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1 August 2021 Imaging the microscopic variation in spin properties of organic light emitting diodes
William J. Pappas, Rugang Geng, Adrian Mena, Alexander Baldacchino, Amir Asadpoordarvish, Dane R McCamey
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Proceedings Volume 11808, Organic and Hybrid Light Emitting Materials and Devices XXV; 118080I (2021) https://doi.org/10.1117/12.2603441
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Spin is a quantum property fundamental to the charge-light conversion process in optoelectronic devices. Organic materials offer unique opportunities to exploit spin due to their long coherence and lifetimes. The hyperfine interaction, which dominates the spin-dependent recombination processes of these materials, can be chemically tuned on a molecular level while retaining the large-scale fabrication techniques of those materials. To date, this property has been treated monolithically, characterized by a single value across a device. We utilize optical microscopy to spatially resolve the magnetoluminescence effect of an OLED and show the intra-device variation of this spin property reaches nearly 30%. We explore how the variation of this property changes with the operating bias to probe the underlying spin physics and show that these molecular-scale interactions are spatially correlated microscopically over the device.
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William J. Pappas, Rugang Geng, Adrian Mena, Alexander Baldacchino, Amir Asadpoordarvish, and Dane R McCamey "Imaging the microscopic variation in spin properties of organic light emitting diodes", Proc. SPIE 11808, Organic and Hybrid Light Emitting Materials and Devices XXV, 118080I (1 August 2021); https://doi.org/10.1117/12.2603441
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KEYWORDS
Organic light emitting diodes
Magnetism
Molecules
Optical microscopy
Optoelectronic devices
Optoelectronics
Organic electronics
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