Excitonic Circular Dichroism of Chiral Quantum Rods

Gao, Xiaoqing; Zhang, Xiuwen; Deng, Ke; Han, Bing; Zhao, Lei; Wu, Minghui; Shi, Lin; Lv, Jiawei; Tang, Zhiyong

doi:10.1021/jacs.7b04224

Cited by 126 publications

(160 citation statements)

References 47 publications

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“…The more recently developed method for fabrication of chiral QDs through postsynthesis ligand exchange, dramatically increased the ability to study induced chirality in shaped QDs and heterostructured QDs and extend the range of chiral ligands used in the process . These recent studies shed more light on the mechanisms underlying the induction of chirality …”

Section: Introductionmentioning

confidence: 99%

Chiral 2D Colloidal Semiconductor Quantum Wells

Yang

Kazes

Oron

2018

Adv Funct Materials

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Induced chirality in colloidal semiconductor nanoparticles has raised significant attention in the past few years as an extremely sensitive spectroscopic tool and due to the promising applications of chiral quantum dots in sensing, quantum optics, and spintronics. Yet, the origin of the induced chiroptical effects in semiconductor nanoparticles is still not fully understood, partly because almost all the theoretical and experimental studies to date are based on the simple model system of a spherical nanocrystal. Here, the realization of induced chirality in atomically flat 2D colloidal quantum wells is shown. A strong circular dichroism (CD) response as well as an absorptive-like CD line shape is observed in chiral CdSe nanoplatelets (NPLs), significantly differing from that previously observed in spherical dots. Furthermore, this intense CD signal almost completely disappears after coating with a very thin CdS shell. In contrast, CdSe-CdS core-crown NPLs exhibit a spectral response which seems to originate independently from the core and the crown regions of the NPL. This work on the one hand further advances the understanding of the fundamental origin of induced chiroptical effects in semiconductor nanoparticles, and on the other opens a pathway toward applications using chiroptical materials.

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Section: Introductionmentioning

confidence: 99%

Chiral 2D Colloidal Semiconductor Quantum Wells

Yang

Kazes

Oron

2018

Adv Funct Materials

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“…By controlling the morphology of QDs, Tang et al . showed the enhanced CD signal from wurtzite CdSe nanorods at certain aspect ratios, which was linked to the anisotropic coupling of the molecular dipole and the anisotropic dipole of the nanorods . As shown in Figure a, When the geometrical aspect ratio increased from 1.0 to 1.7, the CD intensity showed almost 10 times enhancement under the same absorption intensity, whereas with further increase of aspect ratio from 1.7 to 7.2, the CD intensity only slightly changed.…”

Section: Semiconductor Nanorods With Induced Circularly Polarized Lightmentioning

confidence: 89%

Multi‐Dimensional Quantum Nanostructures with Polarization Properties for Display Applications

Yang

Zhong

2019

Israel Journal of Chemistry

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Colloidal semiconductor nanocrystals (NCs), or quantum nanostructures with various dimensions and morphologies, are excellent emerging solution‐processable luminescent materials for display applications. The future of semiconductor NCs in the display market strongly relies on the development of low energy consuming devices. Replacing spherical NCs with multi‐dimensional nanostructures that emit linearly or circularly polarized light with high color purity and brightness, can significantly enhance the performance and efficiency of future display devices. In this review, we highlight some recent advances of colloidal syntheses of multi‐dimensional quantum nanostructures and their implementation as polarized light sources. The most representative examples are quasi‐one‐dimensional (q‐1D) CdSe/CdS dot‐in‐rods with strong linearly polarized emission for liquid crystal display technologies, and two‐dimensional (2D) nanoplatelets with enhanced circular dichroism signals as potential circularly polarized luminescence sources for electroluminescence applications.

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“…These chiral molecules and their mirror images (enantiomers) exhibit opposite handedness when interacting with circularly polarized light, as well as different chemical and biological performance. Inspired by chiral molecular structures, researchers are developing strategies to build artificial chiral materials by mimicking molecular structures using functional materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Specifically, metal nanomaterials exhibit tailorable optical properties upon excitation of surface plasmons and become one of the most promising components to realize of chiral optical metamaterials [15,16].…”

Section: Introductionmentioning

confidence: 99%

All-optical reconfigurable chiral meta-molecules

et al. 2019

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Chirality is a ubiquitous phenomenon in the natural world. Many biomolecules without inversion symmetry such as amino acids and sugars are chiral molecules. Measuring and controlling molecular chirality at a high precision down to the atomic scale are highly desired in physics, chemistry, biology, and medicine, however, have remained challenging. Herein, we achieve alloptical reconfigurable chiral meta-molecules experimentally using metallic and dielectric colloidal particles as artificial atoms or building blocks to serve at least two purposes. One is that the ondemand meta-molecules with strongly enhanced optical chirality are well-suited as substrates for surface-enhanced chiroptical spectroscopy of chiral molecules and as active components in optofluidic and nanophotonic devices. The other is that the bottom-up-assembled colloidal metamolecules provide microscopic models to better understand the origin of chirality in the actual atomic and molecular systems.

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Excitonic Circular Dichroism of Chiral Quantum Rods

Cited by 126 publications

References 47 publications

Chiral 2D Colloidal Semiconductor Quantum Wells

Chiral 2D Colloidal Semiconductor Quantum Wells

Multi‐Dimensional Quantum Nanostructures with Polarization Properties for Display Applications

All-optical reconfigurable chiral meta-molecules

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