Abstract
Transparent titanium oxide thin films attract enormous attention from the scientific community because of their prominent properties, such as low-cost, chemical stability, and optical transparency in the visible region. In this study, we developed an easy and scalable solution-based process for the deposition of transparent TiOx thin films on glass substrates. We showed that the proposed method is also suitable for the fabrication of metal-doped TiOx thin films. As proof-of-the-concept, europium Eu(III) ions were introduced into TiOx film. A photoluminescence (PL) study revealed that Eu-doped TiOx thin films showed strong red luminescence associated with 5D0→7Fj relaxation transitions in Eu (III). We found that prepared TiOx thin films significantly reduce the transmittance of destructive UV radiation; a feature that can be useful for the protection of photovoltaic devices. In addition, transparent and luminescent TiOx thin films can be utilized for potential security labeling.
Highlights
Titanium oxides with a general formula TiOx are versatile and low-cost materials suitable for numerous applications
Semitransparent thin films made of TiO2 nanoparticles are used as an electron transporting material in photovoltaic devices [5,6]
Some sophisticated methods, such as chemical vapor deposition [7], spray pyrolysis [8], pulsed laser deposition [9], and RF magnetron sputtering [10] are widely employed for the deposition of titanium oxide thin films
Summary
Titanium oxides with a general formula TiOx (titanium oxide) are versatile and low-cost materials suitable for numerous applications. Some sophisticated methods, such as chemical vapor deposition [7], spray pyrolysis [8], pulsed laser deposition [9], and RF magnetron sputtering [10] are widely employed for the deposition of titanium oxide thin films. These methods either require vacuum conditions and high voltages (pulsed laser deposition, magnetron sputtering) or high temperatures and environmental control (chemical vapor deposition, spray pyrolysis), that are costly and energy-consuming In this regard, spin coating method can be considered as a low-cost and user-friendly method. The rough morphology, semitransparent nature, and cracks formed in these thin films hinder their practical applications It is well-known that the doping process can significantly change the physicochemical properties of titanium oxide. Fabrication simplicity and excellent reproducibility highlight the potential applicability of the proposed method for the generation of functional coatings for security labeling, UV screening, photovoltaic devices, etc
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