Up-conversion luminescence of Er^3+ doped and Er^3+/Yb^3+ co-doped YTaO4 |
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作者姓名: | PANG Tao CAO WangHe |
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作者单位: | Optoelectronic Technology Institute, Dalian Maritime University, Dalian 116026, China |
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基金项目: | Supported by the National Natural Science Foundation of China (Grant No. 10374011) |
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摘 要: | The synthesis and up-conversion luminescent properties of YTaO4:Er^3+ and YTaO4:Er^3+/Yb^3+ are reported for the first time. According to the measurement results of up-conversion spectra, Yb^3+ co-doping can remarkably enhance the green (^2H11/2/^4S3/2→^4I15/2) and red (^4F9/2→^4I15/2) emissions, but depress the infrared emission (^4I9/2→^4I15/2). With the increase of the Yb^3+ concentration, the intensity of green emission increases, after that, when the Yb^3+ concentration increases continuously, the intensity of green emission decreases, while those of the red and infrared emissions increase and decrease alternately. In addition, the up-conversion mechanisms of Er^3+ doped and Er^3+/Yb^3+ co-doped YTaO4 are also discussed. It is found that the transform of up-conversion mechanism from two-step energy transfer to cooperating sensitization takes place when Yb^3+ concentration is increased up to 12 mol%. With the further increase of Yb^3+ concentration, the energy-back-transfer gradually becomes the dominant up-conversion mechanism, which results in the quenching of the green emission and slight increasing of the red and infrared emissions.
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关 键 词: | 上升转换率 能量转换 协同感光 能量回转 |
收稿时间: | 9 January 2007 |
修稿时间: | 21 July 2007 |
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