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Issue 29, 2018
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Photochemical upconversion is suppressed by high concentrations of molecular sensitizers

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Abstract

Photochemical upconversion uses sensitized triplet–triplet annihilation in bimolecular compositions to convert lower energy photons to higher energy photons. For high efficiency under low illumination, usually a high sensitizer concentration is desirable. However, here we show that the upconversion sensitizer can reduce the emitter triplet lifetime by dynamic quenching, with rate constants on the order 106 M−1 s−1, leading to diminishing returns beyond a certain concentration. These results serve as a warning to designers of photochemical upconvertors that higher concentrations of sensitizers are not necessarily beneficial to upconversion performance.

Graphical abstract: Photochemical upconversion is suppressed by high concentrations of molecular sensitizers

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Publication details

The article was received on 26 Apr 2018, accepted on 03 Jul 2018 and first published on 03 Jul 2018


Article type: Paper
DOI: 10.1039/C8CP02650E
Citation: Phys. Chem. Chem. Phys., 2018,20, 19500-19506
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    Photochemical upconversion is suppressed by high concentrations of molecular sensitizers

    E. M. Gholizadeh, L. Frazer, R. W. MacQueen, J. K. Gallaher and T. W. Schmidt, Phys. Chem. Chem. Phys., 2018, 20, 19500
    DOI: 10.1039/C8CP02650E

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