Photonic crystal structure effect on the enhancement in the external quantum efficiency of a red LED

Taesung Kim, Paul O. Leisher, Aaron J. Danner, Ralph Wirth, Klaus Streubel, Kent D. Choquette

Research output: Contribution to journalArticlepeer-review

Abstract

The enhancement in external quantum efficiency of a red light-emitting diode (LED) from photonic crystal (PhC) hole patterns was investigated. A red LED was chosen because its epitaxial layers are relatively free from defects as compared to GaN-based LEDs. The peak emission wavelength was 642 nm, and a triangular-lattice PhC was designed with a hole diameter to lattice distance ratio of 0.5. The lattice distance to wavelength ratio (a/λ) was varied from 0.2 to 4.6 in order to evaluate the enhancement in the external quantum efficiency. An improvement in efficiency greater than 75% was obtained for a/λ between 0.6 and 2.0. This improvement of the optical characteristics occurred with unchanged electrical properties.

Original languageEnglish (US)
Pages (from-to)1876-1878
Number of pages3
JournalIEEE Photonics Technology Letters
Volume18
Issue number17
DOIs
StatePublished - Sep 1 2006

Keywords

  • Light-emitting diode (LED)
  • Photonic crystal (PhC)

ASJC Scopus subject areas

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

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