Controlled Hydrothermal Growth and Up-Conversion Emission of NaLnF4 (Ln = Y, Dy-Yb)

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• 作者：Jianle Zhuang ; Lifang Liang ; Herman H. Y. Sung ; Xianfeng Yang ; Mingmei Wu ; Ian D. Williams ; Shouhua Feng ; Qiang Su
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：June 25, 2007
• 年：2007
• 卷：46
• 期：13
• 页码：5404 - 5410
• 全文大小：213K
• 年卷期：v.46,no.13(June 25, 2007)
• ISSN：1520-510X

文摘

The controlled hydrothermal preparation of NaYF₄ as both cubic and hexagonal phase types with specific associatedmorphologies, nanospheres and microtubes, respectively, has been achieved in the absence of organic solvents.The hexagonal NaYF₄ compound can be prepared in novel microtubular form and directly co-doped with Yb³⁺/Er³⁺ions. When excited by infrared light of 980 nm, these hexagonal NaYF₄ microtubes display strong green up-conversion emission, which was much more intense than that of cubic NaYF₄ or hexagonal NaYF₄ nanoparticles.Other related hexagonal-prismatic microtubes of NaLnF₄ (Ln = Dy-Yb) were also synthesized. A growth mechanismfor the microtubes is proposed. In general, the diameter of the hexagonal NaLnF₄ microtubes is strongly dependenton the Ln³⁺ size and increases as the rare-earth ionic radius decreases.