Improved Uniformity of Current Distribution in Nanohole Light-Emitting Diode

Abstract

Nanohole light-emitting diodes (NHLED) is designed based on three-dimensional thermoelectric coupling simulation. By etching nanoholes through active layer, uniformity of current distribution is improved. Furthermore, an experimental NHLED sample is fabricated and tested. Experimental data and initial simulation result have good coincidence. This proves the validity of simulation model. By going deep to the simulation model, we find model with low-resistance transparent conductive layer (TCL) performs better uniformity. Then the effect of nonradiative-recombination heat is considered. When the input current is comparatively low, the effect of nonradiative-recombination heat is slight. In addition, effects on uniformity with different input current is discussed. When current density is comparatively low, NHLED performs 3-folds better uniformity than its counterpart without nanoholes. To further improve the uniformity of current distribution, the size of chip and period of nanoholes are discussed. To ensure NHLED performs impressive improvement on current uniformity, chips should be with big size, small period and used for comparatively low input current situation.