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首页> 外文期刊>Nanotechnology >Ultrathin Y2O3:Eu3+ nanodiscs: spectroscopic investigations and evidence for reduced concentration quenching
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Ultrathin Y2O3:Eu3+ nanodiscs: spectroscopic investigations and evidence for reduced concentration quenching

机译：超薄Y2O3：EU3 + Nanodiscs：光谱研究和减少浓度淬火的证据

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Here, we report the synthesis and spectral properties of ultrathin nanodiscs (NDs) of Y2O3:Eu3+. It was found that the NDs of Y2O3:Eu3+ with a thickness of about 1 nm can be fabricated in a reproducible, facile and self-assembling process, which does not depend on the Eu3+ concentration. The thickness and morphology of these NDs were determined with small angle x-ray scattering and transmission electron microscopy. We found that the crystal field in these nanoparticles deviates from both the cubic and monoclinic characteristics, albeit the shape of the D-5(0)- F-7(J) (J = 0, 1, 2) transitions shows some similarity with the transitions in the monoclinic material. The Raman spectra of the non-annealed NDs manifest various vibration modes of the oleic acid molecules, which are used to stabilise the NDs. The annealed NDs show two very weak Raman lines, which may be assigned to vibrational modes of Y2O3 NDs. The concentration quenching of the Eu3+ luminescence of the NDs before annealing is largely suppressed and might be explained in terms of a reduction of the phonon density of states.
机译：在此，我们报告了Y2O3：Eu3 +的超薄纳米尼蛋白（NDS）的合成和光谱性能。发现厚度为约1nm的Y2O3：Eu3 +的Nds可以在可重复的，容易和自组装过程中制造，其不依赖于Eu3 +浓度。用小角度X射线散射和透射电子显微镜测定这些ND的厚度和形态。我们发现，这些纳米颗粒中的晶体场偏离了立方和单斜晶体特性，尽管D-5（0）的形状 - ＆ F-7（J）（J = 0,1,2）转变与单斜液中的过渡表现出一些相似性。非退火NDS的拉曼光谱表现出油酸分子的各种振动模式，其用于稳定NDS。退火的NDS显示出两个非常弱的拉曼线，可以分配给Y2O3 ND的振动模式。在退火之前，NDS的EU3 +发光的浓度猝灭在很大程度上被抑制，并且可以根据状态的声音密度的降低来解释。

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