Structure and upconversion luminescence properties of BaYF₅:Yb³⁺, Er³⁺ nanoparticles prepared by different methods

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• 作者：Haiyan Du^a ; Weihang Zhang^a ; Jiayue Sun ; ^a ; ^{jiayue_sun@126.com}
• 关键词：Upconversion ; Fluoride source ; Co-precipitation technique ; Hydrothermal synthesis
• 刊名：Journal of Alloys and Compounds
• 出版年：2011
• 出版时间：17 February 2011
• 年：2011
• 卷：509
• 期：7
• 页码：3413-3418
• 全文大小：784 K

文摘

BaYF₅:Yb³⁺, Er³⁺ (BYF) upconversion (UC) luminescence nanoparticles have been prepared using co-precipitation and hydrothermal techniques, respectively. Two different fluoride sources were used to synthesize BYF by the hydrothermal method, and the sizes of the as-prepared spherical particles were about 30 nm (NH₄BF₄ as a fluoride source) and 100 nm (NH₄HF₂ as a fluoride source), respectively. While the nanoparticles prepared by the co-precipitation method are irregular, many clusters and agglomerates can be seen. The UC fluorescence has been realized in all the as-prepared BYF samples upon 980 nm excitation. It is found that their luminescence spectra depend strongly upon the preparation method. Factors affecting the upconversion fluorescent intensity have been also studied. The UC emission transitions for ⁴F_9/2–⁴I_15/2 (red), ²H_11/2–⁴I_15/2 (green) and ⁴S_3/2–⁴I_15/2 (green) in the Yb³⁺/Er³⁺ codoped BYF nanoparticles depending on pumping power have also been discussed.