Temperature-dependent phase evolution of the Gd3+ doped strontium compounds: Structural and optical properties

IF 3 Q3 Physics and Astronomy

Results in Optics Pub Date : 2025-09-22 DOI:10.1016/j.rio.2025.100895

C. Dlamini , M.R. Mhlongo , V.M. Maphiri , T.D. Malevu , L.F. Koao , T.E. Motaung , T.T. Hlatshwayo , S.V. Motloung

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Abstract

Mixed-phases of the SrCO₃/Sr₃Al₂O₆/SrAl₂O₄/SrAl₄O₇/SrAl₁₂O₁₉ (hereafter called SSSSS) doped with Gd³⁺ (SSSSS: 0.05 % Gd³⁺) nanopowders were prepared using the citrate sol–gel method. The effect of annealing temperature (T_a) on the structure, morphology, and photoluminescence (PL) properties was investigated. The T_a was varied in a range of 600–1300 °C, while the dopant concentration was kept constant at 0.05 % Gd³⁺. X-ray diffraction (XRD) results revealed that the prepared nanopowders consist of a mixture of orthorhombic (SrCO₃), cubic (Sr₃Al₂O₆), monoclinic (SrAl₂O₄ and SrAl₄O₇), and hexagonal SrAl₁₂O₁₉ structures. It was noted that increasing the phase composition depends on the T_a. The Fourier-transform infrared spectroscopy (FTIR) shows several peaks at around 529, 874, 1181, 1442, 2947, and 3421 cm⁻¹. The Energy dispersive spectroscopy (EDS) confirmed the elementary composition of the Sr, C, O, and Al. The scanning electron microscope (SEM) images showed that the phase composition highly depends on the T_a. Transmission electron microscope (TEM) showed that the particle sizes are in the nanoscale. The ultraviolet–visible (UV–vis) diffuse reflection spectroscopy results showed that the absorption peaks below 300 nm are influenced by the T_a. The PL results showed three emission peaks located around 431, 541, and 657 nm when excited at 272 nm. These emission peaks were attributed to SrCO₃, SrAl₂O₄, and Sr₃Al₂O₆ crystal lattice, respectively. The results showed that the luminescence intensity and lifetime of the prepared samples depends on the T_a. The chromaticiy coordinate showed that all samples emit in a blue region and the color purity was influenced by the T_a.

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Gd3+掺杂锶化合物的温度依赖性相演化：结构和光学性质

采用柠檬酸溶胶-凝胶法制备了掺杂Gd3+ (SSSSS: 0.05% Gd3+)纳米粉体的SrCO3/Sr3Al2O6/SrAl2O4/SrAl4O7/SrAl12O19（以下简称SSSSS）混合相。研究了退火温度（Ta）对材料结构、形貌和光致发光性能的影响。Ta在600 ~ 1300℃范围内变化，而掺杂剂浓度保持在0.05% Gd3+不变。x射线衍射（XRD）结果表明，制备的纳米粉体由正交（SrCO3）、立方（Sr3Al2O6）、单斜（SrAl2O4和SrAl4O7）和六方（SrAl12O19）结构组成。注意到相组成的增加取决于Ta。傅里叶变换红外光谱（FTIR）显示在529、874、1181、1442、2947和3421 cm−1附近有几个峰。能谱分析（EDS）证实了Sr、C、O和Al的基本组成，扫描电镜（SEM）图像表明，相组成高度依赖于Ta。透射电子显微镜（TEM）分析表明，所制备的颗粒尺寸为纳米级。紫外-可见（UV-vis）漫反射光谱结果表明，在300 nm以下的吸收峰受Ta的影响。当激发波长为272 nm时，发光峰分别位于431,541和657 nm附近。这些发射峰分别属于SrCO3、SrAl2O4和Sr3Al2O6晶格。结果表明，制备的样品的发光强度和寿命取决于Ta的含量。色度坐标显示所有样品都在蓝色区域发光，颜色纯度受Ta的影响。

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