Issue 29, 2018

Photochemical upconversion is suppressed by high concentrations of molecular sensitizers

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

Supplementary files

Article information

Article type
Paper
Submitted
26 Apr 2018
Accepted
03 Jul 2018
First published
03 Jul 2018

Phys. Chem. Chem. Phys., 2018,20, 19500-19506

Author version available

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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