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Synthesis and Characterization of Highly Luminescent (CdSe)ZnS Quantum Dots

Published online by Cambridge University Press:  15 February 2011

F. V. Mikulec ,
B. O. Dabbousi ,
J. Rodriguez-Viejo ,
J. R. Heine ,
H. Mattoussi ,
K. F. Jensen  and
M. G. Bawendi
F. V. Mikulec
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, mgb@mit.edu
B. O. Dabbousi
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, mgb@mit.edu
J. Rodriguez-Viejo
Affiliation:
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
J. R. Heine
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
H. Mattoussi
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
K. F. Jensen
Affiliation:
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
M. G. Bawendi
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, mgb@mit.edu
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Abstract

We report the synthesis of a series of nearly monodisperse ZnS-overcoated CdSe quantum dots whose room temperature photoluminescence quantum yield approaches 50%. This spectrally narrow (FWHM < 40nm) band edge luminescence spans the visible region from blue to red light. We use a two-step synthesis based on the high temperature decomposition of organometallic precursors in a coordinating solvent. We characterize our composite quantum dots using optical spectroscopies, wavelength dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy, high resolution transmission electron microscopy, small angle x-ray scattering, and wide angle x-ray diffraction. The data indicate that samples displaying the highest quantum yield are those which have just achieved a closed shell of ZnS encapsulating the CdSe core. As more ZnS is added, the quantum yield decreases somewhat, possibly due to the many defects present in larger ZnS shells.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 359
Copyright
Copyright © Materials Research Society 1997

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References

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