title: Single-dot spectroscopy of zinc-blende CdSe/CdS core/shell nanocrystals: nonblinking and correlation with ensemble measurements.
abstract: Here we report the first series of phase-pure zinc-blende CdSe/CdS core/shell quantum dots (QDs) with reproducibly controlled shell thickness (4-16 monolayers), which are nonblinking (≥95% 'on' time) in single-exciton regime for the entire series. These unique QDs possess well-controlled yet simple excited-state decay dynamics at both single-dot and ensemble levels, extremely small nonblinking volume threshold, if any, and unique 'on' and 'off' probability statistics. The outstanding optical properties of the QDs at the single-dot level were found to be correlated well with their ensemble properties. These small and bright nonblinking QDs offer promising technical application prospect in both single-dot and ensemble levels. The consistent and reproducible experimental results shed new light on the mechanisms of blinking of QDs.
authors.affiliation: Center for Chemistry of Novel and High-Performance Materials, and Department of Chemistry, Zhejiang University , Hangzhou, 310027, P. R. China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Qin
authors.forename: Yuan
authors.initials: Y
authors.lastname: Niu
authors.forename: Renyang
authors.initials: R
authors.lastname: Meng
authors.forename: Xing
authors.initials: X
authors.lastname: Lin
authors.forename: Runchen
authors.initials: R
authors.lastname: Lai
authors.forename: Wei
authors.initials: W
authors.lastname: Fang
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Peng