Electric‐field controlled color effect in cholesteric liquid crystals and polymer‐dispersed cholesteric liquid crystals

1996 ◽  
Vol 80 (3) ◽  
pp. 1907-1909 ◽  
Author(s):  
Gouram Chilaya ◽  
Gerd Hauck ◽  
Hans Dieter Koswig ◽  
David Sikharulidze
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Cholesteric Liquid Crystals ◽  
Color Effect ◽  
Polymer Dispersed

Chromaticity of polymer-dispersed cholesteric liquid crystals

1992 ◽  
Vol 12 (1) ◽  
pp. 49-58 ◽  
Author(s):  
H.-S. Kitzerow ◽  
P. P. Crooker ◽  
G. Heppke
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Polymer Dispersed

Voltage-Induced Cholesteric Structure-Transformation in Thin Layers

1981 ◽  
Vol 36 (7) ◽  
pp. 718-726 ◽  
Author(s):  
Paul R. Gerber
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Thin Layers ◽  
Dielectric Anisotropy ◽  
Structure Transformation ◽  
Cholesteric Liquid Crystals ◽  
Threshold Voltages

Abstract o lta g e -In d u c e d C h o le s te r ic S tr u c tu r e -T r a n s f o r m a tio n in T h i n L a y e rs Measurements of various threshold voltages which occur in thin layers of cholesteric liquid crystals with positive dielectric anisotropy under homeotropic wall-alignment conditions are presented. Characteristic times are determined for some of the structure-changing processes which take place under application of electric-field changes. The measurements have been performed for various pitch-to-thickness ratios, and are expressed in empirical formulae.

Strong CPL of achiral liquid crystal fluorescent polymer via the regulation of AIE-active chiral dopant

2020 ◽  
Vol 56 (84) ◽  
pp. 12829-12832
Author(s):  
Kerui Liu ◽  
Yihao Shen ◽  
Xiaojing Li ◽  
Yu Zhang ◽  
Yiwu Quan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
New Strategy ◽  
Polymer Dispersed ◽  
Fluorescent Polymer ◽  
Ternary Polymer

Strong CPL induced by ternary polymer dispersed cholesteric liquid crystals (PD-CLCs) can deliver a new strategy for designing excellent CPL materials.

Electrically switchable reflection gratings in polymer dispersed liquid crystals

1999 ◽  
Vol 559 ◽  
Author(s):  
L. V. Natarajan ◽  
R. L. Sutherland ◽  
V. P. Tondiglia ◽  
S. Siwecki ◽  
R. Pogue ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Field ◽  
Low Voltage ◽  
Blue Shift ◽  
Maximum Efficiency ◽  
Acrylate Monomer ◽  
Polymer Dispersed ◽  
Reflection Gratings ◽  
Grating Formation

ABSTRACTElectrically switchable volume reflection holograms were written by inhomogeneous illumination of a prepolymer syrup containing a nematic liquid crystal and a multifunctional acrylate monomer. Switchable holograms are diffractive optics structures and the diffraction efficiency can be controlled by the application of an electric field. Reflection gratings with grating spacing varying between 0.16-0.27 µm were made during the phase separation of liquid crystals from the fast curing prepolymer syrup. The reflection efficiency of the holograms were electrically modulated with the applied field of ∼10-15V/µm. Real time study of the grating formation revealed that the maximum efficiency is reached in ∼15 seconds. The shrinkage of the host polymer during grating formation resulted in the blue shift of the reflection notch. The response time of the grating in an electric field is ∼50 µs. Low voltage scanning electron microscope studies showed the presence of discrete nematic droplet domains of sizes 30-60 nm in liquid crystal rich region.

Electric-Field-Induced Phase Change in Cholesteric Liquid Crystals

1968 ◽  
Vol 20 (19) ◽  
pp. 1024-1025 ◽  
Author(s):  
J. J. Wysocki ◽  
J. Adams ◽  
W. Haas
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Phase Change ◽  
Cholesteric Liquid Crystals
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