Using chiral ammonium cations to modulate the structure of 1D hybrid lead bromide perovskites for linearly polarized broadband light emission at room temperature,Journal of Materials Chemistry C

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Using chiral ammonium cations to modulate the structure of 1D hybrid lead bromide perovskites for linearly polarized broadband light emission at room temperature
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2022-08-09 , DOI: 10.1039/d2tc02040h
Joanna M. Urban ₁ , Abdelaziz Jouaiti ₂ , Nathalie Gruber ₂ , Géraud Delport ₃ , Gaëlle Trippé-Allard ₁ , Jean-François Guillemoles ₃ , Emmanuelle Deleporte ₁ , Sylvie Ferlay ₂ , Damien Garrot ₄

Affiliation

We report on a series of low dimensional 1D enantiomerically pure and racemic lead bromide perovskite compounds of the formula BuA-PbBr₃, MBA-PbBr₃ and EBA-PbBr₃ (BuA, cation derived from 2-Butylamine, MBA from Methylbenzylamine and EBA from α-Ethylbenzylamine) incorporating monovalent chiral ammonium derivative cations. A series of 6 enantiomerically pure compounds is described. The compounds are fully characterized from a structural point of view using X-Ray diffraction on single crystals and XRPD. Their photoluminescence emission properties have been carefully investigated. The use of cations of different sizes allows tuning the distances between the inorganic one-dimensional (1D) chains. All compounds show broadband below-bandgap emission, attributed to Self-Trapped Exciton (STE) recombination. The photoluminescence is characterized by a significant degree of linear polarization at room temperature, which can be explained by the structural anisotropy of the transition dipole moments and quantum confinement of the excitons in the 1D material. Our results indicate that the described compounds are of high interest for linearly-polarized broadband light-emitting devices and demonstrate the possibility of engineering the crystalline structure by the appropriate choice of the organic cation.

中文翻译：

使用手性铵阳离子调节一维混合溴化铅钙钛矿的结构，在室温下实现线性偏振宽带光发射

我们报告了一系列低维一维对映体纯和外消旋溴化铅钙钛矿化合物，其分子式为BuA -PbBr ₃、MBA -PbBr ₃和EBA -PbBr ₃（BuA，阳离子衍生自 2-丁胺，MBA衍生自甲基苄胺和EBA来自α-乙基苄胺）并入一价手性铵衍生物阳离子。描述了一系列 6 种对映体纯的化合物。使用单晶 X 射线衍射和 XRPD 从结构角度对这些化合物进行了充分表征。已经仔细研究了它们的光致发光发射特性。使用不同尺寸的阳离子可以调节无机一维 (1D) 链之间的距离。由于自陷激子 (STE) 重组，所有化合物都显示出宽带低于带隙的发射。光致发光的特征在于室温下显着程度的线性偏振，这可以通过跃迁偶极矩的结构各向异性和一维材料中激子的量子限制来解释。

更新日期：2022-08-09

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