PL spectrum from the ensemble of QDs. Excitation wavelength is . The thick upward arrow indicates the energy of the continuous-wave laser used for single dot spectroscopy.
PL spectra from different mesa sizes (a)–(c) and from the area where QDs were completely removed (d).
PL spectra at excitation powers of , , and . The circles show experimental data, and the solid lines show fitting results using a Lorenzian function. At the excitation power of , we took account of two additional peaks for fitting. (Fitting curves are not shown.) One peak is below the energy of (Gaussian function) and the other one is at the higher-energy side of XX (Lorenzian function).
Integrated intensity as a function of excitation power on logarithmic scales. The integrated intensities were obtained by fitting the spectrum to Lorenzian function. The lines show the slopes of individual peaks.
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