Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots

Alessandro Minotto, Francesco Todescato, Ilaria Fortunati, Raffaella Signorini, Jacek J. Jasieniak, Renato Bozio

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28 Citations (Scopus)

Abstract

The shell thickness and composition of CdSe-CdxZn1-xS core-shell quantum dots (QDs) are defining parameters for the efficiency of such materials as light emitters. In this work we present a detailed study into the optical absorption and fluorescence properties of CdSe-CdS, CdSe-Cd0.5Zn0.5S, and CdSe-ZnS QDs as a function of shell thickness. Moreover, the single-exciton recombination dynamics of these systems are analyzed by means of a time-correlated single-photon counting technique and directly related to the specific core-shell interfaces of the various QDs studied using a phenomenological kinetic model. The findings from this model highlight the strong role of the core-shell interface on both steady state photoluminescence and exciton recombination dynamics in these systems.
Original languageEnglish
Pages (from-to)24117-24126
Number of pages10
JournalJournal of Physical Chemistry C
Volume118
Issue number41
DOIs
Publication statusPublished - 16 Oct 2014
Externally publishedYes

Cite this

Minotto, Alessandro ; Todescato, Francesco ; Fortunati, Ilaria ; Signorini, Raffaella ; Jasieniak, Jacek J. ; Bozio, Renato. / Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots. In: Journal of Physical Chemistry C. 2014 ; Vol. 118, No. 41. pp. 24117-24126.
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title = "Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots",
abstract = "The shell thickness and composition of CdSe-CdxZn1-xS core-shell quantum dots (QDs) are defining parameters for the efficiency of such materials as light emitters. In this work we present a detailed study into the optical absorption and fluorescence properties of CdSe-CdS, CdSe-Cd0.5Zn0.5S, and CdSe-ZnS QDs as a function of shell thickness. Moreover, the single-exciton recombination dynamics of these systems are analyzed by means of a time-correlated single-photon counting technique and directly related to the specific core-shell interfaces of the various QDs studied using a phenomenological kinetic model. The findings from this model highlight the strong role of the core-shell interface on both steady state photoluminescence and exciton recombination dynamics in these systems.",
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Minotto, A, Todescato, F, Fortunati, I, Signorini, R, Jasieniak, JJ & Bozio, R 2014, 'Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots', Journal of Physical Chemistry C, vol. 118, no. 41, pp. 24117-24126. https://doi.org/10.1021/jp506778n

Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots. / Minotto, Alessandro; Todescato, Francesco; Fortunati, Ilaria; Signorini, Raffaella; Jasieniak, Jacek J.; Bozio, Renato.

In: Journal of Physical Chemistry C, Vol. 118, No. 41, 16.10.2014, p. 24117-24126.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots

AU - Minotto, Alessandro

AU - Todescato, Francesco

AU - Fortunati, Ilaria

AU - Signorini, Raffaella

AU - Jasieniak, Jacek J.

AU - Bozio, Renato

PY - 2014/10/16

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N2 - The shell thickness and composition of CdSe-CdxZn1-xS core-shell quantum dots (QDs) are defining parameters for the efficiency of such materials as light emitters. In this work we present a detailed study into the optical absorption and fluorescence properties of CdSe-CdS, CdSe-Cd0.5Zn0.5S, and CdSe-ZnS QDs as a function of shell thickness. Moreover, the single-exciton recombination dynamics of these systems are analyzed by means of a time-correlated single-photon counting technique and directly related to the specific core-shell interfaces of the various QDs studied using a phenomenological kinetic model. The findings from this model highlight the strong role of the core-shell interface on both steady state photoluminescence and exciton recombination dynamics in these systems.

AB - The shell thickness and composition of CdSe-CdxZn1-xS core-shell quantum dots (QDs) are defining parameters for the efficiency of such materials as light emitters. In this work we present a detailed study into the optical absorption and fluorescence properties of CdSe-CdS, CdSe-Cd0.5Zn0.5S, and CdSe-ZnS QDs as a function of shell thickness. Moreover, the single-exciton recombination dynamics of these systems are analyzed by means of a time-correlated single-photon counting technique and directly related to the specific core-shell interfaces of the various QDs studied using a phenomenological kinetic model. The findings from this model highlight the strong role of the core-shell interface on both steady state photoluminescence and exciton recombination dynamics in these systems.

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