Patent ID: 9395406
Filing Date: 2016-07-19
CPC Classification: G01N,G01R,H01L

Claim Text:
1. A method of inspecting a semiconductor light-emitting device having an active layer, the method comprising: irradiating the semiconductor light-emitting device with light of a shorter wavelength than light emitted from the active layer, using an irradiating light source; capturing an image of photoluminescence emitted from the active layer upon the irradiation of the semiconductor light-emitting device, using an image sensor; extracting a region of the semiconductor light-emitting device from the captured image, as an inspection region, using a computer; calculating an average value of a photoluminescence intensity over pixels in the inspection region, using the computer; calculating a variation value indicating a degree of variation of the photoluminescence intensity over the pixels in the inspection region, using the computer; and determining that the semiconductor light-emitting device is defective upon determining that at least one of (i) the average value of the photoluminescence intensity is smaller than a predetermined first threshold, and (ii) the variation value is larger than a predetermined second threshold, using the computer.