Electronic structure and site occupancy of lanthanide-doped (Sr, ca)₃(Y, lu)₂Ge₃O₁₂ garnets: A spectroscopic and first-principles study

Photoluminescence excitation (PLE) and emission spectra (PL) of undoped (Sr, Ca)₃(Y, Lu)₂Ge₃O₁₂ as well as Eu³⁺- and Ce³⁺-doped samples have been investigated. The PL spectra show that Eu³⁺ enters into both dodecahedral (Ca, Sr) and octahedral (Y, Lu) sites. Ce<sup>3...