Simulation for light power distribution of 3D InGaN/GaN MQW LED with textured surface

In this paper, we introduce a full 3D simulation for light power distribution of an InGaN/GaN MQW LED with textured surface. Device simulation was performed by APSYS software to get power distribution of light source inside the LED. Based on this, ray tracing simulation was carried out to get light power distribution outside the LED. During the process of ray tracing, the textured surface was treated as a special boundary which means its reflectivity, transmittance and refraction angle are not calculated according to Fresnel equations, but obtained from data extracted from Finite-difference time-domain(FDTD) method. By comparing ray tracing result with and without textured surface, we found that textured surface not only smoothed transmitted power distribution, but also greatly improved power extraction efficiency which can be further improved by changing texture geometry.