WO2011110262A1 - Organische elektrolumineszenzvorrichtung - Google Patents
Organische elektrolumineszenzvorrichtung Download PDFInfo
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- WO2011110262A1 WO2011110262A1 PCT/EP2011/000500 EP2011000500W WO2011110262A1 WO 2011110262 A1 WO2011110262 A1 WO 2011110262A1 EP 2011000500 W EP2011000500 W EP 2011000500W WO 2011110262 A1 WO2011110262 A1 WO 2011110262A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- C—CHEMISTRY; METALLURGY
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
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- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/007—Squaraine dyes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/008—Triarylamine dyes containing no other chromophores
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- C09B57/00—Other synthetic dyes of known constitution
- C09B57/10—Metal complexes of organic compounds not being dyes in uncomplexed form
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- 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
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
- H10K50/155—Hole transporting layers comprising dopants
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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
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
- H10K50/165—Electron transporting layers comprising dopants
Definitions
- the present invention relates to organic electroluminescent devices, which contains in at least one hole transport layer, a mixture of at least two materials, one of which is a hole transport material.
- OLEDs organic electroluminescent devices
- OLEDs organic electroluminescent devices
- the technical problem underlying the present invention is therefore to provide an organic electroluminescence direction, which shows a higher power efficiency and / or a longer service life and / or an improved roll-off behavior and / or which has an improvement in the processing of the layers during the production.
- an organic electroluminescent device which in at least one hole transport layer has a
- a hole transport layer is understood as meaning a layer which is arranged between the emitting layer (s), if a plurality of emitting layers are present, and the anode.
- the invention thus relates to an organic electroluminescent device comprising anode, cathode, at least one emitting layer and at least one hole transport layer, which between the
- the hole transport layer contains a mixture of a material HTM and a material HTM-2, characterized in that the HOMO of HTM-1 is at least 0.15 eV higher than the HOMO of HTM-2.
- Neither the material HTM-1 nor the material HTM-2 is a metal complex.
- the materials in the emitting layer and in the hole transport layer according to the invention are not all identical. This means that not all materials in these two layers are identical and present only in a different mixing ratio and that the emitting layer and the hole transport layer must differ in at least one material.
- the HOMO highest occupied molecular orbital
- each layer which is arranged between the emitting layer and the anode is referred to as hole transport layer in the sense of this invention.
- this layer may be directly adjacent to the emitting layer and / or to the anode, or one or more further hole transport layers may be present therebetween.
- the organic electroluminescent device comprises, as described above, anode, cathode, at least one emitting layer and at least one hole transport layer, which are arranged between the anode and the cathode.
- the organic electroluminescent device need not necessarily contain only layers composed of organic or organometallic materials.
- the anode, cathode and / or one or more layers contain inorganic materials or are constructed entirely from inorganic materials.
- the emitting layer may contain phosphorescent and / or fluorescent compounds.
- Electroluminescent device is a compound which shows luminescence at room temperature from an excited state with a higher spin multiplicity, ie a spin state> 1, in particular from an excited triplet state.
- a spin state> 1 in particular from an excited triplet state.
- all luminescent transition metal complexes and all luminescent lanthanide complexes, in particular all luminescent ones are intended Iridium, platinum and copper compounds, as phosphorescent
- a fluorescent compound in the sense of this invention is a compound which exhibits luminescence from an excited singlet state at room temperature.
- all luminescent compounds which are composed only of the elements C, H, D, N, O, S, F, B and P are to be understood as fluorescent compounds.
- the HOMO of HTM-1 is at least 0.25 eV higher than the HOMO of HTM-2. More preferably, the HOMO of HTM-1 is at least 0.3 eV higher than the HOMO of HTM-2.
- the LUMO of HTM-1 and HTM-2 is> -2.6 eV, particularly preferably> -2.5 eV, very particularly preferably> -2.4 eV, in particular> -2.3 eV.
- the hole transport layer according to the invention also consist of a mixture of three, four, five or more different materials. However, it is preferred if the hole transport layer according to the invention consists only of the two materials HTM-1 and HTM-2.
- the mixing ratio of HTM-1 to HTM-2 can vary over a wide range and depends on the exact structure of each
- the mixing ratio of HTM-1 to HTM-2 is between 95: 5 and 5:95, each by volume. Particularly preferred is the mixing ratio of HTM-1 to HTM-2 between 90:10 and 20:80, most preferably between 85:15 and 40:60.
- the organic electroluminescent device directly to the emitting layer.
- the organic electroluminescent device also contains one or more further hole transport layers, which are arranged on the anode side of the hole transport layer according to the invention.
- Such a construction is shown schematically in FIG.
- the layer thickness of the hole transport layer according to the invention comprising HTM-1 and HTM-2 in this device structure is preferably between 5 and 300 nm, particularly preferably between 7 and 220 nm, very particularly preferably between 10 and 50 nm.
- the hole transport layer according to the invention does not directly adjoin the emitting layer, but lies between two further hole transport layers.
- FIG. 1 stands for the anode
- the layer 2 for one or more hole transport layers
- the layer 4 for one or more further hole transport layers layer 5 for the emitting layer and layer 6 for the cathode.
- the layer thickness of the hole transport layer according to the invention comprising HTM-1 and HTM-2 in this device structure is preferably between 5 and 300 nm, particularly preferably between 7 and 220 nm, very particularly preferably between 10 and 50 nm.
- the electroluminescent devices as shown schematically in FIGS. 1 and 2, can also contain further layers, which are not shown here.
- the hole transport layer according to the invention is not a layer in which a hole transport material is doped with a p-dopant.
- a hole transport layer in which a hole transport material is doped with a p-type dopant the effect on roll-off behavior according to the invention can not be achieved in this way.
