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Size Effects In The Low Temperature Spectroscopy Of Lu_2o_3 Nanopowders

机译：Lu_2o_3纳米粉低温光谱中的尺寸效应

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摘要

Powder samples of Lu_2O_3 with the following mean size of crystallites: 6 nm, 50 nm and 150 nm were structurally and spectroscopically characterized. XRD patterns and TEM images as well as luminescence, luminescence excitation and reflectance spectra were recorded. The measurements revealed profound differences in luminescent properties of the three specimens and basically all the variations scaled with the size of crystallites. For larger particles complex luminescence spectra with at least four components around 255 nm, 317 nm, 340 nm and 450 nm were observed. For the smallest crystallites only the last two, defect-related constituents could be recorded. Excitation into the host-lattice fundamental absorption, below 210 nm, was progressively less effectively converted into luminescent photons as the crystallites were getting smaller. Excitation and reflectance spectra did not show any signs of quantum confinement down to 6 nm.
机译：具有以下平均晶粒尺寸的Lu_2O_3粉末样品：6 nm，50 nm和150 nm的结构和光谱特征。记录X射线衍射图和TEM图像以及发光，发光激发和反射光谱。测量结果表明，三个样品的发光性能差异很大，基本上所有变化都随微晶尺寸而定。对于较大的颗粒，观察到具有至少四个组分在255nm，317nm，340nm和450nm附近的复合发光光谱。对于最小的微晶，只能记录与缺陷相关的最后两个成分。随着微晶变得越来越小，激发到低于210 nm的主晶格基本吸收的效率逐渐降低，逐渐转化为发光光子。激发和反射光谱在低至6 nm时没有任何量子限制的迹象。

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