Preparation and Luminescence Properties of Flexible Eu3+ Doped SiO2 Fibrous Membranes

doi:10.15541/jim20140659

Abstract

Abstract:

Eu³⁺ doped SiO₂ fibrous membranes were prepared by Sol-Gel and electrospinning methods. The obtained samples were chacterized by SEM, XRD, FT-IR, TG, PL, etc. By heat-treatment, the organic components were removed slowly and the diameters of the Eu³⁺ doped SiO₂ fibers decreased. SEM images exhibit that the surface of the fibers retains smooth and uniform after heat-treatment. By controlling the heating rate, the Eu³⁺ doped SiO₂ fibrous membranes present relatively high tensile strength at about 4.31 MPa after heat-treatment at 750℃. The samples exhibit no cracks after bending and recovering process. By excited by 392.6 nm light, the emission peaks between 570-670 nm are observed, which attributes to the ⁵D₀→⁷F_Jtransition. The strongest emission peak situates at 616 nm results from Eu^{3+ 5}D₀→⁷F₂ transition. The optimal heat-treatment temperature is 750℃. PL spectra also show that the luminescence intensity attains the highest value at the concentration of 8mol% Eu³⁺doped.

Key words: electrospinning, flexible, SiO2 fibrous membranes, luminescence properties

CLC Number:

TB34

ZHANG SHU-XIAN, CUI BO, WANG HONG-ZHI, LI YAO-GANG, ZHANG QING-HONG. Preparation and Luminescence Properties of Flexible Eu³⁺Doped SiO₂ Fibrous Membranes[J]. Journal of Inorganic Materials, 2015, 30(7): 719-724.

Figures/Tables 9

Fig. 1 SEM images of fibrous membranes before (a) and after (b) heating treatment

Fig. 2 X-ray diffraction patterns for fibrous membranes after heat-treatment at different temperatures

Fig. 3 FT-IR spectra of the fibrous membranes before (a) and after (b) heat-treatment at 650℃

Fig. 4 TG curves of hybrid fibrous membranes (a) and PVA powder (b)

Fig. 5 Photographs of the blending sample (a) and the sample for testing (b)

Fig. 6 Strength of fibrous membranes change with heat-treatment temperature (a) and 4% tensile recycle curve of fibrous membranes (b)

Fig. 7 Excitation and emission spectra of fibrous membranes (a) λem=616 nm; (b) λex=392.6 nm

Fig. 8 Emission spectra (a) and intensity ratio of 5D0→7F2 transition to 5D0→7F1 transition (b) of fibrous membranes heat-treated at different temperatures

Fig. 9 Emission spectra of fibrous membranes for different concentrations of Eu3+

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Preparation and Luminescence Properties of Flexible Eu³⁺Doped SiO₂ Fibrous Membranes

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