NOVELTY - Polymer containing at least 0.5 mol.% of an unit (III), is new.    USE - The polymer is useful for the preparation of a mixture, solution and formulation. The polymer is useful in an organic electronic structural units, preferably organic optoelectronic structural units (all claimed) such as organic circuits, organic integrated circuits, organic field-effect transistors, organic triodes, organic thin film transistors, organic solar cells, organic color solar cells, organic photo-voltaic cells, organic field quench devices, organic polymer light diodes or organic laser diodes. The polymer is useful as electrical luminescent materials in polymer light emitting diodes, and in mobile applications (mobile phone display, pager) and rechargeable batteries.    ADVANTAGE - The polymer exhibits high light efficiency without consuming high energy, operating life time, preferably in green and blue emission polymer light emitting displays, good electron injection- and conducting characteristics.    DETAILED DESCRIPTION - Polymer containing at least 0.5 mol.% of an unit of formula (III), is new.    M = 2-40C- (hetero)aromatic or non-aromatic ring system, which is optionally substituted by one or more R1; either    X1, X2 = bridge, that stretches with M cyclic system of B(R1), C(R1)2, Si(R1)2, Ge(R1)2, C=O, C=S, C=Se, C=Te, C=NR1, C=C(R1)2, O, S, S=O, SO2, S(R1)2, N(R1), P(R1), P(=O)R1, P(=S)R1, P=O, P=S, P=Se, P=Te, Se or Te; or    X1X2 = optionally substituted double bond (-CR1=CR1) or triple bond;    Y1-Y3 = X1;    J = a connection to the polymer, such as a bond, unsaturated or substituted double bond (-CR2=CR2-), triple bond, an unsubstituted or (hetero)aromatic, or aromatic cyclic unit substituted with R1 or -N-Ar; either    R1 = N, F, Cl, Br, I, CN, NO2, NH2, Si(CH3)3, cyclic 1-40C- alkyl, -(thio)alkoxy, -amino (optionally substituted by one or more R2, where one or more non-adjacent CH2 group is optionally substituted by N-R2, O-CO-O, CO-O, CH=CH, R2C=CR2, Ctriple bondC, Si(R2)2, Ge(R2)2, Sn(R2)2, C=O, C=S, C=Se, C=NR2, O, S or CONR2, and one or more H is optionally substituted by F, Cl, Br, I, CN or NO2), 2-40C (hetero)aromatic ring system (optionally substituted by one or more R2) and/or 2-40C-(hetero)aryloxy (optionally substituted by one or more R2); or    2 or more R1 = mono or polycyclic aliphatic ring system;    R2 = H, halo, NO2, CN, NH2, N(R3)2 or aliphatic, (hetero)aromatic 1-20C-hydrocarbon; either    R3 = cyclic 1-10C-alkyl or alkoxy, or 2-24C-(hetero)aromatic ring system (optionally substituted by one or more R2); or    2R3 = mono- or poly- cyclic ring system;    n, m, p = 0-2; and    q = 1 to 106.    Where at least n or m is 1 or 2. INDEPENDENT CLAIMS are included for:    (1) a bifunctional monomer compound of formula (IV);    (2) mixtures (blends) obtained form the polymer and at least another polymer, oligomer, dendritic and/or lower molecular substance; and    (3) solutions and formulations obtained form the polymer or mixture in at least a solvent.    A = a group that copolymerize C-C and/or C-N bonds.