Anti-stokes photoluminescence in II-VI colloidal nanocrystals

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yu P. Rakovich
  • S. A. Filonovich
  • M. J M Gomes
  • J. F. Donegan
  • D. V. Talapin
  • A. Eychmüller

Detail(s)

Original languageEnglish
Pages (from-to)449-452
Journal / PublicationPhysica Status Solidi (B) Basic Research
Volume229
Issue number1
Publication statusPublished - 2002
Externally publishedYes

Abstract

For the first time highly efficient photon energy up-conversion (anti-Stokes photoluminescence) has been observed in colloids of CdTe nanocrystals (NCs) and CdSe NCs covered by ZnS shell. The maximum magnitude of the up-converted blue shift ΔEUCmax = 335 meV was obtained for CdSe/ZnS NCs under excitation by a low-power He-Ne laser. The maximum efficiency for energy conversion was estimated to be about ηmax = 2.7 × 10-2 % at room temperature. The intensity of the anti-Stokes photoluminescence increases with temperature and shows a linear dependence on the excitation intensity. We suggest that subgap surface states are involved as intermediate states in the up-conversion process rather than nonlinear two-photon absorption or Auger processes.

Citation Format(s)

Anti-stokes photoluminescence in II-VI colloidal nanocrystals. / Rakovich, Yu P.; Filonovich, S. A.; Gomes, M. J M et al.
In: Physica Status Solidi (B) Basic Research, Vol. 229, No. 1, 2002, p. 449-452.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review