COMPOUNDS WITH HETEROATOMS FOR ORGANIC ELECTROLUMINESCENT DEVICES

Description

[0001] The present invention relates to compounds containing heteroatoms for use in electronic devices, in particular in organic electroluminescent devices, and to electronic devices, in particular organic electroluminescent devices, containing these heterocyclic compounds.

[0002] In organic electroluminescent devices, phosphorescent organometallic complexes or fluorescent compounds are often used as emitting materials. In general, electroluminescent devices still have room for improvement.

[0003] WO 2010 / 104047 A1 and WO 2019 / 132506 A1 disclose polycyclic compounds that can be used in organic electroluminescent devices. Compounds according to the present invention are not disclosed. Furthermore, antiaromatic properties of compounds are investigated by Wang et al. in Nature Communications | 8: 1948. However, the use of these compounds in organic electroluminescent devices is not described by Wang et al. Further polycyclic compounds containing a lactam are known from the prior art (for example, in: Nurmukhametov et al., Zhurnal Fizicheskoi Khimii 1967 41, 3017-3022. Shirley et al., J. Org. Chem. 1962, 27, 4421-4424. Nishikawa et al., Chemistry Letters 1996, 25, 113-114. CN 108 017 647 A

[0004] In general, there is still room for improvement in these heterocyclic compounds, for example for use as emitters, especially as fluorescent emitters, particularly with regard to lifetime, color purity, but also with regard to efficiency and operating voltage of the device.

[0005] 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, when used in this device, lead to good device properties, as well as to provide the corresponding electronic device.

[0006] In particular, it is the object of the present invention to provide connections that lead to a long service life, good efficiency and low operating voltage.

[0007] Furthermore, the compounds should have excellent processability, with the compounds particularly showing good solubility.

[0008] A further object of the present invention can be seen in providing compounds suitable for use in phosphorescent or fluorescent electroluminescent devices, particularly as emitters. In particular, it is an object of the present invention to provide emitters suitable for red, green, or blue electroluminescent devices.

[0009] Furthermore, the compounds should lead to devices with excellent color purity, especially when used as emitters in organic electroluminescent devices.

[0010] A further object of the present invention can be seen in providing compounds suitable for use in phosphorescent or fluorescent electroluminescent devices, in particular as matrix materials. In particular, it is an object of the present invention to provide matrix materials suitable for red, yellow, and blue phosphorescent electroluminescent devices.

[0011] Furthermore, the compounds should lead to devices with excellent color purity, especially when used as matrix materials, as hole transport materials or as electron transport materials in organic electroluminescent devices.

[0012] Another task can be seen in providing electronic devices with excellent performance as cost-effectively as possible and in consistent quality

[0013] Furthermore, the electronic devices should be able to be used or adapted for a variety of purposes. In particular, the performance of the electronic devices should be maintained over a wide temperature range.

[0014] Surprisingly, it has been found that certain compounds, described in more detail below, achieve this objective, are highly suitable for use in electroluminescent devices, and lead to organic electroluminescent devices that exhibit very good properties, particularly with regard to lifetime, color purity, efficiency, and operating voltage. These compounds and electronic devices, in particular organic electroluminescent devices, containing such compounds are therefore the subject of the present invention.

[0015] The present invention relates to a compound comprising at least one structure of formula (IIa), preferably a compound according to formula (IIa), where the symbols and indices used are: Z 1< is N; W 1< , W 2< is the same or different on each occurrence and is X 4< or the two radicals W 1< , W 2< together form a group Ar a< , where the group Ar a< formed by the two radicals W 1< , W 2< is linked in the ortho position to the other radicals Y, Z 1<; Y is the same or different on each occurrence and is B(R) or B(Ar b< ); V is the same or different on each occurrence and is a single bond, C(R) 2 , O or S, preferably a single bond or O; Ar a< is the same or different on each occurrence and is an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms which may be substituted by one or more radicals R, here the group Ar a< can form a ring system with Y, U or another group; Ar b< is at each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R,here the group Ar b< can form a ring system with W 1< , X 2< or another group; X 1< is the same or different on each occurrence and is N or CR a< , preferably CR a< with the proviso that no more than two of the groups X 1< , X 2< , X 3< in a cycle are N; X 2< is the same or different on each occurrence and is N or CR b< , preferably CR b< with the proviso that no more than two of the groups X 1< , X 2< , X 3< in a cycle are N; X 3< is the same or different on each occurrence and is N or CR°, preferably CR°, with the proviso that no more than two of the groups X 1< , X 2< , X 3< in a cycle are N; X 4< is the same or different at each occurrence and is N or CR d< , preferably CR d< , with the proviso that no more than two of the groups X 4< in a cycle are N; R, R a< , R b< , R c< , R d< is the same or different at each occurrence and is H, D, OH, F, Cl, Br, I, CN, NO 2 ,N(Ar') 2, N(R') 2, C(=O)N(Ar') 2, C(=O)N(R') 2, C(Ar') 3, C(R 1< ) 3, Si(Ar') 3, Si(R 1< ) 3, B(Ar') 2, B(R 1< ) 2, C(=O)Ar', , a straight chain Alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or an alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 C atoms, where the alkyl, alkoxy, thioalkoxy, alkenyl or alkynyl group may each be substituted by one or more radicals R 1<, where one or more non-adjacent CH 2 groups are substituted by R 1< C=CR 1< , C≡C, Si(R 1< ) 2 , C=O, C=S, C=Se, C=NR 1< , -C(=O)O-, -C(=O)NR 1< -, NR 1< , P(=O)(R 1< ), -O-, -S-, SO or SO 2 may be replaced, or an aromatic or heteroaromatic ring system with 5 to 60 aromatic ring atoms,which may each be substituted by one or more radicals R 1<, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 1<; two radicals R, R a< , R b< , R c< , R d< may also form a ring system with one another or with another group; Ar' is, on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms which may be substituted by one or more radicals R 1<, where two radicals Ar' which are bonded to the same C atom, Si atom, N atom, P atom or B atom may also be bridged to one another by a single bond or a bridge selected from B(R 1< ), C(R 1< ) 2 , Si(R 1< ) 2 , C=O, C=NR 1< , C=C(R 1< ) 2 , O, S, S=O, SO 2 , N(R 1< ), P(R 1< ) and P(=O)R'; R 1< is, identically or differently at each occurrence, H, D, F, Cl, Br, I, CN, NO 2 , N(Ar") 2 , N(R 2< ) 2 , C(=O)Ar", C(=O)R 2< , P(=O)(Ar") 2 ,P(Ar") 2 , B(Ar") 2 , B(R 2< ) 2 , C(Ar") 3 , C(R 2< ) 3 , Si(Ar") 3 , Si(R 2< ) 3 , a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms or an alkenyl group having 2 to 40 C atoms, each of which may be substituted by one or more radicals R 2<, where one or more non-adjacent CH 2 groups are substituted by -R 2< C=CR 2< -, -C≡C-, Si(R 2< ) 2 , C=O, C=S, C=Se, C=NR 2< , -C(=O)O-, -C(=O)NR 2< -, NR 2< , P(=O)(R 2< ), -O-, -S-, SO or SO 2 and where one or more H atoms can be replaced by D, F, Cl, Br, I, CN or NO 2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, each of which can be substituted by one or more radicals R 2<, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which can be substituted by one or more radicals R 2<,or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 2<, or a combination of these systems; two or more, preferably adjacent radicals R 1< may form a ring system with one another, and one or more radicals R 1< may form a ring system with another part of the compound; Ar" is, at each occurrence, identical or different, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 2<, where two radicals Ar" which bond to the same C atom, Si atom, N atom, P atom or B atom may also be linked by a single bond or a bridge, selected from B(R 2< ), C(R 2< ) 2 , Si(R 2< ) 2 , C=O, C=NR 2< , C=C(R 2< ) 2 , O, S, S=O, SO 2 , N(R 2< ), P(R 2< ) and P(=O)R 2< ,be bridged together; R 2< is, at each occurrence, identical or different, selected from the group consisting of H, D, F, CN, an aliphatic hydrocarbon radical having 1 to 20 C atoms or an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, in which one or more H atoms may be replaced by D, F, Cl, Br, I or CN and which may be substituted by one or more alkyl groups each having 1 to 4 carbon atoms, two or more, preferably adjacent, substituents R 2< may form a ring system with one another.

[0016] An aryl group within the meaning of this invention contains 6 to 40 C atoms; a heteroaryl group within the meaning of this invention contains 2 to 40 C atoms and at least one heteroatom, with the proviso that the sum of C 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 understood to be either a simple aromatic ring, i.e. benzene, or a simple heteroaromatic ring, for example pyridine, pyrimidine, thiophene, etc., or a condensed (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 an aromatic ring system.

[0017] An electron-poor heteroaryl group within the meaning of the present invention is a heteroaryl group that has at least one heteroaromatic six-membered ring containing at least one nitrogen atom. Further aromatic or heteroaromatic five-membered rings or six-membered rings can be fused to this six-membered ring. Examples of electron-poor heteroaryl groups are pyridine, pyrimidine, pyrazine, pyridazine, triazine, quinoline, quinazoline, or quinoxaline.

[0018] An aromatic ring system within the meaning of this invention contains 6 to 60 C atoms in the ring system, preferably 6 to 40 C atoms in the ring system. A heteroaromatic ring system within the meaning of this invention contains 2 to 60 C atoms, preferably 3 to 40 C atoms, and at least one heteroatom in the ring system, with the proviso that the sum of C atoms and heteroatoms is at least 5. 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 linked by a non-aromatic unit, such as a C, N or O atom. For example, systems such as fluorene, 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 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 by single bonds.

[0019] In the context of the present invention, an aliphatic hydrocarbon radical or an alkyl group or an alkenyl or alkynyl group which may contain 1 to 20 C atoms and in which individual H atoms or CH 2 groups may be substituted by the abovementioned groups, 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, 2,2,2-trifluoroethyl, ethenyl, propenyl, butenyl, pentenyl, Cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl, ethynyl, propynyl, butynyl, pentinyl, hexynyl, heptynyl or octynyl.Unter einer Alkoxygruppe 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 und 2,2,2-Trifluorethoxy verstanden. Unter einer Thioalkylgruppe mit 1 bis 40 C-Atomen werden insbesondere 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.In general, alkyl, alkoxy, or thioalkyl groups according to the present invention may be straight-chain, branched, or cyclic, wherein one or more non-adjacent CH 2 groups may be replaced by the above-mentioned groups; furthermore, one or more H atoms may 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.

