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Up-Conversion Luminescence in Colloidal CdTe Nanocrystals

Published online by Cambridge University Press:  11 February 2011

S. A. Filonovich
Affiliation:
Departamento de Fisica Universidade do Minho, 4710–057 Braga, Portugal
M. J. M. Gomes
Affiliation:
Departamento de Fisica Universidade do Minho, 4710–057 Braga, Portugal
Yu. P. Rakovich
Affiliation:
Physics Department, Trinity College, Dublin 2, Ireland
J. F. Donegan
Affiliation:
Physics Department, Trinity College, Dublin 2, Ireland
D. V. Talapin
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
N. P. Gaponik
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
A. L. Rogach
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
A. Eychmüller
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
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Abstract

We report on the efficient photoluminescence up-conversion in colloidally synthesized CdTe nanocrystals. We demonstrate that the efficiency of photon energy up-conversion and magnitude of spectral shift can be controlled: (i) by the size of the nanocrystals; (ii) by the temperature dependence of the excited state absorption coefficient; (iii) by the dependence on excitation intensity. From the analysis of the experimental data we can suggest that intrinsic gap states are involved as intermediate states in the photoluminescence up-conversion rather than nonlinear two-photon absorption or Auger processes.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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Up-Conversion Luminescence in Colloidal CdTe Nanocrystals
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