Organic light-emitting device

Abstract

The present invention relates to an organic electronic device especially an organic light- emitting device comprising a light-emitting layer comprising a hole-transporting OLED material of formula (1) and an electron-transporting OLED material selected from formula (2) and / or formula (3), and to a mixture of said host materials. The hole-transporting host material corresponds to a compound of the formula (1) from the class of indolocarbazoles. The electron-transporting host material corresponds to either a triazine of the formula (2) or a diazadibenzofuran or diazadibenzothiophene of the formula (3).

Description

[0001] P24-131 SC - 1 - Organic light-emitting device Subject-matter of the invention The present invention relates to an organic electronic device especially an organic light- 5 emitting device comprising a light-emitting layer comprising a hole-transporting host material of formula (1) and an electron-transporting host material selected from formula (2) or formula (3), and to a mixture of said host materials. The hole-transporting host material corresponds to a compound of the formula (1) from the class of indolocarbazoles. The electron-transporting host material corresponds to either a triazine of the formula (2) 10 or a diazadibenzofuran or diazadibenzothiophene of the formula (3). Background of the invention The structure of organic electroluminescent devices (e.g. OLEDs – organic light-emitting diodes or OLECs – organic light-emitting electrochemical cells) in which organic 15 semiconductors are used as functional materials has long been known. Emitting materials used here, aside from fluorescent emitters, are increasingly organometallic complexes which exhibit phosphorescence rather than fluorescence. In general terms, however, there is still a need for improvement in OLEDs, especially also in OLEDs which exhibit triplet emission (phosphorescence), for example with regard to efficiency, operating voltage and 20 lifetime. The properties of organic electroluminescent devices are not only determined by the emitters used. Also of particular significance here are especially the other materials used, such as host and matrix materials, hole blocker materials, electron transport materials, 25 hole transport materials and electron or exciton blocker materials, and among these especially the host or matrix materials. Improvements to these materials can lead to distinct improvements to electroluminescent devices. Host materials for use in organic electronic devices are well known to the person skilled in 30 the art. The term "matrix material" is also frequently used in the prior art when what is meant is a host material for phosphorescent emitters. This use of the term is also applicable to the present invention. In the meantime, a multitude of host materials has been developed both for fluorescent and for phosphorescent electronic devices. 35 WO13056776 A1 and US20150171357 A1 describe specific indolocarbazole derivatives as OLED materials. P24-131 SC - 2 - A further means of improving the performance data of electronic devices, especially of organic electroluminescent devices, is to use combinations of two or more materials, especially host materials or matrix materials. 5 US20170271598 A1, WO2021029616 A1, and WO2022182124 A1 describe dual host systems for OLEDs. However, there is still need for improvement in the case of use of these materials or in the case of use of mixtures of the materials, especially in relation to efficiency, operating 10 voltage and / or lifetime of the organic electroluminescent device. The capacitance of a device is an important parameter with regard to the achievable switching times of the device. As modern OLED screens are operated at ever higher refresh rates (from 60Hz in the past to 120Hz or even 240Hz today), short switching times 15 of OLED devices are essential. An important prerequisite for this is the lowest possible capacitance, both with regard to the operating voltage of the onset of the capacitance curve (beyond the level of the geometric capacitance) and with regard to the maximum capacitance signal. 20 The problem addressed by the present invention is therefore that of providing a combination of host materials which are suitable for use in an organic electroluminescent device, especially in a phosphorescent OLED, and lead to good device properties, especially with regard to an improved lifetime and / or a low operating voltage and / or a good capacitance, and that of providing the corresponding electroluminescent device. 25 It has now been found that this problem is solved, and the disadvantages from the prior art are eliminated, by the combination of at least one compound of the formula (1) as first host material and at least one electron-transporting compound of the formula (2) or of the formula (3) as second host material in a light-emitting layer of an organic 30 electroluminescent device. The use of such a material combination for production of the light-emitting layer in an organic electroluminescent device leads to very good properties of these devices, especially with regard to lifetime, especially with equal or improved efficiency and / or operating voltage. The advantages are especially also manifested in the presence of a light-emitting component in the emission layer, especially in the case of 35 combination with emitters or in combination with arylamines, e.g. of the formulae (I-A) or (I-B) or preferred embodiments thereof in the hole injection layer and / or hole transport layer and / or electron blocking layer. P24-131 SC - 3 - y of the invention The present invention therefore first provides an organic light-emitting device comprising an anode, a cathode and at least one organic layer containing at least one light-emitting layer, wherein the at least one light-emitting layer contains at least one compound of the 5 formula (1) as host material 1 and at least one compound of the formula (2) and / or of the formula (3) as host material 2, 10 15 20 25 30 formula (3), where (R)a, (R)b, (R)c, stands on each occurrence identically or differently for a mono- 35 subsitution, a di-substitution, a tri-substitution, a maximum possible substitution with the substituent R, or for no-substitution; R stands for D, a straight or branched alkyl group having 1 to 10 carbon atoms, a heteroaryl group which has 5 to 30 ring atoms or an aryl group which has 6 to 30 P24-131 SC - 4 - carbon atoms and both heteroaryl or aryl group may be substituted by one or more R# radicals; R# stands for D, F, CN, or non-deuterated, partially or fully deuterated phenyl;; L is a single bond or an aromatic divalent linker having 6 to 30 ring atoms and may 5 be substituted in each case by one or more R# radicals; Ar* is an aryl group having 12 to 24 carbon atoms or a heteroaryl group which has 10 to 40 ring atoms and both aryl or heteroaryl group may be substituted by one or more R# radicals; X stands on each occurrence, identically or differently, for N or CR6; 10 L2is the same or different at each instance and is a single bond or an aromatic or heteroaromatic ring system which has 5 to 24 ring atoms and may be substituted in each case by one or more R7radicals; R## is the same or different instance and is D, F, CN or an aromatic ring system which has 6 to 24 ring atoms and may be substituted by one or more R6radicals, and two 15 adjacent substituents R## together may form an aromatic, heteroaromatic, aliphatic, heteroaliphatic ring system that may be substituted by one or more R7radicals; Y is the same or different at each instance and is N or CR9, with exclusion of the possibility that two Y alongside one another are both N; 20 V2is O or S; R6at each instance is the same or different and is D, F, CN, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or 25 more R7radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R7)2, C=O, NR7, O, S or CONR7, or an aromatic or heteroaromatic ring system which has 5 to 60 ring atoms and which may be partially or completely deuterated in each case; it is also possible here for two R6radicals together to form an aromatic, heteroaromatic, aliphatic, or heteroaliphatic ring system; 30 Ar5is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted by one or more R7radicals; R7is the same or different at each instance and is D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a 35 straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R8radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or P24-131 SC - 5 - heteroaromatic ring system which has 5 to 40 ring atoms and which may be partially or completely deuterated in each case; at the same time, two or more R7radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; 5 R8is the same or different at each instance and is H, D, F or an aliphatic, aromatic or heteroaromatic organic radical, especially a hydrocarbyl radical, having 1 to 20 carbon atoms, in which one or more hydrogen atoms may also be replaced by F; R9is the same or different at each instance and is H, D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a 10 straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R6radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or 15 heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted in each case by one or more R6radicals; at the same time, two or more R9radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; b2 is 0, 1, 2 or 3. 20 The invention therefore further provides a mixture comprising at least one compound of formula (1) and at least one compound of the formula (2) and / or of the formula (3), 25 30 35 formula (1), P24-131 SC - 6 - 5 10 where the symbols and indices used are as follows: 15 (R)a, (R)b, (R)c, stands on each occurrence identically or differently for a mono- subsitution, a di-substitution, a tri-substitution, a maximum possible substitution with the substituent R, or for no-substitution; R stands for D, a straight or branched alkyl group having 1 to 10 carbon atoms, a heteroaryl group which has 5 to 30 ring atoms or an aryl group which has 6 to 30 20 carbon atoms and both heteroaryl or aryl group may be substituted by one or more R# radicals; R# stands for D, F, CN, or non-deuterated, partially or fully deuterated phenyl; L is a single bond or an aromatic divalent linker having 6 to 30 ring atoms and may be substituted in each case by one or more R# radicals; 25 Ar* is an aryl group having 12 to 24 carbon atoms or a heteroaryl group which has 10 to 40 ring atoms and both aryl or heteroaryl group may be substituted by one or more R# radicals; X stands on each occurrence, identically or differently, for N or CR6; L2is the same or different at each instance and is a single bond or an aromatic or 30 heteroaromatic ring system which has 5 to 24 ring atoms and may be substituted in each case by one or more R7radicals; R## is the same or different instance and is D, F, CN or an aromatic ring system which has 6 to 24 ring atoms and may be substituted by one or more R6radicals, and two adjacent substituents R## together may form an aromatic, heteroaromatic, 35 aliphatic, heteroaliphatic ring system that may be substituted by one or more R7radicals; Y is the same or different at each instance and is N or CR9, with exclusion of the possibility that two Y alongside one another are both N; P24-131 SC - 7 - V2is O or S; R6at each instance is the same or different and is D, F, CN, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, 5 where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R7radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R7)2, C=O, NR7, O, S or CONR7, or an aromatic or heteroaromatic ring system which has 5 to 60 ring atoms and which may be partially or completely deuterated in each case; it is also possible here for two R6radicals together to 10 form an aromatic, heteroaromatic, aliphatic, or heteroaliphatic ring system; Ar5is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted by one or more R7radicals; R7is the same or different at each instance and is D, F, Cl, Br, I, N(R8)2, CN, NO2, 15 OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R8radicals and where one or more nonadjacent CH2 20 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and which may be partially or completely deuterated in each case; at the same time, two or more R7radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; 25 R8is the same or different at each instance and is H, D, F or an aliphatic, aromatic or heteroaromatic organic radical, especially a hydrocarbyl radical, having 1 to 20 carbon atoms, in which one or more hydrogen atoms may also be replaced by F; R9is the same or different at each instance and is H, D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a 30 straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R6radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or 35 heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted in each case by one or more R6radicals; at the same time, two or more R9radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; b2 is 0, 1, 2 or 3. P24-131 SC - 8 - The invention further provides a process for producing the organic light-emitting devices and specific further mixtures, and specific material combinations. The corresponding preferred embodiments as described hereinafter likewise form part of the subject-matter of the present invention. The surprising and advantageous effects are achieved through 5 specific selection of the compounds of the formula (1) and the compounds of the formulae (2) or (3). The surprising and advantageous effects are further achieved through specific selection of the compounds of the formula (1) and the compounds of the formulae (2) or (3), preferably together with specific arylamines selected from monoamines or diamines in the hole injection layer and / or hole transport layer and / or electron blocking layer as further 10 described hereinbelow. Detailed description of the invention As utilized herein, the term “and / or” or “or” may include any and all combinations of one or more of the associated listed items. Throughout the disclosure, the expression such as “at 15 least one of”, “one of”, and s”selected from”, when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. In the present disclosure, "D" or "D atom" denotes deuterium. The degree of deuteration, expressed in mol%, means the proportion of H atoms that are replaced by deuterium. 20 Since deuterated compounds are often a mixture of compounds that differ in the exact position and the exact proportion of D atoms, the degree of deuteration denotes the average proportion of H atoms that are replaced by D. With a degree of deuteration of 50 mol%, an average of 50 mol% of the H atoms in the compound are replaced by D, so that the degree of deuteration is average. 