Charge-tunable optical properties in colloidal semiconductor nanocrystals

Moonsub Shim, Congjun Wang, Philippe Guyot-Sionnest

Research output: Contribution to journalArticlepeer-review


The optical properties of colloidal semiconductor nanocrystals are found to be extremely sensitive to excess electrons. Electrons in the lowest quantum-confined state of the conduction band of CdSe and (CdSe)ZnS nanocrystals quench photoluminescence by several orders of magnitude, at the same time, leading to a strong, mid-infrared intraband absorption and bleaching of the interband exciton transitions. Surface electrons are also efficient in quenching photoluminescence, but a passivating layer of wider band gap ZnS can reduce their influence. The results suggest that single-electron switching of photoluminescence may be feasible with improved core/shell structures of semiconductor nanocrystals.

Original languageEnglish (US)
Pages (from-to)2369-2373
Number of pages5
JournalJournal of Physical Chemistry B
Issue number12
StatePublished - Mar 29 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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