Seed-Crystal-Induced Cold Sintering Toward Metal Halide Transparent Ceramic Scintillators,Advanced Materials

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Seed-Crystal-Induced Cold Sintering Toward Metal Halide Transparent Ceramic Scintillators
Advanced Materials ( IF 27.4 ) Pub Date : 2022-03-01 , DOI: 10.1002/adma.202110420
Kai Han ₁ , Kostiantyn Sakhatskyi _{2,

3} , Jiance Jin ₁ , Qinyuan Zhang _{1,

4} , Maksym V Kovalenko _{2,

3} , Zhiguo Xia _{1,

4}

Affiliation

Scintillators with high spatial resolution at a low radiation dose rate are desirable for X-ray medical imaging. To challenge the state-of-art technology, it is necessary to design large-area wafers with high light yield, oriented light transport, and reduced light scattering. Here, a seed-crystal-induced cold sintering is adopted and a <001>-textured TPP₂MnBr₄ (TPP: tetraphenylphosphonium) transparent ceramic is fabricated with a large-area wafer of 5 cm in diameter, exhibiting high optical transparency of above 68% over the 450–600 nm range. The compelling scintillation performance of the TPP₂MnBr₄ wafer includes a light yield of ≈78 000 ± 2000 photons per MeV, a low detection limit 8.8 nanograys per second, about 625 times lower than the requirement of X-ray diagnostics (5500 nanograys per second), and an energy resolution of 17% for high-energy γ-rays (662 keV). X-ray imaging demonstrates a high spatial resolution of 15.7 lp mm⁻¹. Moreover, the designed material exhibits good retention of the radioluminescence intensity and light yield. This work presents a paradigm for achieving light-guiding properties with high transparency and large-area fabrication by grain orientation engineering, and the transparent, textured metal halide ceramic scintillator is expected to provide a route for advancement in the X-ray imaging of tomorrow.

中文翻译：

晶种诱导冷烧结金属卤化物透明陶瓷闪烁体

X 射线医学成像需要在低辐射剂量率下具有高空间分辨率的闪烁体。为了挑战最先进的技术，有必要设计具有高光产率、定向光传输和减少光散射的大面积晶圆。在此，采用晶种诱导冷烧结，利用直径为 5 cm 的大面积晶片制备了 <001> 织构的 TPP ₂ MnBr ₄ (TPP：四苯基鏻) 透明陶瓷，具有高于在 450–600 nm 范围内为 68%。_{TPP 2} MnBr ₄引人注目的闪烁性能晶圆包括 ≈78 000 ± 2000 光子/MeV 的光产率、每秒 8.8 纳格雷的低检测限，比 X 射线诊断要求（每秒 5500 纳格雷）低约 625 倍，能量分辨率为 17%用于高能 γ 射线（662 keV）。X 射线成像展示了 15.7 lp mm ^-1的高空间分辨率。此外，所设计的材料表现出良好的辐射发光强度和光输出保持性。这项工作提出了一种通过晶粒取向工程实现高透明度和大面积制造的光导特性的范例，透明的织构金属卤化物陶瓷闪烁体有望为未来的 X 射线成像提供一条途径。

更新日期：2022-03-01

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