Polarized luminescence properties of Tio₂:Sm³⁺ microfibers and microbelts prepared by electrospinning

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:xSm ³⁺ 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 (λ^ex ) 330 nm) and commercial 365 nm UV lamp excitation, these TiO₂:xSm³⁺ microbelts show intense ⁴G_5/2 → 6H_5/2,7/2,9/2 emissions of Sm³⁺ ions. Polarized luminescence measurement confirms that the luminescence of single TiO₂:xSm³⁺ microbelt is linear polarization.