Comparison of structural and spectroscopic properties of Ho3+-doped niobate compounds
NALIN, Marcelo
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
< Leer menos
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
Idioma
en
Article de revue
Este ítem está publicado en
Materials Research Bulletin. 2021, vol. 143, p. 111451
Elsevier
Resumen en inglés
Ho3+-doped YNbO4 and Y3NbO7 phosphors were synthesised via a co-precipitation synthesis route. Structural characterisation and spectroscopic properties were performed as a function of the Ho3+ concentration. The Rietveld ...Leer más >
Ho3+-doped YNbO4 and Y3NbO7 phosphors were synthesised via a co-precipitation synthesis route. Structural characterisation and spectroscopic properties were performed as a function of the Ho3+ concentration. The Rietveld type-refinement confirms the stabilisation of the pure monoclinic Fergusonite YNbO4 phase at the highest temperatures, but the quadratic phase is stabilised for the lowest temperature, whereas a pure cubic fluorite Y3NbO7 phase was observed for all of the heat treatments. Raman and infrared spectroscopies were used to compare the cation-oxygen vibrational modes. Emission spectra and up-conversion processes were obtained under excitation at 445 and 975 nm respectively. For a similar Ho3+ content, the energy transfers observed show differences between the two crystalline compounds that are related to a stronger interaction between the holmium cations in the fluorite host lattice.< Leer menos
Palabras clave en inglés
energy transfer
rare earth
niobate
luminescence
Raman
Proyecto ANR
Céramiques luminescentes de forte efficacité LASER dans la fenêtre 1.7-2.7 microns - ANR-20-CE08-0016
Orígen
Importado de Hal