Patent ID: 8823020
Filing Date: 2014-09-02
Classification: H01L

Abstract:
1. An LED (light emitting diode) comprising: a substrate; a first n-type GaN layer, a connecting layer, a second n-type GaN layer, a light emitting layer, and a p-type GaN layer formed on the substrate in sequence, a top surface of the second n-type GaN layer away from the connecting layer comprising a first area and a second area, the light emitting layer, and the p-type GaN layer formed on the first area of the top surface of the second n-type GaN layer in sequence, the connecting layer being etchable by alkaline solution, an outer edge of a bottom surface of the second n-type GaN layer which connects the connecting layer having a roughened exposed portion, the GaN on the bottom surface of the second n-type GaN layer having an N-face polarity; a blind hole extending through the p-type GaN layer, the light emitting layer and the second n-type GaN layer to reach the connecting layer and expose the connecting layer; and an annular rough portion formed on the bottom surface of the second n-type GaN layer and surrounding the blind hole.