期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 29, 页码 4517-4524出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200800363
关键词
Nanoparticles; Luminescence; Rare earth; Fluorides
资金
- Ramon Areces Foundation
- Spanish Ministerio de Educacion y Ciencia (MEC) [ENE2004-01657, MAT2005-03028, MAT2005-05950]
- Comunidad de Madrid [MICROSERES S-0505/TIC/0191]
- Spanish Ministerio, de Educacion y Ciencia
A very simple route for the synthesis of spherical down-conversion (DC) and up-conversion (UC) NaYF4-based nanophosphors is described which consists of a precipitation reaction at rather low temperature (max. 120 degrees C) from solutions containing sodium fluoride and appropriate Ln precursors in a common solvent (ethylene glycol/water mixtures), without the use of any other additive (complexing agent or surfactant). The role played by the nature of the yttrium precursor and the solvent on the morphological characteristics of the nanoparticles is discussed. The size of the nanospheres, which crystallized in the cubic alpha-NaYF4 phase, could be tuned within the 45-155 nm range by adjusting the reaction parameters (temperature and ethylene glycol/water ratio). The applicability of this method is illustrated for the synthesis of Eu-III-doped (DC), Tb-III-doped (DC) and Yb-III/Er-III codoped (UC) NaYF4 nanophosphors, whose luminescent properties were also analysed. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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