Photo-Induced Diffusion in Polymerizing Chiral-Nematic Media

Broer, Dirk J.; Mol, Grietje N.; Haaren, Johannes A. M. M. van; Lub, Johan

doi:10.1002/(sici)1521-4095(199905)11:7<573::aid-adma573>3.3.co;2-5

Cited by 72 publications

(104 citation statements)

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“…By using acrylate-terminated LCs, it is possible to polymerize the LC by exposing it to ultraviolet light to form a thin solid film. 8 The optical features of the CLC are schematically depicted in Fig. 2͑a͒.…”

Section: Semitransparent Organic Solar Cells With Organic Wavelength mentioning

confidence: 99%

Semitransparent organic solar cells with organic wavelength dependent reflectors

Galagan

Debije

Blom

2011

Applied Physics Letters

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Semitransparent organic solar cells employing solution-processable organic wavelength dependent reflectors of chiral nematic (cholesteric) liquid crystals are demonstrated. The cholesteric liquid crystal (CLC) reflects only in a narrow band of the solar spectrum and remains transparent for the remaining wavelengths. The reflective band is matched to the absorption spectrum of the organic solar cell such that only unabsorbed photons that can contribute to the photocurrent are reflected to pass through the active layer a second time. In this way, the efficiency of semitransparent organic solar cells can be enhanced without significant transparency losses. An efficiency increase of 6% was observed when a CLC reflector with a reflection band of 540–620 nm was used, whereas the transparency of the organic solar cells is only suppressed in the 80 nm narrow bandwidth.

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Section: Semitransparent Organic Solar Cells With Organic Wavelength mentioning

confidence: 99%

Semitransparent organic solar cells with organic wavelength dependent reflectors

Galagan

Debije

Blom

2011

Applied Physics Letters

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“…Liquid crystalline phases can be classified into two classes: Lyotropic LC and Thermotropic LC [9]. The phase of lyotropic LC characteristic ordering depends on solvent [10]. While the phase of thermotropic LC characteristic ordering depends only on temperature [11], thermotropic LC phases are: nematic, smectic, and cholesteric [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, physical and biological properties of some cholesterol derivatives

2016

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A series of new cholesterol derivatives have been prepared via Mitsunobu reaction. The reaction was monitored by thin-layer chromatography (TLC) technique. All new compounds were characterized by melting points, elemental analysis, FT-IR, 1 H, 13 C and 2D-NMR spectroscopy. The antibacterial and antifungal activity of these derivatives was also determined. The phase transitions of the prepared derivatives were measured with the aid of differential scanning calorimetry. The textures of the mesophases have been determined with a hot stage equipped polarizing microscope, also the electrical conductivity of the solutions of these liquid crystals measured by electrical conductivity meter. The analysis showed that these prepared derivatives were liquid crystals.

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“…8,9 In most cases, negative photoresist materials were used based on reactive liquid crystalline (LC) monomers containing a dichroic photoinitiator. These rod-shaped initiators are capable to adapt to the molecular alignment of the LC monomer host.…”

Section: Introductionmentioning

confidence: 99%

Polarization-selective polymerization in a photo-crosslinking monomer film

et al. 2014

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The molecular order in a smectic monomer is utilized to create a photoreactive material that is highly polarization-selective during its photo-crosslinking polymerization. A dichroic photoinitiator adapts the molecular orientation of its aligned smectic B host monomer which reaches a degree of orientation larger than 0.9. This value correlates to a dichroic ratio, defined as the absorbance ratio of light with its polarization respectively parallel and perpendicular to the orientation axis, of 32. This is substantially higher than the dichroic ratio of similar dichroic initiators previously studied in nematic host monomers which considerably improves the polymerization contrast. The presence of an inhibitor, such as a hydroquinone, in the monomeric mixture enhances the polymerization contrast further. The effect of the inhibitor is due to the close to zero monomer to polymer conversion for the polarization perpendicular to the alignment in the initial stages of polymerization. It is argued that the high polarization-selectivity of the above-described system is potentially useful in nano and/or microstructuring techniques without the use of masks such as polarization holography.

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Photo-Induced Diffusion in Polymerizing Chiral-Nematic Media

Cited by 72 publications

References 0 publications

Semitransparent organic solar cells with organic wavelength dependent reflectors

Semitransparent organic solar cells with organic wavelength dependent reflectors

Synthesis, characterization, physical and biological properties of some cholesterol derivatives

Polarization-selective polymerization in a photo-crosslinking monomer film

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