GaN-based LEDs with flower shape ZnO nanorods by SILAR-based and hydrothermal methods

The authors applied a simple and low-cost successive ionic layer adsorption and reaction (SILAR) and hydrothermal method (Hm) methods to form ZnO nanorods with the flower shape for GaN-based light-emitting diodes (LEDs). With 20 mA current injection, it was found that forward voltages were all 3.4 V when the 20mA output powers were 2.36, 2.69, 3.04, 3.24, and 3.0 mW for LED I, LED II, LED III, LED IV, and LED V, respectively. Furthermore, it was also found that the formation of ZnO nanorods on the top of ITO surface did not degrade the electrical properties.