Fig. 2From: Electronic States of Nanocrystal Doped with Oxygen and Visible Emission on Black Silicon Prepared by ns-Laser a PL spectra from 300 to 500 nm measured at lower temperature on the sample I (black curve) and the sample II (red curve). b PL spectra measured at room temperature on the sample I (black curve) and the sample II (red curve), in which the impurity states on nanocrystals are exhibited in the broader enhanced PL peaks on the sample IIBack to article page