Near-infrared to visible up-conversion emissions of Er^3+ doped Al2O3 powders derived from the sol-gel method |
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作者姓名: | DONG Bin GAO YaChen XU XueSong SUN Min LI Lei |
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作者单位: | [1]School of Science, Dalian Nationalities University, Dalian 116600, China [2]School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China [3]Colleae of Electronic Enaineerincl, Heiloncliiancl University, Harbin 150080, China3 College of Electronic Engineering, Heilongjiang University, Harbin 150080, China [4]Department of Physics, Dalian Maritime University, Dalian 116029, China |
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基金项目: | We acknowledge the technical assistance of T. Yang, H. Wang, and Z. H. Zhu in this research. |
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摘 要: | The Er3 doped Al2O3 powders were prepared by the sol-gel method using the aluminium isopropoxide Al(OC3H7)3]-derived Al2O3 sols with addition of the erbium nitrate Er(NO3)3.5H2O]. The different phase structure, including three crystalline types of (Al,Er)2O3 phases, γ, θ, α, and two Er-Al-O phases, ErAlO3 and Al10Er6O24, was obtained with the 1 mol% Er3 doped Al2O3 powders at the different sintering temperatures of 600―1200℃. The green and red up-conversion emissions centered at about 523, 545 and 660 nm, corresponding respectively to the 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3 , were detected by a 978 nm semiconductor laser diodes excitation. The phase structure and OH content had evident influence on the up-conversion emissions intensity. The maximum intensities of both the green and red emissions were obtained respectively for the Er3 doped Al2O3 powders sintered at 1200 ℃, which was composed mainly of α-(Al,Er)2O3, less of ErAlO3 and Al10Er6O24 phases, and with the least OH content. The two-photon absorption up-conversion process was involved in the green and red up-conversion emissions of the Er3 doped Al2O3 powders.
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关 键 词: | 铒添加剂 Al2O3 吸收作用 红外线 十字延伸 |
收稿时间: | 30 June 2007 |
修稿时间: | 2007-06-30 |
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