- the improvement of the processability is not achieved with p-dopants to the extent that they are usually used only up to about 1% dopant concentration.
- a p-type dopant is a material that undergoes a redox reaction with the hole transport material, whereby the hole transport material is oxidized and the p-type dopant is reduced.
- the LUMO of the p-dopant In order to act as a p-dopant, the LUMO of the p-dopant must be lower than the HOMO of the hole-transporting material.
- the LUMO of HTM-2 is higher than the HOMO of HTM. More preferably, the LUMO of HTM-2 is at least 0.1 eV higher than the HOMO of HTM-1.
- the layer according to the invention directly adjoins the emitting layer, it is possible that it also acts as an electron-blocking layer or as an exciton-blocking layer, as well as a hole-transport layer.
- the electron blocking effect is preferred for fluorescent and phosphorescent electroluminescent devices.
- the exciton-blocking effect makes particular demands on the materials, in particular for phosphorescent electroluminescent devices.
- the LUMO of both HTM-1 and HTM-2 should be at least 0.2 eV higher than the LUMO of the matrix in the emitting layer. If in the emitting If two or more matrix materials are used, the LUMO of both HTM-1 and HTM-2 should be at least 0.2 eV higher than the LUMO of the matrix components in the emitting layer that has the deepest LUMO.
- the triplet level of both HTM-1 and HTM-2 should be at most 0.3 eV lower than the triplet level of the emitter in the emitting layer. In a preferred embodiment of the invention, the triplet level of HTM-1 and HTM-2 is at most 0.2 eV lower than the triplet level of the emitter in the emitting layer, more preferably at most 0.1 eV.
- HTM-1 is a material commonly used as a hole transport material.
- HTM-2 other materials may also be used which are not commonly used as hole transport materials.
- the HOMO of HTM-1 is preferably> -5.4 eV, particularly preferably> -5.3 eV, very particularly preferably> -5.2 eV. Further preferred is the HOMO of HTM-1 ⁇ -4.8 eV. The preferred HOMO of HTM-2 results accordingly from the HOMO of HTM-1 and the difference defined above.
- the material HTM-1 is a triarylamine derivative, a carbazole derivative or a fused carbazole derivative.
- a tri Arylamine derivative in the context of this application understood a compound in which three aromatic or heteroaromatic groups are bonded to a nitrogen. It is also possible that the compound contains more than one amino group or that the aromatic groups are bonded together, for example by carbon bridges or direct bonds.
- a carbazole derivative in the sense of this
- a condensed carbazole derivative is understood as meaning a carbazole or azacarbazole to which at least one further aromatic and / or non-aromatic ring has condensed.
- an indolocarbazole or indenocarbazole is spanned.
- an aromatic or heteroaromatic substituent on the nitrogen of the carbazole is connected to the carbazole main body by a single bond or a bridge, for example a carbon bridge.
- Preferred triarylamine derivatives are the compounds of the following formulas (1) to (7),
- Ar 2 is the same or different at each occurrence and is a bivalent, trivalent or tetravalent aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R;
- R 1 is the same or different H, D, F, Cl, Br, I at each occurrence
- Ar 3 is the same or different at each occurrence, an aromatic or heteroaromatic ring system having from 5 to 40 aromatic
- Ring atoms which may be substituted by one or more R 2 radicals;
- R 2 is identical or different at each occurrence, H, D, CN or an aliphatic, aromatic and / or heteroaromatic hydrocarbon radical having 1 to 20 carbon atoms, in which H atoms may be replaced by D or F; two or more adjacent substituents R 2 may also together form a mono- or polycyclic, aliphatic or aromatic ring system.
- Ar 2 in the compounds of the formulas (2), (3), (4) and (7) is a divalent group and in the compounds of the formula (5) a trivalent group and in the compounds of the formula (6) a tetravalent Group.
- Preferred carbazole derivatives are the compounds of the following formulas (8) to (11),
- X is the same or different CR 1 or N at each occurrence, with the proviso that at most two symbols X are N per cycle and that X is C when a group L is bonded to this group X;
- two adjacent groups X can also be replaced by a group of the following formula (12):
- the dashed bonds indicate the linkage of this unit with the carbazole derivative, ie, the two carbon atoms, which in formula (12) to the dashed bonds correspond to the two adjacent groups X of the carbazole; furthermore: Y is the same or different CR or N at each occurrence, with the proviso that at most two symbols Y per cycle are N;
- the linking of the two carbazole groups in formula (9) preferably takes place via the 2,2'-, the 3,3 'or the 2,3-positions, and the
- Linkage of the carbazole group in formula (11) is preferably via the 2- or the 3-position.
- Further preferred materials are compounds which have at least one arylamino group as well as at least one carbazole group or at least one carbazole derivative. These are preferably compounds of the following formulas (13), (14) and (15),
- W is the same or different at each occurrence, a single bond, C (R) 2 , NR 1 , O or S, wherein a maximum of one group W for a
- X is C if a group N (Ar 1 ) 2 or a group Ar 2 or a group W is bound to this group X.
- the linking of the carbazole group with Ar 2 in formula (13) preferably takes place via the 2- or the 3-position.
- An aryl group in the sense of this invention contains at least 6 C atoms;
- a heteroaryl group contains at least 2 C atoms and at least 1 heteroatom, with the proviso that the sum of C atoms and heteroatoms gives at least 5.
- the heteroatoms are preferably selected from N, O and / or S.
- a simple aromatic cycle ie benzene, or a simple heteroaromatic cycle, for example pyridine, pyrimidine, thiophene, etc., or a fused aryl or heteroaryl group, for example naphthalene, anthracene, pyrene, quinoline, isoquinoline, etc., understood.
