Open AccessEnhancement of light extraction in GaN-based light-emitting diodes using rough beveled ZnO nanocone arrays
Author(s) -
Zhengmao Yin,
Xiaoyan Liu,
Yongzhong Wu,
Xiaopeng Hao,
Xiangang Xu
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.001013
Subject(s) - light emitting diode , materials science , bevel , optoelectronics , nanorod , indium tin oxide , diode , planar , indium gallium nitride , gallium nitride , green light , optics , wide bandgap semiconductor , layer (electronics) , nanotechnology , blue light , computer graphics (images) , physics , structural engineering , computer science , engineering
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.