Fabrication and Luminescence Properties of La2O2S:Tb3+ Hollow Nanofibers

Abstract

La2O2S:Tb3+ hollow nanofibers were successfully fabricated by sulfurization of the relevant La2O3:Tb3+ hollow nanofibers via double-crucible method. The morphology and properties of the products were investigated in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrometry. La2O2S:Tb3+ hollow nanofibers were pure hexagonal phase with space group P\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\bar {3}$$\\end{document}m1 and were hollow-centered structure with the mean diameter of 160.03 ± 17.74 nm. Emission spectra indicate that La2O2S:Tb3+ hollow nanofibers emit green light at 544 nm attributed to 5D4 → 7F5 energy levels transition of Tb3+ ions. CIE analysis demonstrated that the light emitted by La2O2S:Tb3+ hollow nanofibers corresponds to the green region, and color-tuned luminescence can be obtained by changing concentration of Tb3+ ions. The obtained material could be applied in the field of optical telecommunication and optoelectronic devices. The possible formation mechanism of La2O2S:Tb3+ hollow nanofibers was also proposed.