EP4229064A1 - Composés hétérocycliques pour dispositifs électroluminescents organiques - Google Patents

Composés hétérocycliques pour dispositifs électroluminescents organiques

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Publication number
EP4229064A1
EP4229064A1 EP21786986.6A EP21786986A EP4229064A1 EP 4229064 A1 EP4229064 A1 EP 4229064A1 EP 21786986 A EP21786986 A EP 21786986A EP 4229064 A1 EP4229064 A1 EP 4229064A1
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Prior art keywords
radicals
group
groups
occurrence
substituted
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German (de)
English (en)
Inventor
Philipp Stoessel
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Merck Patent GmbH
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Merck Patent GmbH
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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
    • C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
    • C07F5/02—Boron compounds
    • C07F5/027—Organoboranes and organoborohydrides
    • 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
    • H10K85/658—Organoboranes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/12—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains three hetero rings
    • C07D487/14—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D491/00—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
    • C07D491/12—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains three hetero rings
    • C07D491/14—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
    • C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
    • C07D495/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D498/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
    • C07D498/04—Ortho-condensed systems
    • 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
    • C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
    • C07F5/02—Boron compounds
    • 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
    • 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
    • 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
    • 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
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • 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

Definitions

  • the present invention relates to heterocyclic compounds for use in electronic devices, in particular in organic electroluminescent devices, and electronic devices, in particular organic electroluminescent devices, containing these heterocyclic compounds.
  • heterocyclic compounds for example for use as an emitter, in particular as a fluorescent emitter, particularly with regard to the service life, the color purity, but also with regard to the efficiency and the operating voltage of the device.
  • the object of the present invention is therefore to provide compounds which are suitable for use in an organic electronic device, in particular in an organic electroluminescent device, and which lead to good device properties when used in this device, and to provide the corresponding electronic device .
  • the compounds should have excellent processability, and the compounds should in particular have good solubility.
  • a further object of the present invention can be seen as providing compounds which are suitable for use in a phosphorescent or fluorescent electroluminescent device, in particular as an emitter.
  • the compounds should lead to devices which have excellent color purity, particularly when they are used as emitters in organic electroluminescent devices.
  • a further object of the present invention can be seen as providing compounds which are suitable for use in a phosphorescent or fluorescent electroluminescent device, in particular as a matrix material.
  • the compounds particularly when used as matrix materials, as hole-transport materials or as electron-transport materials in organic electroluminescent devices, should lead to devices which have excellent color purity.
  • a further object can be seen in providing electronic devices with excellent performance as cost-effectively as possible and with constant quality Furthermore, the electronic devices should be able to be used or adapted for many purposes. In particular, the performance of the electronic devices should be maintained over a wide temperature range.
  • the subject matter of the present invention is a compound comprising at least one structure of the formula (I), preferably a compound according to the formula (I), where the following applies to the symbols and indices used:
  • Z 1 is, identically or differently, N or B on each occurrence;
  • Ar a is identical or different on each occurrence, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which can be substituted by one or more radicals R, where the group Ar a with X 3 , X 5 or another group can be a ring system form;
  • Ar b is identical or different on each occurrence and is an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which can be substituted by one or more R radicals, where the Ar b group with X 2 , X 4 or another group can be a ring system form;
  • X 1 is identical or different on each occurrence for N or CR a , preferably for CR a with the proviso that not more than two of the groups X 1 , X 2 , X 3 in a cycle are N;
  • X 2 is identical or different on each occurrence for N or CR b , preferably for CR b with the proviso that not more than two of the groups X 1 , X 2 , X 3 in a cycle are N;
  • X 5 is identical or different on each occurrence for N or CR e , preferably for N;
  • R 2 is selected identically or differently on each occurrence from the group consisting of H, D, F, CN, an aliphatic hydrocarbon radical having 1 to 20 carbon atoms or an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, in which one or more H atoms can be replaced by D, F, CI, Br, I or CN and which can be substituted by one or more alkyl groups each having 1 to 4 carbon atoms, two or more, preferably adjacent Substituents R 2 together form a ring system.
  • An aryl group within the meaning of this invention contains 6 to 40 carbon atoms; a heteroaryl group within the meaning of this invention contains 2 to 40 carbon atoms and at least one heteroatom, with the proviso that the sum of carbon atoms and heteroatoms is at least 5.
  • the heteroatoms are preferably selected from N, O and/or S.
  • An aryl group or heteroaryl group is either a simple aromatic cycle, i.e. benzene, or a simple heteroaromatic cycle, for example pyridine, pyrimidine, thiophene, etc. or a fused (fused) aryl or heteroaryl group, for example naphthalene, anthracene, phenanthrene, quinoline, isoquinoline, etc.
  • aromatics linked to one another by a single bond, such as biphenyl are not referred to as aryl or heteroaryl groups, but as aromatic ring systems.
  • An electron-deficient heteroaryl group in the context of the present invention is a heteroaryl group which has at least one heteroaromatic six-membered ring with at least one nitrogen atom. Further aromatic or heteroaromatic five-membered rings or six-membered rings can be fused onto this six-membered ring. Examples of electron-deficient heteroaryl groups are pyridine, pyrimidine, pyrazine, pyridazine, triazine, quinoline, quinazoline or quinoxaline.
  • An aromatic ring system within the meaning of this invention contains 6 to 60 carbon atoms in the ring system, preferably 6 to 40 carbon atoms in the ring system.
  • a heteroaromatic ring system within the meaning of this invention contains 2 to 60 carbon atoms, preferably 3 to 40 carbon atoms, and at least one heteroatom in the ring system, with the proviso that the sum of carbon atoms and heteroatoms is at least 5.
  • the heteroatoms are preferably selected from N, O and/or S.
  • An aromatic or heteroaromatic ring system in the context of this invention is to be understood as meaning a system which does not necessarily only contain aryl or heteroaryl groups, but also in which several aryl or heteroaryl groups a non-aromatic moiety such as B. a C, N or O atom may be connected.
  • systems such as fluorene, 9,9'-spirobifluorene, 9,9-diarylfluorene, triarylamine, diaryl ether, stilbene, etc. should also be understood as aromatic ring systems for the purposes of this invention, and also systems in which two or more aryl groups, for example connected by a short alkyl group.
  • the aromatic ring system is preferably selected from fluorene, 9,9'-spirobifluorene, 9,9-diarylamine or groups in which two or more aryl and/or heteroaryl groups are linked to one another by single bonds.
  • an aliphatic hydrocarbon radical or an alkyl group or an alkenyl or alkynyl group which can contain 1 to 20 carbon atoms, and in which individual H atoms or CH 2 groups are also substituted by the abovementioned groups can be, preferably the radicals methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, 2-methylbutyl, n-pentyl, s-pentyl, neo-pentyl, cyclopentyl, n-hexyl, neo-hexyl, cyclohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, trifluoromethyl, pentafluoroethyl
  • An alkoxy group having 1 to 40 carbon atoms is preferably 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.
  • a thioalkyl group with 1 to 40 carbon atoms is, in particular, methylthio, ethylthio, n-propylthio, i-propylthio, n-butylthio,
  • alkyl, alkoxy or thioalkyl groups can be straight-chain, branched or cyclic, it being possible for one or more non-adjacent CH2 groups to be replaced by the groups mentioned above; furthermore, one or more H atoms can also be replaced by D, F, Cl, Br, I, CN or NO 2 , preferably F, Cl or CN, more preferably F or CN, particularly preferably CN.
