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. 2013 Dec 24;4(1):19–45. doi: 10.3390/nano4010019

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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(a) A typical signal obtained from a UTA experiment showing the fractional transmittance change, ΔT/T, as a function of time delay between the pump and probe beams. R is the ratio between the peak amplitude, A, and the plateau amplitude, B, where enough time has passed that all bi-excitons have decayed, but before any significant decay of single-excitons; (b) R as a function of fractional transmittance change, ΔT/T, for InP QD excited at 2.6 times E_g. The line is a fit to Equation (2), data from Reference [24]; (c) Additional excitons produced, (QY − 1), as a function of hv/E_g for InAs NQD of different E_g. hv_th corresponds to the point where the rise in additional excitons begins, data from Reference [25]. Reproduced from Reference [26] by permission of the PCCP Owner Societies.