Small colloidal semiconductor nanoncrystals display interesting fluorescence properties and hold promise for next generation solid state lighting applications.  These structures show both a narrow core and a broad surface emission peak. The chemical environment of the surface of these structures permits modulation of the ratio of those two peaks through which eye-pleasing white light can be created. Due to their well-defined core and surface emission bands, small nanocrystals are uniquely suited as a model system for photo physical studies. Yet few studies have taken advantage of theoretical advances in surface trapping to guide rational design of nanocrystal surfaces for white light applications.Here we demonstrate the effects of different quenchers on the radiative properties of a variety of small nanocrystals, using steady state and time dependent fluorescence measurements.  A systematic approach of comparing different ligand-quencher interactions give insight into physics of surface emission. For these studies, the effects of quenchers on small CdSe nancrystals with different ligands are compared to their effects on small CdSe/CdS core-shell heterostructures. In addition Iodine is compared to quenchers traditionally used in nanocrystal quenching studies (ie. butylamine).

Fluorescence quenching study of small colloidal nanocrystals yields insight into surface trapping processes

248th National Meeting (2014)

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