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首页> 外文期刊>Nanotechnology >Nickel-assisted growth and selective doping of spinel-like gallium oxide nanocrystals in germano-silicate glasses for infrared broadband light emission
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Nickel-assisted growth and selective doping of spinel-like gallium oxide nanocrystals in germano-silicate glasses for infrared broadband light emission

机译：锗硅酸盐玻璃中尖晶石状氧化镓纳米晶体的镍辅助生长和选择性掺杂，用于红外宽带发光

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The target of taking advantage of the near-infrared light-emission properties of nickel ions in crystals for the design of novel broadband optical amplifiers requires the identification of suitable nanostructured glasses able to embed Ni-doped nanocrystals and to preserve the workability of a glass. Here we show that Ni doping of Li _2O-Na _2O-Ga _2O _3-GeO _2-SiO _2 glass (with composition 7.5:2.5:20:35:35 and melting temperature 1480°C, sensibly lower than in Ge-free silicates) enables the selective embedding of nickel ions in thermally grown nanocrystals of spinel-like gallium oxide. The analysis of transmission electron microscopy and x-ray diffraction data as a function of Ni-content (from 0.01 to 1mol%) indicates that Ni ions promote the nanophase crystallization without affecting nanoparticle size (～6nm) and concentration (～4×10 ~(18)cm ~(-3)). Importantly, as shown by optical absorption spectra, all nickel ions enter into the nanophase, with a number of ions per nanocrystal that depends on the nanocrystal concentration and ranges from 1 to 10 ~2. Photoluminescence data indicate that fast non-radiative decay processes become relevant only at mean ion-ion distances shorter than 1.4nm, which enables the incorporation of a few Ni ions per nanoparticle without too large a worsening of the light-emission efficiency. Indeed, at 0.1mol% nickel, the room temperature quantum yield is 9%, with an effective bandwidth of 320nm.
机译：利用晶体中镍离子的近红外发光特性来设计新型宽带光放大器的目标要求确定能够嵌入镍掺杂的纳米晶体并保持玻璃的可加工性的合适的纳米结构玻璃。在这里，我们显示Li _2O-Na _2O-Ga _2O _3-GeO _2-SiO _2玻璃（成分为7.5：2.5：20：35：35和熔化温度1480°C的Ni掺杂）明显低于不含Ge的硅酸盐）可将镍离子选择性嵌入到尖晶石状氧化镓的热生长纳米晶体中。透射电子显微镜和X射线衍射数据随Ni含量（0.01至1mol％）的变化分析表明，Ni离子可促进纳米相结晶，而不会影响纳米颗粒尺寸（〜6nm）和浓度（〜4×10〜 （18）厘米〜（-3））。重要的是，如光学吸收光谱所示，所有镍离子都进入纳米相，每个纳米晶的离子数量取决于纳米晶的浓度，范围为1到10〜2。光致发光数据表明，快速的非辐射衰变过程仅在小于1.4nm的平均离子离子距离处才有意义，这使得每个纳米粒子可以掺入几个Ni离子而不会太大地降低发光效率。实际上，在镍含量为0.1mol％的情况下，室温量子产率为9％，有效带宽为320nm。

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