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Opt Express. 2010 Oct 25;18(22):23030-4. doi: 10.1364/OE.18.023030.

Transparent conductive graphene electrode in GaN-based ultra-violet light emitting diodes.

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  • 1Department of Chemical & Biological Engineering, Korea University, Seoul 136-713, Korea.


We report a graphene-based transparent conductive electrode for use in ultraviolet (UV) GaN light emitting diodes (LEDs). A few-layer graphene (FLG) layer was mechanically deposited. UV light at a peak wavelength of 368 nm was successfully emitted by the FLG layer as transparent contact to p-GaN. The emission of UV light through the thin graphene layer was brighter than through the thick graphene layer. The thickness of the graphene layer was characterized by micro-Raman spectroscopy. Our results indicate that this novel graphene-based transparent conductive electrode holds great promise for use in UV optoelectronics for which conventional ITO is less transparent than graphene.

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