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

Abstract

TiO2:Eu3+ nanofibers with tunable diameter via changing the mixed solvent ratios have been synthesized by electrospinning technique. Concentration quenching phenomena and relationship of PL intensity ratio I(5D0-7F2)/ I(5D0-7F1) with the Eu doping concentration have been discussed. It is worth mentioning that luminescence intensity is enhanced by about 7.8 fold through coating SiO2 gel layer on TiO2 :Eu3+ nanofibers which were successfully prepared through sol-gel process followed by calcination. Furthermore, these fibers were characterized systematically using 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, etc. The Judd–Ofelt and spectral parameters were calculated to investigating local structure. The relative low 2 value of coated samples reveals the decrease in covalency of the Eu-O bonds and the increase in the symmetric nature of Eu3+, which means that the perturbation effect of the crystal field in solid system becomes larger compared with that of uncoated samples. The FT-IR analysis indicate the forming of Ti-O-Si bond, which provide the ligand field in the interface between TiO2:Eu3+ nanofibers and SiO2 layer, and the bond can repair surface unsaturated bonds, which reduce selection rules of radiative transitions, thereby the state of Eu3+ ions converted from “dormant” to “activated”, moreover, silica coating would stabilize the surface of TiO2:Eu3+ nanofibers and eliminate the defects on the surface of the nanofibers. A detailed analysis was proposed to explain the luminescence enhancement behavior.

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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, Accepted Manuscript
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    Understanding the remarkable luminescence enhancement via SiO2 coating on TiO2 :Eu3+ nanofibers

    M. Chang, H. zou, Y. Sheng, Y. Song and J. Chen, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP01113J

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