Spectroscopy of dielectric nanocrystals doped by rare-earth and transition-metal ions

This paper reviews studies on the optical properties of dielectric nanocrystals doped by rare-earth and transition-metal ions. Manifestations of small nanocrystal size in the optical properties of impurity ions are considered. Two types of phenomena are discussed: (i) those associated with modification of the vibrational spectrum of small particles and (ii) those due to the interaction of impurity ions with the medium in which they are embedded. (C) 2002 MAIK Nauka / Interperiodica.