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Timeresolved PL spectra for two MQW samples obtained at 2 K with excitation at 3.6 eV. The time interval between each spectrum is 0.8 ns. In (a) left panel, are shown spectra for the undoped sample D1 in Figure 6, and in (b) right panel, are shown corresponding data for the doped sample D3 in Figure 6. Note the strong spectral shift between the two samples.
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