Single nanocrystal spectroscopy approaches for investigation of emission efficiency and recombination dynamics of multi-excitons

Benjamin D. Mangum; Young-Shin Park; Yagnaseni Ghosh; Jennifer A. Hollingsworth; Han Htoon

doi:10.1117/12.2016074

3 June 2013 Single nanocrystal spectroscopy approaches for investigation of emission efficiency and recombination dynamics of multi-excitons

Benjamin D. Mangum, Young-Shin Park, Yagnaseni Ghosh, Jennifer A. Hollingsworth, Han Htoon

Author Affiliations +

Proceedings Volume 8727, Advanced Photon Counting Techniques VII; 87270S (2013) https://doi.org/10.1117/12.2016074
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

Understanding and controlling the emission efficiency and recombination dynamics of bi-excitonic states (i.e. Q_BX and τ_BX) in semiconductor nanocrystal quantum dots (NQDs) holds the key to many novel technological applications including optical amplification, entangled photon-pair generation and carrier multiplication. Here we present novel single particle spectroscopy approaches capable of measuring these parameter directly. Our approaches are based on second order photon correlation spectroscopy (g⁽²⁾ (τ)) and can also be applied to small clusters of NQDs to determine the number of NQDs in a cluster together with average value of Q_BX and τ_BX. Specifically, first we demonstrate that the ratio of the areas of center and side peaks of the g⁽²⁾ (τ) function of the spectrally integrated PL of a single NQD provide a precise measure of the ratio of the quantum yield of single and bi-exciton states. Next, we present a time gated photon correlation spectroscopy approach that allows separation of the effects of multi-exciton emission and NQD clustering in g(2) measurements. Finally, we present how the emission of bi-excitons can be separated in g⁽²⁾ (τ) measurements and extract decay dynamics of bi-excitons without any ambiguity.

Citation Download Citation

Benjamin D. Mangum, Young-Shin Park, Yagnaseni Ghosh, Jennifer A. Hollingsworth, and Han Htoon "Single nanocrystal spectroscopy approaches for investigation of emission efficiency and recombination dynamics of multi-excitons", Proc. SPIE 8727, Advanced Photon Counting Techniques VII, 87270S (3 June 2013); https://doi.org/10.1117/12.2016074

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