A2Bi2(SeO3)3F2 (A = K and Rb): Excellent Mid-infrared Nonlinear Optical Materials with both Strong SHG Responses and Large Band Gaps

A family of noncentrosymmetric alkali metal bismuth selenite fluorides, A2Bi2(SeO3)3F2 (A = K(1) and Rb(2)), had been synthesized through mild hydrothermal method. These isostructural compounds all...