  • aromatic or heteroaromatic ring system with 5-60 or 5 to 40 aromatic ring atoms which can be substituted with the abovementioned radicals and which can be linked via any position on the aromatic or heteroaromatic, is understood to mean, in particular, groups derived from benzene, naphthalene, anthracene, benzanthracene, phenanthrene, pyrene, chrysene, perylene, fluoranthene, naphthacene, pentacene, benzopyrene, biphenyl, biphenylene, terphenyl, triphenylene, fluorene, spirobifluorene, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis- or trans-indeno-fluorene, cis- or trans-indenocarbazole, cis- or trans-indolocarbazole, truxene, isotruxen
  • at least one group X 3 forms a ring system with another group, which is preferably selected from X 4 or W 1 , with p preferably being 1 and/or the group X 3 with the group W 1 forms a ring system.
  • the compounds according to the invention can comprise a structure of the formulas (IIa) to (IIc), the compounds according to the invention can particularly preferably be selected from the compounds of the formulas (IIa) to (IIc), where W 1 , Z 1 , X 1 , X 2 , X 3 , X 4 and X 5 have the meanings given above, in particular for formula (I), and the following applies to the other symbols and indices:
  • W 2 , W 3 is the same or different for X 6 on each occurrence, or the two radicals W 2 , W 3 together form a group Ar a , the group Ar a formed by the two radicals W 2 , W 3 being in the ortho position is linked to the other radicals Z 2 , Y 1 , where Ar a is as defined in claim 1;
  • Z 2 is, identically or differently, N or B on each occurrence;
  • Ar c is identical or different on each occurrence and is an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms which is substituted by one or more R radicals can, in this case the group Ar c can form a ring system with X 2 or another group;
  • X 6 is identical or different on each occurrence for N or CR f , preferably for CR f ;
  • the group Z 1 is N and the group W 1 is selected from N(Ar a ), N(R) and the group Y, Y 2 represents N(Ar a ), N(R), P(Ar a ), P(R), O, S or Se, preferably represents N(Ar a ), N(R), 0 or S, particularly preferably stands for N(Ar a ).
  • the group Z 1 is N and the group W 1 is selected from B(Ar a ), B(R) and the group Y , Y 2 is N(Ar b ), N(R), P(Ar b ), P(R), O, S or Se, preferably N(Ar b ), N(R), O or S , particularly preferably N(Ar b ).
  • the group Z 1 is B and the group W 1 is selected from N(Ar a ), N(R) and the group Y, Y 2 represents N(Ar a ), N(R), P(Ar a ), P(R), O, S or Se, preferably represents N(Ar a ), N(R), 0 or S, particularly preferably stands for N(Ar a ).
  • the group Z 1 is B and the group W 1 is selected from B(Ar a ), B(R) and the group Y , Y 2 is N(Ar b ), N(R), P(Ar b ), P(R), O, S or Se, preferably N(Ar b ), N(R), O or S , particularly preferably N(Ar b ).
  • the compounds according to the invention comprise a structure of the formulas (III-1) to (III-26), in which case the compounds according to the invention can particularly preferably be selected from the compounds of the formulas (III-1) to (III-26), where the symbols W 1 , Z 1 , X 1 , X 2 , X 3 , X 4 and X 5 have the meanings mentioned above, in particular for formula (I), the symbols Z 2 , Y 1 , Y 2 , X 6 have the have the meanings mentioned above, in particular for formulas (IIa) to (IIc), and the following applies to the other symbols and indices:
  • Z 3 , Z 4 is, identically or differently, N or B on each occurrence;
  • the compounds according to the invention comprise a structure of the formulas (IV-1) to (IV-10), where the compounds according to the invention can particularly preferably be selected from the compounds of the formulas (IV-1) to (IV-10),
  • the symbols W 1 , Z 1 , R a , R b , R c , R d and R e have the meanings given above, in particular for formula (I), the symbols Z 2 , W 2 , W 3 , Y 1 , Y 2 has the meanings mentioned above, in particular for formula (IIa) to (IIc), the index m is 0, 1, 2, 3 or 4, preferably 0, 1 or 2, the index n is 0, 1, 2 or 3 , preferably 0, 1 or 2 and the index j is 0, 1 or 2, preferably 0 or 1.
  • the compounds particularly preferably include at least one structure of the formulas (V-1) to (V-52), particularly preferably the compounds are selected from compounds of the formulas (V-1) to (V-52),
  • Structures/compounds of the formulas (V-1) to (V-26) are preferred here.
  • the sum of the indices j, m, n and I in structures/compounds of the formulas (IV-1) to (IV-10) and/or (V-1) to (V-52) is preferably at most 8, particularly preferably at most 6 and particularly preferably at most 4.
  • At least one, preferably two, of the groups Z 1 and Z 2 is/are N and at least one, preferably two of the groups Y 1 , Y 2 are N(Ar c ), N (R), P(Ar c ), P(R), O, S or Se or N(Ar b ), N(R), P(Ar b ), P(R), O, S or Se / stand, preferably stands for N(Ar b ), N(Ar c ), N(R), 0 or S, particularly preferably stands for N(Ar b ), N(Ar c ).
  • Embodiments in which at least one, preferably two of the groups Z 1 , Z 2 are N and at least one, preferably two of the groups Y 1 , Y 2 are N(Ar b ), N(Ar c ), N(R), P (Ar b ), P(Ar c ), P(R), O, S or Se can be used advantageously, in particular, as a hole conductor material.
  • Configurations in which at least one of the groups Z 1 and Z 2 is B and at least one, preferably two groups Y 1 , Y 2 are N(Ar b ), N(Ar c ), N(R), P(Ar b ), P(Ar c ), P(R), O, S or Se can be used to advantage as emitters.
  • At least one, preferably two, of the groups Z 1 and Z 2 is/are N and at least one, preferably two of the groups Z 3 and Z 4 is/are B.
  • Configurations in which at least one, preferably two, of the groups Z 1 and Z 2 is/are N, and at least one, preferably two, of the groups Z 3 and Z 4 is/are B, can advantageously be used as emitters.
  • Embodiments in which many, preferably all, of the groups Z 1 , Z 2 , Z 3 , Z 4 are N can be used to advantage, in particular as hole conductor material.
  • Configurations in which at least one, preferably two, of the groups Z 1 and Z 2 is/are B, and at least one, preferably two of the groups Z 3 and Z 4 is/are N, can advantageously be used as emitters.
  • At least two radicals R, R a , R b , R c , R d , R e , R f are connected to the other groups to which the two radicals R, R a , R b , R c , R d , R e , R f form a fused ring, where the two radicals R, R a , R b , R c , R d , R e , R f form at least one structure of the formulas (RA -1 ) to (RA-12) shapes where R 1 has the meaning set out above, the dashed bonds represent the attachment points via which the two radicals R, R a , R b , R c , R d , R e , R f bond, and the other symbols have the following meaning :
  • the at least two radicals R, Ra , Rb , Rc , Rd , Re , Rf form with the further groups to which the two radicals R, Ra , Rb , Rc , R d , R e , R f bind a fused ring, wherein the two radicals R, R a , R b , R c , R d , R e , R f preferably have at least one of the structures of the formulas (RA-1 a ) to (RA-4f).
  • radicals R, R a , R b , R c , R d , R e , R f the structures of the formulas (RA-1) to (RA-12) and/or (RA -1 a) to (RA-4f) and form a fused ring
  • radicals R, R a , R b , R c , R d , R e , R f from adjacent groups X 1 , X 2 , X 3 , X 4 , X 5 , X 6 represent or represent radicals R which each bond to adjacent carbon atoms, these carbon atoms preferably being connected via a bond.
