Comparison of structural and spectroscopic properties of Ho3+-doped niobate compounds
Nenhuma Miniatura disponível
Data
2021-11-01
Autores
Guene-Girard, S.
Courtois, J.
Dussauze, M.
Heintz, J-M.
Fargues, A.
Roger, J.
Nalin, M. [UNESP]
Cardinal, T.
Jubera, V.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
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.
Descrição
Palavras-chave
Energy transfer, Luminescence, Niobate, Raman, Rare earth
Como citar
Materials Research Bulletin, v. 143.