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首页> 外文期刊>Solid State Communications >Comparative investigation of up-conversion luminescence in Tm3+/Yb3+-codoped germanate-niobic and germanium-bismuth glasses: effect of phonon density on up-conversion emission
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Comparative investigation of up-conversion luminescence in Tm3+/Yb3+-codoped germanate-niobic and germanium-bismuth glasses: effect of phonon density on up-conversion emission

机译：Tm3 + / Yb3 +掺杂的锗酸铌玻璃和锗铋玻璃中上转换发光的比较研究：声子密度对上转换发射的影响

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摘要

Tm3+/Yb3+-codoped gernianate-niobic (GN) and germanium-bismuth (GB) glasses have been synthesized by conventional ruching and quenching method. Intense blue and weak red emissions centered at 477 and 650 nm, corresponding to the transitions (1)G(4)->H-3(6) and (1)G(4)->H-3(4), respectively, were observed at room temperature. The possible Up-conversion mechanisms are discussed and estimated. GN glass showed a weaker up-conversion emission than GB glass, which is inconsistent with the prediction from the difference of maximum phonon energy between GN and GB glasses. In this paper, Raman spectroscopy was employed to investigate the origin of the difference in up-conversion luminescence in the two glasses. Compared with phonon side-band spectroscopy, Raman spectroscopy extracts more information including both phonon energy and phonon density. For the first time, our results reveal that, besides the maximum phonon energy, the phonon density of host glasses is also an important factor in determining the up-conversion efficiency. (c) 2005 Elsevier Ltd. All rights reserved.
机译：采用常规的淬火和淬火方法合成了掺有Tm3 + / Yb3 +的锗酸铌（GN）玻璃和锗铋（GB）玻璃。强烈的蓝色和弱红色发射集中在477和650 nm处，分别对应于过渡（1）G（4）-> H-3（6）和（1）G（4）-> H-3（4）在室温下观察到。讨论并估计了可能的上转换机制。 GN玻璃的上转换辐射比GB玻璃弱，这与GN和GB玻璃之间最大声子能量差的预测不一致。在本文中，拉曼光谱被用来研究两种玻璃的上转换发光差异的起源。与声子边带光谱法相比，拉曼光谱法可提取更多信息，包括声子能量和声子密度。我们的结果首次显示，除了最大声子能量以外，主体玻璃的声子密度也是决定上转换效率的重要因素。 （c）2005 Elsevier Ltd.保留所有权利。

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