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Single‐Solvent, Ligand‐Free, Gram‐Scale Synthesis of Cs4PbBr6 Perovskite Solids with Robust Green Photoluminescence
ChemNanoMat ( IF 2.6 ) Pub Date : 2019-12-20 , DOI: 10.1002/cnma.201900604
Yunwei Wei 1 , Ruijia Sun 2 , Yuehua Li 1 , Yuhai Zhang 2 , Yizhong Lu 3 , Xiaoming Li 4 , Guozhu Chen 1 , Bingqiang Cao 3 , Cuncheng Li 1 , Haibo Zeng 4
Affiliation  

The preparation of luminescent Cs4PbBr6 perovskite solids with current methods either needs a complex procedure, or needs a variety of ligands, and a combination of good solvents and anti‐solvents. The potential environmental risks are inevitable when they are produced in large scale. Herein, an environmentally friendly route for the mass production of luminescent Cs4PbBr6 perovskite solids using a single solvent under ambient conditions is presented. Gram‐scale Cs4PbBr6 perovskite solids are produced within tens of minutes using a small amount of DMF, specifically, 4 mL DMF solution can produce over 10 g products per batch. Because no ligands and anti‐solvents are utilized in the whole procedures, the ligand‐free Cs4PbBr6 perovskite solids are facilely harvested after the evaporation of solvent. More importantly, the solvent vapor can be recovered and reutilized, which can eliminate the environmental pollution caused by organic solvent. The experimental results revealed that the solvent, reaction time, and PbBr2/CsBr molar ratios are crucial for the formation of Cs4PbBr6 perovskite solids and their luminescent performances. Such Cs4PbBr6 perovskite solids exhibit strong green PL emission, high PL quantum yield and reversible fluorescent response towards heat and light, which enable them to be suitable for applications in optoelectronic devices.

中文翻译:

具有稳健的绿色光致发光的Cs4PbBr6钙钛矿固体的单溶剂,无配体,克级合成

当前方法制备发光的Cs 4 PbBr 6钙钛矿固体需要复杂的程序,或者需要各种配体,以及良好的溶剂和抗溶剂的组合。大规模生产潜在的环境风险是不可避免的。在此,提出了一种在环境条件下使用单一溶剂大规模生产发光Cs 4 PbBr 6钙钛矿固体的环保途径。克级Cs 4 PbBr 6使用少量DMF可以在几十分钟内生产钙钛矿固体,特别是4 mL DMF溶液每批可以生产10 g以上的产品。由于在整个过程中均未使用任何配体和抗溶剂,因此在蒸发溶剂后可以轻松收集不含配体的Cs 4 PbBr 6钙钛矿固体。更重要的是,溶剂蒸气可以回收利用,可以消除有机溶剂对环境的污染。实验结果表明,溶剂,反应时间和PbBr 2 / CsBr摩尔比对Cs 4 PbBr 6钙钛矿固体的形成及其发光性能至关重要。此类Cs 4 PbBr6种钙钛矿固体具有很强的绿色PL发射,高PL量子产率以及对热和光的可逆荧光响应,这使其适合用于光电器件。
更新日期:2019-12-20
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