Patent ID: 8829652
Filing Date: 2014-09-09
Classification: B82Y,H01L,H01S

Abstract:
1. A light emitting device with graded composition hole tunneling layer and an energy blocking layer, wherein the graded composition hole tunneling layer comprises a plurality of pairs of indium gallium nitride (InGaN)/indium gallium aluminum nitride (AlxInyGa 1-x-y N), a thickness of the graded composition layer is about 3 nm to 15 nm, the energy blocking layer of the graded composition layer is increased gradually from an n-type semiconductor layer direction to a p-type semiconductor layer direction, the light emitting device is selected from the group consisting of a light emitting diode, a semiconductor laser and a laser diode, comprising: a substrate, wherein the substrate is selected from the group consisting of zinc oxide (ZnO), silicon, spinel (MgAl an n-type semiconductor layer disposed on the substrate, wherein the n-type semiconductor layer comprises a first portion and a second portion; a graded composition hole tunneling layer disposed on the first portion of the n-type semiconductor layer, wherein the graded composition hole tunneling layer comprises a plurality of pairs of indium gallium nitride (InGaN)/indium gallium aluminum nitride (AlxInyGa an electron blocking layer disposed on the graded composition hole tunneling layer, wherein the electron blocking layer is an indium gallium aluminum nitride (AlxInyGa a p-type semiconductor layer disposed on the electron blocking layer; a first electrode disposed on the p-type semiconductor layer; and a second electrode disposed on the second portion of the n-type semiconductor layer and insulated from the first portion of the n-type semiconductor, wherein a charge of the second electrode and the first electrode is opposite.