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Chemical Papers

, Volume 71, Issue 1, pp 149–159 | Cite as

Luminescent Eu-doped GdVO4 nanocrystals as optical markers for anti-counterfeiting purposes

  • Elisa MorettiEmail author
  • Giorgia Pizzol
  • Marina Fantin
  • Francesco Enrichi
  • Paolo Scopece
  • Manuel Ocaña
  • Stefano Polizzi
Original Paper

Abstract

Luminescent Eu:GdVO4 nanoparticles, with an average size of 60 nm, were deposited first on monocrystalline silicon wafers, then on four different natural stone materials, by a spray-coating technique and a silica layer was subsequently deposited by atmospheric pressure plasma jet to protect the luminescent layer and improve its adhesion to the substrate. The luminescent films were characterized by photoluminescence excitation and emission, while the surface morphology was examined by FEG-SEM microscopy and spectroscopic ellipsometry to determine the coating thickness. The optical appearance of the coatings was also evaluated by colorimetric measurements and the efficacy of the fixing action of the silica layer was estimated by PL measurements performed before and after a Scotch™ tape peeling test. The proposed methodology, easily applied on the surface of stone supports, has led to the realization of a luminescent film displaying good mechanical properties, transparent and undetectable in the presence of visible light, but easily activated by UV light source, indicating that the Eu:GdVO4 nanophosphors could be used as luminescent nanotags for a reliable anti-counterfeiting technology.

Keywords

Eu-doped nanophosphors Optical identification markers Spray deposition Atmospheric pressure plasma jet 

Notes

Acknowledgements

Ca' Foscari University of Venice and Consortium INSTM are acknowledged for financial support. Dr. Alessandro Patelli, coordinator of the PANNA European Project (Grant Agreement No 282998) is acknowledged for having inspired the identification marker applicability. Dr. Eleonora Balliana is gratefully acknowledged for providing stone material samples.

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2016

Authors and Affiliations

  • Elisa Moretti
    • 1
    Email author
  • Giorgia Pizzol
    • 1
  • Marina Fantin
    • 2
  • Francesco Enrichi
    • 1
    • 2
    • 3
    • 4
  • Paolo Scopece
    • 2
  • Manuel Ocaña
    • 5
  • Stefano Polizzi
    • 1
    • 6
  1. 1.Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca’ Foscari Venezia, INSTM Venice Research UnitMestre VeniceItaly
  2. 2.Nanofab-Veneto NanotechMarghera (Venice)Italy
  3. 3.Museo Storico della Fisica e Centro Studi e Ricerche Enrico FermiRomeItaly
  4. 4.Division of Materials Science, Department of Engineering Sciences and MathematicsLuleå University of TechnologyLuleåSweden
  5. 5.Instituto de Ciencia de Materiales de Sevilla, CSICSevillaSpain
  6. 6.Centro di Microscopia Elettronica “Giovanni Stevanato”Ca’ Foscari University of VeniceMestre VeniceItaly

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