Abstract
Transparent BaTiO3:Eu3+ films were prepared via a sol-gel method and dip-coating technique, using barium acetate, titanium butoxide, and polyvinylpyrrolidone (PVP) as modifier viscosity. BaTiO3:Eu3+ films ~500 nm thick, crystallized after thermal treatment at 700 ºC. The powders revealed spherical and rod shape morphology. The optical quality of films showed a predominant band at 615 nm under 250 nm excitation. A preliminary luminescent test provided the properties of the Eu3+ doped BaTiO3.
Highlights
IntroductionLanthanide-doped ultrafine and nanocrystalline oxide materials have been widely investigated due to their optical properties, which make them promising candidates for applications in optoelectronic devices and flat panel displays [1,2,3]
In recent years, lanthanide-doped ultrafine and nanocrystalline oxide materials have been widely investigated due to their optical properties, which make them promising candidates for applications in optoelectronic devices and flat panel displays [1,2,3]
The present study describes a modified sol-gel process for preparing europium doped BaTiO3 films using monosubstituting agents like acetic acid [29] and acetylacetone [11] to change the precursors formed in the conventional sol-gel process [30], and using polyvinylpyrrolidone (PVP), which has proved to have significant advantages in the elaboration of uniform non-doped BaTiO3 thick films
Summary
Lanthanide-doped ultrafine and nanocrystalline oxide materials have been widely investigated due to their optical properties, which make them promising candidates for applications in optoelectronic devices and flat panel displays [1,2,3]. BaTiO3 thin films have previously been prepared by different methods such as MOCVD [16], sputtering [17], electrophoretic deposition [18] and sol-gel [19,20,21] Among these methods, the sol-gel route has been intensively studied because, in general, this process is flexible enough to produce ceramic powders, fibers, and monoliths, as well as advantageously elaborate films of complex oxides [22,23,24,25]. The sol-gel route has been intensively studied because, in general, this process is flexible enough to produce ceramic powders, fibers, and monoliths, as well as advantageously elaborate films of complex oxides [22,23,24,25] This method implies the formation of a colloidal (‘sol’) solution which is traditionally based on dissolved organometallic molecular precursors. The hydrolysis problem has been investigated by the addition of glacial acetic acid and acetylacetone to Ti(OR)4 [27,28]
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