Stable Organic Antimony Halides with Near-Unity Photoluminescence Quantum Yield for X-Ray Imaging

X-ray imaging technology has been widely used in the fields of environmental monitoring, safety inspection, nondestructive examination, space exploration, and medical diagnosis, among which scintillation materials play a vital role in indirectly converting X-ray to visible photons. Here, a zero-dimensional organic-inorganic hybrid halide C50H44P2SbCl5 crystal is prepared via a facile antisolvent precipitation method at room temperature. The single crystal of C50H44P2SbCl5 displays a strong yellow broadband emission centered at 592 nm with a near-unity photoluminescence quantum yield of 98.42%. Importantly, C50H44P2SbCl5 crystals show great environmental stability and irradiation stability. Radioluminescence characterization indicates that C50H44P2SbCl5 crystals exhibit a good linear response to X-ray dose rates along with an excellent light yield of 44 460 photons MeV-1, surpassing that of commercial inorganic LuAG:Ce scintillator. The spatial resolution of the C50H44P2SbCl5-based scintillating screen is determined to be 8.2 lp mm(-1). In conjunction with polymer thin film, the excellent scintillating feature of organic-inorganic hybrid halides offers exciting opportunities for achieving high-quality flexible X-ray imaging.