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Photoluminescence spectrum at 140 K. Shaded areas mark the parts of the spectrum selected for time resolved measurements. Inset shows the size distribution of the NCs size determined from HRTEM image.
Time resolved photoluminescence following a pulse of laser light at time zero measured at 637 nm (a) at 280 K together with the fitted curve (red line) and (b) at different temperatures. Due to periodic excitation with 400 ns period, the signal level at t < 0 indicates that not all excitons decayed before the pulse of laser at time t = 0. Inset to figure (a) shows residuals for the fitting.
Evolution of average decay constant, kav (a) and four single exponential components: k 1 (b), k 2 (c), k 3 (d), and k 4 (e) with temperature. Right hand scale indicates the pre-exponential factor, Ai , in the fitting.
Diagram of the exciton states present in the InP/ZnS nanocrystals.
Estimated splitting between defect state (at higher energy) and lowest exciton energy (dark exciton) as a function of the energy of emission (nanocrystal size).
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