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2 August 2021 Low-bias quenching due to spontaneous orientation polarization and its impact on OLED efficiency
Russell J. Holmes
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Proceedings Volume 11808, Organic and Hybrid Light Emitting Materials and Devices XXV; 118080K (2021) https://doi.org/10.1117/12.2595269
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Much effort has been directed at understanding organic light-emitting device (OLED) efficiency and the role of bimolecular quenching in efficiency roll-off. Quenching is less widely discussed at low-bias, where populations are reduced. Here, we describe lock-in-based photoluminescence measurements on working phosphorescent OLEDs to demonstrate that this assumption is not generally valid, and that significant exciton-polaron quenching is present even prior to turn-on. Exciton-polaron quenching arises with holes accumulated due to spontaneous orientation polarization in the electron transport layer. This low-bias quenching is found to strongly determine maximum achievable efficiency, suggesting a need to refine materials selection and device design rules.
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Russell J. Holmes "Low-bias quenching due to spontaneous orientation polarization and its impact on OLED efficiency", Proc. SPIE 11808, Organic and Hybrid Light Emitting Materials and Devices XXV, 118080K (2 August 2021); https://doi.org/10.1117/12.2595269
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KEYWORDS
Organic light emitting diodes
Polarization
Quenching (fluorescence)
Electron transport
Excitons
Luminescence
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