Improvement of photon extraction efficiency of gan-based led using micro and nano complex polymer structures

Joong Yeon Cho, Kyeong Jae Byeon, Hyoungwon Park, Jinseung Kim, Hyeong Seok Kim, Heon Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A micro- and nanoscale complex structure made of a high refractive index polymer (n = 2.08) was formed on the ITO electrode layer of an edge-emitting type GaN blue light-emitting diode (LED), in order to improve the photon extraction efficiency by suppressing total internal reflection of photons. The nanoimprint lithography process was used to form the micro- and nanoscale complex structures, using a polymer resin with dispersed TiO2 nanoparticles as an imprint resin. Plasma processing, such as reactive ion etching, was used to form the micro- and nano-scale complex structure; thus, plasma-induced damage to the LED device can be avoided. Due to the high refractive index polymeric micro- and nanostructure on the ITO layer, the electroluminescence emission was increased up to 20%, compared to an identical LED that was grown on a patterned sapphire substrate to improve photon extraction efficiency.

Original languageEnglish
Article number578
Pages (from-to)1-6
Number of pages6
JournalNanoscale Research Letters
Volume6
DOIs
Publication statusPublished - 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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