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Reversible Light-Induced On-Off Switching of Charge Traps in Quantum Dots Probe by Variable-Pulse-Rate Photoluminescence Spectroscopy.

Published online by Cambridge University Press:  22 April 2013

Mauro Aresti ,
Marco Marceddu ,
Michele Saba ,
Francesco Quochi ,
Jing Huang ,
Dmitri V. Talapin ,
Andrea Mura  and
Giovanni Bongiovanni
Mauro Aresti
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato (CA), Italy
Marco Marceddu
Affiliation:
Centro Grandi Strumenti d'Ateneo, Università di Cagliari, I-09042 Monserrato (CA), Italy
Michele Saba
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato (CA), Italy
Francesco Quochi
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato (CA), Italy
Jing Huang
Affiliation:
Department of Chemistry, The University of Chicago, Chicago, IL 60637
Dmitri V. Talapin
Affiliation:
Department of Chemistry, The University of Chicago, Chicago, IL 60637
Andrea Mura
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato (CA), Italy
Giovanni Bongiovanni
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato (CA), Italy
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Abstract

We devise an experiment, variable pulse rate photoluminescence, to control the accumulation of charges and the activation of charge traps in colloidal nanocrystals. The dynamics of these states is studied, with pulse repetition frequencies ranging from a few hundred hertz to the megahertz regime, by monitoring photoluminescence spectrograms with picosecond temporal resolution. We find that both photocharging and charge trapping contribute to photoluminescence quenching, and both processes can be reversibly induced by light.

Keywords

optical propertiesnanostructurecore/shell
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1509: Symposium CC – Optically Active Nanostructures , 2013 , mrsf12-1509-cc08-09
Copyright
Copyright © Materials Research Society 2013

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References

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