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The Enhancement of Band Edge Emission from ZnS/Zn(OH)2 Quantum Dots

Published online by Cambridge University Press:  17 March 2011

Hatim Mohamed El-Khair ,
Ling Xu ,
Xinfan Huang ,
Minghai Li ,
Xiaofeng Gu  and
Kunji Chen
Hatim Mohamed El-Khair
Affiliation:
National Laboratory of Solid State Microstructures and Department of physics, Nanjing University, Nanjing 210093, P. R., China
Ling Xu
Affiliation:
National Laboratory of Solid State Microstructures and Department of physics, Nanjing University, Nanjing 210093, P. R., China
Xinfan Huang
Affiliation:
National Laboratory of Solid State Microstructures and Department of physics, Nanjing University, Nanjing 210093, P. R., China
Minghai Li
Affiliation:
National Laboratory of Solid State Microstructures and Department of physics, Nanjing University, Nanjing 210093, P. R., China
Xiaofeng Gu
Affiliation:
National Laboratory of Solid State Microstructures and Department of physics, Nanjing University, Nanjing 210093, P. R., China
Kunji Chen
Affiliation:
National Laboratory of Solid State Microstructures and Department of physics, Nanjing University, Nanjing 210093, P. R., China
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Abstract

Wurtzite structure monodisperse ZnS quantum dots (QDs) of 1 to 5 nm diameter, synthesized by colloidal chemical method, were confirmed by transmission electron microscopy (TEM) images and electron diffraction (ED) patterns. Enhanced blue shifted band edge emission from Zn(OH)2 capped ZnS QDs with decreasing size has been observed, which indicates the role of inorganic surface passivation and hence supports the quantum size effect. Detectable far-red shifted emission from bare ZnS QDs has been observed when QDs precursors and stabilizer dispersed in solvents with different polarities. This emission is attributed to the surface trap states of different energies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 642: Symposium J – Semiconductor Quantum Dots II , 2000 , J3.18.1
Copyright
Copyright © Materials Research Society 2001

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References

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