Solar power is becoming increasingly important as a renewable energy source. The high-energy UV light with a wavelength shorter than 400 nm found in sunlight can be utilized in a variety of ways, such as photopolymerization and activating photocatalysts to produce green hydrogen or useful hydrocarbo
The ability of UV light to efficiently kill viruses and bacteria through photocatalytic reactions is another important application. However, only a small portion of sunlight falls within the UV range, leaving much of the spectrum unused for this purpose.
Previous works in this field have reported visible-to-UV UC using organic solvent solutions that required the solution to be deoxygenated first and then sealed in an airtight container to prevent exposure to oxygen that deactivated and degraded TTA-basedUC samples. These materials not only lacked photostability in the presence of oxygen but also failed to perform effectively with sunlight-intensity incident light. These issues presented roadblocks in the practical applications of photon UC.
To prepare this material, the researchers melted together a sensitizer with a much larger quantity of an annihilator ; the combination of the sensitizer and annihilator was selected by the researchers. This bi-component melt was then cooled over a temperature gradient-controlled surface to form a solid-state visible-to-UV photon UC thin film.
Finally, to demonstrate the visible-to-UV photon UC of the thin film, the researchers used it with a 1-Sun-intensity simulated sunlight consisting only of visible light to successfully cure and solidify a resin that would otherwise require UV light for the same process.
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