GaN-based light-emitting diode with three-dimensional silver reflectors

B. J. Kim, H. Jung, S. H. Kim, J. Bang, J. Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We present a simple and robust method to fabricate three-dimensional Ag reflectors on GaN light-emitting diodes (LEDs) using SiO2 nanospheres as the template. First, the hexagonal arrays of SiO2 nanosphere monolayer were spun-cast on a benzocyclobutene (BCB) layer, which was prepared on a sapphire surface. Then, the bottom half of the SiO2 nanospheres were embedded into the BCB layer after heating, resulting in arrays of "nano-lenses" that were in the shape of convex hemispheres. The concave-shaped hemisphere arrays were produced by etching the SiO2 nanospheres with an HF solution. Ag was deposited onto both patterns, concave and convex hemispheres, resulting in the formation of three-dimensional Ag reflectors. From the electroluminescence measurements, these Ag reflectors, which contained either concave or convex hemisphere patterns, were found to enhance the light output of GaN LEDs by as much as 29%-33%.

Original languageEnglish
Pages (from-to)700-702
Number of pages3
JournalIEEE Photonics Technology Letters
Volume21
Issue number11
DOIs
Publication statusPublished - 2009 Jun 1

Keywords

  • Light extraction efficiency
  • Light-emitting diodes (LEDs)
  • Reflector

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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