Abstract
Zn2SiO4:Mn crystalline phosphor is a substitutional solid solution Zn2-2xMn2xSiO4, with х≤0.13. As the number of activator ions x > 0.13 grows, the mechanism of defect formation changes: some manganese ions change from doubly charged to triply charged, which is accompanied by the emergence of vacancies in the zinc sublattice. It is demonstrated that the coordination number of Mn3+ ions in the structure of willemite is five. The concentration quenching of Zn2SiO4:Mn is associated with the oxidation of a part of activator ions and dissipation of excitation energy on structural defects.
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