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Article

Oxygen Plasma Treatment of Rear Multilayered Graphene: A Potential Top Electrode for Transparent Organic Light-Emitting Diodes

Reality Devices Research Division, Electronics and Telecommunications Research Institute, Daejeon 34129, Korea
Materials 2021, 14(21), 6652; https://doi.org/10.3390/ma14216652
Received: 25 September 2021 / Revised: 19 October 2021 / Accepted: 3 November 2021 / Published: 4 November 2021
One of the core technologies of transparent organic light-emitting diodes (TOLEDs) is to develop an optically transparent and high electrical conductivity electrode so that light generated inside the device can efficiently escape into the air through the electrodes. We recently reported in TOLED research that two flipping processes are required to dry-transfer the front multilayered graphene (MLG) to the top electrode, while the rear MLG requires one dry transfer process. As the transfer process increases, the electrical properties of graphene deteriorate due to physical damage and contamination by impurities. At the charge-injecting layer/MLG interface constituting the TOLED, the rear MLG electrode has significantly lower charge injection characteristics than the front MLG electrode, so it is very important to improve the electrical characteristics of the rear MLG. In this paper, we report that the light-emitting properties of the TOLED are improved when an oxygen plasma-treated rear MLG is used as the top electrode, as compared with untreated rear MLG. In addition, the fabricated device exhibits a transmittance of 74–75% at the maximum electroluminescence wavelength, and the uniformity of transmittance and reflectance is more constant at a wavelength of 400–700 nm than in a device with a metal electrode. Finally, near-edge X-ray absorption fine structure spectroscopic analysis proves that the MLG crystallinity is improved with the removal of impurities on the surface after oxygen plasma treatment. View Full-Text
Keywords: organic light-emitting diode; multilayered graphene; photoemission spectroscopy; near edge X-ray absorption fine structure spectroscopy organic light-emitting diode; multilayered graphene; photoemission spectroscopy; near edge X-ray absorption fine structure spectroscopy
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MDPI and ACS Style

Lim, J.T. Oxygen Plasma Treatment of Rear Multilayered Graphene: A Potential Top Electrode for Transparent Organic Light-Emitting Diodes. Materials 2021, 14, 6652. https://doi.org/10.3390/ma14216652

AMA Style

Lim JT. Oxygen Plasma Treatment of Rear Multilayered Graphene: A Potential Top Electrode for Transparent Organic Light-Emitting Diodes. Materials. 2021; 14(21):6652. https://doi.org/10.3390/ma14216652

Chicago/Turabian Style

Lim, Jong T. 2021. "Oxygen Plasma Treatment of Rear Multilayered Graphene: A Potential Top Electrode for Transparent Organic Light-Emitting Diodes" Materials 14, no. 21: 6652. https://doi.org/10.3390/ma14216652

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