Study of OSL response of LiMgPO4: Al phosphors

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-09-18 DOI:10.1016/j.jlumin.2025.121557

Noemi Aguiar Silva , Alvaro de Farias Soares , Isadora Augusta Machado Duque , Lilia Coronato Courrol , Marcio Yee , Nilo Francisco Cano , Rene Rojas Rocca , Sonia Hatsue Tatumi

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引用次数: 0

Abstract

The optically stimulated luminescence (OSL) properties of LiMgPO₄ (LMP) phosphor were thoroughly investigated to assess the impact of aluminum (Al) doping on its luminescent behavior, particularly in terms of its dose response to ionizing radiation and its emission characteristics. Undoped LMP and doped with different Al concentrations crystals were synthesized via a solid-state reaction method. Structural and morphological characterizations, performed using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), confirmed the effective and homogeneous incorporation of Al into the crystal lattice, with no evidence of secondary phases or dopant segregation. A remarkable enhancement in both continuous-wave (CW-OSL) and linear-modulated (LM-OSL) luminescence responses to β-irradiation was observed in the Al-doped samples when compared to the undoped ones. To gain deeper insight into the trapping and recombination mechanisms, the CW-OSL and LM-OSL signals were deconvoluted general-order kinetic (GOK) model. Moreover, emission spectra measurements under 259 nm excitation revealed six distinct emission bands located at 2.68, 2.83, 2.94, 3.11, 3.38, and 3.85 eV, which are likely associated with OSL-related recombination processes. The minimum detectable dose of 6.5 μGy was obtained for 1 % Al-doped LMP, which confirms that the material has potential as a UV–VIS emitting dosimetric phosphor.

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LiMgPO4: Al荧光粉OSL响应的研究

研究了LiMgPO4 （LMP）荧光粉的光激发发光（OSL）特性，以评估铝（Al）掺杂对其发光行为的影响，特别是对电离辐射的剂量响应和发射特性的影响。采用固相反应法制备了未掺杂LMP和掺杂不同浓度Al的晶体。利用扫描电子显微镜（SEM）和能量色散光谱（EDS）进行的结构和形态表征证实了Al有效且均匀地结合到晶格中，没有二次相或掺杂物偏析的证据。与未掺杂的样品相比，al掺杂样品在β-辐照下的连续波（CW-OSL）和线性调制（LM-OSL）发光响应显著增强。为了更深入地了解捕获和重组机制，对CW-OSL和LM-OSL信号进行了解卷积的一般阶动力学（GOK）模型。此外，在259 nm激发下的发射光谱测量显示了2.68、2.83、2.94、3.11、3.38和3.85 eV的6个不同的发射波段，这可能与oslr相关的重组过程有关。掺入1% al的LMP的最小检测剂量为6.5 μGy，证实了该材料具有作为紫外可见辐射剂量荧光粉的潜力。

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.