Control of NaAlSiO ₄ :Eu ²⁺ photoluminescence properties by charge-compensated aliovalent element substitutions

We have conducted two kinds of the so-called charge-compensated aliovalent element substitutions to control the photoluminescence properties of NaAlSiO 4:Eu 2+ with a special focus on the enhancement of the excitation intensity at 400 nm. The aliovalent element substitutions include cation–cation and cation–anion co-substitutions according to the general formulas Na 1−x M x Al 1+x Si 1−x O 4:Eu 2+ and Na 1−x M x AlSiO 4−x N x :Eu 2+ (M=Mg 2+, Ca 2+, and Sr 2+), respectively. The increase in the relative excitation intensity at 400 nm has been achieved in both types of the co-substitutions. Thus, the present research has demonstrated the effectiveness of the charge-compensated element substitution.