Preparation And Luminescence Properties Of BaTiO₃: Eu³⁺ Nanofibers

Nanostructure of one-dimensional semiconductor has a wide application prospect in the fields of optics, optoelectronic devices and dielectric. Nano-crystalline of one-dimensional semiconductor has obvious advantages in limitation domain, homogeneous geometry and crystallinity controlled, so it becomes one of the most active fields in the research on semiconductor. One-dimensional nano–semiconductor with different kinds and different morphologies were synthesized, nano-crystalline of one-dimensional semiconductor made great progress on devices.BaTiO₃ ceramic has been widely applied for superior photoelectric properties, cubic BaTiO₃ phase is typical perovskite structure. The structure makes different sizes donor ions doped into crystal lattice, then BaTiO₃ shows semiconductor properties. Materials of perovskite structure with rare-earth doped can be used in integrated light emitting devices, field emission devices and positive temperature coefficient resistor. Research on one-dimensional nano-barium titanate has been increasing in optoelectronics research field. BaTiO₃ nanofibers doped with Eu³⁺ were prepared from poly vinyl pyrrolidone (PVP)/ Ti(OiPr)4/ Eu³⁺/Ba2+ composite which were formed as a result of combining the sol–gel process with electrospinning technique. These nanofibers could be subsequently converted into BaTiO₃:Eu³⁺ without changing their morphology via calcination in air. The structures and luminescence properties of the composites were characterized by powder X-ray diffraction (XRD), Laser Raman spectra (Raman) and photoluminescence spectra. Research shows that: 1.According to the measured results in the condition of the same calcining temperature and the different doping concentrations of BaTiO₃:Eu³⁺, the results show that when the calcining temperature is higher than 800°C the main phase of this sample is cubic and it also contains hexagonal phase. The crystallization quality of crystal is improved obviously with increasing of the temperature, and the grain size is increased gradually. Phase transformation from cubic to tetragonal was observed when the temperature is higher than 1100°C, and the luminescence intensity increase with the increasing of the temperature.2.According to the measured results in the condition of the same doping concentration and the different calcining temperatures of BaTiO₃:Eu³⁺, the results show that the crystallization quality of powders is also improved obviously doped with Eu³⁺.With the increasing of the concentration of Eu³⁺ the grain size is decreases continuously. The luminescence intensity is decreased with the increasing of the concentration of Eu³⁺. The concentration quench is observed when the concentration is 5:100.