The shell thickness and surface passivation dependence of fluorescence decay kinetics in CdSe/ZnS core-shell and CdSe core colloidal quantum dots

Femtoseconds, ultrafast, time-resolved, fluorescence upconversion spectroscopy was utilized to investigate the photo-induced emission decay dynamics of CdSe and CdSe/ZnS colloidal quantum dots whose surfaces were stabilized with octadecyl amine (ODA). The studies focused on understanding the influen...

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Bibliographic Details
Published in:Journal of luminescence 2017-12, Vol.192, p.860-866
Main Authors: Rajapaksha, Ruwini D., Ranasinghe, Mahinda I.
Format: Article
Language:English
Subjects:
CdSe
CdSe/ZnS
Core-shell quantum dots
Fluorescence lifetime
Time-resolved fluorescence upconversion spectroscopy
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Summary:Femtoseconds, ultrafast, time-resolved, fluorescence upconversion spectroscopy was utilized to investigate the photo-induced emission decay dynamics of CdSe and CdSe/ZnS colloidal quantum dots whose surfaces were stabilized with octadecyl amine (ODA). The studies focused on understanding the influence of the surface stabilizing group on the fluorescence decay dynamics of CdSe and CdSe/ZnS and the effect of shell thickness on the photo-physical properties of core-shell quantum dots. The Core-shell materials showed excellent photostability, longer rise times, and lengthy decay times. [Display omitted]
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2017.08.024