EP2344608A1 - Materialien für organische elektrolumineszenzvorrichtungen - Google Patents

Materialien für organische elektrolumineszenzvorrichtungen

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Publication number
EP2344608A1
EP2344608A1 EP09736572A EP09736572A EP2344608A1 EP 2344608 A1 EP2344608 A1 EP 2344608A1 EP 09736572 A EP09736572 A EP 09736572A EP 09736572 A EP09736572 A EP 09736572A EP 2344608 A1 EP2344608 A1 EP 2344608A1
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EP
European Patent Office
Prior art keywords
atoms
organic
aromatic
formula
radicals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP09736572A
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German (de)
English (en)
French (fr)
Inventor
Amir Hossain Parham
Arne Buesing
Anja Gerhard
Joachim Kaiser
Rocco Fortte
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Merck Patent GmbH
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Merck Patent GmbH
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Publication of EP2344608A1 publication Critical patent/EP2344608A1/de
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
    • C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
    • C07F15/0086—Platinum compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
    • C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
    • C07F15/006—Palladium compounds
    • 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
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/14—Styryl dyes
    • 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
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/14—Styryl dyes
    • C09B23/145—Styryl dyes the ethylene chain carrying an heterocyclic residue, e.g. heterocycle-CH=CH-C6H5
    • 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
    • C09B55/00—Azomethine dyes
    • C09B55/002—Monoazomethine dyes
    • C09B55/003—Monoazomethine dyes with the -C=N- group attached to an heteroring
    • 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
    • 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
    • C09B57/10—Metal complexes of organic compounds not being dyes in uncomplexed form
    • 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
    • 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
    • H10K85/30—Coordination compounds
    • H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
    • H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
    • H10K85/346—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising platinum
    • 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
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1018—Heterocyclic compounds
    • C09K2211/1022—Heterocyclic compounds bridged by heteroatoms, e.g. N, P, Si or B
    • 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
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1018—Heterocyclic compounds
    • C09K2211/1025—Heterocyclic compounds characterised by ligands
    • C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
    • 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
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/18—Metal complexes
    • C09K2211/185—Metal complexes of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/917—Electroluminescent

Definitions

  • the present invention relates to transition metal complexes of the general formulas I or II, in particular as emitter molecules in organic electronic devices, to a layer and to an electronic device which contain the compounds according to the invention, and to a process for preparing the compounds according to the invention.
  • Chelate complexes and organometallic compounds are used as functional materials in a number of different applications, which can be attributed to the electronics industry in the broadest sense.
  • organic electroluminescent devices based on organic components (general description of the structure, cf., US Pat. Nos. 4,539,507 and 5,151,629) or their individual components, the organic light-emitting diodes (OLEDs), the market introduction has already taken place. Despite the successes already achieved, further improvements are desirable here.
  • organometallic complexes which exhibit phosphorescence rather than fluorescence are increasingly being discussed (M.A. Baldo, S. Lamansky, P.E. Burrows, M.E. Thompson, S.R. Forrest, Appl. Phys. Lett., 1999, 75, 4-6).
  • organometallic compounds As essential conditions for the practical application here are in particular a high operating life, a high stability against temperature load and a low application and operating voltage to enable mobile applications to call.
  • Metal complexes of the transition metals of group 10 in which the central metal has two aromatic N and two C atoms (WO 2004/108857, WO 2005/042550 , WO 2005/042444, US 2006/0134461 A1) or two imine-like N atoms in combination with two phenolic O atoms (WO 2004/108857) or via two aromatic N and two basic N atoms (WO 2004/108857) is bound.
  • the known compounds have, inter alia, electroluminescence in the blue, red and green regions of the electromagnetic spectrum.
  • the object of the invention was thus to provide such compounds.
  • the present invention provides a compound of general formula I.
  • M is a metal ion of oxidation state +2
  • Ar is the same or different at each occurrence an aromatic or heteroaromatic ring system which may be substituted by one or more arbitrary radicals R and the ring systems Ar may optionally be linked together by single bonds or any radicals R, Y is the same or different at every occurrence C 1 N or P, with the proviso that always two C atoms and two N atoms or always two C atoms and two P atoms are bound to the metal,
  • R 1 is any residue.
