Issue 32, 2019

A2Bi2(SO4)2Cl4 (A = NH4, K, Rb): achieving a subtle balance of the large second harmonic generation effect and sufficient birefringence in sulfate nonlinear optical materials

Abstract

[SO4]2−, a tetrahedral anionic group similar to [PO4]3−, possesses small microscopic second order polarizability and polarizability anisotropy, which tends to result in a weak second harmonic generation effect and small birefringence. Here, three non-centrosymmetric A2Bi2(SO4)2Cl4 (A = NH4, K, Rb) compounds were obtained by an evaporation solution method, which exhibit strong SHG effects of about 4.8, 5.5, and 5.3 × KDP, as well as a large birefringence of 0.055, 0.056 and 0.047 at 1064 nm, respectively. The three compounds exhibit the largest SHG effects among the reported sulfate NLO materials. The first-principles calculations elucidated that the large SHG effects and birefringence were mainly attributed to the synergistic effect of the BiO5Cl2 and [SO4]2− groups. This work may give feasible guidance for the subsequent exploration of sulfate NLO crystals with a large SHG effect and birefringence.

Graphical abstract: A2Bi2(SO4)2Cl4 (A = NH4, K, Rb): achieving a subtle balance of the large second harmonic generation effect and sufficient birefringence in sulfate nonlinear optical materials

Supplementary files

Article information

Article type
Paper
Submitted
10 Jun 2019
Accepted
10 Jul 2019
First published
11 Jul 2019

J. Mater. Chem. C, 2019,7, 9900-9907

A2Bi2(SO4)2Cl4 (A = NH4, K, Rb): achieving a subtle balance of the large second harmonic generation effect and sufficient birefringence in sulfate nonlinear optical materials

K. Chen, Y. Yang, G. Peng, S. Yang, T. Yan, H. Fan, Z. Lin and N. Ye, J. Mater. Chem. C, 2019, 7, 9900 DOI: 10.1039/C9TC03105G

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