- An aromatic ring system according to this invention contains
- a heteroaromatic ring system in the sense of this invention contains at least 2 C atoms and at least one heteroatom in the ring system, with the proviso that the Sum of C atoms and heteroatoms is at least 5.
- Heteroatoms are preferably selected from N, O and / or S.
- An aromatic or heteroaromatic ring system in the sense of this invention is to be understood as meaning a system which does not necessarily contain only aryl or heteroaryl groups but in which also several aryl or heteroaryl groups are replaced by a short, non-aromatic moiety (preferably less than 10% of the atoms other than H), such as e.g. As a C, N, O or S atom or a carbonyl group, may be interrupted.
- systems such as 9,9'-spirobifluorene, 9,9-diaryl fluorene, triarylamine, diaryl ether, stilbene, benzophenone, etc.
- aromatic or heteroaromatic ring system is understood as meaning systems in which a plurality of aryl or heteroaryl groups are linked together by single bonds, for example biphenyl, terphenyl or bipyridine.
- o-alkenyl group are preferably ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptyl, octenyl and cyclooctenyl understood.
- octenyl and cyclooctenyl are preferably ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl and octynyl understood.
- a C 1 - to C 4 -alkoxy group is particularly preferably understood as meaning methoxy, trifluoromethoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, s-butoxy, t-butoxy or 2-methylbutoxy.
- aromatic or heteroaromatic ring system with 5-60 aromatic ring atoms which may be substituted in each case with the abovementioned radicals R, and which can be linked via any position on the aromatic or heteroaromatic compounds, are understood in particular to mean groups derived from benzene, naphthalene, anthracene, phenanthrene, benzanthracene, benzphenanthrene, pyrene, chrysene, perylene, fluoranthene, benzfluoranthene, naphthacene, pentacene, Benzopyrene, biphenyl,
- Quinoline isoquinoline, acridine, phenanthridine, benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, phenothiazine, phenoxazine, pyrazole, indazole, imidazole, benzimidazole, naphthimidazole, phenanthrimidazole, pyrimididazole, Pyrazine imidazole, quinoxaline imidazole, oxazole, benzoxazole, naphthoxazole, anthroxazole, phenanthroxazole, isoxazole, 1, 2-thiazole, 1, 3-thiazole, benzothiazole, pyridazine, benzopyridazine, pyrimidine, benzpyrimidine, quinoxaline, 1, 5-diazaanthracene, 2, 7-diazapyrene, 2,3-diazapyrene, 1,6-di
- Preferred groups Ar 1 are selected from the group consisting of phenyl, 2-, 3- or 4-tolyl, 3- or 4-o-xylyl, 2- or 4-m-xylyl, 2-p-xylyl, o-, m- or p-tert-butylphenyl, o-, m- or p-fluorophenyl, 2-, 3- or 4-
- Preferred groups Ar 2 are selected from the group consisting of o-, m- or p-phenylene, 1, 4 or 2,6-naphthylene, 2,2'-, 3,3'- or 4,4'-biphenyl , 2,2 ", 3,3" or 4,4 "-o-terphenyl, 2,2", 3,3 "or 4,4" -m-terphenyl, 2,2 "-, 3 ' , 3 "- or 4,4" -p-terphenyl, p-, m, p-, o, p-, m, m-, o, m- or o, o-quaterphenyl, quinquephenyl, sexiphenyl, 2,7 -fluorenyl, 2,7- or 2,2'-spiro-9,9 '-bifluorenyl or 2,7- (9,10
- the groups Ar 1 and Ar 2 may be substituted by one or more radicals R 1 .
- These radicals R 1 are preferably the same or different in each occurrence selected from the group consisting of H, D, F, a straight-chain alkyl group having 1 to 4 carbon atoms or a branched or cyclic alkyl group having 3 to 5 carbon atoms, each may be substituted by one or more radicals R 2 , wherein one or more H atoms may be replaced by D or F, or an aromatic ring system having 6 to 24 aromatic ring atoms, which may be substituted by one or more radicals R 2 , or a combination of these systems; two or more adjacent substituents R 1 may also together form a mono- or polycyclic, aliphatic or aromatic ring system.
- radicals R 1 are more preferably identical or different in each occurrence selected from the group consisting of H, D or an aromatic ring system having 6 to 24 aromatic Ring atoms which may be substituted by one or more radicals R 2 , but is preferably unsubstituted.
- the radical R 1 on the respective bridges C (R 1 ) 2 is preferably an alkyl group having 1 to 10 C atoms or an aromatic or heteroaromatic ring system having 5 to 24 aromatic ring atoms.
- R 1 is particularly preferably methyl or phenyl
- Ar 1 , Ar 2 , R 1 and R 2 do not contain condensed aryl groups having more than 10 aromatic ring atoms, more preferably no condensed aryl groups at all.
- Examples of suitable materials HTM-1 represented by the above formulas (1) to (1) and (13) to (15) are the following structures.
- compound HTM-2 are in particular carbazole derivatives and
- Carbazole derivatives with fused-on groups such as indenocarbazole derivatives or indolocarbazole derivatives are suitable, as well as dimers of these structures.
- compounds of the formula (15) in which all indices m are 0, or dimers of these compounds are suitable.
- Other suitable compounds which can be used as HTM-2 are diazasilol and tetraazasilol derivatives, in particular with aromatic substituents, as described for example in WO 2010/054729. Further preferred as HTM-2 are diazaphosphole derivatives, as disclosed, for example, in WO 2010/054730. Also suitable as HTM-2 Diazaborolderivate, as disclosed for example in WO 2006/117052.
- Suitable substituents on the diaza- and tetraazasilol derivatives, diazaphosphole derivatives and diazaborolderivaten are aromatic and heteroaromatic ring systems, especially those which with two nitrogen atoms of the diazo and tetraazasilol, diazaphosphole or diazaborols are linked, or alkyl groups.
