TECHNOLOGY FOCUS - POLYMERS - Preparation: No preparation method is given. Preferred Components: The polymer comprises further structural units of formula (S1-L-Ar5-Y2(Ar6)-L-Ar6) (II), (III), (IV), (S1-L2-M(L3)r (V) and (VII).Y2 = N, B, Si(Ar4), SiR5, Ge(Ar4), GeR5, P or As;Ar5 = a bivalent, mono- or polycyclic, aromatic or heteroaromatic ring system with 5-60 aromatic ring atoms, which can be substituted by R1;Ar6 = a mono- or polycyclic, aromatic or heteroaromatic ring system with 5-60 aromatic ring atoms, which can be substituted with R1;R5 = H, D, F, Cl, Br, I, N(Ar3)2, CN, NO2, Si(R2)3, B(OR2)2, C(=O)Ar3, P(=O)(Ar3)2, S(=O)Ar3, S(=O)2Ar3, -CR2=CR2(Ar3), tosylate, triflate, OSO2R2, a straight chain alkyl-, alkoxy- or thioalkoxy with 1-40C or a branched or cyclic alkyl-, alkoxy or thioalkoxy with 3-40C, which respectively substituted by R2, where at least one adjacent CH2 group is replaced by Y1 and at least one H group is replaced by Z1, or an aryloxy or hetero aryloxy with 5-60 aromatic ring atoms, which can be substituted by R2;i = 0-4;L1 = L;n = 0-3;Ar7 = mono- or polycyclic, aromatic or heteroaromatic ring system with 5-60 aromatic ring atoms, which can be substituted with R1;L2, L3 = mono or polydentate ligand;M = a transition metal, a main group metal, a lanthanide or actinide;r = 0-7, depending on the denticity of the ligands L2 and L3 and the coordination number of the metal M;V, W = C(Ar3)2, C(R5)2, Si(Ar3)2, Si(R5)2, Ge(Ar3)2, Ge(R5)2, C=O, O, S, Se, N(Ar4), N(R5), P(Ar4), P(R5), P=O(Ar3), P=O(R5), B or (R5)2CO; andAr8 = mono- or polycyclic, aromatic or heteroaromatic ring system with 5-60 aromatic ring atoms, which can be substituted by R1.Where two or more neighboring substituents R5 can be linked with each other over a covalent single bond or a bivalent group of Z. Provided that when n is greater than 1, maximum L1 can be aromatic or heteroaromatic ring system. Preferred Definitions:    Ar1 = phenyl, biphenyl, fluorene, carbazole, phenanthrene, dihydrophenanthrend, spirobifluorene, pyridyl, furanyl, naphthyl, anthracyl, pyrene, dihydropyrene, chrysene, perylene, tetracene, pentacene or benzpyrene (all substituted by R1); and    Ar2 = phenylene, biphenyl, fluorene, carbazole, phenanthrene, dihydrophenanthrene, spirobifluorene, pyridylene, furan, naphthylene, anthracycline, pyrene, dihydropyrene, chrysene, perylene, tetracene, pentacene or benzpyrene.    EXAMPLE - No suitable example given.