Scintillation mechanisms in rare earth orthophosphates Page: 3 of 8
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will be a repeated electron exchange leaving two ions in unexcited 3+ charge
states. In this way the Ce3+ ion preserves a high quantum efficiency when
excited directly into its lower excited states but, after ionization, the new
nonradiative recombination channel is open, where the energy of Ce3+ electronic
excitation is carried away by lattice and/or local vibrations. Therefore, if the Yb
concentration is high enough, the energy gathered by Ce ions is lost
nonradiatively. Also, the preceding radiative and nonradiative energy transfer
from excited Yb ions to Ce ions will, by virtue of the same process, waste the
energy gathered by Yb ions. The final conclusion is that intentional or
unintentional codoping of Ce and Yb ions into the lattice of scintillator material
has to be carefully avoided.
ACKNOWLEDGMENTS
We gratefully acknowledge the support of the US Department of Energy
under grant DE-FG02-90ER61033 and contract DE-AC05-840R21400 with Martin
Marietta Energy Systems, Inc. and of the N. Copernicus University under grant
385-F/94.
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Wojtowicz, A.J.; Wisniewski, D. & Lempicki, A. Scintillation mechanisms in rare earth orthophosphates, article, December 31, 1994; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc671839/m1/3/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.