  • At least two radicals R, Ra , Rb, Rc , Rd , Re , Rf form with the other groups to which the two radicals R, Ra , Rb , Rc , R d , R e , R f bond, a fused ring with the two groups R, R a , R b , R c , R d , R e , R f forming structures of formula (RB).
  • R 1 has the meaning mentioned above, in particular for formula (I)
  • the dashed bonds represent the attachment points via which the two radicals R, R a , R b , R c , R d , R e , R f bind
  • the Index m is 0, 1, 2, 3 or 4, preferably 0, 1 or 2
  • Y 5 is C(R 1 ) 2 , NR 1 , NAr', BR 1 , BAr', O or S, preferably C( R 1 ) 2 , NAr' or O, where Ar' has the meaning given above, in particular for formula (I).
  • radicals R, R a , R b , R c , R d , R e , R f form the structures of the formula (RB) and form a fused ring
  • radicals R, R a , R b , R c , R d , R e , R f from adjacent groups X 1 , X 2 , X 3 , X 4 , X 5 , X 6 represent or radicals R represent each of which binds to adjacent carbon atoms, these carbon atoms preferably being connected to one another via a bond.
  • the compounds particularly preferably comprise at least one structure of the formulas (VI-1) to (VI-60), particularly preferably the
  • the compounds particularly preferably include at least one structure of the formulas (VII-1) to (VII-32), particularly preferably the compounds are selected from compounds of the formulas (VII-1) to (VII-32), the compounds condensing at least one have a ring where the symbols Z 1 , R a , R b , R c , R d and R e have the meanings given above, in particular for formula (I), the symbols Z 2 , Y 1 , Y 2 , R f have the meanings given above, in particular have the meanings mentioned for formula (IIa) to (IIc), the symbol o stands for the attachment points of the fused ring and the other symbols have the following meanings:
  • the fused ring in particular in formulas (VI-1) to (VI-60) and/or (VII-1) to (VII-50), is preferably substituted by at least two radicals R, R a , R b , R c , R d , R e , R f and the other groups to which the two radicals R, R a , R b , R c , R d , Re , R f bind , wherein the at least two radicals R, R a , R b , R c , R d , R e , R f Structures of the formulas (RA-1) to (RA-12), (RA-1a) to (RA-4f) and/or the formula (RB) form, preferably structures of the formulas (RA-1) to (RA-12) and / or (RA-1a) to (RA-4f).
  • the sum of the indices k, j, I, m and n is preferably 0, 1, 2 or 3, particularly preferably 1 or 2.
  • the substituents R, R a , R b , R c , R d , R e , R f , R g , R 1 and R 2 according to the above formulas with the ring atoms of the ring system to which the substituents R , R a , R b , R c , R d , R e , R f , R g , R 1 and R 2 bond, do not form a fused aromatic or heteroaromatic ring system.
  • radicals which can be selected in particular from R, R a , R b , R c , R d , R e , R f , R g , R 1 and R 2 , form a ring system with one another, this can be mono- or be polycyclic, aliphatic, heteroaliphatic, aromatic or heteroaromatic.
  • the radicals which form a ring system with one another can be adjacent, ie these radicals are attached to the same carbon atom or to carbon atoms which are bonded directly to one another, or they can be further apart.
  • each of the corresponding binding sites is preferably provided with a substituent R, R a , R b , R c , R d , R e , R f , R g , R 1 and/or R 2 .
  • a compound according to the invention is characterized by at least one of the structures of the formula (I), (IIa) to (Ile), (III-1) to (III-26), (IV-1) to (IV-10) , (V-1) to (V-52), (VI-1) to (VI-60) and/or (VII-1) to (VII-32) can be displayed.
  • compounds according to the invention preferably comprising structures of the formula (I), (IIa) to (lie), (III-1) to (III-26), (IV-1) to (IV-10), (V-1 ) to (V-52), (VI-1) to (VI-60) and/or (VII-1) to (VII-32) has a molecular weight of less than or equal to 5000 g/mol, preferably less than or equal to 4000 g / mol, particularly preferably less than or equal to 3000 g/mol, especially preferably less than or equal to 2000 g/mol and very particularly preferably less than or equal to 1200 g/mol.
  • preferred compounds according to the invention are characterized in that they can be sublimated. These compounds generally have a molecular weight of less than about 1200 g/mol.
  • Preferred aromatic or heteroaromatic ring systems R, R a , R b , R c , R d , R e , R f , Ar' and/or Ar a , Ar b , Arc c are selected from phenyl, biphenyl, in particular ortho-, meta- or para-biphenyl, terphenyl, in particular ortho-, meta-, para- or branched terphenyl, quaterphenyl, in particular ortho-, meta-, para- or branched quaterphenyl, fluorene, which via the 1-, 2-, 3- or 4-position can be linked, spirobifluorene, which can be linked via the 1-, 2-, 3- or 4-position, naphthalene, in particular 1-or- linked naphthalene, indole, benzofuran, benzothiophene, carbazole, which via the 1-, 2-, 3-, 4- or 9-position can be linked, dibenzofuran,
  • Ar 1 is identical or different on each occurrence and is a divalent aromatic or heteroaromatic ring system having 6 to 18 aromatic ring atoms, which can be substituted by one or more R 1 radicals;
  • the groups mentioned above have several groups A for Ar, then all combinations from the definition of A are suitable for this. Preferred embodiments are then those in which one group A is NR 1 and the other group A is C(R 1 ) 2 or in which both groups A are NR 1 or in which both groups A are O. If A is NR 1 , the substituent R 1 which is bonded to the nitrogen atom is preferably an aromatic or heteroaromatic ring system having 5 to 24 aromatic ring atoms, which can also be substituted by one or more R 2 radicals.
  • this substituent R 1 is identical or different on each occurrence for an aromatic or heteroaromatic ring system with 6 to 24 aromatic ring atoms, in particular with 6 to 18 aromatic ring atoms, which has no fused aryl groups and which no fused heteroaryl groups in which two or more aromatic or heteroaromatic 6-ring groups are fused directly to one another, and which can each also be substituted by one or more radicals R 2 .
  • Triazine, pyrimidine and quinazoline are also preferred, as listed above for Ar-47 to Ar-50, Ar-57 and Ar-58, it being possible for these structures to be substituted by one or more R 2 radicals instead of by R 1 .
  • R, R a , R b , R c , R d , R e , R f is the same or different on each occurrence selected from the group consisting of H, D, F, CN, NO 2 , Si (R 1 ) 3 , B(OR 1 ) 2 , a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, the alkyl group in each case having one or more radicals R 1 may be substituted, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, preferably atoms having 5 to 40 aromatic ring atoms, each of which may be substituted by one or more R 1 radicals.
  • the substituent R, R a , R b , R c , R d , R e , R f is the same or different on each occurrence selected from the group consisting of H, D, F, a straight-chain Alkyl group with 1 to 20 carbon atoms or a branched or cyclic alkyl group with 3 to 20 carbon atoms, where the alkyl group can be substituted with one or more radicals R 1 , or an aromatic or heteroaromatic ring system with 5 to 60 aromatic ring atoms, preferably with 5 to 40 aromatic ring atoms, each of which can be substituted by one or more radicals R 1 .
  • At least one substituent R, R a , R b , R c , R d , R e , R f is selected identically or differently on each occurrence from the group consisting of H, D, an aromatic or heteroaromatic ring system with 6 to 30 aromatic ring atoms, which can be substituted by one or more radicals R 1 , or a group N(Ar') 2 .
