Circularly Polarized Light‐Driven Supramolecular Chirality

This paper describes the synthesis, thermal characterization and optical properties of liquid crystalline homopolymers and block copolymers with a repeating unit consisting of two functional units, with at least one of them being an azobenzene. Films of these polymers have been irradiated with circularly polarized light at room temperature, evaluating the intensity of the photoinduced chiral signal and its temporal stability upon storage. The paper also explores two different strategies to restrict the relaxation of the photoinduced order. Firstly, block copolymers have been prepared to confine the photoaddressable segments into nanoscopic domains where relaxation should be restricted. Secondly, an alternative homopolymer has been synthesized where the repeating unit combines two chromophores that can be separately photoaddressed, an azobenzene unit to efficiently photoinduce chirality and a cinnamate to fix the chiral signal by photocrosslinking.

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Building Supramolecular Chirality in Organic Solar Cells Enables High-Performing Circularly Polarized Light Detection

10.21203/rs.3.rs-39893/v1 ◽

2020 ◽

Author(s):

Lixuan Liu ◽

Yang Yang ◽

Jianqi Zhang ◽

Waqar Memon ◽

Yajie Zhang ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Short Circuit ◽

Polarized Light ◽

Short Circuit Current ◽

Circularly Polarized Light ◽

Circularly Polarized ◽

High Performing ◽

Supramolecular Chirality ◽

Significant Difference

Abstract High-performing direct circularly polarized light (CPL) detectors are urgently needed for the development of chiral optoelectronics. We herein report the direct CPL detectors based on chiral organic small-molecule donor–fullerene acceptor bulk heterojunction organic solar cells (OSCs). By building supramolecular chirality in active layer of OSCs, the chiral OSC demonstrates its highest short-circuit current dissymmetry factor of 0.17 among state-of-the-art direct CPL detectors possessing intrinsic chirality. It demonstrates a significant difference in responsivity of 40 mA W− 1 upon opposite CPL illumination, four times higher than that of the best reported chiral perovskite CPL detectors to date. The association between the device metrics crucially relating to CPL detection and the anisotropic factor (g-factor) of the active layers revealed that supramolecular chirality is vital to the CPL detectability of OSCs. Given unique but ubiquitous observed supramolecular chirality induction and transfer in organic conjugated systems, highly sensitive CPL detectors based on chiral OSCs show great potential for promoting the development of practical direct CPL detection.

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Differential polarization imaging of sickled cells

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100102390 ◽

1988 ◽

Vol 46 ◽

pp. 62-63

Author(s):

Marcos F. Maestre

Keyword(s):

Optical Properties ◽

Theoretical Approach ◽

Polarized Light ◽

Polarization Microscopy ◽

Spectroscopic Techniques ◽

Polarization Imaging ◽

Circularly Polarized Light ◽

Circularly Polarized ◽

Microscopic Scale ◽

Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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Faculty Opinions recommendation of Non-racemic amino acid production by ultraviolet irradiation of achiral interstellar ice analogs with circularly polarized light.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.8329957.8916055 ◽

2011 ◽

Author(s):

Niles Lehman ◽

Aaron Burton

Keyword(s):

Amino Acid ◽

Ultraviolet Irradiation ◽

Acid Production ◽

Polarized Light ◽

Amino Acid Production ◽

Circularly Polarized Light ◽

Circularly Polarized ◽

Interstellar Ice ◽

Racemic Amino Acid

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Blue Circularly Polarized Luminescent Amorphous Molecules with Single-handed Propeller Chirality Induced by Circularly Polarized Light Irradiation

Chemical Communications ◽

10.1039/d0cc07898k ◽

2021 ◽

Author(s):

Zhaoming Zhang ◽

Takunori Harada ◽

Adriana Pietropaolo ◽

Yuting Wang ◽

Yue Wang ◽

...

Keyword(s):

Polarized Light ◽

Light Irradiation ◽

Circularly Polarized Light ◽

Circularly Polarized ◽

Trigonal Symmetry ◽

Circularly Polarized Luminescence ◽

Polarized Luminescence

Preferred-handed propeller conformation was induced by circularly polarized light irradiation to three amorphous molecules with trigonal symmetry, and the molecules with induced chirality efficiently exhibited blue circularly polarized luminescence. In...

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