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-xM xAl 1+xSi 1-xO 4:Eu 2+ and Na 1-xM xAlSiO 4-xN 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.
- aliovalent element substitution
- charge compensation
- phosphor for white LED