  • the present invention further provides a compound of general formula II
  • M is a metal ion of oxidation state +2
  • Ar is the same or different at each occurrence an aromatic or heteroaromatic ring system which may be substituted by one or more arbitrary radicals R and the ring systems Ar may optionally be linked together by single bonds or any radicals R,
  • Y is the same or different at each occurrence C, N or P, with the proviso that always two C atoms and two N atoms or always two C atoms and two P atoms are bound to the metal,
  • R 1 is any residue. In a preferred embodiment of the invention is in the compounds of general formula I or II
  • Ar is the same or different at each occurrence an aromatic or heteroaromatic ring system which may be substituted by one or more arbitrary radicals R and the ring systems Ar may optionally be linked together by single bonds or any radicals R,
  • Ar 1 is identical or different at each occurrence, an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may be substituted by one or more non-aromatic radicals R,
  • R 1 is the same or different at each occurrence H, D, F, CF 3 , CN, a
  • Alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having from 3 to 40 carbon atoms, each of which may be substituted with one or more R 2 groups, wherein one or more non-adjacent CH 2 groups is represented by R 2 C CR 2 , C ⁇ C, Si (R 2 ) 2 , Ge (R 2 ) 2 , Sn (R 2 ) 2 , and wherein one or more H atoms are represented by D, F, Cl, Br,
  • I, CN or NO 2 may be replaced, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, each of which may be substituted by one or more radicals R 2 , or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, the may be substituted by one or more radicals R 2 , or a combination of these systems, wherein R 1 may also form with R a mono- or polycyclic, aliphatic or aromatic ring system,
  • R 2 is identical or different at each occurrence H, D, F, CN or an aliphatic, aromatic and / or heteroaromatic hydrocarbon radical having 1 to 20 carbon atoms, in which also one or more H atoms may be replaced by F, where two or more substituents R 2 also together form a mono- or polycyclic, aliphatic or aromatic ring system.
  • M is Pd or equal to Pt. More preferably, M is Pt.
  • Ar is identical or different at each occurrence, an aromatic or heteroaromatic ring system having 5 to 10 aromatic ring atoms, which may be substituted by a plurality of radicals R,
  • Y is identical or different at each occurrence C or N, with the proviso that always two C atoms and two N atoms are bound to the metal
  • R is identical or different at each occurrence H, N (Ar 1 J 2 , CN, a straight-chain alkyl group having 1 to 10 C atoms, or an aromatic or heteroaromatic ring system having 5 to 15 aromatic ring atoms, each by one or more
  • Radicals R 2 may be substituted
  • R 1 is the same or different at each occurrence H, D, CN, a
  • R 2 is identical or different in each occurrence, is H, F, CN or an aliphatic, aromatic and / or heteroaromatic hydrocarbon radical having 1 to 20 C atoms, where two or more
  • Substituents R 2 can also form a mono- or polycyclic, aliphatic or aromatic ring system with each other;
  • Ar 1 is as defined above.
  • radicals occur several times within a compound, the radicals independently of one another on each occurrence can be the same or different, as defined.
  • An aryl group in the sense of this invention contains 6 to 60 C atoms; a heteroaryl group in the context of this invention contains 2 to 60 carbon atoms and at least one heteroatom, with the proviso that the sum of
  • heteroatoms are preferably selected from N, O and / or S.
  • aryl group or heteroaryl either a simple aromatic cycle, ie benzene, or a simple heteroaromatic cycle, for example pyridine, pyrimidine, thiophene, etc., or a condensed (fused) aryl or heteroaryl group, for example, naphthalene, anthracene, phenanthrene, quinoline, isoquinoline, carbazole, etc., understood.
  • An aromatic ring system in the sense of this invention contains 6 to 60 carbon atoms in the ring system.
  • a heteroaromatic ring system in the sense of this invention contains 2 to 60 C atoms and at least one heteroatom in the ring system, 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.
  • 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 Heteroaryl groups by a non-aromatic unit (preferably less than 10% of the atoms other than H), such as.
  • N or O atom may be interrupted.
  • systems such as 9,9'-spirobifluorene, 9,9-diarylfluorene, triarylamine, diaryl ethers, stilbene, etc. are to be understood as aromatic ring systems in the context of this invention, and also systems in which two or more aryl groups, for example by a linear or cyclic alkyl group or interrupted by a silyl group.
