[en] Spectral-kinetic characteristics of X-ray luminescence, parameters of thermostimulated luminescence are investigated and optical properties of radiative recombination centers and intermediate capture in isovalently activized crystals of zinc selenide are determined. It is shown that for scintillators on the basis of ZnSe-ZnTe compound dependning on stoichiometry (or the presence of other isovalent impurities) the intensity, spectral composition and luminescence kinetics can be largely determined by the presence of electron and hole traps with the depth of 0.13-0.75 eV; in other cases luminescence parameters mainly depend on the concentration and time of recharging of one type intrinsic defects in zinc selenide lattice, which play the role of radiative recombination centres. The role of tellurium as isovalent activator in the formation of specific optical properties of ZnSe:Te crystals is determined. 6 refs.1 tab