ELECTRONIC DEVICE

Description

[0001] The present application relates to an electronic device which contains at least one compound of formula (If), (Ik) or (Il) in an organic layer.

[0002] Electronic devices within the meaning of this application are understood in particular to mean so-called organic electronic devices that contain organic semiconductor materials as functional materials. This also particularly includes organic electroluminescent devices (OLEDs) and other electronic devices listed below.

[0003] The structure of OLEDs, in which organic semiconductors are used as functional materials, is described, for example, in US 4539507, US 5151629, EP 0676461, and WO 98 / 27136. The term OLED generally refers to electronic devices that contain organic material and emit light when an electrical voltage is applied.

[0004] There is great interest in improving the performance of electronic devices, especially OLEDs, particularly their lifetime and efficiency. Layers with hole-transporting functions in the electronic device, such as hole-injection layers, hole-transport layers, electron-blocking layers, and emitting layers, play an important role in this.

[0005] For this purpose, new materials with hole-transporting properties are continuously sought. They can be used in the aforementioned layers as pure materials, as main components, or as small-quantity components in combination with other materials. In hole-injecting layers, hole-transporting layers, and electron-blocking layers, materials with hole-transporting properties are typically used as pure substances. However, they can also be used in such layers in mixtures with a doped additional material. In emitting layers, particularly in phosphorescent emitting layers, materials with hole-transporting properties are preferably used as the main component of the layer in combination with other materials, such as emitter materials. In this case, they are referred to as host materials of the emitting layer.

[0006] It is known in the art to use triarylamines as materials with hole-transporting properties in the above-mentioned layers. These can be monotriarylamines, as described, for example, in JP 1995 / 053955, WO 2006 / 123667, and JP 2010 / 222268, or bis- or higher-valent amines, as described, for example, in US Pat. No. 7,504,163 or US Pat. No. 2005 / 0184657. Known examples of such triarylamine compounds include tris-p-biphenylamine, N,N'-di-1-naphthyl-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB), and 4,4',4"-tris-(3-methylphenylphenylamino)-triphenylamine (MTDATA).

[0007] The use of triarylamine compounds with a relatively complex, asymmetric structure as hole-transporting compounds in OLEDs is also known (WO 2011 / 021520). These compounds have a triarylamino group bonded to a dibenzofuran or similar aryl group. In each case, only a single triarylamino group is present in the compound.

[0008] Also known in the prior art are compounds in which two carbazole groups are bonded opposite each other to a dibenzofuran group, for example, from WO 2011 / 004639. However, such compounds are less suitable as hole-transport materials due to the position of their HOMO.

[0009] Furthermore, OLEDs with dibenzofuran compounds to which carbazole groups are bound are known, e.g. from JP2012049518.

[0010] Despite these advances, there is still a need for compounds with hole-transporting properties for use in electronic devices. In particular, there is a need for compounds that exhibit excellent hole mobility and a suitable triplet level for use in phosphorescent OLEDs. Furthermore, the compounds should possess a high glass transition temperature. Compounds with the above-mentioned properties can produce OLEDs with good performance characteristics, particularly high efficiency and a long lifetime.

[0011] Surprisingly, it has now been discovered that compounds in which two triarylamino groups, or one triarylamino group and one carbazole group, are bonded "face-to-face," i.e., opposite each other, to a dibenzofuran or similar aryl group, exhibit excellent hole-transporting properties. Furthermore, they exhibit excellent hole mobility and a suitable triplet level for use in phosphorescent OLEDs. Furthermore, they exhibit a high glass transition temperature, making them particularly suitable for use in thin amorphous organic layers in OLEDs.

[0012] Individual compounds with such a structure are known in the prior art (G.-Q. Li et al., Tetrahedron, 2011, 67, 6804-6811), but the technical teaching there is limited to the synthesis of the compounds. There is no suggestion of using the compounds as functional materials in electronic devices.

[0013] The invention therefore relates to an electronic device according to claim 1.

[0014] A fused aryl group is defined as an aryl group containing two or more aromatic rings that are fused together, i.e., share one or more aromatic bonds. A similar definition applies to heteroaryl groups. Examples of fused aryl groups, regardless of the number of ring atoms, are naphthyl, anthracenyl, pyrenyl, phenanthrenyl, and perylenyl. Examples of fused heteroaryl groups are quinolinyl, indolyl, carbazolyl, and acridinyl.

[0015] The following are general definitions for chemical groups within the scope of this application: An aryl group within the meaning of this invention contains 6 to 60 aromatic ring atoms; a heteroaryl group within the meaning of this invention contains 5 to 60 aromatic ring atoms, of which at least one is a heteroatom. The heteroatoms are preferably selected from N, O, and S. This represents the basic definition. If other preferences are stated in the description of the present invention, for example with regard to the number of aromatic ring atoms or the heteroatoms contained, these apply.

[0016] An aryl group or heteroaryl group is understood to be either a simple aromatic cycle, i.e., benzene, or a simple heteroaromatic cycle, for example, pyridine, pyrimidine, or thiophene, or a fused (fused) aromatic or heteroaromatic polycycle, for example, naphthalene, phenanthrene, quinoline, or carbazole. A fused (fused) aromatic or heteroaromatic polycycle, for the purposes of the present application, consists of two or more fused simple aromatic or heteroaromatic cycles.

[0017] An aryl or heteroaryl group, which may be substituted by the above-mentioned radicals and which may be linked to the aromatic or heteroaromatic ring via any position, is understood to mean, in particular, groups derived from benzene, naphthalene, anthracene, phenanthrene, pyrene, dihydropyrene, chrysene, perylene, fluoranthene, benzanthracene, benzphenanthrene, tetracene, pentacene, benzopyrene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole, indole, isoindole, carbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, phenothiazine, phenoxazine, pyrazole, indazole, imidazole, benzimidazole, Naphthimidazole, Phenanthrimidazole, Pyridimidazole, Pyrazinimidazole, Quinoxalinimidazole, Oxazole, Benzoxazole, Naphthoxazole, Anthroxazole, Phenanthroxazole, Isoxazole, 1,2-thiazole, 1,3-thiazole, Benzothiazole, Pyridazine, Benzopyridazine, Pyrimidine, Benzpyrimidine,Quinoxaline, pyrazine, phenazine, naphthyridine, azacarbazole, benzocarboline, phenanthroline, 1,2,3-triazole, 1,2,4-triazole, benzotriazole, 1,2,3-oxadiazole, 1,2,4-oxadiazole, 1,2,5-oxadiazole, 1,3,4-oxadiazole, 1,2,3-thiadiazole, 1,2,4-thiadiazole, 1,2,5-thiadiazole, 1,3,4-thiadiazole, 1,3,5-triazine, 1,2,4-triazine, 1,2,3-triazine, tetrazole, 1,2,4,5-tetrazine, 1,2,3,4-tetrazine, 1,2,3,5-tetrazine, purine, Pteridine, indolizine and benzothiadiazole.

[0018] An aryloxy group, as defined in the present invention, is understood to mean an aryl group, as defined above, which is bonded via an oxygen atom. An analogous definition applies to heteroaryloxy groups.

[0019] An aromatic ring system within the meaning of this invention contains 6 to 60 C atoms in the ring system. A heteroaromatic ring system within the meaning of this invention contains 5 to 60 aromatic ring atoms, at least one of which is a heteroatom. The heteroatoms are preferably selected from N, O and / or S. An aromatic or heteroaromatic ring system within the meaning of this invention is to be understood as a system which does not necessarily contain only aryl or heteroaryl groups, but in which several aryl or heteroaryl groups can also be connected by a non-aromatic unit (preferably less than 10% of the atoms other than H), such as, for example, an sp 3< -hybridized C, Si, N or O atom, an sp 2< -hybridized C or N atom or an sp-hybridized C atom. For example, systems such as 9,9'-spirobifluorene, 9,9'-diarylfluorene, triarylamine, diaryl ether, stilbene, etc.are understood as aromatic ring systems within the meaning of this invention, as are systems in which two or more aryl groups are linked, for example, by a linear or cyclic alkyl, alkenyl, or alkynyl group, or by a silyl group. Furthermore, systems in which two or more aryl or heteroaryl groups are linked to one another via single bonds are also understood as aromatic or heteroaromatic ring systems within the meaning of this invention, for example systems such as biphenyl, terphenyl, or diphenyltriazine.

