Rational Design of the Alkali Metal Sn‐Based Mixed Halides with Large Birefringence and Wide Transparent Range

Birefringent materials are widely used in various advanced optical systems, owing to their vital role in creating and controlling polarized light. Currently, Sn2+‐based compounds containing stereochemically active lone‐pair (SCALP) cations are extensively investigated and considered as one class of...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-04, Vol.20 (17), p.e2308884-n/a
Main Authors: Wang, Junbo, Zhu, Mengmeng, Chu, Yaoqing, Tian, Jindan, Liu, Lili, Zhang, Bingbing, Halasyamani, P. Shiv
Format: Article
Language:English
Subjects:
Alkali metal compounds
Birefringence
birefringent materials
Cesium
Energy gap
Halides
Halogens
mixed halogen ions
optical anisotropy
Optical properties
Polarized light
Rubidium
SCALP cations
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Summary:Birefringent materials are widely used in various advanced optical systems, owing to their vital role in creating and controlling polarized light. Currently, Sn2+‐based compounds containing stereochemically active lone‐pair (SCALP) cations are extensively investigated and considered as one class of promising birefringent materials. To solve the problem of relatively narrow bandgap of Sn2+‐based compounds, alkali metals and multiple halogens are introduced to widen the bandgap during the research. Based on this strategy, four new Sn2+‐based halides, A2Sn2F5Cl and ASnFCl2 (A = Rb and Cs), with large birefringence, short ultraviolet (UV) cutoff edge, and wide transparent range are successfully found. The birefringences of A2Sn2F5Cl (A = Rb and Cs) are 0.31 and 0.28 at 532 nm, respectively, which are among the largest in Sn‐based halide family. Remarkably, A2Sn2F5Cl possess relatively shorter UV cutoff edge (
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202308884