[0020] An aromatic or heteroaromatic ring system with 5 - 60 or 5 to 40 aromatic ring atoms, which may also 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, benzanthracene, phenanthrene, pyrene, chrysene, perylene, fluoranthene, naphthacene, pentacene, benzopyrene, biphenyl, biphenylene, terphenyl, triphenylene, fluorene, spirobifluorene, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis- or trans-indenofluorene, cis- or trans-indenocarbazole, cis- or trans-indolocarbazole, truxene, isotruxene, spirotruxene, spiroisotruxene, 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,Phenothiazin, Phenoxazin, Pyrazol, Indazol, Imidazol, Benzimidazol, Naphthimidazol, Phenanthrimidazol, Pyridimidazol, Pyrazinimidazol, Chinoxalinimidazol, Oxazol, Benzoxazol, Naphthoxazol, Anthroxazol, Phenanthroxazol, Isoxazol, 1,2-Thiazol, 1,3-Thiazol, Benzothiazol, Pyridazin, Hexaazatriphenylen, 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 Gruppen,which are derived from combinations of these systems.,

[0021] For the purposes of this description, 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 with the formal elimination of two hydrogen atoms. This is illustrated by the following scheme.

[0022] Furthermore, the above formulation should also be understood to mean that if one of the two residues represents hydrogen, the second residue binds to the position to which the hydrogen atom was bonded, forming a ring. This is illustrated by the following scheme:

[0023] In a preferred embodiment, the compounds according to the invention can comprise a structure of the formulas (IIb) to (IId), particularly preferably the compounds according to the invention can be selected from the compounds of the formulas (IIb) to (IId), where the symbols Z 1< , W 1< , W 2< , Y, X 1< , X 2< , X 3< and R have the meanings given above, in particular for formula (IIa).

[0024] The structures / compounds of formulas (IIb) and (IIc) are preferred and structures / compounds of formula (IIb) are particularly preferred.

[0025] In a further preferred embodiment, it can be provided that the compounds according to the invention comprise a structure of the formulae (III-1) to (III-56), wherein the compounds according to the invention can particularly preferably be selected from the compounds of the formulae (III-1) to (III-56), where the symbols R, Z 1< , V, Y, X 1< , X 2<, X 3< and X 4< have the meanings given above, in particular for formula (I), and the following applies to the other symbols and indices: Z 2< is B; Y 1< is on each occurrence, identically or differently, O, S, N(Ar'), N(R), C=O, C(R) 2 , Si(R) 2 , C=NR, C=NAr', C=C(R) 2 , B(Ar') or B(R), preferably C(R) 2 , O, S or N(Ar'), where the symbols Ar' and R have the meanings given in claim 1; X 5< is on each occurrence, identically or differently, N or CR e< , preferably N; R e< is the same or different in each occurrence H, D, OH, F, Cl, Br, I, CN, NO 2 , N(Ar') 2 , N(R 1< ) 2 , C(=O)N(Ar') 2 , C(=O)N(R 1< ) 2 , C(Ar') 3 , C(R 1< ) 3 , Si(Ar') 3 , Si(R 1< ) 3 , B(Ar') 2 , B(R 1< ) 2 , C(=O)Ar', C(=O)R 1< , P(=O)(Ar') 2 , P(=O)(R 1< ) 2 , P(Ar') 2 , P(R 1< ) 2 , S(=O)Ar', S(=O)R', S(=O) 2 Ar', S(=O) 2 R 1< , OSO 2 Ar', OSO 2 R 1< , a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or an alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 C atoms, where the alkyl,Alkoxy, thioalkoxy, alkenyl or alkynyl group may each be substituted by one or more radicals R 1<, where one or more non-adjacent CH 2 groups may be replaced by R 1< C=CR 1< , C≡C, Si(R 1< ) 2 , C=O, C=S, C=Se, C=NR 1< , -C(=O)O-, -C(=O)NR 1< -, NR 1< , P(=O)(R 1< ), -O-, -S-, SO or SO 2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may each be substituted by one or more radicals R 1<, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 1< may be substituted; two radicals R e< may also form a ring system with each other or with another group, where the symbols Ar' and R 1< have the meanings given in claim 1. ,

[0026] The structures / compounds of the formulas (III-15) to (III-42) are preferred and structures / compounds of the formulas (III-15) to (III-28) are particularly preferred.

[0027] Preferably, it can be provided that in formulas (IIa) to (IIc) and / or (III-1) to (III-56) not more than four, preferably not more than two groups X 1< , X 2< , X 3< , X 4< and X 5< stand for N, particularly preferably all groups X 1< , X 2< , X 3< , X 4< and X 5< stand for CR a< , CR b< , CR c< , CR d< , CR e<.

[0028] In a further preferred embodiment, it can be provided that the compounds according to the invention comprise a structure of the formulae (IV-1) to (IV-56), wherein the compounds according to the invention can particularly preferably be selected from the compounds of the formulae (IV-1) to (IV-56), where the symbols Z 1< , Y, V, R, Ra< , Rb< , Rc< and Rd< have the meanings given above, in particular for formula (IIa), the symbols Z 2< , Re< and Y 1< have the meanings given above, in particular for formula (III-1) to (III-56), the index I is 0, 1, 2, 3, 4 or 5, preferably 0, 1 or 2, the index m is 0, 1, 2, 3 or 4, preferably 0, 1 or 2 and the index j is 0, 1 or 2, preferably 0 or 1.

[0029] Structures / compounds of the formulas (IV-15) to (IV-42) are preferred and structures / compounds of the formulas (IV-15) to (IV-28) are particularly preferred.

[0030] The sum of the indices j, m and l in structures / compounds of the formulas (IV-1) to (IV-56) is preferably at most 8, particularly preferably at most 6 and particularly preferably at most 4.

[0031] Configurations in which group Z is 1< N and group Y stands for B(Ar b< ), or B(R) can be used advantageously as emitters.

[0032] Configurations in which the group Z 1< N and the group Z 2< stands for B can be used advantageously as emitters.

[0033] In a preferred development of the present invention, it can be provided that at least two radicals R, R a< , R b< , R c< , R d< , R e< form a condensed ring with the further groups to which the two radicals R, R a< , R b< , R c< , R d< , R e< are bonded, wherein the two radicals R, R a< , R b< , R c< , R d< , R e< form at least one structure of the formulas (RA-1) to (RA-12) where R 1< has the meaning explained above, the dashed bonds represent the bonding sites through which the two radicals R, R a< , R b< , R c< , R d< , R e< bond, and the other symbols have the following meaning: Y 2< is, identically or differently at each occurrence, C(R 1< ) 2 , (R 1< ) 2 CC(R 1< ) 2 , (R 1< )C=C(R 1< ), NR 1< , NAr', O or S, preferably C(R 1< ) 2 , (R 1< ) 2 CC(R 1< ) 2 , (R 1< )C=C(R 1< ), O or S;R f< is, on each occurrence, identically or differently, F, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or an alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 C atoms, where the alkyl, alkoxy, thioalkoxy, alkenyl or alkynyl group may each be substituted by one or more radicals R 2<, where one or more non-adjacent CH 2 groups are substituted by R 2< C=CR 2< , C=C, Si(R 2< ) 2 , C=O, C=S, C=Se, C=NR 2< , -C(=O)O-, -C(=O)NR 2< -, NR 2< , P(=O)(R 1< ), -O-, -S-, SO or SO 2 , or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, each of which may be substituted by one or more radicals R 2<, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 2<;two radicals R f< can also form a ring system with one another or one radical R f< with one radical R 1< or with another group; s is 0, 1, 2, 3, 4, 5 or 6, preferably 0, 1, 2, 3, or 4, particularly preferably 0, 1 or 2; t is 0, 1, 2, 3, 4, 5, 6, 7 or 8, preferably 0, 1, 2, 3, or 4, particularly preferably 0, 1 or 2; v is 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9, preferably 0, 1, 2, 3, or 4, particularly preferably 0, 1 or 2.

[0034] In a preferred embodiment of the invention, the at least two radicals R, R a< , R b< , R c< , R d< , R e< form a condensed ring with the further groups to which the two radicals R, R a< , R b< , R c< , R d< , R e< are bonded, wherein the two radicals R, R a< , R b< , R c< , R d< , R e< preferably form at least one of the structures of the formulas (RA-1a) to (RA-4f) where the dashed bonds represent the attachment points via which the two radicals R, R a< , R b< , R c< , R d< , R e< bond, the index m is 0, 1, 2, 3 or 4, preferably 0, 1 or 2 and the symbols R 1< , R 2< , R f< and the indices s and t have the meaning set out above, in particular for formula (I) and / or formulas (RA-1) to (RA-12).

[0035] Furthermore, it can be provided that the at least two radicals R, R a< , R b< , R c< , R d< , R e< , which form structures of the formulas (RA-1) to (RA-12) and / or (RA-1a) to (RA-4f) and form a condensed ring, represent radicals R, R a< , R b< , R c< , R d< , R e< from adjacent groups X 1< , X 2< , X 3< , X 4< , X 5< or represent radicals R which are each bonded to adjacent C atoms, these C atoms preferably being connected via a bond.

[0036] In a further preferred embodiment, at least two radicals R, R a< , R b< , R c< , R d< , R e< form a condensed ring with the further groups to which the two radicals R, R a< , R b< , R c< , R d< , R e< are bonded, wherein the two radicals R, R a< , R b< , R c< , R d< , R e< form structures of the formula (RB), where R 1< has the meaning given 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< bond, the index m is 0, 1, 2, 3 or 4, preferably 0, 1 or 2, and Y 3< 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).

[0037] It can be provided that the at least two radicals R, R a< , R b< , R c< , R d< , R e< , form the structures of the formula (RB) and form a condensed ring, represent radicals R, R a< , R b< , R c< , R d< , R e< from adjacent groups X 1< , X 2< , X 3< , X 4< , X 5< or represent radicals R which are each bonded to adjacent C atoms, these C atoms preferably being connected to one another via a bond.

[0038] Particularly preferably, the compounds comprise at least one structure of the formulas (V-1) to (V-36), particularly preferably the compounds are selected from compounds of the formulas (V-1) to (V-36), wherein the compounds have at least one condensed ring, where the symbols Z 1< , Y, V, R a< , R b< , R c< and R d< have the meanings given above, in particular for formula (I), the symbols Z 2< , R e< and Y 1< have the meanings given above, in particular for formula (III-1) to (III-56), the symbol o stands for the attachment points of the condensed ring and the other symbols have the following meaning: l is 0, 1, 2, 3, 4 or 5, preferably 0, 1 or 2; m is 0, 1, 2, 3 or 4, preferably 0, 1 or 2; n is 0, 1, 2 or 3, preferably 0, 1 or 2; j is 0, 1 or 2, preferably 0 or 1; k is 0 or 1.

[0039] Structures / compounds of the formulas (V-12) to (V-36) are preferred and structures / compounds of the formulas (V-12) to (V-24) are particularly preferred.

