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首页> 外文期刊>Physica, B. Condensed Matter >Influence of excitation light on the frequency upconversion of trivalent lanthanide ions
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Influence of excitation light on the frequency upconversion of trivalent lanthanide ions

机译：激发光对三价镧系离子频率上转换的影响

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摘要

The upconversion mechanisms of the ~1D_2 level of Tm~3 ion under different excitation lights were analyzed. The influences of the excitation lights on the upconversion process, nonradiative relaxation from level ~3F_2 to ~3H_4 and fluorescence properties were investigated. It was shown that the one-color cw excitation could affect the profile of fluorescence, while information of the nonradiative relaxation could not be extracted. The nonradiative relaxation rate measured with the one-color pulsed excitation in crystal phase was in agreement with what was obtained in the free-standing nanometer crystal particles through the two-color pulsed excitation. The characteristics of the fluorescent emissions of Tm~3 ions doped in various host materials were also discussed under different excitation lights. As a result of the discussion, a possible way to obtain nonradiative relaxation rate directly from a spectroscopic method in frequency domain was proposed. The study can be extended to other trivalent lanthanide ions that have upconversion through excited state absorption.
机译：分析了不同激发光下Tm〜3离子〜1D_2能级的上转换机理。研究了激发光对上转换过程，〜3F_2到〜3H_4能级的非辐射弛豫以及荧光性质的影响。结果表明，单色连续激发可以影响荧光的分布，而不能提取非辐射弛豫的信息。用晶体相中的一种颜色脉冲激发测量的非辐射弛豫率与通过该两种颜色脉冲激发在独立的纳米晶体颗粒中获得的一致。还讨论了在不同激发光下，掺杂在各种基质材料中的Tm〜3离子的荧光发射特性。讨论的结果是，提出了一种直接从光谱方法获得频域非辐射弛豫率的可能方法。该研究可以扩展到通过激发态吸收具有上转换的其他三价镧系离子。

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