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 language | English |
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Pages (from-to) | 197-203 |
Number of pages | 7 |
Journal | Journal of Optoelectronics and Advanced Materials |
Volume | 11 |
Issue number | 2 |
Publication status | Published - 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