Photoluminescence of SrGdGa3O7:RE(RE=Ce^3+, Pr^3+ ,Tb^3+) under VUV-UV Excitation

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SrGdGa3O7:RE (RE=Ce3+, Pr3+, Tb3+) were prepared by traditional solid-state reaction and their luminescence properties in the range of VUV-Vis were investigated. The two broad bands situated at about 177 and 217 nm in excitation spectra are attributed to
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