Inch-size and thickness-adjustable hybrid manganese halide single-crystalline films for high resolution X-ray imaging

Hybrid metal halides are emerging candidates for X-ray imaging. Due to the poor uniformity, low transmittance and high light scattering of polycrystalline film scintillator screen, resulting in low resolution of X-ray imaging, it is essential a challenging to explore new large-area and single crystal scintillator with high light yield and high resolution. Herein, inch-sized Mn-based halide single crystals, (C25H22P)(2)MnCl4 and (C25H22P)(2)MnBr4, with tunable thickness films from 0.12 mm to 0.72 mm were designed and grown. The crystals of (C25H22P)(2)MnCl4 and (C25H22P)(2)MnBr4 with high photoluminescence quantum yield (PLQY) of 62.42 % and 99.10 % exhibit high light yield of 56,457 and 78,937 photons/MeV under X-ray, which is 1.7 and 2.37 times higher than that of the commercial LYSO scintillator. Both the crystals show high X-ray radiation resistance even exposed to X-ray for 60 mins with a high dose rate of 504 mGy s(-1). The high photochemical stability under the continuous UV and X-ray irradiation contributes them towards X-ray imaging. With such significant merits, the high spatial resolutions about 21.02 and 25.61 lp/mm are achieved on the (C25H22P)(2)MnCl4 and (C25H22P)(2)MnBr4 single crystal films, which demonstrates the great potential of large size single crystal screen for commercial high-resolution X-ray imaging applications.