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Low magnification TEM image of tetrapod-shaped CdTe nanocrystals. The scale bar is long. Inset: PL recorded at room temperature.
Typical normalized time resolved PL traces of GS (open symbols) and EX (full symbols) for CdTe tetrapods, recorded at and at excitation density of . The white lines represent the best fit to Eq. (1).
Temporal evolution of the PL spectrum at excitation density of . The data were taken in a wide window. Dotted line is a guide for eyes evidencing the remarkable dynamical shift of the GS.
(a) Temporal evolution of the GS and EX PL intensity ratio. (b) Plot of the dynamical shift of the GS emission energy (symbols) and relative best fit (continuous line) to a biexponential function. The data refer to the transient spectra reported in Fig. 3.
Best fit values of the lifetimes and the relative weights for the GS and for the EX as a function of the excitation density.
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