[0020] An aromatic or heteroaromatic ring system with 5 - 60 aromatic ring atoms, which can each be substituted by radicals as defined above and which can be linked to the aromatic or heteroaromatic ring via any position, is understood to mean in particular groups derived from benzene, naphthalene, anthracene, benzanthracene, phenanthrene, benzphenanthrene, pyrene, chrysene, perylene, fluoranthene, naphthacene, pentacene, benzopyrene, biphenyl, biphenylene, terphenyl, terphenylene, quaterphenyl, fluorene, spirobifluorene, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis- or trans-indenofluorene, truxene, isotruxene, spirotruxene, spiroisotruxene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole, indole, Isoindole, carbazole, indolocarbazole, indenocarbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, phenothiazine,Phenoxazin, Pyrazol, Indazol, Imidazol, Benzimidazol, Naphthimidazol, Phenanthrimidazol, Pyridimidazol, Pyrazinimidazol, Chinoxalinimidazol, Oxazol, Benzoxazol, Naphthoxazol, Anthroxazol, Phenanthroxazol, Isoxazol, 1,2-Thiazol, 1,3-Thiazol, Benzothiazol, Pyridazin, Benzopyridazin, Pyrimidin, Benzpyrimidin, Chinoxalin, 1,5-Diazaanthracen, 2,7-Diazapyren, 2,3-Diazapyren, 1,6-Diazapyren, 1,8-Diazapyren, 4,5-Diazapyren, 4,5,9,10-Tetraazaperylen, Pyrazin, Phenazin, Phenoxazin, Phenothiazin, Fluorubin, Naphthyridin, Azacarbazol, Benzocarbolin, Phenanthrolin, 1,2,3-Triazol, 1,2,4-Triazol, Benzotriazol, 1,2,3-Oxadiazol, 1,2,4-Oxadiazol, 1,2,5-Oxadiazol, 1,3,4-Oxadiazol, 1,2,3-Thiadiazol, 1,2,4-Thiadiazol, 1,2,5-Thiadiazol, 1,3,4-Thiadiazol, 1,3,5-Triazin, 1,2,4-Triazin, 1,2,3-Triazin, Tetrazol, 1,2,4,5-Tetrazin, 1,2,3,4-Tetrazin, 1,2,3,5-Tetrazin, Purin, Pteridin, Indolizin und Benzothiadiazol oder Kombinationen dieser Gruppen.,

[0021] In the context of the present invention, a straight-chain alkyl group having 1 to 40 C atoms or a branched or cyclic alkyl group having 3 to 40 C atoms or an alkenyl or alkynyl group having 2 to 40 C atoms, in which individual H atoms or CH 2 groups can also be substituted by the groups mentioned above in the definition of the radicals, preferably the radicals methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, 2-methylbutyl, n-pentyl, s-pentyl, cyclopentyl, neopentyl, n-hexyl, cyclohexyl, neohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, Trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl, ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl, ethynyl, propynyl, butynyl, pentinyl, hexynyl or octynyl.Unter einer Alkoxy- oder Thioalkylgruppe mit 1 bis 40 C-Atomen werden bevorzugt Methoxy, Trifluormethoxy, 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, Pentafluorethoxy, 2,2,2-Trifluorethoxy, 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, Trifluormethylthio, Pentafluorethylthio, 2,2,2-Trifluorethylthio, Ethenylthio, Propenylthio, Butenylthio, Pentenylthio, Cyclopentenylthio, Hexenylthio, Cyclohexenylthio, Heptenylthio, Cycloheptenylthio, Octenylthio, Cyclooctenylthio, Ethinylthio, Propinylthio, Butinylthio, Pentinylthio, Hexinylthio, Heptinylthio oder Octinylthio verstanden.

[0022] For the purposes of the present application, the phrase "two or more residues can form a ring" is understood to mean, among other things, that the two residues are linked by a chemical bond. Furthermore, the above phrase also means that if one of the two residues represents hydrogen, the second residue bonds to the position to which the hydrogen atom was bonded, forming a ring.

[0023] Preferably, the group E is selected, identically or differently at each occurrence, from a single bond, C(R 1< ) 2 , C=O, O, S and NR 1< . It is particularly preferably selected from a single bond, O and S.

[0024] It is preferred that no more than two adjacent Z groups are equal to N. Furthermore, no more than two Z groups in an aromatic ring are equal to N. More preferably, Z is generally equal to CR 1< .

[0025] The group W is preferably selected, identically or differently at each occurrence, from O, S and NR 1< . It is preferably selected from O and S.

[0026] The group Ar 1< is preferably selected, identically or differently, from aryl or heteroaryl groups having 6 to 10 aromatic ring atoms, which may be substituted by one or more radicals R 1<. Ar 1< is particularly preferably selected from phenyl, naphthyl, pyridyl, pyrimidyl, pyridazyl, pyrazinyl, and triazinyl, each of which may be substituted by one or more radicals R 1<.

[0027] The group Ar 2< is preferably selected, identically or differently, from aryl or heteroaryl groups having 6 to 10 aromatic ring atoms, which may be substituted by one or more radicals R 1<. Ar 2< is particularly preferably selected from phenyl, naphthyl, pyridyl, pyrimidyl, pyridazyl, pyrazinyl, and triazinyl, each of which may be substituted by one or more radicals R 1<.

[0028] The group X is preferably selected, identically or differently at each occurrence, from C(R 1< ) 2 , C=O, O, S and NR 1< .

[0029] R 1< is preferably, identically or differently on each occurrence, H, D, F, CN, Si(R 2< ) 3 , N(R 2< ) 2 , a straight-chain alkyl or alkoxy group having 1 to 20 C atoms or a branched or cyclic alkyl or alkoxy group having 3 to 20 C atoms, where the abovementioned groups may each be substituted by one or more radicals R 2< and where in the abovementioned groups one or more CH 2 groups may be replaced by -C=C-, - R 2< C=CR 2< -, Si(R 2< ) 2 , C=O, C=NR 2< , -NR 2< -, -O-, -S-, -C(=O)O- or - C(=O)NR 2< -, or an aromatic or heteroaromatic ring system having 5 to 20 aromatic Ring atoms, which may be substituted by one or more radicals R 2<, where two or more radicals R 1< may be linked together to form a ring.

[0030] The index n is preferably, identically or differently, 0 or 1 at each occurrence, particularly preferably 0.

[0031] The index i is preferably equal to 0.

[0032] Furthermore, for compounds of formulas (If), (Ik) or (II) it is preferred that a group selected from groups of formula (A-1) and (A-2) is bonded to the positions marked with *.

[0033] Furthermore, it is preferred for compounds of formulas (If), (Ik) or (II) that they do not contain condensed aryl groups with more than 10 aromatic ring atoms.

[0034] Furthermore, it is preferred for compounds of formulas (If), (Ik) or (Il) that they contain no further arylamino groups in addition to groups (A-1), (A-2), (C-1) and (C-2). They particularly preferably contain no further amino groups.

[0035] Furthermore, it is preferred for compounds of formulas (If), (Ik) or (II) that they do not have any further carbazole groups in addition to the groups (A-1), (A-2), (C-1) and (C-2).

[0036] Furthermore, it is preferred for compounds of formulas (If), (Ik) or (II) not to contain electron-deficient heteroaryl groups. For the purposes of the present invention, electron-deficient heteroaryl groups are understood to mean, in particular, heteroaromatic six-membered rings having one or more nitrogen atoms and heteroaromatic five-membered rings having two or more heteroatoms, in particular heteroatoms selected from N, O, and S.

[0037] The following compounds are mentioned as examples, whereby only the compounds of formulas (If), (Ik) and (II) fall within the scope of the invention. where the compounds can be substituted at all free positions by radicals R 1<, and where a group selected from the groups of the formulas (A-1), (A-2), (C-1) and (C-2) is bonded to the positions marked with * and where a group selected from groups of the formulas (A-1) and (A-2) is bonded to at least one of the positions marked with *.

[0038] The preferred embodiments of groups specified in the application are also preferred.

[0039] A group of formula (A-1) preferably corresponds to a group of the following formulas (A-1-1) to (A-1-6) where the symbols appearing are as defined above. The preferred embodiments of groups indicated in the application are also considered preferred.

[0040] In particular, it is preferred that in formulas (A-1-1) to (A-1-6), Ar 1< and Ar 2< are selected, identically or differently, from phenyl, naphthyl, pyridyl, pyrimidyl, pyridazyl, pyrazinyl, and triazinyl, each of which may be substituted by one or more radicals R 1<. Furthermore, it is preferred that the group X is selected, identically or differently, at each occurrence from C(R 1<) 2 , C=O, O, S, and NR 1< .

[0041] Particularly preferred are the formulas (A-1-1) and (A-1-2).

[0042] A group of formula (A-2) preferably corresponds to a group of the following formulas (A-2-1) to (A-2-2) where the symbols appearing are as defined above. The preferred embodiments of groups specified in the application are also considered preferred.

[0043] In particular, it is preferred that in formulas (A-2-1) to (A-2-2), Ar 1< is selected, identically or differently, from phenyl, naphthyl, pyridyl, pyrimidyl, pyridazyl, pyrazinyl, and triazinyl, each of which may be substituted by one or more radicals R 1<. Furthermore, it is preferred that the group X is selected, identically or differently at each occurrence, from C(R 1<) 2 , C=O, O, S, and NR 1< .

[0044] The formula (A-2-1) is particularly preferred.

[0045] A group of formula (C-1) preferably corresponds to a group of the following formulae (C-1-1) to (C-1-4) where the symbols appearing are as defined above. The preferred embodiments of groups specified in the application are also considered preferred.

[0046] In particular, it is preferred that in the formulas (C-1-1) to (C-1-4) Ar 1< and Ar 2< are the same or different and are selected from phenyl, naphthyl, pyridyl, pyrimidyl, pyridazyl, pyrazinyl and triazinyl, each of which may be substituted by one or more radicals R 1<.

[0047] A group of formula (C-2) preferably corresponds to a group of the following formula (C-2-1) where Ar 1< is the same or different and is selected from phenyl, naphthyl, pyridyl, pyrimidyl, pyridazyl, pyrazinyl and triazinyl, each of which may be substituted by one or more radicals R 1<.

