Registration Number
0217U001270,
0115U000479
, R & D reports
Title
The mechanisms of scintillation processes in massive solids and thin film scintillation composites based on complex oxide compounds.
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Head
Grinyov Boris Viktorovich,
Registration Date
02-02-2017
Organization
Kharkov National University named after V.N. Karazin
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Objects of the research: crystals and nanocrystals of ReSi2O5 orthosilicates, ReAl2.07(B4O10)O0.6, ReAl3 (BO3)4 alumoborates, ReMgB5O10 borates and CeO2-x oxides. Objective of the research: to study the mechanisms of formation of optical and luminescent properties in scintillation materials based on oxide compounds. Methods of the research: the methods of optical and fluorescent spectroscopy, pico- and nanosecond time-resolved spectroscopy, luminescence microspectroscopy, scintillation spectrometry. As part of the project nanocrystals of ReSi2O5 orthosilicates, ReAl2.07(B4O10)O0.6, ReAl3 (BO3)4 alumoborates, ReMgB5O10 borates and CeO2-x oxides were obtained and the possibility of managing their scintillation and fluorescent characteristics by varying the stoichiometry of the nanocrystals and adding the impurity ions was investigated. It is shown that both the addition of ions with acceptor properties into the LuSi2O5:Ce3+ nanocrystals and the transition from crystals to nanocrystals lead to a significant reduction in the level of a material afterglow. It was found that in the cerium nanocrystals the capture of electrons of 4f0 subzone by oxygen vacancies leads to the formation F+- and F0- centers. The former ones form electron traps, and the latter ones demonstrate the presence of intrinsic luminescence. It is shown that the LaAlx(B4O10)Oy:Pr3+ crystals demonstrate the effect of quantum splitting at y = 0.6. It was found that at concentrations of Eu3+ of 20 at.% or more in LaMgBO10:Eu3+ nanocrystals the energy transfer takes place between the impurity ions that at concentrations close to 100 at.% becomes a one-dimensional migration.
Product Description
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І. Беспалова
Б. Гриньов
В. Богданов
В. Коршак
В. Семінько
О. Вягін
Ю. Бойко
Ю. Малюкін
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2020-04-02
