High Light Extracting Efficiency of Gan-Based LED Based on Photonic Crystal

AbstractPhotonic crystal can control the radiation direction of the light. Using photonic crystal structure to enhance the light extraction efficiency of GaN-based LED is one of the important ways. In this paper, the extraordinary transmission characteristics of photonic crystal LED (PC-LED) are investigated by using the finite difference time domain method. Photonic crystal was designed in the both P-GaN layer and ITO layer, to maximize the inner light extraction of LED. We analyzed and simulated the influence of period, diameter and depth of the structure to the light extraction efficiency. With different parameters, we obtained optical values. The simulation results show that the enhancement factor of p-GaN PC-LED is larger than ITO layer PC-LED with the equal parameters