[0048] The following structures are mentioned as examples, whereby only the structures with a basic structure of the formulas (If), (Ik) or (Il) fall under the invention (scheme below in combination with table): Struktur Grundkörper der Formel Gruppe in Position * links Gruppe in Position * rechts (I-a-1) (I-a) (A-1) (A-1) (I-a-2) " (A-1) (A-2) (I-a-3) " (A-1) (C-1) (I-a-4) " (A-1) (C-2) (I-a-5) " (A-2) (A-2) (I-a-6) " (A-2) (C-1) (I-a-7) " (A-2) (C-2) (I-b-1) (I-b) (A-1) (A-1) (I-b-2) " (A-1) (A-2) (I-b-3) " (A-1) (C-1) (I-b-4) " (A-1) (C-2) (I-b-5) " (A-2) (A-2) (I-b-6) " (A-2) (C-1) (I-b-7) " (A-2) (C-2) (I-c-1) (I-c) (A-1) (A-1) (I-c-2) " (A-1) (A-2) (I-c-3) " (A-1) (C-1) (I-c-4) " (A-1) (C-2) (I-c-5) " (A-2) (A-2) (I-c-6) " (A-2) (C-1) (I-c-7) " (A-2) (C-2) (I-d-1) (I-d) (A-1) (A-1) (I-d-2) " (A-1) (A-2) (I-d-3) " (A-1) (C-1) (I-d-4) " (A-1) (C-2) (I-d-5) " (A-2) (A-2) (I-d-6) " (A-2) (C-1) (I-d-7) " (A-2) (C-2) (I-e-1) (I-e) (A-1) (A-1) (I-e-2) " (A-1) (A-2) (I-e-3) " (A-1) (C-1) (I-e-4) " (A-1) (C-2) (I-e-5) " (A-2) (A-2) (I-e-6) " (A-2) (C-1) (I-e-7) " (A-2) (C-2) (I-f-1) (I-f) (A-1) (A-1) (I-f -2) " (A-1) (A-2) (I-f-3) " (A-1) (C-1) (I-f-4) " (A-1) (C-2) (I-f-5) " (A-2) (A-2) (I-f-6) " (A-2) (C-1) (I-f-7) " (A-2) (C-2) (I-g-1) (I-g) (A-1) (A-1) (I-g-2) " (A-1) (A-2) (I-g-3) " (A-1) (C-1) (I-g-4) " (A-1) (C-2) (I-g-5) " (A-2) (A-2) (I-g-6) " (A-2) (C-1) (I-g-7) " (A-2) (C-2) (I-h-1) (I-h) (A-1) (A-1) (I-h-2) " (A-1) (A-2) (I-h-3) " (A-1) (C-1) (I-h-4) " (A-1) (C-2) (I-h-5) " (A-2) (A-2) (I-h-6) " (A-2) (C-1) (I-h-7) " (A-2) (C-2) (I-i-1) (I-i) (A-1) (A-1) (I-i-2) " (A-1) (A-2) (I-i-3) " (A-1) (C-1) (I-i-4) " (A-1) (C-2) (I-i-5) " (A-2) (A-2) (I-i-6) " (A-2) (C-1) (I-i-7) " (A-2) (C-2) (I-j-1) (I-j) (A-1) (A-1) (I-i-2) " (A-1) (A-2) (I-i-3) " (A-1) (C-1) (I-i-4) " (A-1) (C-2) (I-i-5) " (A-2) (A-2) (I-i-6) " (A-2) (C-1) (I-j-7) " (A-2) (C-2) (I-k-1) (I-k) (A-1) (A-1) (I-k-2) " (A-1) (A-2) (I-k-3) " (A-1) (C-1) (I-k-4) " (A-1) (C-2) (I-k-5) " (A-2) (A-2) (I-k-6) " (A-2) (C-1) (I-k-7) " (A-2) (C-2) (I-l-1) (I-I) (A-1) (A-1) (I-l-2) " (A-1) (A-2) (I-l-3) " (A-1) (C-1) (I-l-4) " (A-1) (C-2) (I-l-5) " (A-2) (A-2) (I-l-6) " (A-2) (C-1) (I-l-7) " (A-2) (C-2) (I-m-1) (I-m) (A-1) (A-1) (I-m-2) " (A-1) (A-2) (I-m-3) " (A-1) (C-1) (I-m-4) " (A-1) (C-2) (I-m-5) " (A-2) (A-2) (I-m-6) " (A-2) (C-1) (I-m-7) " (A-2) (C-2) (I-n-1) (I-n) (A-1) (A-1) (I-n-2) " (A-1) (A-2) (I-n-3) " (A-1) (C-1) (I-n-4) " (A-1) (C-2) (I-n-5) " (A-2) (A-2) (I-n-6) " (A-2) (C-1) (I-n-7) " (A-2) (C-2) (I-o-1) (I-0) (A-1) (A-1) (I-o-2) " (A-1) (A-2) (I-o-3) " (A-1) (C-1) (I-o-4) " (A-1) (C-2) (I-o-5) " (A-2) (A-2) (I-o-6) " (A-2) (C-1) (I-o-7) " (A-2) (C-2) (I-p-1) (I-p) (A-1) (A-1) (I-p-2) " (A-1) (A-2) (I-p-3) " (A-1) (C-1) (I-p-4) " (A-1) (C-2) (I-p-5) " (A-2) (A-2) (I-p-6) " (A-2) (C-1) (I-p-7) " (A-2) (C-2) (I-q-1) (I-q) (A-1) (A-1) (I-q-2) " (A-1) (A-2) (I-q-3) " (A-1) (C-1) (I-q-4) " (A-1) (C-2) (I-q-5) " (A-2) (A-2) (I-q-6) " (A-2) (C-1) (I-q-7) " (A-2) (C-2) (I-r-1) (I-r) (A-1) (A-1) (I-r-2) " (A-1) (A-2) (I-r-3) " (A-1) (C-1) (I-r-4) " (A-1) (C-2) (I-r-5) " (A-2) (A-2) (I-r-6) " (A-2) (C-1) (I-r-7) " (A-2) (C-2) (I-s-1) (I-s) (A-1) (A-1) (I-s-2) " (A-1) (A-2) (I-s-3) " (A-1) (C-1) (I-s-4) " (A-1) (C-2) (I-s-5) " (A-2) (A-2) (I-s-6) " (A-2) (C-1) (Is-7) " (A-2) (C-2) (It-1) (It) (A-1) (A-1) (It-2) " (A-1) (A-2) (It-3) " (A-1) (C-1) (It-4) " (A-1) (C-2) (It-5) " (A-2) (A-2) (It-6) " (A-2) (C-1) (It-7) " (A-2) (C-2) (Iu-1) (Iu) (A-1) (A-1) (Iu-2) " (A-1) (A-2) (Iu-3) " (A-1) (C-1) (Iu-4) " (A-1) (C-2) (Iu-5) " (A-2) (A-2) (Iu-6) " (A-2) (C-1) (Iu-7) " (A-2) (C-2) (IV-1) (IV) (A-1) (A-1) (IV-2) " (A-1) (A-2) (IV-3) " (A-1) (C-1) (IV-4) " (A-1) (C-2) (IV-5) " (A-2) (A-2) (IV-6) " (A-2) (C-1) (IV-7) " (A-2) (C-2) (Iw-1) (Iw) (A-1) (A-1) (Iw-2) " (A-1) (A-2) (Iw-3) " (A-1) (C-1) (Iw-4) " (A-1) (C-2) (Iw-5) " (A-2) (A-2) (Iw-6) " (A-2) (C-1) (Iw-7) " (A-2) (C-2) (II-a-1) (II-a) (A-1) (A-1) (II-a-2) " (A-1) (A-2) (II-a-3) " (A-1) (C-1) (II-a-4) " (A-1) (C-2) (II-a-5) " (A-2) (A-2) (II-a-6) " (A-2) (C-1) (II-a-7) " (A-2) (C-2) (II-b-1) (II-b) (A-1) (A-1) (II-b-2) " (A-1) (A-2) (II-b-3) " (A-1) (C-1) (II-b-4) " (A-1) (C-2) (II-b-5) " (A-2) (A-2) (II-b-6) " (A-2) (C-1) (II-b-7) " (A-2) (C-2)

[0049] The preferred embodiments specified in the application, in particular the preferred embodiments of groups (A-1), (A-2), (C-1) and (C-2), apply to the structures from the table above.

[0050] The following compounds are examples of compounds, all of which, with the exception of compounds 37-45, do not fall within claim 1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71

[0051] The compounds can be prepared according to Schemes 1-4.

[0052] The corresponding monoboronic acids can be prepared by Suzuki coupling (Scheme 1) or Buchwald coupling (Scheme 2) followed by silylation (a or b). Reaction of these monoboronic acids via Suzuki coupling with corresponding aryl bromides or aryl chlorides leads to the corresponding target compounds. R = organic residue Ar = aromatic or heteroaromatic ring system E = single bond, O, S, C=O... R = organic residue Ar = aromatic or heteroaromatic ring system E = single bond, O, S, C=O...

[0053] Another possibility is the reaction of a dihalide with 1 eq. of the corresponding arylboronic acid followed by Suzuki coupling to the desired product (Scheme 3, alternative a), whereby the synthesis comprises similar steps as shown in Scheme 1.

[0054] Another possibility is the reaction of a dihalide with 2 eq. of a corresponding boronic acid (Scheme 3, alternative b) R = organic radical Ar, Ar' = aromatic or heteroaromatic ring system E = single bond, O, S, C=O... Y = I, Br, ...

[0055] A synthetic route starting from an unfunctionalized starting compound such as a dibenzofuran derivative is shown below (Scheme 4).

[0056] The methods shown for synthesizing the compounds are to be understood as examples. The skilled person can develop alternative synthesis routes within the scope of his or her general technical knowledge.