25 The organic light-emitting device of the invention is, for example, an organic light-emitting transistor (OLET), an organic field quench device (OFQD), an organic light-emitting electrochemical cell (OLEC), an organic laser diode (O-laser) or an organic light-emitting diode (OLED). The organic light-emitting device or synonymously organic 30 electroluminescent device of the invention is especially an organic light-emitting diode or an organic light-emitting electrochemical cell. The device of the invention is more preferably an OLED. The organic layer of the device of the invention that comprises the light-emitting layer comprising the material combination of at least one compound of the formula (1) and at 35 least one compound of the formulae (2) and / or (3), as described or described above or hereinafter, preferably comprises, in addition to this light-emitting layer (EML), a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), an electron transport layer (ETL), an electron injection layer (EIL) and / or a hole blocker layer (HBL), and / or an exciton blocking layer and / or charge generation layers. It is also possible P24-131 SC - 9 - for the device of the invention to include multiple layers from this group selected from EML, HIL, HTL, EBL, ETL, EIL and HBL. The organic electroluminescent device (organic light-emitting device is interchangeable) of the invention may contain two or more light-emitting layers. At least one of the light- 5 emitting layers is the light-emitting layer of the invention. It is particularly preferable when these emission layers in this case altogether exhibit a plurality of emission maxima between 380 nm and 750 nm, so that altogether white emission results. It should be noted that, for the production of white light, rather than a plurality of emitter compounds, an emitter compound used individually which emits over a broad wavelength range may also 10 be suitable. Systems with three emitting layers are particularly preferred, whereby the three layers show blue, green, and orange or red emission. As an alternative to the combination described above, a light-emitting layer can also show yellow emission. Such combinations are known in the art. The organic electroluminescence device according to the invention can also be a tandem electroluminescence device, in particular for white- 15 emitting OLEDs. However, the device may also comprise inorganic materials or else layers formed entirely from inorganic materials. It is preferable when the organic layer of the device of the invention comprises a hole 20 injection layer and / or a hole transport layer and / or an electron blocking layer wherein the hole-injecting material and / or hole-transporting material and / or electron blocking material is a monoamine or diamine that does not contain a carbazole unit. A suitable selection of monoamine or diamine compounds and preferred compounds is described hereinbelow. 25 It is preferable when the light-emitting layer comprising at least one compound of the formula (1) and at least one compound of the formulae (2) or (3) comprises at least one further compound selected from the group of matrix materials, phosphorescent emitters, fluorescent emitters and / or emitters having thermally activated delayed fluorescence. A suitable selection of matrix materials and emitters is described hereinafter. 30 It is preferable when the light-emitting layer comprising at least one compound of the formula (1) and at least one compound of the formulae (2) and / or (3) comprises at least one phosphorescent emitter. A suitable selection of phosphorescent emitters and preferred phosphorescent emitters is described hereinafter. 35 An aryl group in the context of this invention contains 6 to 40 aromatic ring atoms, preferably carbon atoms. A heteroaryl group in the context of this invention contains 5 to 40 aromatic ring atoms, where the ring atoms include carbon atoms and at least one heteroatom, with the proviso that the sum total of carbon atoms and heteroatoms adds up P24-131 SC - 10 - to at least 5. The heteroatoms are preferably selected from N, O and / or S. An aryl group is understood here to mean either a simple aromatic cycle, i.e. phenyl, derived from benzene, or a fused aryl group, i.e. derived from naphthalene, anthracene, phenanthrene, triphenylene, but also includes aromatic ring systems such as biphenyl, terphenyl, 5 quaterphenyl, dimethylfluorenyl, diphenylfluorenyl or spirobifluorenyl. A heteroaryl group is understood here to mean a simple heteroaromatic cycle, for example derived from pyridine, pyrimidine or thiophene, or a fused heteroaryl group, for example derived from dibenzofurane, dibenzothiophene, carbazole, quinoline or isoquinoline, but also includes heteroaromatic ring systems such as bipyridyl. An aryl group having 6 to 18 carbon atoms 10 is therefore preferably phenyl, naphthyl, phenanthryl, biphenyl, terphenyl or triphenylenyl with no restriction in the attachment of the aryl group as substituent. The aryl or heteroaryl group in the context of this invention may bear one or more radicals, where the substituent is described below. If no such substituent is described, the aryl group or heteroaryl group is not substituted. The aryl and heteroaryl groups are preferably partially deuterated or 15 fully deuterated. An aryl group (synonymously used an aromatic ring system) or a heteroaryl group (synonymously used a heteroaromatic ring system) which has 5-40 ring atoms and may be joined to the aromatic or heteroaromatic system via any desired positions is 20 understood to mean, for example, groups derived from benzene, naphthalene, anthracene, benzanthracene, phenanthrene, benzophenanthrene, pyrene, chrysene, perylene, fluoranthene, benzofluoranthene, naphthacene, pentacene, benzopyrene, biphenyl, biphenylene, terphenyl, terphenylene, fluorene, spirobifluorene, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis- or trans-indenofluorene, cis- 25 or trans-monobenzoindenofluorene, cis- or trans-dibenzoindenofluorene, truxene, isotruxene, spirotruxene, spiroisotruxene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole, indole, isoindole, carbazole, indolocarbazole, indenocarbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, 30 phenothiazine, phenoxazine, pyrazole, indazole, imidazole, benzimidazole, naphthimidazole, phenanthrimidazole, pyridimidazole, pyrazinimidazole, quinoxalinimidazole, oxazole, benzoxazole, naphthoxazole, anthroxazole, phenanthroxazole, isoxazole, 1,2-thiazole, 1,3-thiazole, benzothiazole, pyridazine, benzopyridazine, pyrimidine, benzopyrimidine, quinoxaline, 1,5-diazaanthracene, 2,7- 35 diazapyrene, 2,3-diazapyrene, 1,6-diazapyrene, 1,8-diazapyrene, 4,5-diazapyrene, 4,5,9,10-tetraazaperylene, pyrazine, phenazine, phenoxazine, phenothiazine, fluorubine, naphthyridine, azacarbazole, benzocarboline, phenanthroline, 1,2,3-triazole, 1,2,4- triazole, benzotriazole, 1,2,3-oxadiazole, 1,2,4-oxadiazole, 1,2,5-oxadiazole, 1,3,4- oxadiazole, 1,2,3-thiadiazole, 1,2,4-thiadiazole, 1,2,5-thiadiazole, 1,3,4-thiadiazole, 1,3,5- P24-131 SC - 11 - triazine, 1,2,4-triazine, 1,2,3-triazine, tetrazole, 1,2,4,5-tetrazine, 1,2,3,4-tetrazine, 1,2,3,5- tetrazine, purine, pteridine, indolizine and benzothiadiazole. An aromatic ring system having 6 to 18 carbon atoms as ring atoms is preferably selected from phenyl, 1,2-biphenyl, 1,3-biphenyl, 1,4-biphenyl, dimethylfluorenyl, naphthyl, 5 phenanthryl and triphenylenyl, which may be substituted by one or more radicals, where the substituent is described hereinafter. A preferred heteroaromatic ring system having 10 to 18 ring atoms is preferably selected from dibenzofuranyl and dibenzothiophenyl, which may be substituted by one or more radicals, where the substituent is described hereinafter. 10 A cyclic alkyl group in the context of this invention is understood to mean a monocyclic, bicyclic or polycyclic group. In the context of the present invention, a straight-chain, branched or cyclic C1- to C20-alkyl group is understood to mean, for example, the methyl, ethyl, n-propyl, i-propyl, 15 cyclopropyl, n-butyl, i-butyl, s-butyl, t-butyl, cyclobutyl, 2-methylbutyl, n-pentyl, s-pentyl, t- pentyl, 2-pentyl, neopentyl, cyclopentyl, n-hexyl, s-hexyl, t-hexyl, 2-hexyl, 3-hexyl, neohexyl, cyclohexyl, 1-methylcyclopentyl, 2-methylpentyl, n-heptyl, 2-heptyl, 3-heptyl, 4- heptyl, cycloheptyl, 1-methylcyclohexyl, n-octyl, 2-ethylhexyl, cyclooctyl, 1- bicyclo[2.2.2]octyl, 2-bicyclo[2.2.2]octyl, 2-(2,6-dimethyl)octyl, 3-(3,7-dimethyl)octyl, 20 adamantyl, trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl, 1,1-dimethyl-n-hex-1-yl, 1,1-dimethyl-n-hept-1-yl, 1,1-dimethyl-n-oct-1-yl, 1,1-dimethyl-n-dec-1-yl, 1,1-dimethyl-n- dodec-1-yl, 1,1-dimethyl-n-tetradec-1-yl, 1,1-dimethyl-n-hexadec-1-yl, 1,1-dimethyl-n- octadec-1-yl, 1,1-diethyl-n-hex-1-yl, 1,1-diethyl-n-hept-1-yl, 1,1-diethyl-n-oct-1-yl, 1,1- diethyl-n-dec-1-yl, 1,1-diethyl-n-dodec-1-yl, 1,1-diethyl-n-tetradec-1-yl, 1,1-diethyl-n- 25 hexadec-1-yl, 1,1-diethyl-n-octadec-1-yl, 1-(n-propyl)cyclohex-1-yl, 1-(n-butyl)cyclohex-1- yl, 1-(n-hexyl)cyclohex-1-yl, 1-(n-octyl)cyclohex-1-yl and 1-(n-decyl)cyclohex-1-yl radicals. The abbreviation Ar* is an aryl group having 12 to 24 carbon atoms or a heteroaryl group which has 10 to 40 ring atoms and both aryl or heteroaryl group may be substituted by 30 one or more R# radicals, where the R# radical is defined as described above or hereinafter. The abbreviation Ar5is the same or different at each instance and is an aryl group or heteroaryl group which has 5 to 40 ring atoms and may be substituted by one or more R735 radicals, where the R7radical is defined as described above or hereinafter. The abbreviation Ar4stands for phenyl, biphenyl and terphenyl which may be partially or fully deuterated. P24-131 SC - 12 - The abbreviation Ar stands for phenylene which may be partially or fully deuterated. The term phenylene includes ortho-, meta- and para-phenylene. In the context of the present invention, a straight-chain, branched or cyclic alkenyl group is 5 understood to mean ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclo- hexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl or cyclooctadienyl. In the context of the present invention, a straight-chain, branched or cyclic alkynyl group is understood to mean ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl or octynyl. 10 When the host materials of the light-emitting layer comprising at least one compound of the formula (1) as described above or described as preferred hereinafter and at least one compound of the formulae (2) and / or (3) as described above or described hereinafter are used for a phosphorescent emitter, it is preferable when the triplet energy thereof is not significantly less than the triplet energy of the phosphorescent emitter. In respect of the 15 triplet level, it is preferably the case that T1(emitter) – T1(matrix) ≤ 0.2 eV, more preferably ≤ 0.15 eV, most preferably ≤ 0.1 eV. T1(matrix) here is the triplet level of the matrix material in the emission layer, this condition being applicable to each of the at least two matrix materials, and T1(emitter) is the triplet level of the phosphorescent emitter. If the emission layer contains more than two matrix materials, the abovementioned relationship 20 is preferably also applicable to every further matrix material. There follows a description of the host material 1 and its preferred embodiments that is / are present in the device of the invention. The preferred embodiments of the host material 1 of the formula (1) are also applicable to the mixture of the invention. 25 Preferred compounds of formula (1) are compounds of formulae (1a) to (1e), 30 35 formula (1b), P24-131 SC - 13 - 5 10 15 20 where (R)a, (R)b, (R)c, R, L and Ar* have a meaning as described before or preferably described before. The invention further provides the organic light-emitting device as described above, wherein the host material 1 conforms to at least one of the formulae (1a), (1b), (1c), (1d), 25 and (1e) as described above. In a preferred embodiment of the light-emitting device or mixture according to the invention, the host material 1 is selected from compounds of formulae (1a), (1b) and (1d) as described before. 30 In compounds of the formulae (1), (1a), (1b), (1c), (1d) and (1e), Ar* is preferably selected from the group of Ar-1 to Ar-20, 35 ,, , P24-131 SC - 15 - 5 , , where the symbols and indices used are as follows: 10 Y3is O, S, NAr4or C(R5)2, R3is H or R#; the dashed bond is the bond to the rest of the formulae (1), (1a), (1b), (1c), (1d) and (1e); R5is methyl or phenyl which may be partially or fully deuterated or two R5are bonded to form a spirobifluorenyl which may be partially or fully deuterated; 15 Ar means phenylene which may be partially or fully deuterated; m is 0 or 1 and Ar4is phenyl, biphenyl or terphenyl which may be partially or fully deuterated. R3is preferably H, D, or non-deuterated, partially or fully deuterated phenyl. 20 In Y3, R5is preferably methyl. In Ar-15 to Ar-18, Y3is preferably O or NAr4. In Ar-15 to Ar-18, m is preferably 0. 25 In Ar-1 to Ar-20, R3is preferably H or D. Within the group of Ar-1 to Ar-20, the groups Ar-1, Ar-2, Ar-15, Ar-16, Ar-17 and / or Ar-18 are preferred where the symbols and indices used have the meaning as described or preferably described before. 30 In compounds of the formulae (1), (1a), (1b), (1c), (1d) and (1e), Ar* is therefore particularly preferably selected from the group of Ar-1, Ar-2, Ar-15, Ar-16, Ar-17 and Ar-18 where the symbols and indices used have the meaning as described or preferably described before. 35 In a preferred embodiment of the light-emitting device or mixture according to the invention, L in the formulae (1), (1a), (1b), (1c), (1d) and (1e) of host material 1 is a bond. P24-131 SC - 16 - In a preferred embodiment of the light-emitting device or mixture according to the invention, L in the formulae (1), (1a), (1b), (1c), (1d) and (1e) of host material 1 is a divalent linker selected from L-1 to L-3, 5 L-1 L-2 L-3, where L-1, L-2 and L-3 may be substituted by one or more R# radicals where R# has a meaning as described before. 10 In L-1, L2 and L-3, R# is preferably D. In compounds of the formulae (1), (1a), (1b), (1c), (1d) and (1e) or in preferred compounds of the formulae (1), (1a), (1b), (1c), (1d) and (1e), R stands preferably for D, methyl, ethyl, tert-butyl, phenyl, where H atoms of said alkyl or aryl groups may be 15 substituted through R# where R# has a meaning as described before. R# within substituent R is preferably D. In a preferred embodiment of the light-emitting device or mixture according to the invention, the host material 1 according to compounds of formulae (1), (1a), (1b), (1c), 20 (1d) and (1e) as described before or preferably described before is partially or fully deuterated. If the compounds of formulae (1), (1a), (1b), (1c), (1d) and (1e). are deuterated compounds, it is possible in their preparation, if the preparation is chosen by reacting a 25 non-deuterated compound of one of formulae (1), (1a), (1b), (1c), (1d) and (1e) with a source of deuteration or if deuterated starting compounds are chosen in the preparation which are a mixture of deuterated starting compounds, to obtain a mixture of deuterated products of the same basic chemical structure which differ only in the degree of deuteration and / or the deuteration patterns. 30 Such mixtures of deuterated compounds of the same basic chemical structure of formula (1) or of the basic structure of the preferred embodiments, which differ only in the degree of deuteration and / or the deuteration patterns, are understood by the term “at least one compound of formula (1)” within the meaning of the invention. 35 In a preferred embodiment of the at least one compound of formulae (1), (1a), (1b), (1c), (1d) and (1e), as previously described or preferably described, the average degree of deuteration is at least 50 mol% to 90 mol%, more preferably 70 mol% to 100 mol%. P24-131 SC - 17 - Corresponding deuteration methods are known to the person skilled in the art and are described, for example, in KR2016041014 A, WO2017 / 122988 A1, KR2020052820 A, KR101978651 B1 and WO2018 / 110887 A1 or in Bulletin of the Chemical Society of 5 Japan, 2021, 94(2), 600-605 or Asian Journal of Organic Chemistry, 2017, 6(8), 1063- 1071. A suitable method of deuterating a compound by exchange of one or more hydrogen atoms for deuterium atoms is a treatment of the compound to be deuterated in the 10 presence of a platinum catalyst or palladium catalyst and a deuterium source. The term “deuterium source” means any compound that contains one or more deuterium atoms and is able to release them under suitable conditions. The platinum catalyst is preferably dry platinum on charcoal, preferably 5% dry platinum 15 on charcoal. The palladium catalyst is preferably dry palladium on charcoal, preferably 5% dry palladium on charcoal. A suitable deuterium source is D2O, benzene-d6, chloroform-d, acetonitrile-d3, acetone-d6, acetic acid-d4, methanol-d4 or toluene-d8. A preferred deuterium source is D2O or a combination of D2O and a fully deuterated organic solvent. A particularly preferred deuterium source is the combination of D2O with a fully deuterated 20 organic solvent, where the fully deuterated solvent here is not restricted. Particularly suitable fully deuterated solvents are benzene-d6 and toluene-d8. A particularly preferred deuterium source is a combination of D2O and toluene-d8. The reaction is preferably conducted with heating, more preferably with heating to temperatures between 100°C and 200°C.In addition, the reaction is preferably conducted under pressure.] 