Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.190
Publication date: 11th July 2022
Many metal oxide semiconductors, such as TiO2, require UV excitation in order to drive photocatalytic reactions. However, UV photons account for only 3-5% of the solar spectrum, and thus strategies to extend the range of harvested photons into the visible wavelength range are required. One potential way is to use triplet-triplet annihilation photon up-conversion (TTA-UC). TTA-UC systems generate higher energy photons from lower energy, low intensity, and non-coherent excitation. In this work, we synthesized several 9,10-diphenylanthracene derivatives and attached them to different wide-bandgap metal oxide nanoparticles, TiO2, ZrO2, and CeO2, which were then dispersed in solutions containing triplet sensitizers. Triplet energy transfer leading to triplet-triplet annihilation photon up-conversion and charge generation were probed through steady-state and transient spectroscopy techniques such as photo-induced absorption (PIA), time-resolved photoluminescence (trPL), and transient absorption (TA) spectroscopy. We characterized these TTA-UC systems as films and suspensions and applied them in different photocatalytic processes as proof of concept.
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