文摘
One-dimensional TiO2:xSm3+ 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:xSm3+ microfibers and microbelts. SEM and HRTEM results indicate that TiO2:xSm3+ microfibers calcined at different temperature are belt-like. The average width and thickness of TiO2:xSm3+ microbelts calcined at 700 °C is about 1.0 and 0.4 μm, respectively. Under ultraviolet excitation (λex = 330 nm) and commercial 365 nm UV lamp excitation, these TiO2:xSm3+ microbelts show intense 4G5/2 → 6H5/2,7/2,9/2 emissions of Sm3+ ions. Polarized luminescence measurement confirms that the luminescence of single TiO2:xSm3+ microbelt is linear polarization.
