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The Influence of Defects on the Luminescence of Trivalent Terbium in Nanocrystalline Yttrium Orthovanadate.

Authors
  • Perrella, Rafael Vieira1
  • Walker, Marc2
  • Chamberlain, Thomas W3
  • Walton, Richard I3
  • de Sousa Filho, Paulo Cesar1
  • 1 Department of Inorganic Chemistry, Institute of Chemistry, University of Campinas (Unicamp), R. Monteiro Lobato, 270, 13083-970, Campinas, São Paulo, Brazil. , (Brazil)
  • 2 Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom. , (United Kingdom)
  • 3 Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom. , (United Kingdom)
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
Apr 19, 2022
Identifiers
DOI: 10.1021/acs.nanolett.1c04937
PMID: 35439016
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Terbium-doped YVO4 has been considered a nonluminescent solid since the first classic studies on rare-earth-doped phosphors in the 1960s. However, we demonstrate that defect engineering of YVO4:Tb3+ nanoparticles overcomes the metal-metal charge transfer (MMCT) process which is responsible for the quenching of the Tb3+ luminescence. Tetragonal (Y1-xTbx)VO4 nanoparticles obtained by colloidal precipitation showed expanded unit cells, high defect densities, and intimately mixed carbonates and hydroxides, which contribute to a shift of the MMCT states to higher energies. Consequently, we demonstrate unambiguously for the first time that Tb3+ luminescence can be excited by VO43- → Tb3+ energy transfer and by direct population of the 5D4 state in YVO4. We also discuss how thermal treatment removes these effects and shifts the quenching MMCT state to lower energies, thus highlighting the major consequences of defect density and microstructure in nanosized phosphors. Therefore, our findings ultimately show nanostructured YVO4:Tb3+ can be reclassified as a UV-excitable luminescent material.

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