Narrow-Band Red Emitting Oxonitridosilicate Phosphor La4-Xsr2+Xsi5n12-Xox:Pr3+ (X Approximate To 1.69)

The new oxonitridosilicates Ln(4-x)Sr(2+x)Si(5)N(12-x)O(x) (Ln = La, Ce) were synthesized by high temperature solid-state reactions. The crystal structures were solved and refined from both single-crystal and powder X-ray diffraction data. These oxonitridosilicate compounds crystallize in the monoclinic space group P2(1)/n (no. 14) and exhibit a double-layer structure made up of corner-sharing Si(O/N)(4) tetrahedra. When excited with near-UV and blue light, the Pr3+ doped La2.31Sr3.69Si5N10.31O1.69 phosphor shows a narrow-band red emission peaking at 625 nm with a full width at half-maximum of 40 nm.