Scintillation mechanisms in rare earth orthophosphates

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In this Communication we present results of our studies on scintillation properties of rare earth orthophosphates. Despite of the PO{sub 4} group high frequency vibrations, which limit the conversion efficiency in orthophosphate lattices, some of them are very promising, as evidenced by the exceptionally good scintillation properties of LuPO{sub 4}:Ce. We have studied the following orthophosphate crystals: YbPO{sub 4}:Ce, YbPO{sub 4}, and Lu{sub x}Yb{sup 1-x}PO{sub 4}:Ce. Both Ce and Yb ions scintillate (through d-f transition and charge transfer state decay, respectively) but, unfortunately, they also show strong tendency toward mutual quenching. We propose that nonradiative Yb-Ce energy transfer and the ... continued below

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8 p.

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Wojtowicz, A.J.; Wisniewski, D. & Lempicki, A. December 31, 1994.

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In this Communication we present results of our studies on scintillation properties of rare earth orthophosphates. Despite of the PO{sub 4} group high frequency vibrations, which limit the conversion efficiency in orthophosphate lattices, some of them are very promising, as evidenced by the exceptionally good scintillation properties of LuPO{sub 4}:Ce. We have studied the following orthophosphate crystals: YbPO{sub 4}:Ce, YbPO{sub 4}, and Lu{sub x}Yb{sup 1-x}PO{sub 4}:Ce. Both Ce and Yb ions scintillate (through d-f transition and charge transfer state decay, respectively) but, unfortunately, they also show strong tendency toward mutual quenching. We propose that nonradiative Yb-Ce energy transfer and the nonradiative decay of the (Yb{sup 2+} + Ce{sup 4+}) charge transfer state are responsible for the observed effect. Therefore ytterbium does not provide cheaper substitute for the optically inactive RE ion (lutetium) in the orthophosphate lattice, on the contrary, it has to be carefully avoided whenever a Ce-activation is used.

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8 p.

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OSTI as DE96004560

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  • 7. Europhysical conference on defects in insulating materials, Lyon (France), 5-9 Jul 1994

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  • Other: DE96004560
  • Report No.: CONF-940785--2
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 192451
  • Archival Resource Key: ark:/67531/metadc671839

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  • December 31, 1994

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  • June 29, 2015, 9:42 p.m.

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  • June 24, 2016, 8:27 p.m.

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Wojtowicz, A.J.; Wisniewski, D. & Lempicki, A. Scintillation mechanisms in rare earth orthophosphates, article, December 31, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc671839/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.