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Optical Studies of Znse Nanocrystals In Potassium Borosilicate Glass Matrices

Published online by Cambridge University Press:  10 February 2011

Christine A. Smith ,
Subhash H. Risbud ,
Howard W. H. Lee  and
J. Diane Cooke
Christine A. Smith
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, csmith@ucdphy.ucdavis.edu
Subhash H. Risbud
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, csmith@ucdphy.ucdavis.edu
Howard W. H. Lee
Affiliation:
Photonics Group, Lawrence Livermore National Laboratory, Livermore, CA 94550, hwhlee@llnl.gov
J. Diane Cooke
Affiliation:
Photonics Group, Lawrence Livermore National Laboratory, Livermore, CA 94550, hwhlee@llnl.gov
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Abstract

We have prepared ZnSe nanocrystals embedded in potassium borosilicate glass matrices in concentrations up to 14 wt%. The optical and electronic properties of these nanocrystals as a function of the fabrication process were investigated with High Resolution Transmission Electron Microscopy (HRTEM) and various optical techniques including absorption, photoluminescence, and excitation spectroscopy, and photoluminescence lifetime measurements. HRTEM confirms the presence of nanocrystals and indicates an average diameter size of 50 Å. The majority of the photoluminescence extends throughout the visible and is highly red-shifted from the absorptionedge, indicating emission from trap states such as Se vacancies. Contributions from the ZnSe nanocrystals as well as the borosilicate glass matrix are also observed. Exponential and biexponential photoluminescence decays are observed with decay times ranging from a few nanoseconds to a few hundred nanoseconds. The significance of these results to the optical and electronic properties of the ZnSe nanocrystals and their relevance as luminescent materials for light emitting applications will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 424: Symposium H – Flat Panel Display Materials II , 1996 , 501
Copyright
Copyright © Materials Research Society 1997

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