Organic Cation Methylation Design of Hybrid Eu(II)-based Halide Scintillators for Improved X-Ray Detection and Imaging.
basic_science · Level V
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- Record sourced from PubMed, PMID 41025753.
- Also identified by DOI 10.1002/adma.202510379.
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Abstract
Organic-inorganic hybrid scintillators (OIHSs) have emerged as promising candidates for X-ray imaging. However, inhibiting the concentration quenching effect and reducing vacancy defects remain major challenges for high-performance OIHSs. Herein, a modification strategy of organic cation methylation is introduced to prepare PDMIMEuX<sub>3</sub> (PDMIM-X, PDMIM = 1-Propyl-2,3-dimethylimidazolium, X = Br, I) upon PMIMEuX<sub>3</sub> (PMIM-X, PMIM = 1-Propyl-3-methylimidazolium). Benefiting from the increased Eu-Eu chain spacing and structural rigidity by the steric effect of inserted cationic methylation, PDMIM-X suppresses nonradiative recombination between luminescent centers and the halogen vacancy defects. Particularly, PDMIM-Br designed via such a cation methylation exhibits high light output, which is 3.57 and 9.7 times higher than that of commercial Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce and original PMIM-Br, respectively, and thus it also demonstrates a low detection limit of 42.61 nGy s<sup>-1</sup>. Moreover, leveraging the capability of rapid in situ solution processing, a transparent and large-area PDMIM-Br@film is prepared with a spatial resolution of 21.1 lp mm<sup>-1</sup> for X-ray imaging. This study developed high-performance OIHSs and further provided an effective strategy via materials design to improve the detection and imaging capabilities.