TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polymer further contains structural elements (such as triarylamine, benzidine, tetra aryl-p-phenylene diamine, triarylphosphine, phenothiazine, phenoxazine, dihydrophenazine, thianthrene, dibenzo-p-dioxin, phenoxathiin, carbazole, azulene, thiophene, pyrrole or furan derivatives) for increasing the hole- injection or transport characteristics; heterocycle containing oxygen, sulfur, nitrogen or phosphorus with highest occupied molecular orbital of -4.5 to -6 eV; another structural elements (such as pyridine, pyrimidine, pyridazine, pyrazine, oxadiazole, quinoline, quinoxaline, benzothiadiazole or phenazine derivative, excluding triarylborane) for increasing the electron injection or transport characteristics; heterocycle containing oxygen, sulfur, nitrogen or phosphorus with lowest unoccupied molecular orbital of -2.5 to -4 eV; structural elements, which changes the emission characteristics, such that electrophosphorescence is obtained instead of electrofluorescence; structural elements (such as carbazole- and bridged carbazole dimer unit, ketone, phosphine oxide, sulfoxide, sulfone or silane derivatives), which improves the transition of singlet to triplet state; structure elements such as 1,4-phenylene-, 1,4-naphthalene-, 1,4- or 9,10- anthracene-, 2,7- or 3,6- phenanthralene-, 1,6-, 2,7- or 4,9-pyrenylene-, 3,9- or 3,10- perylenylene-, 4,4'-biphenylylene-, 4,4''-terphenylylene-, 4,4'-bi-1,1'-naphthylylene-, 4,4'-tolanylene-, 4,4'-stilbenylene- or 4,4''-bisstyrylarylene- derivatives; structure elements (as backbone) such as 4,5-dihydropyrene-, 4,5,9,10-tetrahydropyrene-, fluorine-, 9,9'-spirobifluorene-, phenanthrene-, 9,10-dihydrophenanthrene-, 5,7- dihydrodibenzo oxepine-, or cis and trans- indenofluorene -derivative. Preferred Components: (III) contains at least two structure units having the structural elements. In formula (III):    Either R1 = cyclic 2-15C-alkyl (in which one or more non-adjacent C atoms are substituted by N-R2, O, S, O-CO-O, CO-O, CH=CH- or -C?=C, and one or more H are substituted by F or CN), or 4-20C-(hetero)aromatic group (optionally substituted by R1); or    2R1 = a mono- or poly- cyclic, aromatic or aliphatic ring system;    q = 1-10; either    X1, X2 = a bridge (which stretches M with a cyclic system) such as C=O, C(R1)2, C=C(R1)2, O, S, S=O, SO2, S(R1)2, N(R1), P(R1) and/or P(=O)R1; or    X1X2 = optionally substituted double bond (CR1=CR1) or triple bond (-Ctriple bondC-); either    Y1-Y3 = X1; or    2Y1, 2Y2, 2Y3 = optionally substituted double bond (CR1=CR1) or triple bond (Ctriple bondC); and    M = 2-40C-aromatic ring system (optionally substituted with one or more R1).    In formula (IV):    A = Cl, Br, I, O-tosylate, O-triflate, O-mesylate, O-nonaflate, SiMe3-nFn, O-SO2R1, B(OR1)2, CR1=C(R1)2, C-CH or Sn(R1)3; and    n = 1 or 2.    EXAMPLE - No suitable example given.