Improvement of the light extraction efficiency of GaN-based LEDs using rolled-up nanotube arrays

被引：13
作者：
Djavid, M. [1 ]
Liu, X. [1 ]
Mi, Z. [1 ]
机构：
[1] McGill Univ, Dept Elect & Comp Engn, Montreal, PQ H3A 0E9, Canada
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 25期
基金：
加拿大自然科学与工程研究理事会;
关键词：
EMITTING-DIODES; REFRACTIVE-INDEX; SOLID-STATE; SILICON; ENHANCEMENT; PERFORMANCE; OUTPUT; BLUE;
D O I：
10.1364/OE.22.0A1680
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, we have investigated the effect of rolled-up nanotubes on the light extraction efficiency of GaN-based LEDs using two-dimensional finite element method simulation. The light extraction involves two successive steps, including the coupling from the light source to the tube and the subsequent emission from the tube to the air. Significantly enhanced light extraction efficiency is observed for both TE and TM waves by optimizing the nanotube geometry and dimension as well as the separation between the nanotube and light source. We have further shown that densely packed nanotube arrays can be integrated with GaN-based LEDs to achieve unequivocal improvement of light extraction efficiency over a large surface area. With recent advances in rolled-up micro- and nanotubes, it is expected that this study can offer a potentially flexible, low cost approach to enhance the light extraction of various LED devices. (C)2014 Optical Society of America
引用
收藏
页码：A1680 / A1686
页数：7
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