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1. 西北大学 光子学与光子技术研究所, 陕西 西安 710069
2. 上海大学 纳米化学与生物学研究所, 上海 201800
收稿:2009-10-09,
修回:2010-1-21,
网络首发:2010-08-27,
纸质出版:2010-08-27
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景 磊, 潘登余, 任兆玉, 冯娟娟, 郑继明. Mg掺杂ZnO纳米晶的低温共沉淀法制备及光学性质[J]. 发光学报, 2010,31(4): 561-567
JING Lei, PAN Deng-yu, REN Zhao-yu, FENG Juan-juan, ZHENG Ji-ming. Luminescent Property of Mg Doped ZnO Nanocrystals Synthesized by Co-precipitation at Low Temperature[J]. 发光学报, 2010,31(4): 561-567
采用共沉淀(co-precipitation)法制备了Mg掺杂ZnO纳米晶
分别用X射线衍射(XRD)、傅立叶变换红外光谱(FTIR)、紫外可见吸收(UV-Vis)光谱、光致发光(PL)光谱、透射电镜(TEM)、电子顺磁共振(EPR)等分析手段对样品进行了表征。探究了Mg离子在ZnO纳米晶中的存在状态
ZnO纳米晶颗粒尺寸和发射光谱随Mg掺杂浓度的变化
并对其发光机理进行了分析。结果表明:Mg离子在ZnO晶格中以部分晶格位
部分间隙位的方式存在
没有形成MgO表面壳层结构;随Mg掺杂浓度的增大
ZnO纳米晶的颗粒尺寸变小
发射光的光强增大。发射光的最佳激发波长为342 nm
中心波长为500 nm
荧光量子产率为22.8%。实验分析表明:Mg离子的掺杂在ZnO纳米晶中引入了锌空位(V
Zn
)
间隙位的镁离子(I
Mg
)
提供了新的复合中心
从而增强了ZnO纳米晶的光致发光。
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