van Aarle, Casper; Roturier, Nils; Biner, Daniel A.; Krämer, Karl W.; Dorenbos, Pieter (2023). Light yield and thermal quenching of Ce3+ and Pr3+ co-doped LaBr3:Sm2+ near-infrared scintillators. Optical materials, 145, p. 114375. Elsevier 10.1016/j.optmat.2023.114375
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LaBr3:Ce3+ is a compound with excellent scintillation properties, but its ultraviolet emission does not match
well with the detection efficiency curves of silicon based photodetectors. In this work, Sm2+ is studied as
an activator for LaBr3 as its near-infrared emission can be detected with close to 100% efficiency by such
photodetectors. LaBr3:Sm2+ single crystals were grown with and without co-doping of Ce3+ or Pr3+. The
samples were studied by means of X-ray excited and photoluminescence spectroscopy at temperatures between
10 K and 300 K. Their spectroscopic properties are compared to LaBr3:Ce3+ and LaBr3:Eu2+. The effect of using
Ce3+ or Pr3+ as scintillation sensitiser for Sm2+ is assessed. It is found that energy transfer from host to Sm2+
greatly improves upon Ce3+ co-doping, but the quenching temperature of the Sm2+ emission decreases. The
quenching mechanism of both the Ce3+ and Sm2+ emission in LaBr3 is elaborated on. Furthermore, the effect
of charge compensating defects on the light yield and spectroscopic properties is discussed.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Biner, Daniel, Krämer, Karl |
Subjects: |
500 Science > 570 Life sciences; biology 500 Science > 540 Chemistry 500 Science > 530 Physics |
ISSN: |
0925-3467 |
Publisher: |
Elsevier |
Language: |
English |
Submitter: |
Karl Krämer |
Date Deposited: |
18 Oct 2023 06:58 |
Last Modified: |
29 Oct 2023 02:26 |
Publisher DOI: |
10.1016/j.optmat.2023.114375 |
BORIS DOI: |
10.48350/187260 |
URI: |
https://boris.unibe.ch/id/eprint/187260 |
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