Temperature-dependent segregation of Pr3+ impurity ions in Y2SiO5:Pr3+ and YPO4:Pr3+ nanocrystals |
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| Authors: | N V Znamenskii P O Maksimchuk Yu V Malyukin A A Masalov V V Semin’ko A Yu Shashkov |
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| Institution: | 19927. Kurchatov Institute Russian Research Center, pl. Kurchatova 1, Moscow, 123182, Russia
29927. Institute of Scintillation Materials, National Academy of Sciences of Ukraine, Kharkov, 61001, Ukraine
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| Abstract: | Stationary and time-resolved spectroscopic methods are used to show that the impurity ions in Y2SiO5:Pr3+ and YPO4:Pr3+ nanocrystals are distributed nonuniformly. This nonuniform distribution is found to be caused by the temperature-dependent segregation of Pr3+ ions near the surface of a nanocrystal. The motion of the activator ions from the bulk of a nanocrystal to the near-surface layer is traced when the activator concentration and the heat-treatment parameters are varied over wide ranges, and the main parameters of this effect (impurity redistribution intensity and time, diffusion coefficient) are estimated. |
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