport layer 4 arylamine compound (H-1) 40 nm
- Emitting layer 5 Host material: sorbazole derivative (E-1) 30 nm
- Dopant Organic iridium complex (D-1) 6% by weight 'Hole blocking layer 6
- Target 2 synthesized in Synthesis Example 1 (HB-1 )
- 5 nm electron transport layer 7 A1 8-hydroxyquinoline complex (ET-1) 30 nm
- the emission characteristics of the device 13 are shown in Table 1-2.
- Table 12 shows the emission characteristics of the device 14.
- a comparative element was prepared in the same manner as in Example 2-1 except that the mixed ligand complex (HB-2) shown below was used instead of the target substance 2 (HB-1) of the hole blocking layer. 1 was produced.
- Table 1 shows the emission characteristics of Comparative Element 1.
- the initial light emission characteristics were almost equal to those of the element 1.
- Comparative element 2 was prepared in the same manner as in (Example 2-2) except that the mixed ligand complex (HB-2) was used instead of the target substance 2 (HB-1) of the hole blocking layer. did.
- Table 12 shows the emission characteristics of Comparative Element 2.
- the initial light emission characteristics were almost the same as those of the element 2.
- Comparative Example 2-3 Preparation of Comparative Element 3
- Comparative element 3 was prepared in the same manner as in (Example 2-3) except that the mixed ligand complex (HB-2) was used instead of the target substance 2 (HB-1) of the hole blocking layer. did.
- Table 12 shows the emission characteristics of Comparative Element 3.
- the initial light emission characteristics were lower in luminous efficiency and luminance per current than element 3. .
- Example 2 ⁇ (Element 1) Object 2 D- 1 A-.1 41 36,100 "16.1 31.5 6.2Example 2—2 (Element 2) Object 2 D-2 A—1 4.1 13,400 3.8 8.0 6.8
- Example 2 -Example 2-3 (Element 3) Target 2 D-3 A-1.. 5.1 14,500 5.9 13.8 7.4
- Example 2-4 (Element 4) Object 6 D-1 A-1 13.49,500 24.8 38.7 4.9
- Example 2—5 (Element 5) Object 1 0 D—1 A—1 4.1 38,900 17.1 31.5 5.8'Example 2—6 (Element 6) Object 15 D—1 A—1 3.1 41; 000. 27. 40 : 4.4.7
- Example 2—7 (Abstract 7) Object 18 D- 1 A- 1.3.5 43,600 30.4 48.5 5.0
- Example 2—8 (Element 8) Object 25 D—1 A—1 '1 31,500 16.4 29.8 5.8
- Example 2-9 (Element!
- Example 2-10 (Element 1 2) Object 50 D—1 A- 1 4.1. 36,060 17.0 • 32.8 6.1
- Example 2-1 1 (element ⁇ 3) Target 2 D—1 A—2 3.0 38,620 27.9 36.6 4.3
- Example 2-1 2 (element “! 4”) Object 38 D— 1 A 2 3.1 39,520 24.1. 32.4 4.3
- Example 2-1 3 (element 1.5)-target 39 D— 1 A— 2 3.4.
- Element 1 element 6, element 7, element 8, and element 12 were subjected to a drive life test under the following conditions.
- Table 3-1 shows the results of a drive life test performed on Comparative Element 1 in the same manner as in Example 3-1.
- Table— 3— 1
- the driving life test was performed on the element 4 and the element 5 under the following conditions.
- the driving characteristics of this device are shown in Table 1-2.
- the elements 4 and 5 have larger LZL 0 after 100 hours and a longer life than the comparative element 1.
- a driving life test was performed on the element 1, the element 8, and the element 11 under the following conditions.
- Comparative Example 3_3 shows the relative time of the example when the time of one element was 1.00. It can be seen that element 1, element 8 and element 11 have a longer lifetime than comparative element 1.
- the comparative element 1 was subjected to a drive life test in the same manner as in Example 3-3, and the result is shown in -3-3.
- Element 13 and element 14 were subjected to a drive life test under the following conditions.
- the device 9 was fabricated in the same manner as in Example 2-1 except that the target compound 2 (HB-1) was used as the main component (host material) of the light emitting layer 5 instead of the carbazole derivative (E-1). Produced.
