Er3+ luminescence and cooperative upconversion in ErxY2−xSiO5 nanocrystal aggregates fabricated using Si nanowires
Er3+ luminescence and cooperative upconversion in ErxY2−xSiO5 nanocrystal aggregates fabricated using Si nanowires
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DOI：
10.1063/1.2890414
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发表时间：
2008-03
影响因子：
4
通讯作者：
K. Suh;Jung H. Shin;Seok-Jun Seo;B. Bae
中科院分区：
文献类型：
--
作者：
K. Suh;Jung H. Shin;Seok-Jun Seo;B. Bae
研究了用Si纳米线制备的ErxY 2 − xSiO 5纳米聚集体中Er 3+的发光和合作上转换。X射线衍射和光致发光光谱表明，最终的纳米晶体的组成可以连续变化，从纯Y2 SiO 5到纯Er 2SiO 5，同时保持相同的晶体结构。对Er 3+光致发光强度和衰减时间的浓度和泵浦功率依赖性的分析表明，虽然在高Er浓度下发生合作上转换，但在Er浓度为1.2× 1021 cm-3时，合作上转换系数仅为（2.2±1.1）×10 - 18 cm-3 scins。这在Er浓度比从Er掺杂的二氧化硅报道的Er浓度高十倍以上的情况下低近十倍，并且证明了将这种硅酸盐用于Si光子学的紧凑、高增益Si基光学材料的可行性。
Er3+ luminescence and cooperative upconversion in ErxY2−xSiO5 nanocrystal aggregates fabricated using Si nanowires is investigated. X-ray diffraction and photoluminescence spectroscopy indicate that the composition of the final nanocrystals can be varied continuously from pure Y2SiO5 to pure Er2SiO5 while keeping the crystal structure the same. Analysis of concentration and pump-power dependence of the Er3+ photoluminescence intensity and decay time shows that while cooperative upconversion occurs at high Er concentrations, the cooperative upconversion coefficient is only (2.2±1.1)×10−18cm3∕s at a Er concentration of 1.2×1021cm−3. This is nearly ten times lower at more than ten times higher Er concentration than that reported from Er-doped silica and demonstrates the viability of using such silicates for compact, high-gain Si-based optical material for Si photonics.