A boosted enhancement of light extraction from GaN-based light-emitting diodes (LEDs) with a 3-dimensional nanocone-shaped platform

We report on dramatically enhanced light extraction from GaN-based light-emitting diodes (LEDs) with a 3-dimensional nanocone-shaped platform on a p-GaN surface. The nanocone-shaped platform LEDs were fabricated by using nanoimprint lithography (NIL) with a flexible nanostamp replicated from a well-ordered anodic alumina template. These soft lithographic approaches make it possible to pattern efficiently over a large area with a high-resolution. When we compared our LEDs with a nanocone-shaped platform to other conventional planar LEDs, unexpectedly, we observed boosted light extraction from the LEDs with a nanocone-shaped platform. That is mainly ascribed to the engraved nanocone-shaped patterns on the p-GaN surface, which provided a more favorable environment for photon extraction.