Femtosecond pump-probe studies of CdSe microcrystals embedded in a germanium dioxide glass matrix

We report here results of experiments on the transient absorption spectra of CdSe microcrystals embedded in a germanium dioxide glass matrix. The transient absorption spectra were measured by means of femtosecond pump-probe method. In the sample with the smaller microcrystal size within the category of the strong confinement regime (the individual particles confinement regime), the absorption bleachings due to the carrier dynamics in the quasi-zero- dimensional quantum confined states were observed. In the sample with the larger microcrystal size within the category of the weak confinement regime (the exciton confinement regime), the absorption bleachings due to the hot carrier in the 3D electronic states were studied at various excitation intensities.

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