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Quantum-sized silicon for enhanced photoluminescence and optical nonlinearity
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2021-09-08 , DOI: 10.1039/d1qm01061a
Zhexue Chen 1, 2 , Weibiao Wang 1, 2 , Xinyu Sui 2, 3 , Kangkang Wang 1, 2 , Jianqi Zhang 1 , Xinfeng Liu 2, 3 , Yong Zhang 1, 2
Affiliation  

Full-scale size control of intrinsic nanomaterials is highly desired but far from satisfactory. Herein, we report a robust strategy capable of mechanically tailoring bulk silicon (Si) into Si nanoparticles (SiNPs). The as-produced SiNPs are single crystalline with intrinsic characteristics. The combination of silica-assisted ball-milling and sonication-assisted solvent treatment, as well as cascade centrifugation, enables narrow-band size control over wide ranges (133–11 nm). The production process is highly reproducible with an overall yield up to 78 wt%. Strong size effects are observed in the spectroscopy, photoluminescence (PL), and nonlinear saturation absorption (NSA) of the SiNPs. Notably, the Si quantum dots (SiQDs) with an average size of 11 nm demonstrate significantly enhanced PL and NSA performances. An absolute modulation depth of 35.9% and saturation intensity of 1.53 MW cm−2 (153 nJ cm−2) are derived for the SiQDs. Such a high nonlinear response and low excitation power would prompt the practical application of quantum-sized Si in mode-locked lasers and related fields.

中文翻译:

用于增强光致发光和光学非线性的量子尺寸硅

本征纳米材料的全尺寸控制是非常需要的,但远不能令人满意。在此,我们报告了一种强大的策略,能够将体硅 (Si) 机械裁剪成硅纳米粒子 (SiNPs)。所生产的 SiNP 是具有固有特性的单晶。二氧化硅辅助球磨和超声辅助溶剂处理以及级联离心相结合,可在宽范围 (133-11 nm) 内实现窄带尺寸控制。生产过程具有高度可重复性,总产率高达 78 wt%。在 SiNPs 的光谱、光致发光 (PL) 和非线性饱和吸收 (NSA) 中观察到强烈的尺寸效应。值得注意的是,平均尺寸为 11 nm 的 Si 量子点 (SiQD) 表现出显着增强的 PL 和 NSA 性能。绝对调制深度为 35。-2 (153 nJ cm -2 ) 是为 SiQD 导出的。如此高的非线性响应和低激发功率将促进量子尺寸硅在锁模激光器及相关领域的实际应用。
更新日期:2021-09-24
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