Measured 20-K PL and temperature-dependent PL spectra of chirped QDM bilayers. 20-K PL spectra of samples containing a single QDM layer or chirped QDM bilayer as active layers: (a) single 2/25/1.4 QDM reference (lower plot), and chirped 2/26/2.0 QDM1 bottom layer and 2/26/1.4 QDM2 top layer (upper); (b) single 1.9/6/1.7 QDM2 (lower), single 2/25/2.0 QDM1 (middle), and chirped QDM1/QDM2 bilayer (upper); and (c ) single 2/6/1.4 QDM2 (lower plot), and chirped 2/15/1.7 QDM1 and 2/6/1.4 QDM2 bilayer under nominal (top) and reduced excitations (middle). Temperature-dependent PL spectra of the chirped QDM bilayers in (a), (b) and (c) are shown in (d), (e), and (f), respectively. Dashed lines in (a to c) are multiple Gaussian function fits. Spectra are offset for clarity.
Patanasemakul et al. Nanoscale Research Letters 2012 7:207 doi:10.1186/1556-276X-7-207