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Observation of the Morphology of ZnO:Al Nanocoating by Pulsed Laser Deposition on ZnS:Ag Phosphor for Degradation Repression

Published online by Cambridge University Press:  11 February 2011

Sanshiro Nagare ,
Michael Ollinger ,
Rajiv Singh  and
Mamoru Senna
Sanshiro Nagare
Affiliation:
Nara Machinery Co., Ltd, 2–5–7 Jonan-jima, Ohta-ku, Tokyo, 143–0002, Japan
Michael Ollinger
Affiliation:
University of Florida, Department of Materials Science and Engineering, Gainesville, Florida, 32611, U.S.A.
Rajiv Singh
Affiliation:
University of Florida, Department of Materials Science and Engineering, Gainesville, Florida, 32611, U.S.A.
Mamoru Senna
Affiliation:
Keio University, Faculty of Science and Technology, 3–14–1 Hiyoshi, Kohoku-ku, Yokohama, 223–8522, Japan
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Abstract

Degradation due to electron beam irradiation is a significant problem for ZnS based phosphors, particularly for flat panel displays. In this study, ZnS:Ag phosphor particles were coated by nanoparticles of ZnO:Al by pulsed laser deposition (PLD), to suppress the cathodoluminescence (CL) degradation process under electron bombardment at 15 k V. The pressure of the vacuum chamber and the deposition time were changed to control the morphology of the coating, i.e. thickness, continuity, and uniformity. CL degradation of the phosphors was slowed down for all cases by the nanocoating. The relationship between the CL degradation and the morphology of the coating material was examined by an SEM combined with a simultaneous CL measurement device. Degradation mechanisms were elucidated in terms of the morphology of the coating material and the change in the surface atomic species during irradiation of the electron beam.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 738: Symposium G – Spatially Resolved Characterization of Local Phenomena in Materials and Nanostructures , 2002 , G7.36
Copyright
Copyright © Materials Research Society 2003

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References

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