  • the substituents R, R a , R b , R c , R d , R e , R f either form a ring according to the structures of the formulas (RA-1) to (RA-12), ( RA-1 a) to (RA-4f) or (RB) or R, R a , R b , R c , R d , R e , R f is the same or different on each occurrence selected from the group consisting of H, D, an aromatic or heteroaromatic ring system having 6 to 30 aromatic ring atoms, which can be substituted by one or more radicals R 1 , or a group N(Ar') 2 .
  • Substituents R, R a , R b , R c , R d , R e , R f are particularly preferably identical or different on each occurrence and are selected from the group consisting of H or an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms , preferably having 6 to 18 aromatic ring atoms, particularly preferably having 6 to 13 aromatic ring atoms, which may each be substituted by one or more R 1 radicals.
  • R g is selected identically or differently on each occurrence from the group consisting of a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl group each be substituted with one or more R 2 groups or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, preferably having 5 to 40 aromatic ring atoms, which can each be substituted by one or more R 2 radicals.
  • R g is the same or different on each occurrence selected from the group consisting of a straight-chain alkyl group having 1 to 10 carbon atoms or a branched or cyclic alkyl group having 3 to 10 carbon atoms, the alkyl group in each case may be substituted with one or more R 2 radicals, an aromatic or heteroaromatic ring system having 6 to 30 aromatic ring atoms, which may be substituted with one or more R 2 radicals.
  • R a is particularly preferably the same or different on each occurrence selected from the group consisting of a straight-chain alkyl group having 1 to 5 carbon atoms or a branched or cyclic alkyl group having 3 to 5 carbon atoms, the alkyl group in each case having one or more radicals R 2 can be substituted or an aromatic or heteroaromatic ring system with 6 to 24 aromatic ring atoms, preferably with 6 to 18 aromatic ring atoms, particularly preferably with 6 to 13 aromatic ring atoms, which can each be substituted with one or more R 2 radicals can.
  • R g is selected identically or differently on each occurrence from the group consisting of a straight-chain alkyl group having 1 to 6 carbon atoms or a cyclic alkyl group having 3 to 6 carbon atoms, the alkyl group in each case having one or more radicals R 2 may be substituted, or an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, each of which may be substituted by one or more radicals R 2 ; two radicals R g can also form a ring system with one another.
  • R g is particularly preferably selected identically or differently on each occurrence from the group consisting of a straight-chain alkyl group having 1, 2, 3 or 4 carbon atoms or a branched or cyclic alkyl group having 3 to 6 carbon atoms, where the alkyl group each be substituted with one or more R 2 groups can, but is preferably unsubstituted, or an aromatic ring system having 6 to 12 aromatic ring atoms, in particular having 6 aromatic ring atoms, which may be substituted by one or more, preferably non-aromatic radicals R 2 , but is preferably unsubstituted ; two radicals R g can form a ring system with one another.
  • R g is very particularly preferably selected the same or differently on each occurrence from the group consisting of a straight-chain alkyl group having 1, 2, 3 or 4 carbon atoms, or a branched alkyl group having 3 to 6 carbon atoms.
  • R g is very particularly preferably a methyl group or a phenyl group, it being possible for two phenyl groups to form a ring system together, with a methyl group being preferred to a phenyl group.
  • Substituents R, R a , R b , R c , R d , R e , R f , R g or Ar a , Ar b , Arc or Ar′ are selected from phenyl, biphenyl, in particular ortho -, meta- or para-biphenyl, terphenyl, in particular ortho-, meta-, para- or branched terphenyl, quaterphenyl, in particular ortho-, meta-, para- or branched quaterphenyl, fluorene, which via the 1-, 2 -, 3- or 4-position can be linked, spirobifluorene, which can be linked via the 1-, 2-, 3- or 4-position, naphthalene, in particular 1- or - linked naphthalene, indole, benzofuran, benzothiophene, carbazole , which can be linked via the 1-, 2-, 3- or 4-position
  • the structures Ar-1 to Ar-75 listed above are particularly preferred, with structures of the formulas (Ar-1), (Ar-2), (Ar-3), (Ar-12), (Ar-13), ( Ar-14), (Ar-15), (Ar-16), (Ar-69), (Ar-70), (Ar-75), preferably and structures of the formulas (Ar-1), (Ar-2 ), (Ar-3), (Ar-12), (Ar-13), (Ar-14), (Ar-15), (Ar-16) are particularly preferred.
  • Ar-1 to Ar-75 it should be noted that these are represented with a substituent R 1 . in the In the case of the ring systems Ar a , Ar b , Arc c these substituents R 1 are to be replaced by R and in the case of R g these substituents R 1 are to be replaced by R 2 .
  • R, R a , R b , R c , R d , Re , R f are groups of the formula -Ar 4 -N(Ar 2 )(Ar 3 ), where Ar 2 , Ar 3 and Ar 4 are the same or different on each occurrence are an aromatic or heteroaromatic ring system having 5 to 24 aromatic ring atoms, which can each be substituted by one or more R 1 radicals.
  • the total number of aromatic ring atoms of Ar 2 , Ar 3 and Ar 4 is at most 60 and preferably at most 40.
  • Ar 4 and Ar 2 can be connected to one another and/or Ar 2 and Ar 3 can also be connected to one another via a group selected from C(R 1 ) 2 , NR 1 , O or S.
  • Ar 4 and Ar 2 are preferably linked to one another or Ar 2 and Ar 3 to one another in each case ortho to the position of the linkage to the nitrogen atom.
  • none of the groups Ar 2 , Ar 3 or Ar 4 are connected to one another.
  • Ar 4 is preferably an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, preferably having 6 to 12 aromatic ring atoms, which can each be substituted by one or more R 1 radicals.
  • Ar 4 is particularly preferably selected from the group consisting of ortho-, meta- or para-phenylene or ortho-, meta- or para-biphenyl, which can each be substituted by one or more radicals R 1 , but are preferably unsubstituted. Most preferably Ar 4 is an unsubstituted phenylene group.
  • Ar 2 and Ar 3 are preferably identical or different on each occurrence and are an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, which can each be substituted by one or more R 1 radicals.
  • Particularly preferred Ar 2 and Ar 3 groups are identical or different on each occurrence and are selected from the group consisting of benzene, ortho-, meta- or para-biphenyl, ortho-, meta-, para- or branched terphenyl, ortho-, meta -, para- or branched quaterphenyl, 1-, 2-, 3- or 4-fluorenyl, 1-, 2-, 3- or 4-spirobifluorenyl, 1- or 2-naphthyl, indole, benzofuran, benzothiophene , 1-, 2- 3- or 4-carbazole, 1-, 2-, 3- or 4-dibenzofuran, 1-, 2-, 3- or 4-dibenzothiophene, indenocarbazole, indolocarbazole, 2-,
  • Ar 2 and Ar 3 are very particularly preferably the same or different on each occurrence selected from the group consisting of benzene, biphenyl, in particular ortho-, meta- or para-biphenyl, terphenyl, in particular ortho-, meta-, para- or branched ter - phenyl, quaterphenyl, in particular ortho-, meta-, para- or branched quaterphenyl, fluorene, in particular 1-, 2-, 3- or 4-fluorene, or spirobifluorene, in particular 1-, 2-, 3- or 4- -spirobifluorene.
  • R 1 is identical or different on each occurrence selected from the group consisting of H, D, F, CN, a straight-chain alkyl group having 1 to 10 carbon atoms or a branched or cyclic alkyl group having 3 to 10 carbon atoms, it being possible for the alkyl group to be substituted by one or more R 2 radicals, or an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, each of which can be substituted by one or more R 2 radicals.
