Abstract
AbstractRecently, zinc‐based metal halides have attracted numerous attention due to their excellent stability, low toxicity, and wide bandgaps. However, [ZnX4]2− tetrahedra in zinc‐based halides are found to be non‐optically active, which leads to poor photoluminescence quantum yields (PLQYs). Herein, Sb3+ ions are doped into hybrid zinc‐based halides of (C8H26N4)ZnCl6 single crystals (SCs) via an evaporative crystallization method. Compared with undoped (C8H26N4)ZnCl6 SCs with weak blue emission, Sb3+‐doped (C8H26N4)ZnCl6 SCs exhibit a strong broadband emission centered at 694 nm with a high PLQY of 67%, which is confirmed to be derived from self‐trapped excitons (STEs) of Sb3+ luminescent centers. Subsequently, Sb3+‐doped (C8H26N4)ZnCl6 is employed in flexible scintillation films, which demonstrates remarkable X‐ray imaging of complex objects with a spatial resolution of 3.6 lp mm−1 and a detection limit of 123.8 µGyair s−1, proving its promising potential in flexible X‐ray imaging applications.
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