[0040] Particularly preferably, the compounds comprise at least one structure of the formulas (VI-1) to (VI-20), particularly preferably the compounds are selected from compounds of the formulas (VI-1) to (VI-20), wherein the compounds have at least one condensed ring, where symbols Z 1< , Y, V, R a< , R b< , R c< and R d< have the meanings given above, in particular for formula (I), the symbols Z 2< , R e< and Y 1< have the meanings given above, in particular for formula (III-1) to (III-56), the symbol o stands for the attachment points of the condensed ring and the other symbols have the following meaning: l is 0, 1, 2, 3, 4 or 5, preferably 0, 1 or 2; m is 0, 1, 2, 3 or 4, preferably 0, 1 or 2; n is 0, 1, 2 or 3, preferably 0, 1 or 2; j is 0, 1 or 2, preferably 0 or 1; k is 0 or 1.

[0041] In formulas (VI-1) to (VI-20), V preferably represents a bond or O, particularly preferably O.

[0042] Structures / compounds of the formulas (VI-11) to (VI-20) are preferred.

[0043] The condensed ring, in particular in formulas (V-1) to (V-36) and / or (VI-1) to (VI-20), is preferably formed by at least two radicals R, R a< , R b< , R c< , R d< , R e< and the further groups to which the two radicals R, R a< , R b< , R c< , R d< , R e< bond, where the at least two radicals R, R a< , R b< , R c< , R d< , R e< form structures of the formulas (RA-1) to (RA-12), (RA-1a) to (RA-4f) and / or of the formula (RB), preferably structures of the formulas (RA-1) to (RA-12) and / or (RA-1a) to (RA-4f).

[0044] In particular in formulas (V-1) to (V-36) and / or (VI-1) to (VI-20), the sum of the indices k, j, l, m and n is preferably 0, 1, 2 or 3, particularly preferably 1 or 2.

[0045] Preferably, the compounds may have at least two condensed rings, wherein at least one condensed ring is formed by structures of the formulas (RA-1) to (RA-12) and / or (RA-1a) to (RA-4f) and a further ring is formed by structures of the formulas (RA-1) to (RA-12), (RA-1a) to (RA-4f) or (RB).

[0046] Furthermore, it can be provided that the substituents R, R a< , R b< , R c< , R d< , R e< , R f< , R 1< and R 2< according to the above formulas do not form a condensed aromatic or heteroaromatic ring system 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 1< and R 2< are bonded. This includes the formation of a condensed aromatic or heteroaromatic ring system with possible substituents R 1< and R 2<, which can be bonded to the radicals R, R a< , R b< , R c< , R d< , R e< , R f< and R 1<.

[0047] If two radicals, which can in particular be selected from R, Ra< , Rb< , Rc< , Rd< , Re< , Rf< , R1< and R2< , form a ring system with one another, this can be mono- or polycyclic, aliphatic, heteroaliphatic, aromatic or heteroaromatic. The radicals which form a ring system with one another can be adjacent, i.e. these radicals are bonded to the same carbon atom or to carbon atoms which are directly bonded to one another, or they can be further apart from one another. Furthermore, the ring systems provided with the substituents R, Ra< , Rb< , Rc< , Rd< , Re< , Rf< , R1< and / or R2< can also be connected to one another via a bond, so that a ring closure can be brought about. In this case, 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 1< and / or R 2<.

[0048] According to a preferred embodiment, a compound according to the invention can be prepared by at least one of the structures according to formula (I), (IIa) to (IId), (III-1) to (III-56), (IV-1) to (IV-56), (V-1) to (V-36) and / or (VI-1) to (VI-20). Compounds according to the invention, preferably comprising structures according to formula (I), (IIa) to (IId), (III-1) to (III-56), (IV-1) to (IV-56), (V-1) to (V-36), preferably have 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.

[0049] Furthermore, preferred compounds according to the invention are characterized by their sublimability. These compounds generally have a molecular weight of less than approximately 1200 g / mol.

[0050] 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< , Ar 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 may be linked via the 1-, 2-, 3- or 4-position, spirobifluorene, which may be linked via the 1-, 2-, 3- or 4-position, naphthalene, in particular 1- or 2-linked naphthalene, indole, benzofuran, benzothiophene, carbazole, which may be linked via the 1-, 2-, 3-, 4- or 9-position, Dibenzofuran, which can be linked via the 1-, 2-, 3- or 4-position, Dibenzothiophene, which can be linked via the 1-, 2-, 3- or 4-position, Indenocarbazole, Indolocarbazole, Pyridine, Pyrimidine, Pyrazine, Pyridazine, Triazine, Quinoline, Isoquinoline, Quinazoline, Quinoxaline,Phenanthrene or triphenylene, each of which may be substituted by one or more radicals R 1< or R.,

[0051] Preferably, it can be provided that at least one substituent R, R a< , R b< , R c< , R d< , R e< is selected, identically or differently on each occurrence, from the group consisting of H, D, a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 C atoms or an aromatic or heteroaromatic ring system selected from the groups of the following formulae Ar-1 to Ar-75, where the substituents R, R a< , R b< , R c< , R d< , R e< preferably either form a ring according to the structures of the formulae (RA-1) to (RA-12), (RA-1a) to (RA-4f) or (RB) or the substituent R, R a< , R b< , R c< , R d< , R e< is selected, identically or differently on each occurrence, from the group consisting of H, D or an aromatic or heteroaromatic ring system selected from the groups of the following formulas Ar-1 to Ar-75,and / or the group Ar' is selected, identically or differently at each occurrence, from the groups of the following formulas Ar-1 to Ar-75, , where R 1< has the meanings given above, the dashed bond represents the attachment point and furthermore: Ar 1< is, on each occurrence, identical or different, a bivalent aromatic or heteroaromatic ring system having 6 to 18 aromatic ring atoms, each of which may be substituted by one or more radicals R 1<; A is, on each occurrence, identical or different, C(R 1< ) 2 , NR 1< , O or S; p is 0 or 1, where p = 0 means that the group Ar 1< is not present and that the corresponding aromatic or heteroaromatic group is directly bonded to the corresponding radical; q is 0 or 1, where q = 0 means that no group A is bonded to this position and radicals R 1< are bonded to the corresponding carbon atoms instead.

[0052] If the above-mentioned groups for Ar have several groups A, then all combinations from the definition of A are possible. Preferred embodiments are then those in which one group A stands for NR 1< and the other group A stands for C(R 1< ) 2 or in which both groups A stand for NR 1< or in which both groups A stand for O.

[0053] When A stands for NR 1<, the substituent R 1< which is bonded to the nitrogen atom preferably stands for an aromatic or heteroaromatic ring system having 5 to 24 aromatic ring atoms, which may also be substituted by one or more radicals R 2<. In a particularly preferred embodiment, this substituent R 1<, identical or different on each occurrence, stands for an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, in particular having 6 to 18 aromatic ring atoms, which does not have any fused aryl groups and which does not have any fused heteroaryl groups in which two or more aromatic or heteroaromatic 6-ring groups are directly fused to one another, and which may in each case also be substituted by one or more radicals R 2<.Preferred are phenyl, biphenyl, terphenyl, and quaterphenyl with linkage patterns as listed above for Ar-1 to Ar-11, where these structures may be substituted by one or more R 2< radicals instead of R 1<, but are preferably unsubstituted. Also preferred are triazine, pyrimidine, and quinazoline, as listed above for Ar-47 to Ar-50, Ar-57, and Ar-58, where these structures may be substituted by one or more R 2< radicals instead of R 1<.

[0054] Preferred substituents R, R a< , R b< , R c< , R d< , R e< and R f< are described below.

[0055] In a preferred embodiment of the invention, R, R a< , R b< , R c< , R d< , R e< are identical or different on each occurrence and are 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 C atoms or a branched or cyclic alkyl group having 3 to 20 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 1<, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, preferably having 5 to 40 aromatic ring atoms, which may in each case be substituted by one or more radicals R 1<.

[0056] In a further preferred embodiment of the invention, substituent R, R a< , R b< , R c< , R d< , R e< is the same or different on each occurrence and is selected from the group consisting of H, D, F, a straight-chain alkyl group having 1 to 20 C atoms or a branched or cyclic alkyl group having 3 to 20 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 1<, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, preferably having 5 to 40 aromatic ring atoms, which may in each case be substituted by one or more radicals R 1<.

[0057] Furthermore, it can be provided that at least one substituent R, R a< , R b< , R c< , R d< , R e< is selected, identically or differently on each occurrence, from the group consisting of H, D, an aromatic or heteroaromatic ring system having 6 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 1<, or a group N(Ar') 2 . In a further preferred embodiment of the invention, the substituents R, R a< , R b< , R c< , R d< , R e< either form a ring according to the structures of the formulas (RA-1) to (RA-12), (RA-1a) to (RA-4f) or (RB) or R, R a< , R b< , R c< , R d< , R e< is the same or different on each occurrence and is selected from the group consisting of H, D, an aromatic or heteroaromatic ring system having 6 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 1<, or a group N(Ar') 2 .Particularly preferably, substituent R, R a< , R b< , R c< , R d< , R e< is the same or different on each occurrence and is 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 in each case be substituted by one or more radicals R 1<.

[0058] In a preferred embodiment of the invention, R f< is the same or different on each occurrence and is selected from the group consisting of a straight-chain alkyl group having 1 to 20 C atoms or a branched or cyclic alkyl group having 3 to 20 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 2<, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, preferably having 5 to 40 aromatic ring atoms, which may in each case be substituted by one or more radicals R 2<.

[0059] In a further preferred embodiment of the invention, R f< is the same or different on each occurrence and is selected from the group consisting of a straight-chain alkyl group having 1 to 10 C atoms or a branched or cyclic alkyl group having 3 to 10 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 2<, an aromatic or heteroaromatic ring system having 6 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 2<.Particularly preferably, R a< is selected, identically or differently on each occurrence, from the group consisting of a straight-chain alkyl group having 1 to 5 C atoms or a branched or cyclic alkyl group having 3 to 5 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 2< 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 in each case be substituted by one or more radicals R 2<.

[0060] In a preferred embodiment of the invention, R f< is selected, identically or differently at each occurrence, from the group consisting of a straight-chain alkyl group having 1 to 6 C atoms or a cyclic alkyl group having 3 to 6 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 2<, or an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, which may in each case be substituted by one or more radicals R 2<; two radicals R f< may also form a ring system with one another.Particularly preferably, R f< is selected, identically or differently at each occurrence, from the group consisting of a straight-chain alkyl group having 1, 2, 3 or 4 C atoms or a branched or cyclic alkyl group having 3 to 6 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 2<, 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 in each case be substituted by one or more, preferably non-aromatic radicals R 2<, but is preferably unsubstituted; two radicals R f< can form a ring system with one another. Very particularly preferably, R f< is selected, identically or differently at each occurrence, from the group consisting of a straight-chain alkyl group having 1, 2, 3 or 4 C atoms, or a branched alkyl group having 3 to 6 C atoms.Most preferably, R f< represents a methyl group or a phenyl group, where two phenyl groups together can form a ring system, with a methyl group being preferred over a phenyl group.

