AAg2PS4(A = K, Na/K): the first-type of noncentrosymmetric alkali metal Ag-based thiophosphates exhibiting excellent second-order nonlinear optical performances

The first-type of NCS alkali metal Ag-based thiophosphates KAg 2 PS 4 (1) and (Na 0.30 K 0.70 )Ag 2 PS 4 (2) exhibit large SHG responses, originating from the ordered arrangement of AgS 4 and PS 4 tetrahedra, and high LIDTs contributed by alkali metals.