Patent ID: 8404504

Claim:
A method for making a light emitting diode, comprising: providing a light emitting diode chip, wherein the light emitting diode chip comprises a first semiconductor layer, an active layer, and a second semiconductor layer stacked on a surface of a substrate in that order; locating a patterned mask layer on a surface of the second semiconductor layer, wherein the patterned mask layer comprises a plurality of bar-shaped protruding structures aligned side by side, and a slot is defined between each two adjacent protruding structures of the plurality of protruding structures to expose a portion of the second semiconductor layer; etching the exposed portion of the second semiconductor layer such that the each two adjacent protruding structures begin to slant face to face until they are contacting each other to form a protruding pair; forming a plurality of M-shaped three-dimensional nano-structures on the surface of the second semiconductor layer by removing the mask layer; exposing a portion of the first semiconductor layer by removing a part of the second semiconductor layer and the active layer; applying a first electrode to electrically connect with the first semiconductor layer on the exposed first semiconductor layer; and applying a second electrode to electrically connect with the second semiconductor layer.