Mn-Ce co-activated garnet crystals as bright scintillators for fast gamma and high-performance X-ray imaging

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Aochen Zhang, Mingqing Li, Chengyi Li, Peng Qiu, Zhongjun Xue, Shuwen Zhao, Zhe Zhang, Xiang Zheng, Jingjing Qu, Yuchong Ding, Dongzhou Ding
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引用次数: 0

Abstract

Cerium-activated garnet-structured crystal Gd3(Al,Ga)5O12:Ce (GAGG:Ce) is regarded as one of the most effective scintillators for high-resolution radiation detection due to its high light yield, excellent energy resolution, and exceptional radiation hardness. Nevertheless, the long radiative lifetime of Ce3+ and the slow component in scintillation decay time pose significant limitations on its further application. To overcome these problems, a novel strategy has been proposed to create a complementary de-excitation channel by introducing Mn2+ as a co-activator. This newly created channel facilitates the transfer of energy from Ce3+ to the acceptor during non-radiative processes, thereby enhancing the de-excitation efficiency of Ce3+. Notably, benefitting from the luminescence of dual luminescence centers along with the energy transfer between Ce3+ and Mn2+, the higher X-ray excited luminescence intensity (128 % enhancement compared to undoped crystals) and faster scintillation decay are simultaneously realized for the first time in GAGG:Ce crystals. The higher X-ray excited luminescence intensity results in an excellent spatial resolution of 30.0 lp mm−1, which is significant for X-ray imaging applications. This enhancement greatly facilitates the commercialization of Ce-activated garnet-structured scintillators. The study highlights the potential of the cooperation of Mn2+ and Ce3+ in optimizing scintillation performances, thereby opening avenues for the development of ultrafast and efficient inorganic scintillators.

Abstract Image

锰铈共活化石榴石晶体作为快速伽马和高性能x射线成像的明亮闪烁体
铈活化石榴石结构晶体Gd3(Al,Ga) 5012:Ce (GAGG:Ce)由于其高产光率、优异的能量分辨率和优异的辐射硬度,被认为是高分辨率辐射探测中最有效的闪烁体之一。然而,Ce3+的辐射寿命长,闪烁衰减时间慢,限制了其进一步应用。为了克服这些问题,提出了一种新的策略,通过引入Mn2+作为共激活剂来创建一个互补的去激励通道。这个新创建的通道促进了Ce3+在非辐射过程中向受体的能量转移,从而提高了Ce3+的去激发效率。值得注意的是,得益于双发光中心的发光以及Ce3+和Mn2+之间的能量转移,GAGG:Ce晶体首次实现了更高的x射线激发发光强度(比未掺杂晶体增强128 %)和更快的闪烁衰减。较高的x射线激发发光强度导致30.0 lp mm−1的优异空间分辨率,这对x射线成像应用具有重要意义。这种增强极大地促进了铈活化石榴石结构闪烁体的商业化。该研究强调了Mn2+和Ce3+在优化闪烁性能方面的合作潜力,从而为超快高效无机闪烁体的发展开辟了道路。
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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