Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.122
Publication date: 7th February 2022
Singlet exciton fission (SF), and its reverse, triplet–triplet annihilation (TTA), represent two promising ways of manipulating photons in optoelectronic devices via energetic down- or up-conversion, respectively. They are also fascinating physical processes, the study of which offer insights into the fundamental physics of organic semiconductors and photoactive proteins.
In this talk, I will focus on some recent work from my group on understanding the fundamentals of SF and TTA [1] in organic molecular thin films [2,3], photoactive proteins [4] and microcavities [5]. Our recent work shows that SF and TTA both proceed via a real, emissive triplet-pair state in endo- and exothermic singlet fission materials. We find that in microcavities in the strong coupling regime, delayed emission from triplet-triplet annihilation is enhanced compared with bare films and that the spin-statistics governing up-conversion yield can be modified through molecular an intermolecular design [6].
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