- these compounds are pure hydrocarbons, especially aromatic hydrocarbons, which may also be substituted by non-aromatic groups.
- these compounds preferably contain no larger condensed aryl groups than naphthalene, more preferably no condensed aryl groups at all.
- a condensed aryl group is meant a group in which two or more phenyl groups are fused directly to each other by a common edge.
- a fluorene group is therefore not a condensed aryl group in the context of the present invention.
- suitable materials HTM-2 are the structures other than those listed above for HTM-1 on structural examples.
- the preferred embodiments are carried out for the emitting layer and for the further layers of the OLED.
- Suitable phosphorescent compounds are, in particular, compounds which emit light, preferably in the visible range, with suitable excitation and also contain at least one atom of atomic number greater than 20, preferably greater than 38 and less than 84, particularly preferably greater than 56 and less than 80.
- Preferred phosphorescence emitters are compounds which are copper, molybdenum, tungsten, rhenium, ruthenium, osmium, rhodium, iridium, palladium, platinum, silver, gold or europium, especially compounds containing iridium, platinum or copper.
- Particularly preferred organic electroluminescent devices contain at least one phosphorescent compound
- R 1 has the same meaning as described above for formula (1), and for the other symbols used: is the same or different at each occurrence, a cyclic group containing at least one donor atom, preferably nitrogen , Carbon in the form of a carbene or phosphorus, via which the cyclic group is bonded to the metal, and which may in turn carry one or more substituents R 1 ; the groups DCy and CCy are linked by a covalent bond; is identical or different at each occurrence, a cyclic group containing a carbon atom through which the cyclic group is bonded to the metal and which in turn may carry one or more substituents R 1 ; is identical or different at each occurrence a mononionic, bidentate chelating ligand, preferably a Diketonatligand.
- R 1 has the same or different at each occurrence, a cyclic group containing at least one donor atom, preferably nitrogen , Carbon in the form of a carbene or phosphorus, via which the cyclic group is
- ring systems between several radicals R 1, there may also be a bridge between two or three ligands CCy-DCy or between one or two ligands CCy-DCy and the ligand A, so that it is a polydentates or polypodal
- matrix material for the phosphorescent compound various materials are used, such as are used according to the prior art as matrix materials for phosphorescent compounds.
- Suitable matrix materials for the phosphorescent emitter are aromatic ketones, aromatic phosphine oxides or aromatic sulfoxides or sulfones, eg. B. according to WO 2004/013080, WO 2004/093207, WO 2006/005627 or WO 2010/006680, triarylamines, carbazole derivatives, z. B. CBP ( ⁇ , ⁇ -biscarbazolylbiphenyl), mCBP or in WO
- WO 2006/117052 triazine derivatives, for. B. according to WO 2007/063754, WO 2008/056746, WO 2010/015306 or according to the not disclosed applications DE 102009053382.6 or DE 102009053645.0, zinc complexes, z. B. according to EP 652273 or WO 09/062578, Diazasilol- or
- Tetraazasilol derivatives eg. B. according to WO 2010/054729, the diazaphosphole derivatives, z. B. according to WO 2010/054730, indenocarbazole derivatives, z. B. according to the unpublished applications DE 102009023155.2 and DE 102009031021.5, bridged Triarylaminderivate, z. B. according to WO 2007/031165 or not disclosed applications DE
- the emitting layer is a fluorescent layer
- it is preferably a layer containing a blue or green, in particular blue fluorescent, dopant and a matrix material.
- Suitable blue and green fluorescent dopants are selected, for example, from the group of monostyrylamines, distyrylamines, tristyrylamines, tetrastyrylamines, styrylphosphines, styryl ethers and arylamines.
- a monostyrylamine is meant a compound containing a substituted or unsubstituted styryl group and at least one, preferably aromatic, amine.
- Distyrylamine is understood to mean a compound containing two substituted or unsubstituted styryl groups and at least one, preferably aromatic, amine.
- a tristyrylamine is understood as meaning a compound which contains three substituted or unsubstituted styryl groups and at least one, preferably aromatic, amine.
- a tetra-styrylamine is understood as meaning a compound which contains four substituted or unsubstituted styryl groups and at least one, preferably aromatic, amine.
- the styryl groups are particularly preferably silibene, which may also be further substituted.
- Corresponding phosphines and ethers are defined in analogy to the amines.
- An arylamine or an aromatic amine in the context of this invention is understood as meaning a compound which contains three substituted or unsubstituted aromatic or heteroaromatic ring systems bonded directly to the nitrogen. At least one of these aromatic or heteroaromatic ring systems is preferably a fused ring system, more preferably at least 14 aromatic ring atoms.
- aromatic anthraceneamines are aromatic anthraceneamines, aromatic pyrenamines, aromatic pyrenediamines, aromatic chrysene amines or aromatic chrysendiamines.
- An aromatic anthracenamine is understood as meaning a compound in which a diarylamino group is bonded directly to an anthracene group, preferably in the 9-position or in the 2-position.
- Aromatic pyrenamines, pyrenediamines, chrysenamines and chrysenediamines are defined analogously thereto, the diarylamino groups on the pyrene preferably being bonded in the 1-position or in the 1, 6-position.
- dopants are selected from indenofluorenamines or -diamines, for example according to WO 2006/08497 or WO 2006/122630, benzoindenofluorenamines or -diamines, for example according to WO 2008/006449, and dibenzoindenofluoren-amines or -diamines, for example according to WO 2007/140847.
