Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 29, 2018
Previous Article Next Article

Photochemical upconversion is suppressed by high concentrations of molecular sensitizers

Author affiliations

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

Back to tab navigation

Supplementary files

Article information


Submitted
26 Apr 2018
Accepted
03 Jul 2018
First published
03 Jul 2018

Phys. Chem. Chem. Phys., 2018,20, 19500-19506
Article type
Paper
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

Social activity

Search articles by author

Spotlight

Advertisements