25 Examples of suitable host materials of the formulae (1), (1a), (1b), (1c), (1d) and (1e) are the structures given below in table 1. Table 1: 30 35 P24-131 SC - 34 - 5 10 15 20 25 In the above Table 1, the specification D0-D30, for example, means the number of D atoms in the respective compound and represents D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, 30 and D30. The number of D atoms is 0 for D0 and 30 for D30. Particularly suitable compounds of the formulae (1), (1a), (1b), (1c), (1d) and (1e) are the compounds H1 to H48 of table 2. 35 P24-131 SC - 35 - 5 10 15 20 25 30 35 P24-131 SC - 36 - 5 10 15 20 25 30 35 P24-131 SC - 37 - 5 H28 10 15 H31 N N 20 N H34 25 30 H37 35 P24-131 SC - 38 - 5 10 15 20 25 30 The compounds in Tables 1 and 2 are shown in part as fully deuterated compounds for the sake of simplification, whereby these are generally intended to denote compounds that have a degree of deuteration of at least 50 mol%. The degree of deuteration for said 35 fully deuterated compounds in Tables 1 and 2 is therefore between 50 mol% and 100 mol% or has a preferred deuteration degree as described herein. For partially deuterated compounds, a D atom means that the corresponding position in the molecule has a degree of deuteration of at least 40 mol%. P24-131 SC - 39 - The preparation of the compounds of the formulae (1), (1a), (1b), (1c), (1d), (1e) or of the compounds from table 1 and of the compounds H1 to H48 is known to those skilled in the art. The compounds may be prepared by synthesis steps known to the person skilled in the art, for example halogenation, preferably bromination, and a subsequent 5 organometallic coupling reaction, for example Suzuki coupling, Heck coupling or Hartwig- Buchwald coupling. Scheme 1: 10 15 20 25 30 There follows a description of the host material 2 and its preferred embodiments that is / are present in the device of the invention. The preferred embodiments of the host material 2 of the formulae (2) or (3) are also applicable to the mixture of the invention. In one embodiment of the invention, for the device of the invention, compounds of the formula (2) or of the formula (3) as described above are selected, and these are used in 35 the light-emitting layer with compounds of the formula (1) as described above or described as preferred or with the compounds from table 1 or the compounds H1 to H48. Suitable compounds of the formula (2) are known, for example, from the following publications: WO2007 / 077810A1, WO2008 / 056746A1, WO2010 / 136109A1, P24-131 SC - 40 - WO2011 / 057706A2, WO2011 / 160757A1, WO2012 / 023947A1, WO2012 / 048781A1, WO2013 / 077352A1, WO2013147205A1, WO2013 / 083216A1, WO2014 / 094963A1, WO2014 / 007564A1, WO2014 / 015931A1, WO2015 / 090504A2, WO2015 / 105251A1, WO2015 / 169412A1, WO2016 / 015810A1, WO2016 / 013875A1, WO2016 / 010402A1, 5 WO2016 / 033167A1, WO2017 / 178311A1, WO2017 / 076485A1, WO2017 / 186760A1, WO2018 / 004096A1, WO2018 / 016742A1, WO2018 / 123783A1, WO2018 / 159964A1, WO2018 / 174678A1, WO2018 / 174679A1, WO2018 / 174681A1, WO2018 / 174682A1, WO2019 / 177407A1, WO2019 / 245164A1, WO2019 / 240473A1, WO2019 / 017730A1, WO2019 / 017731A1, WO2019 / 017734A1, WO2019 / 145316A1, 10 WO2019 / 121458A1,WO2020 / 130381A1, WO2020 / 130509A1, WO2020 / 169241A1, WO2020 / 141949A1, WO2021 / 066623A1, WO2021 / 101220A1, WO2021 / 037401A1, WO2021 / 180614A1, WO2021 / 239772A1, WO2022 / 015084A1, WO2022 / 025714A1, WO2022 / 055169A1, EP3575296A1, EP3591728A1, US2014 / 0361254A1, US2014 / 0361268A1, KR20210036304A, KR20210036857A, KR2021147993A, 15 JP2011 / 160367A2 and JP2017 / 107992A2. Particularly suitable compounds of formula (2) are compounds of WO2015 / 169412A1, described on pages 28 to 63, 93 and 110 to 114, compounds of WO2019 / 007866A1, described in tables 1 to 8 on pages 37 to 100, compounds of WO2019 / 096717A2, 20 described in table 1 on pages 27 to 33 and compounds described on pages 96 to 102, compounds of WO2019 / 229011A1, described in tables 1 and 2 on pages 31 to 117 and compound described on pages 251 to 254, compounds of WO2021 / 037401A1, described on pages 31 to 64 and compounds P1 to P110 on pages 132 to 144, compounds of WO2020 / 169241A1, described in table 1 on pages 30 to 73 and compounds 1 to 36 and 25 67 to 81 on pages 74 to 78 and compounds described on pages 223 to 231, compounds of WO2023247662A1, described in tables 1 and 2 on pages 18 to 23 and compounds described on pages 100 to 102, compounds of WO2023247663A1, described in tables 1 and 2 on pages 43 to 58 and compounds described on pages 151 to 173, compounds of US2023172065 A, described on pages 6 to 413 and 435 to 498, compounds of 30 WO2016 / 015810A1, described on pages 27 to 34, 51 to 56 and 61 to 64, compounds of WO18174678 A1, described on pages 20 to 32 and 38 to 50, compounds of WO18174681 A1, described on pages 20 to 32 and 42 to 61, compounds of WO2021 / 052921A1, described in table 1 on pages 20 to 27, compounds 1 to 11 and 29 to 44 on pages 27 to 31 and compounds described on pages 122 to 125, compounds of 35 WO2017 / 178311A1, described on pages 37 to 44 and compounds described on pages 97 to 105, compounds of WO2010 / 136109A1, described on pages 32 to and compounds described in examples 1 to 54 on pages 74 to 139, compounds of WO2011 / 000455A1, described on pages 19 to 32 and compounds described in examples 1 to 7a on pages 51 P24-131 SC - 41 - to 59, compounds of WO2021 / 239772A1, described in table 1 on pages 27 to 120 and compounds E55 to E60 on pages 223 to 224 and E61 described on page 227. Suitable compounds of the formula (3) are known, for example, from the following 5 publications: WO2015 / 182872A1, WO2015 / 105316A1, WO2017 / 109637A1, WO2018 / 060307A1, WO2018 / 151479A2, WO2018 / 088665A2, WO2018 / 060218A1, WO2018 / 234932A1, WO2019 / 058200A1, WO2019 / 017730A1, WO2019 / 017731A1, WO2019 / 066282A1, WO2019 / 059577A1, WO2020 / 141949A1, WO2020 / 067657A1, WO2022063744A1, WO2022 / 090108A1, WO2022 / 207678A1, WO2023061998A1, 10 KR20170139443A, KR20190036867A, KR2019035308A, KR2021147993A, CN110294753A, CN110437241A, US2016 / 072078A1, US2019 / 148646A1. Preferred compounds of formula (2) as host material 2 to be used according to the invention are compounds of formulae (2a) to (2d), 15 20 25 30 ormua ( ); 35 P24-131 SC - 42 - 5 10 15 20 rmula (2d), where the symbols and indices for these formulae are defined as follows: W, W1are the same or different at each instance and are O, S, C(RW)2 or N-Ar5; 25 RWis the same or different at each instance and is a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where one or more hydrogen atoms may be replaced by D, F or CN, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted by one or more substituents selected from D, F, 30 CN, a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where one or more hydrogen atoms in the alkyl group on the aromatic or heteroaromatic ring system may be replaced by D, F or CN; at the same time, the two RWradicals that bind to the same carbon atom may also form a ring system with one another; 35 A is the same or different at each instance and is CR7or N, where not more than two A groups per cycle are N and where A is C when L2is bonded to that position; a3 is the same or different at each instance and is 0, 1, 2, 3 or 4; P24-131 SC - 43 - b3 is the same or different at each instance and is 0, 1, 2 or 3; Ring B is derived from an aryl group which has 6 to 20 ring atoms and may be5 substituted by one or more substituents R##; 10 L3is an aromatic ring system having 6 to 40 ring atoms or a heteroaromatic ring system having 5 to 40 ring atoms, which may be substituted by one or more R7radicals; and 15 where L2, X, Ar5, R7and R## have the definitions as described before. X is preferably N. In compounds of the formula (2a), W is preferably O or N-Ar5. 20 In compounds of the formula (2a), A is preferably the same or different at each instance and is CR7, where A is C when L2is bonded to that position. In one preferred embodiment of compounds of formulae (2) or (2a) W is N-Ar5and L2is preferably selected from L-1 to L-13 which may be substituted by one or more radicals R7, 25 30 35 P24-131 SC - 44 - 5 10 , where the dashed bonds are the bonds to the rest of formulae (2) or (2a) and where R7has a meaning as described before or hereinafter. Within L-1 to L-13, R7is preferably D. 15 Particularly preferred compounds of the formulae (2) and (2a) are the compounds of the 20 25 30 - ), 35 P24-131 SC - 45 - 5 10 15 20 25 30 35 P24-131 SC - 46 - 5 formula (2a-7), 10 where the symbols and indices for these formulae are defined as follows: Ar# is the same or different at each instance and is an aromatic ring system which has 6 to 40 ring atoms and may be substituted by one or more R7radicals L5is a single bond or an aromatic ring system which has 6 to 40 ring atoms and may be substituted in each case by one or more R7radicals; 15 (R7)x, (R7)y, (R7)x1, (R7)y1 represent a monosubstitution, a disubstitution, a trisubstitution or the maximum permissible substitution with the radical R7, R18is the same or different at each instance and is a straight-chain alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 12 carbon atoms, where two radicals R18together may form a monocyclic or polycyclic, aliphatic, aromatic or 20 heteroaromatic ring system which may be substituted by one or more R7radicals, where X, L2, Ar5and R7have a previously mentioned or a previously and subsequently preferred definition. In compounds of the formulae (2a-1) to (2a-7), all X are preferably N. 25 In compounds of the formulae (2a-1) to (2a-4), the linkers L2and L5are preferably a bond. In compounds of the formula (2a-5), the linker L2is preferably a bond. In compounds of the formulae (2a-6) and (2a-7), one of the linkers L2is preferably selected from L-1 to L-13 which may be substituted by one or more radicals R7as 30 described before or preferably described before. In compounds of the formulae (2a-6) and (2a-7), one of the linkers L2is particularly preferably selected from L-12 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. Said one linker L2is preferably bonded to the diazadibenzofuran or diazadibenzothiophene moiety. The further linkers L2within compounds of formula (2a-6) 35 and (2a-7) are preferably a bond. In compounds of the formulae (2a-1), (2a-2), (2a-3), (2a-4) and (2a-5), the radicals R7in (R7)x, (R7)y, (R7)x1, (R7)y1 are preferably as indicated below when they occur, and are most preferably D. P24-131 SC - 47 - In compounds of the formulae (2a-6) and (2a-7), the radicals R7in (R7)x are preferably as indicated below when they occur, most preferably D. In compounds of the formulae (2a-6) and (2a-7), the radicals R7in (R7)yare preferably as indicated before when they occur, and are most preferably a non-deuterated, partially or fully deuterated aryl group having 6 5 to 18 C atoms. Preferred compound of the formulae (2) and (2b) are compounds in which one of the linkers L2is preferably selected from L-1 to L-13 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. In 10 compounds of the formula (2b), one of the linkers L2is particularly preferably selected from L-1, L-2, L-3, L-8, L-9, L-12 and L-13 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. In compounds of the formula (2b), one of the linkers L2is particularly preferably selected from L-12 which may be substituted by one or more radicals R7as described before or 15 preferably described before or hereinafter. In compounds of the formulae (2b), one of the linkers L2is particularly preferably selected from L-9 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. Said one linker L2is preferably bonded to the 4H-Naphtho[1,2,3,4-def]carbazole moiety of the compounds of formula (2b). The further linkers L2within compounds of formula (2b) are 20 preferably a bond. Preferred compounds of the formula (2b) are the compounds of the formula (2b-1), 25 30 formula (2b-1), where Ar5, L2, R##, a3, X, (R7)x, (R7)y and (R7)x1 have a meaning as described before or as preferably described herein. 35 Alternatively, preferred compounds of the formulae (2) and (2b) are compounds in which all linkers L2are a single bond. P24-131 SC - 48 - Preferred compound of the formulae (2) and (2c) are compounds in which W1is preferably selected from O or C(RW)2, where RWhas a meaning as described before. In this embodiment it is preferred that RWis methyl or that the two RWradicals that bind to the same carbon atom preferably form a ring system with one another. In compounds of the 5 formula (2c), one of the linkers L2is preferably a bond or a linker selected from L-1 to L-13 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. In compounds of formula (2c), one of the linkers L2is particularly preferably selected from a bond or the linkers L-1, L-2 and L-3 which may be substituted by one or more radicals R7as described before or preferably described before 10 or hereinafter. Said one linker L2is preferably bonded to the carbazole containing moiety of the compounds of formula (2c). The further linkers L2within compounds of formula (2c) are preferably a bond. Alternatively, all the linkers L2within the compounds of formula (2c) are preferably a bond. In a preferred embodiment of compounds of formula (2c), W1is C(RW)2, where RWis 15 methyl or two RWradicals that bind to the same carbon atom form a ring system with one another and all linkers L2are a bond. In compounds of the formula (2d), L3is preferably a heteroaromatic ring system which has 9 to 30 ring atoms and may be substituted by one or more R7radicals. 20 Preferred compounds of the formulae (2) and (2d) are the compounds of the formulae (2d- 25 30 formula (2d-1), 35 P24-131 SC - 49 - 5 10 15 20 , 25 where the symbols and indices for these formulae are defined as follows: (R7)x, (R7)y, represent a monosubstitution, a disubstitution, a trisubstitution or the maximum permissible substitution with the radical R7, R18is the same or different at each instance and is a straight-chain alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 12 carbon atoms, where two 30 radicals R18together may form a monocyclic or polycyclic, aliphatic, aromatic or heteroaromatic ring system which may be substituted by one or more R7radicals, L6is a single bond or an aromatic ring system which has 6 to 40 ring atoms and may be substituted in each case by one or more R7radicals, where L2, Ar5and R7have a previously mentioned or a previously and subsequently 35 preferred definition. In compounds of the formulae (2d-1) to (2d-3), all X are preferably N. P24-131 SC - 50 - In compounds of the formulae (2d-1) to (2d-3), the linker L6is preferably a bond or a linker selected from L-1 to L-13 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. In compounds of the formulae (2d-1) to (2d-3), the linker L6is particularly preferably selected from L-1 to L7 5 and L-12, which may be substituted by one or more radicals R7as described before or preferably described before. In compounds of the formulae (2d-1) to (2d-3), the linker L6is particularly preferably a linker L-12, which may be substituted by one or more radicals R7as described before or preferably described before. In compounds of the formulae (2d-1) to (2d-3), the linker L2is at each occurrence 10 independently preferably a bond or a linker selected from L-1 to L-13 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. In compounds of the formulae (2d-1) to (2d-3), all the linkers L2are particularly preferably a bond. 15 In compounds of the formulae (2d-1), (2d-2) and (2d-3), the radicals R7in (R7)x, and (R7)y are preferably as indicated below when they occur, and are most preferably D. In a preferred embodiment of the compounds of formula (2), said compounds correspond to one of the formulae (2a-1), (2a-2), (2a-4), (2b), (2b-1), (2c), (2d-1) and (3) as described 20 before or preferably described before. In a particularly preferred embodiment, the compound of formula (2) corresponds to a compound of formulae (2a-2), and (2d-1). In compounds of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2) and (2d-3), Ar5is at each occurrence independently 25 preferably a group of Ar5-1 to Ar5-21, 30 35

