NOVELTY - Polymer comprising at least one carbazole structural unit (I) and at least one arylamine structural unit (II) and/or (III), is new.    USE - The polymer is useful as a component of hole transport- or hole injection layer in electronic devices, preferably organic electroluminescent devices (organic light-emitting diodes), polymer electroluminescent devices (polymer light-emitting diodes), organic integrated circuits, organic field-effect transistors, organic thin film transistors, organic light emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, light-emitting electrochemical cells or organic laser diodes (all claimed).    ADVANTAGE - The polymer: exhibits high light output; and achieves specific luminous flux with less electrical power. The organic device comprising the polymer: exhibits long service life and excellent efficiency in a cost-effective manner with constant quality; works over wide range of temperature; and makes use of lower voltage.    DETAILED DESCRIPTION - Polymer comprising at least one carbazole structural unit of formula (I) and at least one arylamine structural unit of formula (Z-Ar4-N(Ar5)-(Ar6)p-(N(Ar7)-Ar8)q-Z) (II) and/or (Z-N(Ar5)-(Ar6)p-N(Ar7)-Z) (III), is new.    Ar1-Ar5, Ar7, Ar8 = (hetero)aryl (optionally substituted by at least one group R);    m, o, q = 0 or 1;    n, p = 1-3;    Ar6 = (hetero)aryl (optionally substituted by at least one group R) or (Ar9-Y1-Ar9);    Ar9 = (hetero)aryl (optionally substituted by at least one group R), where Ar9 may be linked with each other;    Y1 = spacer group or direct bond;    Z = linkage of (II) or (III) with the polymer; either    R = 1-40C alkyl, 1-40C (thio)alkoxy (both linear), 3-40C alkyl, 3-40C (thio)alkoxy (both branched or cyclic) (in all groups at least one non-adjacent CH2 group may be replaced by R11C=CR11, CC, Si(R11)2, Ge(R11)2, Sn(R11)2, C=O, C=S, C=Se, C=NR11, P(=O)(R11), SO, SO2, NR11, O, S or CONR11 and at least one H may be replaced by F, Cl, Br, I, CN or NO2), (hetero)aromatic ring with 5-60 ring atoms, (hetero)aryloxy with 5-60 ring atoms (all optionally substituted by at least one group R11), crosslinkable group, H, F, Cl, Br, I, N(A)2, N(R11)2, CN, NO2, Si(R11)3, B(OR11)2, C(=O)A, C(=O)R11, P(=O)(A)2, P(=O)(R11)2, S(=O)A, S(=O)R11, S(=O)2A, S(=O)2R11, -CR11=CR11A and/or OSO2R11; or    at least 2R = mono- or polycyclic, aliphatic or aromatic ring;    R11 = H, aliphatic or aromatic 1-20C hydrocarbon; and    A = 2-30C (hetero)aryl.    INDEPENDENT CLAIMS are also included for:    (1) preparing the polymer;    (2) a formulation comprising the above polymer in at least one solvent; and    (3) producing the electronic device, comprising applying at least one layer containing the above polymer in the form of solution on a substrate by a printing process.    DESCRIPTION OF DRAWING(S) - The drawing 1 shows a schematic representation of the construction of the polymer light-emitting diode. The drawing includes non-English language text. The drawing 2 shows a schematic top view of the polymer light-emitting diode.