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Avoiding concentration quenching and self-absorption in Cs4EuX6 (X = Br, I) by Sm2+ doping
Casper van Aarle1, Karl W Krämer2, Pieter Dorenbos1
1Faculty of Applied Sciences, Delft University of Technology Mekelweg 15 Delft The Netherlands c.vanaarle@tudelft.nl.
Journal of Materials Chemistry. C
|February 13, 2023
Summary
Doping cesium europium halides with samarium enhances near-infrared scintillator performance. Sm2+ doping significantly reduces self-absorption and improves energy resolution in Cs4EuI6 scintillators.
Area of Science:
- Materials Science
- Solid-State Physics
- Luminescence
Background:
- Cesium europium halides (Cs4EuBr6, Cs4EuI6) are investigated for near-infrared (NIR) scintillator applications.
- Undoped Cs4EuI6 exhibits significant self-absorption, limiting its utility.
- Understanding excitation migration and quenching mechanisms is crucial for optimizing scintillator performance.
Purpose of the Study:
- To evaluate the benefits of Sm2+ doping in Cs4EuBr6 and Cs4EuI6 for NIR scintillator applications.
- To investigate the impact of Sm2+ doping on self-absorption and concentration quenching.
- To analyze the migration rate of Eu2+ excitations and its effect on scintillator properties.
Main Methods:
- Synthesis and characterization of Sm2+-doped Cs4EuBr6 and Cs4EuI6.
- Temperature-dependent (10 K–300 K) spectral studies of excitation and emission.
- Scintillation measurements comparing doped and undoped Cs4EuI6 samples.
Main Results:
- Sm2+ doping in Cs4EuI6 effectively suppresses self-absorption.
- Concentration quenching is identified as weak but significant in undoped compounds.
- Doping Cs4EuI6 with 2% Sm improves energy resolution from 11% to 7.5%.
- Scintillation decay time in Cs4EuI6:2% Sm shortens from 4.8 s to 3.5 s.
Conclusions:
- Sm2+ doping is a promising strategy to enhance NIR scintillator performance in Cs4EuBr6 and Cs4EuI6.
- Reduced self-absorption and improved scintillation characteristics are achieved through Sm2+ incorporation.
- The study provides insights into excitation dynamics and spectral overlaps influencing scintillator efficiency.