[0002]

[0003] Ar5-20 Ar5-21 P24-131 SC - 52 - where the symbols and indices used are as follows: Y3is O, S, NAr4or C(R5)2, the dashed bond is the bond to the rest of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2) and (2d-3); 5 R5is methyl or phenyl which may be partially or fully deuterated or two R5are bonded to form a spirobifluorenyl which may be partiylly or fully deuterated; Ar means phenylene which may be partially or fully deuterated; m is 0 or 1 and Ar4is phenyl, biphenyl or terphenyl which may be partially or fully deuterated and R8has a 10 meaning as described or preferably described herein. In Ar5-1 to Ar5-21, R8is preferably H, D, or non-deuterated, partially or fully deuterated phenyl; In Y3, the radical R5is preferably methyl. 15 In Ar5-16 to Ar5-19, Y3is preferably O or NAr4. In Ar5-16 to Ar5-19, m is preferably 0. In Ar5-1 to Ar5-21, R8is preferably H or D. 20 In a preferred embodiment of the compounds of the formulae (2), (2a), (2a-1), (2a-2), (2a- 3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), and (2d-3) that can be combined in accordance with the invention with above-detailed compounds of host material 1, as described above, R7is the same or different at each instance and is selected from the group consisting of D, F, CN, a straight-chain alkyl group having 1 to 20 25 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, or an aromatic heteroaromatic ring system which has 5 to 40 ring atoms, and which may be partially or completely deuterated in each case. In a particularly preferred embodiment of the compounds of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), and (2d- 30 3) that can be combined in accordance with above-detailed compounds of host material 1, as described above, R7is the same or different at each instance and is selected from the group consisting of D or an aromatic or heteroaromatic ring system which has 6 to 30 ring atoms and which may be partially or completely deuterated in each case, or is preferably D. 35 The preparation of the compounds of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), and (2d-3) is generally known, and some of the compounds are commercially available. P24-131 SC - 53 - Preferred compounds of formula (3) as host material 2 to be used according to the invention are compounds of formula (3a), 5 , where the symbols and indices used are as follows: 10 Y is the same or different at each instance and is N or CR9, with exclusion of the possibility that two Y alongside one another are both N; V2is O or S; R6at each instance is the same or different and is D, F, CN, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 15 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R7radicals and where one or more nonadjacent CH2groups may be replaced by Si(R7)2, C=O, NR7, O, S or CONR7, or an aromatic or heteroaromatic ring system which has 5 to 60 ring atoms and 20 which may be partially or completely deuterated in each case; it is also possible here for two R6radicals together to form an aromatic, heteroaromatic, aliphatic, or heteroaliphatic ring system; R7is the same or different at each instance and is D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, 25 OSO2R8, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R8radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, 30 O, S or CONR8, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and which may be partially or completely deuterated in each case; at the same time, two or more R7radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; R8is the same or different at each instance and is H, D, F or an aliphatic, 35 aromatic or heteroaromatic organic radical, especially a hydrocarbyl radical, having 1 to 20 carbon atoms, in which one or more hydrogen atoms may also be replaced by F; P24-131 SC - 54 - R9is the same or different at each instance and is H, D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic 5 alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R6radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted in each case by one or more R610 radicals; at the same time, two or more R9radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; D is deuterium, and a4 is 0, 1 or 2. 15 Preferred compounds of the formulae (3) and (3a) are compounds where V2is O. In a preferred embodiment of compounds of the formulae (3) and (3a), two Y are N and two Y are independently CR9, where R9has a meaning as described before. In a preferred embodiment of compounds of the formulae (3) and (3a), two Y are N and 20 two Y are independently CR9, where R9is preferably selected from Ar5-1 to Ar5-21 as described before, where the symbols and indices Y3, R5, Ar, m, Ar4and R8have a meaning as described or preferably described herein. In a preferred embodiment of compounds of the formulae (3) and (3a), R9adjacent to L2is 25 preferably selected from Ar5-1 to Ar5-21 as described before where the symbols and indices Y3, R5, Ar, m, Ar4and R8have a meaning as described or preferably described herein. In a preferred embodiment of compounds of the formulae (3), two Y are N and two Y are independently CR9, where R9is preferably independently selected from Ar5-1 to Ar5-21 as 30 described before, where the symbols and indices Y3, R5, Ar, m, Ar4and R8have a meaning as described or preferably described herein and the radical R9adjacent to L2is 4H-Naphtho[1,2,3,4-def]carbazole which may be substituted in each case by one or more R6radicals. In this embodiment, R6is preferably D. In a preferred embodiment of compounds of the formulae (3a), two Y are N and two Y are 35 independently CR9, where R9is preferably independently selected from Ar5-1 to Ar5-21 as described before, where the symbols and indices Y3, R5, Ar, m, Ar4and R8have a meaning as described or preferably described herein and the radical R9adjacent to L2is a triazine which is substituted in each case by one or more R6radicals, L2is a bond and R6 P24-131 SC - 55 - is independently selected from Ar5-1 to Ar5-21 as described before or preferably described before in which R8is H or D. In a preferred embodiment of compounds of the formulae (3) and (3a), L2is preferably a 5 bond or selected from L-1 to L-13 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. In compounds of the formulae (3) and (3a), the linker L2is particularly preferably a bond or a linker L-1 to L-5 which may be substituted by one or more radicals R7as described before or preferably described before or hereinafter. 10 In a preferred embodiment of the compounds of the formulae (3) and (3a) that can be combined in accordance with the invention with above-detailed compounds of host material 1, as described above, R7is the same or different at each instance and is selected from the group consisting of D, F, CN, a straight-chain alkyl group having 1 to 20 15 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, or an aromatic heteroaromatic ring system which has 5 to 40 ring atoms, and which may be partially or completely deuterated in each case. In a particularly preferred embodiment of the compounds of the formulae (3) and (3a) that can be combined in accordance with above-detailed compounds of host material 1, as 20 described above, R7is the same or different at each instance and is selected from the group consisting of D or an aromatic or heteroaromatic ring system which has 6 to 30 ring atoms and which may be partially or completely deuterated in each case. In a particularly preferred embodiment of the compounds of the formulae (3) and (3a) that can be combined in accordance with above-detailed compounds of host material 1, as 25 described above, R6is preferably D. The preparation of the compounds of the formulae (3), and (3a) is generally known, and some of the compounds are commercially available. 30 In a preferred embodiment of the light-emitting device or mixture according to the invention, host material 2 is partially or fully deuterated. If host material 2 is a deuterated compound, it is possible that this at least one matrix material is a mixture of deuterated compounds of the same basic chemical structure, 35 which differ only in the degree of deuteration and / or the deuteration pattern. The remarks on deuterated mixtures and on the preparation of deuterated materials, as previously described for host material 1, apply here accordingly. P24-131 SC - 56 - In a preferred embodiment of the host material 2 as described before or preferably described before, the latter is a mixture of deuterated compounds of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) or (3a) as described above, wherein the average deuteration level of 5 these compounds is at least 10 mol% to 100 mol%, preferably 50 mol% to 95 mol%, more preferably 70 mol% to 90 mol%. For a combination with the compounds of host material 1 as described above or described as preferred, suitable compounds are in particular those of the formulae (2), (2a), (2a-1), 10 (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) and / or (3a), as described above or described as preferred, or corresponding compounds in the tables that follow that are covered by these formulae. Further examples of suitable host materials of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), 15 (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) or (3a) that can be combined in accordance with the invention with above-detailed compounds of host material 1, as described above, are the structures shown hereinafter in tables 3 and 4 below. 20 Table 3: 25 30 35

[0004]

[0005]

[0006]

[0007]

