Energy transfer and frequency upconversion in Er³⁺-Yb³⁺ codoped oxy-fluoro-tungstosilicate glasses

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• 作者：Guangtao JIE ; Gaoling ZHAO ; ^{glzhao@zju.edu.cn} ; Jianxun WANG ; Gaorong HAN
• 关键词：oxy-fluoro-tungstosilicate ; rare earth ions ; upconversion luminescence ; glass
• 刊名：Journal of Rare Earths
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：30
• 期：5
• 页码：422-425
• 全文大小：410 K

文摘

Er³⁺-Yb³⁺ codoped oxy-fluoro-tungstosilicate glasses with infrared-to-visible frequency upconversion luminescence were prepared by melting quenching in air. The effects of Er³⁺ doping on the optical properties of the samples were measured by means of techniques such as optical absorption spectra and photoluminescence spectra. The results showed that intense green and red signals centered at 546 and 665 nm, corresponding to the ⁴S_3/2?sup>4I_15/2 and ⁴F_9/2?sup>4I_15/2 transitions of Er³⁺ by a multiphoton stepwise phonon-assisted excited-state absorption process, respectively, were simultaneously observed by exciting the samples with a diode laser operating at 980 nm at room temperature. The upconversion process was found very sensitive to Er³⁺ content at a constant Yb₂O₃ content of 5 mol. % . With the increase of Er³⁺ content from 0.5 % to 1.5 % , the upconversion intensity increased gradually. Further increasing of Er³⁺ content to 3.0 % resulted in a significant fluorescence quenching. Moreover, the possible upconversion mechanisms were discussed based on the energy-matching conditions and the quadratic dependence on excitation power.