Optical and Scintillation Properties of Tb-Doped Gadolinium Pyrosilicate Single Crystals

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-07-19 DOI:10.3390/photonics11070673

Prom Kantuptim, Takumi Kato, D. Nakauchi, N. Pattanaboonmee, N. Kawaguchi, Kenichi Watanabe, W. Chewpraditkul, Takayuki Yanagida

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引用次数: 0

Abstract

Gadolinium pyrosilicate (GPS, Gd2Si2O7) single crystals with different doping concentrations of Tb (0.1–2.0 mol%) are successfully fabricated using the floating-zone technique. In this work, the dependence of Tb-doping concentration on the photoluminescence (PL) and scintillation properties of Tb-doped GPS (Tb:GPS) has been investigated. The PL emission contour graph shows multiple emissions, with the strongest emissions at 378 nm for 0.1% and 0.5% Tb-doping and 544 nm for 1.0% and 2.0% Tb-doping, corresponding to Tb3+ 4f-4f transitions. The PL lifetimes of the specimens range from 4.89 to 5.22 ms. The scintillation spectra exhibit comparable wavelength and intensity trends to the PL emission. The scintillation lifetimes of the specimens range from 2.41 to 3.88 ms. The Tb:GPS specimens demonstrate a relatively excessive afterglow level, with Af20 values ranging from 1640 to 7250 ppm and Af40 values ranging from 136 to 362 ppm. Using recently developed pulse height measurement for millisecond decay scintillators, under excitation at 662 keV γ-rays, the 1.0% Tb:GPS specimen exhibits the highest scintillation light yield among all other specimens at 95,600 ph/MeV, making Tb:GPS one of the highest light yield oxide scintillators.

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掺镱焦硅酸钆单晶的光学和闪烁特性

利用浮区技术成功制备了不同掺杂浓度（0.1-2.0 摩尔%）铽的钆焦硅酸盐（GPS，Gd2Si2O7）单晶。在这项工作中，研究了掺铽浓度对掺铽 GPS（Tb:GPS）的光致发光（PL）和闪烁特性的影响。光致发光发射等值线图显示了多种发射，掺杂 0.1% 和 0.5% Tb 的发射最强，为 378 nm；掺杂 1.0% 和 2.0% Tb 的发射最强，为 544 nm，对应于 Tb3+ 4f-4f 转变。试样的聚光寿命为 4.89 至 5.22 毫秒。闪烁光谱显示出与 PL 发射相似的波长和强度趋势。试样的闪烁寿命为 2.41 至 3.88 毫秒。Tb:GPS 试样显示出相对过高的余辉水平，Af20 值从 1640 到 7250 ppm 不等，Af40 值从 136 到 362 ppm 不等。利用最近开发的毫秒衰变闪烁体脉冲高度测量方法，在 662 keV γ 射线激励下，1.0% Tb:GPS 试样的闪烁光产率为 95,600 ph/MeV，是所有试样中最高的，使 Tb:GPS 成为光产率最高的氧化物闪烁体之一。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.