Light emitting device having light extraction structure

摘要

A light emitting device having a light extraction structure, which is capable of achieving an enhancement in light extraction efficiency and reliability, and a method for manufacturing the same. The light emitting device includes a semiconductor layer having a multi-layered structure including a light emission layer; and a light extraction structure formed on the semiconductor layer in a pattern having unit structures. Further, the wall of each of the unit structures is sloped at an angle of −45° to +45° from a virtual vertical line being parallel to a main light emitting direction of the light emitting device.

主权项

1. A method for manufacturing a light emitting device, the method comprising:
applying a mask layer on a dielectric layer on a semiconductor layer; forming a pattern into the mask layer, the pattern comprising unit structures, wherein the unit structures have a hole or a rod shape, and wherein a wall of the unit structures is sloped at an angle of −45° to +45°, from a virtual vertical line parallel to a light emitting direction of the light emitting device; forming a light extraction structure into the dielectric layer using the mask layer; and controlling an average filling factor of the pattern by adjusting at least one of a slope of the wall, a radius of the unit structures, and a lattice structure of the light extraction structure, wherein the average filling factor of the light extraction structure is more than 5% and less than 37% with respect to an area of a light emission surface of the light emitting device, and wherein the average filling factor is a ratio of an average area of the pattern with respect to a total area of a light emission surface of the light emitting device.