Abstract: The present invention relates to a polymer composed by two to ten monomers of formula (I) as well as to a process for its preparation and its use as fluorophore wherein: X is a radical of formula (II) wherein —R5 is an electron pair or a (C1-C3)-alkyl radical; —Ra and —Rb are radicals independently selected from the group consisting of H, (C1-C4)-alKyI, (C1-C4)-alkoxy, (C1-C4)-alkylamino, phenyl, F, Cl, Br, amino, hydroxy, and nitro or —Ra and —Rb are fused forming with the carbon atoms to which they are attached a ring of formula (III) with the condition that (I) when —R5 is an electron pair, a is a N?C double bond, and Ra and Rb are fused forming the ring (III), said ring being a biradical selected from (IIIa) and (IIIb), thus, radical (II) is (IIa) or (IIb) respectively (II) when —R5 is a (C1-C3)-alkyl radical, a is a N—C single bond and Ra and Rb are fused forming the ring (III), said ring being a biradical (a), thus, the radical (II) is (IIc) R1-R4 and R7-R18 represent radicals, same or different, select