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PECASE: Organic Ligands as Tools to Analyze and Control Electronic Relaxation in Flourescent Quantum Dots

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Northwestern University Evanston Campus Evanston Cam United States

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The major goals of this study are i identify general categories of nonradiative decay processes from both the lowest-energy band-edge excited state and higher-lying states present in CdSe QDs ii identify the rates and specific mechanisms by which these processes dephase or relax the excited states of the QD iii identify the physical and chemical features of the QD surfaces that promote or enable each decay process and ivdecrease the contribution of nonradiative decay and, thereby increase PL quantum yield, by synthetically altering the surface chemistry of the QDs. To achieve these objectives, we will use the ligands themselves as probes we will produce a series of solution-phase CdSe QD-ligand systems, where the electronic and chemical properties of the ligands, and the percent of surface sites covered by the ligands, vary systematically.

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Technical Report,10 Feb 2011,09 Feb 2016



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Approved For Public Release;

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