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Title: Local Nanotip Arrays Sculptured by Atomic Force Microscope to Enhance the Light-Output Efficiency of GaN-based Light-emitting diode structures
Authors: Chun-Ying Huang
Yung-Chi Yao
Ya-Ju Lee
Tai-Yuan Lin
Wen-Jang Kao
Jih-Shang Hwang
Ying-Jay Yang
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: nanotips
light extraction efficiency
atomic force microscopy
Date: 2014
Issue Date: 2017-02-14T07:19:52Z
Publisher: Nanotechnology
Abstract: Abstract: In this work, local nanotip arrays on GaN-based light-emitting (LED) structures were fabricated through nano-oxidation using an atomic force microscope (AFM). The photoluminescence (PL) intensity of the InGaN/GaN multiple quantum wells (MQWs) active layer and the light
extraction efficiency of the LED structure were enhanced by forming this nanotips structure to serve as a graded-refractive index layer, which is further validated by the finite-difference timedomain analysis. The PL emission peak of the MQWs active layer has a blue-shift phenomenon that is caused by a partial reduction of the strain on the InGaN well. It is expected that our approach opens a promising route for simultaneously enhancing both the internal quantum efficiency and the light extraction efficiency of GaN-based LEDs. The proposed AFM-based method will be of importance for local patterning the light emitting components for optoelectronic applications.
Relation: 25(19)
Appears in Collections:[Institute of Optoelectronic Sciences] Periodical Articles

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