Abstract:
The spectra of absorption and gamma luminescence and integral thermoluminescence curves (300–605 K) of nominally pure LuAG crystals and praseodymium-doped LuAG:Pr crystals have been analyzed before and after irradiation with fast ($>$ 0.1 MeV) neutrons in the range of fluences of 10$^{15}$–10$^{17}$ cm$^{-2}$. The optical spectra of LuAG:Pr, irradiated with neutrons with a fluence of 10$^{17}$ cm$^{-2}$, after thermal bleaching to 605 K and subsequent $\gamma$ irradiation and illumination in the induced band of 573 nm, indicate the electron transfer from the induced $V_{Î}(C_{\operatorname{imp}})$ center to the hole Pr$^{4+}$ center with radiation in Pr$^{3+}$. In the case of high-dose (for the LHC supercollider (HL–LHC)) neutron irradiation at $>$ 300 K, localization of electrons on the induced F$^+$ and $V_{Î}(C_{\operatorname{imp}})$ defects and localization of holes on the activator Pr$^{4+}$ centers decrease the intensity of high-speed (20 ns) activator luminescence and induces the occurrence of the long-term component in the recombination process.
Keywords:lutetium aluminum garnet, neutron induced defects, color centers, $\gamma$-luminescence, thermal glow and luminescence.
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