Effect of Mn2+doping and DDAB-assisted postpassivation on the structural and optical properties of CsPb(Cl/Br)3halide perovskite nanocrystals.

IF 2.4 3区 化学 Q3 CHEMISTRY, ANALYTICAL
Charu Dubey, Anjana Yadav, Santosh Kachhap, Sunil Kumar Singh, Govind Gupta, Satendra Pal Singh, Akhilesh Kumar Singh
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Abstract

Cesium lead halide perovskite (CsPbX3; X = Cl, Br, I) nanocrystals showing intense band-edge emission and high photoluminescence quantum yield are known to be a potential candidate for application in optoelectronic devices. However, controlling toxicity due to the presence of Pb2+in lead-based halide perovskites is a major challenge for the environment that needs to be tackled cautiously. In this work, we have partially replaced Pb2+with Mn2+ions in the CsPb(Cl/Br)3nanocrystals and investigated their impact on the structural and optical properties. The Rietveld refinement shows that CsPbCl2Br nanocrystals possess a cubic crystal structure withPmmspace group, the Mn2+doping results in the contraction of the unit cell. The CsPb(Cl/Br)3: Mn nanocrystals show a substantial change in the optical properties with an additional emission band at ∼588 nm through a d-d transition, changing the emission color from blue to pink. Here, a didodecyldimethylammonium bromide (DDAB) ligand that triggers both anion and ligand exchange in the CsPb(Cl/Br)3: Mn nanocrystals have been used to regulate the exchange reaction and tune the emission color of halide perovskites by changing the peak position and the PL intensities of band-edge and Mn2+defect states. We have also shown that oleic acid helps in the desorption of oleylamine capping from the CsPb(Cl/Br)3: Mn nanocrystal surfaces and DDAB, resulting in the substitution of Cl-with Br-as well as provides capping with shorter branched length ligand which led to increase in the overall PL intensity by many folds.

掺杂 Mn2+ 和 DDAB 辅助后钝化对 CsPb(Cl/Br)3 卤化物包晶石纳米晶体的结构和光学特性的影响。
众所周知,卤化铯铅包晶(CsPbX3;X = Cl、Br、I)纳米晶体显示出强烈的带边发射和高光致发光量子产率,是光电器件应用的潜在候选材料。然而,由于铅基卤化物包晶石中存在 Pb2+ 而导致的毒性控制是对环境的一大挑战,需要谨慎应对。在这项工作中,我们用 Mn2+ 离子部分取代了 CsPb(Cl/Br)3 纳米晶体中的 Pb2+,并研究了它们对结构和光学特性的影响。里特维尔德精炼结果表明,CsPbCl2Br 纳米晶体具有 Pm3 ̅m 空间群的立方晶体结构,Mn2+的掺杂导致了单胞的收缩。CsPb(Cl/Br)3:Mn 纳米晶体的光学性质发生了重大变化,通过 d-d 转变在 ~588 纳米处增加了一个发射带,使发射颜色从蓝色变为粉红色。在此,我们使用了十二烷基二甲基溴化铵(DDAB)配体,这种配体可同时引发 CsPb(Cl/Br)3:Mn 纳米晶体中的阴离子和配体交换,通过改变带边态和 Mn2+ 缺陷态的峰位置和聚光强度来调节交换反应并调整卤化物包晶的发射颜色。我们还发现,油酸有助于解吸 CsPb(Cl/Br)3:Mn 纳米晶表面和 DDAB 上的油胺封端,从而用 Br'取代 Cl',并提供支链长度更短的配体封端,从而使整体聚光强度增加了许多倍。
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来源期刊
Methods and Applications in Fluorescence
Methods and Applications in Fluorescence CHEMISTRY, ANALYTICALCHEMISTRY, PHYSICAL&n-CHEMISTRY, PHYSICAL
CiteScore
6.20
自引率
3.10%
发文量
60
期刊介绍: Methods and Applications in Fluorescence focuses on new developments in fluorescence spectroscopy, imaging, microscopy, fluorescent probes, labels and (nano)materials. It will feature both methods and advanced (bio)applications and accepts original research articles, reviews and technical notes.
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