Effects of nano-structured photonic crystals on light extraction enhancement of nitride light-emitting diodes

G. M. Wu, C. C. Yen, H. W. Chien, H. C. Lu, T. W. Chang, T. E. Nee

Research output: Contribution to journalJournal Article peer-review

10 Scopus citations

Abstract

The light extraction efficiency of an InGaN/GaN light-emitting diode (LED) can be enhanced by incorporating nano-structured photonic crystals inside the LED structure. We employed plane wave expansion (PWE) method and finite difference time domain (FDTD) method to reveal the optical confinement effects with the relevant parameters. The results showed that band-gap modulation could increase the efficiency for light extraction at the lattice constant of 200 nm and depth of 200 nm for the 468-nm LED. Focused ion beam (FIB) using Ga created the desired nano-structured patterns. The LED device micro-PL (photoluminescence) results have demonstrated that the triangular photonic crystal arrays could increase the peak illumination intensity by 58%. The peak wavelength remained unchanged. The integrated area under the illumination peak was increased by 75%. As the patterned area ratio was increased to 85%, the peak intensity enhancement was further improved to 91%, and the integrated area was achieved at 106%.

Original languageEnglish
Pages (from-to)5074-5077
Number of pages4
JournalThin Solid Films
Volume519
Issue number15
DOIs
StatePublished - 31 05 2011

Keywords

  • Focused ion beam
  • Light-emitting diode
  • Nanostructure
  • Photonic crystal

Fingerprint

Dive into the research topics of 'Effects of nano-structured photonic crystals on light extraction enhancement of nitride light-emitting diodes'. Together they form a unique fingerprint.

Cite this