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Representative cathodoluminescence spectra showing the QD transitions of samples A–D, measured at , at acceleration voltage of , and beam current of . Arrows denote the ground state transitions, and the shaded area depicts the energy of the lowest subband transition in the VQWR barrier.
Histograms showing the distribution of emission energies for samples A–D. Solid lines are Gaussian fits to the data. The quoted errors in the FWHM correspond to differences in the Gaussian fits that were obtained when different binning intervals were chosen for the histograms of the emission energy distribution.
(Color online) Variations of the FWHM (left ordinate, squares) and the corresponding estimated thickness variations in monolayers (±, right ordinate, triangles), versus dot height for samples A–D. The dotted and dashed lines connecting the FWHM and , respectively, are a guide to the eye. The error bars are statistical errors and derive directly from the errors in the FWHM given in Fig. 2. The inset shows the calculated -state energies (solid line) and the CL -state emission energies (dots) as a function of dot height.
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