Volume 60, Issue 39 pp. 21434-21440
Research Article

Tuning the Circular Dichroism and Circular Polarized Luminescence Intensities of Chiral 2D Hybrid Organic–Inorganic Perovskites through Halogenation of the Organic Ions

Jin-Tai Lin

Jin-Tai Lin

Department of Chemistry, National Taiwan University, Taipei, 10617 Taiwan

These authors contributed equally to this work.

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Deng-Gao Chen

Deng-Gao Chen

Department of Chemistry, National Taiwan University, Taipei, 10617 Taiwan

These authors contributed equally to this work.

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Lan-Sheng Yang

Lan-Sheng Yang

Department of Physics, National Taiwan Normal University, Taipei, 116 Taiwan

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Tai-Chun Lin

Tai-Chun Lin

Department of Chemistry, National Taiwan University, Taipei, 10617 Taiwan

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Yi-Hung Liu

Yi-Hung Liu

Instrumentation Center, National Taiwan University, Taipei, 10617 Taiwan

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Yu-Chiang Chao

Corresponding Author

Yu-Chiang Chao

Department of Physics, National Taiwan Normal University, Taipei, 116 Taiwan

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Pi-Tai Chou

Corresponding Author

Pi-Tai Chou

Department of Chemistry, National Taiwan University, Taipei, 10617 Taiwan

Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617 Taiwan

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Ching-Wen Chiu

Corresponding Author

Ching-Wen Chiu

Department of Chemistry, National Taiwan University, Taipei, 10617 Taiwan

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First published: 28 July 2021
Citations: 136

Graphical Abstract

Through the incorporation of Cl-substituted chiral organic cations, the chiroptical properties of 2D chiral perovskites can be significantly enhanced. The observed circular dichroism and circular polarized luminescence intensities are found to be associated with the d-spacing of hybrid organic–inorganic perovskites and the strength of the halogen–halogen interaction within the system.

Abstract

Through the incorporation of various halogen-substituted chiral organic cations, the effects of chiral molecules on the chiroptical properties of hybrid organic–inorganic perovskites (HOIPs) are investigated. Among them, the HOIP having a Cl-substituted chiral cation exhibits the highest circular dichroism (CD) and circular polarized luminescence (CPL) intensities, indicating the existence of the largest rotatory strength, whereas the F-substituted HIOP shows the weakest intensities. The observed modulation can be correlated to the varied magnetic transition dipole of HOIPs, which is sensitive to the d-spacing between inorganic layers and the halogen–halogen interaction between organic cations and the inorganic sheets. These counteracting effects meet the optimal CD and CPL intensity with chlorine substitution, rendering the rotatory strength of HOIPs arranged in the order of (ClMBA)2PbI4>(BrMBA)2PbI4>(IMBA)2PbI4>(MBA)2PbI4>(FMBA)2PbI4.

Conflict of interest

The authors declare no conflict of interest.

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