- Table 5 shows emission characteristics of the device 9.
- the target compound 6 (HB-3) is used as the main component (host material) of the light-emitting layer 5 instead of the carbazole derivative (E-1), and the hole-blocking layer is used instead of target compound 2 (HB-1).
- a device 10 was produced in the same manner as in Example 2-1 except that the target product 6 (HB-3) was used.
- Table 15 shows emission characteristics of the device 10.
- the target substance 57 is used instead of the sorbazole derivative (E-1), and the target substance 2 (HB-1) is used as the hole blocking layer instead of the target substance 2 (HB-1).
- Element 16 was made in the same manner as in Example 2-11 except that target 38 was used.
- Table 14 shows emission characteristics of the device 16.
- the maximum wavelength of the emission spectrum of device 16 was 513 nm, which was identified as being from the organic iridium complex (D-1).
- the target product 57 synthesized in Synthesis Example 23 described below was used as the main component (host material) of the light emitting layer 5, instead of the carbazole derivative (E-1), the target product 57 synthesized in Synthesis Example 23 described below was used; A device 17 was produced in the same manner as in Example 2--11, except that the electron transporting layer was laminated as it was without laminating the hole blocking layer thereon.
- Table 15 shows emission characteristics of the device 17.
- the maximum emission luminance is a value at a current density of 0.25 A / cm 2
- the luminous efficiency-luminance current / voltage is a value at a luminance of 100 cdZm 2 .
- the maximum wavelength of the emission spectrum of the device 17 was 513 nm, which was identified as being from the organic iridium complex (D-1).
- Comparative device 4 was produced in the same manner as in (Example 5-1) except that the luminazole derivative (E-1) was used in place of the target product 57 of the light emitting layer.
- Table 5 shows the emission characteristics of Comparative Element 4.
- the initial light emission characteristics of the device 17 were higher than that of the comparative device 4.
- Element 17 was subjected to a drive life test under the following conditions. Temperature Room temperature
- Table 6 shows the drive characteristics of the element 17.
- LZL 0 is luminance / initial luminance after 150 hours.
- Table 16 shows the results of a drive life test performed on the comparative element 4 in the same manner as in Example 6-1.
- the organic electroluminescent device using the charge transport material of the present invention it is possible to emit light with high luminance and high efficiency, and the stability of the device is improved.
- the charge transport material of the present invention has excellent heat resistance, film forming property, charge transport property, and light emitting property, and therefore, according to the layer structure of the device, a light emitting material, a host material, an electron injection material, an electron transport material, It is also applicable as a hole blocking material or the like.
- the organic electroluminescent device according to the present invention can be used as a flat panel display (for example, a wall-mounted television for an OA computer), a vehicle-mounted display device, a mobile phone display, or a light source utilizing the features of a surface light emitter (for example, a light source of a copier). It can be applied to liquid crystal displays and backlight sources for instruments, display boards, and sign lights, and its technical value is great.
- the compound of the present invention has essentially excellent oxidation-reduction stability, it is also useful to use not only organic electroluminescent devices but also electrophotographic photoreceptors.
- the compound of the present invention is excellent in amorphousness, solubility, heat resistance and durability, in addition to the high performance of the charge transport material of the present invention. Therefore, not only for charge transport materials, but also for luminescent materials, solar cell materials, battery materials (electrolytes, electrodes, separation membranes, stabilizers, etc.), medical materials, paint materials, coating materials, organic materials It is also useful for semiconductor materials, toiletry materials, antistatic materials, and thermoelectric element materials. .
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Abstract
Description
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- 2004-07-29 EP EP13153289.7A patent/EP2592905B1/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
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US7777043B2 (en) | 2010-08-17 |
EP2592905B1 (en) | 2014-11-12 |
US20060186796A1 (en) | 2006-08-24 |
EP1672961A1 (en) | 2006-06-21 |
KR20060096980A (ko) | 2006-09-13 |
KR20100012005A (ko) | 2010-02-03 |
KR100994083B1 (ko) | 2010-11-12 |
EP2592905A1 (en) | 2013-05-15 |
EP1672961A4 (en) | 2008-10-08 |
EP1672961B1 (en) | 2014-12-03 |
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