Scintillators are materials that absorb a high energy particle (α,β,γ radiation) and convert it into a short pulse of visible or near-visible light. CsBa2I5:Eu2+,Sm2+ has a remarkably high energy resolution of 3.2% at 662 keV gamma excitation and a scintillation decay time of 2.1 µs.
Sm2+ co-doping shifts the emission wavelength to 755 nm and eliminates the Eu2+ self-absorption. The novel double-doping principle opens up an entirely new class of near-infrared (NIR) scintillators.
This work was carried out in the groups of Prof. Pieter Dorenbos (TU Delft) and PD Dr. Karl Krämer.
References:
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W. Wolszczak, K. W. Krämer, P. Dorenbos;
"CsBa2I5:Eu2+,Sm2+ - The First High-Energy Resolution Black Scintillator for γ-Ray Spectroscopy"
Phys. Status Solidi RRL, 2019, 13(9), 1900158;
doi:10.1002/pssr.201900158
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P. Dorenbos, K. Krämer, M. Alekhin;
"Scintillator material comprising a crystalline alkaline-earth halide doped with an activator and co-doped with Sm2+"
PCT Int. Patent Application, WO 2019137961;
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2019137961
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P. Dorenbos, K. Krämer, M. Alekhin;
"Scintillator material comprising a crystalline cation halide doped by Eu2+ and co-doped by Sm2+"
PCT Int. Patent Application, WO 2019137962;
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2019137962
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