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.

Minotto, A., Todescato, F., Fortunati, I., Signorini, R., Jasieniak, J., Bozio, R. (2014). Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots. JOURNAL OF PHYSICAL CHEMISTRY. C, 118(41), 24117-24126 [10.1021/jp506778n].

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

Minotto, A;
2014

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.
Articolo in rivista - Articolo scientifico
AMPLIFIED SPONTANEOUS EMISSION; SEMICONDUCTOR NANOCRYSTALS; CORE/SHELL NANOCRYSTALS; CDSE NANOCRYSTALS; OPTICAL GAIN; AUGER RECOMBINATION; STIMULATED-EMISSION; RAMAN-SPECTROSCOPY; IN-VIVO; YIELD
English
2014
118
41
24117
24126
none
Minotto, A., Todescato, F., Fortunati, I., Signorini, R., Jasieniak, J., Bozio, R. (2014). Role of core-shell interfaces on exciton recombination in CdSe-CdxZn1-xS quantum dots. JOURNAL OF PHYSICAL CHEMISTRY. C, 118(41), 24117-24126 [10.1021/jp506778n].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/340891
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