Lead-Free Perovskite Variant Solid Solutions Cs2 Sn1- x Tex Cl6 : Bright Luminescence and High Anti-Water Stability.,Advanced Materials

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Lead-Free Perovskite Variant Solid Solutions Cs2 Sn1- x Tex Cl6 : Bright Luminescence and High Anti-Water Stability.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-06-28 , DOI: 10.1002/adma.202002443
Zhifang Tan _{1,

2} , Yanmeng Chu ₁ , Jinxi Chen _{1,

2} , Jinghui Li ₁ , Guoqi Ji ₁ , Guangda Niu ₁ , Liang Gao ₁ , Zewen Xiao ₁ , Jiang Tang _{1,

2}

Affiliation

Underwater lighting is important for the exploration of the underwater world in different areas. It is of great significance for developing underwater emitters with high penetrability, high luminous efficiency, good anti‐water stability, and environmental friendliness. Stable lead‐free perovskite luminescent materials, represented by vacancy‐ordered double perovskites, are worthy of research because they can almost meet the above requirements. Here, lead‐free perovskite variant solid solutions with the formula of Cs₂Sn₁₋_x Te_x Cl₆ are reported. Upon the exchange of Sn/Te ions, strong Jahn–Teller distortion of octahedra occurs in the lattice structure. The combination of Te luminescent center and Jahn–Teller‐like self‐trapped excitons gives this material yellow‐green luminescence with a wavelength of 580 nm and a high photoluminescence quantum yield of 95.4%. Moreover, these solid solutions can withstand the extreme conditions of immersion in water probably due to the formation of amorphous alteration phase. Such good anti‐water stability is also supported by the molecule dynamics simulation result that no reaction occurs on the water/Cs₂SnCl₆ interface. The high luminous, suitable wavelength, and good anti‐water stability enable the solid solutions suitable for the application for underwater lighting.

中文翻译：

无铅钙钛矿变体固溶体Cs2 Sn1- x Tex Cl6：发光明亮，抗水稳定性高。

水下照明对于探索不同地区的水下世界非常重要。这对于开发具有高渗透性，高发光效率，良好的抗水稳定性和环境友好性的水下发射器具有重要意义。以空位有序双钙钛矿为代表的稳定的无铅钙钛矿发光材料值得研究，因为它们几乎可以满足上述要求。在这里，化学式为Cs ₂ Sn ₁₋_x Te _x Cl ₆的无铅钙钛矿变体固溶体被报道。交换Sn / Te离子后，八面体的强Jahn-Teller畸变发生在晶格结构中。Te发光中心和Jahn-Teller样自陷激子的结合使该材料发出黄绿色发光，波长为580 nm，并且高光致发光量子产率为95.4％。而且，这些固溶体可以承受浸入水中的极端条件，这可能是由于形成了非晶相变相。分子动力学模拟结果也证明了这种良好的抗水稳定性，在水/ Cs ₂ SnCl ₆界面上没有反应发生。高发光，合适的波长和良好的抗水稳定性使固体溶液适合水下照明应用。

更新日期：2020-08-11

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