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

doi:10.1021/jp506778n

Role of core-shell interfaces on exciton recombination in CdSe-Cd_xZn_1-xS quantum dots

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

Research output: Contribution to journal › Article › Research › peer-review

37 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 language	English
Pages (from-to)	24117-24126
Number of pages	10
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	41
DOIs	https://doi.org/10.1021/jp506778n
Publication status	Published - 16 Oct 2014
Externally published	Yes

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10.1021/jp506778n

Cite this

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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.",

author = "Alessandro Minotto and Francesco Todescato and Ilaria Fortunati and Raffaella Signorini and Jasieniak, {Jacek J.} and Renato Bozio",

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language = "English",

volume = "118",

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journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

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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

Y1 - 2014/10/16

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.

U2 - 10.1021/jp506778n

DO - 10.1021/jp506778n

M3 - Article

SN - 1932-7447

VL - 118

SP - 24117

EP - 24126

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

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