Upconversion emissions in Yb3+–Tm3+-doped tellurite glasses excited at 976?nm

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• 作者：Guonian Wang ; Shixun Dai ; Junjie Zhang ; Jianhu Yang and Zhonghong Jiang
• 刊名：Journal of Materials Science
• 出版年：2007
• 出版时间：February, 2007
• 年：2007
• 卷：42
• 期：3
• 页码：747-751
• 全文大小：189 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

Intense Tm3+ blue upconversion emission has been observed in Tm3+–Yb3+ codoped oxyfluoride tellurite glass under excitation with a diode laser at 976 nm. Three emission bands centered at 475, 650 and 796 nm corresponding to the transitions 1G₄→ 3H₆, 1G₄→ 3H₄ and 3F₄→ 3H₆, respectively, simultaneously occur. The dependence of upconversion intensities on Tm3+ ions concentration and excitation power are investigated. For fixed Yb₂O₃ concentrations of 5.0 mol%, the maximum upconversion intensity was obtained with Tm₂O₃ concentration of about 0.1 mol%. The blue upconversion luminescence lifetimes of the Tm3+ transitions 1G₄→ 3H₆ are measured. The results are evaluated by the possible upconversion mechanisms.