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- W1992505824 abstract "We report the formation and photonic properties of CdSe/ZnS quantum dot (QD)/J-aggregate donor−acceptor Forster resonant energy transfer (FRET) pairs that are electrostatically bound and dispersed in water. Assembly occurs when the positively charged dye, 1,1′,3,3′-tetraethyl-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine (TTBC), binds electrostatically to QDs that are coated with a negatively charged amphiphilic polymer. QD/J-aggregate FRET pairs display the broadband absorption in the visible and the ultraviolet (UV) part of the spectrum typical of quantum dots, along with the narrow emission linewidths characteristic of J-band emitters (∼12 nm full width at half-maximum). We use dynamic light scattering, transmission electron microscopy, photoluminescence spectroscopy, and photoluminescence lifetimes to conclude that the size of the aggregates formed in the presence of QDs is between 1−6 nm. We find the FRET radius of the QD/J-aggregate to be 5.1 nm. We further demonstrate electrostatic binding as a general synthetic strategy for these types of FRET pairs by attaching a negatively charged J-aggregate (BIC) to a quantum dot coated with positively charged ligands." @default.
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- W1992505824 date "2009-05-13" @default.
- W1992505824 modified "2023-10-18" @default.
- W1992505824 title "Electrostatic Formation of Quantum Dot/J-aggregate FRET Pairs in Solution" @default.
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- W1992505824 doi "https://doi.org/10.1021/jp8099169" @default.
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