KCs2[Pb2Br5(HCOO)2]: A Polar 3D Lead‐Bromide Framework Exhibiting Strong Second‐Harmonic Generation Response. Issue 51 (29th July 2021)

• Record Type: Journal Article
• Authors: Zhou, Zi‐Qi; Shui, Qi‐Rui; Fu, Rui‐Biao; Fang, Yuan‐Bin; Ma, Zu‐Ju; Wu, Xin‐Tao
• Is Part Of: Chemistry. Volume 27:Issue 51(2021)
• Page Start: 12976
• Page End: 12980
• Publication Date: 2021-07-29
• Subjects: formate -- lead bromide -- noncentrosymmetric -- nonlinear optical crystals -- second harmonic generation; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202102332
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: The discovery of new nonlinear optical (NLO) crystals with excellent properties is in urgently demand because of their ability to generate coherent light. Herein, we report an unique NLO lead bromide formate, KCs2 [Pb2 Br5 (HCOO)2 ], which has been synthesized by a mix‐solvothermal method. KCs2 [Pb2 Br5 (HCOO)2 ] exhibits strong phase‐matching second‐harmonic generation (SHG) response (6.5×KDP), large birefringence (0.16@ 1064 nm), and a wide transparent window in most visible light and mid‐IR region. Interestingly, KCs2 [Pb2 Br5 (HCOO)2 ] features a polar 3D lead‐bromide framework in which adjacent Pb−Br layers containing coplanar Pb6 Br6 rings are not only parallel to each other, but also orient in the same direction. These oriented arrangements are responsible for the strong SHG response and large birefringence that are elucidated by both local dipole moment and theoretical calculations. This research provides a new strategy to explore subsequent NLO crystals. Abstract : KCs2 [Pb2 Br5 (HCOO)2 ] possessing strong second‐harmonic generation (SHG) response, large birefringence, and a wide transparent window in most visible light and mid‐IR region, has been obtained by the combination of [HCOO] groups and lead bromides. Interestingly, KCs2 [Pb2 Br5 (HCOO)2 ] features a polar 3D lead‐bromide framework in which adjacent Pb−Br layers containing coplanar Pb6 Br6 rings not only parallel to each other, but also orient in the same direction. These oriented arrangements are responsible for the strong SHG response and large birefringence that are elucidated by both local dipole moment and theoretical calculations.