Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.281
Publication date: 18th July 2019
Exciton-polaritons are quasiparticles with mixed photon and exciton character that demonstrate rich quantum phenomena, novel optoelectronic devices and the potential to modify chemical properties of materials. Organic semiconductors are of current interest for their room-temperature polariton formation. However, within organic optoelectronic devices, it is often the ‘dark’ spin-1 triplet excitons that dominate operation. These triplets have been largely ignored in treatments of polariton physics. I will talk about results that demonstrate polariton population from the triplet manifold via triplet-triplet annihilation, leading to polariton emission that is longer-lived (>μs) even than exciton emission in bare films. This enhancement arises from high-spin triplet-pair states, formed by singlet fission or triplet-triplet annihilation (up-conversion), feeding the polariton. We propose this side-stepping of spin selection rules is possible due to state mixing, which – in the strong coupling regime – enables sharing of photonic character with states that are formally non-emissive. Our observations offer the enticing possibility of harvesting or manipulating states that are formally dark.
The following people are co-authors on the work to be presented.
Andrew Musser1, Daniel Polak1, Rahul Jayaprakash1, Shuangqing Wang1, Thomas P Lyons1, Anastasia Leventis2, Kealan J Fallon2, Harriet Coulthard1, David G Bossanyi1, Kyriacos Georgiou1, Anthony J Petty3, John Anthony3, Hugo Bronstein2, Alexander I Tartakovskii1, Jenny Clark1
1 Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, UK
2 Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
3 Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA
This work was supported by the Engineering and Physical Sciences Research Council, U.K. (Grant Number EP/M025330/1, ‘Hybrid Polaritonics’), the University of Sheffield and EU project 679789-455 ‘CONTREX'. AJM gratefully acknowledges LR Weiss for useful discussion about exchange coupling.
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