Concentration dependence of visible up-conversion luminescence in the laser crystal Gd₃Ga₅O₁₂ doped with erbium

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• 作者：Chen ; Xuesheng ; Nguyen ; Timothy ; Luu ; Qui ; Bartolo ; B. Di
• 关键词：Erbium ; Gd₃Ga₅O₁₂ ; Up-conversion
• 刊名：Journal of Luminescence
• 出版年：2000
• 出版时间：January, 2000
• 年：2000
• 卷：85
• 期：4
• 页码：295-299
• 全文大小：123 K

文摘

The concentration dependence of the near infrared to visible up-conversion (anti-Stokes) luminescence was investigated in the laser crystal Gd₃Ga₅O₁₂ (GGG) doped with Er ions at three different concentrations, 1 % , 10 % and 30 % . We found that when the crystals were pumped by an infrared (790 nm) diode laser, both the red and green up-conversion luminescence become much stronger with increasing Er concentration; the red emission becomes stronger by a greater factor. In fact, the red up-conversion luminescence was found to be weak in the 1 % -Er-doped GGG and strong in the 30 % -Er-doped GGG. The down-conversion (Stokes) luminescence shown by these crystals, when pumped by a blue argon laser, was also investigated and compared with the up-conversion luminescence. We believe that the main mechanism responsible for the up-conversion in Er-doped GGG is of the Energy Transfer Up-conversion (ETU) type, especially in 10 % and 30 % -Er-doped GGG.