[0008] P24-131 SC - 80 - 5 10 15 20 25 Particularly suitable compounds of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), 30 (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) and / or (3a) that can be combined in accordance with the invention with above-detailed compounds of the invention, as described above, and are used in the electroluminescent device of the invention or in the mixture, are the compounds E1 to E75 in table 4. 35 P24-131 SC - 81 - Table 4: 5 10 15 20 25 30 35 P24-131 SC - 82 - 5 E13 E 10 15 E16 E 20 25 E19 E 30 E22 E 35 P24-131 SC - 83 - 5 E25 E 10 15 E28 E 20 25 E31 E 30 35 E34 E P24-131 SC - 84 - 5 E37 E 10 15 E40 E 20 E43 E 25 30 E46 E 35 E49 E P24-131 SC - 85 - 5 E52 E 10 15 E55 E 20 25 E58 E 30 35 E61 E P24-131 SC - 86 - P24-131 SC - 87 - 5 10 The compounds in Tables 3 and 4 are shown in part as fully deuterated compounds for the sake of simplification, whereby these are generally intended to denote compounds that have a degree of deuteration of at least 50 mol%. The degree of deuteration for said 15 fully deuterated compounds in Tables 3 and 4 is therefore between 50 mol% and 100 mol% or has a preferred deuteration degree as described herein. For partially deuterated compounds, a D atom means that the corresponding position in the molecule has a degree of deuteration of at least 40 mol%. 20 The aforementioned host materials 1 and the embodiments thereof that have been described as preferred may be combined in the device of the invention in any desired manner with the aforementioned matrix material / host materials, the matrix material / host materials of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) or (3a), and the embodiments thereof that 25 have been described as preferred from table 3 or the compounds E1 to E75 from table 4 or the compounds E76 to E83 as described below. This applies for the light-emitting device according to the invention as well as the mixture according to the invention. 30 Very particularly preferred mixtures of the compounds of the formulae (1), (1a), (1b), (1c), (1d) or (1e) with the host materials of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) or (3a) for the device of the invention are obtained by combination of the compounds H1 to H48 with the 35 compounds E1 to E75 or with compounds E76 to E83. The following table 5 shows preferred mixtures. The first mixture M1, for example, is a combination of compound H1 with E1. P24-131 SC - 88 - Table 5: 5 10 15 20 25 30 35 P24-131 SC - 89 - 5 10 15 20 25 30 35 P24-131 SC - 90 - 5 10 15 20 25 30 35 P24-131 SC - 91 - 5 10 15 20 25 30 35 P24-131 SC - 92 - 5 10 15 20 25 The concentration of the total of all host materials 1 as described above or described as preferred in the mixture of the invention or in the light-emitting layer of the device of the 30 invention is typically in the range from 10% by weight to 95% by weight, preferably in the range from 15% by weight to 90% by weight, more preferably in the range from 15% by weight to 80% by weight, even more preferably in the range from 20% by weight to 70% by weight, very especially preferably in the range from 40% by weight to 80% by weight and most preferably in the range from 50% by weight to 70% by weight, based on the 35 overall mixture or based on the overall composition of the light-emitting layer. The concentration of the total of all host materials 2 as described above or described as preferred in the mixture of the invention or in the light-emitting layer of the device of the invention is typically in the range from 5% by weight to 90% by weight, preferably in the P24-131 SC - 93 - range from 10% by weight to 85% by weight, more preferably in the range from 20% by weight to 85% by weight, even more preferably in the range from 30% by weight to 80% by weight, very especially preferably in the range from 20% by weight to 60% by weight and most preferably in the range from 30% by weight to 50% by weight, based on the 5 overall mixture or based on the overall composition of the light-emitting layer. The present invention also relates to a mixture comprising at least one compound of the formula (1) and at least one compound of the formulae (2) or (3) as described before or preferably described before which comprises at least one further compound selected from 10 the group of matrix materials, phosphorescent emitters, fluorescent emitters and / or emitters having thermally activated delayed fluorescence. The present invention therefore relates to a mixture comprising at least one compound of the formula (1), one compound of the formula (2) and one compound of the formula (3), where the compounds of the formulae (1), (2) and (3) have a meaning as described or 15 preferably described before. The present invention therefore relates to a mixture comprising at least one compound of the formula (1), and two compounds of the formula (2) where the compounds of the formulae (1), and (2) have a meaning as described or preferably described before and where the two compounds of the formula (2) are different. 20 The present invention also relates to a mixture comprising at least one compound of the formula (1) and at least one compound of the formulae (2) and / or (3) as described before or preferably described before which comprises at least one further compound selected from the group of matrix materials, phosphorescent emitters, fluorescent emitters and / or emitters having thermally activated delayed fluorescence. 25 In a preferred embodiment of the mixture comprising three host materials as described before, the three host materials are selected from a compound of formula (1) or a preferred embodiment thereof as host material 1, a compound of formula (2d-1) or a preferred embodiment thereof as host material 2, and a compound of formula (3a) or a 30 preferred embodiment thereof as host material 3. In a preferred embodiment of the mixture comprising three host materials as described before, the three host materials are selected from a compound of formula (1) or a preferred embodiment thereof as host material 1, a compound of formula (2a-2) or a preferred embodiment thereof as host material 2, and a compound of formula (2b) or a 35 preferred embodiment thereof as host material 3. In a preferred embodiment of the mixture comprising three host materials as described before, the three host materials are selected from a compound of formula (1) or a preferred embodiment thereof as host material 1, a compound of formula (2a-2) or a P24-131 SC - 94 - preferred embodiment thereof as host material 2, and a compound of formula (2d-1) or a preferred embodiment thereof as host material 3. In a preferred embodiment of the mixture comprising three host materials as described before, the three host materials are selected from a compound of formula (1) or a 5 preferred embodiment thereof as host material 1, a compound of formula (2a-2) or a preferred embodiment thereof as host material 2, and a compound of formula (2a-4) or a preferred embodiment thereof as host material 3. In a preferred embodiment of the mixture comprising three host materials as described before, the three host materials are selected from a compound of formula (1) or a 10 preferred embodiment thereof as host material 1, a compound of formula (2a-4) or a preferred embodiment thereof as host material 2, and a compound of formula (2b) or a preferred embodiment thereof as host material 3. In a preferred embodiment of the mixture comprising three host materials as described before, the three host materials are selected from a compound of formula (1) or a 15 preferred embodiment thereof as host material 1, a compound of formula (2b) or a preferred embodiment thereof as host material 2, and a compound of formula (2d-1) or a preferred embodiment thereof as host material 3. The present invention also relates to a mixture comprising at least one compound of the 20 formula (1) and at least one compound of the formulae (2) and / or (3) as described before or preferably described before which comprises at least one phosphorescent emitter. The present invention also relates to a mixture consisting of at least one compound of the formula (1) and at least one compound of the formulae (2) and / or (3) as described before 25 or preferably described before and one further compound selected from the group of matrix materials, phosphorescent emitters, fluorescent emitters and / or emitters having thermally activated delayed fluorescence and a phosphorescent emitter. The present invention also relates to a mixture consisting of at least one compound of the 30 formula (1) and at least one compound of the formulae (2) and / or (3) as described before or preferably described before and a phosphorescent emitter. The term “phosphorescent emitters” typically encompasses compounds where the light is emitted through a spin-forbidden transition from an excited state having higher spin 35 multiplicity, i.e. a spin state > 1, for example through a transition from a triplet state or a state having an even higher spin quantum number, for example a quintet state. This is preferably understood to mean a transition from a triplet state. P24-131 SC - 95 - Suitable phosphorescent emitters (= triplet emitters) are especially compounds which, when suitably excited, emit light, preferably in the visible region, and also contain at least one atom of atomic number greater than 20, preferably greater than 38 and less than 84, more preferably greater than 56 and less than 80, especially a metal having this atomic 5 number. Preferred phosphorescence emitters used are compounds containing copper, molybdenum, tungsten, rhenium, ruthenium, osmium, rhodium, iridium, palladium, platinum, silver, gold or europium, especially compounds containing iridium or platinum. In the context of the present invention, all luminescent compounds containing the abovementioned metals are regarded as phosphorescent emitters. 10 In general, all phosphorescent complexes as used for phosphorescent OLEDs according to the prior art and as known to those skilled in the art in the field of organic electroluminescent devices are suitable. 15 Preferred phosphorescent emitters according to the present invention conform to the 20 25 30 , 35 P24-131 SC - 96 - 5 10 15 20 25 where the symbols and indices for these formulae (I), (II), (III), (IV) and (V) are defined as 30 follows: R1 is H or D, R2 is H, D, F, CN or a branched or linear alkyl group having 1 to 10 carbon atoms or a partly or fully deuterated branched or linear alkyl group having 1 to 10 carbon atoms or a cycloalkyl group which has 4 to 10 carbon atoms and may be partly or fully substituted by deuterium. 35 Preferred phosphorescent emitters according to the present invention conform to the formula (VI) P24-131 SC - 97 - 5 where the symbols and indices for this formula (VI) are defined as follows: 10 n+m is 3, n is 1 or 2, m is 2 or 1, X is the same or different at each instance and is N or CR, R is the same or different at each instance and is H, D, F, CN or a branched or linear alkyl group having 1 to 10 carbon atoms or a partly or fully deuterated, branched or linear alkyl group having 1 to 10 carbon atoms or a cycloalkyl group having 4 to 7 carbon atoms, 15 which may be partly or fully substituted by deuterium, or an aromatic heteroaromatic ring system which has 5 to 60 ring atoms and may be partly or fully substituted by deuterium. In emitters of the formula (VI), n is preferably 1 and m is preferably 2. In emitters of the formula (VI), preferably, one X is selected from N and the other X are 20 CR, or all X are the same or different at each instance and are CR. In emitters of the formula (VI), at least one R is preferably different from H. In emitters of the formula (VI), preferably two R are different from H and have one of the other definitions given above for the emitters of the formula (VI). 25 The invention accordingly further provides an organic electroluminescent device as described above or described as preferred, characterized in that the light-emitting layer, as well as the host materials 1 and 2, comprises at least one phosphorescent emitter conforming to one of the formulae (I), (II), (III), (IV), (V) or (VI) as described above, preferably conforming to formula (VI). 30 Preferred examples of phosphorescent emitters are described in WO2019 / 007867 on pages 120 to 126 in table 5, and on pages 127 to 129 in table 6. The emitters are incorporated into description by this reference. Particularly preferred examples of phosphorescent emitters are listed in table 6 below. 35 P24-131 SC - 98 - Table 6: 5 10 15 20 25 30 35 P24-131 SC - 100 - 5 10 15 20 25 In the mixtures of the invention or in the light-emitting layer of the device of the invention, any mixture as described preferably a combination of H1 to H48 with E1 to E75 or with E76 to E83, particularly selected from M1 to M600 is preferably combined with a compound of the formulae (I) to (VI) or a compound from table 6. 30 The light-emitting layer in the organic electroluminescent device of the invention, comprising at least one phosphorescent emitter, is preferably an infrared-emitting or yellow-, orange-, red-, green-, blue- or ultraviolet-emitting layer, more preferably a yellow- or green-emitting layer and most preferably a green-emitting layer. 35 A yellow-emitting layer is understood here to mean a layer having a photoluminescence maximum within the range from 540 to 570 nm. An orange-emitting layer is understood to mean a layer having a photoluminescence maximum within the range from 570 to 600 nm. A red-emitting layer is understood to mean a layer having a photoluminescence maximum P24-131 SC - 101 - within the range from 600 to 750 nm. A green-emitting layer is understood to mean a layer having a photoluminescence maximum within the range from 490 to 540 nm. A blue- emitting layer is understood to mean a layer having a photoluminescence maximum within the range from 440 to 490 nm. The photoluminescence maximum of the layer is 5 determined here by measuring the photoluminescence spectrum of the layer having a layer thickness of 50 nm at room temperature, where the layer comprises the inventive combination of the host material 1 of the formulae (1), (1a), (1b), (1c), (1d) or (1e) and of the host material 2 consisting of at least one of the formulae (2), (2a), (2a-1), (2a-2), (2a- 3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) or (3a), 10 and the corresponding emitter. The photoluminescence spectrum of the layer is recorded, for example, with a commercial photoluminescence spectrometer. 15 The photoluminescence spectrum of the emitter chosen is generally measured in oxygen- free solution, 10-5molar, at room temperature, a suitable solvent being any in which the chosen emitter dissolves in the concentration mentioned. Particularly suitable solvents are typically toluene or 2-methyl-THF, but also dichloromethane. Measurement is effected with a commercial photoluminescence spectrometer. The triplet energy T1 in eV is 20 determined from the photoluminescence spectra of the emitters. First the peak maximum Plmax. (in nm) of the photoluminescence spectrum is determined. The peak maximum Plmax. (in nm) is then converted to eV by: E(T1 in eV) = 1240 / E(T1 in nm) = 1240 / PLmax. (in nm). 25 Preferred phosphorescent emitters are accordingly yellow emitters, preferably of the formulae (I) to (VI) or from table 6, the triplet energy T1 of which is preferably ~2.3 eV to ~2.1 eV. Preferred phosphorescent emitters are accordingly green emitters, preferably of the 30 formulae (I) to (VI) or from table 6, the triplet energy T1 of which is preferably ~2.5 eV to ~2.3 eV. Particularly preferred phosphorescent emitters are accordingly green emitters, preferably of the formulae (I) to (VI) or from table 6 as described above, the triplet energy T1 of which 35 is preferably ~2.5 eV to ~2.3 eV. Most preferably, green emitters, preferably of the formulae (I) to (VI) or from table 6, as described above, are selected for the mixture of the invention or emitting layer of the invention. P24-131 SC - 102 - It is also possible for fluorescent emitters to be present in the light-emitting layer of the device of the invention or in the mixture of the invention. Preferred fluorescent emitting compounds are selected from the class of the arylamines, 5 where preferably at least one of the aromatic or heteroaromatic ring systems of the arylamine is a fused ring system, more preferably having at least 14 ring atoms. Preferred examples of these are aromatic anthraceneamines, aromatic anthracenediamines, aromatic pyreneamines, aromatic pyrenediamines, aromatic chryseneamines or aromatic chrysenediamines. An aromatic anthraceneamine is understood to mean a compound in 10 which a diarylamino group is bonded directly to an anthracene group, preferably in the 9 position. An aromatic anthracenediamine is understood to mean a compound in which two diarylamino groups are bonded directly to an anthracene group, preferably in the 9,10 positions. Aromatic pyreneamines, pyrenediamines, chryseneamines and chrysenediamines are defined analogously, where the diarylamino groups are bonded to 15 the pyrene preferably in the 1 position or 1,6 positions. Further preferred emitting compounds are indenofluoreneamines or -diamines, benzoindenofluoreneamines or - diamines, and dibenzoindenofluoreneamines or -diamines, and indenofluorene derivatives having fused aryl groups. Likewise preferred are pyrenearylamines. Likewise preferred are benzoindenofluoreneamines, benzofluoreneamines, extended benzoindenofluorenes, 20 phenoxazines, and fluorene derivatives joined to furan units or to thiophene units. The light-emitting device or the mixture of the invention may additionally also comprise materials that exhibit TADF (thermally activated delayed fluorescence). In a further preferred embodiment of the invention, the at least one light-emitting layer of 25 the organic electroluminescent device may have three or four different matrix materials, preferably three different matrix materials. These corresponding mixed matrix systems may consist of the matrix materials described for the host material 1 and the host material 2, but they may also comprise, as a third or fourth matrix material, for example alongside a host material 1 or host material 2, wide-band-gap materials, bipolar host materials, 30 electron transport materials (ETM) or hole transport materials (HTM). Preferably, the mixed matrix system is optimized for an emitter of the formulae (I) to (VI), or for an emitter from table 6. A wide-band gap material is understood herein to mean a material within the scope of the 35 disclosure of US 7,294,849 which is characterized by a band gap of at least 3.5 eV, the band gap being understood to mean the gap between the HOMO and LUMO energy of a material. P24-131 SC - 103 - In one embodiment of the present invention, the mixture, aside from the constituents of the host material 1 and the host material 2 as described above or described with preference, does not comprise any further constituents, i.e. functional materials. These are material mixtures that are used as such for production of the light-emitting layer. 