Exciton-Exciton Interaction and Optical Gain in Colloidal CdSe/CdS Dot/Rod Nanocrystals

Michele Saba; Stefan Minniberger; Francesco Quochi; Juergen Roither; Marco Marceddu; Agnieszka Gocalinska; Maksym V Kovalenko; Dmitri V Talapin; Wolfgang Heiss; Andrea Mura; Giovanni Bongiovanni

doi:10.1002/adma.200901482

Exciton-Exciton Interaction and Optical Gain in Colloidal CdSe/CdS Dot/Rod Nanocrystals

Adv Mater. 2009 Dec 28;21(48):4942-4946. doi: 10.1002/adma.200901482. Epub 2009 Aug 31.

Affiliations

¹ Dipartimento di Fisica and SLACS-CNR/INFM, Università di Cagliari 09042 Monserrato (Italy).
² Institute of Semiconductor and Solid State Physics Johannes Kepler University Altenbergerstr. 6g, 4040 Linz (Austria).
³ Department of Chemistry, The University of Chicago Chicago, IL 60637 (USA).

PMID: 25376736
DOI: 10.1002/adma.200901482

Abstract

Exciton-exciton interaction in dot/rod CdSe/CdS nanocrystals has proved to be very sensitive to the shape of nanocrystals, due to the unique band alignment between CdSe and CdS. Repulsive exciton-exciton interaction is demonstrated, which makes CdSe/CdS dot/rods promising gain media for solution-processable lasers, with projected pump threshold densities below 1 kW cm(-2) for continuous wave lasing.

Keywords: colloidal nanocrystals; optical nonlinearities; ultrafast spectroscopy.