Abstract
The photoexcitation energy transfer is found and investigated in complexes of CdSe/ZnS cationic quantum dots and chlorin e6 molecules formed by covalent bonding and electrostatic interaction in aqueous solution and in porous track membranes. The quantum dots and chlorin e6 molecules form stable complexes that exhibit Förster resonance energy transfer (FRET) from quantum dots to chlorin e6 regardless of complex formation conditions. Competitive channels of photoexcitation energy dissipation in the complexes, which hamper the FRET process, were found and discussed.
Highlights
During the last decade, photophysical properties of the complexes formed by colloidal quantum dots (QDs) and organic molecules, in particular, complexes of QDs and tetrapyrrole compounds, were widely investigated [1,2,3,4]
In this study we investigate the photophysical properties of QD–Chlorin e6 (Ce6) complexes under variable conditions of formation such as the molar concentration ratio n, the binding type, the ambient environment and the size of the QDs in order to understand the intracomplex photoexcitation energy transfer processes like Förster resonance energy transfer (FRET) and other competitive energy transfer mechanisms
The photophysical properties of complexes of CdSe/ZnS cationic quantum dots and chlorin e6 molecules formed by covalent bonding and electrostatic interaction in aqueous solution and Poly(ethylene terephthalate) (PET) membranes were investigated
Summary
Photophysical properties of the complexes formed by colloidal quantum dots (QDs) and organic molecules, in particular, complexes of QDs and tetrapyrrole compounds, were widely investigated [1,2,3,4]. In QD–tetrapyrrole complexes, a formation of competitive channels of nonradiative photoexcitation energy dissipation different from FRET may take place for both donor and acceptor [4]. For the complexes, formed via electrostatic interaction, the hydrophobic CdSe/ZnS/TOPO QDs with a core diameter of 5.0 nm were solubilized with DMAET molecules to provide a positive charge on the QD surface.
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