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Effect of Doping on the Structural and Optical Properties of Microwave-Assisted Synthesis of ZnSe@ZnS Core-Shell Quantum Dots

Published online by Cambridge University Press:  31 January 2011

Sonia J Bailon-Ruiz ,
Oscar Perales-Perez ,
Surinder P Singh  and
Paul M Voyles
Sonia J Bailon-Ruiz
Affiliation:
[email protected], University of Puerto Rico, Chemistry, Mayaguez, Puerto Rico
Oscar Perales-Perez
Affiliation:
[email protected], University of Puerto Rico, Department of Engineering Science & Materials, Mayaguez, Puerto Rico
Surinder P Singh
Affiliation:
[email protected], University of Puerto Rico, Department of Engineering Science & Materials, Mayaguez, Puerto Rico
Paul M Voyles
Affiliation:
[email protected], University of Wisconsin at Madison, Materials Science and Engineering, Madison, Wisconsin, United States
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Abstract

Pure and Cu-doped quantum dots of ZnSe@ZnS were synthesized in aqueous phase using microwave irradiation at 140 °C. X-ray diffraction analyses suggested the development of a ZnSe-ZnS structure. UV-vis measurements evidenced that the presence of Cu species in quantum dots caused the blue shift of exciton peaks with respect to pure, i.e. non doped ones. Photoluminescence spectra of quantum dots synthesized at Zn/Cu mole ratios of 1/0.001 and 1/0.005 exhibited a very strong emission peak centered on ˜ 515 nm. On the contrary, a weak emission peak was observed at 412 nm in pure ZnSe@ZnS quantum dots. The observed emission at 515 nm was attributed to the internal doping of Cu species, which should have induced d-d transitions in the host lattice. Quenching of the luminescence at 515 nm was observed for nominal Cu concentrations above 0.005 mM.

Keywords

dopantoptical propertiesnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1207: Symposium N – Colloidal Nanoparticles for Electronic Applications — Light Emission, Detection, Photovoltaics and Transport , 2009 , 1207-N10-61
Copyright
Copyright © Materials Research Society 2010

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