scholarly journals Luminescence Tuning of Fluorinated Bistolanes via Electronic or Aggregated-Structure Control

2019 ◽  
Vol 9 (9) ◽  
pp. 1905 ◽  
Author(s):  
Masato Morita ◽  
Shigeyuki Yamada ◽  
Tomohiro Agou ◽  
Toshio Kubota ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Liquid Crystalline ◽  
Molecular Design ◽  
Thermal Conditions ◽  
Light Emitting ◽  
Practical Applications ◽  
Precise Control ◽  
Structure Control ◽  
Wide Range ◽  
External Stimuli

Organic luminescent materials have a wide range of practical applications, but the understanding of the relationship between molecular structure and luminescent behavior is lacking. Herein, we synthesized fluorinated bistolanes with an electron-donating alkoxy substituent at one terminal and an electron-withdrawing substituent at the other to realize systematic control of the electron-density distribution. Evaluation of the phase transition behavior revealed that most of the fluorinated bistolanes showed liquid-crystalline (LC) behavior, with the phase transition temperature depending on the terminal substituents. Additionally, the fluorinated luminophores displayed intense photoluminescence (PL) in solution and in their crystal phases. Remarkably, the PL color shifted dramatically depending on the dipole moment (μ||) along the long molecular axis; thus, PL tuning can be achieved through electronic modulation by precise control of the μ|| of the luminophore. Interestingly, in the LC phases under thermal conditions, the maximum PL band shifted by 0.210 eV upon phase transition from the crystal to smectic A LC phases, indicating that PL tuning can also be achieved by controlling the aggregated structure. These results offer a new molecular design for easily tunable PL materials using the molecular properties or external stimuli for promising applications, including light-emitting displays and PL sensing materials.

scholarly journals Correction: Self-assembled blue-light emitting materials for their liquid crystalline and OLED applications: from a simple molecular design to supramolecular materials

2021 ◽  
Author(s):  
Vinay S. Sharma ◽  
Anuj S. Sharma ◽  
Nikhil K. Agarwal ◽  
Priyanka A. Shah ◽  
Pranav S. Shrivastav
Keyword(s):  
Blue Light ◽  
Liquid Crystalline ◽  
Molecular Design ◽  
Supramolecular Materials ◽  
Light Emitting ◽  
Self Assembled

Correction for ‘Self-assembled blue-light emitting materials for their liquid crystalline and OLED applications: from a simple molecular design to supramolecular materials’ by Vinay S. Sharma et al., Mol. Syst. Des. Eng., 2020, 5, 1691–1705, DOI: 10.1039/D0ME00117A.

Development of light-emitting liquid-crystalline polymers with a pentafluorinated bistolane-based luminophore

2020 ◽  
Vol 44 (15) ◽  
pp. 5684-5691 ◽  
Author(s):  
Shigeyuki Yamada ◽  
Akira Mitsuda ◽  
Kaoru Adachi ◽  
Mitsuo Hara ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Liquid Crystalline ◽  
Dynamic Change ◽  
Liquid Crystalline Polymers ◽  
Light Emitting ◽  
Light Blue ◽  
Crystalline Polymers ◽  
Thermal Phase Transition ◽  
Thermal Phase

Light-emitting liquid-crystalline polymers showing PL in the pristine solid state can control their PL color from blue to light-blue via a thermal phase transition to LC phases, which originates from a dynamic change of aggregated structures.

scholarly journals Polysiloxane-Based Side Chain Liquid Crystal Polymers: From Synthesis to Structure–Phase Transition Behavior Relationships

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 794 ◽  
Author(s):  
Lanying Zhang ◽  
Wenhuan Yao ◽  
Yanzi Gao ◽  
Cuihong Zhang ◽  
Huai Yang
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Molecular Design ◽  
Molecular Structures ◽  
Polymer Materials ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Thermal Stabilities ◽  
Structure Phase Transition

Organosilicon polymer materials play an important role in certain applications due to characteristics of much lower glass transition temperatures (Tg), viscosities, surface energy, as well as good mechanical, thermal stabilities, and insulation performance stemming from the higher bond energy and the larger bond angles of the adjacent silicon-oxygen bond. This critical review highlights developments in the synthesis, structure, and phase transition behaviors of polysiloxane-based side chain liquid crystal polymers (PSCLCPs) of linear and cyclic polysiloxanes containing homopolymers and copolymers. Detailed synthetic strategies are elaborated, and the relationship between molecular structures and liquid crystalline phase transition behaviors is systematically discussed, providing theoretical guidance on the molecular design of the materials.

