High-energy acceptor states strongly enhance exciton transfer between metal organic phosphorescent dyes

Xander de Vries; Reinder Coehoorn; Peter A. Bobbert

doi:10.1117/12.2644998

11 January 2023 High-energy acceptor states strongly enhance exciton transfer between metal organic phosphorescent dyes

Xander de Vries, Reinder Coehoorn, Peter A. Bobbert

Proceedings Volume 12336, Frontiers in Luminescent Organic Semiconductor Materials and Devices; 1233605 (2023) https://doi.org/10.1117/12.2644998
Event: SPIE Photonex, 2022, Birmingham, United Kingdom

Abstract

Exothermic Förster-type exciton transfer to lower-energy emitters plays a crucial role in OLEDs. As is well-known, a small exothermicity partially overcomes the spectral Stokes shift, enhancing the Förster transfer rate. We demonstrate here another enhancement mechanism: transfer to higher-lying electronically excited states of the acceptor molecules. We evaluate the Förster transfer rate for 84 different donor–acceptor pairs of phosphorescent emitters. Due to the enhancement the Förster radius tends to increase with increasing exothermicity, from around 1 nm to almost 4 nm. The enhancement becomes particularly strong when the excited states have a large spin-singlet character.

Conference Presentation

Citation Download Citation

Xander de Vries, Reinder Coehoorn, and Peter A. Bobbert "High-energy acceptor states strongly enhance exciton transfer between metal organic phosphorescent dyes", Proc. SPIE 12336, Frontiers in Luminescent Organic Semiconductor Materials and Devices, 1233605 (11 January 2023); https://doi.org/10.1117/12.2644998

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