Photon Upconversion on Dye-Sensitized Nanostructured ZrO2 Films
2011 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 46, 23226-23232 p.Article in journal (Refereed) Published
Photon upconversion based on sensitized triplet triplet annihilation has been observed on nanocrystalline ZrO(2) 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%.
Place, publisher, year, edition, pages
2011. Vol. 115, no 46, 23226-23232 p.
IdentifiersURN: urn:nbn:se:uu:diva-163657DOI: 10.1021/jp209774pISI: 000297001000069OAI: oai:DiVA.org:uu-163657DiVA: diva2:464990