Abstract
Fluorescence spectra of the copolymers in organic solution showed predominant monomer fluorescence of the naphtyl (Np) residues even when the Np content in the copolymers is as high as 58 mol%. In aqueous solutions the copolymers showed a strong preference for excimer emission. The excimer intensity increased with increasing Np content. The results imply that little or no self-quenching site exists and rapid singlet energy migration occurs solely to preformed excimer sites in the copolymers with a higher Np content in aqueous solutions.
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