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Total number
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0219U100054,
0117U006220
,
Influence of plasmon resonances of metallic nanoparticles on exciton dynamics in organic nanoclusters.
Ropakova Iryna Yu.,
13-01-2019
Institute for scintillation materials
Features of plasmon-enhanced fluorescence in pseudoisocyanine (PIC) J-aggregates formed in polyelectrolyte films at liquid nitrogen temperature have been studied. Due to efficient exciton self-trapping in polymer-bound PIC J-aggregates, their fluorescence spectrum consists of two well-separated bands: near-resonant narrow band of free excitons and red-shifted wide band of self-trapped excitons. It has been found that the interaction with plasmon resonance of gold nanoparticles at optimal distance between nanoparticles and J-aggregates in hybrid complexes leads to the increase of free exciton fluorescence, while self-trapped exctions emission slightly decreases. Suppression of exciton self-trapping due to plasmon-induced an exciton coherence length enhancement has been supposed. The self-trapping suppression is confirmed by both exciton-phonon coupling decrease and free exciton lifetime increase.
2020-04-02
Updated: 2025-12-07
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