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New perspective in degradation mechanism of SrTiO3:Pr,Al,Ga phosphors

Published online by Cambridge University Press:  03 March 2011

Jin Young Kim ,
Yong Chan You ,
Jong Hyuk Kang ,
Duk Young Jeon  and
Jörg Weber
Jin Young Kim*
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yusung-gu, Daejeon 305-701, Korea
Yong Chan You
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yusung-gu, Daejeon 305-701, Korea
Jong Hyuk Kang
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yusung-gu, Daejeon 305-701, Korea
Duk Young Jeon
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yusung-gu, Daejeon 305-701, Korea
Jörg Weber
Affiliation:
Institute for Applied Physics-Semiconductor Physics, TUI-Dresden, Dresden D-01062, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Under prolonged electron-beam exposure, perovskite-structured SrTiO3:Pr,Al,Ga (STO) phosphor can be easily reduced due to oxygen loss. In particular, it is well known that dissociative H2O molecules are well adsorbed on reduced STO surfaces. The hydroxyl species produced by such dissociative adsorption of H2O strongly decompose organic compounds chemisorbed on the surface from vacuum ambient used in display devices into carbon species due to the photocatalytic properties of STO. Consequently, it is very likely that this mechanism attributes to the larger amounts of carbon adsorption by electron-stimulated chemical reactions on the STO phosphor surface than other phosphors.

Keywords

Surface reactionX-ray photoelectron spectroscopy (XPS)Luminescence
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 9 , September 2004 , pp. 2694 - 2698
Copyright
Copyright © Materials Research Society 2004

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