Water-Based Route to Synthesis of High-Quality UV-Blue Photoluminescing ZnSe/ZnS Core/Shell Quantum Dots and their Physicochemical Characterization

Yong Ling Ding; Hua Dong Sun; Kang Ning Sun; Fu Tian Liu

doi:10.4028/www.scientific.net/KEM.680.553

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 680Water-Based Route to Synthesis of High-Quality...

Water-Based Route to Synthesis of High-Quality UV-Blue Photoluminescing ZnSe/ZnS Core/Shell Quantum Dots and their Physicochemical Characterization

Abstract:

Epitaxially overgrowing a semiconductor material with higher bandgap around the QDs has proven to be a crucial approach for improving the PL efficiency and stability of nanocrystals. In this paper, a ZnS shell was deposited around ZnSe nanocrystal cores via a noninjection approach in aqueous media. The deposition procedure conducted at 100°C in a reaction flask in the presence of the shell precursor compounds, together with the crude ZnSe nanocrystal cores and the thiol ligand glutathione. The influences of various experimental variables, including the reaction time, amount of thiourea, as well as pH value, on the growth rate and luminescent properties of the obtained core/shell nanocrystals have been systematically investigated. In comparison with the original ZnSe nanocrystals, the PL efficiency of the obtained ZnSe/ZnS core/shell nanostructures can be improved significantly with a QY up to 62.8%.

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Periodical:

Key Engineering Materials (Volume 680)

Pages:

553-557

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.680.553

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Online since:

February 2016

Authors:

Yong Ling Ding, Hua Dong Sun, Kang Ning Sun, Fu Tian Liu*

Keywords:

Epitaxially Overgrowing, PL Efficiency, Semiconductor Material, ZnSe/ZnS

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* - Corresponding Author

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