Synthesis and Properties of Hollow CaSi2O2N2:Eu2+ Luminescence Fibers

doi:10.15541/jim20130639

Abstract

Abstract:

Hollow Eu²⁺ doped CaSi₂O₂N₂ and Ca-Si-O-Eu nanofibers were prepared through electrospinning combined with gas-reduction-nitridation method. The Ca-Si-O-Eu precursor was smooth and uniform, has a length arrange from ten to hundred micrometers. The as-obtained sample not only keeps the hollow structure but also assembles to a film. XRD patterns reveal that the sample nitrided under 1300℃ for 5 h are crystallized well and maintained CaSi₂O₂N₂ phase after Eu²⁺ doping. The emission spectra of Eu²⁺ doped CaSi₂O₂N₂ under the 400 nm ultraviolet light irradiation has a board peak centered at 550 nm, which results from Eu²⁺ 5d-4f transition. In comparison with CaSi₂O₂N₂:Eu phosphor powders and fiber film, the hollow CaSi₂O₂N₂:Eu phosphor fiber film has stronger emission intensity under PL measurement.

Key words: hollow fiber, electrospinning, luminescence fiber, oxynitride

CLC Number:

TB34

CUI Bo, WANG Hong-Zhi, LI Yao-Gang, ZHANG Qing-Hong. Synthesis and Properties of Hollow CaSi₂O₂N₂:Eu²⁺ Luminescence Fibers[J]. Journal of Inorganic Materials, 2014, 29(10): 1029-1033.

Figures/Tables 7

Fig. 1 XRD patterns of the samples treated at different temperatures and different atmospheres

Fig. 2 XRD patterns of luminescence fibers nitride at different temperatures

Fig. 3 FE-SEM images for nanofiber Precursor (a), hollow nanofiber at low magnification (b) and high magnification (c)

Fig. 4 Illustrative scheme for the formation mechanism of hollow nanofiber

Fig. 5 FE-SEM image of samples nitrided at 1300℃ (a), cross section image at low maganification (b) and high magnification (c)

Fig. 6 Excitation spectrum (a) and emission spectrum (b) of hollow CaSi2O2N2:Eu nanofibers Inset is the photo of the nanofibers under the 365 nm ultraviolet light

Fig. 7 Photoluminescence spectra of the CaSi2O2N2: Eu powders and fibers

References 18

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Synthesis and Properties of Hollow CaSi₂O₂N₂:Eu²⁺ Luminescence Fibers

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