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

16 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 Dec 1

Fingerprint

Light emitting diodes
Polymers
light emitting diodes
Photons
ITO (semiconductors)
microbalances
resins
Refractive index
polymers
photons
Resins
refractivity
Nanoimprint lithography
Plasma applications
Aluminum Oxide
Reactive ion etching
Electroluminescence
Sapphire
electroluminescence
Nanostructures

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Improvement of photon extraction efficiency of gan-based led using micro and nano complex polymer structures. / Cho, Joong Yeon; Byeon, Kyeong Jae; Park, Hyoungwon; Kim, Jinseung; Kim, Hyeong Seok; Lee, Heon.

In: Nanoscale Research Letters, Vol. 6, 578, 01.12.2011, p. 1-6.

Research output: Contribution to journalArticle

Cho, Joong Yeon ; Byeon, Kyeong Jae ; Park, Hyoungwon ; Kim, Jinseung ; Kim, Hyeong Seok ; Lee, Heon. / Improvement of photon extraction efficiency of gan-based led using micro and nano complex polymer structures. In: Nanoscale Research Letters. 2011 ; Vol. 6. pp. 1-6.
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