K3Sb2(HPO4)2(PO4)F2: Excellent UV Phosphite Birefringent Material with One-Dimensional Chain Structure

Author of the article:LIU Yuxi, ZOU Guohong

Author's Workplace：College of Chemistry, Sichuan University, Chengdu 610065, China

Key Words：crystal structure; birefringence material; second harmonic generation effect; one-dimensional chain; lone pair electron; phosphate

Abstract：Birefringent materials with the ability to modulate polarized light, play an important role in the manufacture of polarization devices. Several commercial birefringent materials cannot be widely used due to their inherent defects such as narrow light transmission area, low birefringence index and poor crystal quality. Therefore, the design and synthesis of birefringent materials with good performance is still an important topic in the current research of optical materials. A case of the birefringent material K3Sb2(HPO4)2(PO4)F2 prepared by the ionothermal synthesis method is reported in this paper. It has a unique one-dimensional chain structure with a short UV cut-off edge (272 nm), large birefringence (0.11@546 nm), moderate second harmonic generation (SHG) effect (0.1×KDP) and good thermal stability, which means that the compound is a promising UV optical material.