- dopants from the class of styrylamines are substituted ones or unsubstituted tristilbeneamines or the dopants described in WO
- Dotands are for example selected from the classes of the oligoarylenes (for example 2,2 ', 7,7'-tetraphenylspirobifluorene according to EP 676461 or dinaphthylanthracene), in particular the oligoarylenes containing condensed aromatic groups, in particular anthracene derivatives, the oligoarylenevinylenes (eg DPVBi or spiro-DPVBi according to EP 676461), the polypodal metal complexes (eg according to WO 2004/081017), the hole-conducting compounds (eg according to WO 2004/058911), the electron-conducting compounds, in particular ketones, phosphine oxides, sulfoxides, etc. (for example according to
- benzanthracene derivatives eg benz [a] anthracene derivatives according to WO 2008/145239 or according to the unpublished application DE 102009034625.
- benzophenanthrene derivatives eg benz [c] phenanthrene derivatives according to WO 20 0 / 083869.
- Particularly preferred host materials are selected from the classes of oligoarylenes containing phenyl, naphthalene, anthracene, Benzanthracen, in particular Benz [a] anthracene, Benzophenanthren, in particular Benz [c] phenanthren, and / or pyrene or atropisomers of these compounds.
- an oligoarylene is to be understood as meaning a compound in which at least three aryl or arylene groups are bonded to one another.
- the organic electroluminescent device may also contain further layers. These are, for example, selected from in each case one or more hole injection layers, hole transport layers, hole blocking layers, electron transport layers, electron injection layers, electron blocking layers, exciton blocking layers, charge transfer layers. generation layers (charge generation layers) and / or organic or inorganic p / n transitions. In addition, there may be two or more emitting layers that produce such white emission. It can also be the use of three or more
- emitting layers are preferred. Furthermore, intermediate layers can be present between several emitting layers. Furthermore, these additional layers, for example, the
- Charge transport layers also be doped.
- the doping of the layers may be advantageous for improved charge transport. It should be noted, however, that not necessarily each of these layers must be present and the choice of layers always depends on the compounds used.
- Preferred as the cathode of the electroluminescent device according to the invention are low work function metals, metal alloys or multilayer structures of different metals, such as alkaline earth metals, alkali metals, main group metals or lanthanides (eg Ca, Ba, Mg, Al, In, Mg, Yb, Sm, Etc.).
- alkaline earth metals alkali metals
- main group metals or lanthanides eg Ca, Ba, Mg, Al, In, Mg, Yb, Sm, Etc.
- further metals which have a relatively high work function, such as, for example, B. Ag, which then usually combinations of metals, such as Mg / Ag, Ca / Ag or Ba / Ag are used.
- metal alloys in particular alloys of an alkali metal or alkaline earth metal and silver, particularly preferably an alloy of Mg and Ag. It may also be preferred to introduce between a metallic cathode and the organic semiconductor a thin intermediate layer of a material with a high dielectric constant.
- alkali metal or alkaline earth metal fluorides but also the corresponding oxides or carbonates (eg LiF, L 12 O, CsF, CS 2 CO 3, BaF 2 , MgO, NaF, etc.).
- organic alkali or alkaline earth metal complexes in question such as.
- lithium quinolinate (LiQ) lithium quinolinate (LiQ).
- the layer thickness of this layer is preferably between 0.5 and 5 nm.
- materials having a high work function are preferred.
- the anode has a work function greater than 4.5 eV. Vacuum up.
- metals with a high redox potential such as Ag, Pt or Au
- metal / metal oxide electrodes eg Al / Ni / NiO x , Al / PtO x
- At least one of the electrodes must be transparent or partially transparent in order to enable the extraction of light.
- Preferred anode materials here are conductive mixed metal oxides. Particularly preferred are indium tin oxide (ITO) or indium zinc oxide (IZO). Preference is furthermore given to conductive, doped organic materials, in particular conductive doped polymers.
- the device is structured accordingly (depending on the application), contacted and finally hermetically sealed because the life of such devices drastically shortened in the presence of water and / or air.
- Suitable charge transport materials as used in Lochinjetechnische transport layer or in the electron transport layer of the organic electroluminescent device according to the invention are, for example, the compounds disclosed in Y. Shirota et al., Chem. Rev. 2007, 107 (4), 953-1010 or other materials as known from the prior art Technique can be used in these layers.
- Examples of preferred hole transport materials which can be used in a hole transport or hole injection layer in the electroluminescent device according to the invention are indenofluorenamines and derivatives (for example according to WO 2006/122630 or WO
- Suitable hole transport or hole injection materials are all materials listed above for HTM-1.
- materials for the electron transport layer it is possible to use all materials as used in the prior art as electron transport materials in the electron transport layer.
- aluminum complexes for example Alq 3
- zirconium complexes for example Zrq 4
- benzimidazole derivatives triazine derivatives or aromatic ketones are suitable.
- Suitable materials are, for example, the materials listed in the following table. Further suitable materials are derivatives of the compounds depicted above, as disclosed in JP 2000/053957, WO 2003/060956, WO 2004/028217, WO 2004/080975 and WO 20/072300.
- the electron transport layer is doped. Suitable dopants are alkali metals or alkali metal compounds, such as LiQ (lithium quinolinate).
- the electron transport layer is doped in particular when the electron transport material is a benzimidazole derivative or a triazine derivative.
- the preferred dopant is LiQ.
- an organic electroluminescent device characterized in that one or more layers are coated with a sublimation process.
- the materials in vacuum sublimation systems become smaller at an initial pressure
- an organic electroluminescent device characterized in that one or more layers are coated with the OVPD (Organic Vapor Phase Deposition) method or with the aid of a carrier gas sublimation.
- the materials are applied at a pressure between 10 "applied 5 mbar and 1 bar.
