Synthesis of lanthanide doped CeF3:Gd3+, Sm3+ nanoparticles, exhibiting altered luminescence after hydrothermal post-treatment
Synthesis of lanthanide doped CeF3:Gd3+, Sm3+ nanoparticles, exhibiting altered luminescence after hydrothermal post-treatment
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DOI：
10.1016/j.jallcom.2015.11.182
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发表时间：
2016-03
影响因子：
6.2
通讯作者：
M. Runowski;S. Lis
中科院分区：
文献类型：
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作者：
M. Runowski;S. Lis
采用简单的共沉淀法制备了一系列纳米晶（0.5~10 nm）的稀土掺杂氟化物CeF_3：Gd~（3+），Sm~（3+）。将所制备的纳米颗粒进行水热处理，这导致所形成的纳米晶体的结晶度和尺寸增加（约50 - 100 nm）。沉淀的产物（在水热处理之前）表现出粉红色发光。胶体纳米材料的水热后处理引起其发光的改变，即发射从粉红色调谐到橙子。这是因为在更大和更好结晶的纳米颗粒中，从Ce 3+和Gd 3+离子到Sm 3+离子（发光激活剂）的能量转移增加。在EDTA和柠檬酸的存在下获得的产品显示改变的形态，更均匀和单分散，以及。采用X射线粉末衍射（XRD）、透射电子显微镜（TEM）和红外光谱（FT-IR）对所合成的纳米材料的结构和形貌进行了表征。元素分析，热重-差热分析（TG-DTA）和能量色散X射线分析（EDX）证实了纳米材料的组成。根据激发/发射光谱和发射-衰减曲线研究了产物的发光性质。还确定了辐射寿命和发光量子产率。
The series of nanocrystalline (≈5–10 nm), lanthanide doped fluorides – CeF3:Gd3+, Sm3+were prepared by a simple coprecipitation method. The as-prepared nanoparticles were hydrothermally treated, which resulted in increased crystallinity and size of the nanocrystals formed (≈50–100 nm). The precipitated products (before the hydrothermal treatment) exhibited pink luminescence. The hydrothermal post-treatment of the colloidal nanomaterials caused alteration of their luminescence, namely the emission was tuned from pink to orange. This was because of the increased energy transfer from Ce3+and Gd3+ions to the Sm3+ion (luminescence activator), in larger and better crystallized nanoparticles. The products obtained in the presence of EDTA and citric acid revealed altered morphology, being more homogeneous and monodisperse, as well. The structural and morphological properties of the nanomaterials synthesized were determined by powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and infrared spectroscopy (FT-IR). Elemental analysis, thermogravimetric–differential thermal analysis (TG–DTA) and energy dispersive X-ray analysis (EDX) confirmed the nanomaterials composition. The luminescence properties of the products were studied based on the recorded excitation/emission spectra and emission–decay curves. Radiative lifetimes and luminescence quantum yields were also determined.