5 These mixtures are also referred to as premix systems that are used as the sole material source in the vapor deposition of the host materials for the light-emitting layer and have a constant mixing ratio in the vapor deposition. In this way, it is possible in a simple and rapid manner to achieve the vapor deposition of a layer with homogeneous distribution of the components without the need for precise actuation of a multitude of material sources. 10 In an alternative embodiment of the present invention, the mixture, aside from the constituents of the host material 1 and the host material 2, as described above or described with preference, also comprises a phosphorescent emitter, as described above. In the case of a suitable mixing ratio in the vapor deposition, this mixture may also be 15 used as the sole material source. Preference is given to premix systems consisting of two matrix materials, namely one compound of the formulae (1), (1a), (1b), (1c), (1d) or (1e) and one compound of one of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), 20 (2c), (2d), (2d-1), (2d-2), (2d-3), (3) or (3a). Preference is given to premix systems consisting of three matrix materials, namely one compound of the formulae (1), (1a), (1b), (1c), (1d) or (1e) and two compounds of one of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), (3) or (3a). 25 The components or constituents of the light-emitting layer of the device of the invention may thus be processed by vapor deposition or from solution. The material combination of host materials 1 and 2, as described above or described as preferred, optionally with the phosphorescent emitter, as described above or described as preferred, are provided for 30 that purpose in a formulation containing at least one solvent. Suitable formulations have been described above. The light-emitting layer in the device of the invention, according to the preferred embodiments and the emitting compound, contains preferably between 99.9% and 1% by 35 volume, further preferably between 99% and 10% by volume, especially preferably between 98% and 60% by volume, very especially preferably between 97% and 80% by volume, of matrix material composed of at least one compound of the formulae (1), (1a), (1b), (1c), (1d) or (1e) and at least one compound of one of the formulae (2), (2a), (2a-1), (2a-2), (2a-3), (2a-4), (2a-5), (2a-6), (2a-7), (2b), (2b-1), (2c), (2d), (2d-1), (2d-2), (2d-3), P24-131 SC - 104 - (3) or (3a) according to the preferred embodiments, based on the overall composition of emitter and matrix material. Correspondingly, the light-emitting layer in the device of the invention preferably contains between 0.1% and 99% by volume, further preferably between 1% and 90% by volume, more preferably between 2% and 40% by volume, most 5 preferably between 3% and 20% by volume, of the emitter based on the overall composition of the light-emitting layer composed of emitter and matrix material. If the compounds are processed from solution, preference is given to using the corresponding amounts in % by weight rather than the above-specified amounts in % by volume. 10 The present invention also relates to an organic electroluminescent device as described above or described as preferred, wherein the organic layer comprises a hole injection layer (HIL) and / or a hole transport layer (HTL) and / or an electron blocking layer (EBL), the hole-injecting material and / or hole-transporting material and / or electron blocking layer of which belongs to the class of monoamines or diamines that do not contain a carbazole 15 unit. The hole-injecting material and / or hole-transporting material and / or electron blocking material particularly preferably comprises a monoamine or diamine containing a fluorenyl or bispirofluorenyl group, but no carbazole unit. The hole-injecting material and / or hole- transporting material and / or electron blocking material particularly preferably comprises a monoamine containing a fluorenyl or bispirofluorenyl group, but no carbazole unit. 20 Preferred hole-injecting materials and / or hole-transporting materials and / or electron blocking materials which are used in accordance with the invention in the organic layer of 25 30 35 P24-131 SC - 105 - 5 10 where the following applies to the symbols and indices occurring within formulae (I-A) and (I-B): 15 Ar10, Ar11, Ar12are on each occurrence, identically or differently, an aromatic ring system having 6 to 40 aromatic ring atoms or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R12, where two or more radicals Ar10, Ar11, Ar12may form an aliphatic, aromatic or heteroaromatic ring system together, which may be substituted by one or more radicals R12; 20 L12is on each occurrence, identically or differently, a single bond, an aromatic having 6 to 30 aromatic ring atoms or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R13; 25 k12 is an integer selected from 1 to 3; E is the same or different at each instance and are selected from a single bond, Si(R12)2, O, S, NR12, and C(R12)2; 30 i10, i11, i12 are on each occurrence, identically or differently, 0 or 1; T21, T22are the same or different at each instance and are selected from a single bond, O, S, NR21, and C(R21)2; 35 R12, R13, R20a, R20b, R20c, R20d, R21stand on each occurrence, identically or differ- ently, for H, D, F, Cl, Br, I, CHO, CN, N(R19)2, C(=O)Ar, P(=O)(Ar)2, S(=O)Ar, S(=O)2Ar, NO2, Si(R19)3, B(OR19)2, OSO2R19, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 40 C atoms or branched or a cyclic alkyl, alkoxy or thioalkyl group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R19, where in each case P24-131 SC - 106 - one or more non-adjacent CH2 groups may be replaced by R19C=CR19, C≡C, Si(R19)2, Ge(R19)2, Sn(R19)2, C=O, C=S, C=Se, P(=O)(R19), SO, SO2, O or S and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic ring system having 6 to 40 aromatic ring atoms or heteroaromatic ring system having 5 to 40 aromatic 5 ring atoms, which may in each case be substituted by one or more radicals R19; two or more radicals R12, two or more radicals R13, two or more radicals R20a, two or more radicals R20b, two or more radicals R20c, two or more radicals R20dor two or more radicals R21may form an aliphatic, aromatic or heteroaromatic ring system together, which may be substituted by one or more radicals R19; 10 R19stands on each occurrence, identically or differently, for H, D, F, Cl, Br, I, CHO, CN, N(R’)2, C(=O)Ar, P(=O)(Ar)2, S(=O)Ar, S(=O)2Ar, NO2, Si(R´)3, B(OR´)2, OSO2R´, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 40 C atoms or branched or a cyclic alkyl, alkoxy or thioalkyl group having 3 to 40 C atoms, each of which may be 15 substituted by one or more radicals R´, where in each case one or more non-adjacent CH2 groups may be replaced by R´C=CR´, C≡C, Si(R´)2, Ge(R´)2, Sn(R´)2, C=O, C=S, C=Se, P(=O)(R´), SO, SO2, O or S and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic ring system having 6 to 40 aromatic ring atoms or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may in each case 20 be substituted by one or more radicals R´; where two radicals R19may form an aliphatic, aromatic or heteroaromatic ring system together, which may be substituted by one or more radicals R´; Z11and Z21stand on each occurrence, identically or differently, for a group represented by 25 formula A 30 Formula A where R90stands on each occurrence, identically or differently, for a straight-chain alkyl having 1 to 40 C atoms or branched or a cyclic alkyl having 3 to 40 C atoms, each of which may be substituted by one or more radicals R’, where in each case one or more non-adjac’ ’35 ent CH2 groups may be replaced by RC=CR or C≡C, and where one or more H atoms may be replaced by D, an aromatic ring system having 6 to 40 aromatic ring atoms or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may in each case be substituted by one or more radicals R’, preferably, P24-131 SC - 107 - R90stands on each occurrence, identically or differently, for a straight-chain alkyl having 1 to 40 C atoms or branched or a cyclic alkyl having 3 to 40 C atoms, each of which may be substituted by one or more radicals R’, where in each case one or more non-adjacent CH2 groups may be replaced by R’C=CR’or C≡C, and where one or more H atoms may 5 be replaced by D, more preferably, R90stands on each occurrence, identically or differ- ently, for a straight-chain alkyl having 1 to 40 C atoms or branched alkyl having 3 to 40 C atoms, each of which may be substituted by one or more radicals R’, where in each case one or more non-adjacent CH2 groups may be replaced by R’C=CR’or C≡C, and where one or more H atoms may be replaced by D; 10 L90is a single bond, an aromatic having 6 to 30 aromatic ring atoms or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R’, preferably L90is a single bond or an aromatic having 6 to 30 aromatic ring atoms, which may be substituted by one or more radicals R’, more preferably, L90is a 15 single bond; t10 is an integer selected from 0 to 10; t20 is an integer selected from 0 to 10; 20 * is a binding site with the rest of the formula (I-A) or (I-B); Ar is, on each occurrence, identically or differently, an aromatic ring system having 6 to 40 aromatic ring atoms or heteroaromatic ring system having 5 to 40 aromatic ring atoms, 25 which may in each case also be substituted by one or more radicals R´; R´stands on each occurrence, identically or differently, for H, D, F, Cl, Br, I, CN, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms or branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms, where in each case one or more 30 non-adjacent CH2 groups may be replaced by SO, SO2, O, S and where one or more H atoms may be replaced by D, F, Cl, Br or I, aryl or heteroaryl amine group having 6 to 24 ring atoms, or an aromatic ring system having 6 to 24 aromatic ring atoms or heteroaromatic ring system having 5 to 24 aromatic ring atoms; and 35 m21, m22, m23 and m24 are on each occurrence, identically or differently, 0, 1, 2, 3 or 4; and with the condition that a compound of the formula (I-A) or of the formula (I-B) do not contain a carbazole unit. A preferred compound of formula (I-A) is represented by formula (I-A-1), P24-131 SC - 108 - 5 formula (I-A-1), where Ar12, L12, k12, Ar10, Ar11, Z11and t10 have a meaning as described above, with the condition that a compound of the formula (I-A-1) does not contain a carbazole unit. 10 In compounds of formula (I-A) or (I-A-1), Ar12is preferably selected from the groups Ar12-1 15 20 25 30 35 , P24-131 SC - 109 - 5 10 15 where R12and * have a meaning as described before, Z and Z1are at each occurrence independently N or C with the condition that two adjacent Z or two adjacent Z1are not 20 both N, ESis S or O, preferably O, a is 1, 2 or 3, b is 1, 2, 3 or 4, c is 1, 2, 3 or 4, d is 1, 2, 3 or 4 and e is 1, 2, 3, 4 or 5. In preferred compounds of formula (I-A) and (I-A-1), t10 is 0 and Z11does not occur. In a preferred embodiment, Ar12-3 is selected from Ar12-3-1 or Ar12-3-2, 25 30 35 P24-131 SC - 110 - 5 10 In a preferred embodiment, Ar12-4 is selected from Ar12-4-1 or Ar12-4-2, 15 20 25 where R12, a, b, Z1and * have a meaning as described before, where Z1is preferably C. In a preferred embodiment compounds of formulae (I-A) or (I-A-1) are selected from compounds of formulae (I-A-2) to (I-A-5), which may be partially or fully deuterated, 30 35 formula (I-A-2) formula (I-A-3) P24-131 SC - 111 - 5 formula (I-A-4) formula (I-A-5), 10 where L12 in formulae (I-A-2) to (I-A-5) is an aromatic ring system having 6 to 30 aromatic ring atoms or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R13, where R13, Ar10and Ar11have a meaning as described before or as preferably described below and R12has at each occurrence independently a meaning as described before but excluding H and R12*is at each 15 occurrence independently a straight-chain or branched alkyl group having 1 to 10 carbon atoms or phenyl where both alkyl and aryl may be substituted by one or more D atoms, with the condition that a compound of the formulae (I-A-2) to (I-A-5) does not contain a carbazole unit. 20 In compounds of the formulae (I-A), (I-A-1), (I-A-2) to (I-A-5), the linker L12is preferably, identically or differently, a single bond or is selected from the group consisting of benzene, biphenyl, terphenyl, naphthyl, fluorenyl, indenofluorenyl, spirobifluorenyl, dibenzofuranyl and dibenzothiophenyl, which may each be substituted by one or more radicals R13. More preferably, L12is, identically or differently, a single bond or are selected from the group 25 consisting of benzene, biphenyl, terphenyl, naphthyl, dibenzofuranyl and dibenzothiophenyl, which may be substituted by one or more radicals R13. Even more preferably, L12stands for a single bond, benzene or biphenyl, which may be substituted by one or more radicals R13. R13is preferably D. 30 In compounds of the formulae (I-A-2) to (I-A-5), R12*is preferably methyl or phenyl which may be substituted by one or more D atoms. In compounds of the formulae (I-A-2) to (I-A-5), R12is preferably independently a straight- chain or branched alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms or an arylalkyl group having 6 to 30 carbon atoms where said alkyl, aryl and 35 arylalkyl groups may be substituted by one or more D atoms. In compounds of the formulae (I-A-2) to (I-A-5), R12is preferably independently tert-butyl, phenyl or phenyl substituted with tert.-butyl where these groups may be partially or fully deuterated. P24-131 SC - 112 - In a preferred embodiment of Ar12-5, a is 0, e is 1 or 2 and R12is preferably independently tert-butyl, phenyl or phenyl substituted with tert.-butyl where these groups may be partially or fully deuterated. 5 In a preferred embodiment of Ar12-3, Ar12-3-1, Ar12-3-2, a is 1, b is 1, c is 1, d is 1 and R12is preferably independently tert-butyl, phenyl or phenyl substituted with tert.-butyl where these groups may be partially or fully deuterated. 10 In one embodiment of the compounds of the formulae (I-A), (I-A-1), (I-A-2), (I-A-3), (I-A-4) 15 is preferably selected from the groups of formulae (A-1) to (A-39), which may be partially or fully 20 25 30 35 P24-131 SC - 113 - 5 A-5 10 15 A-7 20 25 A-9 30 35 A-11 A-12 P24-131 SC - 114 - 5 A-13 10 N 4 R 4 R 15 A-15 20 25 A-17 N 30 A-19 35 P24-131 SC - 115 - 5 A-21 10 15 A-23 20 A-25 25 30 A-27 35 P24-131 SC - 116 - 5 A-29 10 15 A-31 20 25 A-33 30 A-35 35 P24-131 SC - 117 - 5 10 A-39, 15 where the dotted line represents the remainder of formulae (I-A), (I-A-1), (I-A-2), (I-A-3), (I- A-4) and (I-A-5), and where R4is at each occurrence independently a straight-chain or branched alkyl group or phenyl where both alkyl and aryl may be substituted by one or more D atoms or the two substituents R4may form an aliphatic, aromatic or 20 heteroaromatic ring system together, which may be substituted by one or more D atoms. In preferred compounds of formula (I-B), t20 is 0 and Z21does not occur. A preferred compound of the formula (I-B) is represented by formula (I-B-1), 25 30 e a meaning as described 35 before, with the condition that a compound of the formulae (I-B-1) does not contain a carbazole unit. It is preferable tha a compound of the formula (I-B) has one or two substituents R20a, R20b, R20cor R20dwhich are different from H or D and which may be preferably selected independently from a straight-chain or branched alkyl group, an aryl P24-131 SC - 118 - group having 6 to 18 carbon atoms or an arylalkyl group having 6 to 30 carbon atoms where said alkyl, aryl and arylalkyl groups may be substituted by one or more D atoms. In a preferred embodiment of compounds of the formula (I-B-1), R21is at each occurrence 5 independently an aryl group having 6 to 40 carbon atoms which may be substituted by one or more D atoms. In compounds of the formulae (I-A), (I-A-1), (I-A-2) to (I-A-5), (I-B) and (I-B-1), the symbols Ar10, Ar11and R21are on each occurrence, identically or differently, preferably selected 10 from the group consisting of phenyl, biphenyl, terphenyl, quaterphenyl, naphthyl, fluorenyl, especially 9,9'-dimethylfluorenyl and 9,9'-diphenylfluorenyl, benzofluorenyl, spirobifluorenyl, indenofluorenyl, dibenzofuranyl, dibenzothiophenyl, benzofuranyl, and benzothiophenyl, and combinations of two or three of these groups, which are each optionally substituted by one or more radicals R12, where R12is preferably D. 15 In compounds of formulae (I-A), (I-A-1), (I-A-2) to (I-A-5), (I-B) and (I-B-1), the symbols Ar10, Ar11and R21are on each occurrence, identically or differently, particularly preferably selected from the group consisting of phenyl, biphenyl, terphenyl, quaterphenyl, naphthyl, 20 fluorenyl, especially 9,9'-dimethylfluorenyl and 9,9'-diphenylfluorenyl, benzofluorenyl, spirobifluorenyl, indenofluorenyl, dibenzofuranyl, dibenzothiophenyl, benzofuranyl, benzothiophenyl, benzofused dibenzofuranyl, benzofused dibenzothiophenyl, naphthyl- substituted phenyl, fluorenyl-substituted phenyl, spirobifluorenyl-substituted phenyl, dibenzofuranyl-substituted phenyl, dibenzothiophenyl-substituted phenyl, pyridyl- 25 substituted phenyl, pyrimidyl-substituted phenyl, and triazinyl-substituted phenyl, each of which may optionally be substituted by one or more radicals R12, where R12is preferably D. Preferred hole-injecting materials and / or hole-transporting materials and / or electron 30 blocking materials which are used in accordance with the invention in the organic layer of the device of the invention and which may be partially or fully deuterated are described in table 7. 