Abstract
We report on optical properties of CdS semiconductor nanocrystals doped 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 absorption, continuous and time resolved luminescence as well as photoluminescence excitation spectra at room temperature and at 10 K. The Mn2+ emission band associated to the 4T1 → 6A1 transition dominates the continuous luminescence spectrum and is the result of an energy transfer from the nanocrystals to the internal Mn2+ levels. Time resolved 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.
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