High-brightness vertical gan-based light-emitting diodes with hexagonally close-packed micrometer array structures

Kyeong Jae Byeon, Joong Yeon Cho, June O. Song, Sang Youl Lee, Heon Lee

Research output: Contribution to journalArticle

9 Citations (Scopus)


A high-brightness GaN-based vertical light-emitting diode (VLED) was demonstrated by introducing a large-area low-cost direct printing process. A hexagonally close-packed micrometer convex array was fabricated on the n-GaN top layer of the VLED by direct printing using a hydrogen silsesquioxane solution and subsequent inductively coupled plasma etching. To confirm that the enhancement of light extraction by this structure, a conventional wet-chemical-etched structure was also fabricated on the n-GaN top layer of the VLED, yielding randomly oriented pyramid structures on the layer. Both VLEDs showed much stronger electroluminescence emission than an unpatterned VLED. However, the micrometer convex array improved the light extraction significantly more than the random pyramid structure owing to its greater ability to enlarge the light escape cone, attributed to its 50°-tapered profile and large extraction area. After chip packaging with silicone encapsulation, the light output power of the micropatterned VLED was 11.4% and 106% greater than those of the wet-etched and unpatterned VLEDs, respectively, under a 350-mA drive current.

Original languageEnglish
Article number6678212
JournalIEEE Photonics Journal
Issue number6
Publication statusPublished - 2013 Dec 1



  • Light-emitting diodes (LEDs)
  • microstructure fabrication

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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