Lanthanide-doped nanoparticles for hybrid X-ray/optical imaging

L. Sudheendra, Gautom K. Das, C. Li, Simon R Cherry, Ian M. Kennedy

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

2 Scopus citations


Some lanthanide-doped nanoparticles can absorb X-ray radiation and emit in the visible to near infrared spectrum via a down-conversion mechanism, making them a potentially valuable agent for in vivo imaging studies. We have studied a series of Gd3+ and Eu3+compositions in lanthanide fluorides to optimize the emission from Eu3+ upon X-ray excitation. The optimum concentration of Eu3+ that produced the most intense emission in NaGdF4 was found to be 15% molar concentration. The impact of the crystallographic phases (i.e. cubic or hexagonal) on the optical emission was investigated. Furthermore, an attempt to include a sensitizer (i.e Ce3+) in NaGdF4:Eu resulted in a reduction in the emission following X-ray excitation. A surface coating of NaGdF4:Eu nanoparticles with a gold shell showed a similar decrease in luminescence intensity by a factor of two although the gold shell offers other advantages in biomedical applications.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
StatePublished - 2013
EventReporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications V - San Francisco, CA, United States
Duration: Feb 4 2013Feb 6 2013


OtherReporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications V
Country/TerritoryUnited States
CitySan Francisco, CA


  • europium
  • gold
  • imaging
  • nanoparticle
  • phosphor
  • X-ray

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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