[0057] The invention further relates to the use of a compound of formula (If), (Ik) or (Il) in an electronic device, preferably in a hole-transporting and / or in an emitting layer.

[0058] The electronic device according to the invention is preferably an organic electroluminescent device (OLED).

[0059] The organic layer containing the compound of formula (If), (Ik) or (II) is preferably a layer with a hole-transporting function. It is particularly preferably a hole-injection layer, a hole-transport layer, an electron-blocking layer, or an emitting layer.

[0060] A hole transport layer according to the present application is a layer with a hole transporting function which is located between the anode and the emitting layer.

[0061] For the purposes of the present application, hole-injection layers and electron-blocking layers are understood as specific embodiments of hole-transport layers. In the case of multiple hole-transport layers between the anode and the emitting layer, a hole-injection layer is a hole-transport layer that directly adjoins the anode or is separated from it only by a single coating of the anode. In the case of multiple hole-transport layers between the anode and the emitting layer, an electron-blocking layer is the hole-transport layer that directly adjoins the emitting layer on the anode side.

[0062] If the compound of formula (If), (Ik) or (II) is used as a hole-transport material in a hole-transport layer, a hole-injection layer or an electron-blocking layer, the compound can be used as pure material, i.e. in a proportion of 100% in the hole-transport layer, or it can be used in combination with one or more other compounds. According to a preferred embodiment, the organic layer comprising the compound of formula (If), (Ik) or (II) then additionally contains one or more p-dopants.

[0063] According to the present invention, p-dopants preferably used are those organic electron acceptor compounds which can oxidize one or more of the other compounds of the mixture.

[0064] Particularly preferred embodiments of p-dopants are the compounds disclosed in WO 2011 / 073149, EP 1968131, EP 2276085, EP 2213662, EP 1722602, EP 2045848, DE 102007031220, US 8044390, US 8057712, WO 2009 / 003455, WO 2010 / 094378, WO 2011 / 120709, US 2010 / 0096600 and WO 2012 / 095143.

[0065] In a further preferred embodiment of the invention, the compound according to formula (If), (Ik) or (II) is present in the electronic device as a hole-transporting material in a hole-transporting layer in combination with a hexaazatriphenylene derivative, as described in US 2007 / 0092755. The hexaazatriphenylene derivative is particularly preferably used in a separate layer.

[0066] It is further preferred that the organic layer containing the compound of formula (If), (Ik) or (II) is an emitting layer.

[0067] In a further embodiment of the present invention, the compound of formula (If), (Ik) or (II) is present in the electronic device as matrix material in combination with one or more dopants, preferably phosphorescent dopants.

[0068] The term phosphorescent dopants typically includes compounds in which light emission occurs through a spin-forbidden transition, for example a transition from an excited triplet state or a state with a higher spin quantum number, for example a quintet state.

[0069] Particularly suitable phosphorescent dopants are compounds which, upon suitable excitation, emit light, preferably in the visible range, and which also contain 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. Preferably, compounds containing copper, molybdenum, tungsten, rhenium, ruthenium, osmium, rhodium, iridium, palladium, platinum, silver, gold, or europium are used as phosphorescent dopants, in particular compounds containing iridium, platinum, or copper.

[0070] For the purposes of this application, all luminescent iridium, platinum, or copper complexes are considered phosphorescent compounds. Examples of phosphorescent dopants are listed in a subsequent section.

[0071] In a system containing a matrix material and a dopant, a dopant is understood to be the component whose proportion in the mixture is the smaller. Similarly, in a system containing a matrix material and a dopant, a matrix material is understood to be the component whose proportion in the mixture is the larger.

[0072] In this case, the proportion of the matrix material in the emitting layer is between 50.0 and 99.9 vol.%, preferably between 80.0 and 99.5 vol.% and particularly preferably for fluorescent emitting layers between 92.0 and 99.5 vol.% and for phosphorescent emitting layers between 85.0 and 97.0 vol.%.

[0073] Accordingly, the proportion of the dopant is between 0.1 and 50.0 vol.%, preferably between 0.5 and 20.0 vol.% and particularly preferably for fluorescent emitting layers between 0.5 and 8.0 vol.% and for phosphorescent emitting layers between 3.0 and 15.0 vol.%.

[0074] An emitting layer of an organic electroluminescent device can also contain systems comprising multiple matrix materials (mixed-matrix systems) and / or multiple dopants. In this case, too, the dopants are generally the materials whose proportion is the smaller in the system, and the matrix materials are the materials whose proportion is the larger in the system. In individual cases, however, the proportion of a single matrix material in the system may be smaller than the proportion of a single dopant.

[0075] In a further preferred embodiment of the invention, the compounds according to formula (If), (Ik) or (II) are used as a component of mixed-matrix systems. The mixed-matrix systems preferably comprise two or three different matrix materials, particularly preferably two different matrix materials. Preferably, one of the two materials is a material with hole-transporting properties and the other material is a material with electron-transporting properties. However, the desired electron-transporting and hole-transporting properties of the mixed-matrix components can also be combined mainly or completely in a single mixed-matrix component, with the further mixed-matrix component(s) fulfilling other functions.The two different matrix materials can be present in a ratio of 1:50 to 1:1, preferably 1:20 to 1:1, particularly preferably 1:10 to 1:1, and most preferably 1:4 to 1:1. Mixed-matrix systems are preferably used in phosphorescent organic electroluminescent devices. More detailed information on mixed-matrix systems can be found, among other things, in the application WO 2010 / 108579.

[0076] Particularly suitable matrix materials which can be used in combination with the compounds according to the invention as matrix components of a mixed matrix system are selected from the preferred matrix materials for phosphorescent dopants or the preferred matrix materials for fluorescent dopants listed below, depending on the type of dopant used in the mixed matrix system.

[0077] Preferred phosphorescent dopants for use in mixed matrix systems are the preferred phosphorescent dopants listed below.

[0078] In addition to the cathode, anode, and the layer containing the compound of formula (If), (Ik), or (II), the electronic device may contain further layers. These are, for example, selected from one or more hole injection layers, hole transport layers, hole blocking layers, emitting layers, electron transport layers, electron injection layers, electron blocking layers, exciton blocking layers, interlayers, and 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 )and / or organic or inorganic p / n junctions. However, it should be noted that not every one of these layers is necessarily present.

[0079] The sequence of layers of the organic electroluminescent device is preferably as follows: anode-hole injection layer-hole transport layer-emitting layer-electron transport layer-electron injection layer-cathode.

[0080] It should be noted again that not all of the layers mentioned need to be present and / or that additional layers may be present.

[0081] The organic electroluminescent device according to the invention can contain a plurality of emitting layers. In this case, these emitting layers particularly preferably have a total of a plurality of emission maxima between 380 nm and 750 nm, resulting in overall white emission, i.e., different emitting compounds that can fluoresce or phosphoresce and that emit blue, yellow, orange, or red light are used in the emitting layers. Particular preference is given to three-layer systems, i.e., systems with three emitting layers, wherein the three layers exhibit blue, green, and orange or red emission (for the basic structure, see, for example, WO 2005 / 011013). It should be noted that, instead of a plurality of color-emitting emitter compounds, a single emitter compound that emits in a broad wavelength range may also be suitable for generating white light.

[0082] Preferred embodiments of the functional layers and functional materials of the device according to the invention follow: Examples of phosphorescent dopants can be found in the applications WO 2000 / 70655, WO 2001 / 41512, WO 2002 / 02714, WO 2002 / 15645, EP 1191613, EP 1191612, EP 1191614, WO 2005 / 033244, WO 2005 / 019373, and US 2005 / 0258742. In general, all phosphorescent complexes as used in the prior art for phosphorescent OLEDs and as known to those skilled in the art in the field of organic electroluminescent devices are suitable for use in the devices according to the invention.

[0083] Explicit examples of phosphorescent dopants are listed in the following table.

[0084] Preferred fluorescent dopants are selected from the class of arylamines. An arylamine or an aromatic amine within the meaning of this invention is understood to be a compound containing three substituted or unsubstituted aromatic or heteroaromatic ring systems directly bonded to the nitrogen. Preferably, at least one of these aromatic or heteroaromatic ring systems is a fused ring system, particularly preferably with at least 14 aromatic ring atoms. Preferred examples thereof are aromatic anthraceneamines, aromatic anthracenediamines, aromatic pyreneamines, aromatic pyrenediamines, aromatic chrysenamines, or aromatic chrysenediamines. An aromatic anthraceneamine is understood to be a compound in which a diarylamino group is bonded directly to an anthracene group, preferably in the 9-position.An aromatic anthracenediamine is understood to be a compound in which two diarylamino groups are bonded directly to an anthracene group, preferably in the 9,10-position. Aromatic pyrenamines, pyrenediamines, chrysenamines, and chrysenediamines are defined analogously, with the diarylamino groups on the pyrene preferably being bonded in the 1-position or 1,6-position, respectively. Further preferred dopants are indenofluorenamines or -diamines, for example according to WO 2006 / 108497 or WO 2006 / 122630, benzoindenofluorenamines or -diamines, for example according to WO 2008 / 006449, and dibenzoindenofluorenamines or -diamines, for example according to WO 2007 / 140847, as well as the indenofluorene derivatives with fused aryl groups disclosed in WO 2010 / 012328. Also preferred are the pyrene-arylamines disclosed in WO 2012 / 048780.

