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<p>Manganese(II) halides have attracted significant research attention because of their unique zero-dimensional structures, low toxicity, structural diversity, and tunable photoluminescent properties. However, the development of neutral manganese(II) chlorides has lagged behind their manganese(II) bromide counterparts in X-ray imaging applications. Herein, we report a green-emitting neutral monodentate manganese(II) chloride complex (<b>H-Cl</b>) by introducing the cyclohexyldiphenylphosphine oxide as the ligand, which could be synthesized via a simple room-temperature solvent evaporation method. Complex <b>H-Cl</b> exhibits bright photoluminescence with an emission peak at 516&#xa0;nm with a full-width at half-maximum (FWHM) of 61&#xa0;nm, and achieves a photoluminescence quantum yield (PLQY) of 16.69%, surpassing most reported neutral monodentate manganese(II) chlorides. As an X-ray scintillator, complex <b>H-Cl</b> realizes a detection limit of 1.581 µGy/s, which is much lower than that of the standard for X-ray medical diagnostics. It also shows a high spatial resolution exceeding 9.6 lp/mm, highlighting its potential for advanced scintillator design and high-resolution X-ray imaging technology.</p> Graphical Abstract <p></p>

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Lead-Free Scintillator Based on a Luminescent Green-Emitting Material Derived from Manganese(II) Chloride for High-Resolution X-Ray Imaging

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月2日

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  • Xiaokang Zheng,
  • Peng Tao,
  • Hua Wang,
  • Lijie Zhang,
  • Wai-Yeung Wong

摘要

Manganese(II) halides have attracted significant research attention because of their unique zero-dimensional structures, low toxicity, structural diversity, and tunable photoluminescent properties. However, the development of neutral manganese(II) chlorides has lagged behind their manganese(II) bromide counterparts in X-ray imaging applications. Herein, we report a green-emitting neutral monodentate manganese(II) chloride complex (H-Cl) by introducing the cyclohexyldiphenylphosphine oxide as the ligand, which could be synthesized via a simple room-temperature solvent evaporation method. Complex H-Cl exhibits bright photoluminescence with an emission peak at 516 nm with a full-width at half-maximum (FWHM) of 61 nm, and achieves a photoluminescence quantum yield (PLQY) of 16.69%, surpassing most reported neutral monodentate manganese(II) chlorides. As an X-ray scintillator, complex H-Cl realizes a detection limit of 1.581 µGy/s, which is much lower than that of the standard for X-ray medical diagnostics. It also shows a high spatial resolution exceeding 9.6 lp/mm, highlighting its potential for advanced scintillator design and high-resolution X-ray imaging technology.

Graphical Abstract