Ultrafast GGAG:Ce X-ray scintillation ceramics with Ca2+ and Mg2+ co-dopants
Ultrafast GGAG:Ce X-ray scintillation ceramics with Ca2+ and Mg2+ co-dopants
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DOI：
10.1016/j.ceramint.2022.05.005
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发表时间：
2022-05
影响因子：
5.2
通讯作者：
Xin Huang;Jin He;Yiguang Jiang;W. Chewpraditkul;Longfei Zhang
中科院分区：
文献类型：
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作者：
Xin Huang;Jin He;Yiguang Jiang;W. Chewpraditkul;Longfei Zhang
在铝酸盐石榴石材料中，掺Ce的镓铝榴石陶瓷(GGAG：Ce)具有快速闪烁特性，在医学成像、高能射线探测和大功率LED照明等方面具有广阔的应用前景。本研究采用两步法制备了Me~(2+)共掺Gd3Ga3Al_2O_(12)：Ce闪烁陶瓷(Me~(2+)=0.1Mg，Ca)：固相反应-空气退火。详细研究了这些共掺杂陶瓷的光学和闪烁性能，包括吸收、射电发光、光产额和衰减时间。掺镁和掺钙导致Ce3+氧化为Ce4+，加速了闪烁过程，降低了光产额。Ca~(2+)和Mg~(2+)共掺杂对这一现象表现出协同效应。与0.2at%Ca~(2+)和0.2at%Mg~(2+)单掺GGAG：Ce相比，共掺0.1at%Ca~(2+)和0.1at%Mg~(2+)的GGAG：Ce具有最快的衰减时间(∼为31 ns)，并保持了较高的光产额(∼为27400±1.1600h/MeV，未掺杂GGAG：Ce的77%)。这些发现为设计具有超快衰减时间的Ce激活的石榴石闪烁材料在飞行时间(TOF)PET技术中的应用提供了新的线索。
Among the aluminate garnet materials, cerium-doped gadolinium gallium aluminum garnet ceramics (GGAG:Ce) show fast scintillation properties, which suggests that they have promising applications in medical imaging, high-energy ray detection and high-power LED lighting. In this study, Gd3Ga3Al2O12:Ce scintillation ceramics co-doped with Me2+(Me = Mg, Ca) are fabricated using a two-steps route: a solid-state reaction followed by annealing in air. The optical and scintillation properties, including the absorption, radio luminescence (RL), light yield, and decay time, of these co-doped ceramics are studied in detail. Doping with Mg2+and Ca2+leads to the oxidation of Ce3+to Ce4+, which accelerates the scintillation process and decreases the light yield. Co-doping with Ca2+and Mg2+shows a synergistic effect on this phenomenon. Compared with 0.2 at% Ca2+or 0.2 at% Mg2+single-doped GGAG:Ce, the GGAG:Ce co-doped with 0.1 at% Ca2+and 0.1 at% Mg2+has the fastest decay time (∼31 ns) and maintains a relatively high light yield (∼27400 ± 1600 ph/MeV, 77% of undoped GGAG:Ce). These findings shed new light on designing Ce-activated garnet scintillator materials with ultra-fast decay time for applications in time-of-flight (TOF) PET technology.