Abstract
Undoped and RE ions doped SrB 2Si 2O 8 were successfully synthesized. After the application of UV and VUV spectroscopy measurements, we made a novel discovery that the emission of SrB 2Si 2O 8:Eu prepared in air can be switched between red and blue by the different excitations. The information is that quite a part of Eu 3+ was spontaneously reduced to Eu 2+ in air. The PL properties of Eu 2+ in VUV and Eu 3+, Ce 3+ and Tb 3+ in UV–VUV region in SrB 2Si 2O 8 were evaluated for the first time. The excitation mechanisms of the O 2−–Eu 3+ CT, Ce 3+ f– d and Tb 3+ f–d transitions in UV region as well as the Eu 3+ f–d, O 2−–Ce 3+ CT, O 2−–Tb 3+ CT transitions and the host lattice absorption in VUV region were established. In addition, first principles calculation within the LDA of the DFT was applied to calculate the electronic structure and linear optical properties of SrB 2Si 2O 8 and the results were compared with the experimental data.
Published Version
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