Li[LiCs2Cl][Ga3S6]: A Nanoporous Framework of GaS4 Tetrahedra with Excellent Nonlinear Optical Performance

A large nonlinear optical (NLO) coefficient and a wide band gap are two crucial but contradictory parameters that are difficult to achieve simultaneously in a single infrared (IR) NLO compound. A salt‐inclusion chalcogenide (SIC), Li[LiCs2Cl][Ga3S6] (1), was prepared that presents a nanosized tunnel...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2020-03, Vol.59 (12), p.4856-4859
Main Authors: Liu, Bin‐Wen, Jiang, Xiao‐Ming, Li, Bing‐Xuan, Zeng, Hui‐Yi, Guo, Guo‐Cong
Format: Article
Language:English
Subjects:
Chalcogenides
Energy gap
IR nonlinear optics
Nonlinear optics
porous structures
Second harmonic generation
Silver gallium sulfide
solid-state reactions
Tetrahedra
Tunnel construction
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Summary:A large nonlinear optical (NLO) coefficient and a wide band gap are two crucial but contradictory parameters that are difficult to achieve simultaneously in a single infrared (IR) NLO compound. A salt‐inclusion chalcogenide (SIC), Li[LiCs2Cl][Ga3S6] (1), was prepared that presents a nanosized tunnel framework constructed from monotype chalcogenide tetrahedra. Highly oriented covalent GaS4 tetrahedra in the host lead to a moderate second harmonic generation response (0.7 AgGaS2), and ionic guests effectively broaden the band gap to the widest value (4.18 eV) among all IR NLO chalcogenides, thereby achieving a remarkable balance between NLO efficiency and band gap. The salt‐inclusion chalcogenide Li[LiCs2Cl][Ga3S6] is presented, which features a 3D framework composed of [Ga3S6] nanosized tunnels. Introduction of an ionic guest to the covalent chalcogenide host produces a material with a moderate nonlinear optical (NLO) coefficient and an ultrawide band gap (Eg). These characteristics are promising for the development of infrared (IR) NLO materials.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201912416