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