A Lead Mixed Halide with Three Different Coordinated Anions and Strong Second‐Harmonic Generation Response
Qirui Shui, Ruibiao Fu, Ziqi Zhou, Zuju Ma, Hong‐Xin Tang, Xin‐Tao Wu
Abstract
Abstract Nonlinear optical (NLO) crystals are widely applied in information technology, micro‐manufacturing and medical treatment. Herein, a new lead mixed halide with strong second‐harmonic generation (SHG) response, Cs 3 Pb 2 (CH 3 COO) 2 Br 3 I 2 , has been designed and rationally synthesized. Cs 3 Pb 2 (CH 3 COO) 2 Br 3 I 2 represents the rare NLO crystal featuring that three different anions (I − , Br − and O 2− ) simultaneously coordinate the Pb(II) atom to form a severely distorted [PbBr 2 I 2 O 2 ] polyhedron with a large polarizability. Remarkably, Cs 3 Pb 2 (CH 3 COO) 2 Br 3 I 2 not only exhibits a very strong phase‐matching SHG response of 9×KH 2 PO 4 (KDP), but also possesses a large birefringence (0.27@1064 nm) and high laser damage threshold (LDT). The strong SHG effect of Cs 3 Pb 2 (CH 3 COO) 2 Br 3 I 2 mainly originates from the oriented arrangement of [Pb 2 Br 3 I 2 ] chains. This study points out an effective strategy to develop new NLO crystals with strong SHG response.