Hyperspectral Probing of Exciton dynamics and Multiplication in PbSe Nanocrystals
1 Institute of Chemistry and the Farkas Center for Light Induced Processes, the Hebrew University, Jerusalem 91904, Israel.
2 Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Height time hyperspectral near IR probing providing broad-band coverage is employed on PbSe nanocrystals, uncovering spectral evolution following high energy photo-excitation due to hot exciton relaxation and recombination. Separation of single, double and triple exciton state contributions to these spectra is demonstrated, and the mechanisms underlying the course of spectral evolution are investigated. In addition no sign of MEG was detected in this sample up to a photon energy 3.7 times that of the band gap.
© Owned by the authors, published by EDP Sciences, 2013
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