Control of NaAlSiO4:Eu2+ 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 NaAlSiO4:Eu2+ 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 Na1- xMxAl1+xSi1-xO4: Eu2+ and Na(1-x)M(x)AlSiO(4-x)Nx:Eu2+(M = Mg2+, Ca2+, and Sr2+), 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.