[0061] Preferred aromatic or heteroaromatic ring systems substituent R, R a< , R b< , R c< , R d< , R e< , R f< or Ar a< , Ar b< , Ar c< 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 may be linked via the 1-, 2-, 3- or 4-position, spirobifluorene, which may be linked via the 1-, 2-, 3- or 4-position, naphthalene, in particular 1- or 2-linked naphthalene, indole, benzofuran, benzothiophene, carbazole, which may be linked via the 1-, 2-, 3- or 4-position, dibenzofuran, which can be linked via the 1-, 2-, 3- or 4-position, dibenzothiophene, which can be linked via the 1-, 2-, 3- or 4-position, indenocarbazole, indolocarbazole, pyridine, pyrimidine, pyrazine, pyridazine, triazine, quinoline, isoquinoline, quinazoline,Quinoxaline, phenanthrene or triphenylene, which may each be substituted by one or more radicals R, R 1< or R 2<. 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) being preferred and structures of the formulas (Ar-1), (Ar-2), (Ar-3), (Ar-12), (Ar-13), (Ar-14), (Ar-15), (Ar-16) being particularly preferred. With regard to the structures Ar-1 to Ar-75, it should be noted that these are represented with a substituent R 1<. In the case of the ring systems Ar a< , Ar b< , Ar c< these substituents R 1< are to be replaced by R and in the case of R f< these substituents R 1< are to be replaced by R 2<.

[0062] Further suitable groups R, R a< , R b< , R c< , R d< , R e< are groups of the formula -Ar 4< -N(Ar 2< )(Ar 3< ), where Ar 2< , Ar 3< and Ar 4<, identical or different on each occurrence, represent an aromatic or heteroaromatic ring system having 5 to 24 aromatic ring atoms, each of which may be substituted by one or more radicals R 1<. The total number of aromatic ring atoms of Ar 2< , Ar 3< and Ar 4< is a maximum of 60 and preferably a maximum of 40.

[0063] Ar 4< and Ar 2< can be linked to one another and / or Ar 2< and Ar 3< can also be linked to one another by a group selected from C(R 1< ) 2 , NR 1< , O or S. Preferably, the linkage of Ar 4< and Ar 2< to one another, or of Ar 2< and Ar 3< to one another, is in each case ortho to the position of the linkage to the nitrogen atom. In a further embodiment of the invention, none of the groups Ar 2< , Ar 3< or Ar 4< are linked to one another.

[0064] Preferably, Ar 4< is an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, preferably having 6 to 12 aromatic ring atoms, each of which may be substituted by one or more radicals R 1<. Particularly preferably, Ar 4< is selected from the group consisting of ortho-, meta-, or para-phenylene or ortho-, meta-, or para-biphenyl, each of which may be substituted by one or more radicals R 1<, but is preferably unsubstituted. Most preferably, Ar 4< is an unsubstituted phenylene group.

[0065] Preferably, Ar 2< and Ar 3<, identical or different on each occurrence, are 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 1<. Particularly preferred groups Ar 2< and Ar 3< are, identically or differently on each occurrence, 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-, 3- or 4-pyridine, 2-, 4- or 5-pyrimidine, Pyrazine, pyridazine, triazine, phenanthrene or triphenylene, each of which may be substituted by one or more radicals R 1<.Very particularly preferably, Ar 2< and Ar 3< are selected, identically or differently on each occurrence, from the group consisting of benzene, 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, in particular 1-, 2-, 3- or 4-fluorene, or spirobifluorene, in particular 1-, 2-, 3- or 4-spirobifluorene.

[0066] In a further preferred embodiment of the invention, R 1< is selected, identically or differently on each occurrence, from the group consisting of H, D, F, CN, a straight-chain alkyl group having 1 to 10 C atoms or a branched or cyclic alkyl group having 3 to 10 C atoms, where the alkyl group may in each case be substituted by one or more radicals R 2<, or an aromatic or heteroaromatic ring system having 6 to 24 aromatic ring atoms, which may in each case be substituted by one or more radicals R 2<.In a particularly preferred embodiment of the invention, R 1< is selected, identically or differently on each occurrence, from the group consisting of H, a straight-chain alkyl group having 1 to 6 C atoms, in particular having 1, 2, 3 or 4 C atoms, or a branched or cyclic alkyl group having 3 to 6 C 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 may be substituted by one or more radicals R 5<, but is preferably unsubstituted.

[0067] In a further preferred embodiment of the invention, R 2< is, identically or differently on each occurrence, H, an alkyl group having 1 to 4 C atoms or an aryl group having 6 to 10 C atoms, which may be substituted by an alkyl group having 1 to 4 C atoms, but is preferably unsubstituted.

[0068] In compounds according to the invention that are processed by vacuum evaporation, the alkyl groups preferably have no more than five carbon atoms, more preferably no more than 4 carbon atoms, and most preferably no more than 1 carbon atom. Also suitable for compounds that are processed from solution are compounds that are substituted by alkyl groups, in particular branched alkyl groups, with up to 10 carbon atoms, or that are substituted by oligoarylene groups, for example ortho-, meta-, para-, or branched terphenyl or quaterphenyl groups.

[0069] Furthermore, it can be provided that the compound comprises exactly two or exactly three structures according to formula (I), (IIa) to (IIc), (III-1) to (III-56), (IV-1) to (IV-56), (V-1) to (V-36) and / or (VI-1) to (VI-20), wherein 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.

[0070] In a preferred embodiment, the compounds are selected from compounds according to formula (D-1), (D-2), (D-3) or (D-4), where the group L' represents a linking group, preferably a bond or an aromatic or heteroaromatic ring system having 5 to 40, preferably 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R, X is CR or N, preferably CR, and the further symbols and indices used have the meanings given above, in particular for formula (I) and / or formula (III-1) to (III-56).

[0071] In a further preferred embodiment of the invention, L' represents 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 may be substituted by one or more radicals R 1<, but is preferably unsubstituted, where R 1< may have the meaning given above, in particular for formula (I). L' particularly preferably represents 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< may have the meaning given above, in particular for formula (I).

[0072] Furthermore, the symbol L' shown inter alia in formula (D4) preferably represents, identically or differently on each occurrence, 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.

[0073] Furthermore, it can be provided that the group L 1< shown in formula (D4) comprises an aromatic ring system with at most two fused aromatic and / or heteroaromatic 6-membered rings, preferably no fused aromatic or heteroaromatic ring system. Accordingly, naphthyl structures are preferred over anthracene structures. Furthermore, fluorenyl, spirobifluorenyl, dibenzofuranyl, and / or dibenzothienyl structures are preferred over naphthyl structures.

[0074] Particularly preferred are structures that do not exhibit condensation, such as phenyl, biphenyl, terphenyl and / or quaterphenyl structures.

[0075] Examples of 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, which may each be substituted by one or more radicals R 1<, but are preferably unsubstituted.

[0076] The above-mentioned preferred embodiments can be combined with one another as desired within the limitations defined in claim 1. In a particularly preferred embodiment of the invention, the above-mentioned advantages occur simultaneously.

[0077] Examples of preferred compounds according to the embodiments listed above are the compounds listed in the following table: (* not according to the invention) 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 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99* 100 101 102 103 104 105 106 107 108 109 110 111* 112* 113 114 115 116 117* 118 119 120 121 122 123 124 n = 1,2,3, 4, 5, 6, 7, 8, ... 125 126 n = 1,2,3, 4, 5, 6, 7, 8, ... n = 1,2,3, 4, 5, 6, 7, 8, ... 127 128 129

[0078] Preferred embodiments of compounds according to the invention are explained in more detail in the examples, and these compounds can be used alone or in combination with others for all purposes according to the invention.

[0079] Provided that the conditions stated in claim 1 are met, the above-mentioned preferred embodiments can be combined with one another as desired. In a particularly preferred embodiment of the invention, the above-mentioned preferred embodiments apply simultaneously.

[0080] The compounds of the invention can, in principle, be prepared by various methods. However, the methods described below have proven particularly suitable.

[0081] Therefore, a further subject of the present invention is a process for preparing the compounds according to the invention, in which a basic skeleton with a group Z 1< or a precursor of the group Z 1< is synthesized and at least one of the groups W 1< , W 2< is introduced, preferably by means of a nucleophilic aromatic substitution reaction or a coupling reaction.

[0082] Suitable compounds comprising a basic skeleton with a group Z 1< can often be obtained commercially, the starting compounds presented in the examples being obtainable by known processes, so that reference is made thereto.

[0083] 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.

[0084] Particularly suitable and preferred coupling reactions, all of which lead to CC and / or CN bond formations, are those according to BUCHWALD, SUZUKI, YAMAMOTO, STILLE, HECK, NEGISHI, SONOGASHIRA, and HIYAMA. These reactions are widely known, and the examples provide further guidance to the skilled person.

[0085] The principles of the preparation processes described above are, in principle, known from the literature for similar compounds and can be easily adapted by a person skilled in the art to prepare the compounds of the invention. Further information can be found in the examples.

[0086] By these processes, optionally followed by purification, such as recrystallization or sublimation, the compounds according to the invention can be obtained in high purity, preferably more than 99% (determined by 1< H-NMR and / or HPLC).

[0087] The compounds according to the invention can also be mixed with a polymer. It is also possible to incorporate these compounds covalently into a polymer. This is particularly possible with compounds substituted by reactive leaving groups, such as bromine, iodine, chlorine, boronic acid or boronic acid esters, or by 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. The compounds and polymers according to the invention can be used as crosslinked or uncrosslinked layers.

[0088] The invention therefore further provides oligomers, polymers or dendrimers comprising one or more of the above-listed 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 of the structures of the formula (I) and preferred embodiments of this formula to the polymer, oligomer or dendrimer are present. Depending on the linkage of the structures of the formula (I) and preferred embodiments of this formula or of the compounds, 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 apply to the repeating units of the compounds according to the invention in oligomers, dendrimers and polymers as described above.

[0089] To prepare the oligomers or polymers, the monomers according to the invention are homopolymerized or copolymerized with other monomers. Copolymers are preferred, wherein the units according to formula (I) or the preferred embodiments described above and below are present in amounts of 0.01 to 99.9 mol%, preferably 5 to 90 mol%, particularly preferably 20 to 80 mol%. Suitable and preferred comonomers forming 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. according to 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 may contain further units, for example hole-transport units, in particular those based on triarylamines, and / or electron-transport units.

[0090] Of particular interest are also compounds according to the invention that are characterized by a high glass transition temperature. In this context, particular preference is given to compounds according to the invention comprising structures according to formula (I) or the preferred embodiments described above and below, which have a glass transition temperature of at least 70°C, more preferably of at least 110°C, most preferably of at least 125°C, and especially preferably of at least 150°C, determined according to DIN 51005 (version 2005-08).

