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      https://www.ias.ac.in/article/fulltext/boms/043/0002

    • Keywords

       

      Up-conversion; NaYF$_4$:Yb,Er; solvothermal; PAA; PVP; chitosan.

    • Abstract

       

      Up-converting NaYF$_4$:Yb,Er nanoparticles were obtained by polymer-assisted solvothermal synthesis using a common solution of hydrated RE nitrates in ethanol or ethylene glycol. It was shown that polymer choice (polyacrylic acid—PAA, polyvinylpyrrolidone—PVP and chitosan—CS) controls the size and shape of NaYF$_4$:Yb,Er nanoparticles, while the solvent type and pH value affect their crystallinity. Consequently, the spherical nanoparticles of a cubic ($\alpha$) phase, the average size of which ranged from 60 to 140 nm, were obtained either when PVP/ethanol or PVP/ethylene glycol were used solely during synthesis, whereas NaOH addition induced hexagonal ($\beta$) phase nucleation. The formation of the hierarchically organized spherical aggregates and nanofoils was observed when CS and PAA were used during synthesis, respectively. The average crystallite size, microstrain, doping level, lattice parameters, as well as, the presence of the certain ligands on the particle surface were determined and correlated with the intensity of visible-light emission observed under 980 nm laser-diode excitation.

    • Author Affiliations

       

      M VUKOVIC1 I DINIC1 M G NIKOLIC2 B A MARINKOVIC3 A M L M COSTA3 K RADULOVIC4 O MILOSEVIC5 L MANCIC5

      1. Innovation Center of the Faculty of Chemistry, University of Belgrade, Belgrade 11000, Serbia
      2. Photonic Center, Institute of Physics Belgrade, University of Belgrade, Zemun, Belgrade 11080, Serbia
      3. Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, Brazil
      4. Centre of Microelectronic Technologies, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Belgrade 11000, Serbia
      5. Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade 11000, Serbia
    • Dates

       
  • Bulletin of Materials Science | News

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