ИСТИНА

The study of the STEs interaction in ZnMoO4 and CaMoO4 single crystals is performed. Non-linear quenching of luminescence starts for concentration of excitations above 3*1020 for CaMoO4 and 2.5*1021 cm-3 for ZnMoO4. A prominent increase of the fast initial part of decay curve was detected with the increase of the excitation density. The numerical simulation of the measured decay and z-scan curves was performed with account for 3D nonuniform distribution of the initial concentration of excitations. The dipole-dipole interaction radii Rd-d are calculated using the model which accounts for STEs diffusion and exciton thermal quenching.