[0091] For processing the compounds of the invention from the liquid phase, for example by spin coating or printing processes, formulations of the compounds of the invention are required. These formulations can be, for example, solutions, dispersions, or emulsions. It may be preferred to use mixtures of two or more solvents for this purpose. Suitable and preferred solvents are, for example, toluene, anisole, o-, m- or p-xylene, methyl benzoate, mesitylene, tetralin, veratrole, THF, methyl-THF, THP, chlorobenzene, dioxane, phenoxytoluene, in particular 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, α-terpineol, benzothiazole, butyl benzoate, cumene, cyclohexanol, cyclohexanone, cyclohexylbenzene, Decalin, dodecylbenzene, ethyl benzoate, indane, NMP, p-cymene, phenetol,1,4-Diisopropylbenzene, dibenzyl ether, diethylene glycol butyl methyl ether, triethylene glycol butyl methyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, diethylene glycol monobutyl ether, tripropylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 2-isopropylnaphthalene, pentylbenzene, hexylbenzene, heptylbenzene, octylbenzene, 1,1-bis(3,4-dimethylphenyl)ethane, 2-methylbiphenyl, 3-methylbiphenyl, 1-methylnaphthalene, 1-ethylnaphthalene, ethyl octanoate, diethyl sebacate, octyl octanoate, heptylbenzene, menthyl isovalerate, cyclohexylhexanoate or mixtures of these solvents.

[0092] The present invention therefore further provides a formulation or a composition comprising at least one compound according to the invention and at least one further compound. The further compound can, for example, be a solvent, in particular one of the abovementioned solvents or a mixture of these solvents. If the further compound comprises a solvent, this mixture is referred to herein as a formulation. However, the further compound can also be at least one further organic or inorganic compound which is likewise used in the electronic device, for example an emitter and / or a matrix material, wherein these compounds differ from the compounds according to the invention. Suitable emitters and matrix materials are listed below in connection with the organic electroluminescent device. The further compound can also be polymeric.

[0093] The present invention therefore further provides a composition comprising a compound according to the invention and at least one further organic functional material. Functional materials are generally the organic or inorganic materials introduced between the anode and cathode. The organic functional material is preferably selected from the group consisting of fluorescent emitters, phosphorescent emitters, emitters exhibiting 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.

[0094] The present invention further provides for 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. In this case, compounds according to the invention preferably exhibit fluorescent properties and thus preferably provide fluorescent emitters. Furthermore, compounds according to the invention can be used as host materials, electron transport materials and / or hole transport materials. In particular, compounds according to the invention in which the groups Z 1< , Z 2< stand for N can advantageously be used as hole transport material. Furthermore, compounds according to the invention in which the groups Z 1< , Z 2< stand for B can advantageously be used as electron transport material.Furthermore, compounds according to the invention can be used as materials for the color conversion of light (for example as PCC Pixel Color Converter).

[0095] The present invention further relates to an electronic device comprising at least one compound according to the invention. An electronic device within the meaning of the present invention is a device that contains at least one layer containing at least one organic compound. The component may also contain inorganic materials or layers composed entirely of inorganic materials.

[0096] The electronic device is preferably selected from the group consisting of Particularly preferably, the electronic device is selected from the group consisting of organic electroluminescent devices (OLEDs, sOLEDs, PLEDs, LECs, etc.), preferably organic light-emitting diodes (OLEDs), organic light-emitting diodes based on small molecules (sOLEDs), organic light-emitting diodes based on polymers (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, preferably organic electroluminescent devices (OLEDs, sOLEDs, PLEDs, LECs, etc.), particularly preferably organic light-emitting diodes (OLEDs), organic light-emitting diodes based on small molecules (sOLEDs), organic light-emitting diodes based on polymers (PLEDs), in particular phosphorescent OLEDs.

[0097] The organic electroluminescent device contains a cathode, an anode, and at least one emitting layer. In addition to these layers, it may 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. Interlayers, which, for example, have an exciton-blocking function, may also be inserted between two emitting layers. It should be noted, however, that not all of these layers are necessarily present. The organic electroluminescent device may contain one emitting layer or it may contain multiple emitting layers.If multiple emission layers are present, they preferably have a total of multiple emission maxima between 380 nm and 750 nm, resulting in overall white emission. This means that different emitting compounds that can fluoresce or phosphoresce are used in the emitting layers. Systems with three emitting layers are particularly preferred, with the three layers exhibiting 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.

[0098] The compound according to the invention can be used in different layers, depending on the precise structure. Preferred is an organic electroluminescent device containing a compound according to formula (I) or the preferred embodiments described above in an emitting layer as an emitter, preferably a red, green, or blue emitter.

[0099] When the compound according to the invention is used as an emitter in an emitting layer, a suitable matrix material which is known as such is preferably used.

[0100] A preferred mixture of the compound according to the invention and a matrix material contains between 99 and 1 vol.%, preferably between 98 and 10 vol.%, particularly preferably between 97 and 60 vol.%, in particular between 95 and 80 vol.% of matrix material, based on the total mixture of emitter and matrix material. Accordingly, the mixture contains between 1 and 99 vol.%, preferably between 2 and 90 vol.%, particularly preferably between 3 and 40 vol.%, in particular between 5 and 20 vol.% of the emitter, based on the total mixture of emitter and matrix material.

[0101] 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. according to WO 2004 / 013080, WO 2004 / 093207, WO 2006 / 005627 or WO 2010 / 006680, triarylamines, carbazole derivatives, e.g. CBP (N,N-biscarbazolylbiphenyl) or those in WO 2005 / 039246, US 2005 / 0069729, JP 2004 / 288381, EP 1205527, WO 2008 / 086851 or WO 2013 / 041176, 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, 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, e.g. B. according to WO 2007 / 137725, silanes, e.g. B. according to WO 2005 / 111172, azaboroles or boronate esters, e.g. B. according to WO 2006 / 117052, triazine derivatives, e.g.according to WO 2007 / 063754, WO 2008 / 056746, WO 2010 / 015306, WO 2011 / 057706, WO 2011 / 060859 or WO 2011 / 060877, zinc complexes, e.g. according to EP 652273 or WO 2009 / 062578, diazasilole or tetraazasilole derivatives, e.g. according to WO 2010 / 054729, diazaphosphole derivatives, e.g. according to WO 2010 / 054730, bridged carbazole derivatives, e.g. B. according to WO 2011 / 042107, WO 2011 / 060867, WO 2011 / 088877 and WO 2012 / 143080, triphenylene derivatives, e.g. according to WO 2012 / 048781, dibenzofuran derivatives, e.g. according to WO 2015 / 169412, WO 2016 / 015810, WO 2016 / 023608, WO 2017 / 148564 or WO 2017 / 148565 or biscarbazoles, e.g. according to JP 3139321 B2.

[0102] Furthermore, a compound that does not participate, or does not participate to a significant extent, in charge transport can be used as a co-host, as described, for example, in WO 2010 / 108579. Particularly suitable co-matrix materials in combination with the compound according to the invention are compounds that have a large band gap and do not themselves participate, or at least do not participate 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 WO 2010 / 006680.

[0103] In a preferred embodiment, a compound according to the invention used as an emitter is preferably used in combination with one or more phosphorescent materials (triplet emitters) and / or a compound that represents a TADF (thermally activated delayed fluorescence) host material. This preferably forms a hyperfluorescence and / or hyperphosphorescence system.

[0104] WO 2015 / 091716 A1 and WO 2016 / 193243 A1 disclose OLEDs that 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). In this context, the phosphorescent compound therefore behaves like a host material. As those skilled in the art know, host materials have higher singlet and triplet energies than the emitters, so that the energy of the host material is transferred to the emitter as optimally as possible. The systems disclosed in the prior art exhibit precisely such an energy relationship.

[0105] For the purposes of this invention, phosphorescence refers to luminescence from an excited state with higher spin multiplicity, i.e., a spin state > 1, in particular from an excited triplet state. For the purposes of this application, all luminescent complexes with transition metals or lanthanides, in particular all iridium, platinum, and copper complexes, are to be considered phosphorescent compounds.

[0106] Particularly suitable phosphorescent compounds (= triplet emitters) are compounds that emit light upon suitable excitation, preferably in the visible range, and 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, in particular a metal with this atomic number. Compounds containing copper, molybdenum, tungsten, rhenium, ruthenium, osmium, rhodium, iridium, palladium, platinum, silver, gold, or europium are preferably used as phosphorescent emitters, in particular compounds containing iridium or platinum.

[0107] 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 2011 / 032626, WO 2011 / 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 / 117718, WO 2016 / 015815, WO 2016 / 124304, WO 2017 / 032439, WO 2018 / 011186, WO 2018 / 001990, WO 2018 / 019687, WO 2018 / 019688, WO 2018 / 041769, WO 2018 / 054798, WO 2018 / 069196, WO 2018 / 069197, WO 2018 / 069273, WO 2018 / 178001, WO 2018 / 177981, WO 2019 / 020538, WO 2019 / 115423, WO 2019 / 158453 and WO 2019 / 179909.In general, all phosphorescent complexes as used according to the prior art for phosphorescent electroluminescent devices and as known to the person skilled in the art in the field of organic electroluminescence are suitable, and the person skilled in the art can use further phosphorescent complexes without inventive step.

[0108] A compound according to the invention can preferably be used in combination with a TADF host material and / or a TADF emitter, as previously explained.

[0109] The process known as thermally activated delayed fluorescence (TADF) is described, for example, by BH Uoyama et al., Nature 2012, Vol. 492, 234. To enable this process, a comparatively small singlet-triplet separation ΔE(S 1 - T 1 ) of, for example, less than about 2000 cm -1 is required in the emitter. To open the inherently spin-forbidden transition T 1 → S 1 , another compound can be provided in the matrix next to the emitter. This compound exhibits strong spin-orbit coupling, enabling inter-system crossing through the spatial proximity and the resulting interaction between the molecules. Alternatively, the spin-orbit coupling can be generated via a metal atom contained in the emitter.

[0110] In a further embodiment of the invention, the organic electroluminescent device according to the invention does not contain a separate hole injection layer and / or hole transport layer and / or hole blocking layer and / or electron transport layer, i.e. 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. Furthermore, it is possible to use a metal complex that is the same as or similar to the metal complex in the emitting layer as a hole transport or hole injection material directly adjacent to the emitting layer, as described, for example, in WO 2009 / 030981.

[0111] Furthermore, an organic electroluminescent device is preferred, comprising a compound according to formula (I) or the preferred embodiments outlined above in a hole-conducting layer as hole-conducting material. Particular preference is given here to compounds in which the groups Z 1< N and the group Y stands for N(Ar b< ), N(R), P(Ar b< ), P(R), CR 2 , SiR 2 , O, S or Se. Furthermore, compounds in which at least one, preferably two, of the groups Z 1< , Z 2< N is / are.

