Light-emitting diode structure with reflective layer for improving luminous efficiency thereof

A light-emitting diode structure, comprising:

• a first type semiconductor layer;
• a light-emitting layer disposed under the first type semiconductor layer;
• a second type semiconductor layer disposed under the light-emitting layer, wherein the second type semiconductor layer comprises a plurality of protruding portions which are protruded from a lower surface of the second type semiconductor layer in a direction away from the light-emitting layer;
• an ohmic contact layer disposed under the protruding portions;
• a reflective layer disposed under the lower surface of the second type semiconductor layer and surrounding the protruding portions, the reflective layer at least covering an entirety of the lower surface of the second type semiconductor layer except for portions of the lower surface of the second type semiconductor layer having the protruding portions thereon and including two stacked thin films having different refractive indices than each other;
• an electrical connection layer covering the reflective layer and the ohmic contact layer;
• and
• an electrode in contact with the electrical connection layer.

A light-emitting diode structure, comprising:

• a first type semiconductor layer;
• a light-emitting layer disposed under the first type semiconductor layer;
• a second type semiconductor layer disposed under the light-emitting layer, wherein the second type semiconductor layer comprises a plurality of protruding portions which are protruded from a lower surface of the second type semiconductor layer in a direction away from the light-emitting layer;
• an ohmic contact layer disposed under the protruding portions;
• a reflective layer disposed under the lower surface of the second type semiconductor layer and laterally surrounding an entirety of the protruding portions, the reflective layer including two stacked thin films having different refractive indices than each other;
• an electrical connection layer covering the reflective layer and the ohmic contact layer;
• and
• an electrode in contact with the electrical connection layer.