The dispersion of nickel nanoparticles was prepared by ultrasonic treatment using absolute ethyl alcohol as solvent and citric acid as dispersion medium,respectively.Then the dispersion was spin-coated on the indium tin oxide(ITO) current spreading layer of GaN-based light-emitting diodes(LEDs) to form a single-layer nickel nanoparticle,and the ITO surface was textured using inductively coupled plasma(ICP) etching technology by using nickel nanoparticles as the etching mask.The light output power of ITO sur...