Mechanisms of VUV Damage in BaMgAl10O17:Eu2+

Document Type

Article

Department or Administrative Unit

Chemistry

Publication Date

11-17-2004

Abstract

We have studied vacuum ultraviolet (VUV)-induced damage processes in BaMgAl10O17:Eu2+ using a unique accelerated life-testing device. Emission, excitation, and reflectance spectra of doped and undoped samples before and after VUV damage reveal two independent mechanisms of degradation. The observed color shift in damaged materials is due to the migration of Eu2+ ions to metastable sites in the lattice. The observed loss of brightness is due in part to the formation of color centers in the spinel layer that act as energy traps and also absorb the exciton emission of the host lattice, thus interrupting the transfer of energy from the host to the activator. Several modes of energy transfer to Eu2+ are available depending on the excitation energy.

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This article was originally published in Chemistry of Materials. The full-text article from the publisher can be found here.

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Journal

Chemistry of Materials

Rights

© 2004 American Chemical Society

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