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. 2017 Feb 27;8:14558. doi: 10.1038/ncomms14558

Figure 2. Probing exciton localization from thin quantum well (QW) to thick (T) QW using time-resolved photoluminescence (TRPL).

Figure 2

(a) Pseudo colour TRPL plot shows spectra evolution with time of the MQWs film with injected exciton density of around 1 × 1016 cm−3. (b) The normalized PL decay curves extracted at the bilayer and TQW emission position as indicated in a, which clearly shows the concurrence of decay at the bilayer exciton resonance and building up at the TQW exciton resonance. (c) A comparison of the emission effective lifetime between exciton resonance at single layer QW in its pure film and at bilayer QW in the MQWs assembles. The solid lines are fittings according to theory described in the supplementary text. (d) The dependence of the TQWs emission build-up time on injected carrier density in the MQW assembled film. These results were obtained following excitation at 400 nm (1 KHz, 50 fs).