Luminescence and energy transfer of Ce and Tb in Y3Si2O8Cl

The luminescence properties of Ce³⁺ and Tb³⁺ in Y₃Si₂O₈Cl have been investigated. The Ce³⁺ excitation bands in the region from 220 to are attributed to the transitions from 4f level to the crystal-field splitting levels of 5d. The Tb³⁺ excitation bands in the region from 220 to are due to the 4f-5d transitions. The spectral energy distributions of Tb³⁺ emission strongly depend on the Tb³⁺ concentration, the emissions of Tb³⁺ decrease with increasing Tb³⁺ concentration, this phenomenon is due to the cross-relaxation between Tb³⁺ ions. The efficient energy transfer from Ce³⁺ to Tb³⁺ in the Y₃Si₂O₈Cl is observed and discussed.