Aggregation-Induced F枚rster Resonance Energy Transfer in Polybenzofulvene/Dye Nanoparticles

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• 作者：Francesca Villafiorita-Monteleone ; Andrea Cappelli ; Marco Paolino ; Miriam Colombo ; Elena Cariati ; Andrea Mura ; Giovanni Bongiovanni ; Chiara Botta
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：August 20, 2015
• 年：2015
• 卷：119
• 期：33
• 页码：18986-18991
• 全文大小：391K
• ISSN：1932-7455

文摘

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 蟺-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 F枚rster resonance energy transfer (FRET) process from the polymer to the molecularly embedded dye activated at a local concentration of about 10^鈥? M within the nanoparticles.