Composition for organic electronic devices

A composition comprising at least one compound of the formula (1a) and at least one compound of the formula (2)

• where the following applies to the symbols and indices used:
• V is a bond, C(R0)2, O or S;
• v is 0 or 1;
• X2 is on each occurrence, identically or differently, CR1 or N;
• Z is C(R0)2, NR1, O or S;
• N is 0 or 1;
• Ar1 and Ar2 are in each case, independently of one another, selected from aromatic or heteroaromatic ring systems from Ar-1 to Ar-15 and Ar-20 to Ar-22
• Y3 on each occurrence, identically or differently, denotes O, NR#, S or C(#)2, where the radical
• R# is on each occurrence, identically or differently, H, D, F, Cl, Br, I, CN, NO2, N(Ar)2, N(R2)2, C(═O)Ar, C(═O)R2, P(═O)(Ar)2, P(Ar)2, B(Ar)2, Si(Ar)3, Si(R2)3, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms or an alkenyl group having 2 to 20 C atoms, which may in each case be substituted by one or more radicals R2, where one or more non-adjacent CH2 groups may be replaced by R2C═CR2, Si(R2)2, C═O, C═S, C═NR2, P(═O)(R2), SO, SO2, NR2, O, S or CONR2 and where one or more H atoms maybe replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may in each case be substituted by one or more radicals R2,
• dashed bond represents the bond to the C atom which carries the respective substituent R;
• R0 is on each occurrence, identically or differently, a straight-chain or branched alkyl group having 1 to 4 C atoms or both R0 form a monocyclic or polycyclic, aliphatic, aromatic or heteroaromatic ring system, which may be substituted by one or more radicals R2;
• R is selected on each occurrence, identically or differently, from the group consisting of H, D, F, Cl, Br, I, CN, NO2, N(Ar)2, N(R2)2, C(═O)Ar, C(═O)R2, P(═O)(Ar)2, P(Ar)2, B(Ar)2, Si(Ar)3, Si(R2)3, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms, a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms and an alkenyl group having 2 to 20 C atoms, which may in each case be substituted by one or more radicals R2, where one or more non-adjacent CH2 groups may be replaced by R2C═CR2, Si(R2)2, C═O, C═S, C═NR2, P(═O)(R2), SO, SO2, NR2, O, S or CONR2 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may in each case be substituted by one or more radicals R2, or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R2, or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R2;
• two substituents R which are bonded to the same carbon atom or to adjacent carbon atoms may optionally form a monocyclic or polycyclic, aliphatic, aromatic or heteroaromatic ring system, which may be substituted by one or more radicals R2;
• R1 is selected on each occurrence, identically or differently, from the group consisting of H, D, F, Cl, Br, I, CN, NO2, N(Ar)2, N(R2)2, C(═O)Ar, C(═O)R2, P(═O)(Ar)2, P(Ar)2, B(Ar)2, Si(Ar)3, Si(R2)3, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms, a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms and an alkenyl group having 2 to 20 C atoms, which may in each case be substituted by one or more radicals R2, where one or more non-adjacent CH2 groups may be replaced by R2C═CR2, Si(R2)2, C═O, C═S, C═NR2, P(═O)(R2), SO, SO2, NR2, O, S, or CONR2 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may in each case be substituted by one or more radicals R2, or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R2, or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R2, where the heteroaromatic ring system having 5 to 40 aromatic ring atoms in R1 is dibenzofuran, dibenzothiophene or 9-phenylcarbazole, which may be substituted by one or more radicals R2;
• R2 is selected on each occurrence, identically or differently, from the group consisting of H, D, F, Cl, Br, I, CN, NO2, N(Ar)2, NH2, N(R3)2, C(═O)Ar, C(═O)H, C(═O)R3, P(═O)(Ar)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 40 C atoms, a branched or cyclic alkyl, alkoxy or thioalkyl group thioalkyl group having 3 to 40 C atoms and an alkenyl or alkynyl group having 2 to 40 C atoms, which may in each case be substituted by one or more radicals R3, where one or more non-adjacent CH2 groups may be replaced by HC═CH, R3C═CR3, C═C, Si(R3)2, Ge(R3)2, Sn(R3)2, C═O, C═S, C═Se, C═NR3, P(═O)(R3), SO, SO2, NH, NR3, O, S, CONH or CONR3 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R3, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R3, or a combination of these systems, where two or more adjacent substituents R2 may optionally form a monocyclic or polycyclic, aliphatic, aromatic or heteroaromatic ring system, which may be substituted by one or more radicals R3;
• R3 is selected on each occurrence, identically or differently, from the group consisting of H, D, F, CN, an aliphatic hydrocarbon radical having 1 to 20 C atoms, an aromatic ring system having 6 to 30 ring atoms and a heteroaromatic ring system having 10 to 30 ring atoms, in which one or more H atoms may be replaced by D, F, Cl, Br, I or CN and which may be substituted by one or more alkyl groups, each having 1 to 4 carbon atoms;
• two or more adjacent substituents R3 may form a mono- or polycyclic, aliphatic ring system with one another;
• and
• with the proviso the substituent R3 in structures Ar-1 to Ar-15 and Ar-20 to Ar-22 is selected on each occurrence, identically or differently, from the group consisting of H, D, F, CN, an aliphatic hydrocarbon radical having 1 to 20 C atoms and an aromatic or heteroaromatic ring system having 6 to 30 aromatic ring atoms, in which one or more H atoms maybe replaced by D, F, Cl, Br, I or CN and which may be substituted by one or more alkyl groups, each having 1 to 4 carbon atoms and where the heteroaromatic ring system is selected from dibenzofuran, dibenzothiophene or 9-phenylcarbazole;
• Ar is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more non-aromatic radicals R3;
• two radicals Ar which are bonded to the same N atom, P atom or B atom may also be bridged to one another by a single bond or a bridge selected from N(R3), C(R3)2, O or S.