NOVELTY - Polymer comprising indenofluorene arylamine derivative (I) as repeating units is new.    USE - The polymer comprising (I) or the mixture is useful in active layers of organic electronic devices, preferably organic or polymeric organic light emitting diodes, organic integrated circuits, organic field-effect transistors, organic thin film transistors, organic solar cells, organic laser diodes, organic photovoltaic elements or devices or organic photoreceptors (all claimed).    ADVANTAGE - The polymer comprising (I) exhibits very high efficiency and longer service life when used in organic light-emitting diodes.    DETAILED DESCRIPTION - Polymer comprising indenofluorene arylamine derivative of formula (I) as repeating units is new.    A1-A3 = 2-23C heteroaryl with 5-24 aromatic ring atoms (optionally substituted by at least one R1) or 6-24C aryl;    Y1 = N, P, P=O, PF2, P=S, As, As=O, As=S, Sb, Sb=O or Sb=S;    A4, A5 = (hetero)aromatic ring with 5-40 aromatic ring atoms (optionally substituted by at least one R1); either    R1 = H, F, Cl, Br, I, CN, NO2, Si(R2)3, straight chain 1-40C alkyl, 1-40C (thio)alkoxy, branched or cyclic 3-40C alkyl, 3-40C (thio)alkoxy (all optionally substituted by at least one R2, where at least one non-adjacent CH2 may be replaced by -R2C=CR2-, -C=C-, Si(R2)2, Ge(R2)2, Sn(R2)2, C=O, C=S, C=Se, C=NR2, -O-, -S- or -CONR2- and at least one H may be replaced by F, Cl, Br, I, CN or NO2), (hetero)aromatic ring with 5-40 aromatic ring atoms (optionally substituted by at least one R2) and/or (hetero)aryloxy with 5-40 aromatic ring atoms (optionally substituted by at least one R2); or    at least two R1 = mono- or polycyclic aliphatic or (hetero)aromatic ring;    R2 = H, aliphatic 1-20C hydrocarbon or aromatic 6-20C hydrocarbon;    X1 = bridge that is connected with A1 and A2 to form cyclic system, comprising B(R1), C(R1)2, Si(R1)2 C=O, C=NR1, C=C(R1)2, O, S, S=O, SO2, N(R1), P(R1), P(=O)R1, P(=S)R1 or a combination of two, three or four of these groups;    X2, X3 = bridge that is connected with A2 and A3 to form cyclic system, comprising B(R1), C(R1)2, Si(R1)2 C=O, C=NR1, C=C(R1)2, O, S, S=O, SO2, N(R1), P(R1), P(=O)R1, P(=S)R1 or a combination of two, three or four of these groups; either    n, o = 0 or 1; or    n+o = 1; and    a = point of attachment to the polymer.    INDEPENDENT CLAIMS are also included for:    (1) preparing the polymer comprising (I);    (2) indenofluorene arylamine derivatives of formula (II)-(IV);    (3) a mixture comprising at least one polymer comprising (I) and further polymeric, oligomeric, dendritic and/or low molecular weight substances;    (4) a solution or a formulation comprising at least one polymer comprising (I) or the above mixture in at least one solvent; and    (5) an organic electronic device comprising at least one active layer containing at least one polymer comprising (I) or the above mixture.    Z1-Z3 = functional groups, which are copolymerize under the conditions of CC- or CN-bonds.