Abstract
A study on the optical properties and photoluminescence (PL) spectra of doped Magnesium oxide thin films revealed that the change in dopant concentration could direct the roadmap to improve the characteristics of the films. In FTIR analysis, Mg-O vibrational modes were exposed for all samples. V-doping also caused changes in the intensity, shape and position of the peaks in the FTIR pattern. In XRD analysis, the crystallite size was about half the crystallite size in the MgO film with the addition of V-doping, and the amount of strain also increased. FESEM images showed that the surface of MgO thin film had hollows and surface discontinuities with spherical grains. With adding V dopant, the grain size decreases and their number increases. The water contact angle measurements showed that surface hydrophobicity decreased with increasing surface non-uniformity. In the UV-NIR transmittance spectra, the absorption edge shifted slightly to larger wavelengths (red-shift) by adding V dopant. The optical band gap of magnesium oxide thin film with vanadium doping decreased from 3.72 eV to 3.60 eV. PL spectra for MgO thin film showed a prominent peak in the UV region due to the recombination emission of electrons and holes. The apparition of sub-band can be attributed to vacancies for MgO, known as Fs, Fs+ and Fs2+ (color centers).
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The author acknowledges the University of Zanjan Research Council and the University of Emam Ali for support of this work.
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“All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by [Farhad Chharganeh kalangestani] and [Mohammadreza Nourmohammadian]. The first draft of the manuscript was written by [Farhad Chharganeh kalangestani] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.”
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Nourmohammadian, M., Kalangestani, F.C. Wettability behavior, photoluminescence and optical properties studies of nanostructured vanadium-doped magnesium oxide thin films: an effect of V concentrations. Opt Quant Electron 55, 20 (2023). https://doi.org/10.1007/s11082-022-04148-y
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DOI: https://doi.org/10.1007/s11082-022-04148-y