One-Dimensional\nRed Light–Emissive Organic\nManganese(II) Halides as X‑Ray Scintillators

Although metal halide–based X-ray scintillators\nhave obtained\nsignificant development with adjustable radioluminescent spectral\nrange, the red light–emitting scintillator has been sparsely\nreported and remains a great challenge until now. To remedy this research\nblank, we investigated the scintillating property of red light–emissive\none-dimensional (1D) organic manganese halide of (MBIZ)(MnCl<sub>3</sub>H<sub>2</sub>O)·H<sub>2</sub>O (MBIZ = 2-methyl-1H-benzoimidazolium)\nwith a high PLQY of 71% under UV light excitation. Remarkably, this\nmanganese halide single crystal exhibits a compelling X-ray scintillating\nproperty in the red light spectral range with a light yield of 19 600\nphotons MeV<sup>–1</sup> and detection limit of 0.204 μGy/s,\nwhich is significantly better than the standard dosage for X-ray diagnostics.\nFurthermore, this manganese halide also exhibits excellent radiation\nresistance ability toward long-term continuous irradiation of high-dose\nX-ray with stable radiophotoluminescence intensity. Benefiting from\nthe abovementioned combined merits, (MBIZ)(MnCl<sub>3</sub>H<sub>2</sub>O)·H<sub>2</sub>O demonstrates high-performance X-ray imaging\nwith an outstanding spatial resolution of 11.1 lpmm<sup>–1</sup>. As far as we know, this is an infrequent red-emissive X-ray scintillator\nin metal halide materials, which highlights a successful structural\ndesign concept to explore new manganese halides as more desirable\nscintillators and expand the application field in medical diagnosis.