title: Continuous distribution of emission states from single CdSe/ZnS quantum dots.
abstract: The photoluminescence dynamics of colloidal CdSe/ZnS/streptavidin quantum dots were studied using time-resolved single-molecule spectroscopy. Statistical tests of the photon-counting data suggested that the simple "on/off" discrete state model is inconsistent with experimental results. Instead, a continuous emission state distribution model was found to be more appropriate. Autocorrelation analysis of lifetime and intensity fluctuations showed a nonlinear correlation between them. These results were consistent with the model that charged quantum dots were also emissive, and that time-dependent charge migration gave rise to the observed photoluminescence dynamics.
authors.affiliation: Department of Chemistry, University of California, Berkeley, California 94720, USA.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.forename: Hauyee
authors.initials: H
authors.lastname: Chang
authors.forename: Aihua
authors.initials: A
authors.lastname: Fu
authors.forename: A Paul
authors.initials: AP
authors.lastname: Alivisatos
authors.forename: Haw
authors.initials: H
authors.lastname: Yang
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry* / Q000528:radiation effects; D003198:Computer Simulation; D008027:Light; D008163:Luminescent Measurements; D008422:Materials Testing; D008956:Models, Chemical; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry* / Q000528:radiation effects; D013440:Sulfides / Q000737:chemistry* / Q000528:radiation effects; D017967:Zinc Compounds / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; C058667:cadmium selenide; C031238:zinc sulfide