  We consider emitting nanoparticles in dielectric nanocomposites with varying
refractive index contrast and geometry. For that we develop a simple and
universal method to calculate the emission enhancement in nanocomposites that
employs solely the calculation of the effective refractive index and electric
field distributions from three quasistatic calculations with orthogonal
polarizations. The method is exemplified for dilute nanocomposites without
electromagnetic interaction between emitting particles as well as for dense
nanocomposites with strong particle interaction. We show that the radiative
decay in dielectric nanocomposites is greatly affected by the shape and
arrangement of its constituents and give guidelines for larger enhancement.
