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(Color online) PL spectrum of the ZnO sample for the first 20 ps after the excitation. The lattice temperature is set to 10 K and the excitation fluence to 1.5 × 1011 photons/cm2 per pulse. The inset shows a magnification of the transition with the corresponding Lorenzian fit curve (grey-shaded area).
(Color online) (a) Normalized transients of the , , and DX transitions. (b) Results of the rate-equation model. A simplified scheme of the model is shown on top of the graph. The detected excitation pulse corresponding to the temporal resolution of the setup is shown in grey.
(Color online) PL spectra as function of excitation density at T = 10 K with n 0 = 1.5 × 1011 photons/cm2 per pulse (a) and as function of temperature for the constant photon flux n0 (b). The excitation density and the temperature intervals are factors of 3 and 20 K, respectively. The spectra are normalized and shifted for clarity.
(Color online) Relaxation time of the (n = 2) to (n = 1) excitonic transition as function of excitation density (a) and temperature (b).
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