文摘
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 Na<sub>3sub>LuSi<sub>3sub>O<sub>9sub>:Ce<sup>3+sup>, 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 Na<sub>3sub>LuSi<sub>3sub>O<sub>9sub>:Ce<sup>3+sup>. The luminescence intensity and peak position showed a regular change when synthesizing atmosphere changed. Na<sub>3sub>LuSi<sub>3sub>O<sub>9sub>:Ce<sup>3+sup> 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 Ce<sup>3+sup> in Na<sub>3sub>LuSi<sub>3sub>O<sub>9sub>. The existence of oxygen vacancies in Na<sub>3sub>LuSi<sub>3sub>O<sub>9sub>:Ce<sup>3+sup> was confirmed by Zr<sup>4+sup> doping and thermoluminescence emission spectra. At last, emission bands of Ce<sup>3+sup> and oxygen vacancies were well distinguished under X-ray excitation and probable cause of the formation of oxygen vacancies was discussed.