Nanoparticles and quantum dots of wide band gap compounds activated with either transition metal (TM) or rare earth (RE) ions are perspective light emitting phosphors and fluorescence labels for applications in optoelectronics and biology and medicine. Unfortunately, intra-shell transitions of these ions are often inefficient, since are deactivated by parity and spin selection rules. In the consequence, intra-shell transitions of RE and TM ions are characterized by relatively long luminescence decay times and low efficiencies of radiative decay. This often limits possibilities of their applications as emission activators in modern light sources and as fluorescence labels.

In my talk I will discuss methods of stimulation of emission of intra-shell transitions of RE and TM ions. Concepts of co-doping, plasmonic mechanism of emission enhancement and idea of super radiance will be discussed based on the recent experimental results.