  • R 1 is identical or different on each occurrence selected from the group consisting of H, a straight-chain alkyl group having 1 to 6 carbon atoms, in particular having 1, 2, 3 or 4 carbon atoms, or a branched or cyclic alkyl group having 3 to 6 carbon atoms, where the alkyl group may be substituted by one or more radicals R 5 , but is preferably unsubstituted, or an aromatic or heteroaromatic ring system having 6 to 13 aromatic ring atoms, each of which is substituted by one or more radicals R 5 may be substituted, but is preferably unsubstituted.
  • R 2 is identical or different on each occurrence and is H, an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms which is substituted with an alkyl group having 1 to 4 carbon atoms may be, but is preferably unsubstituted.
  • the alkyl groups preferably have no more than five carbon atoms, particularly preferably no more than 4 carbon atoms, very particularly preferably no more than 1 carbon atom.
  • alkyl groups in particular branched alkyl groups, having up to 10 carbon atoms or which are substituted with oligoarylene groups, for example ortho-, meta-, para- or branched terphenyl - or quaterphenyl groups, are substituted.
  • the compound has exactly two or exactly three structures of the formula (I), (IIa) to (Ile), (III-1) to (III-26), (IV-1) to (IV-10 ), (V-1) to (V-52), (VI-1) to (VI-60) and/or (VII-1) to (VII-32), preferably one of the aromatic or heteroaromatic ring systems, to which at least one of the groups X 1 , X 2 , X 3 binds or which comprises at least one of the groups X 1 , X 2 , X 3 is shared by both structures.
  • the compounds are selected from compounds of the formula (D-1), (D-2). (D3) or (D-4),
  • group L 1 is a connecting group, preferably a bond or an aromatic or heteroaromatic ring system having 5 to 40, preferably 5 to 30 aromatic ring atoms, which can be substituted by one or more radicals R, preferably radicals R 1 , and the others used Symbols and indices have the meanings given above, in particular for formula (I) and/or formula (IIa) to (IIc).
  • L 1 is a bond or an aromatic or heteroaromatic ring system having 5 to 14 aromatic or heteroaromatic ring atoms, preferably an aromatic ring system having 6 to 12 carbon atoms, which can be substituted by one or more R 1 radicals , but is preferably unsubstituted, where R 1 can have the meaning given above, in particular for formula (I).
  • L 1 is particularly preferably an aromatic ring system having 6 to 10 aromatic ring atoms or a heteroaromatic ring system having 6 to 13 heteroaromatic ring atoms, each of which may be substituted by one or more radicals R 2 , but is preferably unsubstituted, where R 2 is the above, in particular for formula (I) can have the meaning mentioned.
  • the symbol L 1 set out in formula (D4) is the same or different on each occurrence for a bond or an aryl or heteroaryl radical having 5 to 24 ring atoms, preferably 6 to 13 ring atoms, particularly preferably 6 to 10 ring atoms, so that an aromatic or heteroaromatic group of an aromatic or heteroaromatic ring system is bonded directly, ie via an atom of the aromatic or heteroaromatic group, to the respective atom of the further group.
  • Suitable aromatic or heteroaromatic ring systems L 1 are selected from the group consisting of ortho-, meta- or para-phenylene, ortho-, meta- or para-biphenylene, terphenylene, in particular branched terphenylene, quaterphenylene, in particular branched quaterphenylene, fluorenylene, Spirobifluorenylene, dibenzofuranylene, dibenzothienylene and carbazolylene, each of which may be substituted by one or more radicals R 1 , but are preferably unsubstituted.
  • the compounds according to the invention can be prepared by various processes. However, the methods described below have proven to be particularly suitable.
  • a further subject of the present invention is therefore a method for preparing the compounds according to the invention, in which a basic structure with a group Z 1 or a group W 1 or a precursor of one of the groups Z 1 , W 1 is synthesized and at least one of the groups X 4 , X 5 is introduced by means of a nucleophilic aromatic substitution reaction or a coupling reaction.
  • Suitable compounds comprising a basic structure with a Z 1 group or a W 1 group can often be obtained commercially, the starting compounds set out in the examples being obtainable by known processes, so that reference is made thereto. These compounds can be reacted with other compounds by known coupling reactions, the necessary conditions for this being known to the person skilled in the art and detailed information in the examples assisting the person skilled in the art in carrying out these reactions.
  • Particularly suitable and preferred coupling reactions are those according to BUCHWALD, SUZUKI, YAMAMOTO, STILLE, HECK, NEGISHI, SONOGASHIRA and HIYAMA. These reactions are well known and the examples provide further guidance to those skilled in the art.
  • the compounds according to the invention can be obtained in high purity, preferably more than 99% (determined by means of 1 H-NMR and/or HPLC).
  • the compounds according to the invention can also be mixed with a polymer. It is also possible to covalently incorporate these compounds into a polymer. This is possible in particular with compounds which are substituted with reactive leaving groups such as bromine, iodine, chlorine, boronic acid or boronic esters, or with reactive, polymerizable groups such as olefins or oxetanes. These can be used as monomers to produce corresponding oligomers, dendrimers or polymers. The oligomerization or polymerization preferably takes place via the halogen functionality or the boronic acid functionality or via the polymerizable group. It is also possible to crosslink the polymers via such groups.
  • Compounds and polymers can be used as a crosslinked or uncrosslinked layer.
  • Another subject of the invention are therefore oligomers, polymers or dendrimers containing one or more of the above structures of the formula (I) and preferred embodiments of this formula or compounds according to the invention, wherein one or more bonds of the compounds according to the invention or the structures of the formula (I) and preferred embodiments of this formula for the polymer, oligomer or dendrimer are present.
  • these therefore form a side chain of the oligomer or polymer or are linked in the main chain.
  • the polymers, oligomers or dendrimers can be conjugated, partially conjugated or non-conjugated.
  • the oligomers or polymers can be linear, branched or dendritic. The same preferences as described above apply to the repeating units of the compounds according to the invention in oligomers, dendrimers and polymers.
  • the monomers according to the invention are homopolymerized or copolymerized with other monomers.
  • Copolymers are preferred in which the units of the formula (I) or the preferred embodiments described above and below are present in an amount of 0.01 to 99.9 mol %, preferably 5 to 90 mol %, particularly preferably 20 to 80 mol %.
  • Suitable and preferred comonomers which form the polymer backbone are selected from fluorenes (e.g. according to EP 842208 or WO 2000/022026), spirobifluorenes (e.g. according to EP 707020, EP 894107 or WO 2006/061181), para- phenylenes (e.g.
  • WO 92/18552 carbazoles (e.g. according to WO 2004/070772 or WO 2004/113468), thiophenes (e.g. according to EP 1028136), dihydrophenanthrenes (e.g. according to WO 2005/014689), cis- and trans-indenofluorenes (e.g. according to WO 2004/041901 or WO 2004/113412), ketones (e.g. according to WO 2005/040302), phenanthrenes (e.g. according to WO 2005 /104264 or WO 2007/017066) or several of these units.
  • the polymers, oligomers and dendrimers can also contain other units, for example wise hole transport units, in particular those based on triarylamines, and/or electron transport units.
  • compounds according to the invention which are distinguished by a high glass transition temperature are of particular interest.
  • compounds according to the invention comprising structures according to the formula (I) or the preferred embodiments described above and below, which have a glass transition temperature of at least 70° C., particularly preferably at least 110° C., very particularly preferably at least 125° C. and particularly preferably at least 150° C., determined according to DIN 51005 (version 2005-08).
