The influence of polyvinylpyrrolidone on thick and optical properties of BaTiO3:Er3+ thin films prepared by sol–gel method

Erbium (Er 3+ ) 0.5% mol doped barium titanate (BaTiO 3 ) thin films were elaborated via sol–gel method and dip-coating technique using titanium alkoxide and barium pentanedionate. Two syntheses were performed [with and without polyvinylpyrrolidone (PVP)] in order to obtain thick films. The BaTiO 3...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2010-02, Vol.53 (2), p.246-254
Main Authors: García Hernández, M., Carrillo Romo, F. de J., García Murillo, A., Jaramillo Vigueras, D., Meneses Nava, M. A., Bartolo Pérez, P., Chadeyron, G.
Format: Article
Language:English
Subjects:
Barium titanates
Ceramics
Chemistry
Chemistry and Materials Science
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Composites
Dip coatings
Erbium
Exact sciences and technology
General and physical chemistry
Glass
Immersion coating
Inorganic Chemistry
Mapping
Materials Science
Nanotechnology
Natural Materials
Optical and Electronic Materials
Optical properties
Organic chemistry
Original Paper
Photomicrographs
Polyvinylpyrrolidone
Silicon dioxide
Sol-gel processes
Substrates
Thick films
Thickness
Thin films
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:Erbium (Er 3+ ) 0.5% mol doped barium titanate (BaTiO 3 ) thin films were elaborated via sol–gel method and dip-coating technique using titanium alkoxide and barium pentanedionate. Two syntheses were performed [with and without polyvinylpyrrolidone (PVP)] in order to obtain thick films. The BaTiO 3 :Er 3+ thin films prepared from the sol with PVP were elaborated with 1 layer and those without PVP and were elaborated with 17 layers. In both cases, the films were deposited on silica quartz substrates. Both BaTiO 3 :Er 3+ films presented a cubic phase, as determined by X-ray diffraction. BaTiO 3 :Er 3+ films elaborated with PVP via single-step dip coating produced crack-free films with thicknesses of ~800 nm. SEM micrographs for the obtained BaTiO 3 :Er 3+ films revealed high homogeneity and density. Mapping images obtained from BaTiO 3 :Er 3+ revealed homogeneous distribution of Er 3+ ions on the surface. XPS analyses of the chemical state and chemical environment of the constituent elements in the compositions showed that Er 3+ ions in (Ba 1− x Er x )TiO 3 are in mixed valence of Er 3+ /Er 2+ . The BaTiO 3 :Er 3+ -PVP film exhibited luminescent properties under near-infrared excitation, as revealed by green emissions. The BaTiO 3 :Er 3+ -PVP film has good potential for optical applications.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-009-2084-1