Spontaneous emission modulation of colloidal quantum dots via efficient coupling with hybrid plasmonic photonic crystal.
Spontaneous emission modulation of colloidal quantum dots via efficient coupling with hybrid plasmonic photonic crystal.
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DOI：
10.1364/oe.22.023473
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发表时间：
2014-09
期刊：
影响因子：
3.8
通讯作者：
X. Yuan;Lei Shi;Qi Wang;Changpeng Chen;X. H. Liu;Lan-xiang Sun;Bo Zhang;Jian Zi;W. Lu
中科院分区：
文献类型：
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作者：
X. Yuan;Lei Shi;Qi Wang;Changpeng Chen;X. H. Liu;Lan-xiang Sun;Bo Zhang;Jian Zi;W. Lu
本文报道了用等离子体-光子晶体混合材料修饰的胶体CdSe/ZnS量子点的自发辐射。利用旋涂法实现了这种准二维平板晶体中CQD与表面共振模的空间重叠。在这种情况下，它们的耦合效率大大提高，大多数激发的CQD通过表面模式辐射。因此，尽管我们的混合结构的折射率对比度低，自发辐射的方向性，增加的辐射概率和发射峰的半峰全宽变窄都清楚地观察到我们自制的显微角分辨光谱和时间分辨光致发光系统。结果表明，准二维等离子体-光子晶体是一种理想的材料，可以用来调控CdSe/ZnS CQD的辐射特性，这对发光器件的应用具有重要意义.
The spontaneous emission of colloidal CdSe/ZnS quantum dots (CQDs) modified by the hybrid plasmonic-photonic crystal is reported in this paper. By using a spin coater, the spatial overlap between CQDs and the surface resonance modes in this quasi-2D crystal slab is achieved. In this case, the coupling efficiency of them is enhanced greatly and most excited CQDs radiate through the surface modes. Consequently, despite the low refractive index contrast of our hybrid structure, the directionality of spontaneous emission, increased radiative probability and narrowed full width at half maximum of emission peak are all clearly observed by our home-made microscopic angle-resolved spectroscopy and time-resolved photoluminescence system. Our results manifest that the quasi-2D hybrid plasmonic-photonic crystal is an ideal candidate to tailor the radiative properties of CdSe/ZnS CQDs, which might be significant for the applications of light emitting devices.