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

Julie S. Biteen; Domenico Pacifici; Nathan S Lewis; Harry A. Atwater

doi:10.1021/nl051207z

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

Julie S. Biteen, Domenico Pacifici, Nathan S Lewis, Harry A. Atwater

California Institute of Technology

Research output: Contribution to journal › Article

206 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1768-1773
Number of pages	6
Journal	Nano Letters
Volume	5
Issue number	9
DOIs	https://doi.org/10.1021/nl051207z
Publication status	Published - Sep 2005

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ASJC Scopus subject areas

Materials Science(all)
Electronic, Optical and Magnetic Materials
Chemistry (miscellaneous)

Cite this

Biteen, J. S., Pacifici, D., Lewis, N. S., & Atwater, H. A. (2005). Enhanced radiative emission rate and quantum efficiency in coupled silicon nanocrystal-nanostructured gold emitters. Nano Letters, 5(9), 1768-1773. https://doi.org/10.1021/nl051207z

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AB - 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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10.1021/nl051207z