Patent ID: 8450749
Filing Date: 2013-05-28
Classification: H01L

Abstract:
1. A light emitting element, comprising: a substrate; a GaN layer on the substrate; a first low refractive index semiconductor layer on the GaN layer, the first low refractive index semiconductor layer having a first top surface; a second low refractive index semiconductor layer embedded in the first low refractive index semiconductor layer, the second low refractive index semiconductor layer having a second top surface; and a lighting structure having a high refractive index on the first top surface of the first low refractive index semiconductor layer and the second top surface of the second low refractive index semiconductor layer, wherein a lattice mismatch exists between the first low refractive index semiconductor layer and the GaN layer, the lighting structure being a GaN lighting structure including an n-type GaN semiconductor layer on the first and second top surfaces of the first and second low refractive index semiconductor layers, a multiple quantum wells layer (MQWs) on the n-type GaN layer, and a p-type GaN semiconductor layer on the multiple quantum wells layer; wherein light generated by the multiple quantum wells layer toward the substrate is reflected by the first top surface of the first low refractive index semiconductor layer and the second top surface of the second low refractive index semiconductor layer embedded in the first low refractive index semiconductor layer; and wherein a size of each of the cracks of the second low refractive index semiconductor layer is not less than 1 μm and not exceeding 100 μm.