燃料：影响 CaAl2O4: Dy 荧光粉发光特性的关键因素

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER The European Physical Journal B Pub Date : 2024-10-16 DOI:10.1140/epjb/s10051-024-00799-w

Kabita Ku. Satapathy, Satya N. Tripathy

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摘要

大多数市售荧光粉都是由适当掺杂的多晶材料制成的，虽然活化方法经常被研究，但燃料对宿主制备的影响及其对产品最终性能的影响却较少受到关注。本文探讨了掺镝 CaAl2O4 荧光粉合成过程中各种燃料的使用。在低温（500 °C）下，通过燃烧相应的金属硝酸盐-燃料混合物，在 5 分钟内获得了掺镝的单斜 CaAl2O4 荧光粉。本文关注的是燃料对溶液燃烧法制备的荧光粉样品发光特性的影响。以肼、碳肼和尿素为燃料，通过燃烧技术合成了二活化 CaAl2O4 荧光粉。XRD 分析表明，在原料中引入少量稀土离子不会改变 CaAl2O4 的晶体结构。XRD 结果证实了样品的形成。光致发光（PL）发射光谱显示了 CaAl2O4 样品中掺杂 Dy 的发射特征。在 Dy 浓度为 0.02 mol% 时，光致发光强度最高。当在 347 纳米波长处激发时，PL 光谱在 488 和 573 纳米波长附近显示出较宽的峰值。材料的机械发光（ML）和热发光（TL）特性也得到了强调。记录了各种 ML 和 TL 曲线，以评估哪种燃料产生的 CaAl2O4: Dy 复合物效率最高。制备的样品可用于 TL 剂量测定。本研究发现，尿素是制备 CaAl2O4: Dy 荧光粉的一种更好的燃料，可以增强样品的 ML 和 TL 强度。尿素、碳酰肼和肼合成的 CaAl2O4: Dy 荧光粉的图形抽象PL 发射光谱显示，尿素的 PL 强度最高，是增强光学性能的最佳选择。

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Fuels: a key factor to influence the luminescence properties of CaAl2O4: Dy phosphors

Most commercially available phosphors are made from appropriately doped polycrystalline materials while the activation methods have often been examined, the impact of fuels on the host preparation and its effect on the final performance of the products has received less focus. This paper explores the use of various fuels in the synthesis of Dy-doped CaAl₂O₄ phosphors. Dysprosium-doped monoclinic CaAl₂O₄ phosphors were obtained at low temperatures (500 °C) by the process of combustion of the corresponding metal nitrate–fuel mixtures, over a period of 5 min. In this paper, attention has been paid to the influence of fuels on the luminescence properties of the phosphor sample which is prepared by solution combustion method. Dy-activated CaAl₂O₄ phosphor was synthesized by combustion technique using hydrazine, carbohydrazide, and urea as fuels. XRD analysis reveals that introducing a small quantity of rare earth ions into the raw materials did not alter the crystal structure of CaAl₂O₄. XRD result confirms the formation of the sample. Photoluminescence (PL) emission spectrum showed characteristic emission of Dy doped in the CaAl₂O₄ samples. The highest photoluminescence intensity was observed at a 0.02 mol% concentration of Dy. The PL spectrum exhibits wide peaks near 488 and 573 nm when excited at 347 nm. Mechanoluminescence (ML) and Thermoluminescence (TL) properties of the material have been emphasized. Various ML and TL curves have been recorded to assess which of the fuels yields the most efficient CaAl₂O₄: Dy compound. The prepared sample may be useful in TL dosimetry. In the present investigation it is found that urea is a better fuel for preparing CaAl₂O₄: Dy phosphors and enhances the ML and TL intensity of the sample.

Graphical abstract

PL emission spectra of CaAl2O4: Dy phosphors synthesized by urea, carbohydrazide and hydrazine, where urea provides the highest PL intensity, making it an optimal choice for enhancing optical performance.

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