TitleIntramolecular versus intermolecular triplet fusion in multichromophoric photochemical upconversion
Publication TypeJournal Article
Year of Publication2019
AuthorsGao, C, Prasad, SKK, Zhang, B, Dvořák, M, Tayebjee, MJY, McCamey, DR, Schmidt, TW, Smith, TA, Wong, WWH
JournalJournal of Physical Chemistry C
Date Published07/2019

Photon upconversion is a process that creates high energy photons under low photon-energy excitation. The effect of molecular geometry on the triplet fusion upconversion process has been investigated in this work through the design and synthesis of four new 9,10-diphenylanthracene (DPA) derivatives by employing platinum octaethylporphyrin (PtOEP) as the triplet sensitizer. These new emitter molecules containing multiple DPA subunits linked together via a central benzene core exhibit high fluorescence quantum yields. Interestingly, large differences in the triplet fusion upconversion performance were observed between the derivatives with the meta-substituted dimer showing the closest performance to the DPA reference. The differences are discussed in terms of the statistical probability for obtaining a high energy singlet excited state from triplet fusion, f, for both inter- and intra-molecular processes, and the effect of magnetic field on the upconversion efficiency. These results demonstrate the challenges to be overcome in improving triplet fusion upconversion efficiency based on multichromophoric emitter systems.

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Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Czechia