- OVJP organic vapor jet printing
- the materials are applied directly through a nozzle and patterned (eg. BMS Arnold et al., Appl. Phys. Lett., 2008, 92, 053301).
- an organic electroluminescent device characterized in that one or more layers of solution, such. B. by spin coating, or with any printing process, such.
- any printing process such as screen printing, flexographic printing, offset printing, LITI (Light Induced Thermal Imaging, thermal transfer printing), ink-jet printing (inkjet printing) or Nozzle-Printing, are produced.
- soluble compounds are needed. High solubility can be achieved by suitable substitution of the compound reach. Not only solutions from individual can do this
- the organic electroluminescent device may also be made by depositing one or more layers of solution and depositing one or more other layers.
- the organic electroluminescent device according to the invention has one or more of the following surprising advantages over the prior art:.
- the organic electroluminescent device according to the invention has an improved efficiency.
- the organic electroluminescent device according to the invention simultaneously has an improved lifetime.
- the organic electroluminescent device according to the invention has a reduced roll-off, ie a reduced decrease in efficiency at high luminance.
- organic electroluminescent device according to the invention can be produced with less technical effort than electroluminescent devices which instead of the layer according to the invention contain a pure layer of a triarylamine derivative.
- the organic electroluminescent device according to the invention can be used for various applications, for example for monochrome or multicolor displays, for illumination applications, for medical applications, for example in phototherapy, or for organic lasers (O-lasers).
- inventive OLEDs and OLEDs according to the prior art is carried out according to a general method according to WO 2004/058911, based on the circumstances described here
- ITO indium tin oxide
- PEDOT poly (3,4-ethylenedioxy-2,5-thiophene), spin-on from water
- the OLEDs have in principle the following layer structure: substrate / hole injection layer (HIL) / optional interlayer (IL) / hole transport layer (HTL) / emission layer (EML) / optional hole blocking layer (HBL) / electron transport layer (ETL) / optional electron injection layer (EIL) and finally a cathode ,
- HIL hole injection layer
- IL hole transport layer
- HBL emission layer
- HBL hole blocking layer
- ETL electron transport layer
- EIL electron injection layer
- EIL electron injection layer
- cathode is formed by a 100 nm thick aluminum layer.
- the hole transport layer can consist of two individual layers HTL1 and HTL2.
- Table 1 The materials used to make the OLEDs are shown in Table 3.
- the emission layer always consists of at least one matrix material (host material, host material) and an emitting dopant (dopant, emitter), which is admixed to the matrix material or the matrix materials by co-evaporation in a specific volume fraction.
- An indication such as ST1: TEG1 (85%: 15%) means that the material ST1 is present in a volume fraction of 85% and TEG1 in a volume fraction of 15% in the coating.
- the electron transport layer can also consist of a mixture of two materials.
- the hole transport layers according to the invention consist of a mixture of two materials.
- the OLEDs are characterized by default. For this, the electroluminescence spectra, the current efficiency (measured in cd / A), the power efficiency (measured in Im / W) and the external quantum efficiency (EQE, measured in percent) as a function of the luminance, calculated from current-voltage-luminance characteristics ( LUL characteristics) and the service life.
- the parameter S is a measure of the strength of the "roll-off", ie the drop in efficiency to higher luminances, defined as current efficiency at 5000 cd / m 2 divided by the current efficiency
- the lifetime LD is defined as the time after which the luminance drops from the start luminance L0 to a certain proportion L1 in a constant current operation.
- the values for the lifetime can be known with the aid of those skilled in the art
- Conversion formulas are converted to an indication for other starting luminance densities.
- life for a starting luminous flux of 1000 cd / m 2 is a common statement.
- the data of the different OLEDs are summarized in Table 2.
- Examples V1-V13 are comparative examples according to the prior art, examples E1-E34 show data of inventive OLEDs.
- Examples N1-N3 do not show examples according to the invention which serve for comparison with the examples according to the invention and illustrate their advantages.
- the HOMO and LUMO layers as well as the triplet level of the materials are determined by quantum chemical calculations.
- the program package "Gaussian03W” (Gaussian Inc.) is used
- these values are to be regarded as HOMO or LUMO of the materials.
- HOMO or LUMO of the materials As an example, for substance A1 from the calculation, a HOMO of -0.17519 Hartrees and a LUMO of -0.04192 Hartrees are obtained, which corresponds to a calibrated HOMO of -5.14 eV and a calibrated LUMO of -2.27 eV.
- the triplet level TN is defined as the energy of the triplet state with the lowest energy, which results from the quantum chemical calculation.
- Table 4 shows the HOMO and LUMO values as well as the triplet levels TN of the different materials.
- FIGS 3 and 4 show the dependence of the efficiency of the luminance for the OLEDs of Examples V1 and E1-E4. The waste to higher
- Luminance is typical of OLEDs of all kinds, but especially for OLEDs with phosphorescent dopants. It can be seen that by using a hole transport layer according to the invention, the shape of the efficiency curve can be influenced significantly positively, i. H. the course is substantially flatter than when using a hole transport layer according to the prior art. This applies both to a layer consisting of A1 and C1 in addition to a 70 nm thick layer of A1 (examples E3 and E4), and also to the replacement of the complete layer A1 by a layer consisting of A1 and C1 (examples E1 and E2).
- the improvement of the "roll-off" is expressed in the increase of the parameter S, which improves from 0.84 (example V1) to 0.92 (examples E1, E2, E3) or 0.94 (example E4).
