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Results of CWPL experiments on -doped QDs (dashed curve), -doped QDs (dotted curve) and undoped QDs (solid curve). The pump wavelength is . The data are normalized to the peak emission from the ground state optical transition for each QD structure (Ref. 17). Peaks associated with emission from the GaAs substrate and InAs wetting layer (WL) are also indicated.
(a) TRPL results for -doped QDs (triangles), -doped QDs (circles), and undoped QDs (squares) at with an optical excitation density of 0.6 electron–hole pairs per QD at . The solid curves indicate fits of the PL rise to a single exponential with time constants of (-doped QDs), (-doped QDs), and (undoped QDs).
(a) Time constants extracted from single exponential fits to the rising edge of the TRPL versus the number of optically injected electron–hole pairs per QD at for -doped QDs (triangles), -doped QDs (circles), and undoped QDs (squares); (b) Temperature dependence of the PL rise time for low excitation density.
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