Journal
CRYSTENGCOMM
Volume 16, Issue 16, Pages 3312-3317Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ce42645a
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Funding
- National Natural Science Foundation of China [51372256]
- State Key Laboratory of Rare Earth Resources Utilization [RERU2014013]
- project of Sino-Czech
- MEYS (Czech side), KONTAKT II [12185]
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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 MeV-1, 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 and role of ytterbium ions in afterglow suppression are proposed.
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