Synthesis and luminescent properties of novel Ca₃Y₃Ge₂BO₁₃:Ln³⁺ (Ln³⁺ = Tb³⁺ and Eu³⁺) phosphors

Novel Ln³⁺-doped (Ln³⁺ = Tb³⁺ and Eu³⁺) and Eu³⁺, Bi³⁺ co-doped Ca₃Y₃Ge₂BO₁₃ phosphors were synthesized by a conventional solid-state reaction method. Tb³⁺- and Eu³⁺-doped phosphors showed strong narrow green and red emission due to 4f intra-shell transitions of the Tb³⁺ or Eu³⁺ ions under the excitation at 254 nm. Bi³⁺ co-doped Ca₃Y₃Ge₂BO₁₃:Eu³⁺ phosphor has a new broad strong excitation band appeared at around 302 nm due to ¹S₀→³P₁ transition of Bi³⁺, and presents red emission owing to 4f-4f transition of Eu³⁺ under excitation at 302 nm.