解锁 Li 和 Ce 离子对 MgB4O7 化合物的热释光和光激发光信号的影响,Dalton Transactions

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解锁 Li 和 Ce 离子对 MgB4O7 化合物的热释光和光激发光信号的影响
Dalton Transactions ( IF 3.5 ) Pub Date : 2023-04-05 , DOI: 10.1039/d3dt00485f
João V B Batista ₁ , Henrique Trombini ₁ , André Otsuka ₂ , Iury S Silveira ₃ , Linda V E Caldas ₃ , Antonio O de Souza ₄ , Adelmo S Souza ₄ , Jorge L O Santos ₄ , Vinicius Coelho ₄ , Heveson Lima ₅

Affiliation

四硼酸镁 (MgB ₄ O ₇ ) 是一种引起电离辐射剂量测定领域研究人员注意的材料示例。为了在发光剂量测定方面取得相当大的进步，存在一些挑战。在主体基质中掺入有效掺杂剂一直是一种实验上有用但有限的策略。缺乏关于引入的缺陷的具体信息以及它们与与光发射相关的捕获和重组过程的联系可以作为具有挑战性的例子被引用。_{在这里，我们展示了锂掺入对 MgB 4} O ₇的光激发光 (OSL)/热致发光 (TL) 信号修改/抑制的影响通过结合实验和计算程序。_{由于 MgO 中 F s}和 F _s⁺中心的可能猝灭以及 O'' _i的形成，Li 取代到 Mg 位置导致信号抑制，从而大大降低了 MgB ₄中 MgO 抗肖特基缺陷形成的可能性Ø ₇。当使用 Li-co-doped MgB ₄ O ₇ :Ce ³⁺时，Li 离子充当电荷平衡剂，促进 Ce 离子进入间隙孔隙，并可能对发光和剂量学特性产生积极的协同效应。这些发现为通过调整掺杂剂设计更高效的剂量计提供了新的见解。

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Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB4O7 compound

Magnesium tetraborate (MgB₄O₇) is an example of a material that has attracted the attention of researchers in the field of ionising radiation dosimetry. Several challenges are present in order to achieve considerable advances in luminescence dosimetry. The incorporation of efficient dopants in the host matrix has been an experimentally useful but limited strategy. The lack of specific information about the introduced defects as well as their connection with the trapping and recombination processes associated with light emission may be quoted as challenging examples. Here, we demonstrate the influence of lithium incorporation on Optically Stimulated Luminescence (OSL)/Thermoluminescence (TL) signal modification/suppression of MgB₄O₇ by combining experimental and computational procedures. Li substitution into the Mg site leads to a signal suppression due to the probable quenching of the F_s and F_s⁺ centres in MgO and the formation of O′′_i, drastically reducing the possibility of MgO anti-Schottky defect formation in MgB₄O₇. When using Li-co-doped MgB₄O₇:Ce³⁺, the Li ions act as a charge balancer, facilitating the entry of Ce ions into the interstitial pores and making possible a positive synergistic effect on the luminescence and dosimetric properties. These findings provide new insights into designing more efficient dosimeters by tuning dopants.

更新日期：2023-04-05

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