  • An aromatic or heteroaromatic ring system having 5-60 aromatic ring atoms, which may be substituted in each case by the abovementioned radicals R 1 and which may be linked via any position on the aromatic or heteroaromatic compounds, is understood in particular to mean groups derived from benzene , Naphthalene, anthracene, benzanthracene, phenanthrene, pyrene, chrysene, perylene, fluoranthene, naphthacene, pentacene, benzpyrene, biphenyl, biphenylene, terphenyl, terphenylene, fluorene, spirobifluorene,
  • an aliphatic hydrocarbon radical or an alkyl group which may typically contain from 1 to 40 or also from 1 to 20 carbon atoms, and in which also individual H atoms or Ch.sup.1 - groups are substituted by the abovementioned groups prefers the radicals methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, 2-methylbutyl, n-pentyl, s-pentyl, cyclopentyl, n- Hexyl, cyclohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl, ethenyl, propeny
  • alkoxy group having 1 to 40 carbon atoms methoxy, trifluoromethoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy, n-pentoxy, s-pentoxy, 2-methylbutoxy, n-hexoxy, cyclohexyloxy, n-heptoxy, cycloheptyloxy, n-octyloxy, cyclooctyloxy, 2-ethylhexyloxy, pentafluoroethoxy and 2,2,2-trifluoroethoxy understood.
  • a thioalkyl group having 1 to 40 carbon atoms in particular methylthio, ethylthio, n-propylthio, i-propylthio, n-butylthio, i-butylthio, s-butylthio, t-butylthio, n-pentylthio, s-pentylthio, n-hexylthio, cyclohexylthio, n-heptylthio, cycloheptylthio, n-octylthio, cyclooctylthio, 2-ethylhexylthio, Trifluoromethylthio, pentafluoroethylthio, 2,2,2-trifluoroethylthio, ethenylthio, propenylthio, butenylthio, pentenylthio, cyclopentenylthio,
  • one or more H atoms can also be replaced by F, Cl, Br, I, CN or NO 2 , preferably F, Cl or CN, more preferably F or Cl, particularly preferably F.
  • a preferred embodiment of the compounds according to the formulas I and II are the compounds according to one of the following formulas IM to IV,
  • X is CR or N.
  • a maximum of two symbols X more preferably at most one symbol X per cycle for N, and the other symbols X in this cycle stand for CR.
  • all groups X are in one cycle for CR.
  • Particularly preferred embodiments of the abovementioned compounds are the compounds of the following formulas V to XVI:
  • the compounds according to the invention are preferably square-planar complexes or approximately square-planar complexes which contain a four-coordinate metal ion in the oxidation state +2.
  • the metal is preferably selected from metals of the tenth group of the Periodic Table of the Elements, in particular Pd and Pt.
  • the compounds of the invention have a triplet emission and have a very good life, high efficiency, high stability to thermal stress and a high glass transition temperature Tg.
  • the invention also provides a process for the preparation of a compound of general formula I or II
  • a reaction with the corresponding metal for example, Pt or Pd
  • a suitable metal salt for example K 2 PtCl 4 or K 2 PdCl 4
  • O-ICs organic field-effect transistors
  • O-TFTs organic thin-film transistors
  • O-LETs organic light-emitting transistors
  • O-SCs organic solar cells
  • organic optical detectors organic photoreceptors
  • O-FQDs organic FeId quench devices
  • LECs organic laser diodes
  • O-lasers organic laser diodes
  • the invention particularly relates to the use of the compounds according to the invention as emitter compound and / or as charge transport material and / or charge injection material, preferably in a corresponding layer.
  • These can be either hole transport layers, hole injection layers, electron transport layers or electron injection layers.
  • organic electronic devices such as. B. organic electroluminescent devices or polymeric electroluminescent devices (OLED, PLED), organic integrated circuits (O-ICs), organic field effect transistors (O-FETs), organic thin-film transistors (O-TFTs), organic light-emitting transistors (O-LETs) , organic solar cells (O-SCs), organic optical detectors, organic photoreceptors, organic field quench devices (O-FQDs), light-emitting electrochemical
  • OLED organic electroluminescent devices or polymeric electroluminescent devices
  • O-ICs organic integrated circuits
  • O-FETs organic field effect transistors
  • OF-TFTs organic thin-film transistors
  • O-LETs organic light-emitting transistors
  • O-SCs organic solar cells
  • organic optical detectors organic photoreceptors
  • O-FQDs organic field quench devices
  • An organic electronic device in the sense of this invention is understood to mean an electronic device comprising anode, cathode and at least one layer, which contains at least one organic material. In this case, the device may also contain inorganic materials in addition to the organic material.
  • the compound of formula I or II is in the electronic
  • the invention thus also provides a layer containing a compound of the formula I or II, as defined above.
  • the organic electroluminescent device includes cathode, anode and at least one emitting layer.
