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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18930

Title: Optical Properties of Magic-sized Nanocrystals: Absence of Inhomogeneous Line Broadening and Direct Evidence of Energy Transfer Between Two Magic Sizes
Authors: Nagy, Michelle
Advisor: Scholes, Gregory D.
Department: Chemistry
Keywords: Magic-sized nanocrystals
Photoluminescence
Inhomogeneous line broadening
Energy transfer
CdSe nanocrystals
Issue Date: 15-Feb-2010
Abstract: Magic-sized nanocrystals (MSNs) are nanocrystals with a single size distribution. They have narrow spectral features that do not exhibit inhomogeneous line broadening. This enabled us to analyze homogeneous line broadening of CdSe and CdTe MSNs. In solution, we observed two aggregated configurations of CdSe and CdTe MSNs. Sub-peaks within MSN excitonic peaks were caused by these two aggregated configurations and surface states. A two-dimensional photoluminescence spectrum of a mixture of CdTe 427 nm and 500 nm MSNs gave direct evidence of Förster resonant energy transfer (RET) between the two sizes of MSNs. Normalized experimental overlap between donor emission and acceptor absorption spectra was on the order predicted by theory, confirming that there is sufficient overlap for RET to take place in this system. Additionally, within both aggregated configurations, the two sizes of MSNs were within sufficient distance from one another for RET to occur.
URI: http://hdl.handle.net/1807/18930
Appears in Collections:Master
Department of Chemistry - Master theses

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