Mechanism of photoluminescence enhancement in single semiconductor nanocrystals on metal surfaces
Mechanism of photoluminescence enhancement in single semiconductor nanocrystals on metal surfaces
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DOI：
10.1103/physrevb.75.033309
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发表时间：
2007-01-01
影响因子：
3.7
通讯作者：
Kanemitsu, Yoshihiko
中科院分区：
文献类型：
--
作者：
Ito, Yuichi;Matsuda, Kazunari;Kanemitsu, Yoshihiko
我们利用单纳米晶光谱研究了Au表面单CdSe/ZnS核/壳纳米晶的光致发光（PL）增强和猝灭机制。由于金表面和纳米晶体之间的快速能量转移，在玻璃表面观察到的开关 PL 闪烁在金表面上被大大抑制。与玻璃表面的情况相比，单个 CdSe/ZnS 纳米晶体的 PL 增强发生在粗糙的 Au 表面上，但 PL 淬火发生在平坦的 Au 表面上。单纳米晶光谱表明，粗糙金表面的 PL 增强是由于 PL 闪烁的抑制和局域等离激元激发引起的电场增强引起的。
We have studied the mechanism of the photoluminescence (PL) enhancement and quenching of single CdSe/ZnS core/shell nanocrystals on Au surfaces by means of single nanocrystal spectroscopy. The on-off PL blinking observed on the glass surface is drastically suppressed on Au surfaces, because of the fast energy transfer between Au surfaces and nanocrystals. The PL enhancement of single CdSe/ZnS nanocrystals occurs on rough Au surfaces, but PL quenching occurs on flat Au surfaces, compared to the case of the glass surface. Single nanocrystal spectroscopy reveals that the PL enhancement on rough Au surfaces is caused by the suppression of PL blinking and the electric field enhancement due to localized plasmon excitation.