Issue 24, 2023

Mn2+-doped Cs2ZnBr4 scintillator for X-ray imaging

Abstract

Luminescent metal halides with a high photoluminescence quantum yield (PLQY), large Stokes shift and strong X-ray absorption capability have demonstrated prospects in high-energy radiation detection. Here, we report Mn2+-doped all-inorganic metal halide Cs2ZnBr4 as an X-ray imaging scintillator. The as-prepared Cs2ZnBr4:Mn2+ shows two emission bands peaking at 526 and 655 nm, respectively, with a PLQY of up to 58.8%. It is found that the dual emissions belong to the spin-forbidden d–d transition of Mn2+ ions in different coordination configurations, and the involved luminescence and evolution mechanisms have been analyzed. To investigate the scintillation properties, we successfully fabricated a homogeneous thin film scintillation screen containing Cs2ZnBr4:25%Mn2+, which shows good X-ray scintillation performance with a light yield of about 15 600 photons per MeV and a low detection limit of 1.16 μGyair s−1. Moreover, the flexible and large-area scintillation screens exhibit good X-ray imaging performance with a spatial resolution of 5.06 lp mm−1 and excellent stability under continuous X-ray irradiation.

Graphical abstract: Mn2+-doped Cs2ZnBr4 scintillator for X-ray imaging

Supplementary files

Article information

Article type
Paper
Submitted
06 okt 2022
Accepted
09 nov 2022
First published
15 nov 2022

J. Mater. Chem. C, 2023,11, 8052-8061

Mn2+-doped Cs2ZnBr4 scintillator for X-ray imaging

B. Su, K. Han and Z. Xia, J. Mater. Chem. C, 2023, 11, 8052 DOI: 10.1039/D2TC04249E

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