[0085] In addition to the compounds of formula (If), (Ik) or (Il), materials of various classes of substances can be used as matrix materials, preferably for fluorescent dopants. Preferred matrix materials are selected from the classes of oligoarylenes (e.g. 2,2',7,7'-tetraphenylspirobifluorene according to EP 676461 or dinaphthylanthracene), in particular oligoarylenes containing condensed aromatic groups, oligoarylenevinylenes (e.g. DPVBi or spiro-DPVBi according to EP 676461), polypodal metal complexes (e.g. according to WO 2004 / 081017), hole-conducting compounds (e.g. according to WO 2004 / 058911), electron-conducting compounds, in particular ketones, phosphine oxides, sulfoxides, etc. (e.g. according to WO 2005 / 084081 and WO 2005 / 084082), atropisomers (e.g. according to WO 2006 / 048268), boronic acid derivatives (e.g. according to WO 2006 / 117052) or benzanthracenes (e.g. according to WO 2008 / 145239).Particularly preferred matrix materials are selected from the classes of oligoarylenes containing naphthalene, anthracene, benzanthracene and / or pyrene or atropisomers of these compounds, oligoarylenevinylenes, ketones, phosphine oxides and sulfoxides. Very particularly preferred matrix materials are selected from the classes of oligoarylenes containing anthracene, benzanthracene, benzphenanthrene and / or pyrene or atropisomers of these compounds. An oligoarylene in the sense of this invention is understood to mean a compound in which at least three aryl or

[0086] Arylene groups are bonded to one another. Also preferred are the anthracene derivatives disclosed in WO 2006 / 097208, WO 2006 / 131192, WO 2007 / 065550, WO 2007 / 110129, WO 2007 / 065678, WO 2008 / 145239, WO 2009 / 100925, WO 2011 / 054442, and EP 1553154, as well as the pyrene compounds disclosed in EP 1749809, EP 1905754, and US 2012 / 0187826. Preferred matrix materials for phosphorescent dopants, in addition to the compounds of the formula (If), (Ik) or (II), are aromatic ketones, aromatic phosphine oxides or aromatic sulfoxides or sulfones, e.g. according to WO 2004 / 013080, WO 2004 / 093207, WO 2006 / 005627 or WO 2010 / 006680, triarylamines, carbazole derivatives, e.g. CBP (N,N-bis-carbazolylbiphenyl) or the carbazole derivatives disclosed in WO 2005 / 039246, US 2005 / 0069729, JP 2004 / 288381, EP 1205527 or WO 2008 / 086851, indolocarbazole derivatives, e.g. B. according to WO 2007 / 063754 or WO 2008 / 056746, indenocarbazole derivatives, e.g. B. according to WO 2010 / 136109, WO 2011 / 000455 or WO 2013 / 041176, azacarbazole derivatives, e.g.according to EP 1617710, EP 1617711, EP 1731584, JP 2005 / 347160, bipolar matrix materials, e.g. according to WO 2007 / 137725, silanes, e.g. according to WO 2005 / 111172, azaboroles or boronate esters, e.g. according to WO 2006 / 117052, triazine derivatives, e.g. according to WO 2010 / 015306, WO 2007 / 063754 or WO 2008 / 056746, zinc complexes, e.g. according to EP 652273 or WO 2009 / 062578, diazasilole or tetraazasilole derivatives, e.g. B. according to WO 2010 / 054729, diazaphosphole derivatives, e.g. according to WO 2010 / 054730, bridged carbazole derivatives, e.g. according to US 2009 / 0136779, WO 2010 / 050778, WO 2011 / 042107, WO 2011 / 088877 or WO 2012 / 143080, triphenylene derivatives, e.g. according to WO 2012 / 048781, or lactams, e.g. according to WO 2011 / 116865 or WO 2011 / 137951.

[0087] Suitable charge transport materials, such as those used in hole injection or

[0088] Hole transport layer or electron blocking layer or in the electron transport layer of the organic electroluminescent device according to the invention, in addition to the compounds of the formula (If), (Ik) or (II), for example the compounds disclosed in Y. Shirota et al., Chem. Rev. 2007, 107(4), 953-1010 or other materials as used in these layers according to the prior art.

[0089] All materials known in the art for electron-transport materials in the electron-transport layer can be used as materials for the electron-transport layer. Particularly suitable are aluminum complexes, for example Alq 3 , zirconium complexes, for example Zrq 4 , benzimidazole derivatives, triazine derivatives, pyrimidine derivatives, pyridine derivatives, pyrazine derivatives, quinoxaline derivatives, quinoline derivatives, oxadiazole derivatives, aromatic ketones, lactams, boranes, diazaphosphole derivatives, and phosphine oxide derivatives. Further suitable materials are derivatives of the above-mentioned compounds, as disclosed in JP 2000 / 053957, WO 2003 / 060956, WO 2004 / 028217, WO 2004 / 080975, and WO 2010 / 072300.

[0090] Particularly preferred hole transport materials are the compounds of formula (If), (Ik) or (II). Preferred hole transport materials that can be used in a hole transport, hole injection or electron blocking layer in the electroluminescent device according to the invention are indenofluorenamine derivatives (e.g. according to WO 06 / 122630 or WO 06 / 100896), the amine derivatives disclosed in EP 1661888, hexaazatriphenylene derivatives (e.g. according to WO 01 / 049806), amine derivatives with condensed aromatics (e.g. according to US 5,061,569), the amine derivatives disclosed in WO 95 / 09147, monobenzoindenofluorenamines (e.g. according to WO 08 / 006449), dibenzoindenofluorenamines (e.g. according to WO 07 / 140847), spirobifluorenamines (e.g. according to WO 2012 / 034627 or the not yet published EP 12000929.5), fluorene amines (e.g. according to the not yet published applications EP 12005369.9, EP 12005370.7 and EP 12005371.5), spiro-dibenzopyran amines (e.g.according to WO 2013 / 083216) and dihydroacridine derivatives (e.g. according to WO 2012 / 150001).

[0091] Metals with a low work function, metal alloys, or multilayer structures made of different metals are preferred as the cathode of the electronic device, such as alkaline earth metals, alkali metals, main group metals, or lanthanides (e.g., Ca, Ba, Mg, Al, In, Mg, Yb, Sm, etc.). Alloys made of an alkali or alkaline earth metal and silver, for example, an alloy of magnesium and silver, are also suitable. In multilayer structures, in addition to the metals mentioned, other metals with a relatively high work function, such as Ag or Al, can also be used. Combinations of the metals, such as Ca / Ag, Mg / Ag, or Ba / Ag, are then generally used. It may also be preferable to introduce a thin intermediate layer of a material with a high dielectric constant between a metallic cathode and the organic semiconductor.Suitable materials for this purpose include alkali metal or alkaline earth metal fluorides, as well as the corresponding oxides or carbonates (e.g., LiF, Li 2 O, BaF 2 , MgO, NaF, CsF, Cs 2 CO 3 , etc.). Lithium quinolinate (LiQ) can also be used. The thickness of this layer is preferably between 0.5 and 5 nm.

[0092] Materials with a high work function are preferred as the anode. The anode preferably has a work function greater than 4.5 eV vs. vacuum. On the one hand, metals with a high redox potential, such as Ag, Pt or Au, are suitable for this purpose. On the other hand, metal / metal oxide electrodes (e.g. Al / Ni / NiO x , Al / PtO x ) may also be preferred. For some applications, at least one of the electrodes must be transparent or partially transparent to enable either the irradiation of the organic material (organic solar cell) or the coupling out of light (OLED, O-LASER). Preferred anode materials here are conductive mixed metal oxides. Indium tin oxide (ITO) or indium zinc oxide (IZO) are particularly preferred. Also preferred are conductive, doped organic materials, in particular conductive doped polymers.Furthermore, the anode can also consist of several layers, for example an inner layer of ITO and an outer layer of a metal oxide, preferably tungsten oxide, molybdenum oxide or vanadium oxide.

[0093] During manufacture, the electronic device is structured, contacted and finally sealed accordingly (depending on the application), since the lifetime of the devices according to the invention is shortened in the presence of water and / or air.

[0094] In a preferred embodiment, the electronic device according to the invention is characterized in that one or more layers are coated using a sublimation process. The materials are vapor-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.

[0095] Also preferred is an organic electroluminescent device, characterized in that one or more layers are coated using the OVPD (Organic Vapor Phase Deposition) process or by means of carrier gas sublimation. The materials are applied at a pressure between 10 -5 mbar and 1 bar. 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 (e.g., BMS Arnold et al., Appl. Phys. Lett. 2008, 92, 053301).

[0096] Also preferred is an organic electroluminescent device, characterized in that one or more layers are produced from solution, such as by spin coating, or by any printing process, such as screen printing, flexographic printing, nozzle printing, or offset printing, but particularly preferably LITI (Light Induced Thermal Imaging, thermal transfer printing) or inkjet printing. Soluble compounds according to formula (If), (Ik), or (II) are required for this purpose. High solubility can be achieved by suitable substitution of the compounds.

[0097] It is further preferred that, to produce an organic electroluminescent device according to the invention, one or more layers are applied from solution and one or more layers are applied by a sublimation process.

[0098] The invention thus further relates to a method for producing the electronic device according to the invention, characterized in that at least one organic layer is applied by vapor deposition or from solution.

