Photoluminescence and structural characterization of MgAl2O4 irradiated with swift Bi ions

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-04-18 DOI:10.1016/j.jlumin.2025.121259

V. Skuratov , O. Korolik , M. Mamatova , J. O’Connell , N. Kirilkin , A. Dauletbekova , A. Akilbekov

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引用次数: 0

Abstract

The optically stimulated luminescence in MgAl₂O₄ single crystals associated with defects produced by high energy (670 MeV) Bi ions with electronic stopping power S_e = 36.6 keV/nm has been studied. Such energy loss is almost five times higher than the threshold for latent track formation in spinel, about 7.5 keV/nm. High resolution transmission electron microscopy (HRTEM) examination has revealed that ion tracks in the sub-surface layer of irradiated specimens retain a crystalline structure. Photoluminescence (PL) spectra from the near surface region were recorded during excitation at 355 nm, 473 nm and 532 nm using a laser confocal microscopy technique. It was found that PL spectra were always composed of broad overlapping bands positioned over the entire spectral range from the excitation wavelengths till 850 nm. It is suggested that such spectral composition might be due to a high concentration of antisite defects with large variation of the Mg/Al ratio in the disordered regions surrounding ion track cores. PL measurements on 23 MeV Ne (S_e = 3.5 keV/nm) ion irradiated spinel, when no latent tracks are formed, have produced similar spectra as those for Bi ions. This indicates the same nature of defect-related luminescent centers formed at significantly different levels of electronic stopping power – below and above the threshold for latent track formation. The conclusion and findings may provide new insights for interpreting the optical spectra in this material.

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快速铋离子辐照MgAl2O4的光致发光及结构表征

本文研究了电子停止功率Se = 36.6 keV/nm的高能（670 MeV） Bi离子对MgAl2O4单晶产生缺陷的光激发发光。这种能量损失几乎是尖晶石中潜在径迹形成阈值的5倍，约为7.5 keV/nm。高分辨率透射电子显微镜（HRTEM）检查显示，离子轨迹在辐照样品的亚表面层保留晶体结构。利用激光共聚焦显微镜技术记录了在355nm、473nm和532nm激发下近表面的光致发光光谱。发现从激发波长到850 nm的整个光谱范围内，PL光谱总是由宽的重叠带组成。这种光谱组成可能是由于离子轨道核周围的无序区存在高浓度的反位缺陷，且Mg/Al比变化较大。23 MeV Ne （Se = 3.5 keV/nm）离子辐照尖晶石，在未形成潜径迹的情况下，产生了与Bi离子相似的光谱。这表明在显著不同的电子停止功率水平下形成的缺陷相关发光中心的性质相同-低于和高于潜在径迹形成的阈值。这些结论和发现可能为解释该材料的光谱提供新的见解。

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

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.