Conductivity-dependent cathodoluminescence in BaTiO3, SrTiO3 and TiO2 |
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Authors: | H. Ihrig J. H. T. Hengst M. Klerk |
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Affiliation: | (1) Philips GmbH Forschungslaboratorium, Weißhausstraße, Postfach 1980, D-5100 Aachen, Federal Republic of Germany;(2) Philips Research Laboratory, Eindhoven, The Netherlands |
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Abstract: | It is reported that similar cathodoluminescence spectra are excited by an electron beam striking BaTiO3, SrTiO3 and TiO2 ceramics at room temperature. The energy location of the luminescence bands does not depend on various doping or reduction treatments. The luminescence intensity increases with the electron beam current as well as with the conduction electron density. The luminescence is interpreted as a fundamental transition of local character in the TiO6 octahedron; the conduction electrons localized at the Ti sites in polaron states recombine with the 0–2p valence electron defects. The shape and energy location of the luminescence spectra are qualitatively in accordance with an explanation in terms of a configuration coordinate model. |
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