[0099] According to the invention, the electronic devices comprising one or more compounds according to formula (If), (Ik) or (II) can be used in displays, as light sources in lighting applications and as light sources in medical and / or cosmetic applications (e.g. light therapy). Embodiments for a better understanding of the invention, the compounds shown, with the exception of the compounds 6o and 6s shown below with the precursor compound Int-5c, do not fall under the invention A) Synthesis examples:

[0100] Unless otherwise stated, the following syntheses are carried out under a protective gas atmosphere in dried solvents. The metal complexes are also handled in the absence of light. The solvents and reagents can be obtained from Sigma-ALDRICH or ABCR, for example. The information in square brackets for known chemical compounds refers to the CAS number. Synthesis of precursors: Example Int-1: 3-Dibenzofuran-4-yl-9-phenyl-9H-carbazole

[0101]

[0102] 43.35 g (204.1 mmol) of dibenzofuran-4-boronic acid, 60 g (186.2 mmol) of 3-bromo-9-phenyl-9H-carbazole, and 118.4 ml (237 mmol) of Na2CO3 (2M solution) are suspended in 180 mL of toluene, 180 mL of ethanol, and 150 mL of water. 3.9 g (3.3 mmol) of Pd(PPh3)4 are added to this suspension, and the reaction mixture is heated under reflux for 16 h. After cooling, the organic phase is separated, filtered through silica gel, washed three times with 200 mL of water, and then evaporated to dryness. The residue is recrystallized from toluene. The yield is 75.7 g (181 mmol), corresponding to 96% of theory.

[0103] The following compounds can be obtained analogously: Educt 1 Educt 2 product exploitation Int-1a [89827-45-2] [36809-26-4 ] 90% Int-1b [89827-45-2] 92% Int-1c [89827-45-2] [57102-42-8] 89% Int-1d [89827-45-2] [63524-03-8] 92% Int-1e [89827-45-2] [94994-62-4 ] 86% Int-1f [89827-45-2] 96% Int-1g [89827-45-2] [313050-71-4 ] 90% Example Int-2: Bis-biphenyl-4-yl-dibenzofuran-4-yl-amine

[0104]

[0105] A degassed solution of 43.92 g (176 mmol) of 4-bromo-dibenzofuran and 47.41 g (148 mmol) of bis-biphenyl-4-yl-amine in 700 mL of toluene is saturated with N 2 for 30 min. The mixture is then first treated with 2.51 mL (10.3 mmol) of 1M solution in toluene P( t Bu) 3 , then treated with 1.66 g (7.3 mmol) of palladium(II) acetate and then added with 21.24 g (222 mmol) of NaOtBu in the solid state. The reaction mixture is heated under reflux for 6 h. After cooling to room temperature, 500 mL of water is carefully added. The aqueous phase is washed with 3 x 70 mL of toluene, dried over MgSO 4 and the solvent removed in vacuo. The crude product is then purified by chromatography on silica gel using heptane / acetic acid ester (20:1). The yield is 70.91 g (142.8 mmol), corresponding to 94% of theory.

[0106] The following compounds can be obtained analogously: Educt 1 Educt 2 product yield Int-2a [89827-45-2] [103012-26-6 ] 90% Int-2b [89827-45-2] [1257220-47-5] 87% Int-2c [89827-45-2] 83% Int-2d [89827-45-2] [1024598-06-8] 57% Int-2e [89827-45-2] 86% Int-2f [89827-45-2] [1386375-16-1 ] 85% Example Int-3: 9-Phenyl-3-(6-trimethylsilanyl-dibenzofuran-4-yl)-9H-carbazole

[0107]

[0108] A solution of 49 g (121 mmol) of 3-dibenzofuran-4-yl-9-phenyl-9H-carbazole and 28 g (242 mmol) of TMEDA in 1000 mL of THF, cooled to 15 °C, was treated dropwise with 127 mL (225.4 mmol) of n-butyllithium (2.5 M in hexane). The reaction mixture was stirred at room temperature for 3 h, then cooled to 0 °C. 26 g (242 mmol) of chlorotrimethylsilane was added dropwise over 30 min. The mixture was stirred at room temperature for 16 h. The solvent was then removed in vacuo, and the residue was purified by chromatography on silica gel using toluene:dichloromethane 2:1. Yield: 34 g (72 mmol), 60% of theory.

[0109] The following compounds can be obtained analogously: Educt 1 Product yield Int-3a 81% Int-3b 88% Int-3c 84% Int-3d 88% Int-3e 70% Int-3f 86% Int-3g 79% Int-3h 75% Int-3i 72% Int-3j 81% Int-3k 83% Int-3l 88% Int-3m 84% Example Int-4: B-[6-(Phenyl-9H-carbazol-3-yl)-4-dibenzofuranyl]-boronic acid

[0110]

[0111] Under protective gas, 21 g (86 mmol) of bromine tribromide is added dropwise to a solution of 34 g (72 mmol) of B-[6-(phenyl-9H-carbazol-3-yl)-4-dibenzofuranyl]boronic acid in 500 ml of dichloromethane and stirred at room temperature for 10 h. The mixture is then slowly treated with a little water, and the precipitated residue is filtered off and washed with heptane. The yield is 28 g (62 mmol), corresponding to 86% of theory.

[0112] The following compounds can be obtained analogously: Educt 1 product yield Int-4a 82% Int-4b 81% Int-4c 87% Int-4d 86% Int-4e 79% Int-4f 78% Int-4g 83% Int-4h 85% Int-4i 78% Int-4j 84% Int-4k 87% Int-4l 80% Int-4m 86% Example Int-5: B-[6-(Phenyl-9H-carbazol-3-yl)-4-dibenzofuranyl]-boronic acid

[0113]

[0114] 9 g (32 mmol) of B,B'-4,6-dibenzofurandiylbisboronic acid, 15 g (31.6 mmol) of 3-bromo-9-phenyl-9H-carbazole, and 31 ml (63 mmol) of Na2CO3 (2M solution) are suspended in 120 mL of toluene and 120 mL of ethanol. 0.73 g (0.63 mmol) of Pd(PPh3)4 is added to this suspension, and the reaction mixture is heated under reflux for 16 h. After cooling, the organic phase is separated, filtered through silica gel, washed three times with 200 mL of water, and then evaporated to dryness. The residue is recrystallized from toluene. The yield is 11.1 g (24 mmol), corresponding to 70% of theory.

[0115] The following compounds can be obtained analogously: Educt 1 Educt 2 product yield Int-5b [480438-76-4] [1153-85-1] 69% Int-5c [862159-27-1 ] 74% Synthesis of other compounds: Example 6: Biphenyl-4-yl-(9,9-dimethyl-9H-fluoren-2-yl)-{4-[6-(9-phenyl-9H-carbazol-3-yl)-dibenzofuran-4-yl]-phenyl}-amine

[0116]

[0117] 32.1 g (70 mmol) of B-[6-(phenyl-9H-carbazol-3-yl)-4-dibenzofuranyl]boronic acid, 36.12 g (70 mmol) of biphenyl-4-yl-(4-bromophenyl)-(9,9-dimethyl-9H-fluoren-2-yl)amine, and 78.9 ml (158 mmol) of Na 2 CO 3 (2M solution) are suspended in 120 mL of ethanol and 100 mL of water. 1.3 g (1.1 mmol) of Pd(PPh 3 ) 4 are added to this suspension, and the reaction mixture is heated under reflux for 16 h. After cooling, the mixture is treated with dichloromethane, the organic phase is separated, and the mixture is filtered through silica gel. The yield is 40 g (47 mmol), corresponding to 67.8% of theory. The residue is recrystallized from toluene and finally sublimed under high vacuum (p = 5 x 10 -6 < mbar). The purity is 99.9%.

[0118] The following compounds can be obtained analogously: Educt 1 Educt 2 product 6a 6b 6c 6d 6e 6f 6g 6h 6i 6j 6k 6l 6n 6o 6p 6r 6s 6t yield 6a 60 % 6b 77% 6c 82% 6d 78% 6e 84% 6f 63% 6g 52% 6h 71% 6i 69% 6j 73% 6k 52% 6l 48% 6n 56% 6o 67% 6p 69% 6r 45% 6s 64% 6t 60 % Synthesis of precursors: Example Int-7: 3-(6-Bromo-dibenzofuran-4-yl)-9-phenyl-9H-carbazole

[0119]

[0120] 10.43 g (32 mmol) of B-(9-phenyl-9H-carbazol-3-yl)boronic acid, 8.9 g (31.6 mmol) of 4,6-dibromodibenzofuran, and 31 ml (63 mmol) of Na2CO3 (2M solution) are suspended in 120 mL of toluene and 120 mL of ethanol. 0.73 g (0.63 mmol) of Pd(PPh3)4 is added to this suspension, and the reaction mixture is heated under reflux for 16 h. After cooling, the organic phase is separated, filtered through silica gel, washed three times with 200 mL of water, and then evaporated to dryness. The residue is recrystallized from toluene. The yield is 11.4 g (23 mmol), corresponding to 73% of theory.

