CsI:Tl+,Yb2+: ultra-high light yield scintillator with reduced afterglow
Result description
The afterglow problem has been preventing CsI:Tl single crystal scintillators from being used for applications in the field of computer tomography and high-speed imaging. We show that Yb2+ codoping in CsI:Tl can reduce it at least by one order of magnitude after 50 ms from X-ray cut-off compared to ordinary CsI:Tl. After optimization of the Yb2+ and Tl+ concentrations, the doubly doped CsI:Tl,Yb crystal exhibits an ultra-high light yield of 90 000 6000 photons MeV1, energy resolution 7.9%@511 keV and low afterglow level of about 0.035% at 80 ms. Simultaneous improvement in afterglow, light yield and energy resolution in CsI:Tl-based scintillators paves the way to its application in computer tomography and high-speed imaging. The physical mechanism androle of ytterbium ions in afterglow suppression are proposed.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
CsI:Tl+,Yb2+: ultra-high light yield scintillator with reduced afterglow
Original language description
The afterglow problem has been preventing CsI:Tl single crystal scintillators from being used for applications in the field of computer tomography and high-speed imaging. We show that Yb2+ codoping in CsI:Tl can reduce it at least by one order of magnitude after 50 ms from X-ray cut-off compared to ordinary CsI:Tl. After optimization of the Yb2+ and Tl+ concentrations, the doubly doped CsI:Tl,Yb crystal exhibits an ultra-high light yield of 90 000 6000 photons MeV1, energy resolution 7.9%@511 keV and low afterglow level of about 0.035% at 80 ms. Simultaneous improvement in afterglow, light yield and energy resolution in CsI:Tl-based scintillators paves the way to its application in computer tomography and high-speed imaging. The physical mechanism androle of ytterbium ions in afterglow suppression are proposed.
Czech name
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Czech description
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Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
CrystEngComm
ISSN
1466-8033
e-ISSN
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Volume of the periodical
16
Issue of the periodical within the volume
16
Country of publishing house
GB - UNITED KINGDOM
Number of pages
6
Pages from-to
3312-3317
UT code for WoS article
000333580100010
EID of the result in the Scopus database
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Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
BM - Solid-state physics and magnetism
Year of implementation
2014