Luminescent Properties of Activated Nanocomposites Based on Core-Shell Nanoparticles

Formulas for the rates of spontaneous radiative decay of excitation of luminescent centers located in subwavelength spherical core-shell nanoparticles and in the nanocomposite matrix are derived. Effective medium models and local field problems concerning the optical properties of activated nanocomposites based on core-shell nanoparticles are discussed. A detailed analysis of two modern approaches to the problem of spontaneous transitions in luminescent centers located in homogeneous spherical nanoparticles is made.