[0121] The following compounds can be obtained analogously: Educt 1 Educt 2 product yield Int-7a 51% Int-7b [69414-97-7] [854952-58-2] 65% Int-7c [1262398-42-4 ] [854952-58-2] 69% Int-7d [176646-34-7 ] [1001911-63-2] 67% Int-7e [201138-91-2] [1391729-62-6] 62% Int-7f [854952-58-2] 62% Int-7g [553663-65-3] [1001911-63-2] 61% Int-7h [905702-33-2] [854952-58-2] 64% Int-7i [502764-54-7] [854952-58-2] 66% Int-7j [201138-91-2] [943836-24-6 ] 62% Int-7k [201138-91-2] 65% Synthesis of other compounds:

[0122] Analogously, the following compounds can be obtained by double addition with corresponding boronic acids: Educt 1 Educt 2 product 7l [201138-91-2] [943836-24-6 ] 7m [201138-91-2] [1265177-27-2 ] 7n [943836-24-6 ] 7o [943836-24-6 ] 7p 7q 7r 7s 7t [943836-24-6 ] 7u [1265177-27-2 ] 7v [201138-91-2] [201802-67-7] yield 7l 52% 7m 67% 7n 80% 7o 79% 7p 58% 7q 78% 7r 87% 7s 87% 7t 83% 7u 80% 7v 87% Example 8: Bis-biphenyl-4-yl-(4-{1-[3-eth-(Z)-ylidene-7-(9-phenyl-9H-carbazol-3-yl)-3H-benzofuran-(2Z)-ylidene]-ethyl}-phenyl)-amine

[0123]

[0124] 87 g (180.1 mmol) of 3-(6-bromo-dibenzofuran-4-yl)-9-phenyl-9H-carbazole, 79 g (180.7 mmol) of B-[4-[bis([1,1'-biphenyl]-4-yl]amino]phenylboronic acid] and 38.3 g (180.7 mmol) of potassium phosphate are suspended in 500 ml of toluene, 250 ml of 1,4-dioxane and 120 ml of water. 1.3 g (4.1 mmol) of tri(o-tolyl)phosphine and then 461 mg (2 mmol) of palladium(II) acetate are added to the mixture and the reaction mixture is heated under reflux for 48 h. After cooling, the organic phase is separated, washed three times with 100 ml of water each time and concentrated. After column chromatographic purification (SiO 2 , n After evaporation of the resulting foam (3 / 1 heptane / dichloromethane), the resulting foam is dissolved in dichloromethane and precipitated with ethanol. The residue is recrystallized from toluene and dichloromethane and then sublimed under high vacuum (p = 5 x 10 -5 < mbar). Yield: 129 g (160 mmol), 90%. Purity: approximately 99% by HPLC.

[0125] The following compounds can be obtained analogously: Educt 1 Educt 2 product 8a [1265177-27-2 ] 8b [201802-67-7] 8c [201802-67-7] 8d [1265177-27-2 ] 8e [1265177-27-2 ] 8f [201802-67-7] 8g 8h 8i [943836-24-6 ] 8j 8k [943836-24-6 ] 8l 8m [1084334-86-0 ] yield 8a 68% 8b 73% 8c 86% 8d 65% 8e 63% 8f 79% 8g 62% 8h 64% 8i 65% 8j 64% 8k 66% 8l 62% 8m 65% Example 9: Bis-biphenyl-4-yl-[4-(9,9'-diphenyl-9H,9'H-[1,2']bicarbazolyl-8-yl)-phenyl]-amine

[0126]

[0127] 40 g (49.75 mmol) of bis-biphenyl-4-yl-[4-(9'-phenyl-9H,9'H-[1,2']bicarbazolyl-8-yl)-phenyl]-amine and 16.7 g (74.62 mmol) of bromobenzene were dissolved in toluene and degassed via a protective gas inlet. 4.9 mL (4.9 mmol, 1 M solution in toluene) of tri-tert-butylphosphine, 633.7 mg (2.82 mmol) of Pd(OAc) 2 , and 10.2 g (105.87 mmol) of t-BuONa were then added. The solids were degassed beforehand, the reaction mixture was subsequently degassed, and then stirred under reflux for 12 h. The warm reaction solution was filtered through Alox B (activity grade 1), washed with water, dried, and concentrated. The yield is 29.9 g (33.98 mmol), corresponding to 68% of theory. The residue is recrystallized from toluene and finally sublimed under high vacuum (p = 5 x 10 -5 < mbar). The purity is 99.9%.

[0128] The following compounds can be obtained analogously: Educt 1 Educt 2 product 9a 9b 9c 9d 9e yield 9a 79% 9b 90% 9c 79% 9d 90% 9e 79% Synthesis of precursors: Example Int-10 : Bis-biphenyl-4-yl-(6-bromo-dibenzofuran-4-yl)-amine

[0129]

[0130] A mixture of 16.3 g (50 mmol) of 4,6-dibromo-dibenzofuran, 19.2 g (60 mmol) of bis-biphenyl-4-yl-amine, 7.7 g (80 mmol) of sodium tert-butoxide, 1.4 g (5 mmol) of tricyclohexylamine, 561 mg (2.5 mmol) of palladium(II) acetate, and 300 ml of mesitylene is heated under reflux for 24 h. After cooling, 200 ml of water is added, the mixture is stirred for 30 min, the organic phase is separated, filtered through a short bed of Celite, and the solvent is then removed in vacuo. The residue is recrystallized five times from DMF and finally fractionally sublimed twice (p approx. 10 -6 < mbar). Yield: 22.9 g (40 mmol), 81%; Purity: 99.9% by HPLC.

[0131] The following compounds are obtained analogously: e.g. reactant product yield Int-10a [201138-91-2] [1290039-85-8] 65 % Int-10b [201138-91-2] [1300028-94-7 ] 69% Int-10c [201 138-91-2] [1198395-24-2] 76 % Int-10d [201138-91-2] [86-74-8 ] 75 % Int-10e [669773-34-6] [1198395-24-2] 71% Synthesis of compounds according to the invention:

[0132] Analogously, the following compounds can be obtained by second addition with corresponding boroacids: e.g. reactant product 10f [1290039-85-8] 10g [1300028-94-7 ] 10h [1198395-24-2] 10i [86-74-8 ] 10j [1198395-24-2] e.g. yield 10f 65 % 10g 66% 10h 76 % 10i 75 % 10j 77% B) Device examples: Production of OLEDs

[0133] The following OLEDs and OLEDs according to the state of the art are manufactured according to a general process according to WO 04 / 058911, which is adapted to the conditions described here (layer thickness variation, materials).

[0134] In the following non-inventive examples E1 to E5 and in the reference examples V1 to V3, the data for various OLEDs are presented. Glass plates coated with structured ITO (indium tin oxide) with a thickness of 50 nm are used as substrates. The OLEDs essentially have the following layer structure: substrate / p-doped hole transport layer (HTL1) / hole transport layer (HTL2) / p-doped hole transport layer (HTL3) / hole transport layer (HTL4) / emission layer (EML) / electron transport layer (ETL) / electron injection layer (EIL) and finally a cathode. The cathode is formed by a 100 nm thick aluminum layer. The materials required to produce the OLEDs are shown in Table 1, and the various device structures are shown in Table 2.

[0135] All materials are thermally evaporated in a vacuum chamber. The emission layer always consists of at least one matrix material (host material) and one emitting dopant (emitter), which is added to the matrix material(s) by co-evaporation in a specific volume fraction. A specification such as H1:SEB1(5%) means that the H1 material is present in the layer at a volume fraction of 95% and SEB1 at a volume fraction of 5%. Similarly, the electron transport layer or the hole injection layer can also consist of a mixture of two materials.

[0136] OLEDs are characterized as standard. For this purpose, the electroluminescence spectra, current efficiency (measured in cd / A), power efficiency (measured in lm / W), and external quantum efficiency (EQE, measured in percent) are determined as a function of luminance, calculated from current-voltage-luminance curves (IUL curves) assuming a Lambertian radiation pattern, as well as the lifetime. The electroluminescence spectra are determined at a luminance of 1000 cd / m², and the CIE 1931 x and y color coordinates are calculated from them. The EQE @ 10 mA / cm² refers to the external quantum efficiency at a current density of 10 mA / cm². LD80 @ 50 mA / cm 2< (lifetime) is the time until the brightness of the OLED has decreased to 80% of the initial intensity at a starting brightness at a constant current of 50 mA / cm 2<. Table 1: Structures of the materials used F4TCNQ HIM1 H1 SEB1 H2 TEG ETM LiQ HTM1 HTMV1 HTMV2 HTM2 HTM3 HTM4 Table 2: Structure of the devices e.g. HTL1 HTL2 HTL3 HTL4 EML ETL URGENT Thickness / nm Thickness / nm Thickness / nm Thickness / nm Thickness / nm Thickness / nm Thickness / nm V1 HIM1: F4TCNQ (3%) 20 nm HIM1 155 nm HTMV1: F4TCNQ (3%) 20 nm HTMV1 20 nm H1:SEB1(5%) 20 nm ETM(50%): LiQ(50%) 30 nm LiQ 1 nm E1 HIM1: F4TCNQ (3%) 20 nm HIM1 155 nm HTM1: F4TCNQ (3%) 20 nm HTM1 20 nm H1:SEB1(5%) 20 nm ETM(50%): LiQ(50%) 30 nm LiQ 1 nm V2 HIM1: F4TCNQ (3%) 20 nm HIM1 160 nm HTMV1: F4TCNQ (3%) 20 nm HTMV1 70 nm H2:TEG(10%) 30 nm ETM(50%): LiQ(50%) 40 nm LiQ 1 nm E2 HIM1: F4TCNQ (3%) 20 nm HIM1 160 nm HTM1: F4TCNQ (3%) 20 nm HTM1 70 nm H2:TEG(10%) 30 nm ETM(50%): LiQ(50%) 40 nm LiQ 1 nm V3 HIM1: F4TCNQ (3%) 20 nm HIM1 155 nm HTMV2: F4TCNQ (3%) 20 nm HTMV2 20 nm H1:SEB1(5%) 20 nm ETM(50%): LiQ(50%) 30 nm LiQ 1 nm E3 HIM1: F4TCNQ (3%) 20 nm HIM1 155 nm HTM2: F4TCNQ (3%) 20 nm HTM2 20 nm H1:SEB1(5%) 20 nm ETM(50%): LiQ(50%) 30 nm LiQ 1 nm E4 HIM1: F4TCNQ (3%) 20 nm HIM1 155 nm HTM3: F4TCNQ (3%) 20 nm HTM3 20 nm H1:SEB1(5%) 20 nm ETM(50%): LiQ(50%) 30 nm LiQ 1 nm E5 HIM1: F4TCNQ (3%) 20 nm HIM1 155 nm HTM4: F4TCNQ (3%) 20 nm HTM4 20 nm H1:SEB1(5%) 20 nm ETM(50%): LiQ(50%) 30 nm LiQ 1 nm Ergebnisse:

[0137] The examples show the use of the compound HTM1 not according to the invention as a hole transport material in a hole transport layer.

