title: Enhancement of light extraction in GaN-based light-emitting diodes using rough beveled ZnO nanocone arrays.
abstract: A remarkable enhancement of light extraction efficiency in GaN-based blue light-emitting diodes (LEDs) with rough beveled ZnO nanocone arrays grown on the planar indium tin oxide (ITO) layer is reported. The light output power of LEDs with rough beveled ZnO nanocone arrays was increased by about 110% at 20 mA compared with conventional LEDs with planar ITO. The light extraction efficiency of GaN-based LEDs with rough-beveled ZnO nanocones is measured much greater than with smooth-surface hexagonal ZnO nanorods. The light-ray tracing analysis showed that ZnO nanocones with rough surfaces enlarge the light escape cone of GaN-based LEDs and have a greater advantage for extracting light compared with ZnO nanorods.
authors.affiliation: State Key Laboratory of Crystal Materials, Center of Bio & Micro/nano Functional Materials, Shandong University, Jinan, China.
authors.forename: Zhengmao
authors.initials: Z
authors.lastname: Yin
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Liu
authors.forename: Yongzhong
authors.initials: Y
authors.lastname: Wu
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Hao
authors.forename: Xiangang
authors.initials: X
authors.lastname: Xu
mesh_terms: D005708:Gallium / Q000737:chemistry*; D008029:Lighting / Q000295:instrumentation*; D008855:Microscopy, Electron, Scanning; D008962:Models, Theoretical; D053758:Nanoparticles; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D043942:Nanotubes; D055096:Optical Devices; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: C473348:gallium nitride; D005708:Gallium; D015034:Zinc Oxide