Efficient and tunable fluorescence energy transfer via long-lived polymer excitons

A highly fluorescent polymer consisting of repeating pendant dye molecules, difluoroboron dibenzoylmethane (BF2dbm), and an end-capped Rhodamine B (RhB) exhibits efficient energy transfer (EnT) owing to long-lived polymer excitons. External stimuli such as solvation and temperature can dramatically affect the efficiency of EnT and thus change the emission color.