Systhesis, phase transformation and photoluminescence properties of Eu:La1xGdxVO4 nanofibers by electrospinning method

One dimensional Eu:La 1 x Gd x VO 4 nanofibers were successfully prepared via an electrospinning method. Thermogravimetry and differential scanning calorimeter (TG-DSC), X-ray diffraction, Raman spectroscopy, scanning electron microscopy and photoluminescence were used to characterize the samples. T...

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Hauptverfasser: Huang, Zuocai, Huang, Siya, Ou, Gang, Pan, Wei
Format: Artikel
Sprache:eng
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Zusammenfassung:One dimensional Eu:La 1 x Gd x VO 4 nanofibers were successfully prepared via an electrospinning method. Thermogravimetry and differential scanning calorimeter (TG-DSC), X-ray diffraction, Raman spectroscopy, scanning electron microscopy and photoluminescence were used to characterize the samples. The nanofibers crystallized well below 600 °C and with the increase of Gd contents, the nanofibers crystallized in a zircon-type structure. The Raman spectra shifted to higher frequency with the increase of Gd content for zircon Eu:La 1 x Gd x VO 4 . The peaks of photoluminescence spectra shift towards longer wavelength when Gd replaces La and when x = 0.4, the photoluminescence intensity reaches its maximum value. The band structure and density of states of m -LaVO 4 , t -LaVO 4 , t -LaGdVO 4 and t -GdVO 4 were calculated by local-spin density approximation (LSDA) band theory with Hubbard term of U . The band gap of t -LaGdVO 4 is just the average of t -LaVO 4 and t -GdVO 4 . In t -LaGdVO 4 , La 5p states are highly localized. m -LaVO 4 doped with GdVO 4 changes into t -LaVO 4 and a maximum photoluminescence intensity is observed for Eu:La 0.6 Gd 0.4 VO 4 nanofibers.
ISSN:2040-3364
2040-3372
DOI:10.1039/c2nr31135f