Ultraviolet Circularly Polarized Luminescence in Chiral Perovskite Nanoplatelet-Molecular Hybrids: Direct Binding Versus Efficient Triplet Energy Transfer

Bing Tang, Qi Wei, Shixun Wang, Haochen Liu, Nanli Mou, Qi Liu, Ye Wu, Arsenii S. Portniagin, Stephen V. Kershaw, Xiaoqing Gao, Mingjie Li, Andrey L. Rogach

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The development of ultraviolet circularly polarized light (UVCPL) sources has the potential to benefit plenty of practical applications but remains a challenge due to limitations in available material systems and a limited understanding of the excited state chirality transfer. Herein, by constructing hybrid structures of the chiral perovskite CsPbBr3 nanoplatelets and organic molecules, excited state chirality transfer is achieved, either via direct binding or triplet energy transfer, leading to efficient UVCPL emission. The underlying photophysical mechanisms of these two scenarios are clarified by comprehensive optical studies. Intriguingly, UVCPL realized via the triple energy transfer, followed by the triplet–triplet annihilation upconversion processes, demonstrates a 50-fold enhanced dissymmetry factor glum. Furthermore, stereoselective photopolymerization of diacetylene monomer is demonstrated by using such efficient UVCPL. This study provides both novel insights and a practical approach for realizing UVCPL, which can also be extended to other material systems and spectral regions, such as visible and near-infrared.

Original languageEnglish
Article number2311639
JournalSmall
DOIs
Publication statusPublished - 10 Jan 2024

Keywords

  • chirality transfer
  • metal halide perovskite nanoplatelets
  • nanocrystal-molecular hybrids
  • triplet energy transfer
  • UV circularly polarized luminescence

ASJC Scopus subject areas

  • Biotechnology
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Engineering (miscellaneous)

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