[0112] Furthermore, an organic electroluminescent device is preferred which comprises a compound according to formula (I) or the preferred embodiments described above in an electron-conducting layer as electron-transport material. Particular preference is given here to compounds in which the groups Z 1< B and the group Y stands for B(Ar b< ), B(R), P(=O)Ar b< , P(=O)R, Al(Ar b< ), Al(R), Ga(Ar b< ), Ga(R), C=O, S=O or SO 2. Furthermore, particular preference is given here to compounds in which at least one, preferably two, of the groups Z 1< , Z 2< is / are B.

[0113] In the further layers of the organic electroluminescent device according to the invention, all materials commonly used in the prior art can be used. Therefore, the skilled person can, without inventive step, use all materials known for organic electroluminescent devices in combination with the compounds according to formula (I) according to the invention or the preferred embodiments described above.

[0114] Also preferred is an organic electroluminescent device 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.

[0115] 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 patterned.

[0116] 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, offset printing, LITI (Light Induced Thermal Imaging, thermal transfer printing), inkjet printing, or nozzle printing. Soluble compounds are required for this, which are obtained, for example, by suitable substitution.

[0117] Formulations for applying a compound according to formula (I) or the preferred embodiments thereof set out above are novel. A further subject of the present invention is therefore a formulation comprising at least one solvent and a compound according to formula (I) or the preferred embodiments thereof set out above.

[0118] Furthermore, hybrid processes are possible, in which, for example, one or more layers are applied from solution and one or more further layers are vapor-deposited.

[0119] These processes are generally known to the person skilled in the art and can be applied by him without inventive step to organic electroluminescent devices containing the compounds according to the invention.

[0120] The compounds of the invention and the organic electroluminescent devices of the invention are distinguished from the prior art, in particular by an improved lifetime. The other electronic properties of the electroluminescent devices, such as efficiency or operating voltage, remain at least as good. In a further variant, the compounds of the invention and the organic electroluminescent devices of the invention are distinguished from the prior art, in particular by an improved efficiency and / or operating voltage and a longer lifetime.

[0121] The electronic devices according to the invention, in particular organic electroluminescent devices, are characterized by one or more of the following surprising advantages over the prior art: 1. Electronic devices, in particular organic electroluminescent devices containing compounds according to formula (I) or the preferred embodiments described above and below as emitters, have very narrow emission bands with low FWHM values ( F ull W idth H alf Maximum) and lead to particularly color-pure emission, recognizable by the small CIE y values. What is particularly surprising here is that both blue emitters with low FWHM values and emitters with low FWHM values that emit in the green, yellow or red region of the color spectrum are provided. 2. Electronic devices, in particular organic electroluminescent devices comprising 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 lifetime. In this case, these compounds bring about, in particular, low roll-off, ie a small drop in the power efficiency of the device at high luminance levels. 3. Electronic devices, in particular organic electroluminescent devices comprising compounds of the formula (I) orthe preferred embodiments described above and below as emitters, as hole conductor material and / or as electron transport material have excellent efficiency. In this case, compounds according to the invention of the formula (I) or the preferred embodiments described above and below result in a low operating voltage when used in electronic devices. 4. The compounds according to the invention of the formula (I) or the preferred embodiments described above and below show very high stability and lifetime. 5. Using compounds according to formula (I) or the preferred embodiments described above and below, the formation of optical loss channels can be avoided in electronic devices, in particular organic electroluminescent devices. As a result, these devices are characterized by high PL and thus high EL efficiency of emitters orexcellent energy transfer from the matrices to dopants. 6. Compounds according to formula (I) or the preferred embodiments described above and below exhibit excellent glass film formation. 7. Compounds according to formula (I) or the preferred embodiments described above and below form very good films from solutions and exhibit excellent solubility.

[0122] These advantages mentioned above are not accompanied by an excessive deterioration of the other electronic properties.

[0123] The teaching of technical action disclosed by the present invention can be abstracted and combined with other examples.

[0124] The invention is further illustrated by the following examples, without intending to limit it. From the descriptions, those skilled in the art can practice the invention within the entire disclosed scope and, without inventive step, prepare further compounds according to the invention and use them in electronic devices or apply the method according to the invention. Examples:

[0125] Unless otherwise stated, the following syntheses were carried out under a protective gas atmosphere in dried solvents. The metal complexes were also handled in the absence of light or under yellow light. The solvents and reagents can be obtained from Sigma-ALDRICH or ABCR, for example. The respective information in square brackets or the numbers given for individual compounds refer to the CAS numbers of the known compounds. For compounds that can exhibit multiple enantiomeric, diastereomeric, or tautomeric forms, one form is shown as a representative example. Synthesis of synthons S: Example S1:

[0126]

[0127] Procedure analogous to Chung-Chieh Lee et al., Synthesis 2008, 9, 1359.

[0128] Complete procedure, including workup, under protective gas. A mixture of 34.0 g (120 mmol) of 1-bromo-2-iodobenzene [583-55-1], 17.1 g (100 mmol) of 2,3-dihydronaphth[1,8-de]-1,3-oxazine [210229-54-2], 20.7 g (150 mmol) of potassium carbonate, 1.9 g (10 mmol) of copper iodide [7681-65-4], 2.9 g (20 mmol) of 1R,2R-N,N-dimethyl-1,2-cyclohexanediamine [67579-81-8], 50 g of glass beads, and 200 ml of o-xylene was stirred at 130 °C for 24 h. After cooling, the reaction mixture is treated with 500 ml of ethyl acetate and 500 ml of water. The organic phase is separated, washed once with 500 ml of water and twice with 300 ml of saturated sodium chloride solution, and dried over magnesium sulfate. The mixture is filtered through a bed of silica gel pre-slurried with ethyl acetate, the filtrate is concentrated to dryness, the residue is boiled with 300 ml of ethanol, the solid is filtered off, and the solid is washed twice with 50 ml of ethanol, dried in vacuo, and recrystallized from acetonitrile / DCM (dichloromethane). Yield: 20.7 g (64 mmol) 64%; Purity: approx. 95% n.1< H-NMR.

[0129] The following connections can be represented analogously: e.g. reactants product yield S2 45990-12-3 41 % S3 45990-12-3 56 % 96843-22-0 S4 900806-53-3 58% S5 1846603-15-3 50 % S6 676267-05-3 63 % S7 90948-03-1 67 % S8 93188-73-9 65 % S9 916747-51-8 60 % S10 1541101-10-3 57 % S11 184885-74-3 59 % S12 1776056-64-4 49 % S13 1801624-64-5 54 % S14 1801624-66-7 61 % S15 52776-05-3 60 % S16 103698-58-4 55 % S17 192865-46-6 50 % S18 1548470-73-0 48 % S19 2226847-79-4 44 % S20 1548471-03-9 46 % S21 140898-76-6 43 % S22 2086712-49-2 63 % S23 2222443-14-1 61 % S24 2222442-94-4 68 % S25 1549979-42-1 56 % S26 2173184-34-2 59 % S27 1549979-37-4 55% S28 2186703-50-2 41 % S29 1031849-88-3 23 % S30 14627-44-2 27 % S31 1046768-16-9 49 % Example dopant D1:

[0130] Steps 1 to 3 of the following sequence are carried out as a three-step one-pot reaction. The workup in step 3 is carried out under protective gas. Step 1: Lithiation of S1

[0131] Intermediate, not isolated

[0132] In a baked, argon-inertized four-necked flask equipped with a magnetic stirrer, dropping funnel, water separator, reflux condenser and argon blanket, 16.1 g (50 mmol) of S1 in 1700 ml tert -butylbenzene. The reaction mixture is cooled to -40 °C and then added dropwise over 30 min with 110.5 ml (210 mmol) tert -Butyllithium, 1.9 M in n -pentane. Stir for a further 30 minutes at -40 °C, allow to warm to room temperature, then heat to 70 °C and distill the n -Pentane over the water separator for about 1 hour. Step 2: Transmetalation and cyclization

[0133]

[0134] The reaction mixture is cooled back to -40 °C. 10.4 ml (110 mmol) of boron tribromide are added dropwise over a period of approximately 10 min. After the addition, the reaction mixture is stirred at RT for 1 h. The reaction mixture is then cooled to 0 °C and added dropwise over a period of approximately 30 min with 19.2 ml (110 mmol) of di ISO -propylethylamine. The reaction mixture is then stirred at 160 °C for 16 h. After cooling, the di- ISO propylethylammonium hydrobromide through a reverse frit and the filtrate is cooled to -78 °C. Step 3: Arylation

[0135]

[0136] In a second baked, argon-inertized Schlenk flask equipped with a magnetic stirrer bar, 27.8 g (150 mmol) of 2-bromo-1,3-dimethylbenzene [576-22-7] in 1000 ml of diethyl ether are placed and cooled to -78 °C. 60.0 ml (150 mmol) of n -Butyllithium, 2.5 M in n-hexane and then stirred for 30 min. The reaction mixture is allowed to warm to RT, stirred for 1 h, and the solvent is completely removed under vacuum. The lithium organyl compound is suspended in 300 ml of toluene and transferred to the cryogenic reaction mixture from step 2. Stirred for 1 h, and the reaction mixture is allowed to warm to RT overnight. 15 ml of acetone is carefully added to the reaction mixture and the mixture is concentrated to dryness. The oily residue is absorbed with DCM onto ISOLUTE® and filtered hot through a bed of silica gel using a pentane-DCM mixture (10:1). The filtrate is concentrated to dryness. The residue is flash chromatographed twice, silica gel, n -Heptane / ethyl acetate, automatic column torrent from A. Semrau. Step 4: Oxidation to D1

[0137]

[0138] Procedure analogous to R. Doringer et al., Monatshefte für Chemie, 2006, 137, 185. The product from step 3 is dissolved in 150 ml of chlorobenzene, mixed with 20 g of activated molecular sieve 3 A, and stirred in air at 60 °C under exclusion of light until complete oxidation (approx. 5 h). The molecular sieve is filtered off, washed with a little chlorobenzene, and evaporated to dryness in vacuo. The residue is flash chromatographed twice, chromatographed on silica gel, n -Heptane / ethyl acetate, Torrent column analyzer from A. Semrau. Further purification is carried out by repeated hot extraction crystallization with DCM / acetonitrile and subsequent fractional sublimation or annealing under high vacuum. Yield: 7.4 g (20 mmol) 40%; Purity: approximately 99.9% by 1< H-NMR.

