Patent ID: 8043872

Claim:
A method for manufacturing an epitaxial material used for a GaN based LED with a low polarization effect, characterized in that said method comprises steps of: tunneling a electron or a hole of a quantum well with a smaller energy gap into the quantum well with a larger energy gap during a process of growing a polarized epitaxial material used for the GaN based LED, so as to increase light emission efficiency of the quantum well of the polarized epitaxial material; simultaneously, during the process of growing the polarized epitaxial material used for the GaN based LED, reducing polarization effect of the quantum well having the low polarization effect with the quantum well having a high polarization effect and a large interface charge by utilizing a different interface charge of the quantum well caused by a different polarization effect, so as to increase overlapping of the electron or the hole of the quantum well to increase light emission intensity of the polarized epitaxial material used for the GaN based LED; thereby growing a low polarizing active layer that is composed of an InAlGaN multi-quantum well structure polarized regulating and controlling layer and an InAlGaN multi-quantum well structure light emitting layer; wherein: said quantum well with a long wavelength of a lower energy band is the InAlGaN multi-quantum well structure polarized regulating and controlling layer having a smaller designed energy gap ranged from 2.0 eV to 4.95 eV; said quantum well with a short wavelength of a higher energy band is the InAlGaN multi-quantum well structure light emitting layer having a larger designed energy gap ranged from 2.05 eV to 5.0 eV; the smaller designed energy gap is 50 meV to 400 meV less than the larger designed energy gap; said quantum well with the high polarization effect and the large interface charge is the quantum well having an interface charge ranged from 1×10 13 C/cm 2 to 5×10 14 C/cm 2 ; and said quantum well with the low polarization effect is the quantum well having an interface charge ranged from 5×10 11 C/cm 2 to 1×10 14 C/cm 2 .