Applying band gap engineering to tune the linear optical and nonlinear optical properties of noncentrosymmetric chalcogenides La4Ge3SexS12−x (x = 0, 2, 4, 6, 8, 10)

Band gap engineering was applied to tune the properties of a phase-matchable La 4 Ge 3 S 12 by replacing S with Se, which uncovered five new compounds: La 4 Ge 3 Se x S 12− x ( x = 2, 4, 6, 8, 10).