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Graphene-encapsulation effect of BaTiO3 on AC electroluminescence

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Abstract

Alternating current (AC) driven inorganic electroluminescence (EL) was investigated with a focus on the polymer-based dielectric layer, where barium titanate (BTO) powder particles encapsulated in reduced graphene oxide (rGO) platelets. The EL devices with rGO-encapsulated BTO exhibited higher luminescence and lower current density than the non-encapsulated case with BTO only, primarily due to enhanced dielectric performance of the dielectric layer. This was originated from the encapsulation of BTO in rGO platelets through the interfacial polarization of numerous micro-capacitors within the dielectric layer. By varying the concentration of rGO (0, 0.05, 0.10, and 0.20 wt%), the optimum concentration of encapsulated rGO was found to be near 0.10 wt%, where the highest concentration case (0.20 wt%) showed the worst EL performance, possibly due to crisscross linking among rGO-encapsulated BTO. We found that the quality of the dielectric layer, if the optimum concentration of graphene was employed, was a key factor in AC EL.

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Acknowledgements

This research was financially supported by Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Education of Korea government (NRF-2018R1D1A1B07050688). S.Y. was financially supported by Hankuk University of Foreign Studies Research Fund of 2020.

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Authors and Affiliations

  1. Department of Physics, Sungkyunkwan University, Suwon, 16419, South Korea

    So-Yeon Jun

  2. Joining R&D Group, Korea Institute of Industrial Technology, Incheon, 21999, South Korea

    So-Yeon Jun

  3. Department of Physics, Hankuk University of Foreign Studies, Yongin, 17035, South Korea

    SeGi Yu

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  1. So-Yeon Jun
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  2. SeGi Yu
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Correspondence to SeGi Yu.

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Jun, SY., Yu, S. Graphene-encapsulation effect of BaTiO3 on AC electroluminescence. J. Korean Phys. Soc. 78, 1128–1132 (2021). https://doi.org/10.1007/s40042-021-00167-2

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  • DOI: https://doi.org/10.1007/s40042-021-00167-2

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