Converting SrI 2 :Eu 2+ into a near infrared scintillator by Sm 2+ co-doping

Journal article (2019)

Authors

R.H.P. Awater Student
M. Alekhin Student
Daniel A. Biner University of Bern
K.M.B. Krämer University of Bern
P. Dorenbos RST/Fundamental Aspects of Materials and Energy - AS , RST/Luminescence Materials - AS
Research Group
RST/Luminescence Materials (AS) (TU Delft)
Copyright: © 2019 R.H.P. Awater, M. Alekhin, D. A. Biner, K.M.B. Krämer, P. Dorenbos
DOI: https://doi.org/10.1016/j.jlumin.2019.04.002
More Info
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Published Date

2019

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Luminescence Materials

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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