The role of Yb2+ as a scintillation sensitiser in the near-infrared scintillator CsBa2I5:Sm2+

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

[img]
Preview
Text
332_CsBa2I5_Yb_JLum.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (1MB) | Preview

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)

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:

27 Jun 2021 03:08

Publisher DOI:

10.1016/j.jlumin.2021.118257

BORIS DOI:

10.48350/156931

URI:

https://boris.unibe.ch/id/eprint/156931

Actions (login required)

Edit item Edit item
Provide Feedback