Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 42, Pages 17478-17481Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja308789u
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Funding
- National Science Foundation [CBET-1033866]
- Korea Institute for Advancement of Technology [2011-GU-400115-001]
- Ministry of Knowledge Economy (MKE), Republic of Korea [2011-GU-400115-001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We herein report the first instance of aqueous-phase photosensitization of semiconductor photocatalysts (WO3 loaded with Pt) through triplet-triplet annihilation (TTA)-based upconversion of sub-band-gap photons. The TTA-based upconversion (UC) was achieved in the aqueous phase by encapsulating the solvent phase containing a benchmark platinum(II) octaethylporphyrin/9,10-diphenylanthracene sensitizer/acceptor pair in a rigid polymer shell in the form of aqueous dispersible microcapsules. A mixture of hexadecane and polyisobutylene,was used as the inner solvent phase. This eliminated the need for the deoxygenation step that is essential for existing TTA-based UC processes and enabled stable UC to occur even after a month of exposure to the ambient environment. The photo-luminescence properties were examined, and UC-assisted photochemical production of hydroxyl radical from green (532 nm) light irradiation was demonstrated for the first time.
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