The Influence of Oxygen Vacancies on Luminescence Properties of Na₃LuSi₃O₉:Ce³⁺

Abstract

Oxygen vacancies play an important role in the luminescence processes of inorganic scintillator materials. In order to study the effects of oxygen vacancies on the luminescence properties of Na3LuSi3O9:Ce3+, these phosphors were prepared using a high temperature solid-state reaction method under different atmosphere and raw materials. It was found that oxygen vacancy had great influence on the absorption, photoluminescence and decay curves of Na3LuSi3O9:Ce3+. The luminescence intensity and peak position showed a regular change when synthesizing atmosphere changed. Na3LuSi3O9:Ce3+ with more oxygen vacancies showed much stronger luminescence intensity at high temperature than that without vacancies. And it was also found that the decreasing of oxygen vacancies can quicken the photoluminescence decay of Ce3+ in Na3LuSi3O9. The existence of oxygen vacancies in Na3LuSi3O9:Ce3+ was confirmed by Zr4+ doping and thermoluminescence emission spectra. At last, emission bands of Ce3+ and oxygen vacancies were well distinguished under X-ray excitation and probable cause of the formation of oxygen vacancies was discussed.

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“…All these spectra exhibit a similar tendency except the Sc/Mo 5:1; it clearly shows an extra intense absorption band centered at about 3.85 eV (322 nm), which is mainly caused by oxygen vacancies. In fact, similar phenomena have also been reported by Zhou et al where the absorption band is observed at 320 nm . Combining the experimental observation and the DFT calculation, we can conclude that the theoretical E gap value 3.56 eV corresponded to the experimental value of 3.69–4.16 eV, as it is generally accepted that the DFT calculation at LDA level has an underestimation.…”

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