scholarly journals Preparation of Polythiophene Films Showing Optical Activity by Electrochemical Polymerisation in Cholesteric Liquid Crystal Containing Coumarine

2015 ◽  
Vol 46 ◽  
pp. 42-47
Author(s):  
Hiroki Hayashi ◽  
Hiromasa Goto
Keyword(s):  
Cyclic Voltammetry ◽  
Liquid Crystal ◽  
Optical Absorption ◽  
Surface Morphology ◽  
Optical Microscopy ◽  
Polymer Film ◽  
Optical Activity ◽  
Electrolyte Solution ◽  
Cholesteric Liquid Crystal ◽  
Electrochemical Polymerisation

We carried out electrochemical polymerisation in a cholesteric liquid crystal electrolyte solution. The polymer film prepared in the cholesteric liquid crystal showed chiropticality even though its monomer is an achiral. The surface morphology of the polymer was observed with polarising optical microscopy. Optical and electric properties were examined by UV-vis optical absorption, circular dichroism spectroscopy, and cyclic voltammetry.

scholarly journals Synthesis of New Chiral Inducer and Preparation of Semi-Conducting Polymer Films Showing Fingerprint Structure

2014 ◽  
Vol 27 ◽  
pp. 6-12 ◽  
Author(s):  
Hiroki Hayashi ◽  
Kohsuke Kawabata ◽  
Hiromasa Goto
Keyword(s):  
Thin Film ◽  
Liquid Crystal ◽  
Surface Morphology ◽  
Optical Microscopy ◽  
Conducting Polymer ◽  
Electrolyte Solution ◽  
Cholesteric Liquid Crystal ◽  
Chiral Liquid Crystal ◽  
Conducting Polymer Films ◽  
Electrochemical Polymerisation

We synthesised a rod like shaped new chiral inducer to construct chiral liquid crystal electrolyte solution. Next, electrochemical polymerisation was carried out in the chiral liquid crystal electrolyte solution. The surface morphology of the polymers were observed with polarising optical microscopy. Synthesis of the new chiral inducer and preparation of semi-conducting thin film in the cholesteric liquid crystal electrolyte solution were performed.

scholarly journals Preparation of a Ferroelectric Liquid Crystal Electrolyte Solution

2015 ◽  
Vol 46 ◽  
pp. 1-8
Author(s):  
Tomonori Ito ◽  
Tomoaki Jo ◽  
Jiuchao Dong ◽  
Hitoshi Hayashi ◽  
Hiromasa Goto
Keyword(s):  
Liquid Crystal ◽  
Electrolyte Solution ◽  
Ferroelectric Liquid Crystal ◽  
Electrochemical Polymerisation

A ferroelectric liquid crystal was synthesised. We attempted electrochemical polymerisation in ferroelectric liquid crystal.

scholarly journals Enhancing the Efficiency of Color Conversion Micro-LED Display with a Patterned Cholesteric Liquid Crystal Polymer Film

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2430
Author(s):  
En-Lin Hsiang ◽  
Yannanqi Li ◽  
Ziqian He ◽  
Tao Zhan ◽  
Caicai Zhang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polymer Film ◽  
Blue Light ◽  
Conversion Efficiency ◽  
Cholesteric Liquid Crystal ◽  
Contrast Ratio ◽  
Blue Color ◽  
Color Gamut ◽  
Color Shift ◽  
Color Conversion

Color-converted micro-light-emitting diode (micro-LED) displays with wide color gamut, high ambient contrast ratio, and fast response time are emerging as a potentially disruptive technology. However, due to limited optical density and thickness of the color-conversion film, the blue light leakage and low color-conversion efficiency still hinder their widespread applications. In this paper, we demonstrate a patterned cholesteric liquid crystal (CLC) polymer film with two special optical functionalities. On the green and red sub-pixels, the corresponding planar CLC texture acts as a distributed Bragg reflector for the blue light, which in turn improves the color conversion efficiency and expands the color gamut. On the blue sub-pixels, the corresponding focal-conic CLC texture acts as light scattering medium, which helps to reduce the angular color shift. Further analysis reveals that the patterned CLC film can alleviate the crosstalk between green and blue color filters. Therefore, compared to the display system without such a CLC film, our proposed device structure increases the color conversion efficiency by 143% (at ~90% Rec. 2020) and reduces average angular color shift Δu’v’ from 0.03 to 0.018 at the viewing angle with the most severe color shift. Such a patterned CLC film is applicable to all kinds of color-conversion display systems, including organic and inorganic phosphors.

Influence of the alkyl radical on the optical activity of cholesteric liquid-crystal nanomaterials

2009 ◽  
Vol 29 (8) ◽  
pp. 794-798 ◽  
Author(s):  
V. I. Kolesnikov ◽  
S. F. Ermakov ◽  
A. P. Sychev ◽  
V. V. Mulyarchik
Keyword(s):  
Liquid Crystal ◽  
Optical Activity ◽  
Alkyl Radical ◽  
Cholesteric Liquid Crystal
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