Anti-stokes photoluminescence in II-VI colloidal nanocrystals

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

doi:10.1002/1521-3951(200201)229:1<449::AID-PSSB449>3.0.CO;2-4

Anti-stokes photoluminescence in II-VI colloidal nanocrystals

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

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

77 Citations (Scopus)

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 ΔE_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 η_max = 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.

Original language	English
Pages (from-to)	449-452
Journal	Physica Status Solidi (B) Basic Research
Volume	229
Issue number	1
DOIs	https://doi.org/10.1002/1521-3951(200201)229:1<449::AID-PSSB449>3.0.CO;2-4
Publication status	Published - 2002
Externally published	Yes

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title = "Anti-stokes photoluminescence in II-VI colloidal nanocrystals",

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.",

author = "Rakovich, {Yu P.} and Filonovich, {S. A.} and Gomes, {M. J M} and Donegan, {J. F.} and Talapin, {D. V.} and Rogach, {A. L.} and A. Eychm{\"u}ller",

year = "2002",

doi = "10.1002/1521-3951(200201)229:1<449::AID-PSSB449>3.0.CO;2-4",

language = "English",

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journal = "Physica Status Solidi (B) Basic Research",

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TY - JOUR

T1 - Anti-stokes photoluminescence in II-VI colloidal nanocrystals

AU - Rakovich, Yu P.

AU - Filonovich, S. A.

AU - Gomes, M. J M

AU - Donegan, J. F.

AU - Talapin, D. V.

AU - Rogach, A. L.

AU - Eychmüller, A.

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

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U2 - 10.1002/1521-3951(200201)229:1<449::AID-PSSB449>3.0.CO;2-4

DO - 10.1002/1521-3951(200201)229:1<449::AID-PSSB449>3.0.CO;2-4

M3 - RGC 21 - Publication in refereed journal

SN - 0370-1972

VL - 229

SP - 449

EP - 452

JO - Physica Status Solidi (B) Basic Research

JF - Physica Status Solidi (B) Basic Research

IS - 1

ER -

Anti-stokes photoluminescence in II-VI colloidal nanocrystals

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