Structural and optical properties of cobalt doped ZnO nanocrystals

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• 作者：Meihui Li ; Jianping Xu ; Ximing Chen ; Xiaosong Zhang ; Yanyu Wu ; Ping Li ; Xiping Niu ; Chengyuan Luo ; Lan Li
• 关键词：ZnO nanocrystal ; Co doping ; Optical property
• 刊名：Superlattices and Microstructures
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：52
• 期：4
• 页码：824-833
• 全文大小：1172 K

文摘

Zn_1?xCo_xO nanocrystals with nominal Co doping concentrations of x = 0-0.1 were synthesized through a simple solution route followed by a calcining process. The doping effects on the structural, morphological and optical properties were investigated by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman, absorption and luminescence spectroscopy. The results indicated that a small amount of Co ions were incorporated into ZnO lattice structure, whereas the secondary phase of Co₃O₄ was segregated and precipitated at high Co doping concentrations, the solid solubility of Co ions in ZnO nanocrystals could be lower than 0.05. The spectra related to transitions within the tetrahedral Co²⁺ ions in the ZnO host crystal were observed in absorption and luminescence spectra.