Fabricating method of semiconductor light-emitting device
View Patent ↗A fabricating method of a semiconductor light-emitting device includes the step of forming a wafer including a multi-layered semiconductor film epitaxially grown on a base substrate and containing an active layer, the step of performing pass/fail judgment of the active layer by photo-exciting the active layer in the wafer and by measuring emission intensity from the active layer at least at two temperature points, and the step of forming a light-emitting device structure with the multi-layered semiconductor film containing the active layer judged to be of good quality in the pass/fail judgment.
1. A fabricating method of a semiconductor light-emitting device, comprising the steps of:
forming a wafer including a multi-layered semiconductor film epitaxially grown on a base substrate and containing an active layer;
performing pass/fail judgment of said active layer by photo-exciting said active layer in said wafer and by measuring emission intensity from the active layer at least at two temperature points; and
forming a light-emitting device structure with said multi-layered semiconductor film containing said active layer judged to be of good quality in said pass/fail judgment.
2. The fabricating method of a semiconductor light-emitting device according to claim 1 , wherein said step of performing pass/fail judgment of said active layer is carried out before or during said step of forming the light-emitting device structure.
3. The fabricating method of a semiconductor light-emitting device according to claim 1 , wherein light of a wavelength that can selectively excite said active layer is used for said photo-excitation.
4. The fabricating method of a semiconductor light-emitting device according to claim 1 , wherein among said at least two temperature points, the lowest temperature point is in a range of lower than 150K and the highest temperature point is in a range of higher than 230 K and lower than 550 K.
5. The fabricating method of a semiconductor light-emitting device according to claim 1 , wherein a density of carriers caused in said active layer by said photo-excitation is in a range of more than 1/100 and less than 100 times a carrier density of said semiconductor light-emitting device that is under a condition of being injected with a rated current density.
6. The fabricating method of a semiconductor light-emitting device according to claim 1 , wherein said pass/fail judgment is carried out based on whether a ratio of said emission intensity at a temperature point of higher than 230 K and lower than 550 K to that at a temperature point of lower than 150 K is greater than a prescribed reference value.
7. A semiconductor light-emitting device fabricated by the method recited in claim 1 , wherein said multi-layered semiconductor film contains a layer of nitride-based compound semiconductor (In x Al y Ga 1-x-y N: 0≦x, 0≦y, x+y<1).