Efficient Lone-Pair-Driven Luminescence: Structure-Property Relationships in Emissive 5s2 Metal Halides.,ACS Materials Letters

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Efficient Lone-Pair-Driven Luminescence: Structure-Property Relationships in Emissive 5s2 Metal Halides.
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-08-04 , DOI: 10.1021/acsmaterialslett.0c00211
Kyle M McCall _{1,

2} , Viktoriia Morad _{1,

2} , Bogdan M Benin _{1,

2} , Maksym V Kovalenko _{1,

2}

Affiliation

Low-dimensional metal halides have been the focus of intense investigations in recent years following the success of hybrid lead halide perovskites as optoelectronic materials. In particular, the light emission of low-dimensional halides based on the 5s² cations Sn²⁺ and Sb³⁺ has found utility in a variety of applications complementary to those of the three-dimensional halide perovskites because of its unusual properties such as broadband character and highly temperature-dependent lifetime. These properties derive from the exceptional chemistry of the 5s² lone pair, but the terminology and explanations given for such emission vary widely, hampering efforts to build a cohesive understanding of these materials that would lead to the development of efficient optoelectronic devices. In this Perspective, we provide a structural overview of these materials with a focus on the dynamics driven by the stereoactivity of the 5s² lone pair to identify the structural features that enable strong emission. We unite the different theoretical models that have been able to explain the success of these bright 5s² emission centers into a cohesive framework, which is then applied to the array of compounds recently developed by our group and other researchers, demonstrating its utility and generating a holistic picture of the field from the point of view of a materials chemist. We highlight those state-of-the-art materials and applications that demonstrate the unique capabilities of these versatile emissive centers and identify promising future directions in the field of low-dimensional 5s² metal halides.

中文翻译：

高效孤对电子驱动发光：发射 5s2 金属卤化物中的结构-性能关系。

近年来，随着杂化卤化铅钙钛矿作为光电材料的成功，低维金属卤化物一直是深入研究的焦点。特别是，基于 5s ²阳离子 Sn ²⁺和 Sb ³⁺的低维卤化物的光发射由于其宽带等不寻常的特性而在与三维卤化物钙钛矿互补的各种应用中得到了应用。特性和高度依赖温度的寿命。这些特性源自 5s ²孤对电子的特殊化学性质，但针对此类发射给出的术语和解释差异很大，阻碍了对这些材料建立统一理解的努力，而这将导致高效光电器件的开发。在本视角中，我们提供了这些材料的结构概述，重点关注 5s ²孤对电子立体活性驱动的动力学，以确定实现强发射的结构特征。我们将能够解释这些明亮的 5s ²发射中心成功的不同理论模型统一到一个有凝聚力的框架中，然后将其应用于我们小组和其他研究人员最近开发的一系列化合物，展示其实用性并生成从材料化学家的角度对该领域的整体了解。我们重点介绍那些最先进的材料和应用，它们展示了这些多功能发射中心的独特功能，并确定了低维 5s ²金属卤化物领域有前途的未来方向。

更新日期：2020-09-08

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