▎ 摘　　要

Pyramid array InGaN/GaN core-shell light-emitting diodes (LEDs) were fabricated by using a highly homogeneous multilayer graphene transparent conducting electrode. This novel electrode exhibited excellent optical, structural, and electrical properties. In this design, graphene connected each pyramid array as a top window electrode. The current-driven pyramid array InGaN/GaN core-shell LED was operated at a low current injection and exhibited bright electroluminescence. Our results suggest that graphene offers excellent current spreading and transparent conductive properties for nano- or microscale devices. (c) 2013 The Japan Society of Applied Physics