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Exciton Nonlinearities and Optical Gain in Colloidal CdSe/CdS Dot/rod Nanocrystals

Published online by Cambridge University Press:  31 January 2011

Michele Saba
Affiliation:
michele.saba@dsf.unica.it, Università di Cagliari, Dipartimento di Fisica, Monserrato, Italy
Marco Marceddu
Affiliation:
marco.marceddu@dsf.unica.it, Università di Cagliari, Dipartimento di Fisica, Monserrato, Italy
Francesco Quochi
Affiliation:
francesco.quochi@dsf.unica.it, Università di Cagliari, Dipartimento di Fisica, Monserrato, Italy
Stefan Minniberger
Affiliation:
stefan.minniberger@gmx.at, Johannes Keppler Universität Linz, Institute of Semiconductor and Solid State Physics, Linz, Austria
Jürgen Roither
Affiliation:
juergen.roither@jku.at, United States
Agnieszka Gocalinska
Affiliation:
agnieszka.gocalinska@dsf.unica.it, Università di Cagliari, Dipartimento di Fisica, Monserrato, Italy
Maksym V Kovalenko
Affiliation:
mvkovalenko@uchicago.edu, The University of Chicago, Department of Chemistry, Chicago, Illinois, United States
Dmitri V Talapin
Affiliation:
dvtalapin@uchicago.edu, The University of Chicago, Department of Chemistry, Chicago, Illinois, United States
Wolfgang Heiss
Affiliation:
Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Austria
Andrea Mura
Affiliation:
andrea.mura@dsf.unica.it, Università di Cagliari, Dipartimento di Fisica, Monserrato, Italy
Giovanni Bongiovanni
Affiliation:
giovanni.bongiovanni@dsf.unica.it, Università di Cagliari, Dipartimento di Fisica, Monserrato, Italy
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Abstract

We characterized the optical nonlinearities of CdSe nanocrystals surrounded by rod-like CdS shells with ultrafast measurements of time-resolved photoluminescence. We measured the exciton-exciton interaction to be, depending on structure details, attractive or repulsive, by as much as 29 meV, due to the unique band alignment in the CdSe/CdS. This feature makes CdSe/CdS dot/rods promising gain media for solution-processable lasers, as it appears combined with 80% photoluminescence quantum yield, narrow size and shape distributions and the antenna effect of the CdS rod shell enhancing optical absorption by more than a factor 50 with respect to bare dots.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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