Improvement of external extraction efficiency in light-emitting diodes using an Archimedean tiling pattern: A parametric study

Jiun Yeu Chen, Yi Geng Li, Jia Yi Yeh, Lien-Wen Chen, Ching Cheng Wang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A theoretical discussion on the efficiency of light extraction is presented for the parameter optimization concept of the light-emitting diodes (LEDs) using a two-dimensional photonic crystal (PC). Several photonic systems of square and Archimedean lattices are investigated based on a simple design method for an efficient light output from the viewpoint of Bragg diffraction. According to the photonic band diagram, the radiation modes near the operation eigenfrequency above the light lines are used to extract light from the PC-based LED into the free space. The predicted design parameters for the optimal light extraction are qualitatively consistent with the results of three-dimensional finite-element-method simulations. The extraction efficiency could be improved by a factor of ∼3 compared to that of an LED device without the PC pattern by adding an Archimedean tiling of circular pillars in the device.

Original languageEnglish
Pages (from-to)197-203
Number of pages7
JournalJournal of Optoelectronics and Advanced Materials
Volume11
Issue number2
Publication statusPublished - 2009 Feb 1

All Science Journal Classification (ASJC) codes

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

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