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20 August 2020 Use of metagratings to enhance performance of organic thin-film light emitting devices
Xin Xu, Hoyeong Kwon, Andrea Alù, Ananth Dodabalapur
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Proceedings Volume 11473, Organic and Hybrid Light Emitting Materials and Devices XXIV; 114730C (2020) https://doi.org/10.1117/12.2569318
Event: SPIE Organic Photonics + Electronics, 2020, Online Only
Abstract
The external quantum efficiency of organic light emitting devices is affected by losses within the devices. We show that the seamless incorporation of 2-dimensional reflecting metagratings within the structure of organic light emitting devices can result in substantial changes and improvements in light emission characteristics. Quasiperiodic as well as periodic metagratings have been included. With periodic square lattice metagratings, enhancements in surface-normal emission intensity (of up to 4.8x) have been observed relative to a control device without a metagrating. The enhanced intensities in the normal direction is due to increased out-coupling of ordinarily waveguided light that is typically lost within the device. Electromagnetic simulations and measurements show that our metagratings greatly enhance the electromagnetic field intensity in the light emission layer, leading to increased emission normal to the plane of the layers.
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Xin Xu, Hoyeong Kwon, Andrea Alù, and Ananth Dodabalapur "Use of metagratings to enhance performance of organic thin-film light emitting devices", Proc. SPIE 11473, Organic and Hybrid Light Emitting Materials and Devices XXIV, 114730C (20 August 2020); https://doi.org/10.1117/12.2569318
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KEYWORDS
Thin film devices
Thin films
Control systems
Displays
Electromagnetic simulation
Electromagnetism
Polarization
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