White light emission and optical gains from a Si nanocrystal thin film
White light emission and optical gains from a Si nanocrystal thin film
复制标题
硅纳米晶体薄膜的白光发射和光学增益
DOI：
10.1088/0957-4484/26/47/475203
复制
发表时间：
2015-11-27
期刊：
影响因子：
3.5
通讯作者：
Lu, Ming
中科院分区：
文献类型：
--
作者：
Wang, Dong-Chen;Hao, Hong-Chen;Lu, Ming
我们报道了一种由自支撑的硅纳米晶组成的硅纳米晶薄膜，它可以发射白色光，并在紫外光激发下显示其红，绿色和蓝色（RGB）分量的正光学增益。硅纳米晶体与φ =。2.31+/- 0.35 nm的纳米颗粒通过Si粉末的化学蚀刻制备，然后过滤。在与SiO2溶胶-凝胶混合并热退火后，观察到来自薄膜的宽带光致发光（PL）。通过改变退火温度或气氛可以调节PL的RGB比，对于纯白色光发射，其为1.00/3.26/4.59。PL成分的起源可能是由于硅纳米晶体的氧钝化程度的差异。所得结果可应用于白光硅激光和硅照明。
We report a Si nanocrystal thin film consisting of free-standing Si nanocrystals, which can emit white light and show positive optical gains for its red, green and blue (RGB) components under ultraviolet excitation. Si nanocrystals with phi =. 2.31 +/- 0.35 nm were prepared by chemical etching of Si powder, followed by filtering. After being mixed with SiO2 sol-gel and thermally annealed, a broadband photoluminescence (PL) from the thin film was observed. The RGB ratio of the PL can be tuned by changing the annealing temperature or atmosphere, which is 1.00/3.26/4.59 for the pure white light emission. The origins of the PL components could be due to differences in oxygen-passivation degree for Si nanocrystals. The results may find applications in white-light Si lasing and Si lighting.