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

JIUN-YEU CHEN1, YI-GENG LI2, JIA-YI YEH3, LIEN-WEN CHEN4, CHING-CHENG WANG2,*

Affiliation

  1. Center for General Education, Hsing Kuo University of Managementt, Tainan 709, Taiwan
  2. Institute of Manufacturing Engineering, National Cheng Kung University, Tainan 701, Taiwan
  3. Department of Management Information Science, Chung Hwa University of Medical Technology, Tainan 717, Taiwan
  4. Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan

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..

Keywords

Light-emitting diodes (LEDs), photonic crystals (PCs), photonic quasi-crystals (PQs), extraction enhancement.

Submitted at: Jan. 2, 2009
Accepted at: Feb. 24, 2009

Citation

JIUN-YEU CHEN, YI-GENG LI, JIA-YI YEH, LIEN-WEN CHEN, CHING-CHENG WANG, Improvement of external extraction efficiency in light-emitting diodes using an Archimedean tiling pattern: a parametric study, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 2, pp. 197-203 (2009)