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Updated: Feb 12, 2026

Production and Targeting of Monovalent Quantum Dots
Published on: October 23, 2014
Evidence of homo-FRET in quantum dot-dye heterostructured assembly
Samyabrata Saha1, Debashis Majhi1, Kalishankar Bhattacharyya2
1School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, Khurda-752050, India. msarkar@niser.ac.in.
Abstract:
With an aim to understand the intermolecular/particle interaction and the optical properties of the inorganic-organic hybrid nanostructured materials, Förster resonance energy transfer (FRET) between negatively charged CdS quantum dots (donor) and positively charged Oxazine 170 perchlorate (acceptor) has been investigated by employing steady-state and time-resolved fluorescence spectroscopy. Investigations revealed that size-dependent changes in the FRET efficiency of different QD-dye FRET pairs occurred mainly due to the electrostatic effects. Interestingly, the present study also reveals that at a higher concentration of dye molecules, aggregation occurs on the QD surface and the quenching of dye fluorescence occurs due to homo-FRET process. The homo-FRET process in this case has been established by exploiting steady-state fluorescence anisotropy measurements. The feasibility of aggregate formation and the homo-FRET interaction between the dye molecules has also been demonstrated through quantum mechanical calculations.
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