Light Extraction Improvement From GaN-Based Light-Emitting Diodes With Nano-Patterned Surface Using Anodic Aluminum Oxide Template

An improvement of light extraction from GaN-based light-emitting diodes (LEDs) was demonstrated by forming surface nano-structures using an anodic aluminum oxide (AAO) template as a dry etching mask. Nano-pores were simultaneously formed on indium tin oxide and GaN surfaces of LED with different pore depths by the same procedural steps, with a pore density and pore diameter of 1.1 x 10(9)/cm(2) and.163 +/- 31 nm, respectively. The nano-patterned LEDs achieved a top-face light output power enhancement of 72% compared to the conventional LEDs at 20 mA. The light extraction effects of the nano-structures on the trapped optical modes in LED were revealed by scanning electron microscopy and microscopic electroluminescence.Engineering, Electrical & ElectronicOpticsPhysics, AppliedSCI(E)EI0ARTICLE21-241974-19762