[0139] The following compounds can be prepared analogously: (* not according to the invention): e.g. reactant Products yield D2 3972-65-4 28 % D3 126866-29-3 30 % D4 576-83-0 27 % D5 10368-73-7 23 % D6 90-11-9 25 % D7 7412-67-1 Use in step 3 as ethereal standard solution 17 % D8 23674-20-6 21 % D9 576-83-0 28 % D10 576-83-0 30 % D11 10368-73-7 29 % D12 22385-77-9 22 % D13 576-83-0 27 % D14 57190-17-7 26 % D15 10368-73-7 27 % D16 10368-73-7 20 % D17 576-83-0 13 % D18 576-83-0 21 % D19 50548-45-3 20 % D20 146070-73-7 13 % D21 942615-32-9 21% D22 576-83-0 23 % D23 64248-56-2 15 % D24 1562418-80-7 18 % D25 2052-07-5 17 % D26 1801624-97-4 22 % D27 758673-19-5 26 % D28 3972-65-4 18 % D29 576-83-0 10 % D30 576-83-0 19 % D31 576-83-0 Only step 1 to 1 12 % D100 * Steps 1, 2 & 4 26 % 75-44-5 1 M in Toluol D200 * Steps 1, 2 & 4 Racemat 15 % 824-72-6 D300 * Steps 1, 2 & 4 11 % 10545-99-0 D400 * Steps 1, 2 & 4 10 % 7791-25-5 D500 * H500 Steps 1, 2 & 4 17 % 103-33-3 D600 * Steps 1, 2 & 4 16 % 18395-90-9 D601 * Steps 1, 2 & 4 21 % 80-10-4 Example dopant D6PA and D6PB* :

[0140]

[0141] Preparation from D6 by flash vacuum pyrolysis, carrier gas argon, vacuum approx. 1333 Pa (10 -2 < torr), pyrolysis zone temperature 550 °C, contact 5% PdO on alumina. Chromatographic separation, DCM / n-heptane, silica gel. Yields: D6PA 14%; D6PB 17%. Manufacturing of OLED components 1) Vacuum-processed components:

[0142] The production of OLEDs according to the invention and OLEDs according to the prior art is carried out according to a general process according to WO 2004 / 058911, which is adapted to the conditions described here (layer thickness variation, materials used).

[0143] The following examples present the results of various OLEDs. Cleaned glass plates (cleaned in a Miele laboratory dishwasher using Merck Extran cleaner) coated with 50 nm thick structured ITO (indium tin oxide) are pretreated with UV ozone for 25 minutes (UV ozone generator PR-100, UVP) and, within 30 minutes, coated with 20 nm PEDOT:PSS (poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate), purchased as CLEVIOS™< P VP Al 4083 from Heraeus Precious Metals GmbH, Germany, spin-coated from aqueous solution) for improved processing. These coated glass plates are then baked at 180°C for 10 minutes. These coated glass plates form the substrates onto which the OLEDs are applied.

[0144] The OLEDs basically have the following layer structure: Substrate / Hole injection layer 1 (HIL1) consisting of HTM1 doped with 5% NDP-9 (commercially available from Novaled), 20 nm / Hole transport layer 1 (HTL1) made of: 150 nm HTM1 for blue OLEDs; 50 nm or 50 nm H500 in example D-D6PA for green & yellow OLEDs; 110 nm for red OLEDs / Hole transport layer 2 (HTL2) made of: 10 nm for blue OLEDs; 20 nm for green & yellow OLEDs; 10 nm 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. The cathode is formed by a 100 nm thick aluminum layer.

[0145] First, vacuum-processed OLEDs are described. For this, all materials are thermally vapor-deposited in a vacuum chamber. The emission layer always consists of at least one matrix material (host material) and an emitting dopant (emitter), which is mixed with the matrix material(s) by co-evaporation in a specific volume fraction. A specification such as SMB1:D1 (95%:5%) means that the material SEB1 is present in the layer in a volume fraction of 95% and D1 in a volume fraction of 5%. Analogously, the electron-transport layer can also consist of a mixture of two materials. The exact structure of the OLEDs can be found in Table 1. The materials used to manufacture the OLEDs are shown in Table 5.

[0146] OLEDs are characterized as standard. For this purpose, the electroluminescence spectra, current efficiency (measured in cd / A), power efficiency (measured in λm / W), and external quantum efficiency (EQE, measured in percent) are determined as a function of luminance, calculated from current-voltage-luminance (IUL) curves assuming a Lambertian emission pattern. The electroluminescence spectra are determined at a luminance of <1000 cd / m², and the emission color is derived from them.

[0147] Use of compounds according to the invention as materials in OLEDs: The compounds according to the invention can be used, among other things, as dopant in the emission layer and as transport materials in OLEDs. Table 1: Structure of the OLEDs * not according to the invention) e.g. EML HBL ETL Blue OLEDs (400 - 499 nm) D-D1 SMB1:D1 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D2 SMB4:D2 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D3 SMB1:D3 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D4 SMB1:D4 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D6 SMB1:D6 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D7 SMB1:D7 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D9 SMB1:D9 (92%:8%) ETM1 ETM1:ETM2 (50%:50%) D-D10 SMB1:D10 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D11 SMB1:D11 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D12 SMB1:D12 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D13 SMB1:D13 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D14 SMB1:D14 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D17 SMB1:D17 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D18 SMB1:D18 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D19 SMB1:D19 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D22 SMB1:D22 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D23 SMB1:D23 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D24 SMB1:D24 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D25 SMB3:D25 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D26 SMB2:D26 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D27 SMB2:D27 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D28 SMB2:D28 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D31 SMB2:D31 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) D-D300* SMB4:D300 (95%:5%) ETM1 ETM1:ETM2 (50%:50%) Green OLEDs (500 - 540 nm) D-D6PA SMB2:D6PA (97%:3%) ETM1 ETM1:ETM2 (50%:50%) D-D6PB* SMB1:D6PB (97%:3%) ETM1 ETM1:ETM2 (50%:50%) Results of the vacuum-processed OLEDs:

[0148] The blue OLED devices exhibit emission maxima in the range of 400–499 nm, while the green OLED devices exhibit emission maxima in the range of 500–540 nm. Both exhibit narrow emission spectra with a full width half maximum (FWHM) in the range of approximately 25–40 nm. The external quantum efficiency (EQE) is typically 5.5–7.0%, with operating voltages typically ranging from 4.0–4.2 V for green and 4.5–4.7 V for blue OLED devices. The device lifetimes are sufficient for building commercial products.

[0149] Table 2 summarizes measurement data. Table 2: Results of vacuum-processed OLEDs e.g. EQE (%) 1000 cd / m 2 Voltage (V) 1000 cd / m 2< Color D-D22 5.6 4.6 Blue D-D28 6.4 4.5 Blue D-D6PA 7.0 4.0 Green 2) Solution-processed components:

[0150] The production of solution-based OLEDs is generally described in the literature, e.g., in WO 2004 / 037887 and WO 2010 / 097155. In the following examples, both production methods (gas-phase deposition and solution processing) were combined, so that the entire layer up to and including the emission layer was processed from solution, and the subsequent layers (hole-blocking layer / electron-transport layer) were vacuum-deposited. The general processes described above are adapted and combined to the conditions described here (layer thickness variation, materials) as follows.

[0151] The structure used is as follows: Substrate, ITO (50 nm), PEDOT (20 nm), hole transport layer (HIL2) (20 nm), emission layer (95 wt% host H1, 5 wt% dopant) (60 nm), electron transport layer (ETM1 50% + ETM2 50%) (20 nm), cathode (Al).

[0152] Glass flakes coated with structured ITO (indium tin oxide) with a thickness of 50 nm are used as the substrate. For easier processing, these are coated with the buffer (PEDOT) Clevios P VP Al 4083 (Heraeus Clevios GmbH, Leverkusen) - PEDOT is written above. The layer is spin-coated in air from water. The layer is then baked for 10 minutes at 180°C. The hole-transport layer and the emission layer are applied to the coated glass flakes. The hole-transport layer is the polymer with the structure shown in Table 5, which was synthesized according to WO2010 / 097155. The polymer is dissolved in toluene, so that the solution typically has a solids content of approx. 5 g / l if, as here, the layer thickness of 20 nm typical for a device is to be achieved by spin coating. The layers are spun on in an inert gas atmosphere, in this case argon, and baked for 60 minutes at 180°C.

[0153] The emission layer always consists of at least one matrix material H (host material) and one emitting dopant (dopant, emitter). H1 (95 wt%) is used as the matrix material (see Table 5), and the compounds shown in Table 2 are used as the dopant D (5 wt%). The mixture for the emission layer is dissolved in toluene or chlorobenzene. The typical solids content of such solutions is approximately 18 g / l if, as here, the layer thickness of 60 nm typical for a device is to be achieved by spin coating. The layers are spun on in an inert gas atmosphere, in this case argon, and baked for 10 minutes at 130° to 150°C.

[0154] The materials for the electron-transport layer and the cathode are thermally vapor-deposited in a vacuum chamber. For example, the electron-transport layer can consist of more than one material, which are mixed together in a specific volume fraction by co-evaporation. A specification such as ETM1:ETM2 (50%:50%) means that, as in this case, the materials ETM1 and ETM2 each make up 50% of the layer. The cathode is formed by a 100 nm thick aluminum layer. The materials used in this case are shown in Table 5. Table 3: Structure of the OLEDs e.g. Endowed Blue OLEDs (430 - 499 nm) Sol.-D5 D5 Sol.-D15 D15 Sol.-D16 D16 Sol.-D20 D20 Results of the solution-processed OLEDs:

[0155] The blue OLED devices exhibit emission maxima in the range of 430–499 nm and have narrow emission spectra with a full width half maximum (FWHM) in the range of approximately 25–45 nm. The external quantum efficiency (EQE) is typically 4.5–5.5%, with operating voltages typically ranging from 4.3–4.5 V for green and 4.5–4.9 V for blue OLED devices. The device lifetimes are sufficient for the construction of commercial products.

