Highly Uniform Tm3+-Doped NaYbF4 Microtubes: Controlled Synthesis and Intense Ultraviolet Photoluminescence

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• 作者：Songjun Zeng ; Guozhong Ren ; Wen Li ; Changfu Xu ; Qibin Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：June 24, 2010
• 年：2010
• 卷：114
• 期：24
• 页码：10750-10754
• 全文大小：406K
• 年卷期：v.114,no.24(June 24, 2010)
• ISSN：1932-7455

文摘

Here, we present a facile and controlled synthesis of high-quality and uniform hexagonal phase NaYbF₄ microtubes by a rational hydrothermal method. In addition, highly uniform and monodisperse NaYbF₄ nanospheres and nanocubes are synthesized by simply tuning the reaction parameters, including sodium fluoride content, reaction temperature and reaction time. Under excitation with a 980 nm laser diode, intense ultraviolet (UV) and blue upconversion emissions were achieved from a single dopant ion (Tm³⁺) in NaYbF₄. The effect of the crystal phase on the upconversion emission properties is also investigated. The results demonstrate that upconversion emission intensities from hexagonal phase NaYbF₄ microtubes are much more efficient than the nanocubes by 2 orders of magnitude. These microtubes with unique upconvertion emissions demonstrate that NaYbF₄ is an excellent host material, as compared with some of its other fluoride and oxide counterparts, and that it may find applications in UV and visible solid-state lasers or the fiber lasers.