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稀土离子掺杂上转换纳米晶在生物成像和光伏领域具有广泛的应用前景,但其较低的上转换效率限制了其应用。利用原子力显微镜探针在纳米尺度下操控单个金纳米棒与单个上转换纳米晶耦合,通过单颗粒光谱学研究了金纳米棒局域表面等离子体共振对纳米晶上转换发光的影响。结果表明纳米晶上转换发光强度对激发光的偏振方向具有强烈的依赖性。当激发光偏振方向平行于金纳米棒长轴时,纳米晶的绿色和红色上转换发光可以分别获得最大增强倍数为18和40的发光增强。
Rare-earth ion-doped upconverting nanocrystals have wide applications in bioimaging and photovoltaic fields, but their low upconversion efficiency limits their applications. Atomic force microscopy probe was used to manipulate single gold nanorods coupled with a single up-conversion nanocrystal. The effects of localized surface plasmon resonance with gold nanorods on the luminescence of nanocrystals were investigated by single-particle spectroscopy. The results show that the intensity of the nanocrystal up-conversion has a strong dependence on the polarization direction of the excitation light. When the polarization direction of the excitation light is parallel to the long axis of the gold nanorods, the green and red upconversion luminescence of the nanocrystals can obtain the luminescence enhancement with the maximum enhancement magnification of 18 and 40, respectively.