Hybrid lead halide perovskites continue to attract interest for use in optoelectronic devices such as solar cells and light-emitting diodes. Although challenging, the replacement of toxic lead in these systems is an active field of research. Recently, the use of trivalent metal cations (Bi³⁺ and Sb³⁺) that form defect perovskites A₃B₂X₉ has received great attention for the development of solar cells, but their light-emissive properties have not previously been studied. Herein, an all-inorganic antimony-based two-dimensional perovskite, Cs₃Sb₂I₉, was synthesized using the solution process. Vapor–anion-exchange method was employed to change the structural composition from Cs₃Sb₂I₉ to Cs₃Sb₂Br₉ or Cs₃Sb₂Cl₉ by treating CsI/SbI₃ spin-coated films with SbBr₃ or SbCl₃, respectively. This novel method facilitates the fabrication of Cs₃Sb₂Br₉ or Cs₃Sb₂Cl₉ through solution processing without the need of using poorly soluble precursors (e.g., CsCl and CsBr). We go on to demonstrate electroluminescence from a device employing Cs₃Sb₂I₉ emitter sandwiched between ITO/PEDOT:PSS and TPBi/LiF/Al as the hole and electron injection electrodes, respectively. A visible–infrared radiance of 0.012 W·Sr^–1·m^–2 was measured at 6 V when Cs₃Sb₂I₉ was the active emitter layer. These proof-of-principle devices suggest a viable path toward low-dimensional, lead-free A₃B₂X₉ perovskite optoelectronics.

中文翻译：

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通过蒸气-阴离子交换法的无铅锑基发光二极管

混合卤化铅钙钛矿继续引起人们的兴趣，将其用于光电子器件，例如太阳能电池和发光二极管。尽管具有挑战性，但在这些系统中替换有毒铅是一个活跃的研究领域。近来，形成缺陷钙钛矿A ₃ B ₂ X ₉的三价金属阳离子（Bi ³⁺和Sb ³⁺）的使用已受到太阳能电池开发的极大关注，但是它们的发光性质以前没有被研究过。本文中，基于全无机锑的二维钙钛矿Cs ₃ Sb ₂ I ₉，是使用溶液法合成的。通过用SbBr ₃或SbCl ₃处理旋涂的CsI / SbI ₃薄膜，采用气相-阴离子交换法将结构组成从Cs ₃ Sb ₂ I ₉变为Cs ₃ Sb ₂ Br ₉或Cs ₃ Sb ₂ Cl ₉。， 分别。这种新颖的方法有助于Cs ₃ Sb ₂ Br ₉或Cs ₃ Sb ₂ Cl _9的制造通过溶液处理无需使用难溶的前体（例如CsCl和CsBr）。我们继续展示了使用Cs ₃ Sb ₂ I ₉发射极夹在ITO / PEDOT：PSS和TPBi / LiF / Al之间作为空穴和电子注入电极的器件的电致发光。当Cs ₃ Sb ₂ I ₉为有源发射极层时，在6 V下测得的可见红外辐射为0.012 W·Sr ^–1 ·m ^–2。这些原理证明装置为实现低尺寸，无铅的A ₃ B ₂ X ₉钙钛矿光电技术提供了一条可行的途径。