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

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.

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Keywords

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

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