35 P24-131 SC - 119 - Table 7: The following compounds may be partially or fully deuterated 5 10 15 20 25 30 35 P24-131 SC - 127 - 5 10 15 20 25 Processes for synthesis of compounds of the formulae (I-A) and (I-B) and their preferred embodiments as described before or of the compounds of table 7 are known in the prior art, especially in the publications cited in the table below: 30 35 P24-131 SC - 128 - 5 10 The sequence of layers in the organic electroluminescent device of the invention is 15 preferably as follows: anode / hole injection layer / hole transport layer / emitting layer / hole blocker layer / electron transport layer / electron injection layer / cathode. This sequence of the layers is a preferred sequence. 20 At the same time, it should be pointed out again that not all the layers mentioned need be present and / or that further layers may additionally be present. Materials used for the electron transport layer may be any materials as used according to the prior art as electron transport materials in the electron transport layer. Especially 25 suitable are aluminum complexes, for example Alq3, zirconium complexes, for example Zrq4, benzimidazole derivatives, triazine derivatives, pyrimidine derivatives, pyridine derivatives, pyrazine derivatives, quinoxaline derivatives, quinoline derivatives, oxadiazole derivatives, aromatic ketones, lactams, boranes, diazaphosphole derivatives and phosphine oxide derivatives. 30 Suitable cathodes of the device of the invention are metals having a low work function, metal alloys or multilayer structures composed of various metals, for example alkaline earth metals, alkali metals, main group metals or lanthanoids (e.g. Ca, Ba, Mg, Al, In, Yb, Sm, etc.). Additionally suitable are alloys composed of an alkali metal or alkaline earth 35 metal and silver, for example an alloy composed of magnesium and silver. In the case of multilayer structures, in addition to the metals mentioned, it is also possible to use further metals having a relatively high work function, for example Ag or Al, in which case combinations of the metals such as Ca / Ag, Mg / Ag or Ba / Ag, for example, are generally used. It may also be preferable to introduce a thin interlayer of a material having a high P24-131 SC - 129 - dielectric constant between a metallic cathode and the organic semiconductor. Examples of useful materials for this purpose are alkali metal or alkaline earth metal fluorides, but also the corresponding oxides or carbonates (e.g. LiF, Li2O, BaF2, MgO, NaF, CsF, Cs2CO3, etc.). It is also possible to use lithium quinolinate (LiQ) for this purpose. The layer 5 thickness of this layer is preferably between 0.5 and 5 nm. Preferred anodes are materials having a high work function. Preferably, the anode has a work function of greater than 4.5 eV versus vacuum. Firstly, metals having a high redox potential are suitable for this purpose, for example Ag, Pt or Au. Secondly, metal / metal 10 oxide electrodes (e.g. Al / Ni / NiOx, Al / PtOx) may also be preferred. For some applications, at least one of the electrodes has to be transparent or partly transparent in order to enable either the irradiation of the organic material (organic solar cell) or the emission of light (OLED, O-LASER). Preferred anode materials here are conductive mixed metal oxides. Particular preference is given to indium tin oxide (ITO) or indium zinc oxide (IZO). 15 Preference is further given to conductive doped organic materials, especially conductive doped polymers. In addition, the anode may also consist of two or more layers, for example of an inner layer of ITO and an outer layer of a metal oxide, preferably tungsten oxide, molybdenum oxide or vanadium oxide. 20 The organic electroluminescent device of the invention, in the course of production, is appropriately (according to the application) structured, contact-connected and finally sealed, since the lifetime of the devices of the invention is shortened in the presence of water and / or air. 25 The production of the device of the invention is not restricted here. It is possible that one or more organic layers, including the light-emitting layer, are coated by a sublimation method. In this case, the materials are applied by vapor deposition in vacuum sublimation systems at an initial pressure of less than 10-5mbar, preferably less than 10-6mbar. In this case, however, it is also possible that the initial pressure is even lower, for example 30 less than 10-7mbar. The organic electroluminescent device of the invention is preferably characterized in that one or more layers are coated by the OVPD (organic vapor phase deposition) method or with the aid of a carrier gas sublimation. In this case, the materials are applied at a 35 pressure between 10-5mbar and 1 bar. A special case of this method is the OVJP (organic vapor jet printing) method, in which the materials are applied directly by a nozzle and thus structured (for example M. S. Arnold et al., Appl. Phys. Lett.2008, 92, 053301). P24-131 SC - 130 - The organic electroluminescent device of the invention is further preferably characterized in that one or more organic layers comprising the composition of the invention are produced from solution, for example by spin-coating, or by any printing method, for example screen printing, flexographic printing, nozzle printing or offset printing, but more 5 preferably LITI (light-induced thermal imaging, thermal transfer printing) or inkjet printing. For this purpose, soluble host materials 1 and 2 and phosphorescent emitters are needed. Processing from solution has the advantage that, for example, the light-emitting layer can be applied in a very simple and inexpensive manner. This technique is especially suitable for the mass production of organic electroluminescent devices. 10 In addition, hybrid methods are possible, in which, for example, one or more layers are applied from solution and one or more further layers are applied by vapor deposition. These methods are known in general terms to those skilled in the art and can be applied 15 to organic electroluminescent devices. The invention therefore further provides a process for producing the organic electroluminescent device of the invention as described above or described as preferred, characterized in that the organic layer, preferably the light-emitting layer, the hole injection 20 layer and / or hole transport layer, is applied by gas phase deposition, especially by a sublimation method and / or by an OVPD (organic vapor phase deposition) method and / or with the aid of a carrier gas sublimation, or from solution, especially by spin-coating or by a printing method. 25 In the case of production by means of gas phase deposition, there are in principle two ways in which the organic layer, preferably the light-emitting layer, of the invention can be applied or vapor-deposited onto any substrate or the prior layer. Firstly, the materials used can each be initially charged in a material source and ultimately evaporated from the different material sources ("co-evaporation"). Secondly, the various materials can be 30 premixed (premix systems) and the mixture can be initially charged in a single material source from which it is ultimately evaporated ("premix evaporation"). In this way, it is possible in a simple and rapid manner to achieve the vapor deposition of the light-emitting layer with homogeneous distribution of the components without the need for precise actuation of a multitude of material sources. 35 The following methods are possible: A process for producing the organic electroluminescent device of the invention as described above or described as preferred, characterized in that the organic layer, preferably the light-emitting layer, the electron transport layer and / or hole blocker layer, is P24-131 SC - 131 - applied by gas phase deposition, especially by a sublimation method and / or by an OVPD (organic vapor phase deposition) method and / or with the aid of a carrier gas sublimation, or from solution, especially by spin-coating or by a printing method. 5 A process for producing the organic electroluminescent device of the invention, as described above or described as preferred, characterized in that the light-emitting layer of the organic layer is applied by gas phase deposition, wherein the at least host material 1 is deposited from the gas phase together with the host material 2 and further materials that form the light-emitting layer, successively or simultaneously from at least two material 10 sources. A process for producing the device of the invention, characterized in that the light-emitting layer of the organic layer is applied by gas phase deposition, wherein the at least one host material 1 and the at least one host material 2 is deposited from the gas phase together 15 as premix, successively or simultaneously with the light-emitting materials selected from the group of the phosphorescent emitters, fluorescent emitters and / or emitters that exhibit TADF (thermally activated delayed fluorescence). The electronic devices of the invention, especially organic electroluminescent devices, are 20 notable for one or more of the following surprising advantages over the prior art: 1. Organic light-emitting devices comprising compounds of formula (1) or the preferred embodiments recited above and at least one compound of formulae (2) and / or (3) or at least one of the preferred embodiments cited above have a very good lifetime. 25 2. Organic light-emitting devices comprising compounds of formula (1) or the preferred embodiments recited above and hereinafter and at least one compound of formulae (2) and / or (3) or at least one of the preferred embodiments cited above, have excellent efficiency. In this context, compounds of the invention having structures of 30 formula (1) or the preferred embodiments recited above and hereinafter bring about a low operating voltage when used in electronic devices. 3. Organic light-emitting devices comprising compounds of formula (1) or the preferred embodiments recited above and hereinafter and at least one compound of formulae 35 (2) and / or (3) or at least one of the preferred embodiments cited above, have a low capacitance. This is advantageous for achieving high switching times when used as an electroluminescent device in screens. P24-131 SC - 132 - These abovementioned advantages are not accompanied by an inordinately high deterioration in the further electronic properties. It should be pointed out that variations of the embodiments described in the present 5 invention are covered by the scope of this invention. Any feature disclosed in the present invention may, unless this is explicitly ruled out, be exchanged for alternative features which serve the same purpose or an equivalent or similar purpose. Any feature disclosed in the present invention, unless stated otherwise, should therefore be considered as an example from a generic series or as an equivalent or similar feature. 10 All features of the present invention may be combined with one another in any manner, unless particular features and / or steps are mutually exclusive. This is especially true of preferred features of the present invention. Equally, features of non-essential combinations may be used separately (and not in combination). 15 The technical teaching disclosed with the present invention may be abstracted and combined with other examples. The invention is illustrated in detail by the examples which follow, without any intention of restricting it thereby. 20 Examples Synthesis examples The syntheses which follow, unless stated otherwise, are conducted under a protective gas atmosphere in dried solvents. The compounds of the invention can be prepared by 25 means of synthesis methods known to those skilled in the art. 1) 5-([1,1'-biphenyl]-3-yl)-8-(triphenylen-1-yl)-5,8-dihydroindolo[2,3-c] carbazole 1a 30 35 25 g (61 mmol; 1.00 eq.) of 5-([1,1'-biphenyl]-3-yl)-5,8-dihydroindolo[2,3-c]carbazole, 20.6 g (67 mmol; 1.1 eq.) of 1-bromotriphenylene and 7.4 g (67 mmol; 1.10 eq.) of sodium tert-pentoxide in 200 ml of toluene is inertized in an argon stream for 30 minutes. Then P24-131 SC - 133 - 738 mg (1.8 mmol; 3 mol%) of dicyclohexyl-(2',6'-dimethoxybiphenyl-2-yl)phosphane (SPhos), 403 mg (1.8 mmol; 3 mol%) of palladium acetate are added and the mixture is heated to reflux for 18 hours. After completion of conversion and cooling to room temperature, 500 ml of water are added to the reaction. After separation of the phases 5 and extraction of the aqueous phase with toluene, the combined organic phases are concentrated and heptane is added. The precipitated solids are isolated. Purification by means of Soxhlet extraction, recrystallization and vacuum sublimation gives the desired product (23.2 g; 36.6 mmol; 60% of theory). 10 The following compounds can be obtained analogously with a yield between 40 and 80%: 15 20 25 30 35 P24-131 SC - 136 - 5 2) 5-([1,1'-biphenyl]-3-yl-d9)-8-(triphenylen-1-yl-d11)-5,8-dihydroindolo[2,3- 10 c]carbazole-1,2,3,4,6,7,9,10,11,12-d102a 15 20 10.0 g (15.7 mmol; 1.00 eq) of 5-([1,1'-biphenyl]-3-yl)-8-(triphenylen-1-yl)-5,8- dihydroindolo[2,3-c] carbazole and 20.0 g of Pt 5% on activated carbon are suspended in 400 g (502 mmol; 1.00 eq) of deuterium oxide and 200 g (778 mmol; 1.55 eq) of toluene- d8. The reaction mixture is stirred at 165°C and elevated autogenous pressure for 5 hours. Cooling is followed by two extractions with tetrahydrofuran and washing of the 25 combined organic phases with saline solution and drying over sodium sulfate. After filtration, the solvent is removed under reduced pressure. The product shown above (4.3 g, 6.82 mmol, 44% of theory) is obtained after further purification by extraction, recrystallization and sublimation. 30 The synthesis of further deuterated indolocarbazole derivatives can be carried out analogously with a yield between 40% and 85%: 35 P24-131 SC - 137 - Starting material 1 5 2b 10 2c 15 N 20 N 2d O 25 N 2eN30 2f 35 P24-131 SC - 138 - Production of the OLEDs Production of vapor processed OLED devices The use of the material combinations according to the invention in OLEDs is presented in the following examples Ex1 to Ex37 (see Tables 8 and 9). 5 Glass plaques coated with a structured ITO (indium tin oxide) anode of thickness 50 nm are treated with an oxygen plasma, followed by an argon plasma before coating. These plasma treated glass plaques form the substrates to which the OLEDs layers are applied. The OLEDs basically have the following layer structure: substrate / hole injection layer 10 (HIL) / hole transport layer (HTL) / electron blocking layer (EBL) / emission layer (EML) / hole blocking layer (HBL) / electron transport layer (ETL) / electron injection layer (EIL) and finally a cathode. For BE devices the cathode is formed by a thermal evaporation of a layer of aluminium with a total thickness of 100nm. 15 All materials are applied by thermal vapour deposition in a vacuum chamber. The emission layer here always consists of at least one matrix material and one emitting dopant, which is mixed with the matrix material or matrix materials in a certain proportion by volume by co-evaporation. An expression such as E3:H5:TEG2 (32%:60%:8%) here means that material E3 is present in the layer in a proportion by volume of 32%, material 20 H5 is present in the layer in a proportion by volume of 60%, and material TEG2 is present in the layer in a proportion by volume of 8%. Analogously, the electron-transport layer and hole-injection layer may also consist of a mixture of two or more materials. The detailed stack sequence with respect to the purely organic layers is shown in Table 8. 25 The materials used for the OLED fabrication are presented in Table 10, unless previously described. The OLED devices are characterized by standard methods. For this purpose, electroluminescence spectra and current-voltage-luminance (IVL) characteristics are 30 measured, from which the external quantum efficiency (EQE) is calculated. The calculation is performed assuming Lambertian emission characteristics. EQE10 and U10 denote the external quantum efficiency (EQE) and device driving voltage (U) measured at a current density of 10 mA / cm². 35 The lifetime LT is defined as the time in hours (h) after which the luminance drops from the starting luminance (L0) in cd / m² to a certain luminance L1 in cd / m² in the course of operation with constant current j0. A figure of L1 / L0=90% means that the lifetime reported in the LT column corresponds to the time after which the starting luminance (L0) falls to 90% of its starting value. P24-131 SC - 139 - For every example (Ex), a relative Voltage (Rel. U10), a relative EQE (Rel. EQE10) and a relative LT (Rel. LT) is calculated in comparison to the corresponding comparative example (V) by using the following formulae: Rel. U10 (Ex) = U10 (Ex) / U10 (V) 5 Rel. EQE10 (Ex) = EQE10 (Ex) / EQE10 (V) Rel. LT (Ex) = LT (Ex) / LT (V) The performance data of the OLEDs are summarized in Table 9. For every example, the corresponding comparative example is specified in Table 9. 10 Use of mixtures according to the invention in OLEDs The material combinations according to the invention can be used in the emission layer in phosphorescent green OLEDs. The inventive examples show an increased lifetime while the external quantum efficiency at a constant level. 15 Table 8: 20 25 30 35 P24-131 SC - 140 - 5 10 15 20 25 30 35 P24-131 SC - 141 - 5 10 15 20 25 30 35 P24-131 SC - 142 - Table 9: Data of the OLEDs 5 10 15 20 25 30 35 P24-131 SC - 143 - Table 10: Materials used, if not already described 5 10 15 20 25 30 35 P24-131 SC - 144 - 5 SpMA4 10 H35 15 20 H4 25 30 H39 35 E15 P24-131 SC - 145 - 5 E78 10 15 E57 20 25 E5 30 E80 35

