Liu Qunhuo, Ran Peng, Chen Weilin, Shi Nian, Zhang Wei, Qiao Xvsheng, Jiang Tingming, Yang Yang Michael, Ren Jinjun, Wang Zhiyu, Qian Guodong, Fan Xianping
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
Adv Sci (Weinh). 2023 Dec;10(34):e2304889. doi: 10.1002/advs.202304889. Epub 2023 Oct 18.
Metal halide crystals are bright but hygroscopic scintillator materials that are widely used in X-ray imaging and detectors. Precipitating them in situ in glass to form glass ceramics (GCs) scintillator offers an efficient avenue for large-scale preparation, high spatial resolution, and excellent stability. However, precipitating a high fraction of metal halide nanocrystals in glass to maintain high light yield remains a challenge. Herein, an ionic-covalent hybrid network strategy for constructing GCs scintillator with high crystallinity (up to ≈37%) of BaCl : Eu nanocrystals is presented. Experimental data and simulations of glass structure reveal that the Ba -Cl clustering promotes the high crystallization of BaCl nanocrystals. The ultralow phonon energy (≈200 cm ) of BaCl nanocrystals and good Eu reduction effect enable high photoluminescence inter quantum efficiency (≈80.41%) in GC. GCs with varied crystallinity of BaCl : Eu nanocrystals demonstrate efficient radioluminescence and tunable scintillator performance. They either outperform Bi Ge O single crystal by over 132% steady-state light yield or provide impressive X-ray imaging resolutions of 20 lp mm . These findings provide a new design strategy for developing bright transparent GCs scintillators with a high fraction of metal halide nanocrystals for X-ray high-resolution imaging applications.
金属卤化物晶体是明亮但具有吸湿性的闪烁体材料，广泛应用于X射线成像和探测器中。在玻璃中原位沉淀它们以形成玻璃陶瓷（GCs）闪烁体为大规模制备、高空间分辨率和优异稳定性提供了一条有效途径。然而，在玻璃中沉淀高比例的金属卤化物纳米晶体以保持高光产率仍然是一个挑战。在此，提出了一种离子-共价杂化网络策略，用于构建具有高结晶度（高达≈37%）的BaCl₂:Eu纳米晶体的GCs闪烁体。玻璃结构的实验数据和模拟表明，Ba-Cl簇促进了BaCl₂纳米晶体的高结晶。BaCl₂纳米晶体的超低声子能量（≈200 cm⁻¹）和良好的Eu还原效果使得GC中具有高光致发光内量子效率（≈80.41%）。具有不同结晶度的BaCl₂:Eu纳米晶体的GCs表现出高效的辐射发光和可调的闪烁体性能。它们的稳态光产率比Bi₄Ge₃O₁₂单晶高出132%以上，或者提供令人印象深刻的20 lp mm⁻¹的X射线成像分辨率。这些发现为开发用于X射线高分辨率成像应用的具有高比例金属卤化物纳米晶体的明亮透明GCs闪烁体提供了一种新的设计策略。