  • they may also contain further layers, for example one or more hole injection layers, hole transport layers, hole blocking layers, electron transport layers, electron injection layers, exciton blocking layers and / or charge generation layers (Charge Generation Layers, IDMC 2003, Taiwan, Session 21 OLED (5), T. Matsumoto, T. Nakada, J. Endo, K. Mori, N. Kawamura, A. Yokoi, J. Kido, Multiphoton Organic EL Device Having Charge Generation Layer).
  • interlayer can be introduced between two emitting layers, which have, for example, an exciton-blocking function. It should be noted, however, that not necessarily each of these layers must be present. These layers may contain compounds of general formula I or II as defined above.
  • the compound according to formula I or II is used as the emitting compound in an emitting layer or as a charge transport compound.
  • the organic electroluminescent device may contain an emitting layer, or it may contain a plurality of emitting layers, wherein at least one emitting layer contains at least one compound according to formula I or II, as defined above. If several emission layers are present, they preferably have a total of several emission maxima between 380 nm and 750 nm, so that overall white emission results, ie, in the emitting layers uses different emitting compounds that can fluoresce or phosphoresce. Particular preference is given to three-layer systems, the three layers exhibiting blue, green and orange or red emission (for the basic structure see, for example, WO 05/011013).
  • the compound according to formula I or II When the compound according to formula I or II is used as the emitting compound in an emitting layer, it is preferably used in combination with one or more compounds acting as a matrix.
  • the mixture of the compound according to formula I or II and the matrix material in these cases contains between 1 and 99% by weight, preferably between 2 and 90% by weight, more preferably between 3 and 40% by weight, in particular between 5 and 15 wt .-% of the compound according to formula I or II based on the total mixture of emitter and matrix material.
  • the mixture contains between 99 and 1 wt .-%, preferably between 98 and 10 wt .-%, particularly preferably between 97 and 60 wt .-%, in particular between 95 and 85 wt .-% of the matrix material based on the total mixture of Emitter and matrix material.
  • Preferred matrix materials are aromatic ketones, aromatic phosphine oxides or aromatic sulfoxides or sulfones, e.g. B. according to WO 04/013080, WO 04/093207, WO 06/005627 or the non-disclosed application DE 102008033943.1, triarylamines, carbazole derivatives, z. B. CBP (N, N-Biscarbazolylbiphenyl) or in WO 05/039246, US 2005/0069729, JP 2004/288381, EP 1205527 or
  • WO 08/086851 disclosed carbazole derivatives, indolocarbazole derivatives, e.g. B. according to WO 07/063754 or WO 08/056746, Azacarbazolderivate, z. B. according to EP 1617710, EP 1617711, EP 1731584, JP 2005/347160, bipolar matrix materials, for. B. according to WO 07/137725, silanes, z. B. according to WO 05/111172, azaborole or boronic esters, for. B. according to WO 06/117052, triazine derivatives, z. B.
  • an organic electroluminescent device wherein one or more layers are coated by a sublimation method.
  • organic electroluminescent device characterized in that one or more layers with the
  • OVPD Organic Vapor Phase Deposition
  • carrier gas sublimation 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.
  • screen printing flexographic printing or offset printing, but more preferably LITI (Light Induced Thermal Imaging, thermal transfer printing) or inkjet printing (ink jet printing) are produced.
  • LITI Light Induced Thermal Imaging, thermal transfer printing
  • inkjet printing ink jet printing
  • soluble compounds are necessary, which are optionally obtained by suitable substitution.
  • Another object of the invention are therefore oligomers, polymers or dendrimers containing one or more compounds of formula I or II, as defined above, wherein one or more bonds of the compounds of formula I or II to the polymer, oligomer or
  • Dendrimer are present. Depending on the linkage of the compound according to formula I or II, the complex therefore forms a side chain of the oligomer or polymer or is linked in the main chain.
  • the polymers, oligomers or dendrimers may be conjugated, partially conjugated or non-conjugated.
  • the oligomers or polymers may be linear, branched or dendritic.
  • the functionalized compounds of the formulas I or II are homopolymerized or copolymerized with further monomers.
  • Preferred are copolymers, wherein the
  • Suitable and preferred comonomers which form the polymer backbone are selected from fluorenes (eg according to EP 842208 or WO 00/22026), spirobifluorenes (for example according to EP 707020, EP 894107 or US Pat
  • WO 06/061181 para-phenylenes (for example according to WO 92/18552), carbazoles (for example according to WO 04/070772 or WO 04/113468), thiophenes (for example according to EP 1028136), Dihydrophenanthrenes (eg according to WO 05/014689), cis- and trans-indenofluorenes (eg according to WO 04/041901 or WO 04/113412), ketones (for example according to US Pat
  • WO 05/040302 phenanthrenes (for example according to WO 05/104264 or WO 07/017066) or else several of these units.
