Relaxation of optical excitations in crystals of the Y2O3-Al2O3 system with radiation defects
M. A. MussaevaInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanA.A. GafarovInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanЭ. М. ИбрагимоваInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan
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Аннотация
The photoluminescence and short-time persistence (afterglow) kinetics in pure and doped Y2O3-Al2O3 crystals excited with UV laser pulses (12 ns, 337 nm) were studied using samples irradiated with gamma quanta from a 60Co source to a dose from 104 to 107 Gy. The relaxation time of the samples studied increases, with decreasing symmetry of the crystal lattice, in the following order: garnet—orthoaluminate—ruby—yttria. The afterglow duration and intensity significantly decrease in gamma-irradiated crystals, which is explained by the predominant recombination of close electron-hole pairs. Garnet-neodymium crystals are characterized by high radiation stability and fast relaxation kinetics.
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