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Structural and spectroscopic properties of Yb³âº-doped MgAl2O4 nanocrystalline spinel.
Wiglusz, Rafal J; Boulon, Georges; Guyot, Yannick; Guzik, Malgorzata; Hreniak, Dariusz; Strek, Wieslaw.
  • Wiglusz RJ; Institute of Low Temperature and Structure Research, PAS, ul. Okolna 2, PL-50-422 Wroclaw, Poland.
Dalton Trans ; 43(21): 7752-9, 2014 Jun 07.
Artigo em Inglês | MEDLINE | ID: mdl-24699861
Magnesium spinel (MgAl2O4) powders doped with Yb(3+) ions have been synthesized by a sol-gel method and heat-treated in the range of 700-1000 °C for 3 h. XRD patterns indicated that the powders have a cubic structure with high crystallite dispersion. Nanoparticles in the range of 10-30 nm are obtained as a function of the dopant concentration and sintering temperature. The main Yb(3+) zero-phonon line is located at 976 nm. The spectroscopic properties of the Yb(3+) ions are characterized by broad absorption spectroscopy and emission spectroscopy. Even at low temperature, the spectra reveal a strong distorted spinel lattice due to the high inversion rate between Mg(2+) tetrahedral sites and Al(3+) octahedral sites. The substitution of Mg(2+) ions by Yb(3+) ions favors the creation of Yb(3+) ion pairs which are observed in the cooperative luminescence spectra at around 500 nm. The luminescence decays are influenced by both the Yb(3+) content, the energy transfer between ions and by the presence of pairs and aggregates. Detailed analysis of the observed structural and spectroscopic measurements has been described in this manuscript.





Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Dalton Trans Assunto da revista: Química Ano de publicação: 2014 Tipo de documento: Artigo País de afiliação: Polônia