  • the proportion of these units in total is preferably in the range of at least 50 mol%.
  • the polymers, oligomers and dendrimers may also contain other units, for example hole transport units, in particular those based on triarylamines, and / or electron transport units.
  • Polymers containing compounds of general formula I or II can be used for the production of PLEDs, in particular as emitter layer in PLEDs.
  • the production of a polymeric emitter layer can be achieved, for example, by coating from solution (spin-coating or
  • the compounds according to the invention have a high thermal stability.
  • Organic electroluminescent devices containing compounds according to formula I or II as emitting materials have an excellent lifetime.
  • Blue, red and green phosphorescent complexes are available which have an efficient deep blue, red or even green emission color and have a long lifetime when used in organic electroluminescent devices. This is a significant advance over the prior art as previously blue, red and green phosphorescent devices were often accessible with poor color coordinates and, in particular, poor life.
  • the compounds according to the invention, used in organic electroluminescent devices lead to high efficiencies and steep current-voltage curves at low threshold voltages.
  • the ligand synthesis is carried out using azeotropic distillation to carry out the water formed.
  • a solution of 20 g (120 mmol) of 2-biphenylamine in 50 ml of dried toluene and a solution of 21.9 g (120 mmol) of 6-phenylpyridine-2-carboxaldehyde in 50 ml of toluene are slowly added dropwise.
  • the mixture is treated with catalytic amounts of p-toluenesulfonic acid.
  • the ligand synthesis is carried out using azeotropic distillation to carry out the water formed.
  • 300 ml of dried toluene are heated to boiling in a distillation apparatus in a 500 ml three-necked flask with stirrer, internal thermometer and dropping funnel.
  • a solution of 20 g (120 mmol) 2-biphenylamine in 50 ml of dried toluene and a solution of 21.9 g (120 mmol) of 3-pyridin-2-yl-benzaldehyde in 50 ml of toluene was added dropwise slowly.
  • the mixture is treated with catalytic amounts of p-toluenesulfonic acid.
  • the ligand synthesis is carried out using azeotropic distillation to carry out the water formed.
  • Electroluminescent devices according to the invention can be prepared as described, for example, in WO 05/003253. Here the results of different OLEDs are compared.
  • the basic structure, the materials used, the degree of doping and their layer thicknesses are identical for better comparability.
  • the first device example describes a comparison standard according to the prior art in which the emission layer consists of the host material spiro-ketone and the guest material (dopant) Ir (piq) 3 or a compound according to the invention.
  • OLEDs of various constructions are described, in each case the host material is spiro ketone.
  • OLEDs are produced with the following structure:
  • Hole injection layer 20 nm 2.2 I , 7,7'-tetrakis (di-para-tolylamino) spiro-9,9'-bifluorene
  • HTL Hole transport layer 20 nm NPB (N-naphthyl-N-phenyl-4,4 1 -diaminobiphenyl)
  • Emission layer 40 nm
  • Host spiro-ketone (SK) (bis (9,9 '- spirobifluorene-2-yl) ketone)
  • dopant Ir (piq) 3 (10% doping, vapor-deposited; synthesized according to WO 03/0068526 ) or compounds of the invention
  • OLEDs are characterized by default; For this purpose, the electroluminescence spectra, the efficiency (measured in cd / A) as a function of the brightness, calculated from current-voltage-brightness characteristics (IUL characteristics), and the lifetime are determined.
  • Table 2 summarizes the results of the device measurement.
  • the electroluminescent devices comprising the compounds according to the invention show an increased lifetime with improved efficiency.
  • Table 2 Device results with spiro-ketone as host material and with lr (piq) 3 or compounds according to the invention as dopant

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electroluminescent Light Sources (AREA)
  • Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
EP09736572A 2008-11-13 2009-10-15 Materialien für organische elektrolumineszenzvorrichtungen Withdrawn EP2344608A1 (de)

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CN102076816A (zh) 2011-05-25
DE102008057050B4 (de) 2021-06-02
TW201024311A (en) 2010-07-01
WO2010054731A1 (de) 2010-05-20
US8597798B2 (en) 2013-12-03
DE102008057050A1 (de) 2010-05-20
KR20110095130A (ko) 2011-08-24
KR101704825B1 (ko) 2017-02-08
JP5774487B2 (ja) 2015-09-09
US20110095281A1 (en) 2011-04-28
CN102076816B (zh) 2014-10-22

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