Investigation of high-concentration doping performance based on Er³⁺-ion-doped Ba₆Gd₂Ti₄O₁₇

Recently, various strategies have been explored during research into the use of lanthanide-doped luminescent materials to mitigate energy loss at elevated dopant concentrations. Herein we report Yb³⁺/Er³⁺ co-doped Ba₆Gd₂Ti₄O₁₇ (BGTO) phosphors with a laminated lattice structure, which can allow the high-concentration doping of Er³⁺ ions into the oxide. Detailed investigations into the luminescence properties and crystal structures of Yb³⁺/Er³⁺ co-doped BGTO reveal that an increase in the dopant concentration is associated with the dimensional limitation of energy transfer in the crystal lattice. This finding may provide a novel avenue for the construction of high-dopant-concentration UC luminescent materials.