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Suppression of BaF2 Slow Component of X-RAY Luminescence in Non-Stoichiometric Bao.9R0.1F2.1 Crystals (R=Rare Earth Element)

Published online by Cambridge University Press:  21 February 2011

B.P. Sobolev ,
E.A. Krivandina ,
S.E. Derenzo ,
W.W. Moses  and
A.C. West
B.P. Sobolev
Affiliation:
Institute of Crystallography, Leninskii pr. 59, Moscow 117333, Russia
E.A. Krivandina
Affiliation:
Institute of Crystallography, Leninskii pr. 59, Moscow 117333, Russia
S.E. Derenzo
Affiliation:
Center for Functional Imaging, Lawrence Berkeley Laboratory, Berkeley, CA 94720
W.W. Moses
Affiliation:
Center for Functional Imaging, Lawrence Berkeley Laboratory, Berkeley, CA 94720
A.C. West
Affiliation:
Center for Functional Imaging, Lawrence Berkeley Laboratory, Berkeley, CA 94720
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Abstract

A series of BaF2 crystals doped with 10% mole fraction of each rare earth element has been grown, and the effect of these dopants on the slow luminescence (due to anionic self trapped excitons) and fast luminescence (due to core-valence transitions) has been studied. While significant suppression was observed for both components, the best dopants for suppressing the slow component of barium fluoride (up to 25-50%) while maintaining the luminosity of the fast component are La, Y, and Lu. The luminescence of Ba0.9Eu0.1F2.1 is almost entirely fast (>90%), but with low light output. For two rare earth dopants (La and Gd), the effect of slow and fast component suppression was studied as a function of concentration (Ba1-xRxF2+x with x≦0.5 for R=La and x≦0.3 for R=Gd). The suppression is non-linear with dopant concentration, with the relative degree of slow component suppression correlated with the melting point of these samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 348 , 1994 , 277
Copyright
Copyright © Materials Research Society 1994

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References

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