Light emitting diode

A light emitting diode, comprising:

• a first semiconductor layer;
• a second semiconductor layer having a light emitting surface;
• an active layer sandwiched between the first semiconductor layer and the second semiconductor layer, the light emitting surface being away from the active layer;
• a first electrode electrically connected with the first semiconductor layer;
• a second electrode electrically connected with the second semiconductor layer;
• and
• a plurality of three-dimensional nano-structures located on the light emitting surface, wherein each of plurality of three-dimensional nano-structures comprises a first peak and a second peak aligned side by side, a first groove is defined between the first peak and the second peak, a second groove is defined between each two adjacent three-dimensional nano-structures of the plurality of three-dimensional nano-structures, and a depth of the first groove is less than that of the second groove.

A light emitting diode, comprising:

• a first semiconductor layer;
• a second semiconductor layer having a light emitting surface;
• an active layer sandwiched between the first semiconductor layer and the second semiconductor layer, the light emitting surface being away from the active layer;
• a first electrode covering an entire surface of the first semiconductor layer;
• a second electrode electrically connected with the second semiconductor layer;
• and
• a plurality of three-dimensional nano-structures located on the light emitting surface aligned side by side and extending substantially along the same direction, and a cross-section of each of the thee three-dimensional nano-structures is M-shaped.