Gigantic chiroptical enhancements in polyfluorene copolymers bearing bulky neomenthyl groups: importance of alternating sequences of chiral and achiral fluorene units

Watanabe, K.; Koyama, Yasuhito; Suzuki, Nozomu; Fujiki, Michiya; Nakano, Tamaki

doi:10.1039/c3py01442h

Cited by 38 publications

(31 citation statements)

References 43 publications

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“…With the growth of the length of oligomer chain, the g lum values increased . By using the similar strategy, a set of π‐conjugated polymers by introducing chiral side chains at the 9‐position of the fluorene moiety ( 141 – 145 ) were synthesized and found to exhibit strong circularly polarized emission . Among them, polyfluorene 141 displayed the intense optical activities with the absolute g lum values up to 0.25, which was attributed to the strong interchain interactions and different distances between the chiral center and the backbone.…”

Section: Conjugated Polymersmentioning

confidence: 99%

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Han

Guo

et al. 2018

Advanced Optical Materials

553

346

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Due to the characteristics of optical rotation, selective emission of polarized light, and circular dichroism, circularly polarized luminescent materials have aroused extensive attentions, and they have exhibited wide optoelectronic applications, such as optical data storage, liquid crystal display, and backlights in 3D displays. Here, the research progress of circularly polarized luminescent materials for organic optoelectronic devices is summarized. First, the definition and measurement of the circularly polarized light, such as optical rotatory dispersion, circular dichroism, and circularly polarized luminescence, are systematically introduced. Subsequently, the design strategies for various kinds of circularly polarized luminescent materials, including luminescent lanthanide and transition‐metal complexes, small organic luminophores, conjugated polymers, supramolecules, and liquid crystals are summarized. These materials exhibit circularly polarized luminescence with different magnitudes of luminescence dissymmetry values (glum). They are further applied in optoelectronic devices with excellent performance, and the influence factors on the glum values of these materials are presented in detail. Finally, the current opportunities and challenges in this rapidly growing research field are discussed systematically. The circularly polarized luminescent materials with large glum and high luminescence efficiency are very promising for applications in organic optoelectronic fields.

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Section: Conjugated Polymersmentioning

confidence: 99%

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Han

Guo

et al. 2018

Advanced Optical Materials

553

346

View full text Add to dashboard Cite

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“…We should note that the chiral signal we analyze does not require long‐range order as it is a bisignate Cotton‐effect arising from exciton coupling between chiral oriented chains. While perhaps strange at first sight, it has already been found in other systems that molecular imperfections (regio‐irregularity, achiral units, chiral additive), in chiral materials, can lead to an increase of the chiral expression …”

Section: Resultsmentioning

confidence: 99%

“…While perhaps strange at first sight, it has already been found in other systems that molecular imperfections (regio-irregularity, achiral units, chiral additive), in chiral materials, can lead to an increase of the chiral expression. [40][41][42][43]…”

Section: Cd-spectroscopymentioning

confidence: 99%

Influence of branching on the chiral self‐assembly of poly(phenylene ethynylene)

Steverlynck

Leysen

Koeckelberghs

2014

J. Polym. Sci. Part A: Polym. Chem.

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In this contribution, we report the synthesis of chiral all‐conjugated branched poly(phenylene ethynylenes) with a controlled amount of branching. Subsequently, the self‐assembly of these PPEs is studied by means of UV–vis, fluorescence spectroscopy, and DSC and the influence of branching is investigated. Finally, CD‐spectroscopy is used to study the influence of branching and self‐assembly on the chiral expression of these polymers. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 79–84

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“…This is related to a phenomenon, observed by our group and others, that the introduction of molecular disorder can improve the stacking properties of the material. [50][51][52][53] The absence or presence of fine structure (shoulder around 580 nm) in the 90% MeOH spectra can be understood in terms of the Table 2. Optical data for polymer series (P1/2/3-100) of branched poly(thiophenes) and for the copolymer series (P1-0/5/10/25/100).…”

Section: Uv-vis Spectramentioning

confidence: 99%

Strategies toward Controlling the Topology of Nonlinear Poly(thiophenes)

et al. 2016

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In this contribution, we report the synthesis of all-conjugated branched poly(thiophenes) with a control over the degree of nonlinearity via two different routes. In the first approach a branched monomer is polymerized using three different catalysts which differentiate in the degree of association to the π-system of the polymer backbone. In the second approach a copolymerization is performed with the branched and a linear monomer. In a next step the influence of the different degrees of nonlinearity on the optoelectronic properties are investigated by UV-vis and fluorescence spectroscopy. Finally, the thermal behavior, the morphology and the electrical properties at the nanoscale of the material in solid state is studied using DSC and AFM techniques, respectively.

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Gigantic chiroptical enhancements in polyfluorene copolymers bearing bulky neomenthyl groups: importance of alternating sequences of chiral and achiral fluorene units

Cited by 38 publications

References 43 publications

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Influence of branching on the chiral self‐assembly of poly(phenylene ethynylene)

Strategies toward Controlling the Topology of Nonlinear Poly(thiophenes)

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