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Up-Conversion Luminescence in Colloidal CdTe Nanocrystals

Published online by Cambridge University Press:  11 February 2011

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

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002, E13.12
Copyright
Copyright © Materials Research Society 2003

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References

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