Plasmon-enhanced upconversion luminescence in single nanophosphor-nanorod heterodimers formed through template-assisted self-assembly

Nicholas J. Greybush, Marjan Saboktakin, Xingchen Ye, Cristian Della Giovampaola, Soong Ju Oh, Nathaniel E. Berry, Nader Engheta, Christopher B. Murray, Cherie R. Kagan

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84 Citations (Scopus)

Abstract

We demonstrate plasmonic enhancement of upconversion luminescence in individual nanocrystal heterodimers formed by template-assisted self-assembly. Lithographically defined, shape-selective templates were used to deterministically coassemble single Au nanorods in proximity to single hexagonal (β-phase) NaYF4:Yb3+,Er3+ upconversion nanophosphors. By tailoring the dimensions of the rods to spectrally tune their longitudinal surface plasmon resonance to match the 977 nm excitation wavelength of the phosphors and by spatially localizing the phosphors in the intense near-fields surrounding the rod tips, several-fold luminescence enhancements were achieved. The enhancement effects exhibited a strong dependence on the excitation lights polarization relative to the rod axis. In addition, greater enhancement was observed at lower excitation power densities due to the nonlinear behavior of the upconversion process. The template-based coassembly scheme utilized here for plasmonic coupling offers a versatile platform for improving our understanding of optical interactions among individual chemically prepared nanocrystal components.

Original languageEnglish
Pages (from-to)9482-9491
Number of pages10
JournalACS Nano
Volume8
Issue number9
DOIs
Publication statusPublished - 2014 Sep 23
Externally publishedYes

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Keywords

  • gold nanorod
  • plasmon-enhanced luminescence
  • polarization dependence
  • single particle
  • template-assisted self-assembly
  • upconversion nanocrystals

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Greybush, N. J., Saboktakin, M., Ye, X., Della Giovampaola, C., Oh, S. J., Berry, N. E., Engheta, N., Murray, C. B., & Kagan, C. R. (2014). Plasmon-enhanced upconversion luminescence in single nanophosphor-nanorod heterodimers formed through template-assisted self-assembly. ACS Nano, 8(9), 9482-9491. https://doi.org/10.1021/nn503675a