Enhancing the Efficiency of Polariton OLEDs in and Beyond the Single-Excitation Subspace

: Siltanen, Olli; Luoma, Kimmo; Musser, Andrew J.; Daskalakis, Konstantinos S.

Publisher: WILEY-V C H VERLAG GMBH

: WEINHEIM

: 2025

: Advanced Optical Materials

: ADVANCED OPTICAL MATERIALS

: ADV OPT MATER

: 2403046

: 9

: 2195-1071

DOI: https://doi.org/10.1002/adom.202403046

: https://doi.org/10.1002/adom.202403046

: https://research.utu.fi/converis/portal/detail/Publication/485055866

Organic light-emitting diodes (OLEDs) have redefined lighting with their environment-friendliness and flexibility. However, only 25% of the electronic states of organic molecules can emit light upon electrical excitation, limiting the overall efficiency of OLEDs. Strong light-matter coupling, achieved by confining light within OLEDs using mirrors, creates hybrid light-matter states known as polaritons, which could "activate" the remaining 75% electronic triplet states. Here, triplet-to-polariton transition is studied and rates for both reverse inter-system crossing and triplet-triplet annihilation are derived. In addition, how the harmful singlet-singlet annihilation could be reduced with strong coupling is explored.

Advanced Optical Materials - 2025 - Siltanen - Enhancing the Efficiency of Polariton OLEDs in and Beyond the.pdf

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This project received funding from the European Research Council (ERC)under the European Union’s Horizon 2020 research and innovation pro-gramme (grant agreement No. [948260]). The authors would like to thankAhmed Abdelmagid for useful comments.