Patent ID: 7432298

Claim:
A fluorescent polymeric material comprising a polymeric particle and a lipid-soluble rhodamine dye according to structural formula (I): wherein: R 1 and R 8 are each, independently of one another, selected from hydrogen, (C1-C8) alkyl and halo, or one of R 1 or R 8 is part of an optionally substituted benzo group with R 2 or R 7 , respectively, and the other one of R 1 and R 8 is selected from hydrogen, (C1-C8) alkyl and halo; R 2 and R 7 are each, independently of one another, selected from hydrogen, (C1-C8) alkyl and halo, or one of R 2 or R 7 is part of an optionally substituted benzo group with R 1 or R 8 , respectively, and the other one of R 2 or R 7 is selected from hydrogen, (C1-C8) alkyl and halo, or R 2 and R 7 are part of optionally substituted 5- or 6-membered rings with R 3′ and R 6′ , respectively; R 3′ and R 6′ are each the same or different (C4-C20) alkyl, or are part of optionally substituted 5- or 6-membered rings with R 2 and R 7 , respectively; R 3″ and R 6″ are each, independently of one another, selected from hydrogen and the same or different (C4-C20) alkyl, or are part of optionally substituted 5- or 6-membered rings with R 4 and R 4 and R 5 , respectively; R 4 and R 5 are each, independently of one another, selected from hydrogen, (C1-C8) alkyl, halo, aryl and heteroaryl, or are part of optionally substituted 5-or 6-membered rings with R 3″ and R 6″ , respectively; R 11 and R 15 are each hydrogen or are each F or Cl; and R 12 , R 13 and R 14 are each hydrogen or are each F or Cl, and wherein the lipid-soluble rhodamine dye is incorporated into the polymeric particle non-covalently.