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Realizing 8 cd A−1 Current Efficiency for Solution-Processed Inverted Top-Emitting Polymer Light-Emitting Diodes

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Abstract

We report indium tin oxide-free top-emitting organic light-emitting diodes (OLEDs) with solution-processed organic layers. The two electrodes are made of evaporated silver, creating a Fabry-Perot resonator. The main issue of solution-processed OLEDs is the thickness reproducibility, which greatly influences the top-emitting OLED’s performance and color because of the optical resonator. In this work, we combine simulation with experimental results to show the good thickness homogeneity of the spin-coated layers, with a 7% thickness accuracy. Similar efficiencies are obtained for top- and bottom-emitting OLEDs based on the same organic materials, 8.1 ± 0.3 cd A−1 and 8.1 ± 0.2 cd A−1, respectively, with similar Commission Internationale de l’Éclairage (CIE) coordinates. This work demonstrates the feasibility to fabricate microcavity top-emitting OLEDs by solution process and the possibility to increase the performance by using a capping layer.

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Acknowledgments

The authors acknowledge support by Interreg (Project Rollflex, 1_11.12.2014).

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Authors and Affiliations

  1. Institute of Electrical Engineering and Information Technology, Kiel University, Kaiserstraße 2, 24143, Kiel, Germany

    Yolande Murat, Hannes Lüder, Markus Köpke, Janek Buhl & Martina Gerken

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  1. Yolande Murat
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Murat, Y., Lüder, H., Köpke, M. et al. Realizing 8 cd A−1 Current Efficiency for Solution-Processed Inverted Top-Emitting Polymer Light-Emitting Diodes. J. Electron. Mater. 50, 2556–2564 (2021). https://doi.org/10.1007/s11664-021-08776-0

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