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Energy Localization and Decay in Highly Ionic Crystals

Published online by Cambridge University Press:  21 February 2011

R. T. Williams
Affiliation:
Wake Forest University, Department of Physics, Winston-Salem, NC 27109
E. D. Thoma
Affiliation:
Wake Forest University, Department of Physics, Winston-Salem, NC 27109
P. H. Bunton
Affiliation:
Austin Peay State University, Department of Physics, Clarksville, TN 37044
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Abstract

Luminescence from localized states in pure wide-gap crystals is examined from the perspective of modern fast scintillator requirements. Recent advances in the understanding of self-trapped excitons are summarized with regard to excited-state configurations, spectra, and luminescence efficiency. As an example, the fast luminescence of partially quenched type I STEs in RbI offers tuneable-lifetime subnanosecond pulses which could be useful for timing applications. The possible role of hole localization in cross luminescence is discussed. Stokes-shifted luminescence in some pure rare-earth fluoride crystals probably originates from self-trapped excitons of forms to be discussed.

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Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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