Luminescence and scintillation properties of Eu3+-Doped Lu2.5Y0.5(Al2.5Ga2.5)O12 single crystals grown by the floating zone method

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-09-22 DOI:10.1016/j.radphyschem.2025.113319

Prapon Lertloypanyachai , Prom Kantuptim , Toshiaki Kunikata , Yusuke Endo , Anuwat Hassadee , Weerapong Chewpraditkul , Takumi Kato , Daisuke Nakauchi , Noriaki Kawaguchi , Kenichi Watanabe , Takayuki Yanagida

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Abstract

High-quality Eu³⁺-doped Lu_2.5Y_0.5(Al_2.5Ga_2.5)O₁₂ (LuYAGG:Eu) single crystals were successfully synthesized using a floating zone method with varying Eu³⁺ doping concentrations (0.5–10 mol%). X-ray diffraction (XRD) confirmed the formation of a single-phase garnet structure with no secondary phases, and no significant peak shifts were observed with increased Eu³⁺ content, indicating successful dopant substitution without significant distortion to the host lattice. Optical transmission spectra demonstrated good transparency across the visible range, with minimal absorption losses. Photoluminescence (PL) and radioluminescence (RL) spectra showed characteristic Eu³⁺ emission peaks, particularly the ⁵D₀→⁷F_j transition, confirming the occupation of non-centrosymmetric sites by Eu³⁺ ions. PL decay measurements and scintillation decay under X-ray excitation revealed millisecond-scale luminescence lifetimes, typical of Eu³⁺-activated garnet materials. Light yield (LY) analysis demonstrated that the 5 mol% Eu-doped sample exhibited the highest scintillation efficiency under 662 keV γ-ray excitation. These results suggest that LuYAGG:Eu single crystals are promising candidates for high-resolution scintillation applications.

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浮区法生长Eu3+掺杂Lu2.5Y0.5(Al2.5Ga2.5)O12单晶的发光和闪烁特性

采用浮动区法，在不同Eu3+掺杂浓度（0.5 ~ 10 mol%）的条件下，成功合成了高质量的Eu3+掺杂Lu2.5Y0.5(Al2.5Ga2.5)O12 （LuYAGG:Eu）单晶。x射线衍射（XRD）证实形成了没有二次相的单相石榴石结构，并且随着Eu3+含量的增加，没有观察到明显的峰移，表明掺杂剂取代成功，没有对主体晶格造成明显的畸变。透射光谱在可见光范围内具有良好的透明度，吸收损失最小。光致发光（PL）和放射发光（RL）光谱显示出Eu3+的特征性发射峰，特别是5D0→7Fj跃迁，证实了Eu3+离子占据了非中心对称的位置。PL衰减测量和x射线激发下的闪烁衰减揭示了毫秒级的发光寿命，典型的Eu3+活化石榴石材料。光产率（LY）分析表明，在662 keV γ射线激发下，掺5mol %铕的样品具有最高的闪烁效率。这些结果表明LuYAGG:Eu单晶是高分辨率闪烁应用的有希望的候选者。

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

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.