A fast component, on the order 387 ns (300 K), has been detected in the decay kinetics of the yellow luminescence (563 nm) in LiF-UO₂ crystals. It is shown that the emitting centers are anisotropic formations oriented in the crystal lattice along the second-order symmetry axes (C₂) using the method of azimuthal dependence of the luminescence polarization. A model of the radiating centre is proposed and the position of the oxygen defect excited level is determined, from which the transition of an electron to the conduction band occurs. The luminescence (387 ns) from of the U⁵⁺ ion is observed as a result of electron transfer from oxygen ion to the excited U⁶⁺ level. The subsequent hole localization on U⁵⁺ in the ground state is accompanied by the reduction of the U⁶⁺ ion, that luminescence is observed in the green region of the spectrum (523 nm) with time decay 100 microsecond. Keyword: decay kinetics of luminescence, polarization, LiF-UO₂ crystals.

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