Converting SrI 2 :Eu 2+ into a near infrared scintillator by Sm 2+ co-doping
R. H.P. Awater (Student TU Delft)
M. S. Alekhin (Student TU Delft)
D. A. Biner (University of Bern)
K. W. Krämer (University of Bern)
P. Dorenbos (TU Delft - RST/Luminescence Materials, TU Delft - RST/Fundamental Aspects of Materials and Energy)
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Abstract
The luminescence and scintillation properties of SrI
2
single crystals doped with 5% Eu
2+
and 0.05%, 0.2% and 0.5% Sm
2+
are evaluated. X-ray excited and photoluminescence measurements show energy transfer from excited Eu
2+
ions to Sm
2+
ions. At a concentration of 0.5% Sm
2+
, the luminescence consists almost entirely of 740 nm emission from Sm
2+
5d-4f transitions. Co-doping SrI
2
:5% Eu
2+
with Sm
2+
provides a novel method to bypass the self-absorption problem encountered in large SrI
2
:Eu
2+
crystals and, at the same time, provides a unique near-infrared emitting scintillator with a light yield of approximately 40,000 photons/MeV.
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