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Nature of the Green Luminescent Center in Zinc Oxide

Published online by Cambridge University Press:  10 February 2011

K. Vanheusden ,
W. L. Warren ,
C. H. Seager ,
D. R. Tallant ,
J. Caruso ,
M. J. Hampden-Smith  and
T. T. Kodas
K. Vanheusden
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1345
W. L. Warren
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1345
C. H. Seager
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1345
D. R. Tallant
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1345
J. Caruso
Affiliation:
Nanochem Research Inc., 11102 San Rafael NE, Albuquerque, New Mexico 87122
M. J. Hampden-Smith
Affiliation:
Nanochem Research Inc., 11102 San Rafael NE, Albuquerque, New Mexico 87122
T. T. Kodas
Affiliation:
Nanochem Research Inc., 11102 San Rafael NE, Albuquerque, New Mexico 87122
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Abstract

We apply a number of complementary characterization techniques including electron paramagnetic resonance, optical absorption, and photoluminescence spectroscopies to characterize a wide range of different ZnO phosphor powders. We generally observe a good correlation between the 510-nm green emission intensity and the density of paramagnetic isolated oxygen vacancies. In addition, both quantities are found to peak at a free-carrier concentration ne, of about 1.4 × 1018 cm-3. We also find that the green emission intensity can be strongly influenced by free-carrier depletion at the particle surface, especially for small particles and/or low doping. Our data suggest that the green PL in ZnO phosphors is due to the recombination of electrons in singly occupied oxygen vacancies with photoexcited holes in the valence band.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 424: Symposium H – Flat Panel Display Materials II , 1996 , 433
Copyright
Copyright © Materials Research Society 1997

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