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Cerium-Doped Orthophosphate Scintillators

Published online by Cambridge University Press:  21 February 2011

A. J. Wojtowicz ,
A. Lempicki ,
D. Wisniewski  and
L. A. Boatner
A. J. Wojtowicz
Affiliation:
Chemistry Dept., Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA ALEM Associates, 303A Commonwealth Ave., Boston, MA 02115, USA Institute of Physics, N. Copernicus University, Grudziadzka 5, 87-100 Torun, Poland
A. Lempicki
Affiliation:
Chemistry Dept., Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA ALEM Associates, 303A Commonwealth Ave., Boston, MA 02115, USA
D. Wisniewski
Affiliation:
Chemistry Dept., Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA ALEM Associates, 303A Commonwealth Ave., Boston, MA 02115, USA Institute of Physics, N. Copernicus University, Grudziadzka 5, 87-100 Torun, Poland
L. A. Boatner
Affiliation:
Solid State Div., Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 3783 1, USA
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Abstract

Cerium-doped lutetium orthophosphate (LuPO4:Ce) is one of the most promising new scintillator materials. In this paper we report on the effects of total or partial replacement of Lu by Yb. When not doped with Ce, crystals of YbxLu1-xPO4 scintillate rather poorly, the emission being due to the Yb charge transfer transition. Activation with Ce reduces the light output from Yb even further, while correspondingly the addition of Yb to LuPO4:Ce also degrades that material's scintillation performance. We suggest that the nonradiative decay of the (Yb2+-Ce4+) charge transfer state is responsible for the mutual quenching of these ions. The differences in performance of LuPO4:Yb and LuPO4:Ce indicate that energy transfer mechanisms ordinarily associated with materials containing molecular anionic groups may not be quite sufficient to explain the results. Suggestions are presented that under γ-excitation the lattice-to-ion energy transfer in orthophosphates is accomplished by sequential capture of charge carriers rather than the more conventional mechanism of exciton hopping between molecular groups.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 348 , 1994 , 123
Copyright
Copyright © Materials Research Society 1994

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References

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