Room temperature PL spectra of four-bilayer samples. With the Si spacer overgrowth at 520 °C (sample A), 550 °C (sample B), and 580 °C (sample C). The PL decrease around 1,460 nm induce by the color filter of instrumentation is marked by a line.
Liu et al. Nanoscale Research Letters 2012 7:383 doi:10.1186/1556-276X-7-383