  • Formulations of the compounds according to the invention are required for the processing of the compounds according to the invention from the liquid phase, for example by spin coating or by printing processes. These formulations can be, for example, solutions, dispersions or emulsions. It may be preferable to use mixtures of two or more solvents for this.
  • Suitable and preferred solvents are toluene, anisole, o-, m- or p-xylene, methyl benzoate, mesitylene, tetralin, veratrol, THF, methyl THF, THP, chlorobenzene, dioxane, phenoxytoluene, especially 3-phenoxytoluene , (-)-fenchone, 1,2,3,5-tetramethylbenzene, 1,2,4,5-tetramethylbenzene, 1-methylnaphthalene, 2-methylbenzothiazole, 2-phenoxyethanol, 2-pyrrolidinone, 3-methylanisole, 4 -Methylanisole, 3,4-dimethylanisole, 3,5-dimethylanisole, acetophenone, a-terpineol, benzothiazole, butyl benzoate, cumene, cyclohexanol, cyclohexanone, cyclohexylbenzene, decalin, do
  • a further object of the present invention is therefore a formulation or a composition containing at least one compound according to the invention and at least one further compound.
  • the further connection can be, for example, a solvent, in particular one of the abovementioned solvents or a mixture of these solvents. If the further compound comprises a solvent, then this mixture is referred to herein as a formulation.
  • the further compound can also be at least one further organic or inorganic compound which is also used in the electronic device, for example an emitter and/or a matrix material, these compounds differing from the compounds according to the invention. Suitable emitters and matrix materials are listed below in connection with the organic electroluminescent device.
  • the further connection can also be polymeric.
  • compositions containing a compound according to the invention and at least one further organically functional material.
  • Functional materials are generally the organic or inorganic materials that are placed between the anode and the cathode.
  • the organically functional material is preferably selected from the group consisting of fluorescent emitters, phosphorescent emitters, emitters that exhibit TADF (thermally activated delayed fluorescence), host materials, electron transport materials, electron injection materials, hole conductor materials, hole injection materials, electron blocking materials, hole blocking materials, wide-band gap materials and n-dopants.
  • Another object of the present invention is the use of a compound according to the invention in an electronic device, in particular in an organic electroluminescent device, preferably as an emitter, particularly preferably as a green, red or blue emitter.
  • compounds according to the invention preferably exhibit fluorescent properties and thus preferably provide fluorescent emitters.
  • compounds according to the invention can be used as host materials, electron transport materials and/or hole conductor materials.
  • compounds according to the invention in which many, preferably all, of the groups Z 1 , Z 2 , Z 3 , Z 4 represent N can advantageously be used as hole conductor materials.
  • compounds according to the invention in which many, preferably all, of the groups Z 1 , Z 2 , Z 3 , Z 4 represent B can advantageously be used as electron transport materials.
  • compounds according to the invention can be used as materials for the color conversion of light (for example as a PCC pixel color converter).
  • An electronic device containing at least one connection according to the invention.
  • An electronic device within the meaning of the present invention is a device which contains at least one layer which contains at least one organic compound.
  • the component can also contain inorganic materials or also layers which are made up entirely of inorganic materials.
  • the electronic device is preferably selected from the group consisting of The electronic device is particularly preferably selected from the group consisting of organic electroluminescent devices (OLEDs, sOLED, PLEDs, LECs, etc.), preferably organic light-emitting diodes (OLEDs), organic light small molecule-based emitting diodes (sOLEDs), organic polymer-based light-emitting diodes (PLEDs), light-emitting electrochemical cells (LECs), organic laser diodes (O-lasers), organic plasmon emitting devices (DM Koller et al., Nature Photonics 2008, 1-4); 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) and organic electrical sensors,
  • the organic electroluminescent device contains cathode, anode and at least one emitting layer. In addition to these layers, it can 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, electron-blocking layers and/or charge-generation layers. Likewise, interlayers can be introduced between two emitting layers, which have an exciton-blocking function, for example. However, it should be pointed out that each of these layers does not necessarily have to be present. In this case, the organic electroluminescent device can contain an emitting layer, or it can contain a plurality of emitting layers.
  • emission layers are present, these preferably have a total of several emission maxima between 380 nm and 750 nm, so that overall white emission results, i. H. in the emitting layers different emitting compounds are used which can fluoresce or phosphoresce. Systems with three emitting layers are particularly preferred, with the three layers showing blue, green and orange or red emission.
  • the organic electroluminescent device according to the invention can also be a tandem electroluminescent device, in particular for white-emitting OLEDs.
  • connection according to the invention can be used in different layers, depending on the exact structure. Preference is given to an organic electroluminescent device containing a compound of the formula (I) or the preferred embodiments listed above form in an emitting layer as an emitter, preferably red, green or blue emitter.
  • the compound according to the invention is used as an emitter in an emitting layer, preference is given to using a suitable matrix material which is known per se.
  • a preferred mixture of the compound according to the invention and a matrix material contains between 99 and 1% by volume, preferably between 98 and 10% by volume, particularly preferably between 97 and 60% by volume, in particular between 95 and 80% by volume of matrix material based on the total mixture of emitter and matrix material.
  • the mixture contains between 1 and 99% by volume, preferably between 2 and 90% by volume, particularly preferably between 3 and 40% by volume, in particular between 5 and 20% by volume, of the emitter based on the Total mixture of emitter and matrix material.
  • Suitable matrix materials which can be used in combination with the compounds according to the invention are aromatic ketones, aromatic phosphine oxides or aromatic sulfoxides or sulfones, e.g. B. according to WO 2004/013080, WO 2004/093207, WO 2006/005627 or WO 2010/006680, triarylamines, carbazole derivatives, z. B. CBP (N, N-biscarbazolylbiphenyl) or in WO 2005/039246, US 2005/0069729, JP 2004/288381, EP 1205527, WO 2008/086851 or WO 2013/041176, indolocarbazole derivatives, z. B.
  • CBP N, N-biscarbazolylbiphenyl
  • indenocarbazole derivatives z. according to WO 2010/136109, WO 2011/000455, WO 2013/041176 or WO 2013/056776, azacarbazole derivatives, e.g. B. according to EP 1617710, EP 1617711, EP 1731584, JP 2005/347160, bipolar matrix materials, z. B. according to WO 2007/137725, silanes, z. B. according to WO 2005/111172, azaborole or boron ester, z. B. according to WO 2006/117052, triazine derivatives, z.
  • a compound can be used as a co-host that does not participate, or does not participate to a significant extent, in charge transport, as described, for example, in WO 2010/108579.
  • suitable co-matrix material are compounds which have a large band gap and do not themselves participate, or at least not to a significant extent, in the charge transport of the emitting layer.
  • Such materials are preferably pure hydrocarbons. Examples of such materials can be found, for example, in WO 2009/124627 or in WO 2010/006680.
  • a compound according to the invention which is used as an emitter, is preferably used in combination with one or more phosphorescent materials (triplet emitters) and/or a compound which is a TADF (thermally activated delayed fluorescence) host material.
  • phosphorescent materials triplet emitters
  • TADF thermalally activated delayed fluorescence
  • a hyperfluorescence and/or hyperphosphorescence system is preferably formed here.
  • WO 2015/091716 A1 and WO 2016/193243 A1 disclose OLEDs which contain both a phosphorescent compound and a fluorescent emitter in the emission layer, with the energy being transferred from the phosphorescent compound to the fluorescent emitter (hyperphosphorescence).
  • the phosphorescent compound behaves like a host material.
