Patent ID: 7132174

Claim:
A copolymer comprising: a first monomeric unit comprising an electron-rich group; a second monomeric unit comprising an electron-deficient group; and a fluorophore monomeric unit wherein, within the copolymer, a number of the fluorophore monomeric unit comprises no more than approximately five percent of a sum of a number of the first and second monomeric units, wherein the fluorophore monomeric unit comprises a dye having a molecular structure selected from: wherein: Rd can be the same or different at each occurrence and is selected from hydrogen, halogen, alkyl, alkoxy, and alkylamino groups; n is a number of potential sites in a corresponding aromatic group capable of substitution by Rd; and the dye may be selected from a combination of the above aromatic groups connected by a single bond, ethenyl or ethynyl group.