Strong Infrared NLO Tellurides with Multifunction: CsXII4In5Te12 (XII = Mn, Zn, Cd)

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• 作者：Hua Lin ; Yi Liu ; Liu-Jiang Zhou ; Hua-Jun Zhao ; Ling Chen
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：May 2, 2016
• 年：2016
• 卷：55
• 期：9
• 页码：4470-4475
• 全文大小：528K
• 年卷期：0
• ISSN：1520-510X

文摘

Chalcogenides are the most promising mid- and far-infrared materials for nonlinear optical (NLO) applications. Yet, most of them are sulfides and selenides, and tellurides are still rare. Herein, we report three new KCd₄Ga₅S₁₂-structure type NLO-active tellurides, CsX^II₄In₅Te₁₂ (X^II = Mn, Zn, Cd), synthesized by solid-state reactions. The structure features a 3D diamond-like framework constructed by vertex-sharing asymmetric MTe₄ tetrahedra that are stacked along the c-axis. CsCd₄In₅Te₁₂ exhibits the strongest powder second-harmonic generation (SHG) intensity at 2050 nm (0.61 eV) among tellurides to date, 9 × benchmark AgGaS₂ in the range of 46–74 μm particle size. The primary studies reveal the 1.42 eV direct band gap and high absorption coefficient in the visible spectral region for CsCd₄In₅Te₁₂, suggesting it is a new potential solar cell absorber material. In addition, CsMn₄In₅Te₁₂ also displays a spin-canted antiferromagnetic property below 50 K.