Laser-Induced In Situ Crystallization of Hybrid Manganese(II) Bromide Arrays for X-Ray Imaging

Hybrid metal-halide scintillators are promising for X-ray imaging, but direct fabrication of patterned arrays with high spatial precision remains challenging. Here, we report a laser-induced in situ crystallization strategy for constructing pixelated scintillator arrays from a melt-processable manganese(II) bromide glass precursor, (BuTPP)₂MnBr₄ (BuTPP⁺, butyltriphenylphosphonium). The (BuTPP)₂MnBr₄ undergoes low-temperature glass formation and can be selectively recrystallized under femtosecond laser irradiation, enabling programmable spatial patterning. Structural analyses confirm the recovery of the crystalline phase after laser writing, while photophysical measurements show markedly enhanced photoluminescence and radioluminescence compared with the glassy state. Benefiting from efficient X-ray-to-light conversion and precise array definition, the patterned scintillators exhibit a high light yield of 24,600 photons MeV^-1, an X-ray detection limit of 4.89 µGy_air s^-1, and a spatial resolution of 10 lp mm^-1. This work establishes the laser-induced in situ crystallization strategy as an effective route to integrated hybrid scintillator arrays and offers a versatile platform for customizable and low-temperature processed X-ray imaging devices for imaging uses.