Multi-functional copolymers comprising rare earth metal complexes and devices thereof

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The invention relates to copolymer complexes of the formula (I) : wherein [Ax-[B(C)]y-Dz] denotes a single unit of the copolymer complex that is repeated n times, wherein n is an integer greater than one, and wherein the single unit comprises a conjugated backbone coordinated to a complex (C) comprising rare earth metal(s); x, y and z are numbers greater than zero such that x=y+z; A is independently selected from a group consisting of : fluorene, carbazole, oxadiazole, triphenylamine or derivatives thereof; B is a functional ligand selected from the group consisting of : benzoic acid, 1, 3-diphenylpropane-1, 3-dione, 1, 10-phenanthroline, 2, 2-bipyridine, or derivatives thereof; and D is independently selected from a group consisting of : fluorene, carbazole, oxadiazole, triphenylamine or derivatives thereof.