Photophysical study of fused arene based dyes effective for Förster resonance energy transfer

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Matthew D. Hawkins (Creator)
The University of North Carolina at Greensboro (UNCG )
Web Site:
Hemali Rathnayake

Abstract: This dissertation work investigates the non-radiative energy transfer process in a blend of donor and acceptor of fused arene-based hybrid fluorophore materials. Aiming at understanding molecular interactions in a solvent-solute medium and in a solid-state, the goal is to create an efficient donor-acceptor hybrid system to use as a Foster Resonance Energy transfer (FRET) system for molecular-based optical communications. Broad application of fluorescent moieties is known to be hindered by self-quenching properties. Aggregation and restriction of intramolecular rotation play just as an important role in charge transfer efficiency and emission intensity as do external enhancement techniques. Herein, a significant attention was paid for the understanding of the interaction between 9-anthroic acid (a donor) and a silane branched perylene molecule (PTCBS) (an acceptor) as a FRET pair. This work highlights solvent and solute concentration dependencies on the efficiency of such non-radiative energy transfer mechanisms. We also present evidence, which conditions induce the rate limiting mechanisms that out-compete FRET. Preparation of an anthracene carboxylic acid-anchored PDMS was undertaken as a Donor fluorophore and evaluated for such an energy transfer use case, also. This effort was undertaken to prepare an easily curable fluorescent polymer enabling established thin-film formation protocols to be applicable to energy transfer device fabrication. The PDMS-donor functionalized system has concluded that a functionalized polymer retaining fluorescent activity, yet a synthetic preparation method could not be achieved for appropriate product purity and yield. A final sub-project regarding a siloxane nanoparticle synthesized for improved perylene fluorophore loading was studied. Thin-film formation effectiveness and synthesis parameters were improved to reduce overall nanoparticle diameter. This work showed that whilst decreasing particle diameter allowed for a theoretical maximum of over 97% particle volume to become accessible by a resonant donor, efficacy of monolayer thin-film formation significantly decreased when compared to the previously larger nanoparticles.

Additional Information

Language: English
Date: 2022
Anthracene, Fluorescence, FRET, Perylene
Energy transfer

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