Vitrified Chiral−Nematic Liquid Crystalline Films for Selective Reflection and Circular Polarization

1999 ◽  
Vol 11 (6) ◽  
pp. 1590-1596 ◽  
Author(s):  
Dimitris Katsis ◽  
Philip H. M. Chen ◽  
John C. Mastrangelo ◽  
Shaw H. Chen ◽  
Thomas N. Blanton
Keyword(s):  
Circular Polarization ◽  
Liquid Crystalline ◽  
Selective Reflection ◽  
Chiral Nematic ◽  
Crystalline Films

scholarly journals Polarized Phosphorescence of Isotropic and Metal-Based Clustomesogens Dispersed into Chiral Nematic Liquid Crystalline Films

2015 ◽  
Vol 3 (10) ◽  
pp. 1368-1372 ◽  
Author(s):  
Simon M. Wood ◽  
Marianne Prévôt ◽  
Maria Amela-Cortes ◽  
Stéphane Cordier ◽  
Steve J. Elston ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Chiral Nematic ◽  
Crystalline Films

Circularly polarized fluorescence from chiral nematic liquid crystalline films: theory and experiment

1998 ◽  
Vol 24 (2) ◽  
pp. 163-172 ◽  
Author(s):  
HONGQIN SHI ◽  
BROOKE M. CONGER ◽  
DIMITRIS KATSIS ◽  
SHAW H. CHEN
Keyword(s):  
Liquid Crystalline ◽  
Polarized Fluorescence ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Crystalline Films ◽  
Theory And Experiment

Theory of Circularly Polarized Light Emission from Chiral Nematic Liquid Crystalline Films

1996 ◽  
Vol 425 ◽  
Author(s):  
H. Shi ◽  
S. H. Chen
Keyword(s):  
Experimental Data ◽  
Film Thickness ◽  
Liquid Crystalline ◽  
Light Emission ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Polarized Emission ◽  
Crystalline Films

AbstractChiral nematic liquid crystalline films with fluorescent chromophores are capable of circularly polarized emission. A theory is presented in which the effects of anisotropic absorption and film thickness are accounted for. The predicted dissymmetry factor is compared with experimental data reported by Stegemeyer et al. and with the theory for the two limiting cases treated by Pollmann et al.

Study on selective reflection properties of chiral nematic liquid crystalline composites with a non‐uniform pitch distribution

2008 ◽  
Vol 35 (11) ◽  
pp. 1313-1320 ◽  
Author(s):  
Wei Huang ◽  
Zhenyu Bian ◽  
Kexuan Li ◽  
Jiumei Xiao ◽  
Hui Cao ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Selective Reflection ◽  
Chiral Nematic

Characteristics of selective reflection of chiral nematic liquid crystalline gels with a nonuniform pitch distribution

2007 ◽  
Vol 91 (20) ◽  
pp. 201908 ◽  
Author(s):  
Zhenyu Bian ◽  
Kexuan Li ◽  
Wei Huang ◽  
Hui Cao ◽  
Huai Yang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Selective Reflection ◽  
Chiral Nematic

Cholesteric copolymers and mixtures containing dithienylethene photochromic fragments

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Dasha Semenova ◽  
Alexey Bobrovsky ◽  
Natalia Boiko ◽  
Valery Shibaev ◽  
Igor Zavarzin ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Phase Behaviour ◽  
Light Reflection ◽  
Polymeric Liquid ◽  
Selective Reflection ◽  
Near Ir ◽  
Crystalline Films ◽  
Influence Of Temperature On ◽  
Absorbance Peak ◽  
And Storage

Abstract The phase behaviour and optical properties of mixtures based on cholesteric copolymers with 3 - 6 wt.-% of photochromic dithienylethene dopants as well as a cholesteric copolymer containing dithienylethene side groups were studied. It was shown that planar-oriented films of the mixtures and of the copolymer possess a selective light reflection in the visible or near IR regions of the spectrum. UV irradiation of the mixture films leads to the appearance of an intense absorbance peak in the spectral range coinciding with the selective reflection band (λmax ≈ 522 - 615 nm depending on the chemical structure of the photochromic fragment). This process is associated with the photocyclization of dopants and photochromic side groups and the ‘degeneration’ of the selective light reflection. The photoinduced coloured form of dopants and photochromic side groups is thermally stable at room temperature, but subsequent irradiation of the film by visible light (550 or 633 nm) induces a decoloration process. The influence of temperature on the rates of forward and back photoprocesses in such polymeric liquid crystalline films was studied. The potentialities of the use of such type of materials for reversible data recording and storage were demonstrated.

Polarized Fluorescence from Vitrified Liquid Crystalline Films

1996 ◽  
Vol 425 ◽  
Author(s):  
Brooke M. Conger ◽  
H. Shi ◽  
S. H. Chen ◽  
T. Tsutsui
Keyword(s):  
Liquid Crystal ◽  
Linear Polarization ◽  
Order Parameter ◽  
Liquid Crystalline ◽  
Emission Spectra ◽  
Polarized Fluorescence ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Polarization Factor ◽  
Crystalline Films

AbstractLinearly and circularly polarized photoluminescence (PL) were observed from neat vitrified liquid crystal (LC) films. Electronic properties of the compounds were investigated through measurement of absorption and emission spectra in solution and in film. The nematic film exhibited a polarization factor (linear polarization) of 2.8 at an order parameter of 0.70, whereas the chiral nematic film gave rise to an absolute dissymmetry factor (circular polarization) of 0.27 at an order parameter of 0.54.

scholarly journals Concentric chiral nematic polymeric fibers from cellulose nanocrystals

2021 ◽  
Author(s):  
Arash Momeni ◽  
Christopher M. Walters ◽  
Yi-Tao Xu ◽  
Wadood Y. Hamad ◽  
Mark J. MacLachlan
Keyword(s):  
Cellulose Nanocrystals ◽  
Liquid Crystalline ◽  
Capillary Tube ◽  
Single Domain ◽  
Cellulose Nanocrystal ◽  
Polymeric Fibers ◽  
Chiral Nematic ◽  
Chiral Nematic Structure ◽  
Crystalline Suspension

A cellulose nanocrystal liquid crystalline suspension was mixed with monomers and confined to a capillary tube. After photopolymerization, a fiber with a single-domain concentric chiral nematic structure throughout the length of the fiber was obtained.

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