Influence of the embedding matrix on optical properties of Ge nanocrystals-based nanocomposite
Influence of the embedding matrix on optical properties of Ge nanocrystals-based nanocomposite
复制标题
嵌入基质对Ge纳米晶基纳米复合材料光学性能的影响
DOI：
10.1063/1.4789959
复制
发表时间：
2013
影响因子：
3.2
通讯作者：
A. Slaoui
中科院分区：
文献类型：
--
作者：
S. Parola;E. Quesnel;V. Muffato;J. Bartringer;A. Slaoui
采用纳米团簇源制备了锗纳米晶，并通过光致发光和分光光度法对其进行了表征。进行了光学测量，以估计的有效带隙的Ge纳米晶体。Mie理论和量子限制理论都被用来解释提取的吸收数据。我们发现，量子限制理论能够解释的尺寸和主机矩阵依赖的带隙的双光子晶体。另一方面，光致发光测量不允许确认从吸收数据评估的带隙。这被解释为由于在纳米晶体表面的复合的主导作用。
Germanium nanocrystals were prepared by a nanocluster source and characterized by photoluminescence and spectroscopic photometry methods. The optical measurements were carried out in order to estimate the effective bandgap of the Ge nanocrystals. Both Mie theory and the quantum confinement theory were applied to interpret the extracted absorption data. We found that the quantum confinement theory enables to explain the nanocrystal size and the host matrix dependence of the nanocrystal bandgap. On the other hand, the photoluminescence measurements have not allowed to confirm the bandgap evaluated from absorption data. This is explained as due to the dominant effect of the recombination at the nanocrystals surface.