β-Pb_(3)P_(2)S_(8):A new optical crystal with exceptional birefringence effect  

作　　者：Weiping Guo Ying Zhu Hong-Hua Cui Lingyun Li Yan Yu Zhong-Zhen Luo Zhigang Zou 

机构地区：[1]Key Laboratory of Eco-materials Advanced Technology,Key Laboratory of Advanced Materials Technologies International(HongKong Macao and Taiwan)Joint Laboratory on Advanced Materials Technologies,College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China [2]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China [3]Mechanical and Electrical Engineering Practice Center,Fuzhou University,Fuzhou 350108,China [4]Eco-materials and Renewable Energy Research Center,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Chemical Letters》2025年第2期486-489,共4页中国化学快报(英文版)

基　　金：supported in part by the National Natural Science Foundation of China(No.52102218);the National Key Research and Development Program of China(No.2020YFA0710303);the Fujian Science&Technology Innovation Laboratory for Op-toelectronic Information of China(No.2021ZZ127);the Minjiang Scholar Professorship(No.GXRC-21004);the Natural Science Foundation of Fujian Province of China(No.2021J01594)。

摘　　要：Birefringent crystals play an irreplaceable role in optical systems by adjusting the polarization state of light in optical devices.This work successfully synthesized a new thiophosphate phase ofβ-Pb_(3)P_(2)S_(8)through the high-temperature solid-state spontaneous crystallization method.Different from the cubicα-Pb_(3)P_(2)S_(8),theβ-Pb_(3)P_(2)S_(8)crystallizes in the orthorhombic Pbcn space group.Notably,β-Pb_(3)P_(2)S_(8)shows a large band gap of 2.37 e V in lead-based chalcogenides,wide infrared transparent window(2.5-15μm),and excellent thermal stability.Importantly,the experimental birefringence shows the largest value of0.26@550 nm in chalcogenides,even larger than the commercialized oxide materials.The Barder charge analysis result indicates that the exceptional birefringence effect is mainly from the Pb^(2+)and S^(2-)in the[Pb S_n]polyhedrons.Meanwhile,the parallelly arranged polyhedral layers could improve the structural anisotropic.Therefore,this work supports a new method for designing chalcogenides with exceptional birefringence effect in the infrared region.

关 键 词：Birefringent crystals Optical properties CHALCOGENIDES β-Pb3P2S8 Structural anisotropic 

分 类 号：O734[理学—晶体学]