Enhanced radiative emission rate and quantum efficiency in coupled silicon nanocrystal-nanostructured gold emitters

被引：215

作者：

Biteen, JS ^{[1
]}

Pacifici, D ^{[1
]}

Lewis, NS ^{[1
]}

Atwater, HA ^{[1
]}

机构：

[1] CALTECH, Pasadena, CA 91125 USA

来源：

NANO LETTERS | 2005年 / 5卷 / 09期

关键词：

D O I：

10.1021/nl051207z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report local-field-enhanced light emission from silicon nanocrystals close to a film of nanoporous gold. We resolve photoluminescence as the gold-Si nanocrystal separation distance is varied between 0 and 20 nm and observe a fourfold luminescence intensity enhancement concomitant with increases in the coupled silicon nanocrystal/nanoporous gold absorbance cross section and radiative decay rate. A detailed analysis of the luminescence data indicated a local-field-enhanced quantum efficiency of 58% for the Si nanocrystals coupled to the nanoporous gold layer.

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页码：1768 / 1773

页数：6

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