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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Enhancing Silicon Nanocrystal Photoluminescence through Temperature and Microstructure
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Enhancing Silicon Nanocrystal Photoluminescence through Temperature and Microstructure

机译:通过温度和微结构增强硅纳米晶体的光致发光

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摘要

Routes to enhancing the photoluminescence (PL) of colloidal silicon nanocrystals (SiNCs) typically focus On changes in surface chemistry and the associated improvements in quantum yield. Here, we report a new more indirect approach that instead exploits the structure of the host matrix. Specifically, we demonstrate that changes in microstructure associated with a thermotropic phase transition in unbound ligand can increase the excitation fluence through scattering, yielding dramatic improvements in PL intensity without any discernible changes in fluorescence lifetime or quantum yield. Using size-purified plasma synthesized SiNCs prepared as solid and liquid samples, we use experiment and computation to examine both intrinsic size-resolved differences in the temperature-dependent PL and an anomalous contribution linked to matrix microstructure. Beyond revealing a potential new route to improved PL intensity, our results further clarity the role of surface states and the challenges that they present.
机译:增强胶态硅纳米晶体(SiNCs)的光致发光(PL)的途径通常集中在表面化学的变化以及量子产率的相关改进上。在这里,我们报告了一种新的更间接的方法,该方法利用了宿主矩阵的结构。具体而言,我们证明了与未结合配体中的热致相变相关的微观结构变化可以通过散射增加激发通量,从而在不改变荧光寿命或量子产率的情况下,显着提高PL强度。使用制备为固体和液体样品的尺寸纯化的血浆合成SiNC,我们使用实验和计算来检验温度依赖性PL的固有尺寸分辨差异以及与基质微观结构相关的异常贡献。除了揭示改善PL强度的潜在新途径外,我们的结果还进一步阐明了表面状态的作用及其所面临的挑战。

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