Investigation of Electrode Pattern Design for Nitride-based Light Emitting Diodes

In this research, we study the influence of the electrode pattern design on turn-on voltage and conversation efficiency in light emitting diodes (LEDs). We found that some relationships existing between the pattern design of electrode and characteristics of samples. We designed several electrode patterns in the fixed sized LEDs. In our research, we found that the reduction of turn-on voltage is related to the increasing total length of P-electrode and N-electrode. Furthermore, we found that the reduction of turn-on voltage is also related to the parallel length of P electrode and N electrode. Base on the experiment results, we estimated the reduction of turn-on voltage is proportion to the total length of P electrode and N electrode. For conversation efficiency, we found it proportion to the area which deduct P electrode area from transparent conduction layer (TCL) and the area of P electrode paralleling N electrode.