Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Journal of Display Technology
  • Vol. 9,
  • Issue 5,
  • pp. 359-364
  • (2013)

Enhancing LED Light Extraction by Optimizing Cavity and Waveguide Modes in Grating Structures

Not Accessible

Your library or personal account may give you access

Abstract

An optimization of light extraction efficiency (LEE) from light-emitting diodes (LEDs) is provided. The optimization is achieved when both the cavity and waveguide modes are in their best conditions and their emitted waves interfere constructively in the grating-assisted structures. In other words, high LEE appears when the structural parameters results in good cavity modes in both planar and grating structures, and also when the propagation direction of the fundamental waveguide mode is significantly converted to the direction normal to the grating surface by the gratings. In this paper, we use two simple equations, one for cavity modes and the other for waveguide modes, to predict the loci of the optimal structural parameters of gratings. The prediction is verified with the rigorous coupled wave analysis (RCWA). We systematically present an investigation of the various structural effects of gratings on the LEE of the thin film vertical gallium-nitride (GaN) based LEDs. The results show that ultra-high LEE can be achieved when the equivalent cavity thickness is good for fundamental cavity mode, the source is positioned around antinodes for both cavity and waveguide modes, there is significant diffraction, and the fundamental waveguide mode is largely converted to the normal direction to the air, and the emitted waves from fundamental cavity and waveguide modes interfere constructively.

© 2013 IEEE

PDF Article
More Like This
Enhanced light extraction from a GaN-based green light-emitting diode with hemicylindrical linear grating structure

Yuanhao Jin, Fenglei Yang, Qunqing Li, Zhendong Zhu, Jun Zhu, and Shoushan Fan
Opt. Express 20(14) 15818-15825 (2012)

Integrating remote reflector and air cavity into inclined sidewalls to enhance the light extraction efficiency for AlGaN-based DUV LEDs

Ji Zhang, Le Chang, Yuxin Zheng, Chunshuang Chu, Kangkai Tian, Chao Fan, Yonghui Zhang, and Zi-Hui Zhang
Opt. Express 28(11) 17035-17046 (2020)

Enhanced light extraction efficiency of an LED package by a surface-mounted amorphous photonic structure

Yiyong Chen, Zhizhong Chen, Fei Jiao, Jinglin Zhan, Zuojian Pan, Chuhan Deng, Xin Xi, Xiangning Kang, Weihua Chen, Qi Wang, Yuzhen Tong, Guoyi Zhang, and Bo Shen
Opt. Express 29(20) 31594-31606 (2021)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved