Low‐Melting Perovskite Glass for Multimodal Anti‐Counterfeiting and X‐Ray Imaging

Glass, with its unique amorphous properties, offers low thermal conductivity, high catalytic activity, insensitivity to interfacial lattice mismatch, and the absence of grain boundaries. Melt‐quenched organic–inorganic hybrid glass has recently gained significant attention as an emerging material because of its excellent processability and formability. Here, an SbCl 3 (C 25 H 46 ClN) x halide with a low melting point (90 °C) and significant formability is reported. Both the crystalline and glass states of SbCl 3 (C 25 H 46 ClN) x have double broadband emission, and the glass state exhibits negative thermal quenching, which is rare in metal halides. Interestingly, the luminescence properties of SbCl 3 (C 25 H 46 ClN) x glass with different x values differ. This feature is utilized to design multimodal anti‐counterfeiting and information encryption applications. Additionally, The inherent melt processing capability of SbCl 3 (C 25 H 46 ClN) x allows it to be shaped into various forms suitable for practical applications. SbCl 3 (C 25 H 46 ClN) x scintillator screens (diameter 2.2 cm) are successfully prepared by low‐temperature melting, achieving an X‐ray imaging resolution of 18 line pairs per millimeter (18 lp mm −1 ). This study demonstrates the potential of melt‐processed organic–inorganic hybrid glass SbCl 3 (C 25 H 46 ClN) x in anti‐counterfeiting, information encryption, and X‐ray detection.