Synthesis and luminescence properties of new nitridolithosilicate phosphor La 4 Ba 3 Li 3 Si 9 N 19 :Pr 3+ grown in Li flux.

Flux synthesis is an effective method to discover large crystals of new compounds. In this paper, a solid-state reaction in Li flux produced a new nitridolithosilicate La 4 Ba 3 Li 3 Si 9 N 19 in the orthorhombic space group Cmcm (No. 63) with lattice parameters of a = 9.7263(1), b = 18.2746(2), c = 11.2929(1) Å, and Z = 4. The La 4 Ba 3 Li 3 Si 9 N 19 exhibits a 3-D framework based on triangular clusters (3-rings) formed by vertex-sharing SiN 4 tetrahedra. The rare earth Pr 3+ -doped La 4 Ba 3 Li 3 Si 9 N 19 emits a narrow-band red emission peaking at approximately 640 nm with a full width at half-maximum of 50 nm when excited under ultraviolet light.