Large-area transparent conductive few-layer graphene electrode in GaN-based ultra-violet light-emitting diodes

Byung Jae Kim, Chongmin Lee, Younghun Jung, Kwang Hyeon Baik, Michael A. Mastro, Jennifer K. Hite, Charles R. Eddy, Jihyun Kim

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102 Citations (Scopus)


We report on the development of a large-area few-layer graphene (FLG)-based transparent conductive electrode as a current spreading layer for GaN-based ultraviolet (UV) light-emitting diodes (LEDs). Large-area FLG was deposited on Cu using the chemical vapor deposition (CVD) method and subsequently transferred to the surface of the UV LED. UV light at a peak of 372 nm was emitted through the FLG-based transparent conductive electrode. The current spreading effects of FLG were clearly evident in both the optical images of electroluminescence (EL) and current-voltage (I-V) characteristics. Degradation of the FLG-based transparent conductive electrode could be induced by high power operation. Our results indicate that a large-area FLG-based electrode on GaN offers excellent current spreading and ultra-violet transparency properties when compared to the standard optoelectronic indium tin oxide (ITO) contact layer.

Original languageEnglish
Article number143101
JournalApplied Physics Letters
Issue number14
Publication statusPublished - 2011 Oct 3

Bibliographical note

Funding Information:
The research at Korea University was supported by New & Renewable Energy R&D program (R0903962) under the Ministry of Knowledge Economy, Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Minstry of Education, Science and Technology (2009-0088551 and 2010-0008242) and LG Innotek-Korea University Nano-Photonics Program. Research at the US Naval Research Lab is supported by the Office of Naval Research.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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