Figure 3.

PL spectra obtained at different Pexc for islands on a planar Si(001) substrate. The island PL shifts strongly with increasing excitation power from 0.77 eV at Pexc = 16 mW/cm2 to 0.86 eV at Pexc = 244.3 W/cm2. The detector cut-off at 0.77 eV is indicated by the dashed line. The spectra are shifted vertically for clarity

Brehm et al. Nanoscale Research Letters 2010 5:1868-1872   doi:10.1007/s11671-010-9713-z