Disentangling the effects of clustering and multi-exciton emission in second-order photon correlation experiments
- 18 March 2013
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 21 (6), 7419-7426
- https://doi.org/10.1364/oe.21.007419
Abstract
In single particle spectroscopy, the degree of observed fluorescence anti-bunching in a second-order cross correlation experiment is indicative of its bi-exciton quantum yield and whether or not a particle is well isolated. Advances in quantum dot synthesis have produced single particles with bi-exciton quantum yields approaching unity. Consequently, this creates uncertainty as to whether a particle has a high bi-exciton quantum yield or if it exists as a cluster. We report on a time-gated anti-bunching technique capable of determining the relative contributions of both multi-exciton emission and clustering effects. In this way, we can now unambiguously determine if a particle is single. Additionally, this time-gated anti-bunching approach provides an accurate way for the determination of bi-exciton lifetime with minimal contribution from higher order multi-exciton states.This publication has 33 references indexed in Scilit:
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