Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 46, Pages 23226-23232Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp209774p
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Funding
- foundation Futura
- Swedish Research Council (VR)
- Knut and Alice Wallenberg Foundation
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Photon upconversion based on sensitized triplet triplet annihilation has been observed on nanocrystalline ZrO2 films cosensitized with platinum(II) octaethylporphyrin (triplet sensitizer) and 9,10-diphenylanthracene (singlet emitter) under sunlight-like conditions (noncoherent excitation source, excitation light intensity as low as 5 mW/cm(2)). Time-resolved emission measurements showed a fast rise of the upconverted signal (<= 10 ns), suggesting that triplet energy migration most probably occurs through a static Dexter mechanism. To the best of our knowledge, this is the first observation of photon upconversion based on sensitized triplet triplet annihilation on a sensitized mesoporous metal oxide. Implementation of similar systems in dye-sensitized solar cells would increase the maximum theoretical efficiency of these devices from 30% to over 40%.
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