Hyperfine versus spin-vibronic coupling: or do both drive TADF?

Bluebell H. Drummond; Richard H. Friend; Emrys W. Evans; Patrick J. Conaghan; William K. Myers; Seth Marder

doi:10.1117/12.2579572

5 March 2021 Hyperfine versus spin-vibronic coupling: or do both drive TADF?

Bluebell H. Drummond, Richard H. Friend, Emrys W. Evans, Patrick J. Conaghan, William K. Myers, Seth Marder

Proceedings Volume 11683, Organic Photonic Materials and Devices XXIII; 116830I (2021) https://doi.org/10.1117/12.2579572
Event: SPIE OPTO, 2021, Online Only

Abstract

Thermally-activated delayed fluorescence (TADF) organic molecules undergo more efficient light emission than traditional organic fluorescent emitters, making them attractive materials for OLEDs. In TADF OLEDs, indirect emission from dark triplet states via bright singlet excitons is activated and leads to boosted electroluminescence efficiencies. Most studies of TADF use optical spectroscopies that can examine the photophysics and interconversion rates, but do not shed light on the critical spin physics. Here we use transient electron spin resonance spectroscopy to study triplet states involved in TADF and the role of hyperfine and spin-vibronic couplings on the critical singlet-triplet intersystem crossing for efficient TADF.

Conference Presentation

Citation Download Citation

Bluebell H. Drummond, Richard H. Friend, Emrys W. Evans, Patrick J. Conaghan, William K. Myers, and Seth Marder "Hyperfine versus spin-vibronic coupling: or do both drive TADF?", Proc. SPIE 11683, Organic Photonic Materials and Devices XXIII, 116830I (5 March 2021); https://doi.org/10.1117/12.2579572

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