Transient fluorescence of the off state in blinking CdSe/CdS/ZnS semiconductor nanocrystals is not governed by auger recombination

Shamir Rosen, Osip Schwartz, Dan Oron

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Abstract

The observed intermittent light emission from colloidal semiconductor nanocrystals has long been associated with Auger recombination assisted quenching. We test this view by observing transient emission dynamics of CdSe/CdS/ZnS semiconductor nanocrystals using time-resolved photon counting. The size and intensity dependence of the observed decay dynamics seem inconsistent with those expected from Auger processes. Rather, the data suggest that in the "off" state the quantum dot cycles in a three-step process: photoexcitation, rapid trapping, and subsequent slow nonradiative decay.

Original languageEnglish
Article number157404
JournalPhysical review letters
Volume104
Issue number15
DOIs
Publication statusPublished - Apr 16 2010

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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