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Nov 23rd, 2012
Enhanced light output power of GaN light-emitting diodes with graphene film as a transparent conducting electrode
Researchers in Korea have developed gold-doped graphene as a transparent and current-spreading electrode (TCSE) for ultraviolet (UV) light-emitting diodes (LEDs).
Researchers from the Chonbuk National University and Sungkyungkyun University reported the enhanced light output power of GaN-based light-emitting diode (LED) by using graphene film as a transparent conducting electrode. Monolayer graphene was synthesized on copper foil by using chemical vapor deposition method and directly transferred onto the GaN-LED as a top electrode. Compared to the conventional LEDs using indium tin oxide (ITO) layer for an electrode material, the light output power of LED with graphene electrode was improved by ∼25%. This was attributed excellent graphene characteristics of high electrical conductivity, high optical transmittance of nearly 97% over a wide range of infrared, visible, and ultraviolet region and large area uniformity with fewer defects.
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