title: Efficiency enhancement of homoepitaxial InGaN/GaN light-emitting diodes on free-standing GaN substrate with double embedded SiO2 photonic crystals.
abstract: Homoepitaxially grown InGaN/GaN light emitting diodes (LEDs) with SiO2 nanodisks embedded in n-GaN and p-GaN as photonic crystal (PhC) structures by nanospherical-lens photolithography are presented and investigated. The introduction of SiO2 nanodisks doesn't produce the new dislocations and doesn't also result in the electrical deterioration of PhC LEDs. The light output power of homoepitaxial LEDs with embedded PhC and double PhC at 350 mA current is increased by 29.9% and 47.2%, respectively, compared to that without PhC. The corresponding light radiation patterns in PhC LEDs on GaN substrate show a narrow beam shape due to strong guided light extraction, with a view angle reduction of about 30°. The PhC LEDs are also analyzed in detail by finite-difference time-domain simulation (FDTD) to further reveal the emission characteristics.
authors: Tongbo
authors: T
authors: Wei
authors: Ziqiang
authors: Z
authors: Huo
authors: Yonghui
authors: Y
authors: Zhang
authors: Haiyang
authors: H
authors: Zheng
authors: Yu
authors: Y
authors: Chen
authors: Jiankun
authors: J
authors: Yang
authors: Qiang
authors: Q
authors: Hu
authors: Ruifei
authors: R
authors: Duan
authors: Junxi
authors: J
authors: Wang
authors: Yiping
authors: Y
authors: Zeng
authors: Jinmin
authors: J
authors: Li