Gilded nanoparticles for plasmonically enhanced fluorescence in TiO2:Sm3+ sol-gel films

Siim Pikker, Leonid Dolgov, Siim Heinsalu, Sergii Mamykin*, Valter Kiisk, Sergei Kopanchuk, Rünno Lõhmus, Ilmo Sildos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Silica-gold core-shell nanoparticles were used for plasmonic enhancement of rare earth fluorescence in sol-gel-derived TiO2:Sm3+ films. Local enhancement of Sm3+ fluorescence in the vicinity of separate gilded nanoparticles was revealed by a combination of dark field microscopy and fluorescence spectroscopy techniques. An intensity enhancement of Sm3+ fluorescence varies from 2.5 to 10 times depending on the used direct (visible) or indirect (ultraviolet) excitations. Analysis of fluorescence lifetimes suggests that the locally stronger fluorescence occurs because of higher plasmon-coupled direct absorption of exciting light by the Sm3+ ions or due to plasmon-assisted non-radiative energy transfer from the excitons of TiO2 host to the rare earth ions.

Original languageEnglish
Article number143
Pages (from-to)1-6
Number of pages6
JournalNanoscale Research Letters
Volume9
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • Metal-enhanced fluorescence
  • Plasmonics
  • Rare-earth fluorescence
  • Silica-gold core-shell nanoparticles

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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