Polymeric nanoparticles are versatile scaffolds to develop smart multichromophoric systems whose collective optical properties can be tuned in view of a specific application. Addition of water (nonsolvent) to diluted THF solutions of a blue emitting pi-stacked polymer and a yellow emitting dye induces nanoparticle polymer/dye coaggregation. At 70% water content, concomitantly to nanoparticle shrinking, the emission efficiency increases and the color switches from blue to yellow. Time-resolved fluorescence analysis demonstrates that the switch in the nanoparticle emission is governed by an aggregation-induced Forster resonance energy transfer (FRET) process from the polymer to the molecularly embedded dye activated at a local concentration of about 10(-2) M within the nanoparticles.
Aggregation-Induced Förster Resonance Energy Transfer in Polybenzofulvene/Dye Nanoparticles / F. Villafiorita Monteleone, A. Cappelli, M. Paolino, M. Colombo, E. Cariati, A. Mura, G. Bongiovanni, C. Botta. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - 119:33(2015), pp. 18986-18991. [10.1021/acs.jpcc.5b05589]
Aggregation-Induced Förster Resonance Energy Transfer in Polybenzofulvene/Dye Nanoparticles
E. Cariati;
2015
Abstract
Polymeric nanoparticles are versatile scaffolds to develop smart multichromophoric systems whose collective optical properties can be tuned in view of a specific application. Addition of water (nonsolvent) to diluted THF solutions of a blue emitting pi-stacked polymer and a yellow emitting dye induces nanoparticle polymer/dye coaggregation. At 70% water content, concomitantly to nanoparticle shrinking, the emission efficiency increases and the color switches from blue to yellow. Time-resolved fluorescence analysis demonstrates that the switch in the nanoparticle emission is governed by an aggregation-induced Forster resonance energy transfer (FRET) process from the polymer to the molecularly embedded dye activated at a local concentration of about 10(-2) M within the nanoparticles.File | Dimensione | Formato | |
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