Amino Acid-Mediated Synthesis of CsPbBr3 Perovskite Nanoplatelets with Tunable Thickness and Optical Properties,Chemistry of Materials

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Amino Acid-Mediated Synthesis of CsPbBr3 Perovskite Nanoplatelets with Tunable Thickness and Optical Properties
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-09-13 00:00:00 , DOI: 10.1021/acs.chemmater.8b02396
Jinyuan Zhao ₁ , Sunan Cao ₁ , Zhi Li ₁ , Nan Ma ₁

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Metal halide perovskites (MHPs) have recently attracted considerable attentions due to their remarkable optoelectronic properties. Colloidal synthesis of MHPs provides a versatile route to precisely control their dimensionality and the related optoelectronic properties. Herein, we report on amino acid (Trp)-mediated synthesis of quasi-two-dimensional CsPbBr₃ perovskite nanoplatelets (NPLs) with well-controlled and tunable thickness. The number of layers (n) could be finely tuned from 4 to 12 by simply adjusting Trp concentration, leading to gradual red shift of their photoluminescence (PL). This allows us to directly correlate their thickness with the band gap energy in the quantum confinement regime, which is in good agreement with theoretical model. We found that Trp is the only hydrophobic amino acid to promote the formation of 2D CsPbBr₃ NPLs. The use of Trp derivatives for CsPbBr₃ nanocrystal synthesis indicates that the carboxyl group, amine group, and indole ring of Trp act synergistically on CsPbBr₃ NPL formation.

中文翻译：

氨基酸介导的具有可调厚度和光学性质的CsPbBr ₃钙钛矿纳米片的合成

金属卤化物钙钛矿（MHPs）由于其卓越的光电性能，最近引起了相当大的关注。MHP的胶体合成提供了一条精确控制其尺寸和相关光电特性的通用途径。在本文中，我们报道了氨基酸（Trp）介导的准二维CsPbBr ₃钙钛矿纳米片（NPLs）的合成，其厚度可控且可调节。层数（n只需调整Trp浓度即可将）从4微调到12，从而导致其光致发光（PL）逐渐红移。这使我们能够直接将它们的厚度与量子约束机制中的带隙能量相关联，这与理论模型非常吻合。我们发现，Trp是促进2D CsPbBr ₃ NPL形成的唯一疏水性氨基酸。Trp衍生物用于CsPbBr ₃纳米晶体的合成表明Trp的羧基，胺基和吲哚环协同作用于CsPbBr ₃ NPL的形成。

更新日期：2018-09-13

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