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

SABA, MICHELE;Minniberger S.;QUOCHI, FRANCESCO;Roither J.;MARCEDDU, MARCO;Gocalinska A.;Kovalenko M. V.;Talapin D. V.;Heiss W.;MURA, ANTONIO ANDREA;BONGIOVANNI, GIOVANNI LUIGI CARLO

2009-01-01

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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.