Claims

1. P24-131 SC - 147 - Claims 1. Organic light-emitting device comprising an anode, a cathode and at least one organic layer containing at least one light-emitting layer, wherein the at least one light-emitting 5 layer contains at least one compound of the formula (1) as host material 1 and at least one compound of the formula (2) and / or of the formula (3) as host material 2, 10 15 20 25 30where the symbols and indices used are as follows: (R)a, (R)b, (R)c, stands on each occurrence identically or differently for a mono- 35 subsitution, a di-substitution, a tri-substitution, a maximum possible substitution with the substituent R, or for no-substitution; R stands for D, a straight or branched alkyl group having 1 to 10 carbon atoms, a heteroaryl group which has 5 to 30 ring atoms or an aryl group which has 6P24-131 SC - 148 - to 30 carbon atoms and both heteroaryl or aryl group may be substituted by one or more R# radicals; R# stands for D, F, CN, or non-deuterated, partially or fully deuterated phenyl;; L is a single bond or an aromatic divalent linker having 6 to 30 ring atoms and 5 may be substituted in each case by one or more R# radicals; Ar* is an aryl group having 12 to 24 carbon atoms or a heteroaryl group which has 10 to 40 ring atoms and both aryl or heteroaryl group may be substituted by one or more R# radicals; X stands on each occurrence, identically or differently, for N or CR6; 10 L2is the same or different at each instance and is a single bond or an aromatic or heteroaromatic ring system which has 5 to 24 ring atoms and may be substituted in each case by one or more R7radicals; R## is the same or different instance and is D, F, CN or an aromatic ring system which has 6 to 24 ring atoms and may be substituted by one or more R615 radicals, and two adjacent substituents R## together may form an aromatic, heteroaromatic, aliphatic, heteroaliphatic ring system that may be substituted by one or more R7radicals; Y is the same or different at each instance and is N or CR9, with exclusion of the possibility that two Y alongside one another are both N; 20 V2is O or S; R6at each instance is the same or different and is D, F, CN, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be 25 substituted by one or more R7radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R7)2, C=O, NR7, O, S or CONR7, or an aromatic or heteroaromatic ring system which has 5 to 60 ring atoms and which may be partially or completely deuterated in each case; it is also possible here for two R6radicals together to form an aromatic, heteroaromatic, 30 aliphatic, or heteroaliphatic ring system; Ar5is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted by one or more R7radicals; R7is the same or different at each instance and is D, F, Cl, Br, I, N(R8)2, CN, 35 NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R8radicals and whereP24-131 SC - 149 - one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and which may be partially or completely deuterated in each case; at the same time, two or more R7radicals together may form an 5 aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; R8is the same or different at each instance and is H, D, F or an aliphatic, aromatic or heteroaromatic organic radical, especially a hydrocarbyl radical, having 1 to 20 carbon atoms, in which one or more hydrogen atoms may also be replaced by F; 10 R9is the same or different at each instance and is H, D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl 15 group may in each case be substituted by one or more R6radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted in each case by one or more R6radicals; at the same time, two or more R9radicals together may form an 20 aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; b2 is 0, 1, 2 or 3.

2. An organic light-emitting device according to Claim 1, where Ar* in formula (1) is 25 30 35P24-131 SC - 151 - 5, , where the symbols and indices used are as follows: Y3is O, S, NAr4or C(R5)2, 10 R3is H or R#; R# stands for D, F, CN, or non-deuterated, partially or fully deuterated phenyl; the dashed bond is the bond to the rest of the formula (1); R5is methyl or phenyl which may be partially or fully deuterated or two R5are bonded to form a spirobifluorenyl which may be partiylly or fully deuterated; 15 Ar means phenylene which may be partially or fully deuterated; m is 0 or 1 and Ar4is phenyl, biphenyl or terphenyl which may be partially or fully deuterated.

3. An organic light-emitting device according to Claim 1 or 2 where at least one host 20 material is partially or fully deuterated.

4. An organic light-emitting device according to one or more of Claims 1 to 3, where the host material of formula (1) is selected from one or more of compounds H1 to H48: 25 30 35P24-131 SC - 152 - 5 10 15 20 25 30 35P24-131 SC - 153 - H19 5 H22 10 15 H25 20 H28 25 30 H31 N 35 N NP24-131 SC - 154 - H34 5 10 H37 15 H40 20 25 H43 30 35 H46P24-131 SC - 155 - 5. An organic light-emitting device according to one or more of Claims 1 to 4 where the host material of formula (2) corresponds to one of the formulae (2a) to (2d), 5 10 15 20 25 3035P24-131 SC - 156 - 5 10formula (2d), where the symbols and indices for these formulae are defined as follows: W, W1are the same or different at each instance and are O, S, C(RW)2 or N-Ar5; 15 RWis the same or different at each instance and is a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where one or more hydrogen atoms may be replaced by D, F or CN, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted by one or more substituents selected from D, F, CN, a 20 straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where one or more hydrogen atoms in the alkyl group on the aromatic or heteroaromatic ring system may be replaced by D, F or CN; at the same time, the two RWradicals that bind to the same carbon atom may also form a ring system with one another; 25 A is the same or different at each instance and is CR7or N, where not more than two A groups per cycle are N and where A is C when L2is bonded to that position; a3 is the same or different at each instance and is 0, 1, 2, 3 or 4; b3 is the same or different at each instance and is 0, 1, 2 or 3; 30 Ringis derived from an aryl group which has 6 to 20 ring atoms and may besubstituted by one or more substituents R##; 35P24-131 SC - 157 - L3is an aromatic ring system having 6 to 40 ring atoms or a heteroaromatic ring system having 5 to 40 ring atoms, which may be substituted by one or more R7radicals; and where L2, X, Ar5, R7and R## have the definitions according to Claim 1. 5 6. An organic light-emitting device according to one or more of Claims 1 to 5 where the host material of formula (3) corresponds to formula (3a) 10, where Y, V2, L2, R7and R9have a definition of Claim 1, D is deuterium, a3 is the 15 same or different at each instance and is 0, 1, 2, 3 or 4 and a4 stands for 0, 1 or 2.

7. Organic light-emitting device device according to one or more of Claims 1 to 6, characterized in that it is an electroluminescent device selected from organic light- emitting transistors (OLETs), organic field quench devices (OFQDs), organic light- 20 emitting electrochemical cells (OLECs), organic laser diodes (O-lasers) and organic light-emitting diodes (OLEDs).

8. Organic light-emitting device according to one or more of Claims 1 to 7, characterized in that this organic layer comprises, in addition to the light-emitting layer (EML), a hole 25 injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), an electron transport layer (ETL), an electron injection layer (EIL) and / or a hole blocker layer (HBL) and / or an exciton blocking layer and / or charge generation layers.

9. Organic light-emitting device according to one or more of Claims 1 to 8, characterized 30 in that the light-emitting layer, as well as the at least one host material 1 and the at least one host material 2, comprises at least one further compound selected from the group of matrix materials, phosphorescent emitters, fluorescent emitters and / or emitters having thermally activated delayed fluorescence. 35 10. Organic light-emitting device according to one or more of Claims 1 to 9, characterized in that the light-emitting layer, as well as the at least one host material 1 and the at least one host material 2, contains at least one phosphorescent emitter.P24-131 SC - 158 - 11. Organic light-emitting device according to one or more of Claims 1 to 10, characterized in that the organic layer comprises a hole injection layer (HIL) and / or a hole transport layer (HTL) and / or an electron blocking layer (EBL), the hole-injecting material and / or hole-transporting material and / or electron blocking material of which is 5 a monoamine or diamine that does not contain a carbazole unit.

12. Process for producing an organic light-emitting device according to one or more of Claims 1 to 11, characterized in that the organic layer is applied by gas phase deposition or from solution. 10 13. Mixture comprising at least one compound of the formula (1) and at least one compound of the formula (2) or the formula (3), 15 20 25 30 35formula (3), where the symbols and indices used are as follows:P24-131 SC - 159 - (R)a, (R)b, (R)c, stands on each occurrence identically or differently for a mono- subsitution, a di-substitution, a tri-substitution, a maximum possible substitution with the substituent R, or for no-substitution; R stands for D, a straight or branched alkyl group having 1 to 10 carbon atoms, 5 a heteroaryl group which has 5 to 30 ring atoms or an aryl group which has 6 to 30 carbon atoms and both heteroaryl or aryl group may be substituted by one or more R# radicals; R# stands for D, F, CN, or non-deuterated, partially or fully deuterated phenyl;; L is a single bond or an aromatic divalent linker having 6 to 30 ring atoms and 10 may be substituted in each case by one or more R# radicals; Ar* is an aryl group having 12 to 24 carbon atoms or a heteroaryl group which has 10 to 40 ring atoms and both aryl or heteroaryl group may be substituted by one or more R# radicals; X stands on each occurrence, identically or differently, for N or CR6; 15 L2is the same or different at each instance and is a single bond or an aromatic or heteroaromatic ring system which has 5 to 24 ring atoms and may be substituted in each case by one or more R7radicals; R## is the same or different instance and is D, F, CN or an aromatic ring system which has 6 to 24 ring atoms and may be substituted by one or more R6radicals, 20 and two adjacent substituents R## together may form an aromatic, heteroaromatic, aliphatic, heteroaliphatic ring system that may be substituted by one or more R7radicals; Y is the same or different at each instance and is N or CR9, with exclusion of the possibility that two Y alongside one another are both N; 25 V2is O or S; R6at each instance is the same or different and is D, F, CN, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted 30 by one or more R7radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R7)2, C=O, NR7, O, S or CONR7, or an aromatic or heteroaromatic ring system which has 5 to 60 ring atoms and which may be partially or completely deuterated in each case; it is also possible here for two R6radicals together to form an aromatic, heteroaromatic, aliphatic, or 35 heteroaliphatic ring system; Ar5is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted by one or more R7radicals;P24-131 SC - 160 - R7is the same or different at each instance and is D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group 5 having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R8radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and which may be partially or completely deuterated in each case; at the 10 same time, two or more R7radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; R8is the same or different at each instance and is H, D, F or an aliphatic, aromatic or heteroaromatic organic radical, especially a hydrocarbyl radical, having 1 to 20 carbon atoms, in which one or more hydrogen atoms may also be replaced 15 by F; R9is the same or different at each instance and is H, D, F, Cl, Br, I, N(R8)2, CN, NO2, OR8, SR8, Si(R8)3, B(OR8)2, C(=O)R8, P(=O)(R8)2, S(=O)R8, S(=O)2R8, OSO2R8, a straight-chain alkyl group having 1 to 20 carbon atoms or an alkenyl or alkynyl group having 2 to 20 carbon atoms or a branched or cyclic alkyl group 20 having 3 to 20 carbon atoms, where the alkyl, alkenyl or alkynyl group may in each case be substituted by one or more R6radicals and where one or more nonadjacent CH2 groups may be replaced by Si(R8)2, C=O, NR8, O, S or CONR8, or an aromatic or heteroaromatic ring system which has 5 to 40 ring atoms and may be substituted in each case by one or more R6radicals; at the 25 same time, two or more R9radicals together may form an aromatic, heteroaromatic, aliphatic or heteroaliphatic ring system; b2 is 0, 1, 2 or 3.

14. Mixture according to Claim 13, characterized in that the mixture comprises at least one 30 further compound selected from the group of matrix materials, phosphorescent emitters, fluorescent emitters and / or emitters having thermally activated delayed fluorescence.

15. Mixture according to Claim 13, characterized in that the mixture consists of at least 35 one compound of the formula (1), at least one compound of the formula (2) and / or of the formula (3) and a phosphorescent emitter.

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