How should we reduce efficiency roll-off in TADF OLEDs? A figure of merit approach

Stefan Diesing; Le Zhang; Thomas Sayner; Arvydas Ruseckas; Eli Zysman-Colman; Ifor D. W. Samuel

doi:10.1117/12.3028839

30 September 2024 How should we reduce efficiency roll-off in TADF OLEDs? A figure of merit approach

Stefan Diesing, Le Zhang, Thomas Sayner, Arvydas Ruseckas, Eli Zysman-Colman, Ifor D. W. Samuel

Proceedings Volume 13122, Organic and Hybrid Light Emitting Materials and Devices XXVIII; 131220P (2024) https://doi.org/10.1117/12.3028839
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States

Abstract

The efficiency of all LEDs decreases as their light output increases, and this effect is known as efficiency roll-off. It is a significant effect in phosphorescent OLEDs, and can be severe in TADF OLEDs, leading to efficiencies at useful brightnesses far below reported maximum efficiencies. The literature suggests that the main approaches to improving the situation are to reduce the energy difference between singlet and triplet, and to increase the rate of reverse intersystem crossing. We show this is incomplete and by considering the dynamic equilibrium between singlet and triplet, propose a figure of merit to guide the development of improved materials. The possibility of extending the approach to hyperfluorescence will also be considered.

Conference Presentation

Citation Download Citation

Stefan Diesing, Le Zhang, Thomas Sayner, Arvydas Ruseckas, Eli Zysman-Colman, and Ifor D. W. Samuel "How should we reduce efficiency roll-off in TADF OLEDs? A figure of merit approach", Proc. SPIE 13122, Organic and Hybrid Light Emitting Materials and Devices XXVIII, 131220P (30 September 2024); https://doi.org/10.1117/12.3028839

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