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Quantum dots made from II–VI and I–VII semiconductors and embedded in glasses have been investigated by means of linear and nonlinear optical methods. The different experiments cover the time range between a few tens of femtoseconds up to nanoseconds and seconds. The studies comprise the ultrashort phase relaxation times, the gain build-up and decay times, the one- and two-pair direct recombination...
An overview will be given of similarities and differences in the optical properties of two kinds of quantum-confined II–VI semiconductors, nanocrystals and epitaxially grown islands. In both systems, Coulomb correlation energies have been observed which are up to ten times larger than those in III–V semiconductor materials. This peculiarity makes II–VI semiconductor quantum dots interesting objects...
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