van Aarle, Casper; Krämer, Karl W.; Dorenbos, Pieter (2021). The role of Yb2+ as a scintillation sensitiser in the near-infrared scintillator CsBa2I5:Sm2+. Journal of luminescence, 238, p. 118257. Elsevier 10.1016/j.jlumin.2021.118257
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The feasiblity of using Yb2+ as a scintillation sensitiser for CsBa2I5:Sm2+ near-infrared scintillators has been assessed. CsBa2I5 samples with concentrations ranging from 0.3% to 2% Yb2+ and 0–1% Sm2+ have been studied. The scintillation properties have been determined and the dynamics of the scintillation mechanism have been studied through photoluminescence measurements. Radiationless energy transfer between Yb2+ ions plays a key role in increasing the ratio between the spinforbidden and spin-allowed emission with increasing Yb2+ concentration in samples where Yb2+ is the only dopant. In samples co-doped with Sm2+, the Yb2+ 4f13[2F7/2]5d1[LS] and 4f13[2F7/2]5d1[HS] states both serve as donor states for radiationless energy transfer to Sm2+ with a rate of energy transfer that is inversely proportional to the luminescence lifetime the respective donor states. At a Sm2+ concentration of 1%, 85% of the Yb2+ excitations are transferred to Sm2+ through radiationless energy transfer. Almost all of the remaining Yb2+ emission is reabsorbed by Sm2+, resulting in nearly complete energy transfer.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Krämer, Karl |
Subjects: |
500 Science > 530 Physics 500 Science > 540 Chemistry |
ISSN: |
0022-2313 |
Publisher: |
Elsevier |
Language: |
English |
Submitter: |
Karl Krämer |
Date Deposited: |
23 Jun 2021 19:25 |
Last Modified: |
05 Dec 2022 15:51 |
Publisher DOI: |
10.1016/j.jlumin.2021.118257 |
BORIS DOI: |
10.48350/156931 |
URI: |
https://boris.unibe.ch/id/eprint/156931 |
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