- the efficiency is very high with very low luminance levels in OLEDs according to the prior art, this is compensated by the improved efficiency at high luminances in OLEDs according to the invention, since the OLED in a display is typically operated over the entire luminance range and the highest
- Examples V5, N2 Improvement of the roll-off can be achieved, but you get one significantly increased operating voltage, inferior efficiency and 60% reduced lifetime (Examples V5, N2). With IC1 as the second component, a good voltage can be achieved, but the efficiency is reduced and the lifetime is almost halved (Examples V5, N3). Similar effects are seen when using the combination A1 / A4, where you get a slightly improved efficiency, but also a significantly increased operating voltage and a reduced life (Examples V1, V9, N1). It should be noted that the slightly different dopant concentration in Examples V1 and V9 (15% vs. 12%) has only a negligible effect on the data of the OLEDs.
- hole transport layers according to the invention improve the roll-off.
- a significant improvement in life and / or efficiency can be achieved.
- the efficiency increased by nearly 15%, in addition to the improvement of S from 0.88 to 0.93. Because the Voltage increases only very slightly, this also gives a much improved power efficiency.
- the lifetime increases significantly by about 60% (Examples V8, E17).
- FIG. 5a shows the formation of an edge of material A2 on a 200 ⁇ m wide slot of a shadow mask after vapor deposition of a 3.7 ⁇ m thick layer.
- FIG. 5b shows the edge after vapor deposition of a 3.7 ⁇ m thick layer of a 50%: 50% mixture of A2 and C7. After evaporation of
- V1 HTM1 HIL1 - A1 IC1 TEG1 - ST1: LiQ -
- V2 HTM1 HIL1 - A1 IC1 TEG1 ST1 STV.LiQ -
- V5 HTM1 HIL1 - A2 IC1 TEG1 - ST1.QG - 70nm 5nm 90nm (90%: 10%) 30nm (50%: 50%) 40nm
- V6 HT 1 HIL1 - A2 IC1 TEG1 ST1 ST1: LiQ - 70nm 5nm 90nm (90%: 10%) 30nm 10nm (50%: 50%) 40nm
- V7 HTM1 HIL1 - A2 IC2 TEG1 - ST1: LiQ - 70nm 5nm 90nm (90%: 10%) 30nm (50%: 50%) 40nm
- V8 HTM1 HIL1 - A3 IC1 TEG1 ST1 ST1: LiQ - 70nm 5nm 90nm (88%: 12%) 30nm 10nm (50%: 50%) 30nm
- V9 HTM1 HIL1 NPB A4 IC1 TEG1 - ST1: LiQ - 70nm 5nm 50nm 40nm (88%: 12%) 30nm (50%: 50%) 30nm
- V10 HTM1 - - NPB ST1 TER1 - Alq 3 LiF 20nm 20nm (85%: 15%) 30nm 20nm 1nm
- V11 HT 1 - - NPB ST1 TER2 - Alq 3 LiF 20nm 20nm (85%: 15%) 30nm 20nm 1nm
- V12 HTM1 HIL1 - A5 IC1 TEG1 - ST1: LiQ - 70nm 5nm 90nm (85%: 15%) 30nm (50%: 50%) 40nm
- V13 HTM1 HIL1 - A1 M1 D1 - ST2: LiQ - 140nm 5nm 20nm (95%: 5%) 20nm (50%: 50%) 30nm
- N1 HTM1 HIL1 NPB A1 A4 IC1: TEG1 - ST1: LiQ - 70nm 5nm 50nm (60%: 40%) 90nm (88%: 12%) 30nm (50%: 50%) 30nm
- N2 HTM1 HIL1 A2 A2 TEG1 IC1: TEG1 - ST1: LiQ - 70nm 5nm 50nm (80%: 40%) 50nm (90%: 10%) 30nm (50%: 50%) 30nm
- N3 HT1 HIL1 A2 A2 IC1 IC1: TEG1 - ST1: LiQ - 70nm 5nm 50nm (80%: 30%) 50nm (90%: 10%) 30nm (50%: 50%) 30nm
- E1 HTM1 HIL1 - A1 C1 IC1: TEG1 - ST1: LiQ - 70nm 5nm (45%: 55%) 90nm (85%: 15%) 30nm (50%: 50%) 40nm
- E2 HT 1 HIL1 - A1 C1 IC1.