[0138] A comparison device V1 is fabricated and compared with device E1. Device V1 has a prior art compound HTMV1 in the hole-transport layer HTL3, while device E1 has a hole-transport material in the hole-transport layer HTL3. Both devices E1 and V1 have a fluorescent compound (SEB1) in the emitting layer.

[0139] The reference device V1 has an external quantum efficiency of 7.8% at a current density of 10 mA / cm 2 < and a lifetime (LD80 @ 50 mA / cm 2 < ) of 290 h. In comparison, the device E1 has both a higher external quantum efficiency of 8.4% at a current density of 10 mA / cm 2 < and a measured lifetime (LD80 @ 50 mA / cm 2 < ) of 320 h.

[0140] A comparison device V2 is fabricated and compared with device E2. Device V2 has a prior art compound HTMV1 in the hole-transport layer HTL3, while device E2 has a compound HTM1 as the hole-transport material in the hole-transport layer HTL3. Both devices E1 and V1 have a phosphorescent compound (TEG) in the emitting layer.

[0141] Compared to a reference device V2, the corresponding device E2 shows both a higher quantum efficiency (@ 2 mA / cm 2< ) of 20.4% compared to the reference device V2 of 19.4% and a longer lifetime (LD80 @ 20 mA / cm 2< ) of 180 h compared to the reference device E2 of 120 h.

[0142] Compared to the reference material HTMV2 (6.2%, 135 h), the materials HTM2 (7.4%, 270 h), HTM3 (8.2%, 300 h) and HTM4 (7.2%, 210 h) show better external quantum efficiencies at 10 mA / cm 2< and a better lifetime (LD80 at 50 mA / cm 2< ) when used as hole transport material in a blue fluorescent OLED.

[0143] The examples show the surprising advantages of using the compounds HTM1 to HTM4 with two arylamino groups or one arylamino group and one carbazole group bound "face to face" to a central linker group, compared to the use of a compound with a single arylamino group HTMV1 or the use of the diamino compound HTMV2.

[0144] The examples show advantages when using the materials as hole transport material in combination with fluorescent and phosphorescent emitting layers.

[0145] Compounds with a similarly advantageous effect can also be used as matrix materials in the emitting layer. C) Messung der Glasübergangstemperatur

[0146] TG measurements were performed according to standard procedures (performed on a TA Instruments Q2000 series DSC instrument). The following results were obtained (Table 3). Tabelle 3: T G -Messungen Verbindung Glasübergangstemperatur T G HTMV1 111 °C HTM1 155 °C HTM2 148 °C HTM3 113 °C HTM4 142 °C

[0147] The material HTM1 was found to exhibit a high glass transition temperature of 155 °C, which is very advantageous for use in OLEDs. Compounds HTM2 and HTM4 also exhibit high glass transition temperatures. In contrast, the glass transition temperature (TG) of the reference compound HTMV1 is significantly lower.

Claims

1. Electronic device, comprising anode, cathode and at least one organic layer which comprises at least one compound of the formula (I-f), (I-k) or (I-I) where, for formula (I-f), a group selected from the groups of the formulae is bonded at the positions denoted by * and where, for formulae (I-k) and (I-l), a group selected from the groups of the formulae is bonded at the positions denoted by *, where: the compounds may be substituted by radicals R1 at all free positions on the formulae (I-f), (I-k) and (I-l), and Ar1 is selected on each occurrence, identically or differently, from aryl or heteroaryl groups having 6 to 13 aromatic ring atoms, which may be substituted by one or more radicals R1; Ar2 is selected on each occurrence, identically or differently, from aryl or heteroaryl groups having 6 to 13 aromatic ring atoms, which may be substituted by one or more radicals R1; X is selected on each occurrence, identically or differently, from C(R1)2, Si(R1)2, C=O, O, S, S=O, SO2 and NR1; Y is a single bond; R1 is on each occurrence, identically or differently, H, D, F, C(=O)R2, CN, Si(R2)3, N(R2)2, P(=O)(R2)2, S(=O)R2, S(=O)2R2, a straight-chain alkyl or alkoxy group having 1 to 20 C atoms or a branched or cyclic alkyl or alkoxy group having 3 to 20 C atoms or an alkenyl or alkynyl group having 2 to 20 C atoms, where the above-mentioned groups may in each case be substituted by one or more radicals R2 and where one or more CH2 groups in the above-mentioned groups may be replaced by -R2C=CR2-, -C≡C-, Si(R2)2, C=O, C=S, C=NR2, -C(=O)O-, -C(=O)NR2-, NR2, P(=O)(R2), -O-, -S-, SO or SO2 and where one or more H atoms in the above-mentioned groups may be replaced by D, F or CN, or an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R2, or an aryloxy or heteroaryloxy group having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R2, where two or more radicals R1 may be linked to one another and may form a ring; R2 is on each occurrence, identically or differently, H, D, F or an aliphatic, aromatic or heteroaromatic organic radical having 1 to 20 C atoms, in which, in addition, one or more H atoms may be replaced by D or F; two or more substituents R2 may be linked to one another and may form a ring; n is on each occurrence, identically or differently, 0, 1, 2, 3 or 4; i is on each occurrence, identically or differently, 0 or 1; k is on each occurrence, identically or differently, 0 or 1, where at least one index k per group of the formula (C-1) must be equal to 1; and where a group selected from groups of the formulae (A-1) or (A-2) must be bonded at at least one of the positions denoted by *, and where furthermore no condensed aryl or heteroaryl group having 14 or more aromatic ring atoms is present in the compound.

2. Electronic device according to Claim 1, characterised in that it corresponds to formula (I-f), and that a group selected from groups of the formula (A-2) is bonded at both positions denoted by *.

3. Electronic device according to Claim 1 or 2, characterised in that the group Ar1 is selected on each occurrence, identically or differently, from aryl or heteroaryl groups having 6 to 10 aromatic ring atoms, which may be substituted by one or more radicals R1.

4. Electronic device according to one or more of Claims 1 or 3, characterised in that the group Ar2 is selected on each occurrence, identically or differently, from aryl or heteroaryl groups having 6 to 10 aromatic ring atoms, which may be substituted by one or more radicals R1.

5. Electronic device according to one or more of Claims 1 to 4, characterised in that R1 is on each occurrence, identically or differently, H, D, F, CN, Si(R2)3, N(R2)2, a straight-chain alkyl or alkoxy group having 1 to 20 C atoms or a branched or cyclic alkyl or alkoxy group having 3 to 20 C atoms, where the above-mentioned groups may in each case be substituted by one or more radicals R2 and where one or more CH2 groups in the above-mentioned groups may be replaced by -C≡C-, -R2C=CR2-, Si(R2)2, C=O, C=NR2, -NR2-, -O-, -S-, -C(=O)O- or -C(=O)NR2-, or is an aromatic or heteroaromatic ring system having 5 to 20 aromatic ring atoms, which may be substituted by one or more radicals R2, where two or more radicals R1 may be linked to one another and may form a ring.

6. Electronic device according to one or more of Claims 1, 3 to 5, characterised in that the index n is on each occurrence, identically or differently, 0 or 1.

7. Electronic device according to one or more of Claims 1 to 6, characterised in that the index i is on each occurrence equal to 0.

8. Electronic device according to one or more of Claims 1 to 7, characterised in that it corresponds to a formula selected from the formulae (I-k) and (I-l).

9. Electronic device according to one or more of Claims 1 to 8, characterised in that the compounds of the formulae (I-f), (I-k) and (I-I) contain no further arylamino groups in addition to the groups (A-1), (A-2), (C-1) and (C-2) according to Claim 1.

10. Electronic device according to one or more of Claims 1 to 9, characterised in that the compounds of the formulae (I-f), (I-k) and (I-I) contain no further carbazole groups in addition to the groups (A-1), (A-2), (C-1) and (C-2) according to Claim 1.

11. Electronic device according to one or more of Claims 1 to 10, characterised in that the compounds are of the formulae (I-k) and (I-I), where a group selected from the groups of the formulae (A-1) and (A-2) according to Claim 1 is bonded at the positions denoted by *, and where all other groups are defined as in Claim 1.

12. Electronic device according to one or more of Claims 1 to 11, characterised in that the electronic device is an organic electroluminescent device, OLED.

13. Electronic device according to Claim 12, characterised in that the organic layer comprising the compound of the formula (I-f), (I-k) or (I-I) is a layer having a hole-transporting function or an emitting layer.

14. Use of an electronic device according to one or more of Claims 1 to 13 in displays and / or as light source in lighting applications and / or as light source in medical or cosmetic applications.