Luminescence Improvement of Hybrid Zinc‐Based Halides via Sb<sup>3+</sup>‐Doping for Flexible X‐Ray Imaging
Dehai Liang, Meng Wang, Shuangyi Zhao, Zhiyuan Xu, Saif M. H. Qaid, Qingkai Qian, Zhigang Zang
Abstract
Abstract Recently, zinc‐based metal halides have attracted numerous attention due to their excellent stability, low toxicity, and wide bandgaps. However, [ZnX 4 ] 2− tetrahedra in zinc‐based halides are found to be non‐optically active, which leads to poor photoluminescence quantum yields (PLQYs). Herein, Sb 3+ ions are doped into hybrid zinc‐based halides of (C 8 H 26 N 4 )ZnCl 6 single crystals (SCs) via an evaporative crystallization method. Compared with undoped (C 8 H 26 N 4 )ZnCl 6 SCs with weak blue emission, Sb 3+ ‐doped (C 8 H 26 N 4 )ZnCl 6 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 Sb 3+ luminescent centers. Subsequently, Sb 3+ ‐doped (C 8 H 26 N 4 )ZnCl 6 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 µGy air s −1 , proving its promising potential in flexible X‐ray imaging applications.