Multiple thermoluminescence glow peaks and afterglow suppression in CsI:Tl co-doped with Eu2+ or Yb2

CsI:Tl is a widely utilized scintillator material with many desirable properties but its applicability is limited by persistent afterglow. However, effective afterglow suppression has been achieved by co-doping with divalent lanthanides. The present report is concerned with observation of multiple t...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2015-04, Vol.80 (1)
Main Authors: Bartram, R H, Kappers, L A, Hamilton, D S, Brecher, C, Ovechkina, E E, Miller, S R, Nagarkar, V V
Format: Article
Language:English
Subjects:
Europium
Lanthanides
Scintillation counters
Thermoluminescence
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Summary:CsI:Tl is a widely utilized scintillator material with many desirable properties but its applicability is limited by persistent afterglow. However, effective afterglow suppression has been achieved by co-doping with divalent lanthanides. The present report is concerned with observation of multiple thermoluminescence glow peaks in CsI:Tl,Eu and CsI:Tl,Yb, attributed to varying distributions of charge-compensating cation vacancies relative to divalent lanthanide co-dopants, and the subsequent modification of these distributions by repeated observations. It is observed that Yb2+ provides a slightly shallower electron trap than Eu2+, and that it can occupy a face-centered position by virtue of its relatively small ionic radius; the latter observation is confirmed by electrostatic calculations. It is also found that repeated observation of thermoluminescence in these materials has a modest adverse effect on afterglow suppression.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/80/1/012003