Abstract
The dynamics of absorption bleaching in CdS nanocrystalline thin films were studied in the temperature interval 10-300 K and three distinct decay time constants (sub-ps, ps, and ns) were identified. We interpreted the dynamics in terms of three groups of nanocrystals with specific defects and showed that two of them are related. A close link between the temperature behaviour of the photoluminescence efficiency and that of the relative amplitude of the nanosecond component was observed and an explanation based on a microscopical model was proposed. The optical nonlinearities were studied by self-diffraction technique. A dephasing time constant shorter than 80 fs and a value of |X 3 | 6 x 10 -16 m 2 V -2 were obtained.
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