  • host materials have higher singlet and triplet energies compared to the emitters, so that the energy of the host material can also be transferred to the emitter as optimally as possible.
  • the systems disclosed in the prior art have just such an energy relation.
  • Phosphorescence within the meaning of this invention is understood as meaning luminescence 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 complexes with transition metals or lanthanides, in particular all indium, platinum and copper complexes are to be regarded as phosphorescent compounds.
  • Particularly suitable phosphorescent compounds are compounds which, when suitably excited, emit light, preferably in the visible range, and also at least one atom with an atomic number greater than 20, preferably greater than 38 and less than 84, particularly preferably greater than 56 and less than 80 included, in particular a metal with this atomic number.
  • the phosphorescence emitters used are preferably compounds which contain copper, molybdenum, tungsten, rhenium, ruthenium, osmium, rhodium, iridium, palladium, platinum, silver, gold or europium, in particular compounds which contain iridium or platinum.
  • Examples of the emitters described above can be found in applications WO 00/70655, WO 2001/41512, WO 2002/02714, WO 2002/15645, EP 1191613, EP 1191612, EP 1191614, WO 05/033244, WO 05/019373, US 2005/ 0258742 WO 2009/146770 WO 2010/015307 WO 2010/031485 WO 2010/054731 WO 2010/054728 WO 2010/086089 WO 2010/099852 WO 2010/102709 WO 2010/099852 066898, WO 2011/157339, WO 2012/007086, WO 2014/008982, WO 2014/023377, WO 2014/094961, WO 2014/094960, WO 2015/036074, WO 2015/104045, WO 2015/104045, WO 2015/12018/12015/ WO 2016/124304, WO 2017/032439, WO 2018/011186, WO 2018/001990
  • a compound according to the invention can preferably be used in combination with a TADF host material and/or a TADF emitter, as set out above.
  • thermally activated delayed fluorescence is described, for example, by BH Uoyama et al., Nature 2012, Vol. 492, 234.
  • TADF thermally activated delayed fluorescence
  • a comparatively small singlet-triplet distance ⁇ E(S 1 -T 1 ) of, for example, less than about 2000 cm -1 is required in the emitter.
  • another compound can be provided in the matrix, which has a strong spin-orbit coupling, so that the spatial proximity and the interaction between the molecules that is possible with it an inter-system crossing is made possible, or the spin-orbit coupling is generated via a metal atom contained in the emitter.
  • the organic electroluminescent device according to the invention contains no separate hole injection layer and/or hole transport layer and/or hole blocking layer and/or electron transport layer, ie the emitting layer is directly adjacent to the hole injection layer or the anode and/or the emitting layer is directly adjacent to the electron transport layer or the electron injection layer or the cathode, as described for example in WO 2005/053051.
  • a metal complex which is the same or similar to the metal complex in the emitting layer directly adjacent to the emitting layer as hole transport or hole injection material, such as, for example, B. described in WO 2009/030981.
  • an organic electroluminescent device is preferred, is an organic electroluminescent device containing a compound of the formula (I) or the preferred embodiments detailed above in a hole-conducting layer as hole-conducting material.
  • Particular preference is given to compounds in which the groups Z 1 is N and at least one, preferably two, of the groups W 1 and Y or Y 2 are N(Ar a ), N(Ar b ), N(R), P(Ar b ), P(R), O, S or Se stands/stands.
  • an organic electroluminescent device containing a compound of the formula (I) or the preferred embodiments described above in an electron-conducting layer as electron transport material.
  • an organic electroluminescence device characterized in that one or more layers are coated using a sublimation process.
  • the materials are vapour-deposited in vacuum sublimation systems at an initial pressure of less than 10 -5 mbar, preferably less than 10 -6 mbar. However, it is also possible for the initial pressure to be even lower, for example less than 10 -7 mbar.
  • An organic electroluminescent device is also preferred, characterized in that one or more layers are coated using the OVPD (organic vapor phase deposition) method or with the aid of carrier gas sublimation.
  • the materials are applied at a pressure between 10 -5 mbar and 1 bar.
  • OVPD organic vapor phase deposition
  • a special case of this process is the OVJP (Organic Vapor Jet Printing) process, in which the materials are applied directly through a nozzle and thus structured.
  • an organic electroluminescent device characterized in that one or more layers of solution, such as. B. by spin coating, or with any printing method, such as. B. screen printing, flexographic printing, offset printing, LITI (Light Induced Thermal Imaging, thermal transfer printing), ink-jet printing (ink jet printing) or nozzle printing.
  • any printing method such as. B. screen printing, flexographic printing, offset printing, LITI (Light Induced Thermal Imaging, thermal transfer printing), ink-jet printing (ink jet printing) or nozzle printing.
  • Formulations for applying a compound of the formula (I) or its or its preferred embodiments described above are new.
  • a further subject of the present invention is therefore a formulation containing at least one solvent and one Compound according to formula (I) or the preferred embodiments thereof set out above.
  • Hybrid processes are also possible, in which, for example, one or more layers are applied from solution and one or more further layers are vapor-deposited.
  • the compounds according to the invention and the organic electroluminescent devices according to the invention are distinguished in particular by an improved service life compared to the prior art.
  • the other electronic properties of the electroluminescent devices, such as efficiency or operating voltage, remain at least as good.
  • the compounds according to the invention and the organic electroluminescent devices according to the invention are distinguished, compared with the prior art, in particular by improved efficiency and/or operating voltage and a longer service life.
  • the electronic devices according to the invention are characterized by one or more of the following surprising advantages over the prior art:
  • Electronic devices in particular organic electroluminescent devices containing compounds of the formula (I) or the preferred embodiments described above and below as emitters, have very narrow emission bands with low FWHM values (Full Width Half Maximum) and lead to emission that is particularly pure in color, recognizable at the small CIE y values. It is particularly surprising here that both blue emitters with low FWHM values and emitters with low FWHM values emitting in the green, yellow or red part of the color spectrum can also be provided. Electronic devices, in particular organic electroluminescent devices containing compounds of the formula (I) or the preferred embodiments described above and below, in particular as emitters, as hole conductor material and/or as electron transport material, have a very good service life.
  • these connections bring about, in particular, a low roll-off, ie a low drop in the power efficiency of the device at high luminance levels.
  • Electronic devices in particular organic electroluminescent devices containing compounds of the formula (I) or the preferred embodiments described above and below as emitters, as hole conductor material and/or as electron transport material, have excellent efficiency.
  • compounds according to the invention of the formula (I) or the preferred embodiments described above and below bring about a low operating voltage when used in electronic devices.
  • the compounds according to the invention of the formula (I) or the preferred embodiments described above and below exhibit very high stability and longevity.
  • optical loss channels can be avoided in electronic devices, in particular organic electroluminescent devices, with compounds of the formula (I) or the preferred embodiments detailed above and below. As a result, these devices are characterized by a high PL and thus high EL efficiency of emitters and excellent energy transfer from the matrices to dopants. 6. Compounds of the formula (I) or the preferred embodiments described above and below exhibit excellent glass film formation.
  • the following syntheses are carried out under a protective gas atmosphere in dried solvents.
  • the metal complexes are also handled with the exclusion of light or under yellow light.
  • the solvents and reagents can e.g. B. from Sigma-ALDRICH or ABCR.
  • the respective information in square brackets or the numbers given for individual compounds relate to the CAS numbers of the compounds known from the literature. For compounds that may have multiple enantiomeric, diastereomeric, or tautomeric forms, one form is shown as representative.
