Abstract

We investigated GaN-based vertical light-emitting diodes (VLEDs) with periodic and conical nanopillar arrays (CNAs) to improve the light-output efficiency. We found that a 470 nm diameter and 0.8–0.9 μm height increased the light output, and the devices suffered no significant electrical property degradations. The light-output power was 272% and 5.1% greater than flat- and rough-surface VLEDs at 350 mA, respectively. These improved optical properties are attributed to the optimized CNAs, which increase the effective photon escape cone and reduce the total internal reflection at the n-GaN–air interface. We also investigated the emission characteristics and mechanisms with finite-difference time-domain simulations.

© 2014 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Laser-induced periodic structures for light extraction efficiency enhancement of GaN-based light emitting diodes

Jiun-Ting Chen, Wei-Chih Lai, Yu-Jui Kao, Ya-Yu Yang, and Jinn-Kong Sheu
Opt. Express 20(5) 5689-5695 (2012)

Improving light extraction of InGaN-based light emitting diodes with a roughened p-GaN surface using CsCl nano-islands

Tongbo Wei, Qingfeng Kong, Junxi Wang, Jing Li, Yiping Zeng, Guohong Wang, Jinmin Li, Yuanxun Liao, and Futing Yi
Opt. Express 19(2) 1065-1071 (2011)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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