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Author: search.filters.author.Biju, V.Has files: No

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    Item type:Publication,
    Tailoring the Emission Behavior of WO3 Thin Films by Eu3+ Ions for Light-Emitting Applications
    (2023-01-01)
    Kavitha, V. S.
    ;
    Biju, V.
    ;
    Gopchandran, K. G.
    ;
    Praveena, R.
    ;
    Jayasankar, C. K.
    The article reports the successful fabrication of Eu<sup>3+</sup>-doped WO<inf>3</inf> thin films via the radio-frequency magnetron sputtering (RFMS) technique. To our knowledge, this is the first study showing the tunable visible emission (blue to bluish red) from a WO<inf>3</inf>:Eu<sup>3+</sup> thin film system using RFMS. X-ray diffractograms revealed that the crystalline nature of these thin films increased upto 3 wt% of the Eu<sup>3+</sup> concentration. The diffraction peaks in the crystalline films are matched well with the monoclinic crystalline phase of WO<inf>3</inf>, but for all the films’, micro-Raman spectra detected bands related to WO<inf>3</inf> monoclinic phase. Vibrational and surface studies reveal the amorphous/semi-crystalline behavior of the 10 wt% Eu<sup>3+</sup>-doped sample. Valence state determination shows the trivalent state of Eu ions in doped films. In the 400–900 nm regions, the fabricated thin films show an average optical transparency of ~51–85%. Moreover, the band gap energy gradually reduces from 2.95 to 2.49 eV, with an enhancement of the Eu<sup>3+</sup>-doping content. The doped films, except the one at a higher doping concentration (10 wt%), show unique emissions of Eu<sup>3+</sup> ions, besides the band edge emission of WO<inf>3</inf>. With an enhancement of the Eu<sup>3+</sup> content, the concentration quenching process of the Eu<sup>3+</sup> ions’ emission intensities is visible. The variation in CIE chromaticity coordinates suggest that the overall emission color can be altered from blue to bluish red by changing the Eu<sup>3+</sup> ion concentration.
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