Patent ID: 8597961

Claim:
A method for improving internal quantum efficiency of a group-III nitride-based light emitting device, comprising the steps of: providing am undoped group-III nitride-based substrate having a single crystalline structure; coating a gel solution on the group-III nitride-based substrate; annealing the gel solution at an annealing temperature no higher than 150° C. to form a ZnO seed layer; immersing the ZnO seed layer in a growth solution, and then heating the ZnO seed layer in a dryer to form a ZnO layer having a plurality of ZnO particles, without absorption of visible light, size, shape, and density of the ZnO particles are controlled by reaction concentration ratio of nitrogen/hydrogen, reaction time and reaction temperature; and growing a group-III nitride-based layer over the ZnO layer; wherein the ZnO layer prevents threading dislocation of the undoped group-III nitride-based substrate from propagating into the group-III nitride-based layer, thereby improving internal quantum efficiency of the group-III nitride-based light emitting device.