Large-area, high-resolution, flexible x-ray scintillator film based on a novel 0d hybrid cuprous halide

X-ray scintillation detectors play an irreplaceable role in medical imaging, security inspections, and nondestructive detection.Recently, all-inorganic lead-free metal halide scintillators have attracted attention for addressing the drawbacks of lead-halide perovskites, such as severe self-absorption and toxicity.Nevertheless, high-resolution, flexible, and cost-effective lead-free scintillators are desirable for X-ray imaging applications.In this study, we designed a zero-dimensional hybrid cuprous halide, (MTP)2Cu4I6 (MTP + represents [C19H18P] + ), and synthesized single crystals.(MTP)2Cu4I6 shows intense yellow emission (618 nm) and a large Stokes shift of 185 nm, almost eliminating the effect of self-absorption.As a result, (MTP)2Cu4I6 exhibited a near-unity photoluminescence quantum yield (99.9%) with a light yield of 43800 photons per megaelectron volt.Moreover, (MTP)2Cu4I6 demonstrates an impressive detection performance with a fast response time of 2.18 s, a good linear response ranging from 0.038 Gyair s -1 to 53.4 Gyair s -1 , and a low detection limit of 37.6 nGyair s -1 .In a conceptual experiment, large-area flexible (MTP)2Cu4I6/polydimethylsiloxane (PDMS) scintillation films were fabricated to investigate their X-ray imaging performance.The (MTP)2Cu4I6/PDMS film exhibits a high-spatial resolution of 10.2 lp mm -1 when the modulation transfer function is 0.2 and superior flexible detection performance.The short lifetime, high-light yield, low toxicity, and low cost of (MTP)2Cu4I6 facilitate the development of next-generation X-ray scintillators.