School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.
School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Mar 25;122:624-30. doi: 10.1016/j.saa.2013.11.080. Epub 2013 Nov 20.
Nanostructured samarium oxalate crystals were prepared via microwave assisted co-precipitation method. The crystal structure and morphology of the sample were analyzed using X-ray powder diffraction, Scanning electron microscopy and Transmission electron microscopy. The presence of functional groups is ascertained by Fourier transform infrared spectroscopy. Samarium oxalate nanocrystals of average size 20 nm were aggregated together to form nano-plate structure in sub-microrange. Detailed spectroscopic investigation of the prepared phosphor material was carried out by Judd-Ofelt analysis based on the UV-Visible-NIR absorption spectra and photoluminescence emission spectra. The analysis reveals that the transition from energy level (4)G5/2 to (6)H7/2 of Sm(3+) ion has maximum branching ratio and the corresponding orange emission can be used for display applications.
通过微波辅助共沉淀法制备了纳米结构的草酸钐晶体。采用 X 射线粉末衍射、扫描电子显微镜和透射电子显微镜对样品的晶体结构和形态进行了分析。通过傅里叶变换红外光谱确定了官能团的存在。草酸钐纳米晶的平均尺寸为 20nm，聚集在一起形成亚微米级的纳米板结构。通过基于紫外可见近红外吸收光谱和光致发光发射光谱的 Judd-Ofelt 分析，对制备的荧光粉材料进行了详细的光谱研究。分析表明，Sm(3+)离子从能级（4）G5/2到（6）H7/2的跃迁具有最大分支比，相应的橙色发射可用于显示应用。
