Effects of Electrode Structure on The Current Distribution of AlGaInP-LED Array

An array of 320×240 micro-LED is designed based on AlGaInP epitaxial wafer.The pixel size is 100 μm×100 μm.The optical properties of LED array are affected by the current crowding effect,which is a universal problem in LED array.By simulating the active layer current distribution,effects of some factors including electrode structure,width of electrode and distance between electrodes on the current distribution of LED array are studied.The tri-strip electrode is proposed as an optimized structure of the top electrode.Considering some important details such as the light shading effect,the tri-strip electrode is the best electrode shape comparing with one-strip electrode and bi-strip electrode.The optimized electrode leads to the more uniform current spreading.The uniform lighting area of active layer increase 65.02% and 25.63% than that one strip electrode and bi-strip electrode,respectively.The light emission efficiency of the micro-LED array can be improved.