Upconversion luminescence of Y₂O₃:Er³⁺, Yb³⁺ nanoparticles prepared by a homogeneous precipitation method

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• 作者：Yanhong LI ; Yongming ZHANG ; Guangyan HONG ; Yingning YU
• 关键词：homogeneous precipitation method ; Y₂O₃ ; Er³⁺ ; Yb³⁺ nanoparticles ; upconversion luminescence ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：26
• 期：3
• 页码：450-454
• 全文大小：569 K

文摘

Y₂O₃: Er³⁺, Yb³⁺ nanoparticles were synthesized by a homogeneous precipitation method without and with different concentrations of EDTA 2Na. Upconversion luminescence spectra of the samples were studied under 980 nm laser excitation. The results of XRD showed that the obtained Y₂O₃:Er³⁺,Yb³⁺ nanoparticles were of a cubic structure. The average crystallite sizes calculated were in the range of 28–40 nm. Green and red upconversion emission were observed, and attributed to ²H_11/2,⁴S_3/2 → ⁴I_15/2 and ⁴F_9/2 → ⁴I_15/2 transitions of the Er³⁺ ion, respectively. The ratio of the intensity of green emission to that of red emission drastically changed with a change in the EDTA 2Na concentration. In the sample synthesized without EDTA, the relative intensity of the green emission was weaker than that of the red emission. The relative intensities of green emission increased with the increased amount of EDTA 2Na used. The possible upconversion luminescence mechanisms were discussed.