Cellulose derivatives bearing pyrene-based π-conjugated pendants with circularly polarized luminescence in molecularly dispersed state

Ikai, Tomoyuki; Kojima, Yutaka; Shinohara, Ken‐ichi; Maeda, Katsuhiro; Kanoh, Shigeyoshi

doi:10.1016/j.polymer.2017.04.032

Cited by 27 publications

(15 citation statements)

References 30 publications

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“…Though the g lum values trend to decrease with the color of PA solutions changing from yellow to red, notably, the CPL performance is still located in the range of 10 −2 –10 −1 , even comparable to the reported best data in chiral polymers. [ 16–19,64–69 ]…”

Section: Resultsmentioning

confidence: 99%

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Zhao

Gao

Lü

et al. 2020

Advanced Optical Materials

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parameter for judging the material performance, [30] in which the maximum |g lum | value is 2 when absolutely left-handed or right-handed CPL emission is generated. Nevertheless, the |g lum | values of most reported CPL-active materials are mainly located between 10 −5 and 10 −2 , which are far from our expectation and cannot satisfy the demands for future applications. On the other hand, it is well-acknowledged that multicolor emissions especially RGB colors are important in display technology. Therefore, in consideration of the demands in practical applications, constructing CPL-active materials with both color-tunable emissions and high g lum values is of great significance. In the previous study, we have reported that chiral polyacetylenes with helical structures are good candidates for constructing CPL-active materials with high g lum values up to 10 −1. [31] Subsequently, we found that chiral helical polyacetylenes could serve as handedness-selective fluorescence filters to powerfully transform unpolarized fluorescent light into CPL emission. [32] Following this strategy, full-color and white-color CPL-active materials were easily constructed by combining chiral helical polyacetylenes with achiral fluorescence dyes. [32,33] Based on the above investigations, the relationship between helical structures and light shows unique charm and deserves more attention. The importance of such direction is more clearly demonstrated when considering the widespread helical structures and circularly polarized light in nature and living organisms. [34-38] In this contribution, we report our success in fabricating color-tunable CPL emissions by taking helical polyacetylenes as fluorescence converters. When blue-color circularly polarized light passes through the helical polyacetylenes with different conjugated lengths, multicolor CPL emissions of cyan, green, and orange are obtained, with high g lum values in the range of 10 −2-10 −1. It should be pointed out that, in spite of some publications concerning multicolor CPL materials reported by our group and others, [32,33,39-42] the multicolor CPLs therein are mainly realized from various fluorescent substances with different emission wavelength. In the present study, however, color-tunable CPL emissions are conveniently achieved from a single fluorescence substance, merely by tuning the conjugated length of helical polyacetylenes with commercial organic solvents. In particular notably, neither any covalent nor noncovalent interaction is required during the CPL color-tuning process, demonstrating the universality and superiority of the strategy established in the present work. Circularly polarized luminescence (CPL) materials are currently drawing rapidly increasing interest. However, constructing color-tunable CPL materials is still a big challenge, primarily due to the lack of simple, powerful, and universal preparation strategies. In this contribution, color-tunable CPL emissions are easily realized by taking helical polyacetylenes as fluorescence converters. The investigat...

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Section: Resultsmentioning

confidence: 99%

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Zhao

Gao

Lü

et al. 2020

Advanced Optical Materials

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“…Circularly polarized luminescence (CPL) materials have attracted a great deal of attention owing to their fascinating photophysical properties and potential applications in three‐dimensional (3D) display, data storage, optical sensing, etc [1–3] . The continuous hunt for new materials over recent years has resulted in an abundance of CPL materials, including lanthanide metal complexes, small organic molecules, π‐conjugated synthetic polymers, natural macromolecules, self‐assembled materials, and cholesteric liquid crystals (CLCs), i.e., self‐organized helical superstructures [4–9] . Among these materials, CLCs have a significant advantage for obtaining stimuli‐responsive CPL with a high emission dissymmetry factor ( g lum ).…”

Section: Introductionmentioning

confidence: 99%

Irradiation‐Wavelength Directing Circularly Polarized Luminescence in Self‐Organized Helical Superstructures Enabled by Hydrogen‐Bonded Chiral Fluorescent Molecular Switches

Zhang

Bisoyi

et al. 2021

Angew Chem Int Ed

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Two light‐driven chiral fluorescent molecular switches, (R,S,R)‐switch 1 and (R,S,R)‐switch 2, are prepared by means of hydrogen‐bonded (H‐bonded) assembly of a photoresponsive (S) chiral fluorescent molecule, respectively with a cyano substitution at different positions as an H‐bond acceptor and an opposite (R) chiral molecule as an H‐bond donor. The resulting two switches exhibit tunable and reversible Z/E photoisomerization irradiated with 450 nm blue and 365 nm UV light. When doped into an achiral liquid crystal, both switches are found to be able to form a CPL tunable luminescent helical superstructure. In contrast to the tunable CPL characteristics of the system incorporating switch 2, exposure of the system incorporating switch 1 to 365 nm and 450 nm radiation can lead to controllable different photostationary CPL behavior, including switching‐off and polarization inversion. In addition, optical information coding is demonstrated using the system containing switch 1.

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“…Figure b shows the variation in g Lum , plotted as a function of the emission wavelength for the C‐dot/CNC NP suspension after 6 h C‐dot synthesis, calculated from the spectra in Figure a. The value of the g Lum at 460 nm (the wavelength corresponding to the maximum emission intensity) was 0.2, that is, significantly higher than the reported values for dye/CNC hybrids, e.g., g Lum of 3.3 × 10 −2 for pyrene/CNC hybrid obtained by Ch induction . Notably, the value of g Lum at 460 nm for C‐dot/CNC suspension was as high as some of the highest values reported for the Ch‐CNC composite films obtained from mixtures of CNCs with NPs (−0.2) or dyes (−0.28) .…”

Section: Resultsmentioning

confidence: 74%

Chiral Carbon Dots Synthesized on Cellulose Nanocrystals

Chekini

Prince

Zhao

et al. 2019

Advanced Optical Materials

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Hybrid nanoparticles composed of cellulose nanocrystals (CNCs) and carbon‐dots (C‐dots) have promising applications in chemistry, biology, and nanomedicine, owing to the photoluminescence, sensory properties, and cytocompatibility of C‐dots, and chirality, cytobiocompatibility, and high cellular uptake of CNCs. The possibility of circularly polarized luminescence in such nanoparticles is particularly attractive. Herein, scalable and straightforward hydrothermal synthesis of nitrogen‐doped fluorescent C‐dots under reflux condition by using CNCs as a carbon source and chiral substrate is reported. Under ultraviolet irradiation, hybrid C‐dot/CNC nanoparticles exhibit stronger emission of left‐handed, than right‐handed, circularly polarized light, with high dissymmetry factor up to 0.2. The nanoparticles are biocompatible: the normalized proliferation index above 100% is determined for MCF 7 cells cultured in the suspension of C‐dot/CNC nanoparticles. These hybrid nanoparticles can find applications as biotags for labeling, sensing, and therapeutics and as building blocks of photoluminescent cholesteric CNC films with photonic applications.

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Cellulose derivatives bearing pyrene-based π-conjugated pendants with circularly polarized luminescence in molecularly dispersed state

Cited by 27 publications

References 30 publications

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Irradiation‐Wavelength Directing Circularly Polarized Luminescence in Self‐Organized Helical Superstructures Enabled by Hydrogen‐Bonded Chiral Fluorescent Molecular Switches

Chiral Carbon Dots Synthesized on Cellulose Nanocrystals

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