Tailoring the Emission Behavior of WO 3 Thin Films by Eu 3+ Ions for Light-Emitting Applications.

Autor: Kavitha, V. S., Biju, V., Gopchandran, K. G., Praveena, R., Jayasankar, C. K., Mekprasart, Wanichaya, Boonyarattanakalin, Kanokthip, Pecharapa, Wisanu, Pillai, V. P. Mahadevan
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Zdroj: Nanomaterials (2079-4991); Jan2023, Vol. 13 Issue 1, p7, 20p
Abstrakt: The article reports the successful fabrication of Eu3+-doped WO3 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 WO3:Eu3+ thin film system using RFMS. X-ray diffractograms revealed that the crystalline nature of these thin films increased upto 3 wt% of the Eu3+ concentration. The diffraction peaks in the crystalline films are matched well with the monoclinic crystalline phase of WO3, but for all the films', micro-Raman spectra detected bands related to WO3 monoclinic phase. Vibrational and surface studies reveal the amorphous/semi-crystalline behavior of the 10 wt% Eu3+-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 Eu3+-doping content. The doped films, except the one at a higher doping concentration (10 wt%), show unique emissions of Eu3+ ions, besides the band edge emission of WO3. With an enhancement of the Eu3+ content, the concentration quenching process of the Eu3+ 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 Eu3+ ion concentration. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index