Polarized Luminescence Properties of TiO2:Sm~(3+) Microfibers and Microbelts Prepared by Electrospinning

摘要

One-dimensional TiO2:xSm~(3+) microfibers and microbelts were prepared by electrospinning. X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectrometer (EDS), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL), electron paramagnetic resonance (EPR), and polarized luminescence measurements were performed to characterize these TiO2:xSm~(3+) microfibers and microbelts. SEM and HRTEM results indicate that TiO2:xSm~(3+) microfibers calcined at different temperature are belt-like. The average width and thickness of TiO2:xSm~(3+) microbelts calcined at 700 °C is about 1.0 and 0.4 μm, respectively. Under ultraviolet excitation (λ_(ex) = 330 nm) and commercial 365 nm UV lamp excitation, these TiO2:xSm~(3+) microbelts show intense ~4G_(5/2) ->~6H_(5/2,7/2,9/2) emissions of Sm~(3+) ions. Polarized luminescence measurement confirms that the luminescence of single TiO2:xSm~(3+) microbelt is linear polarization.