Polyol-mediated syntheses and characterizations of NaYF₄, NH₄Y₃F₁₀ and YF₃ nanocrystals/sub-microcrystals

详细信息    查看全文

• 作者：Ruifei Qin ; Hongwei Song ; Guohui Pan ; Lanying Hu ; Hongquan Yu ; Suwen Li ; Xue Bai ; Libo Fan ; Qilin Dai ; Xinguang Ren ; Haifeng Zhao ; Tie Wang
• 关键词：A. Fluorides ; B. Nanostructures ; C. Luminescence
• 刊名：Materials Research Bulletin
• 出版年：2008
• 出版时间：4 August 2008-4 September 2008
• 年：2008
• 卷：43
• 期：8-9
• 页码：2130-2136
• 全文大小：594 K

文摘

In this paper, NaYF₄ nanocrystals and NH₄Y₃F₁₀sub-microcrystals were prepared using a polyol method. After being annealed, NH₄Y₃F₁₀ can convert into YF₃, which is a very efficient host matrix for upconversion. The structures of obtained NaYF₄, NH₄Y₃F₁₀ and YF₃ samples are pure cubic phase, a mixture of cubic and hexagonal phase and pure orthorhombic phase, respectively. The size of obtained NaYF₄ nanocrystals is about 20 nm, and those of NH₄Y₃F₁₀ and YF₃ sub-microcrystals are both about 200 nm. When co-doped with Er³⁺ and Yb³⁺, NaYF₄ and YF₃ samples can emit bright light under 978 nm excitation. Upconversion mechanisms in Yb³⁺/Er³⁺ co-doped NaYF₄ and YF₃ samples were discussed.