Structure, Anion Order, and Ce3+ Luminescence of the Y4Al2O9-Y4Si2O7N2 Solid Solutions
Oxonitridoalumosilicates Y4Al2-2xSi2xO9-2xN2x (0.00 ≤ x ≤ 1.00) were prepared and the substitution effect of [Al3+O2-] pairs by [Si4+N3-] pairs in the Y4Al2O9-Y4Si2O7N2 solid solutions on the structure and its corresponding influence of Ce3+ activated luminescence properties are investigated. Y4Al2-2xSi2xO9-2xN2x (0.00 ≤ x ≤ 1.00) shows two solid solution regions, x = 0.00 ~ 0.40 for solid solution I, x = 0.50 ~ 1.00 for solid solution II from X-ray and neutron diffractions analysis. In the solid solution I, the Ce3+ emission is mainly in UV range with the maximum wavelength at 350 nm, and the intensity decreases rapidly with the increase of the N content. In the solid solution II, the Ce3+ doped samples show blue-green luminescence with the maximum wavelength at ~450 nm and the wide excitation bands extend from UV to 450 nm. The phosphors in the solid solution II are promising candidates for white-LED applications.