Annihilation Versus Excimer Formation by the Triplet Pair in Triplet-Triplet Annihilation Photon Upconversion
Journal article, 2019

© 2019 American Chemical Society. The triplet pair is the key functional unit in triplet-triplet annihilation photon upconversion. The same molecular properties that stabilize the triplet pair also allow dimers to form on the singlet energy surface, creating an unwanted energy relaxation pathway. Here we show that excimer formation most likely is a consequence of a triplet dimer formed before the annihilation event. Polarity-dependent studies were performed to elucidate how to promote wanted emission pathways over excimer formation. Furthermore, we show that the yield of triplet-triplet annihilation is increased in higher-viscosity solvents. The results will bring new insights in how to increase the upconversion efficiency and how to avoid energy-loss channels.


Chen Ye

University of Gothenburg

Victor Gray

Uppsala University

University of Cambridge

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Jerker Mårtensson

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Karl Börjesson

University of Gothenburg

Journal of the American Chemical Society

0002-7863 (ISSN) 1520-5126 (eISSN)

Vol. 141 24 9578-9584

Subject Categories

Physical Chemistry

Other Chemistry Topics

Theoretical Chemistry





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7/2/2019 2