Continuous-wave pumping of multiexciton bands in the photoluminescence spectrum of a single CdTe-CdSe core-shell colloidal quantum dot

Ruth Osovsky, Dima Cheskis, Viki Kloper, Aldona Sashchiuk, Martin Kroner, Efrat Lifshitz

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110 Scopus citations

Abstract

Single-exciton, biexciton, triexciton, and quadraexciton bands were resolved in the microphotoluminescence spectrum of a single CdTe/CdSe core-shell colloidal quantum dot, revealing nearly blinking-free behavior. Multiexcitons were generated by a sequential filling of electronic shells with the increase of a continuous-wave excitation power, and their probability was evaluated under steady-state conditions. A partial carriers' delocalization was determined at the core-shell interface, and an exciton binding energy was estimated by a second-order perturbation theory.

Original languageEnglish
Article number197401
JournalPhysical Review Letters
Volume102
Issue number19
DOIs
StatePublished - 11 May 2009
Externally publishedYes

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