title: Fluorescence lifetimes and correlated photon statistics from single CdSe/oligo(phenylene vinylene) composite nanostructures.
abstract: We present measurements of fluorescence intensity trajectories and associated excited-state decay times from individual CdSe/oligo(phenylene vinylene) (CdSe-OPV) quantum dot nanostructures using time-tagged, time-resolved (TTTR) photon counting techniques. We find that fluorescence decay times for the quantum dot emitter in these composite systems are at least an order of magnitude shorter than ZnS-capped CdSe quantum dot systems. We show that both the blinking suppression and associated lifetime/count rate behavior can be described by a modified version of the diffusive reaction coordinate model which couples slow fluctuations in quantum dot electron (1Se, 1Pe) energies to Auger-assisted hole trapping processes, hence modifying both blinking statistics and excited-state decay rates.
authors.affiliation: George R. Richason, Jr. Chemistry Research Laboratory, Department of Chemistry , University of Massachusetts, Amherst, Massachusetts 01003, USA.
authors.forename: M Y
authors.initials: MY
authors.lastname: Odoi
authors.forename: N I
authors.initials: NI
authors.lastname: Hammer
authors.forename: K T
authors.initials: KT
authors.lastname: Early
authors.forename: K D
authors.initials: KD
authors.lastname: McCarthy
authors.forename: R
authors.initials: R
authors.lastname: Tangirala
authors.forename: T
authors.initials: T
authors.lastname: Emrick
authors.forename: M D
authors.initials: MD
authors.lastname: Barnes
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry* / Q000528:radiation effects; D003198:Computer Simulation; D003460:Crystallization / Q000379:methods; D003627:Data Interpretation, Statistical; D019544:Equipment Failure Analysis; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D017785:Photons; D011108:Polymers / Q000737:chemistry*; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry* / Q000528:radiation effects; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013223:Statistics as Topic
chemical_list: D019187:Cadmium Compounds; D046911:Macromolecular Substances; D011108:Polymers; D018036:Selenium Compounds; C058667:cadmium selenide