Microstructure and upconversion luminescence in Ho³⁺ and Yb³⁺ co-doped ZnO naocrystalline powders

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• 作者：Xiaochen Yu ; Shaowei Liang ; Zhongwang Sun ; Yingwei Duan ; Yanbin Qin ; Li Duan ; Huiyun Xia ; Peng Zhao ; Donglin Li
• 关键词：Upconversion luminescence ; ZnO ; Holmium ; Ytterbium
• 刊名：Optics Communications
• 出版年：15 February, 2014
• 年：2014
• 卷：313
• 期：Complete
• 页码：90-93
• 全文大小：1043 K

文摘

The Ho³⁺/Yb³⁺ co-doped ZnO nanocrytalline powders were fabricated by a facile hydrothermal route. The structure and morphology of the samples were studied by XRD and SEM, respectively. The upconversion luminescence properties of the Ho³⁺/Yb³⁺ co-doped ZnO samples were investigated under 980 nm excitation. The upconversion emission bands centered at 545 and 660 nm corresponding to ⁵F₄+⁵S₂鈫?sup>5I₈ and ⁵F₅鈫?sup>5I₈ transitions of Ho³⁺ ion, respectively, were observed. The dependence of the upconversion emission intensity upon the Yb³⁺ ions concentration was also examined. Power studies revealed that a two-photon process was involved in the upconversion emissions and the possible upconversion mechanisms were discussed.