High Transparent Sr _0.84 Tb _0.16 F _2.16 Glass‐Ceramic Scintillators with Excellent Thermal Stability for High‐Temperature X‐Ray Imaging

Abstract Glass‐ceramic (GC) scintillators, which possess high transparency, outstanding X‐ray excited luminescence (XEL) intensity, and excellent thermal stability, have attracted significant attention. In this paper, two strategies, including crystallization of GC and energy transfer from traps, are applied to enhance luminescent performances and thermal stability of glass scintillators. Herein, an optimal sample (GCL‐620) with high crystallinity (32.8%) and high transparency (83.1% at 542 nm) is obtained. For photoluminescent performances, GCL‐620 exhibits high internal quantum efficiency (92.7%) and excellent thermal stability (99.9% at 573 K). For XEL performances, GCL‐620 exhibits high XEL intensity (329% of that of Bi ₄ Ge ₃ O ₁₂ ), low detection limit (3.17 µGy _air s ⁻¹ ), and excellent spatial resolution (24 lp mm ⁻¹ ). Besides, anti‐thermal‐quenching performance (119% at 393 K) and zero‐thermal‐quenching (100% at 573 K) performance of GCL‐620 are both observed in XEL. Imaging clarity of high‐temperature X‐ray imaging does not decrease with increasing temperature, and the spatial resolution of GCL‐620 remains 24 lp mm ⁻¹ at high temperature. All results illustrate that Sr _0.84 Tb _0.16 F _2.16 GC scintillators have a broad prospect in high‐temperature X‐ray imaging.