OPTICAL-PROPERTIES OF MN-DOPED CDS NANOCRYSTALS

We report on optical properties of CdS semiconductor nanocrystals dope d with manganese ions which have been successfully prepared using the inverted micelle technique. The effects of quantum confinement on the emission properties of the manganese ions are studied by means of abso rption, continuous and time resolved luminescence as well as photolumi nescence excitation spectra at room temperature and at 10 K. The Mn2emission band associated to the T-4(1) --> (6)A(1) transition dominate s the continuous luminescence spectrum and is the result of an energy transfer from the nanocrystals to the internal Mn2+ levels. Time resol ved experiments clearly show that the Mn2+ lifetime is not affected by confinement in the nanocrystals and is of the same order of magnitude as in bulk CdS.