Growth of high-quality, large-size CsI and CsI(Tl) scintillator single crystals via continuous-mass transport process method

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-04-17 DOI:10.1016/j.optmat.2025.117065

Hongyi Yang , Ziyi Lai , Wenzhen Wang , Huanzhen Qi , Shaohan Wang , Junfeng Chen , Juan Qin , Hui Zhang , Zebo Fang , Haitao Xu , Run Xu , Yan Zhu

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引用次数: 0

Abstract

Cesium iodide crystals with large sizes are highly desirable for X-ray and γ-ray detection applications. In this study, we have designed a simple and convenient continuous-mass transport process (CMTP) method to obtain large-size, high-quality pure CsI and Tl doped CsI crystals for the first time. This method allows for a continuous replenishment of the raw materials required for crystal growth in the growth container through a solute diff usion process, facilitating the stable growth of large single crystals (up to a size of 23.5 × 21 × 8 mm³). Furthermore, by adjusting the temperature difference between the growth and supplement containers, it is feasible to control the crystal growth rate. Compared with the inverse temperature crystallization (ITC) method, Tl doped CsI crystals grown by the CMTP method exhibit better crystallization quality, with both smaller values and narrower fluctuations for full width at half maximum (FWHM) in the X-ray rocking curve, and achieve comparable energy resolution (6.20 %–6.73 %), decay time (649–657 ns), afterglow level (0.1 % @ 68–98 ms), and higher light yield (78,000–83,000 photons/MeV). Our work provides a promising strategy for the preparation of larger-sized Tl doped CsI single crystals via the CMTP method.

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用连续质量输运法生长高质量、大尺寸CsI和CsI（Tl）闪烁体单晶

大尺寸的碘化铯晶体非常适合x射线和γ射线探测应用。在这项研究中，我们首次设计了一种简单方便的连续质量输运过程（CMTP）方法来获得大尺寸、高质量的纯CsI和掺Tl的CsI晶体。该方法允许通过溶质扩散过程在生长容器中不断补充晶体生长所需的原料，促进大单晶（最大尺寸为23.5 × 21 × 8 mm3）的稳定生长。此外，通过调节生长容器和补充容器之间的温差，可以控制晶体的生长速度。与反温度结晶法（ITC）相比，CMTP法生长的掺Tl CsI晶体具有更好的结晶质量，在x射线摇摆曲线中具有更小的值和更窄的半最大值全宽度波动（FWHM），并且具有相似的能量分辨率（6.20% - 6.73%），衰减时间（649-657 ns），余辉水平（0.1% @ 68-98 ms）和更高的光产率（78,000-83,000光子/MeV）。本研究为CMTP法制备大尺寸Tl掺杂CsI单晶提供了一种有前景的方法。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.