Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching bei München, Germany.
J Fluoresc. 2011 Mar;21(2):539-43. doi: 10.1007/s10895-010-0740-z. Epub 2010 Oct 9.
We present the fabrication and optical investigation of highly random self-assembled, nano-scale films, probing their influence on the luminescence properties of near surface CdSe/ZnS colloidal quantum dots. When compared to quantum dots distributed on unstructured quartz substrates, the average luminescence intensity is found to be enhanced by a factor of 160×. The silver nanoparticles are prepared using slow thermal evaporation on quartz substrates and post-deposition annealing to produce a randomly-arranged layer of smooth nano-islands. Clear polarization dependent hot spots are observed. Such hot spots deliver a maximal enhancement of the emission intensity of 240× and have a spatial density of (0.050±0.002) μm( -2). The results show that silver nano-island films strongly enhance the optical efficiency of near quantum dots emitters.
我们展示了高度随机自组装的纳米薄膜的制造和光学研究，探究了它们对近表面 CdSe/ZnS 胶体量子点发光性能的影响。与分布在非结构化石英衬底上的量子点相比，发现平均发光强度增强了 160 倍。银纳米粒子是通过在石英衬底上缓慢热蒸发和沉积后退火来制备的，以产生随机排列的光滑纳米岛层。观察到明显的偏振相关热点。这些热点使发射强度最大增强 240 倍，空间密度为(0.050±0.002) μm( -2)。结果表明，银纳米岛膜强烈增强了近量子点发射器的光学效率。
