Luminescence quantum yields of gold nanoparticles varying with excitation wavelengths

Yuqing Cheng, Guowei Lu*, Yingbo He, Hongming Shen, Jingyi Zhao, Keyu Xia, Qihuang Gong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Luminescence quantum yields (QYs) of gold nanoparticles including nanorods, nanobipyramids and nanospheres are measured elaborately at a single nanoparticle level with different excitation wavelengths. It is found that the QYs of the nanostructures are essentially dependent on the excitation wavelength. The QY is higher when the excitation wavelength is blue-detuned and close to the nanoparticles' surface plasmon resonance peak. A phenomenological model based on the plasmonic resonator concept is proposed to understand the experimental findings. The excitation wavelength dependent QY is attributed to the wavelength dependent coupling efficiency between the free electron oscillation and the intrinsic plasmon resonant radiative mode. These studies should contribute to the understanding of one-photon luminescence from metallic nanostructures and plasmonic surface enhanced spectroscopy.

Original languageEnglish
Pages (from-to)2188-2194
Number of pages7
JournalNanoscale
Volume8
Issue number4
DOIs
Publication statusPublished - 28 Jan 2016

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