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Issue 26, 2017
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Understanding the remarkable luminescence enhancement via SiO2 coating on TiO2:Eu3+ nanofibers

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Abstract

TiO2:Eu3+ nanofibers diameters can be tuned by changing the mixed solvent ratio are synthesized via the electrospinning technique. Concentration quenching phenomena and the relationship of the PL intensity ratio I(5D07F2)/I(5D07F1) with the Eu doping concentration are discussed. Notably, the luminescence intensity is enhanced by about 7.8 fold by coating SiO2 gel layer on the TiO2:Eu3+ nanofibers, which is successfully performed via a sol–gel process followed by calcination. Furthermore, these fibers are characterized systematically via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence (PL) spectroscopy. Additionally, their Judd–Ofelt and spectral parameters are calculated to investigate their local structures. The relatively low Ω2 value of the coated samples reveals a decrease in covalency in the Eu–O bonds and an increase in the symmetric nature of Eu3+, which indicate that the perturbation effect of the crystal field in the solid system is larger than that of the uncoated samples. FT-IR analysis indicates the formation of Ti–O–Si bonds, which provide the ligand field in the interface between the TiO2:Eu3+ nanofibers and SiO2 layer and can repair the surface unsaturated bonds. This reduces the selection rules for radiative transitions, thereby the state of the Eu3+ ions is converted from dormant to activated. Moreover, the silica coating stabilizes the surface of the TiO2:Eu3+ nanofibers and eliminates the surface defects. Finally, a detailed mechanism is proposed to explain the luminescence enhancement behavior.

Graphical abstract: Understanding the remarkable luminescence enhancement via SiO2 coating on TiO2:Eu3+ nanofibers

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Publication details

The article was received on 20 Feb 2017, accepted on 06 Jun 2017 and first published on 07 Jun 2017


Article type: Paper
DOI: 10.1039/C7CP01113J
Citation: Phys. Chem. Chem. Phys., 2017,19, 17063-17074
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    Understanding the remarkable luminescence enhancement via SiO2 coating on TiO2:Eu3+ nanofibers

    M. Chang, Y. Song, Y. Sheng, J. Chen and H. Zou, Phys. Chem. Chem. Phys., 2017, 19, 17063
    DOI: 10.1039/C7CP01113J

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