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Post-synthesis Treatment with Lead Bromide for Obtaining Near-Unity Photoluminescence Quantum Yield and Ultra-stable Amine-Free CsPbBr3 Perovskite Nanocrystals
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2022-06-23 , DOI: 10.1021/acs.jpcc.2c02379
Syed Akhil 1 , V. G. Vasavi Dutt 1 , Rahul Singh 1 , Nimai Mishra 1
Affiliation  

Improving the photoluminescence quantum yields (PLQYs) and optimizing the stability have been challenging tasks to promote cesium lead halide (CsPbX3; X = Cl, Br, and I) perovskite nanocrystals (PNCs) for real optoelectronic applications. In recent years, the amine-free synthesis route has become an option for making stable CsPbX3 PNCs. Further improvement in the PLQY and stability of amine-free PNCs is paramount for their practical applications. Herein, we have introduced a simple lead bromide (PbBr2) post-treatment process to achieve the near-unity PLQY (>95%) in amine-free CsPbBr3 PNCs. Furthermore, PbBr2 treatment enables these materials to have a drastically improved stability under different environmental conditions (polar solvents, light, and heat). In addition, a green-emitting down-converted light-emitting diode was fabricated using PbBr2-treated amine-free CsPbBr3 PNCs, which shows its considerable prospects for display applications. Thus, our results will promote these PbBr2-treated amine-free inorganic perovskite nanocrystals for commercial development in optoelectronic applications.

中文翻译:

用溴化铅进行合成后处理以获得近单位光致发光量子产率和超稳定的无胺 CsPbBr3 钙钛矿纳米晶体

提高光致发光量子产率 (PLQY) 和优化稳定性一直是促进铯铅卤化物 (CsPbX 3 ; X = Cl、Br 和 I) 钙钛矿纳米晶体 (PNC) 用于实际光电应用的具有挑战性的任务。近年来,无胺合成路线已成为制备稳定的CsPbX 3 PNCs的一种选择。进一步提高无胺 PNC 的 PLQY 和稳定性对其实际应用至关重要。在此,我们介绍了一种简单的溴化铅 (PbBr 2 ) 后处理工艺,以在无胺 CsPbBr 3 PNC 中实现接近统一的 PLQY (>95%) 。此外,PbBr 2处理使这些材料在不同的环境条件(极性溶剂、光和热)下具有显着提高的稳定性。此外,使用PbBr 2处理的无胺CsPbBr 3 PNCs制备了一种绿色发光的下转换发光二极管,显示出其在显示应用中的巨大前景。因此,我们的结果将促进这些经过 PbBr 2处理的无胺无机钙钛矿纳米晶体在光电应用中的商业开发。
更新日期:2022-06-23
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