Hierarchical Chiral Self‐Assembly of Lead Halide Perovskite Nanocrystals by Oriented Phase Transition

Kang, Weiqiu; Gao, Xianhe; Li, Hongbo; Wei, Yang; Wang, Chao; Tian, Ziqi

doi:10.1002/adfm.202300388

Cited by 7 publications

(2 citation statements)

References 52 publications

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“…Actually, a very small amount of 0D impurity phase in 3D CsPbBr 3 phase has been proven to produce a slight fluorescence gain. [27][28][29] Figure 2c exhibits the morphology difference between the two kinds of CsPbBr 3 films. High crystallinity and high film coverage in the CsPbBr 3 film on hc-PEDOT:PSS substrate clearly show that the high curvature of the hc-PEDOT:PSS/PVK interface should indeed improve the crystallographic quality of CsPbBr 3 films.…”

Section: Resultsmentioning

confidence: 99%

High Curvature PEDOT:PSS Transport Layer Toward Enhanced Perovskite Light‐Emitting Diodes

Zeng

Wang

et al. 2023

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The rapidly developed metal halide perovskite light‐emitting diodes (PeLEDs) are considered as a promising candidate for next‐generation display and illumination, but the unbalanced charge transport is still a hard‐treat case to restrict its efficiency and operational stability. Here, a high curvature PEDOT:PSS transport layer is demonstrated via the self‐assembly island‐like structures by the incorporation of alkali metal salts. Benefiting from the dielectric confinement effect of the high curvature surface, the modified CsPbBr3‐based PeLEDs present a 2.1 times peak external quantum efficiency (EQE) from 6.75% to 14.23% and a 3.3 times half lifetime (T50) from 3.96 to 13.01 h. Besides, the PeLEDs show high luminance up to 44834 cd m−2. Evidently, this work may provide a deep insight into the structure‐activity relationship between the micro‐structures at the PEDOT:PSS/perovskite interface and the performance of PeLEDs, and crack the codes for ameliorating the performance of PeLEDs via interfacial micro‐structured regulation.

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Section: Resultsmentioning

confidence: 99%

High Curvature PEDOT:PSS Transport Layer Toward Enhanced Perovskite Light‐Emitting Diodes

Zeng

Wang

et al. 2023

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“…Furthermore, the designs and fabrication of the chiral assembly of PNCs remain challenging. Chiral assemblies are distinguished by their much larger scale than the individual building blocks and their more complex structures. − The construction of chiral assemblies can realize the transfer of chirality from molecules to large-scale structures . As a result, the assemblies have excellent chiral optical properties.…”

Section: Introductionmentioning

confidence: 99%

Chiral Assembly of Perovskite Nanocrystals: Sensitive Discrimination of Amino Acid Enantiomers

Liu,

Chai,

Huang

et al. 2024

Anal. Chem.

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Chirality is a widespread phenomenon in nature and in living organisms and plays an important role in living systems. The sensitive discrimination of chiral molecular enantiomers remains a challenge in the fields of chemistry and biology. Establishing a simple, fast, and efficient strategy to discriminate the spatial configuration of chiral molecular enantiomers is of great significance. Chiral perovskite nanocrystals (PNCs) have attracted much attention because of their excellent optical activity. However, it is a challenge to prepare perovskites with both chiral and fluorescence properties for chiral sensing. In this work, we synthesized two chiral fluorescent perovskite nanocrystal assembly (PNA) enantiomers by using L-or D-phenylalanine (Phe) as chiral ligands. PNA exhibited good fluorescence recognition for L-and D-proline (Pro). Homochiral interaction led to fluorescence enhancement, while heterochiral interaction led to fluorescence quenching, and there is a good linear relationship between the fluorescence changing rate and L-or D-Pro concentration. Mechanism studies show that homochiral interaction-induced fluorescence enhancement is attributed to the disassembly of chiral PNA, while no disassembly of chiral PNA was found in heterochiral interaction-induced fluorescence quenching, which is attributed to the substitution of Phe on the surface of chiral PNA by heterochiral Pro. This work suggests that chiral perovskite can be used for chiral fluorescence sensing; it will inspire the development of chiral nanomaterials and chiral optical sensors.

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Chiral Multidentate Ligand Facilitating Perovskite Nanocrystals with Circularly Polarized Luminescence and Chiral Assembly

Chen,

Fu,

Zhang

et al. 2024

Advanced Optical Materials

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Chiral ligand modification has emerged as a promising route to confer intrinsic chirality in perovskite nanocrystals (NCs), thereby imparting them with optically active properties and rendering great superiority in the next generation of circularly polarized luminescence. However, the functionalization of chiral ligand is not fully explored and the underlying mechanism governing chirality transfer remains elusive. Herein, tryptophan (Try), a naturally occurring chiral amino acid, is verified to serve as multidentate chiral ligands attaching on the surface of perovskite NCs. Such strong coordination favors the chirality imprinting on the electronic state of CsPbBr3, resulting in notable circular dichroism features and circularly polarized luminescence with a maximum glum of 2.3 × 10−3. It is intriguing that the intermolecular interaction between Try ligands anchored on two neighboring NCs contribute to chiral optical properties as well. The RDG‐NCI analysis have confirmed the hydrogen bond between the amine and carboxylic groups on chiral Try, which may drive the chiral assembly of perovskite NCs.

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Hierarchical Chiral Self‐Assembly of Lead Halide Perovskite Nanocrystals by Oriented Phase Transition

Cited by 7 publications

References 52 publications

High Curvature PEDOT:PSS Transport Layer Toward Enhanced Perovskite Light‐Emitting Diodes

High Curvature PEDOT:PSS Transport Layer Toward Enhanced Perovskite Light‐Emitting Diodes

Chiral Assembly of Perovskite Nanocrystals: Sensitive Discrimination of Amino Acid Enantiomers

Chiral Multidentate Ligand Facilitating Perovskite Nanocrystals with Circularly Polarized Luminescence and Chiral Assembly

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