Anti-Stokes photoluminescence in II-VI colloidal nanocrystals

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Rakovich, YP (Author) Other; Filonovich, SA (Author) Other; Gomes, MJM (Author) Other; Donegan, JF (Author) Other; Talapin, DV (Author) Other; Rogach, AL (Author) Other; Eychmuller, A (Author) Other

Journal

Title: Physica Status Solidi (B): Basic Research

Vol. 229

Pages: 449-452

ISSN: 0370-1972

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 58 Citations

Scopus - 71 Citations

Other information

Authenticus ID: P-000-RRK

DOI: 10.1002/1521-3951(200201)229:1<449::aid-pssb449>3.0.co;2-4

Abstract (EN): 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 DeltaE(UC)(max) = 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 eta(max) = 2.7 x 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4