Journal article
Photon upconversion by triplet-triplet annihilation in Ru(bpy)3- and DPA-functionalized polymers
PC Boutin, KP Ghiggino, TL Kelly, RP Steer
Journal of Physical Chemistry Letters | Published : 2013
DOI: 10.1021/jz402311j
Abstract
Two photophysically active polymers, each containing one absorbing Ru(bpy)3 triplet sensitizing core and multiple 9,10- diphenylanthracene (DPA) triplet energy acceptors, are shown to exhibit noncoherent photon upconversion by triplet-triplet annihilation (TTA) in both fluid solution and in thin solid films. An analysis of the kinetics and absorbed power dependencies of the upconverted fluorescence demonstrates that, in fluid solution, TTA is occurring in the low-power, pseudo-first order limit, and that the energy transfer mechanism involves fast, efficient intramolecular triplet energy transfer from the excited Ru(bpy)3 core to the DPA acceptors in the macromolecule's pendant arms, followe..
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Grants
Awarded by Australian Research Council
Funding Acknowledgements
The authors gratefully acknowledge the Natural Sciences and Engineering Research Council of Canada for continuing support of this research. K.P.G. thanks the Australian Research Council (Grants DP 0986166 and LE 0989197) for financial support. T.L.K. is a Canada Research Chair in Photovoltaics. This research was undertaken, in part, thanks to funding from the Canada Research Chairs program. We are grateful to Dr. Ming Chen, CSIRO, and Dr. Evan Moore, University of Queensland, for the provision of compounds; Dr. Keith Brown, Department of Chemistry, University of Saskatchewan, for assistance with the DOSY measurements, and Mr. Brook Danger and Ms. Chelsea Greenwald for assistance with the triplet lifetime measurements.