[0156] Table 4 summarizes measurement data. Table 4: Results of the solution-processed OLEDs e.g. EQE (%) 1000 cd / m 2 Voltage (V) 1000 cd / m 2< Color Sol.-D15 5.0 4.5 Blue Sol.-D20 4.8 4.7 Blue Table 5: Structural formulas of the materials used [136463-07-5] [1450933-44-4] [1087346-88-0] [667940-34-3] [1627916-48-6] [1818872-85-3] [342638-54-4] [1233200-52-6] [25387-93-3] HIL2

Claims

1. Compound comprising at least one structure of the formula (IIa): where the symbols and indices used are as follows: Z1 is the same or different at each instance and is N; W1, W2 are the same or different at each instance and are X4 or the two W1, W2 radicals together form an Ara group, where the Ara group formed by the two W1, W2 radicals is joined in ortho position to the further Y, Z1 radicals; Y is the same or different at each instance and is B(Arb) or B(R); V is the same or different at each instance and is a single bond, C(R)2, O or S; Ara is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted by one or more R radicals; the Ara group here may form a ring system with Y, U or a further group; Arb is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted by one or more R radicals; the Arb group here may form a ring system with W1, X2 or a further group; X1 is the same or different at each instance and is N or CRa, with the proviso that not more than two of the X1, X2, X3 groups in one cycle are N; X2 is the same or different at each instance and is N or CRb, with the proviso that not more than two of the X1, X2, X3 groups in one cycle are N; X3 is the same or different at each instance and is N or CRc, with the proviso that not more than two of the X1, X2, X3 groups in one cycle are N; X4 is the same or different at each instance and is N or CRd, with the proviso that not more than two of the X4 groups in one cycle are N; R, Ra, Rb, Rc, Rd is the same or different at each instance and is H, D, OH, F, Cl, Br, I, CN, NO2, N(Ar')2, N(R1)2, C(=O)N(Ar')2, C(=O)N(R1)2, C(Ar')3, C(R1)3, Si(Ar')3, Si(R1)3, B(Ar')2, B(R1)2, C(=O)Ar', C(=O)R1, P(=O)(Ar')2, P(=O)(R1)2, P(Ar')2, P(R1)2, S(=O)Ar', S(=O)R1, S(=O)2Ar', S(=O)2R1, OSO2Ar', OSO2R1, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or an alkenyl or alkynyl group having 2 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 carbon atoms, where the alkyl, alkoxy, thioalkoxy, alkenyl or alkynyl group may in each case be substituted by one or more R1 radicals, where one or more nonadjacent CH2 groups may be replaced by R1C=CR1, C≡C, Si(R1)2, C=O, C=S, C=Se, C=NR1, -C(=O)O-, -C(=O)NR1-, NR1, P(=O)(R1), -O-, -S-, SO or SO2, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted in each case by one or more R1 radicals, or an aryloxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R1 radicals; at the same time, two R, Ra, Rb, Rc, Rd radicals may also form a ring system together or with a further group; Ar' is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted by one or more R1 radicals; at the same time, it is possible for two Ar' radicals bonded to the same carbon atom, silicon atom, nitrogen atom, phosphorus atom or boron atom also to be joined together via a bridge by a single bond or a bridge selected from B(R1), C(R1)2, Si(R1)2, C=O, C=NR1, C=C(R1)2, O, S, S=O, SO2, N(R1), P(R1) and P(=O)R1; R1 is the same or different at each instance and is H, D, F, Cl, Br, I, CN, NO2, N(Ar")2, N(R2)2, C(=O)Ar", C(=O)R2, P(=O)(Ar")2, P(Ar'')2, B(Ar")2, B(R2)2, C(Ar'')3, C(R2)3, Si(Ar'')3, Si(R2)3, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 carbon atoms or an alkenyl group having 2 to 40 carbon atoms, each of which may be substituted by one or more R2 radicals, where one or more nonadjacent CH2 groups may be replaced by -R2C=CR2-, -C≡C-, Si(R2)2, C=O, C=S, C=Se, C=NR2, -C(=O)O-, -C(=O)NR2-, NR2, P(=O)(R2), -O-, -S-, SO or SO2 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms, each of which may be substituted by one or more R2 radicals, or an aryloxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R2 radicals, or an aralkyl or heteroaralkyl group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R2 radicals, or a combination of these systems; at the same time, two or more R1 radicals together may form a ring system; at the same time, one or more R1 radicals may form a ring system with a further part of the compound; Ar'' is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 30 aromatic ring atoms and may be substituted by one or more R2 radicals; at the same time, it is possible for two Ar'' radicals bonded to the same carbon atom, silicon atom, nitrogen atom, phosphorus atom or boron atom also to be joined together via a bridge by a single bond or a bridge selected from B(R2), C(R2)2, Si(R2)2, C=O, C=NR2, C=C(R2)2, O, S, S=O, SO2, N(R2), P(R2) and P(=O)R2; R2 is the same or different at each instance and is selected from the group consisting of H, D, F, CN, an aliphatic hydrocarbyl radical having 1 to 20 carbon atoms or an aromatic or heteroaromatic ring system which has 5 to 30 aromatic ring atoms and in which one or more hydrogen atoms may be replaced by D, F, Cl, Br, I or CN and which may be substituted by one or more alkyl groups each having 1 to 4 carbon atoms; at the same time, two or more substituents R2 together may form a ring system.

2. Compound according to Claim 1, comprising at least one structure of the formulae (IIb) to (IId): where Z1, W1, W2, Y, X1, X2, X3 and R have the definitions given in Claim 1.

3. Compound according to Claim 1 or 2, comprising at least one structure of the formulae (III-1) to (III-56): where the symbols R, Z1, V, Y, X1, X2 X3 and X4 have the definitions given in Claim 1 and the further symbols are as follows: Z2 is B; Y1 is the same or different at each instance and is O, S, N(Ar'), N(R), C=O, C(R)2, Si(R)2, C=NR, C=NAr', C=C(R)2, B(Ar') oder B(R), where the symbols Ar' and R have the definitions given in Claim 1; X5 is the same or different at each instance and is N or CRe; Re is the same or different at each instance and is H, D, OH, F, Cl, Br, I, CN, NO2, N(Ar')2, N(R1)2, C(=O)N(Ar')2, C(=O)(R1)2, C(Ar')3, C(R1)3, Si(Ar')3, Si(R1)3, B(Ar')2, B(R1)2, C(=O)Ar', C(=O)R1, P(=O)(Ar')2, P(=O)(R1)2, P(Ar')2, P(R1)2, S(=O)Ar', S(=O)R1, S(=O)2Ar', S(=O)2R1, OSO2Ar', OSO2R1, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or an alkenyl or alkynyl group having 2 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 carbon atoms, where the alkyl, alkoxy, thioalkoxy, alkenyl or alkynyl group may each be substituted by one or more R1 radicals, where one or more nonadjacent CH2 groups may be replaced by R1C=CR1, C≡C, Si(R1)2, C=O, C=S, C=Se, C=NR1, -C(=O)O-, -C(=O)NR1-, NR1, P(=O)(R1), -O-, - S-, SO or SO2, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted in each case by one or more R1 radicals, or an aryloxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R1 radicals; it is also possible here for two Re radicals to form a ring system with one another or with a further group, where the symbols Ar' and R1 have the definitions given in Claim 1.

4. Compound according to one or more of Claims 1 to 3, comprising at least one structure of the formulae (IV-1) to (IV-56): where the symbols Z1, Y, V, R, Ra, Rb, Rc and Rd have the definitions given in Claim 1, the symbols Z2, Re and Y1 have the definitions given in Claim 3, the index l is 0, 1, 2, 3, 4 or 5, the index m is 0, 1, 2, 3 or 4 and the index j is 0, 1 or 2.

5. Compound according to one or more of Claims 1 to 4, characterized in that at least two R, Ra, Rb, Rc, Rd, Re radicals together with the further groups to which the two R, Ra, Rb, Rc, Rd, Re radicals bind form a fused ring, where the two R, Ra, Rb, Rc, Rd, Re radicals form at least one structure of the formulae (RA-1) to (RA-12): where R1 has the definition set out above, the dotted bonds represent the sites of attachment to the atoms of the groups to which the two R, Ra, Rc, Rd, Re radicals bind, and the further symbols are defined as follows: Y2 is the same or different at each instance and is C(R1)2, (R1)2C-C(R1)2, (R1)C=C(R1), NR1, NAr', O or S; Rf is the same or different at each instance and is F, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or an alkenyl or alkynyl group having 2 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 carbon atoms, where the alkyl, alkoxy, thioalkoxy, alkenyl or alkynyl group may in each case be substituted by one or more R2 radicals, where one or more nonadjacent CH2 groups may be replaced by R2C=CR2, C≡C, Si(R2)2, C=O, C=S, C=Se, C=NR2, -C(=O)O-, -C(=O)NR2-, NR2, P(=O)(R1), -O-, -S-, SO or SO2, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted in each case by one or more R2 radicals, or an aryloxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R2 radicals; at the same time, two Rf radicals together or one Rf radical together with an R1 radical or with a further group may also form a ring system; s is 0, 1, 2, 3, 4, 5 or 6; t is 0, 1, 2, 3, 4, 5, 6, 7 or 8; v is 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9.

6. Compound according to one or more of Claims 1 to 5, in that at least two R, Ra, Rb, Rc, Rd, Re radicals together with the further groups to which the two R, Ra, Rb, Rc, Rd, Re radicals bind form a fused ring, where the two R, Ra, Rb, Rc, Rd, Re radicals form structures of the formula (RB): where R1 has the definition set out in claim 1, the dotted bonds represent the sites of attachment to which the two R, Ra, Rb, Rc, Rd, Re radicals bind, the index m is 0, 1, 2, 3 or 4 and Y3 is C(R1)2, NR1, NAr', BR1, BAr', O or S.

7. Compound according to one or more of Claims 1 to 6, comprising at least one structure of the formulae (V-1) to (V-36), where the compounds have at least one fused ring: where the symbols Z1, Y, V, Ra, Rb, Rc and Rd have the definitions given in claim 1, the symbols Z2, Re and Y1 have the definitions given in claim 3, the symbol o represents the attachment sites, and the further symbols are defined as follows: l is 0, 1, 2, 3, 4 or 5; m is 0, 1, 2, 3 or 4; n is 0, 1, 2 or 3; j is 0, 1 or 2; and k is 0 or 1.

8. Oligomer, polymer or dendrimer containing one or more compounds according to any of Claims 1 to 7, wherein, in place of a hydrogen atom or a substituent, there are one or more bonds of the compounds to the polymer, oligomer or dendrimer.

9. Formulation comprising at least one compound according to one or more of Claims 1 to 7 or an oligomer, polymer or dendrimer according to Claim 8 and at least one further compound, where the further compound is preferably selected from one or more solvents.

10. Composition comprising at least one compound according to one or more of Claims 1 to 7 or an oligomer, polymer or dendrimer according to Claim 8 and at least one further compound selected from the group consisting of fluorescent emitters, phosphorescent emitters, emitters that exhibit TADF, host materials, electron transport materials, electron injection materials, hole conductor materials, hole injection materials, electron blocker materials and hole blocker materials.

11. Process for preparing a compound according to one or more of Claims 1 to 7, characterized in that a base skeleton having a Z1 group or a precursor of the Z1 group is synthesized, and at least one of the W1, W2 groups is introduced, preferably by means of a nucleophilic aromatic substitution reaction or a coupling reaction.

12. Use of a compound according to one or more of Claims 1 to 7 or an oligomer, polymer or dendrimer according to Claim 8 in an electronic device.

13. Electronic device comprising at least one compound according to one or more of Claims 1 to 7 or an oligomer, polymer or dendrimer according to Claim 8.