关键词: 静电纺丝, 荧光, 氧氮化物

Abstract: Ce³⁺-doped and Sm³⁺ -doped La₃Si₈O₄N₁₁ nanofibers and microbelts were prepared by the electrospinning. The obtained samples were characterized by XRD, FE-SEM, EDS and PL. XRD patterns of sample nitrided at 1400℃ for 9 h were crystallized well and assigned to JCPDF card of the monoclinic La₃Si₈O₄N₁₁ crystal and the sample maintained La3Si8O4N11 phase after doping Ce³⁺ or Sm³⁺ ions. The obtained sample not only keeps the morphology of nanofiber but also assembles as film. Under ultraviolet excitation (343 nm), the emission spectra of Ce³⁺-doped La₃Si₈O₄N₁₁ sample consists a board peak near 430 nm and a shoulder at 460 nm, it results from Ce³⁺ 5d-4f transition. The dacay curve of Ce³⁺-doped La₃Si₈O₄N₁₁ nanofibers exhibits double-exponential decay curve. The fast and slow decay lifetimes of Ce³⁺-doped La₃Si₈O₄N₁₁ nanofibers are about 8.27 and 32.72 ns. The emission spectra of Sm³⁺ -doped La₃Si₈O₄N₁₁ shows four sharp peaks situated at 575, 600, 610 and 650?nm when excited at 409 nm results from Sm³⁺ 4f-4f transition.

Key words: electrospinning, luminescence, oxynitride