Department of Physics, Annamalai University, Annamalai Nagar, Chidambaram, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Dec;116:311-6. doi: 10.1016/j.saa.2013.07.031. Epub 2013 Jul 27.
Zn(1-x)Mg(x)O nanocrystals with various compositions (x = 0-0.1) were synthesised by sol-gel process using tri ethanol amine (TEA) as a capping agent. The structural properties of the prepared materials were studied by X-ray diffraction analysis. Un-agglomerated nanocrystals with spherical morphology were observed by scanning electron microscope (SEM). The presence of Mg in the Zn(1-x)Mg(x)O was confirmed by X-ray photoelectron spectroscopy (XPS). Moreover, the Mg composition relatively increases in the synthesised nanocrystals as it increases in the precursor solution. The optical absorption studies of the Zn(1-x)Mg(x)O samples show the blue shift from the pure ZnO due to the incorporation of Mg in ZnO lattice. The photoluminescence studies demonstrated that the intensity of defect related deep level emission increases drastically with increasing the x value from 0.02 to 0.08 and decreases sharply on further increase of Mg from 0.08 to 0.1. The mechanism for the enhanced green emission was explained based on the structural properties of the Zn(1-x)Mg(x)O samples.
采用溶胶-凝胶法，以三乙醇胺（TEA）为封端剂，合成了不同组成（x=0-0.1）的Zn(1-x)Mg(x)O 纳米晶。采用 X 射线衍射分析研究了所制备材料的结构性能。通过扫描电子显微镜（SEM）观察到无团聚的球形纳米晶。X 射线光电子能谱（XPS）证实了 Mg 存在于 Zn(1-x)Mg(x)O 中。此外，随着前驱体溶液中 Mg 的增加，合成纳米晶中 Mg 的组成相对增加。Zn(1-x)Mg(x)O 样品的光吸收研究表明，由于 Mg 掺入 ZnO 晶格，与缺陷相关的深能级发射的蓝移。光致发光研究表明，随着 x 值从 0.02 增加到 0.08，缺陷相关的深能级发射强度急剧增加，而当 x 值从 0.08 增加到 0.1 时，强度急剧下降。基于 Zn(1-x)Mg(x)O 样品的结构性能，解释了增强绿光发射的机制。
