Characterisation of Sm2+-doped CsYbBr3, CsYbI3 and YbCl2 for near-infrared scintillator application

Journal Article (2022)
Author(s)

Casper van Aarle (TU Delft - RST/Luminescence Materials)

Karl W. Krämer (University of Bern)

Pieter Dorenbos (TU Delft - RST/Luminescence Materials)

Research Group
RST/Luminescence Materials
Copyright
© 2022 C. van Aarle, Karl W. Krämer, P. Dorenbos
DOI related publication
https://doi.org/10.1016/j.jlumin.2022.119209
More Info
expand_more
Publication Year
2022
Language
English
Copyright
© 2022 C. van Aarle, Karl W. Krämer, P. Dorenbos
Research Group
RST/Luminescence Materials
Volume number
251
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

Fast energy transfer from Yb2+ to Sm2+ is a requirement when using Yb2+ as a sensitiser for Sm2+ emission for near-infrared scintillator applications. This cannot be achieved through dipole-dipole interactions due to the spin-forbidden nature of the involved Yb2+ transition, making the rate of energy transfer too slow for application. This work explores whether exploiting the exchange interaction by increasing the Yb2+ concentration to 99% is an effective way to increase the rate at which energy is transferred from Yb2+ to Sm2+. The scintillation characteristics of CsYbBr3:1%Sm, CsYbI3:1%Sm and YbCl2:1%Sm single crystals were studied through 137Cs excited pulse height spectra, X-ray excited decay and X-ray excited luminescence spectra. An energy resolution of 7% and a light yield of 30,000 ph/MeV was achieved with CsYbI3:1%Sm. Photoluminescence spectroscopy and decay studies were performed to study the band structure and relaxation dynamics.