Colloidal ZnSe nanocrystals are coated with a ZnS shell and are investigated by means of
time-resolved photoluminescence spectroscopy. These nanocrystals are stable against
photooxidation and have photoluminescence quantum efficiencies around 15% even
months after the synthesis. Recombination processes are investigated as a function of the
excitation intensity and the emission energy. Nonlinear processes such as Auger
recombination dominate in the early times after the photogeneration of electron-hole pairs …