A compound according to formula, wherein the symbols and indices used are as follows: X is the same or different at each occurrence, and is a group of the Formula -(Ar) n -R; Y is the same or different at each occurrence, and is R or X; Z is the same or different and is R or X; Ar is the same or different at each occurrence, and is a bivalent group selected from the structures to, wherein the dashed bond represents the linkage of the structures and V is CR 2, O, S or NR; n is the same or different at each occurrence, and is an integer from 3 to 20, with the proviso that in each unit -(Ar) n -R at least 5 phenyl and/or cyclohexyl groups are linearly connected to each other, wherein the structures and each contribute one phenyl group, structures, and each contribute two phenyl groups, and structures and each contribute one cyclohexane group; R can occur once or more than once, and is the same or different at each occurrence, and is H, D, F, Cl, Br, I, N(R 1) 2, CN, NO 2, OR 1, SR 1, COOH, C(=O)N(R 1) 2, Si(R 1) 3, B(OR 1) 2, C(=O)R 1, P(=O)(R 1) 2, S(=O)R 1, S(=O) 2 R 1, OSO 2 R 1, a linear-chain alkyl group having 1 to 20 C-atoms or an alkenyl or alkynyl group having 2 to 20 C-atoms or a branched or cyclic alkyl group having 3 to 20 C-atoms, wherein the alkyl, alkenyl or alkynyl group can each be substituted by one or more groups R', wherein one or more non-adjacent CH 2 -groups can be replaced by Si(R 1) 2, C=O, NR 1, O, S or CONR 1, or can be an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may each be substituted by one or more groups R 1; and wherein two groups R can optionally together form a ring system; R 1 is the same or different at each occurrence, and is H, D, F, Cl, Br, I, N(R 2)2, CN, NO 2, OR 2, SR 2, Si(R 2) 3, B(OR 2) 2, C(=O)R 2, P(=O)(R 2) 2, S(=O)R 2, S(=O) 2 R 2, OSO 2 R 2, a straight-chain alkyl group having 1 to 20 C-atoms or an alkenyl or alkynyl group having 2 to 20 C-atoms or a branched or cyclic alkyl group having 3 to 20-C atoms, wherein the alkyl, alkenyl or alkynyl group may each be substituted with one or more R 2 radicals, wherein one or more non-adjacent CH 2 groups may be replaced by Si(R 2) 2, C=O, NR 2, O, S or CONR 2, or an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, each of which may be substituted by one or more radicals R 2; and wherein two groups R 1 together can form a ring system; R 2 is the same or different at each occurrence, and is H, D, F or an aliphatic, aromatic or heteroaromatic organic radical, in particular a hydrocarbon radical, having 1 to 20 C-atoms, in which one or more H-atoms may optionally be replaced by F. X is the same or different at each occurrence, and is a group of the Formula -(Ar) n -R; Y is the same or different at each occurrence, and is R or X; Z is the same or different and is R or X; Ar is the same or different at each occurrence, and is a bivalent group selected from the structures to, wherein the dashed bond represents the linkage of the structures and V is CR 2, O, S or NR; n is the same or different at each occurrence, and is an integer from 3 to 20, with the proviso that in each unit -(Ar) n -R at least 5 phenyl and/or cyclohexyl groups are linearly connected to each other, wherein the structures and each contribute one phenyl group, structures, and each contribute two phenyl groups, and structures and each contribute one cyclohexane group; R can occur once or more than once, and is the same or different at each occurrence, and is H, D, F, Cl, Br, I, N(R 1) 2, CN, NO 2, OR 1, SR 1, COOH, C(=O)N(R 1) 2, Si(R 1) 3, B(OR 1) 2, C(=O)R 1, P(=O)(R 1) 2, S(=O)R 1, S(=O) 2 R 1, OSO 2 R 1, a linear-chain alkyl group having 1 to 20 C-atoms or an alkenyl or alkynyl group having 2 to 20 C-atoms or a branched or cyclic alkyl group having 3 to 20 C-atoms, wherein the alkyl, alkenyl or alkynyl group can each be substituted by one or more groups R', wherein one or more non-adjacent CH 2 -groups can be replaced by Si(R 1) 2, C=O, NR 1, O, S or CONR 1, or can be an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may each be substituted by one or more groups R 1; and wherein two groups R can optionally together form a ring system; R 1 is the same or different at each occurrence, and is H, D, F, Cl, Br, I, N(R 2)2, CN, NO 2, OR 2, SR 2, Si(R 2) 3, B(OR 2) 2, C(=O)R 2, P(=O)(R 2) 2, S(=O)R 2, S(=O) 2 R 2, OSO 2 R 2, a straight-chain alkyl group having 1 to 20 C-atoms or an alkenyl or alkynyl group having 2 to 20 C-atoms or a branched or cyclic alkyl group having 3 to 20-C atoms, wherein the alkyl, alkenyl or alkynyl group may each be substituted with one or more R 2 radicals, wherein one or more non-adjacent CH 2 groups may be replaced by Si(R 2) 2, C=O, NR 2, O, S or CONR 2, or an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, each of which may be substituted by one or more radicals R 2; and wherein two groups R 1 together can form a ring system; R 2 is the same or different at each occurrence, and is H, D, F or an aliphatic, aromatic or heteroaromatic organic radical, in particular a hydrocarbon radical, having 1 to 20 C-atoms, in which one or more H-atoms may optionally be replaced by F.