| Li+共掺杂对Er3+-Yb3+∶TiO2紫外、可见和红外发光同步增强研究(英文) |
| Simultaneous Enhanced Ultraviolet, Visible and Infrared Emissions in Er3+-Yb3+∶TiO2 by Li+ Codoping |
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| 摘要: 采用溶胶-凝胶(Sol-gel)法制备了Li+共掺杂的Er3+-Yb3+∶TiO2粉末。976 nm激光激发下在波长350~1700 nm范围内观察到了紫外、蓝色、绿色和红色上转换发光和红外下转换发光。随着Li+共掺杂浓度由0增大到20mol%，Er3+-Yb3+∶TiO2的紫外、可见和红外发光强度同步增强。低Li+共掺杂浓度引起的Li+固溶以及高Li+共掺杂浓度引起的相变过程相继破坏了Er3+的晶体场对称性，导致紫外、可见和红外发光显著增强。结果表明共掺杂Li+是一种提高Er3+掺杂材料发光性能的有效方法。 |
| 关键词: Er3+-Yb3+∶TiO2 Li+共掺杂 紫外、可见和红外发光 晶体场对称性 |
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| Abstract: The Er3+-Yb3+∶TiO2 powders by Li+ codoping have been prepared by sol-gel method. Both ultraviolet, blue, green and red upconversion and infrared downconversion emissions in the wavelengths of 350~1 700 nm were observed by a 976 nm semiconductor laser diode (LD) excitation. The ultraviolet, visible and infrared emissions of Er3+-Yb3+∶TiO2 enhanced simultaneously by increasing Li+ from 0 to 20mol%. The significant enhancement of ultraviolet, visible and infrared emissions resulted from the distortion of crystal field symmetry of Er3+ caused by the dissolving of Li+ at lower Li+ codoping concentration and the phase transformation at higher Li+ concentration. It can be concluded that codoping with Li+ is an efficient method to enhance the luminescence of Er3+ doped materials. |
| Keywords: Er3+-Yb3+∶TiO2 Li+ codoping ultraviolet, visible and infrared emissions crystal field symmetry |
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| 曹保胜,何洋洋,冯志庆,宋 苗,董 斌.Li+共掺杂对Er3+-Yb3+∶TiO2紫外、可见和红外发光同步增强研究(英文)[J].无机化学学报,2011,27(4):776-780. |
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