Lead-Free Scintillator Based on a Luminescent Green-Emitting Material Derived from Manganese(II) Chloride for High-Resolution X-Ray Imaging
Liu, Huiying ; Zhang, Miao ; Jiang, Minghao ; Han, Su-Ting ; Wong, Wai-Yeung
Journal of Inorganic and Organometallic Polymers and Materials • Published on 2 May 2025
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 cyclohexyldiphenylphos-
phine 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 monoden-
tate 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.
