Glycerol-bonded 3C-SiC nanocrystal solid films exhibiting broad and stable violet to blue-green emission.
Glycerol-bonded 3C-SiC nanocrystal solid films exhibiting broad and stable violet to blue-green emission.
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DOI：
10.1021/nl100407d
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发表时间：
2010-03
期刊：
影响因子：
10.8
通讯作者：
Junzhuan Wang;S. Xiong;Xinglong Wu;T. H. Li;P. Chu
中科院分区：
文献类型：
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作者：
Junzhuan Wang;S. Xiong;Xinglong Wu;T. H. Li;P. Chu
我们已经制备了甘油键合的3C-SiC纳米晶（NC）膜，当被不同波长的光子激发时，由于3C-SiC纳米晶所呈现的量子限制效应，其产生强的且可调谐的紫到蓝绿色（360-540 nm）发射。发射是如此强烈，以至于发射点是肉眼可见的。发光非常稳定，即使在空气中储存超过六个月后，也没有观察到强度下降。X射线光电子能谱和吸收精细结构的测量表明，硅封端的NC表面是完全键合到甘油分子。基于密度泛函理论的几何优化和电子结构的计算表明，这些分子被键合在纳米碳上，引起强烈的表面结构变化，而裸3C-SiC纳米碳的导带中的孤立能级被准连续带取代，通过改变激发激光的频率，提供发射光的连续可调谐性。作为一个应用，我们展示了使用3C-SiC NC制造全色发射固体薄膜的潜力，通过将多孔硅。
We have produced glycerol-bonded 3C-SiC nanocrystal (NC) films, which when excited by photons of different wavelengths, produce strong and tunable violet to blue-green (360-540 nm) emission as a result of the quantum confinement effects rendered by the 3C-SiC NCs. The emission is so intense that the emission spots are visible to the naked eyes. The light emission is very stable and even after storing in air for more than six months, no intensity degradation can be observed. X-ray photoelectron spectroscopy and absorption fine structure measurements indicate that the Si-terminated NC surfaces are completely bonded to glycerol molecules. Calculations of geometry optimization and electron structures based on the density functional theory for 3C-SiC NCs with attached glycerol molecules show that these molecules are bonded on the NCs causing strong surface structural change, while the isolated levels in the conduction band of the bare 3C-SiC NCs are replaced with quasi-continuous bands that provide continuous tunability of the emitted light by changing the frequencies of exciting laser. As an application, we demonstrate the potential of using 3C-SiC NCs to fabricate full-color emitting solid films by incorporating porous silicon.