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The spectroscopic properties of Ce 3+ , Pr 3+ and Tb 3+ activated SrB 4 O 7 in VUV–vis range were investigated. The split 5d levels for Ce 3+ in the host lattice are discussed and an environmental factor F c is used to explain the crystal field splitting (CFS). The photon cascade emission (PCE) process was observed in Pr 3+ doped SrB...
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