Heterogeneous nanostructures for plasmonic interaction with luminescence and quantitative surface-enhanced Raman spectroscopy

Gautom K. Das, L. Sudheendra, Ian M. Kennedy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

NIR-To-visible up-conversion nanomaterials have been investigated in many promising applications including nextgeneration displays, solar cells, and biological labels. When doped with different trivalent lanthanide ions, NaYF4 nanoparticles can produce up-converted emission from visible to infra-red wavelengths. However, the quantum yield of this class of materials is low. Noble metals in the vicinity of the phosphor can increase the phosphorescence by local field enhancement due to plasmonic resonances, and by modification of the radiative rate of the phosphor. Most previous studies have investigated the phenomenon by placing nanophosphors onto a metal substrate, or by fabrication of nano structures with spacers such as polymers, dielectric materials (silica). By contrast, we have studied the interaction between the luminescence and the surface plasmon using a core-shell type nanostructure where a uniform shell of silver is shown to grown on doped-NaYF4 nanophosphors by Ostwald ripening. We further demonstrate the proximity effect of metal-enhanced luminescence by exciting an undoped NaYF4 shell. The result shows a significant synergistic enhancement of up-conversion luminescence due to the active shell as spacer layer. In addition, we have shown this novel nanostructure may be useful in surface-enhanced Raman spectroscopy (SERS).

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
PublisherSPIE
Volume8956
ISBN (Print)9780819498694
DOIs
StatePublished - 2014
EventReporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications VI - San Francisco, CA, United States
Duration: Feb 2 2014Feb 5 2014

Other

OtherReporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications VI
CountryUnited States
CitySan Francisco, CA
Period2/2/142/5/14

Keywords

  • Hetero-epitaxial growth
  • Raman spectroscopy
  • SERS
  • surface Plasmon
  • up-conversion enhancement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Das, G. K., Sudheendra, L., & Kennedy, I. M. (2014). Heterogeneous nanostructures for plasmonic interaction with luminescence and quantitative surface-enhanced Raman spectroscopy. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 8956). [89560X] SPIE. https://doi.org/10.1117/12.2037889