Self-assembled blue-light emitting materials for their liquid crystalline and OLED applications: from a simple molecular design to supramolecular materials

2020 ◽  
Vol 5 (10) ◽  
pp. 1691-1705
Author(s):  
Vinay S. Sharma ◽  
Anuj S. Sharma ◽  
Nikhil K. Agarwal ◽  
Priyanka A. Shah ◽  
Pranav S. Shrivastav
Keyword(s):  
Liquid Crystals ◽  
Blue Light ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Molecular Design ◽  
Supramolecular Materials ◽  
Light Emitting ◽  
New Family ◽  
Self Assembled

A new family of blue-light-emitting supramolecular bowl-shaped columnar hexagonal liquid crystals based on p-tert-butylcalix[4]arene and functionalized via chalconyl–ester-linked biphenyl amine derivatives form a self-assembly and their applications.

scholarly journals Liquid Crystalline Copolymers Containing Sulfonic and Light-Responsive Groups: From Molecular Design to Conductivity

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2579
Author(s):  
Sakinah Mohd Alauddin ◽  
Nurul Fadhilah Kamalul Aripin ◽  
Thamil Selvi Velayutham ◽  
Alfonso Martinez-Felipe
Keyword(s):  
Liquid Crystalline ◽  
Molecular Design ◽  
Crystalline Materials ◽  
Structural Characterisation ◽  
Monomer Composition ◽  
Smectic Phases ◽  
Reversible Addition ◽  
Energy Conversion And Storage ◽  
Liquid Crystalline Materials ◽  
External Stimuli

In the search for novel smart multifunctional liquid crystalline materials, we report the synthesis, thermal and structural characterisation, and the conductivity, of a set of new block and statistical copolymers, containing light-responsive mesogenic groups (MeOAzB), polar sulfonic acids (AMPS), and methyl(methacrylate) groups (MMA). By using a cascade of reversible addition-fragmentation chain polymerisations, RAFT, we have tailored different side-chain polymeric structures by controlling monomer composition (MeOAzB/AMPS/MMA) and configuration. We have yielded simultaneous liquid crystalline behaviour and appreciable conductivity in polymers with low concentrations of polar acid groups, by the formation of smectic phases in narrow aggregates. The light-responsiveness of the polymers, via reversible trans-to-cis photoisomerization of azobenzene groups, and the local activation of conductivity at relatively low temperatures, opens the possibility to prepare polymer electrolytes for energy conversion and storage, whose conductivity could be controlled and optimised by external stimuli, including light irradiation.

scholarly journals 2-Chloroalkoxy-Substituted Pentafluorinated Bistolanes as Novel Light-Emitting Liquid Crystals

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 195 ◽  
Author(s):  
Shigeyuki Yamada ◽  
Kazuya Miyano ◽  
Tomohiro Agou ◽  
Toshio Kubota ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Valuable Insight ◽  
The Novel ◽  
Light Emitting ◽  
Heating And Cooling ◽  
Chiral Nematic ◽  
Blue Phase ◽  
Insight Into

In this study, we designed and synthesized novel pentafluorinated bistolane derivatives with 2-chloropentyl or 2-chlorohexyl flexible units as novel light-emitting liquid crystals (LELCs). By measuring the phase-transition behaviors, all derivatives were found to display liquid-crystalline (LC) phases during both heating and cooling processes. Among the novel bistolanes, the S- and R-configured derivatives exhibited a chiral nematic (N*) phase with a typical Grandjean optical texture. Interestingly, the chiral derivatives also exhibited a blue phase with a typical platelet texture in a narrow temperature range (2–4 °C). Photophysical measurements revealed that the 2-chloroalkoxy-substituted pentafluorinated bistolanes exhibited intense photoluminescence (PL) both in solution and in crystalline phases. The PL characteristics, especially the maximum PL wavelength, were found to switch sensitively during the heating and cooling cycles depending on the molecular aggregates through the crystal (Cr) ⇄ N* phase transition. The 2-chloroalkoxy flexible units induced dynamic changes in the LC and PL properties, providing valuable insight into the potential of various LELCs as PL sensing materials.