  • the precipitated solid is filtered off with suction, washed three times with 100 ml of water each time, filtered with suction and dried azeotropically with 300 ml of ethanol, the solid being concentrated in a slight vacuum at about 60° C. to a paste. After cooling, the product is filtered off with suction, washed once with a little ethanol and dried in vacuo. Yield: 27.8 g (62 mmol) 62%; Purity: approx. 95% according to 1 H-NMR.
  • the reaction mixture is poured into 1000 ml of 10% strength by weight ammonia solution, stirred for a further 20 minutes, the FS is filtered off with suction, washed three times with 200 ml of water each time and once with 100 ml of methanol and dried in vacuo.
  • Benzimidazoles resulting regioisomers are separated by chromatography (Combi-Flash, automatic column from A. Semrau).
  • reaction mixture is again cooled to -40.degree. 5.2 ml (55 mmol) of boron tribromide are added dropwise over a period of about 10 minutes. After the addition is complete, the reaction mixture is stirred at RT for 1 h. The reaction mixture is then cooled to 0° C., and 9.6 ml (55 mmol) of di-/so-propylethylamine are added dropwise over a period of about 30 min. The reaction mixture is then stirred at 160° C. for 16 h. After cooling, the di-/so-propylethylammonium hydrobromide is filtered off with suction via an inverted frit and the filtrate is cooled to -78.degree.
  • the organolithium is suspended in 300 ml of toluene and transferred to the extremely cold reaction mixture from step 2. It is stirred for a further 1 h and the reaction mixture is allowed to warm to RT overnight. 15 ml of acetone are carefully added to the reaction mixture and the mixture is evaporated to dryness a.
  • the oily residue is absorbed with DCM on ISOLUTE® and filtered hot through a bed of silica gel with a pentane-DCM mixture (10:1). The filtrate is concentrated to dryness.
  • the residue is flash chromatographed twice, silica gel, n-heptane/ethyl acetate, Torrent column automat from A. Semrau.
  • OLEDs according to the invention and OLEDs according to the prior art are produced using a general method according to WO 2004/058911, which is adapted to the conditions described here (layer thickness variation, materials used).
  • the OLEDs have the following layer structure: substrate/hole injection layer 1 (HIL1) consisting of Ref-HTM1 doped with 5% NDP-9 (commercially available from Novaled), 20 nm/hole transport layer 1 (HTL1) of: 160 nm HTM1 for blue OLEDs; 50 nm for Green & Yellow OLEDs; 110 mn for red OLEDs / hole transport layer 2 (HTL2) from: 10 nm for blue OLEDs; 20 nm for Green & Yellow OLEDs; 10 mn for Red OLEDs / Emission Layer (EML): 25 nm for Blue OLEDs; 40 nm for Green & Yellow OLEDs; 35 nm for red OLEDs / hole blocking layer (HBL) 10 nm / electron transport layer (ETL) 30 nm / electron injection layer (EIL) made of 1 nm ETM2 / and finally a cathode.
  • HIL1 substrate/hole injection layer 1
  • HTL1 substrate/
  • the emission layer always consists of at least one matrix material (host material, host material) and an emitting dopant (dopant, emitter), which is added to the matrix material or matrix materials by co-evaporation in a certain proportion by volume.
  • a specification such as SMB1:D1 (95%:5%) means that the material SEB1 is present in the layer in a volume proportion of 95% and D1 in a proportion of 5%.
  • Analog can also Electron transport layer consist of a mixture of two materials. The precise structure of the OLEDs can be found in Table 1. The materials used to fabricate the OLEDs are shown in Table 5.
  • the OLEDs are characterized by default.
  • the electroluminescence spectra, the current efficiency (measured in cd/A), the power efficiency (measured in lm/W) and the external quantum efficiency (EQE, measured in percent) as a function of the luminance, calculated from current-voltage-luminance curves ( IUL characteristics) assuming a Lambertian radiation characteristic.
  • the electroluminescence spectra are determined at a luminance of 1000 cd/m 2 .
  • the compounds according to the invention can be used, inter alia, as a dopant in the emission layer and as transport or blocking materials (HBL) in OLEDs.
  • HBL transport or blocking materials
  • the blue OLED devices show emission maxima in the range of 400 - 499 nm
  • the green OLED devices show emission maxima in the range of 500 - 540 nm. Both have narrow emission spectra with a full width half maximum (FWHM: Full Width Half Maximum) in the range of approx. 25 - 40nm on.
  • the external quantum efficiency EQE is typically 5.5 - 7.0%, with operating voltages of typically 4.0 - 4.2 for green and 4.5 - 4.7 V for blue OLED devices.
  • the component lifetimes are sufficient for the construction of commercial products.
  • HIL2 hole transport layer
  • the substrate Glass flakes coated with structured ITO (indium tin oxide) with a thickness of 50 nm are used as the substrate. For better processing, these are coated with the buffer (PEDOT) Clevios P VP AI 4083 (Heraeus Clevios GmbH, Leverkusen) PEDOT is at the top. The spin-coating takes place in air from water. The layer is then heated at 180° C. for 10 minutes. The hole transport layer and the emission layer are applied to the glass flakes coated in this way.
  • the hole transport layer is the polymer of the structure shown in Table 5 synthesized according to WO 2010/097155 . The polymer is dissolved in toluene so that the solution typically has a solids content of approx.
  • the layer thickness of 20 nm typical of a device is to be achieved by means of spin coating.
  • the layers are spun on in an inert gas atmosphere, in the present case argon, and baked at 180° C. for 60 minutes.
  • the emission layer is always made up of at least one matrix material H (host material, host material) and one emitting dopant (dopant, emitter).
  • H1 (95% by weight) is used as matrix material (see Table 5), and the compounds shown in Table 2 are used as dopant D (5% by weight).
  • the mixture for the emission layer is dissolved in toluene or chlorobenzene.
  • the typical solids content of such solutions is around 18 g/l if, as here, the layer thickness of 60 nm typical for a device is to be achieved by means of spin coating.
  • the layers are spun on in an inert gas atmosphere, in the present case argon, and baked at 130° to 150° C. for 10 minutes.
  • the materials for the electron transport layer and for the cathode are thermally evaporated in a vacuum chamber.
  • the electron transport layer can consist of more than one material, which are admixed to one another in a specific volume fraction by co-evaporation.
  • a specification such as ETM1 :ETM2 (50%:50%) means that the materials ETM1 and ETM2 are present in the layer in a volume proportion of 50% each.
  • the cathode is formed by a 100 nm thick aluminum layer. The materials used in the present case are shown in Table 5.
  • Results of the solution-processed OLEDs The blue OLED devices show emission maxima in the range of 430 - 499 nm, the green OLED devices show emission maxima in the range of 500 - 540 nm. Both have narrow emission spectra with a full width half maximum (FWHM: Full Width Half Maximum) in the range of approx. 25 - 50nm on.
  • the external quantum efficiency EQE is typically 4.5 - 5.5%, with operating voltages of typically 4.3 - 4.5 for green and 4.5 - 4.9 V for blue OLED devices.
  • the component lifetimes are sufficient for the construction of commercial products.

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)

Abstract

L'invention concerne des composés cycliques qui peuvent être utilisés dans des dispositifs électroniques, ainsi que des dispositifs électroniques, en particulier des dispositifs électroluminescents organiques renfermant lesdits composés.
EP21786986.6A 2020-10-16 2021-10-13 Composés hétérocycliques pour dispositifs électroluminescents organiques Pending EP4229064A1 (fr)

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CN116323859A (zh) 2023-06-23
WO2022079068A1 (fr) 2022-04-21

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