Issue 13, 2024

Enhancing persistent radioluminescence in perovskite scintillators through trap defect modulation

Abstract

Flexible X-ray sensors utilizing persistent radioluminescence scintillators have garnered considerable interest in medical imaging and industrial non-destructive testing. However, persistent radioluminescence in scintillators is typically generated by releasing stored electrons from deep trap defects at high temperatures, significantly limiting X-ray imaging sensitivity. The requirement of high temperatures for thermally-stimulated radioluminescence to erase harmful X-ray memory also impedes the repeated use of flexible sensors. Here we report high-efficiency persistent radioluminescence at room temperature by modulating the depth and density distribution of trap defects through codoping with Mn2+ and Sb3+ in CsCdCl3 scintillators. This results in a 20-fold increase in radioluminescence afterglow at room temperature, leading to significantly enhanced X-ray imaging sensitivity and facile erasure of harmful X-ray memory at relatively low temperatures for repeated use of the flexible sensors. Furthermore, the as-synthesized scintillators exhibit excellent resistance to thermal quenching, maintaining 96.63% radioluminescence efficiency at 493 K, and commendable stability concerning humidity and solvent exposure. Additionally, we fabricated flexible X-ray imaging sensors achieving high-resolution (20.0 lp mm−1) imaging of irregulate objects at room temperature using CsCdCl3:5%Mn2+/0.1%Sb3+ crystals. These findings provide valuable insights into ion doping for the regulation of trap defects in scintillators, motivating the development of high-resolution time-lapse X-ray imaging sensors.

Graphical abstract: Enhancing persistent radioluminescence in perovskite scintillators through trap defect modulation

Supplementary files

Article information

Article type
Research Article
Submitted
13 janv. 2024
Accepted
08 mai 2024
First published
17 mai 2024

Mater. Chem. Front., 2024,8, 2539-2548

Enhancing persistent radioluminescence in perovskite scintillators through trap defect modulation

X. Li, H. Guo, Y. Li, C. Lin and L. Xie, Mater. Chem. Front., 2024, 8, 2539 DOI: 10.1039/D4QM00039K

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