A “Simple” Donor-Acceptor AIEgen with Multi-Stimuli Responsive Behavior

2019 ◽  
Author(s):  
Jing Zhang ◽  
Aisen Li ◽  
hang zou ◽  
Peng Junhui ◽  
Jiali Guo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Smart Materials ◽  
Color Change ◽  
Molecular Design ◽  
Real Life ◽  
Transfer Property ◽  
Diverse Range ◽  
Practical Applications ◽  
Wide Range ◽  
Donor Acceptor

<p><a>At present, there is still an</a><a> urgent demand for novel smart materials</a> that can achieve a diverse range of practical applications in synthetic material area. Herein, we developed a simple but versatil<a>e aggregation-induced emission luminogen (<b>1</b>) with a donor-acceptor structure and pronounced intramolecular charge transfer property.</a><a> Compound <b>1</b> showed a </a>remarkable color change in sensitive response to polarity change making it to serve as a promising imaging probe for detecting environmental polarity in cells and selective visualization of lipid droplets in live tissues. Additionally, this compound exhibited a wide range of thermoresponsive behavior<a> with </a>ratiometric luminescence change and noticeable fluorescence color switching. It also can respond to anisotropic shearing force and isotropic hydrostatic pressure with prominent but contrast luminescence conversion due to the distinct disturbance of the weak intermolecular interactions and charge transfer processes. Meanwhile, compound <b>1</b> was sensitive to external electric stimulus and displayed reversibly three-color switched electrochromism and on-to-off electroluminochromism. Such property allowed the fabrication of high-performance non-doped OLED with a high external quantum efficiency of 5.22%. The present results may offer an important guideline for multifunctional molecular design and provide an important step forward to expand the real-life applications of AIE-active smart materials.</p>

A “Simple” Donor-Acceptor AIEgen with Multi-Stimuli Responsive Behavior

2019 ◽  
Author(s):  
Jing Zhang ◽  
Aisen Li ◽  
hang zou ◽  
Peng Junhui ◽  
Jiali Guo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Smart Materials ◽  
Color Change ◽  
Molecular Design ◽  
Real Life ◽  
Transfer Property ◽  
Diverse Range ◽  
Practical Applications ◽  
Wide Range ◽  
Donor Acceptor

<p><a>At present, there is still an</a><a> urgent demand for novel smart materials</a> that can achieve a diverse range of practical applications in synthetic material area. Herein, we developed a simple but versatil<a>e aggregation-induced emission luminogen (<b>1</b>) with a donor-acceptor structure and pronounced intramolecular charge transfer property.</a><a> Compound <b>1</b> showed a </a>remarkable color change in sensitive response to polarity change making it to serve as a promising imaging probe for detecting environmental polarity in cells and selective visualization of lipid droplets in live tissues. Additionally, this compound exhibited a wide range of thermoresponsive behavior<a> with </a>ratiometric luminescence change and noticeable fluorescence color switching. It also can respond to anisotropic shearing force and isotropic hydrostatic pressure with prominent but contrast luminescence conversion due to the distinct disturbance of the weak intermolecular interactions and charge transfer processes. Meanwhile, compound <b>1</b> was sensitive to external electric stimulus and displayed reversibly three-color switched electrochromism and on-to-off electroluminochromism. Such property allowed the fabrication of high-performance non-doped OLED with a high external quantum efficiency of 5.22%. The present results may offer an important guideline for multifunctional molecular design and provide an important step forward to expand the real-life applications of AIE-active smart materials.</p>

scholarly journals A systematic review on 1,8-naphthalimide derivatives as emissive materials in organic light-emitting diodes

2022 ◽  
Author(s):  
Sneha Kagatikar ◽  
Dhanya Sunil
Keyword(s):  
High Performance ◽  
Molecular Design ◽  
Research Attention ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Wide Viewing Angle ◽  
Free Construction ◽  
Wide Range ◽  
Significant Research

AbstractOrganic light-emitting devices (OLEDs) have garnered significant research attention owing to their immense application prospects in leading technologies for full-color flat panel displays and eco-friendly solid-state lighting. They demonstrate exceptional features such as mercury-free construction, wide viewing angle, superior color quality and captivating flexibility. The requirements of light-emitting organic materials pertaining to high stability, lifetime and luminescence quantum yield, combined with the fabrication of devices with high performance efficiency, are highly challenging. Rational molecular design of 1,8-naphthalimide (NI) derivatives can offer quite promising results in achieving standard-light-emitting materials with a wide range of colors for OLED applications. This review is mainly focused on the synthesis and usage of varyingly substituted NI frameworks as luminescent host, dopant, hole-blocking and electron-transporting materials for OLEDs that emit not only red, orange, green and blue colors, but also function as white emitters, which can really have an impact on reducing the energy consumption. The future prospects that could be explored to improve the research in the highly promising field of OLEDs are also discussed. Graphical abstract

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