- TEG1 - ST1 LiQ - 70nm 5nm (55%: 45%) 90nm (85%: 15%) 30nm (50%: 50%) 40nm
- E3 HTM1 HIL1 A1 C1 IC1: TEG1 - ST1.UQ - 70nm 5nm 70nm (45%: 55%) 20nm (85%: 15%) 30nm (50%: 50%) 40nm
- E4 HTM1 HIL1 A1 C1 IC1: TEG1 - ST1: LiQ - 70nm 5nm 70nm (55%: 45%) 20nm (85%: 15%) 30nm (50%: 50%) 40nm
- E5 HTM1 HIL1 A1 C1 ST1: TEG1 - ST1: UQ - 70nm 5nm 70nm (55%: 45%) 20nm (85%: 15%) 30nm (50%: 50%) 40nm
- E6 HT 1 H1L1 A1 C1 IC2: TEG1 - ST1: LiQ - 70nm 5nm 70nm (55%: 45%) 20nm (85%: 15%) 30nm (50%: 50%) 40nm
- E8 HTM1 HIL1 - A1 C3 IC1: TEG1 - ST1: LiQ - 70nm 5nm (50%: 50%) 90nm (85%: 15%) 30nm (50%: 50%) 40nm
- E9 HT 1 HIL1 A1 A1.C4 IC1.TEG1 - ST1 LiQ - 70nm 5nm 70nm (45%: 55%) 20nm (85%: 15%) 30nm (50%: 50%) 40nm
- E10 HTM1 HIL1 A1 C8 IC1 EG1 - ST1: LiQ 70nm 5nm 70nm (55%: 45%) 20nm (85%: 15%) 30nm (50%: 50%) 40nm
- E11 HTM1 ⁇ - NPB C1 ST1: TER1 - Alq 3 LiF 20nm (40%: 60%) 20nm (85%: 15%) 30nm 20nm 1nm
- E12 HTM1 HIL1 - A2 C1 IC1: TEG1 - ST1: LiQ - 70nm 5nm (50%: 50%) 90nm (90%: 10%) 30nm (50%: 50%) 40nm
- E13 HT 1 HIL1 - A2 C1 IC1: TEG1 - ST1: LiQ - 70nm 5nm (60%: 40%) 90nm (90%: 10%) 30nm (50%: 50%) 40nm
- E14 HT 1 HIL1 - A2 C1 IC1: TEG1 - ST1: LiQ - 70nm 5nm (70%: 30%) 90nm (90%: 10%) 30nm (50%: 50%) 40nm
- E16 HTM1 HIL1 - A2 C1 IC2: TEG1 - ST1: LiQ - 70nm 5nm (70%: 30%) 90nm (90%: 10%) 30nm (50%: 50%) 40nm
- E18 HT 1 HIL1 - A3 C6 IC1: TEG1 ST1 ST1: LiQ - 70nm 5nm (50%: 50%) 90nm (88%: 12%) 30nm 10nm (50%: 50%) 30nm
- HTM1 HIL1 A2 A2 C1 IC1: TEG1 - ST1: LiQ - 70nm 5nm 40nm (60%: 40%) 50nm (90%: 10%) 30nm (50%: 50%) 40nm
- HTM1 HIL1 A2 A2 C1 IC1: TEG1 - ST1: LiQ - 70nm 5nm 40nm (70%: 30%) 50nm (90%: 10%) 30nm (50%: 50%) 40nm
- TEG1 - ST1 LiQ - 70nm 5nm 50nm (45%: 55%) 40nm (88%: 12%) 30nm (50%: 50%) 30nm
- HTM1 HIL1 - A1 C6 (30%: 70%)
- IC1 TEG1 ST1 ST1: LiQ - 70nm 5nm 90nm (88%: 12%) 30nm 10nm (50%: 50%) 30nm
- HTM1 HIL1 - A1 C6 (50%: 50%)
- IC1 TEG1 ST1 ST1: LiQ - 70nm 5nm 90nm (88%: 12%) 30nm 10nm (50%: 50%) 30nm
- HTM1 HIL1 - A5 C1 IC1: TEG1 - ST1: LiQ -
- E26 HTM1 HIL1 - A2 C7 IC1: TEG1 ST1 ST1: LiQ - 70nm 5nm (50%: 50%) 90nm (90%: 10%) 30nm 10nm (50%: 50%) 40nm
- E27 HT 1 HIL1 - A2 C7 IC1: TEG1 ST1 ST1: LiQ - 70nm 5nm (60%: 40%) 90nm (90%: 10%) 30nm 10nm (50%: 50%) 40nm
- E28 HT 1 HIL1 - A1.C1 1.D1 - ST2 LiQ - 140nm 5nm (70%: 30%) 20nm (95%: 5%) 20nm (50%: 50%) 30nm
- E29 HT 1 HIL1 - A1 C9 IC1: TEG1 ST1 ST1: LiQ - 70nm 5nm (65%: 35%) 90nm (88%: 12%) 30nm 10nm (50%: 50%) 30nm
- HTM1 HIL1 - A1 C10 IC1: TEG1 ST1 ST1: LiQ - 70nm 5nm (70%: 30%) 90nm (88%: 12%) 30nm 10nm (50%: 50%) 30nm
- E31 HTM1 HIL1 - A2 C8 IC1: TEG1 ST1 STV.LiQ - 70nm 5nm (70%: 30%) 90nm (90% .10%) 30nm 10nm (50%: 50%) 40nm
- E32 HTM1 HIL1 A2 A2 C8 IC1: TEG1 ST1 ST1: LiQ - 70nm 5nm 40nm (70%: 30%) 50nm (90%: 10%) 30nm 10nm (50%: 50%) 40nm E33 ⁇ / 11 HIL1 - A1.C11 IC1.TEG1 - ST1: LiQ - 70nm 5nm (45%: 55%) 90nm (85%: 15%) 30nm (50%: 50%) 40nm
- E34 HTM1 HIL1 A1 C12 IC1: TEG1 - ST1: LiQ - 70nm 5nm (60%: 40%) 90nm (85%: 15%) 30nm (50% .50%) 40nm
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Abstract
Description
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| KR1020127026075A KR101760154B1 (ko) | 2010-03-06 | 2011-02-03 | 유기 전계발광 디바이스 |
| JP2012556394A JP6071559B2 (ja) | 2010-03-06 | 2011-02-03 | 有機エレクトロルミネッセントデバイス |
| US13/582,572 US9434877B2 (en) | 2010-03-06 | 2011-02-03 | Organic electroluminescent device |
| DE112011100815T DE112011100815A5 (de) | 2010-03-06 | 2011-02-03 | Organische Elektrolumineszenzvorrichtung |
| CN201180012718.7A CN102782084B (zh) | 2010-03-06 | 2011-02-03 | 有机电致发光器件 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102782084A (zh) | 2012-11-14 |
| US9434877B2 (en) | 2016-09-06 |
| DE102010010481A1 (de) | 2011-09-08 |
| DE112011100815A5 (de) | 2013-02-07 |
| JP2013522864A (ja) | 2013-06-13 |
| KR20130038218A (ko) | 2013-04-17 |
| JP6071559B2 (ja) | 2017-02-01 |
| CN102782084B (zh) | 2016-02-10 |
| US20120326141A1 (en) | 2012-12-27 |
| KR101760154B1 (ko) | 2017-07-31 |
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