Enhanced light extraction of light-emitting diodes via nano-honeycomb photonic crystals

被引：24

作者：

Fu, Po-Han ^{[1
]}

Lin, Guan-Jhong ^{[1
]}

Wang, Hsin-Ping ^{[1
]}

Lai, Kun-Yu ^{[2
]}

He, Jr-Hau ^{[1
,3
]}

机构：

[1] Natl Taiwan Univ, Inst Photon & Optoelect, Taipei 10617, Taiwan

[2] Natl Cent Univ, Dept Opt & Photon, Chungli 32001, Taiwan

[3] Natl Taiwan Univ, Dept Elect Engn, Taipei 10617, Taiwan

来源：

NANO ENERGY | 2014年 / 8卷

关键词：

Light emitting diodes; Multiple quantum wells; Photonic crystals; Light extraction; Nanosphere lithography; SOLAR-CELLS; EFFICIENCY; LEDS;

D O I：

10.1016/j.nanoen.2014.05.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present an effective light extraction scheme for GaN-based multi-quantum-well (MQW) light emitting diodes with periodic SiO2 nano-honeycomb arrays fabricated by natural lithography and reactive ion etching. The nano-honeycombs significantly boost light output by providing additional light extraction channels, not only guiding the internal modes into air but also alleviating the sever droop effect at high input power. At the driving current of 400 mA, light output power through the nano-honeycombs is 77.8% higher than that of the bare device. In addition, the output power is particularly enhanced at the diffraction angle around 65, which is attributed to the intensive first order diffraction on the honeycombs. Simulations based on finite-difference time-domain method are also carried out to reveal the field distribution across device interfaces. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：78 / 83

页数：6

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