Abstract

Highly fluorescent organic nanoparticles are synthesized via ion-association between 3,3′-diethylthiacyanine (TC) cation and tetrakis(4-fluorophenyl)borate anion in the presence of a neutral stabilizing polymer in water. The fluorescence shows a significant increase with a decrease in the nanoparticle size, resulting in a high fluorescence quantum yield of about 0.8–0.9. The observed fluorescence enhancement is due to a synergetic effect of both restriction of intramolecular rotation of TC and intermolecular H-aggregation in an inclined manner.

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