Fig. 7From: Electronic States of Nanocrystal Doped with Oxygen and Visible Emission on Black Silicon Prepared by ns-LaserThe emission model depiction from the analysis of the PL decay spectra on Si NCs with various diameters, in which the direct-gap emission relates to the faster photons on the smaller NCs (diameters <2 nm), and the indirect-gap emission relates to the slower photons (involving phonon assistance process) on the larger NCs (diameters >2.5 nm)Back to article page